From nobody Tue Jun 1 02:36:54 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 089303A0E17 for ; Tue, 1 Jun 2021 02:36:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c05VZcAivR_e for ; Tue, 1 Jun 2021 02:36:47 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 543423A0E1B for ; Tue, 1 Jun 2021 02:36:47 -0700 (PDT) Received: from [192.168.1.224] (90-231-104-158-no93.tbcn.telia.com [90.231.104.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 7247534860B for ; Tue, 1 Jun 2021 11:36:44 +0200 (CEST) To: "mpls@ietf.org" From: Loa Andersson Message-ID: Date: Tue, 1 Jun 2021 11:36:44 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Soliciting agenda items for the upcoming Open DT on Thursday (2021-06-03) X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Jun 2021 09:36:52 -0000 Design team, I have posted a very tentative agenda for the upcoming meeting: https://trac.ietf.org/trac/mpls/wiki/2021-06-03-agenda We are soliciting more agenda items, please send mail to the working group chairs. /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Tue Jun 1 15:55:12 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CB2BE3A2A89; Tue, 1 Jun 2021 15:55:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with 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id zMY5mCxpnqhM; Tue, 1 Jun 2021 20:59:26 -0700 (PDT) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EE2A73A3337; Tue, 1 Jun 2021 20:59:25 -0700 (PDT) Received: from fraeml703-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Fvw8w2qWRz6P3j6; Wed, 2 Jun 2021 11:52:48 +0800 (CST) Received: from dggpemm500002.china.huawei.com (7.185.36.229) by fraeml703-chm.china.huawei.com (10.206.15.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Wed, 2 Jun 2021 05:59:17 +0200 Received: from dggpemm500002.china.huawei.com (7.185.36.229) by dggpemm500002.china.huawei.com (7.185.36.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Wed, 2 Jun 2021 11:59:14 +0800 Received: from dggpemm500002.china.huawei.com ([7.185.36.229]) by dggpemm500002.china.huawei.com ([7.185.36.229]) with mapi id 15.01.2176.012; Wed, 2 Jun 2021 11:59:14 +0800 From: Mach Chen To: "draft-ninan-mpls-spring-inter-domain-oam@ietf.org" CC: "mpls-chairs@ietf.org" , "mpls@ietf.org" Thread-Topic: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 Thread-Index: AddXYNePcnIVic4hQKi6eG9X0nDXKw== Date: Wed, 2 Jun 2021 03:59:14 +0000 Message-ID: <5c57943cc68c4457ae622086cd484500@huawei.com> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.140] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jun 2021 03:59:29 -0000 Hi, I am selected as a MPLS-RT reviewer of draft-ninan-mpls-spring-inter-domain= -oam. After review, I think the problem that the draft is trying to address is va= lid and useful. The solution is overall workable. My comments are mainly ab= out Type 3 and Type 4 segment sub-TLV, I think it's better to address these= comments before the adoption. Type 3 and 4 sub-TLVs are supposed to be used when the headend/PMS does not= have the labels or SRGB information of the remote nodes, and assume that t= he receiving node (egress node) can derive the MPLS labels according to the= IPv4/IPv6 addresses. This assumption may not hold, because given that the = headend/PMS does not have the information, it is very likely that the recei= ving node has no the information either. So the draft should add more text = to clarify the use cases of type 3, 4 sub-TLVs, or just remove them. In addition, given type 3 and 4 have valid use case, the optional SID field= s of type 3 and 4 are redundant, I think that they should be removed.=20 Section 4,=20 "Below types of segment sub-TLVs are applicable for the Reverse Path Segment List TLV." Should the "Reverse Path Segment List TLV" be "Return Path TLV"? Best regards, Mach From nobody Wed Jun 2 10:34:25 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 95FE43A13D0 for ; Wed, 2 Jun 2021 10:34:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.65 X-Spam-Level: X-Spam-Status: No, score=-1.65 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id INz-c5hAZaGE for ; Wed, 2 Jun 2021 10:34:20 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 822E83A13CF for ; Wed, 2 Jun 2021 10:34:20 -0700 (PDT) Received: from faui48e.informatik.uni-erlangen.de (faui48e.informatik.uni-erlangen.de [131.188.34.51]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 6C35F548017; Wed, 2 Jun 2021 19:34:13 +0200 (CEST) Received: by faui48e.informatik.uni-erlangen.de (Postfix, from userid 10463) id 5E3514E764D; Wed, 2 Jun 2021 19:34:13 +0200 (CEST) Date: Wed, 2 Jun 2021 19:34:13 +0200 From: Toerless Eckert To: kireeti@juniper.net, mpls@ietf.org Message-ID: <20210602173413.GA53463@faui48e.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: [mpls] kireeti/mpls: draft-kompella-mpls-mspl4fa / draft-bryant-mpls-aux-data-pointer X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jun 2021 17:34:24 -0000 Some thoughts about the functionality and approaches of these two drafts: Kireetis draft re-designates ca. 8 bits of new SPLs, called FAI SPL. Every bit indicates a particular forwarding action which is conditionally executed whent he bit is set. Some of these conditional actions may require ancillary data below BoS. IMHO, the best of this proposal is the designation of those bits to indicate potentially for every hop, which forwarding actions to take. And the worst part of the proposal is that it is not extensible, because each bit has a hard-coded semantic. Another core issue raised by some is of course the question if/how the ancillary data has to be structured to be most easily parsable. Stewarts draft attempts to generalize the use of 8 bits of the SPL by using it as an 8-bit value pointing to (a block of) ancillary data below BoS. The goal was to be also indicating which function (as indicated by the ancillary data) needs to be executed by a hop(s) but to be more easily extensible, and make packets easier to parse. This comes at the downside of requiring 8-bits for "just" a single block of ancillary data. Given how i think we have no clear agreement what can and can not be easily parsed, i wanted to suggest a "best of both worlds" packet header to see how folks think about "parsability": In the MPLS labels Stack: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Forwarding Actions Indicator(FAI) SPL |.|. .|.|0|1|2|3|4|5|6 7| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Instead of fixed actions indicated by Kireetis proposal, we have 8 conditional action bis {0,...7}, each one indicating a conditional action: If a particular bit is set, its associated action is executed. Else that action is not executed. Below BoS: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |C| ID | Action | Length | ... ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |C| ID | Action | Length | ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Aka: below BoS, we have a sequence of ancillary data blocks, which are self-identifying by their action (aka: type) and chained by length. When an ancillar data block has it's C)onditional bit set, then it's ID field indicates which of the 8 conditional action it is being referred to. For example if C=1 and ID=5, then this action would only be executed if bit 5 of the FAI SPL was set. If C=0, the three ID bits could have other semantics than ID. If an Action has no further data, it is just 16 bits long in this encoding. Up to 64 actions, up to 128 byte length of ancillary data if the unit of Length is 16 bits. Of course, any of these encoding details are up for discussion, the main point is to use 8 bits in the FAI to indicate 8 conditional actions in an extensible fashion. If this proposal looks appealing from the perspective of extensibility, flexibility and per-hop conditional action encodings, then the main question really is how we are vetting what can and can-not be easily done by high-speed (Terrabits) packet parsers. E.g.: is this in the same "complexity" ball park as oher proposals. And i would love us to start having rules of what is and is not acceptable parsable instead of just "eyeballing" it. Cheers Toerless From nobody Wed Jun 2 15:18:24 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 418693A1DC3; Wed, 2 Jun 2021 15:18:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E_TcgJbUayJA; Wed, 2 Jun 2021 15:18:17 -0700 (PDT) Received: from mxus.zteusa.com (mxus.zteusa.com [4.14.134.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3C6C83A1DC0; Wed, 2 Jun 2021 15:18:11 -0700 (PDT) Received: from mse-us.zte.com.cn (unknown [10.36.11.29]) by Forcepoint Email with ESMTPS id 309385015855C294E15C; Thu, 3 Jun 2021 06:18:10 +0800 (CST) Received: from mgapp02.zte.com.cn ([10.36.9.143]) by mse-us.zte.com.cn with SMTP id 152MI4ca053084; Thu, 3 Jun 2021 06:18:04 +0800 (GMT-8) (envelope-from gregory.mirsky@ztetx.com) Received: from mapi (mgapp02[null]) by mapi (Zmail) with MAPI id mid81; Thu, 3 Jun 2021 06:18:04 +0800 (CST) Date: Thu, 3 Jun 2021 06:18:04 +0800 (CST) X-Zmail-TransId: 2afa60b8039c12cadd81 X-Mailer: Zmail v1.0 Message-ID: <202106030618046067599@zte.com.cn> In-Reply-To: <202106020654544466296@zte.com.cn> References: 202106020654544466296@zte.com.cn Mime-Version: 1.0 From: To: Cc: , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-us.zte.com.cn 152MI4ca053084 Archived-At: Subject: Re: [mpls] =?utf-8?q?MPLS-RT_review_of_draft-ninan-mpls-spring-inter?= =?utf-8?q?-domain-oam?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jun 2021 22:18:23 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Dear Sharaddha, et al., my apologies for sending out my notes in an unreadable format. Regards, Greg Mirsky ------------------Original Mail------------------ Sender: gregory mirsky10211915 To: ShraddhaHegde; CC: loa@pi.nu;mpls@ietf.org;draft-ninan-mpls-spring-inter-domain-oam@ietf.org;mpls-chairs@ietf.org; Date: 2021/06/01 15:54 Subject: Re:[mpls] MPLS-RT review of draft-ninan-mpls-spring-inter-domain-oam Hi Shraddha, thank you for your answers to my review. Please find my follow-up notes in-lined below under the GIM>> tag. Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn Sender: ShraddhaHegde To: gregory mirsky10211915;loa@pi.nu;mpls@ietf.org;draft-ninan-mpls-spring-inter-domain-oam@ietf.org;mpls-chairs@ietf.org; Date: 2021/05/31 10:18 Subject: RE: Re:[mpls] MPLS-RT review of draft-ninan-mpls-spring-inter-domain-oam #zreadTextPanel v\:* {behavior:url(#default#VML);} #zreadTextPanel o\:* {behavior:url(#default#VML);} #zreadTextPanel w\:* {behavior:url(#default#VML);} #zreadTextPanel .shape {behavior:url(#default#VML);}Hi Greg, Thanks for the review and comments. Pls see inline for the reply. Juniper Business Use Only From: gregory.mirsky@ztetx.com Sent: Tuesday, May 25, 2021 1:40 AM To: loa@pi.nu; mpls@ietf.org; draft-ninan-mpls-spring-inter-domain-oam@ietf.org; mpls-chairs@ietf.org Subject: Re:[mpls] MPLS-RT review of draft-ninan-mpls-spring-inter-domain-oam [External Email. Be cautious of content] Dear Authors, WG Chairs, et al., I've been asked to review the draft-ninan-mpls-spring-inter-domain-oam. I've concentrated on three criteria: clarity of the document the technical value of the problem addressed technical feasability of the proposed solution Below are my notes on these three aspects: The document is reasonably well-written and is readable. I couldn't find a sufficient technical explanation for introducing a new mechanism for the inter-domain ping/traceroute in addition to the one described in RFC 7743. Introduction section has some text on how this draft is different from RFC 7743 “ [RFC7743] describes a Echo-relay based solution based on advertising a new Relay Node Address Stack TLV containing stack of Echo-relay ip addresses. That mechanism requires the return ping packet to reach the control plane on every relay node.” Basically, RFC 7743 mechanism requires that the relay nodes receive reply packet interpret it and then forward further. This draft is proposing much simplified solution which does not require control plane involvement on intermediate nodes. It uses segment routing forwarding plane. I can add some more text to clarify this. GIM>> What role or actions of the control plane, in your opinion, is required in RFC 7743? I agree with you that the proposed in this draft solution is different from the one described in RFC 7743. But, as I understand it, RFC 7743 is equally applicable to the SR-MPLS case, and it appears that the problem of e2e LSP ping in a multi-domain case is already being addressed. It seems that the proposed mechanism has several issues: Three types of SID sub-TLVs are defined, but only use of one is mentioned in the document. I couldn't find an explanation of the relationship between IPv4/IPv6 Node Address and SID in Type 3 and Type 4 sub-TLVs, respectively Also, in which scenario the SID field in Type 3 and Type 4 sub-TLVs is recommended? Type 3 and type 4 is useful when the SRGB of the remote node is not available on the headend/PMS that is constructing the return path TLV. The IPv4 node address is used by the receiving node to create mpls label from it’s own SRGB. The SID is optional. It can be added if the PMS/headend knows the SID. There is no strong usecase for the optional SID field. These TLV structure are directly derived from the SR policy TLV structures in order to be consistent with the Segment routing conventions of describing a path. I’ll add a new section to describe this. And further, traceroute mode is called out of the scope of RFC 7743. I've read the explanation of traceroute in the draft, and I don't think it is a workable solution. The draft defines two different solutions for trace route. The headend/PMS constructed is define in sec 7.2 and the dynamically constructed return path Described in section 8. Which one are you saying isn’t workable? Also would be helpful if you can specify details of why you think it will not work. GIM>> As I recall the traceroute mode described in RFC 8029 and RFC 8287, TTL expiration is used s the exception mechanism. I couldn't find in the draft the explanation of which exception mechanisms are used to trace an SR-MPLS e2e tunnel. Also, the mechanism described in Section 7.2 appears as series of LSP pings rather than tracing a path through. I don't feel that the draft is ready for WG adoption at this point. I much appreciate your consideration of my comments and looking forward to discussing them with the authors. Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn --=====_003_next=====-- --=====_001_next=====-- From nobody Wed Jun 2 21:30:32 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7BFCD3A28BA; Wed, 2 Jun 2021 21:30:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.497 X-Spam-Level: X-Spam-Status: No, score=-3.497 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=EL118P59; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR05MB3576.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 801650df-db26-458a-039e-08d9264848bb X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Jun 2021 04:30:14.8272 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: s4VvnGOvYUxGvnmXIBixDryN/SHf6Rei2HP1YMvVQIpXeR4cSCmbVz21MhGjXM7mKhDM6q6eDENidQlq7syknQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR05MB3575 X-Proofpoint-ORIG-GUID: V9nv-vRsFbw9qPLS_EAV-awFJba7iu7K X-Proofpoint-GUID: V9nv-vRsFbw9qPLS_EAV-awFJba7iu7K X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-06-03_01:2021-06-02, 2021-06-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 mlxlogscore=999 mlxscore=0 malwarescore=0 spamscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1011 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106030028 Archived-At: Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Jun 2021 04:30:30 -0000 Hi Mach, Thanks for the review. Pls see inline ... Juniper Business Use Only -----Original Message----- From: Mach Chen =20 Sent: Wednesday, June 2, 2021 9:29 AM To: draft-ninan-mpls-spring-inter-domain-oam@ietf.org Cc: mpls-chairs@ietf.org; mpls@ietf.org Subject: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 [External Email. Be cautious of content] Hi, I am selected as a MPLS-RT reviewer of draft-ninan-mpls-spring-inter-domain= -oam. After review, I think the problem that the draft is trying to address is va= lid and useful. The solution is overall workable. My comments are mainly ab= out Type 3 and Type 4 segment sub-TLV, I think it's better to address these= comments before the adoption. Sure. Type 3 and 4 sub-TLVs are supposed to be used when the headend/PMS does not= have the labels or SRGB information of the remote nodes, yes because these remote nodes lie in a different domain and SR= GB information may not be available at the headend in some cases. and assume that the receiving node (egress node) can derive the MPLS label= s according to the IPv4/IPv6 addresses.=20 =20 I will add a section with example of multi-domain network with different S= RGB and explain how Type 3 and Type 4 Segments can be used while building the return path dynamically for tracero= ute. The key is only the top segment has to be Type 3/Type 4 the remaining = segments to be of type label. For the Top segment, label has to be derived = from the SRGB of the receiving node (not someone else's) so its expected to= be available. This assumption may not hold, because given that the headend/PMS does not h= ave the information, it is very likely that the receiving node has no the i= nformation either. So the draft should add more text to clarify the use cas= es of type 3, 4 sub-TLVs, or just remove them. I'll add more text to describe clearly how type3/Type 4 should b= e used. In addition, given type 3 and 4 have valid use case, the optional SID field= s of type 3 and 4 are redundant, I think that they should be removed. SIDs are optional anyway. I would prefer to keep it in order to = be consistent with segment routing path description. Section 4, "Below types of segment sub-TLVs are applicable for the Reverse Path Segment List TLV." Should the "Reverse Path Segment List TLV" be "Return Path TLV"? Good catch. I'll fix it. 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[172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Fx5Jg4yLsz6F81j; Fri, 4 Jun 2021 09:48:35 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by fraeml742-chm.china.huawei.com (10.206.15.223) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Fri, 4 Jun 2021 03:55:08 +0200 Received: from dggpemm500002.china.huawei.com (7.185.36.229) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Fri, 4 Jun 2021 09:55:06 +0800 Received: from dggpemm500002.china.huawei.com ([7.185.36.229]) by dggpemm500002.china.huawei.com ([7.185.36.229]) with mapi id 15.01.2176.012; Fri, 4 Jun 2021 09:55:06 +0800 From: Mach Chen To: Shraddha Hegde , "draft-ninan-mpls-spring-inter-domain-oam@ietf.org" CC: "mpls-chairs@ietf.org" , "mpls@ietf.org" Thread-Topic: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 Thread-Index: AddXYNePcnIVic4hQKi6eG9X0nDXKwAb904gAETnlEA= Date: Fri, 4 Jun 2021 01:55:06 +0000 Message-ID: <44283e3adaa1487d860630f97c57d85b@huawei.com> References: <5c57943cc68c4457ae622086cd484500@huawei.com> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.243.140] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Jun 2021 01:55:17 -0000 Hi Shraddha, Thanks for considering the comments, looking forward to the revision. Best regards, Mach > -----Original Message----- > From: Shraddha Hegde [mailto:shraddha@juniper.net] > Sent: Thursday, June 3, 2021 12:30 PM > To: Mach Chen ; > draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: RE: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-0= 2 >=20 > Hi Mach, >=20 > Thanks for the review. > Pls see inline ... >=20 >=20 > Juniper Business Use Only >=20 > -----Original Message----- > From: Mach Chen > Sent: Wednesday, June 2, 2021 9:29 AM > To: draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 >=20 > [External Email. Be cautious of content] >=20 >=20 > Hi, >=20 > I am selected as a MPLS-RT reviewer of > draft-ninan-mpls-spring-inter-domain-oam. >=20 > After review, I think the problem that the draft is trying to address is = valid and > useful. The solution is overall workable. My comments are mainly about Ty= pe 3 > and Type 4 segment sub-TLV, I think it's better to address these comments > before the adoption. > Sure. >=20 > Type 3 and 4 sub-TLVs are supposed to be used when the headend/PMS does > not have the labels or SRGB information of the remote nodes, y= es > because these remote nodes lie in a different domain and SRGB informatio= n > may not be available at the headend in some cases. >=20 > and assume that the receiving node (egress node) can derive the MPLS lab= els > according to the IPv4/IPv6 addresses. > > I will add a section with example of multi-domain network with different= SRGB > and explain how Type 3 and Type 4 Segments can be used while building the > return path dynamically for traceroute. The key is only the top segment h= as to be > Type 3/Type 4 the remaining segments to be of type label. For the Top seg= ment, > label has to be derived from the SRGB of the receiving node (not someone = else's) > so its expected to be available. >=20 >=20 > This assumption may not hold, because given that the headend/PMS does not > have the information, it is very likely that the receiving node has no th= e > information either. So the draft should add more text to clarify the use = cases of > type 3, 4 sub-TLVs, or just remove them. > I'll add more text to describe clearly how type3/Type 4 should= be > used. >=20 > In addition, given type 3 and 4 have valid use case, the optional SID fie= lds of type > 3 and 4 are redundant, I think that they should be removed. > SIDs are optional anyway. I would prefer to keep it in order t= o be > consistent with segment routing > path description. >=20 > Section 4, > "Below types of segment sub-TLVs are applicable for the Reverse Path > Segment List TLV." >=20 > Should the "Reverse Path Segment List TLV" be "Return Path TLV"? > Good catch. I'll fix it. >=20 > Best regards, > Mach From nobody Fri Jun 4 06:50:57 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EF123A11A4; Fri, 4 Jun 2021 06:50:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.051 X-Spam-Level: X-Spam-Status: No, score=-1.051 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, MAY_BE_FORGED=0.846, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aymZQRUH5k1l; Fri, 4 Jun 2021 06:50:50 -0700 (PDT) Received: from mta7.iomartmail.com (mta7.iomartmail.com [62.128.193.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 541F13A11A2; Fri, 4 Jun 2021 06:50:49 -0700 (PDT) Received: from vs2.iomartmail.com (vs2.iomartmail.com [10.12.10.123]) by mta7.iomartmail.com (8.14.4/8.14.4) with ESMTP id 154DolDo031129; Fri, 4 Jun 2021 14:50:47 +0100 Received: from vs2.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DF2844604B; Fri, 4 Jun 2021 14:50:46 +0100 (BST) Received: from vs2.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D2EC246048; Fri, 4 Jun 2021 14:50:46 +0100 (BST) Received: from asmtp3.iomartmail.com (unknown [10.12.10.224]) by vs2.iomartmail.com (Postfix) with ESMTPS; Fri, 4 Jun 2021 14:50:46 +0100 (BST) Received: from LAPTOPK7AS653V (9.185.51.84.dyn.plus.net [84.51.185.9] (may be forged)) (authenticated bits=0) by asmtp3.iomartmail.com (8.14.4/8.14.4) with ESMTP id 154DojIE008619 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 4 Jun 2021 14:50:46 +0100 Reply-To: From: "Adrian Farrel" To: Cc: , References: <5c57943cc68c4457ae622086cd484500@huawei.com> <44283e3adaa1487d860630f97c57d85b@huawei.com> In-Reply-To: <44283e3adaa1487d860630f97c57d85b@huawei.com> Date: Fri, 4 Jun 2021 14:50:45 +0100 Organization: Old Dog Consulting Message-ID: <071b01d75948$9e6cd950$db468bf0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQHSSwWfztk50xVVXXoyRJh0RXJfMQJ/cec0AghmOdqq6bkqUA== Content-Language: en-gb X-Originating-IP: 84.51.185.9 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.1.0.2034-8.6.0.1017-26200.000 X-TM-AS-Result: No--25.679-10.0-31-10 X-imss-scan-details: No--25.679-10.0-31-10 X-TMASE-Version: IMSVA-9.1.0.2034-8.6.1017-26200.000 X-TMASE-Result: 10--25.679400-10.000000 X-TMASE-MatchedRID: b/1IsOqez6eWfDtBOz4q23FPUrVDm6jt+IfriO3cV8RTpFNEkr6HJoda YX5m6/4YR8EC1tit1BvmcHnEPnqenmcPPLBO2A0bkmtbTcNpxYSZrgJQpYk0sxgoY1prIgoItzB kuk8VO0C3p6/YFpFOqmWM9bBlorLigU6Zx32xJGJyxbfjhbMtyODTYjejIZTwLX3qyf3ewG+tg0 pkemZ4ojnpSV66h8LNVDbs0z7KrCUZPA3643YXYorkmrf0Igi/h1VTeTxSalHLkl8e9W70izaqW BgHP7EjOa2iSLW78KeXimJN0T8TujOOxCxJsyam8pRHzcG+oi0KF0jiwuWuOCGD+Fp3vZHU8f4S tkBOa36aaBYwlL5lPqzGU31jm862CePRqObI81crT6V6InEuV0jEWwwu715sdcfU63y8xPC95iY VgizGV+zAnKDfeixr7c2dg3HqZ1g3DY7ZrB9oHCfphWrcxCwjpNh/2/1+WiWqvcIF1TcLYHyzv7 t8jixK4K9FmervsqUtPe52cSCmDLfptZTbFVSKKZ73BulBsrkUg4oIuVTlOH9nRLJB1yYQfF4vd Mjb6UzE7gW9Nmz5nEiM5ASkVZ8SCpuZLe/V2zHY6EGR3k/uimj1CdgkJWDyZ7zzpl+OAuJnbyAT PFLi0kW/yMoEqTx3FOzk8G4VOiw5HWa1kxc3MQuLP4ROdWHVbXmIkXx4Tqu15eNIExieaQhcpg6 xdvxtBm33ka/xTVdqVVqMUD2FvXMncJz91M+xtT4jIeGRd/XExmr5hqNL1qY7XH28Hn1Ro8WMkQ Wv6iV5glWMeWj1NKebHCxzBV4TKzfM9B6IRt76C0ePs7A07YVH0dq7wY7uA/3R8k/14e0= X-TMASE-SNAP-Result: 1.821001.0001-0-1-12:0,22:0,33:0,34:0-0 Archived-At: Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Jun 2021 13:50:55 -0000 Hi All, I'm late to this party. Sorry. Responding on the top of thread to make it easier to find. I understand why you use the term "domain" and it would be perfectly reasonable except that RFC 8402 takes that term and gives it very specific meaning, admittedly as "SR domain" most of the time, but degrading to just "domain" on page 7. 8402 does also have one mention of "IGP domain" and one of "routing domain". Section 4.2 got away with "source-routed inter-domain paths" while Section 8 says that SR operates "within a trusted domain" with traffic filtering at domain boundaries (section 8.1 has a lot of information that should be relevant to this document). Recently, there has been a lot of confusion (in the IESG, for example) as to what the scope and limits of an "SR domain" are. I think that a lot of this comes from Section 8 of RFC 8402. At the very least, there was a misunderstanding of the intended scope of SR since (except in a few multi-AS companies) adjacent ASes to not have a shared trust model. I suggest that you take some time (probably in Section 1) with a new subsection on "Definitions of Domain" to try to clarify this. One thing we noticed in pushing draft-ietf-bess-datacenter-gateway through the IESG was that it is possible to build on the "SR domain" concept in a constructive way such that it is constructed of: - all nodes in the source SR-enabled network - all nodes in the destination SR-enabled network - all ASBRs along the path from source to destination network While it may (or may not) be the case that the transit nodes in an AS are SR-enabled, it is not important to the way you are building an "SR overlay". Cheers, Adrian -----Original Message----- From: mpls On Behalf Of Mach Chen Sent: 04 June 2021 02:55 To: Shraddha Hegde ; draft-ninan-mpls-spring-inter-domain-oam@ietf.org Cc: mpls@ietf.org; mpls-chairs@ietf.org Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 Hi Shraddha, Thanks for considering the comments, looking forward to the revision. Best regards, Mach > -----Original Message----- > From: Shraddha Hegde [mailto:shraddha@juniper.net] > Sent: Thursday, June 3, 2021 12:30 PM > To: Mach Chen ; > draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: RE: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 > > Hi Mach, > > Thanks for the review. > Pls see inline ... > > > Juniper Business Use Only > > -----Original Message----- > From: Mach Chen > Sent: Wednesday, June 2, 2021 9:29 AM > To: draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 > > [External Email. Be cautious of content] > > > Hi, > > I am selected as a MPLS-RT reviewer of > draft-ninan-mpls-spring-inter-domain-oam. > > After review, I think the problem that the draft is trying to address is valid and > useful. The solution is overall workable. My comments are mainly about Type 3 > and Type 4 segment sub-TLV, I think it's better to address these comments > before the adoption. > Sure. > > Type 3 and 4 sub-TLVs are supposed to be used when the headend/PMS does > not have the labels or SRGB information of the remote nodes, yes > because these remote nodes lie in a different domain and SRGB information > may not be available at the headend in some cases. > > and assume that the receiving node (egress node) can derive the MPLS labels > according to the IPv4/IPv6 addresses. > > I will add a section with example of multi-domain network with different SRGB > and explain how Type 3 and Type 4 Segments can be used while building the > return path dynamically for traceroute. The key is only the top segment has to be > Type 3/Type 4 the remaining segments to be of type label. For the Top segment, > label has to be derived from the SRGB of the receiving node (not someone else's) > so its expected to be available. > > > This assumption may not hold, because given that the headend/PMS does not > have the information, it is very likely that the receiving node has no the > information either. So the draft should add more text to clarify the use cases of > type 3, 4 sub-TLVs, or just remove them. > I'll add more text to describe clearly how type3/Type 4 should be > used. > > In addition, given type 3 and 4 have valid use case, the optional SID fields of type > 3 and 4 are redundant, I think that they should be removed. > SIDs are optional anyway. I would prefer to keep it in order to be > consistent with segment routing > path description. > > Section 4, > "Below types of segment sub-TLVs are applicable for the Reverse Path > Segment List TLV." > > Should the "Reverse Path Segment List TLV" be "Return Path TLV"? > Good catch. I'll fix it. > > Best regards, > Mach _______________________________________________ mpls mailing list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls From nobody Mon Jun 7 06:40:47 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 0AFBD3A16A3; Mon, 7 Jun 2021 06:40:46 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: The IESG To: "IETF-Announce" X-Test-IDTracker: no X-IETF-IDTracker: 7.30.0 Auto-Submitted: auto-generated Precedence: bulk CC: Loa Andersson , draft-ietf-mpls-lsp-ping-ospfv3-codepoint@ietf.org, loa@pi.nu, martin.vigoureux@nokia.com, mpls-chairs@ietf.org, mpls@ietf.org Reply-To: last-call@ietf.org Sender: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <162307324550.16699.4497089703953567684@ietfa.amsl.com> Date: Mon, 07 Jun 2021 06:40:46 -0700 Archived-At: Subject: [mpls] Last Call: (OSPFv3 CodePoint for MPLS LSP Ping) to Proposed Standard X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Jun 2021 13:40:46 -0000 The IESG has received a request from the Multiprotocol Label Switching WG (mpls) to consider the following document: - 'OSPFv3 CodePoint for MPLS LSP Ping' as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the last-call@ietf.org mailing lists by 2021-06-21. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract IANA has created "Protocol in the Segment IS Sub-TLV" and "Protocol in the Label Stack Sub-TLV of the Downstream Detailed Mapping TLV" registries under the "Multi-Protocol Label Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" registry. RFC8287 defines the code points for OSPF and IS-IS. This document proposes the code point to be used in the Segment ID Sub-TLV and Downstream Detailed Mapping TLV when the IGP is OSPFv3. This document also updates RFC8287 by clarifying that the existing "OSPF" code point is to be used only to indicate OSPFv2, and by defining the behavior when the Segment ID SUb-TLV indicates the use of IPv6. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-mpls-lsp-ping-ospfv3-codepoint/ No IPR declarations have been submitted directly on this I-D. From nobody Wed Jun 9 02:44:39 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 98D5D3A1903; Wed, 9 Jun 2021 02:44:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7Rk-mP8fVwmm; Wed, 9 Jun 2021 02:44:31 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 478C43A18FE; Wed, 9 Jun 2021 02:44:30 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id C348E348790; Wed, 9 Jun 2021 11:44:27 +0200 (CEST) From: Loa Andersson To: "mpls@ietf.org" Cc: "mpls-chairs@ietf.org" , "pals-chairs@ietf.org" , DetNet Chairs , "spring-chairs@ietf.org" Message-ID: Date: Wed, 9 Jun 2021 11:43:50 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Soliciting agenda items for the upcoming Open DT on Thursday (2021-06-10) X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jun 2021 09:44:37 -0000 Design Team, Sorry to run a bit late, but I have posted a agend for the Open DT meeting on Thursday: https://trac.ietf.org/trac/mpls/wiki/2021-06-10-agenda A couple of meetings ago we had a discussion on indicators and ancillary data in and after the label stack. The discussion was helpful and I have converted it to text. My intention is that iff we have time will discuss it in this meeting. https://datatracker.ietf.org/doc/draft-andersson-mpls-indicators-and-anxillary-data/ The intention is to try to focus on what is required and what we want to do. As always - if you have issues that you want to discuss send a mail to the chairs, we'll find a slot on the agenda, now or next meeting. /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Wed Jun 9 05:09:56 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B83DC3A1327; Wed, 9 Jun 2021 05:09:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.796 X-Spam-Level: X-Spam-Status: No, score=-2.796 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=aSuz7ZdK; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR05MB3576.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5ea3c209-7a34-4c3e-ebd0-08d92b3f7942 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Jun 2021 12:09:46.5769 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qCEU0uGzLshWVjcB/Q57t2VDyfbZcd0j3goKlJBSRmdRpmoXEsfpzkNDc6HJoL1gHl75jWC2ej3ffhoQtn/0Lw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR05MB3077 X-Proofpoint-GUID: LTN25QQ1qmXLIBJHDzW8nDJQbeci7Ta7 X-Proofpoint-ORIG-GUID: LTN25QQ1qmXLIBJHDzW8nDJQbeci7Ta7 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-06-09_04:2021-06-04, 2021-06-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 impostorscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 spamscore=0 clxscore=1011 malwarescore=0 lowpriorityscore=0 priorityscore=1501 mlxscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106090059 Archived-At: Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jun 2021 12:09:55 -0000 Thanks for the review and comments Adrian.=20 I'll add a new section as per your suggestion. Rgds Shraddha Juniper Business Use Only -----Original Message----- From: Adrian Farrel =20 Sent: Friday, June 4, 2021 7:21 PM To: draft-ninan-mpls-spring-inter-domain-oam@ietf.org Cc: mpls@ietf.org; mpls-chairs@ietf.org Subject: RE: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-= oam-02 [External Email. Be cautious of content] Hi All, I'm late to this party. Sorry. Responding on the top of thread to make it e= asier to find. I understand why you use the term "domain" and it would be perfectly reason= able except that RFC 8402 takes that term and gives it very specific meanin= g, admittedly as "SR domain" most of the time, but degrading to just "domai= n" on page 7. 8402 does also have one mention of "IGP domain" and one of "r= outing domain". Section 4.2 got away with "source-routed inter-domain paths= " while Section 8 says that SR operates "within a trusted domain" with traf= fic filtering at domain boundaries (section 8.1 has a lot of information th= at should be relevant to this document). Recently, there has been a lot of confusion (in the IESG, for example) as t= o what the scope and limits of an "SR domain" are. I think that a lot of th= is comes from Section 8 of RFC 8402. At the very least, there was a misunde= rstanding of the intended scope of SR since (except in a few multi-AS companies) adjacent ASes to not have a shared trust model. I suggest that you take some time (probably in Section 1) with a new subsec= tion on "Definitions of Domain" to try to clarify this. One thing we noticed in pushing draft-ietf-bess-datacenter-gateway through = the IESG was that it is possible to build on the "SR domain" concept in a c= onstructive way such that it is constructed of: - all nodes in the source SR-enabled network - all nodes in the destination SR-enabled network - all ASBRs along the path from source to destination network While it may (or may not) be the case that the transit nodes in an AS are S= R-enabled, it is not important to the way you are building an "SR overlay". Cheers, Adrian -----Original Message----- From: mpls On Behalf Of Mach Chen Sent: 04 June 2021 02:55 To: Shraddha Hegde ; draft-ninan-mpls-spring-inter-do= main-oam@ietf.org Cc: mpls@ietf.org; mpls-chairs@ietf.org Subject: Re: [mpls] MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 Hi Shraddha, Thanks for considering the comments, looking forward to the revision. Best regards, Mach > -----Original Message----- > From: Shraddha Hegde [mailto:shraddha@juniper.net] > Sent: Thursday, June 3, 2021 12:30 PM > To: Mach Chen ; > draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: RE: MPLS-RT review on=20 > draft-ninan-mpls-spring-inter-domain-oam-02 > > Hi Mach, > > Thanks for the review. > Pls see inline ... > > > Juniper Business Use Only > > -----Original Message----- > From: Mach Chen > Sent: Wednesday, June 2, 2021 9:29 AM > To: draft-ninan-mpls-spring-inter-domain-oam@ietf.org > Cc: mpls-chairs@ietf.org; mpls@ietf.org > Subject: MPLS-RT review on draft-ninan-mpls-spring-inter-domain-oam-02 > > [External Email. Be cautious of content] > > > Hi, > > I am selected as a MPLS-RT reviewer of=20 > draft-ninan-mpls-spring-inter-domain-oam. > > After review, I think the problem that the draft is trying to address=20 > is valid and > useful. The solution is overall workable. My comments are mainly about Type 3 > and Type 4 segment sub-TLV, I think it's better to address these=20 > comments before the adoption. > Sure. > > Type 3 and 4 sub-TLVs are supposed to be used when the headend/PMS=20 > does not have the labels or SRGB information of the remote nodes,=20 > yes > because these remote nodes lie in a different domain and SRGB=20 > information may not be available at the headend in some cases. > > and assume that the receiving node (egress node) can derive the MPLS labels > according to the IPv4/IPv6 addresses. > > I will add a section with example of multi-domain network with=20 > different SRGB > and explain how Type 3 and Type 4 Segments can be used while building=20 > the return path dynamically for traceroute. The key is only the top=20 > segment has to be > Type 3/Type 4 the remaining segments to be of type label. For the Top segment, > label has to be derived from the SRGB of the receiving node (not=20 > someone else's) > so its expected to be available. > > > This assumption may not hold, because given that the headend/PMS does=20 > not have the information, it is very likely that the receiving node=20 > has no the information either. So the draft should add more text to=20 > clarify the use cases of > type 3, 4 sub-TLVs, or just remove them. > I'll add more text to describe clearly how type3/Type 4=20 > should be > used. > > In addition, given type 3 and 4 have valid use case, the optional SID fields of type > 3 and 4 are redundant, I think that they should be removed. > SIDs are optional anyway. I would prefer to keep it in=20 > order to be > consistent with segment routing > path description. > > Section 4, > "Below types of segment sub-TLVs are applicable for the Reverse Path > Segment List TLV." > > Should the "Reverse Path Segment List TLV" be "Return Path TLV"? > Good catch. I'll fix it. > > Best regards, > Mach _______________________________________________ mpls mailing list mpls@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/mpls__;!!= NEt6yMaO-gk!T-XDUtVJDs_dsTmVf1bWX7WGfgK9jxzT9ofqUK7yXUg9uVOmmlcazjp1aHKwlJZ= 8$ From nobody Thu Jun 10 07:20:32 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id EA4563A4260; Thu, 10 Jun 2021 07:20:25 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Tero Kivinen via Datatracker To: Cc: draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org, last-call@ietf.org, mpls@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.31.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <162333482591.8235.4418205938937483332@ietfa.amsl.com> Reply-To: Tero Kivinen Date: Thu, 10 Jun 2021 07:20:25 -0700 Archived-At: Subject: [mpls] Secdir last call review of draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Jun 2021 14:20:26 -0000 Reviewer: Tero Kivinen Review result: Has Nits I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. This document allocates a code point for OSPFv3 for MPLS LSP Ping and updates previous allocation to only cover OSPFv2. It also defines behavior when using IPv6 with OSPv3. This document is quite short but hard to ready because of heavy use of acronyms and just referencing code points with numbers and same with RFCs. The security considerations section just says: This document updates [RFC8287] and does not introduce any additional security considerations. And I am not completely sure if that is true, if this document really allows using IPv6 when it was not possible before. Quite often having multiple address families do cause new security considerations too. Also RFC8287 refers to the RFC8029 for its security considerations, so perhaps direct reference to RFC8029 would be needed here. There are several acronyms which are not expanded on their first use (including in title, and in abstract). Examples of such are IS, TLV, OSPF, IS+IS, IGP, SUb-TLV (is the spelling correct in abstract with uppercase u?), FEC. The use of just RFC numbers in reference format makes the document hard to read as not everybody remembers what RFC is RFC number 8287, 8402 etc. It would be much nicer to at least on the first time use the format where the text refers to RFC with title or similar and just has the reference in parenthesis, i.e.: RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) to support IPv6. RFC5838 "Support of Address Families in OSPFv3" ([RFC5838]) describes the mechanism to support multiple address families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 prefixes. is easier for reader than current format: [RFC5340] describes OSPF version 3 (OSPFv3) to support IPv6. [RFC5838] describes the mechanism to support multiple address families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 prefixes. Or, as the rfc title tells what the RFC is about you do not need to explain it that much you can simply say: RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) and RFC5838 "Support of Address Families in OSPFv3" ([RFC5838]) describes how OSPFv3 may be used to advertise IPv6 and IPv4 prefixes. Also someone who is not at all familiar with this it is bit hard to know what are Type 34, 35, and 36 in Segment Id Sub-TLV registry. As a personal note, I have never liked to just use the reference inside text (for example "This document updates [RFC8287] ...") as in case the RFC rendering engine decides to render references in some other way than just text with [] around it, the text might get unreadable (For example it replaces the text inside [] with number or footnote or similar). Thats why I myself usually want to write those either as "This document updates RFC8287 ([RFC8287])..." or even "This document updates RFC8287..." as RFC8287 is referenced so many times in the document that there is no need to make each instance a reference. But this is just my personal view, and authors might have different views... From nobody Thu Jun 10 09:34:22 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 50DBD3A0113 for ; Thu, 10 Jun 2021 09:34:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.87 X-Spam-Level: X-Spam-Status: No, score=-0.87 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PFk9Zmh5TW9P for ; Thu, 10 Jun 2021 09:34:17 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E979D3A011D for ; Thu, 10 Jun 2021 09:34:16 -0700 (PDT) Received: from faui48e.informatik.uni-erlangen.de (faui48e.informatik.uni-erlangen.de [131.188.34.51]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id E95E5548027; Thu, 10 Jun 2021 18:34:09 +0200 (CEST) Received: by faui48e.informatik.uni-erlangen.de (Postfix, from userid 10463) id DE9E44E770E; Thu, 10 Jun 2021 18:34:09 +0200 (CEST) Date: Thu, 10 Jun 2021 18:34:09 +0200 From: Toerless Eckert To: kireeti@juniper.net, mpls@ietf.org Message-ID: <20210610163409.GA27942@faui48e.informatik.uni-erlangen.de> References: <20210602173413.GA53463@faui48e.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210602173413.GA53463@faui48e.informatik.uni-erlangen.de> User-Agent: Mutt/1.10.1 (2018-07-13) Archived-At: Subject: Re: [mpls] kireeti/mpls: draft-kompella-mpls-mspl4fa / draft-bryant-mpls-aux-data-pointer X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Jun 2021 16:34:22 -0000 THanks for the discussion today. I have uploaded the pptx to the wiki including aded slides capturing the discussion points we had today Its under the OngoingDesignWiki sections (ConditionalActions). Cheers Toerless On Wed, Jun 02, 2021 at 07:34:13PM +0200, Toerless Eckert wrote: > Some thoughts about the functionality and approaches of these two drafts: > > Kireetis draft re-designates ca. 8 bits of new SPLs, called FAI SPL. > Every bit indicates a particular forwarding action which is > conditionally executed whent he bit is set. Some of these > conditional actions may require ancillary data below BoS. > > IMHO, the best of this proposal is the designation of those > bits to indicate potentially for every hop, which forwarding > actions to take. And the worst part of the proposal is that it > is not extensible, because each bit has a hard-coded semantic. > Another core issue raised by some is of course the question > if/how the ancillary data has to be structured to be most > easily parsable. > > Stewarts draft attempts to generalize the use of 8 bits of the SPL > by using it as an 8-bit value pointing to (a block of) ancillary > data below BoS. The goal was to be also indicating which > function (as indicated by the ancillary data) needs to be > executed by a hop(s) but to be more easily extensible, and > make packets easier to parse. This comes at the downside of > requiring 8-bits for "just" a single block of ancillary data. > > Given how i think we have no clear agreement what can and can not > be easily parsed, i wanted to suggest a "best of both worlds" > packet header to see how folks think about "parsability": > > In the MPLS labels Stack: > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > |Forwarding Actions Indicator(FAI) SPL |.|. .|.|0|1|2|3|4|5|6 7| > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Instead of fixed actions indicated by Kireetis proposal, > we have 8 conditional action bis {0,...7}, each one indicating > a conditional action: If a particular bit is set, its associated > action is executed. Else that action is not executed. > > Below BoS: > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > |C| ID | Action | Length | ... > ... > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > ... > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > |C| ID | Action | Length | > ... > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Aka: below BoS, we have a sequence of ancillary data blocks, > which are self-identifying by their action (aka: type) and > chained by length. > > When an ancillar data block has it's > C)onditional bit set, then it's ID field indicates which of > the 8 conditional action it is being referred to. For example if > C=1 and ID=5, then this action would only be executed if > bit 5 of the FAI SPL was set. If C=0, the three ID bits could > have other semantics than ID. > > If an Action has no further data, it is just 16 bits long > in this encoding. Up to 64 actions, up to 128 byte > length of ancillary data if the unit of Length is 16 bits. > > Of course, any of these encoding details are up for discussion, > the main point is to use 8 bits in the FAI to indicate > 8 conditional actions in an extensible fashion. > > If this proposal looks appealing from the perspective of > extensibility, flexibility and per-hop conditional action > encodings, then the main question really is how we > are vetting what can and can-not be easily done by > high-speed (Terrabits) packet parsers. E.g.: is this > in the same "complexity" ball park as oher proposals. > > And i would love us to start having rules of what is and is > not acceptable parsable instead of just "eyeballing" it. > > Cheers > Toerless -- --- tte@cs.fau.de From nobody Fri Jun 11 00:58:52 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 95DB53A2DCF; Fri, 11 Jun 2021 00:58:42 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Christer Holmberg via Datatracker To: Cc: draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org, last-call@ietf.org, mpls@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.31.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <162339832253.24163.8210945265296547396@ietfa.amsl.com> Reply-To: Christer Holmberg Date: Fri, 11 Jun 2021 00:58:42 -0700 Archived-At: Subject: [mpls] Genart last call review of draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jun 2021 07:58:43 -0000 Reviewer: Christer Holmberg Review result: Almost Ready I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04 Reviewer: Christer Holmberg Review Date: 2021-06-11 IETF LC End Date: 2021-06-21 IESG Telechat date: Not scheduled for a telechat Summary: The document is easy to read, and is almost ready for publication. However, I do have a few editorial comments that I would like the authors to address. Major issues: N/A Minor issues: N/A Nits/editorial comments: Q1: The Abstract and Introductions says: "This document proposes the code point to be used in the Segment ID Sub-TLV and Downstream Detailed Mapping TLV when the IGP is OSPFv3." I suggest to say "specifies" or "defines" instead of "proposes". Q2: Would it be more clear to call Section 6 "Update to RFC 8287"? Q3: Section 6 says: "This document specifies that the above code points will be used only for OSPFv2." I suggest to be more explicit, and say something like: "This document updates RFC 8287, by specifying that the "OSPF" code points will be used only for OSPFv2." Q4: Section 7.2 adds a note to the IANA registry for the existing "OSPF" code point. Should this specification also be added as a reference for the existing "OSPF" code point (in addition to RFC 8287? From nobody Fri Jun 11 01:30:07 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B5D3D3A2EB1; Fri, 11 Jun 2021 01:29:58 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: mpls@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.31.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: mpls@ietf.org Message-ID: <162340019868.22327.7107546025773823859@ietfa.amsl.com> Date: Fri, 11 Jun 2021 01:29:58 -0700 Archived-At: Subject: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jun 2021 08:29:59 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiprotocol Label Switching WG of the IETF. Title : PMS/Head-end based MPLS Ping and Traceroute in Inter-domain SR Networks Authors : Shraddha Hegde Kapil Arora Mukul Srivastava Samson Ninan Nagendra Kumar Filename : draft-ninan-mpls-spring-inter-domain-oam-03.txt Pages : 21 Date : 2021-06-11 Abstract: Segment Routing (SR) architecture leverages source routing and tunneling paradigms and can be directly applied to the use of a Multiprotocol Label Switching (MPLS) data plane. A network may consist of multiple IGP domains or multiple ASes under the control of same organization. It is useful to have the LSP Ping and traceroute procedures when an SR end-to-end path spans across multiple ASes or domains. This document describes mechanisms to facilitae LSP ping and traceroute in inter-AS/inter-domain SR networks in an efficient manner with simple OAM protocol extension which uses dataplane forwarding alone for sending echo reply. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ninan-mpls-spring-inter-domain-oam/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-ninan-mpls-spring-inter-domain-oam-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ninan-mpls-spring-inter-domain-oam-03 Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Jun 11 01:34:28 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DE2633A2ED5; Fri, 11 Jun 2021 01:34:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.797 X-Spam-Level: X-Spam-Status: No, score=-2.797 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR05MB3576.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8c2e5c52-8dbd-44fd-785b-08d92cb3af5e X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Jun 2021 08:34:10.1318 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /nZ2KRSKyWpps/jfIev9YHxRnDqDALYWu10c4zy/Au8LJqYvmJLRVyELbNK4tKkNOHU5Zq6Ijj0W5Cz2yqwVFQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR0501MB3716 X-Proofpoint-ORIG-GUID: EqHSr2o8lQcBEEJLQk04DW4M923CdzyC X-Proofpoint-GUID: EqHSr2o8lQcBEEJLQk04DW4M923CdzyC X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-06-11_02:2021-06-11, 2021-06-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 adultscore=0 clxscore=1011 impostorscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106110054 Archived-At: Subject: Re: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jun 2021 08:34:27 -0000 Hi All, New version of draft-ninan-mpls-spring-inter-domain-oam is posted addressin= g comments from MPLS-RT review. Pls take a look and let me know if you have further comments. Rgds Shraddha Juniper Business Use Only -----Original Message----- From: mpls On Behalf Of internet-drafts@ietf.org Sent: Friday, June 11, 2021 2:00 PM To: i-d-announce@ietf.org Cc: mpls@ietf.org Subject: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt [External Email. Be cautious of content] A New Internet-Draft is available from the on-line Internet-Drafts director= ies. This draft is a work item of the Multiprotocol Label Switching WG of the IE= TF. Title : PMS/Head-end based MPLS Ping and Traceroute in In= ter-domain SR Networks Authors : Shraddha Hegde Kapil Arora Mukul Srivastava Samson Ninan Nagendra Kumar Filename : draft-ninan-mpls-spring-inter-domain-oam-03.txt Pages : 21 Date : 2021-06-11 Abstract: Segment Routing (SR) architecture leverages source routing and tunneling paradigms and can be directly applied to the use of a Multiprotocol Label Switching (MPLS) data plane. A network may consist of multiple IGP domains or multiple ASes under the control of same organization. It is useful to have the LSP Ping and traceroute procedures when an SR end-to-end path spans across multiple ASes or domains. This document describes mechanisms to facilitae LSP ping and traceroute in inter-AS/inter-domain SR networks in an efficient manner with simple OAM protocol extension which uses dataplane forwarding alone for sending echo reply. The IETF datatracker status page for this draft is: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ninan-mp= ls-spring-inter-domain-oam/__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2= mV0bTh80i0AzKeABzFQV3dfGS5TuJNnI5$ There is also an htmlized version available at: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-nin= an-mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nN= l8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5VMFXpJm$ A diff from the previous version is available at: https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=3Ddraft-ninan= -mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8= kTHr2mV0bTh80i0AzKeABzFQV3dfGS5QEnIeV0$ Internet-Drafts are also available by anonymous FTP at: https://urldefense.com/v3/__ftp://ftp.ietf.org/internet-drafts/__;!!NEt6yMa= O-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5T0hqLuk$ _______________________________________________ mpls mailing list mpls@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/mpls__;!!= NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5TdmWWC= x$= From nobody Fri Jun 11 02:00:36 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F6B83A2FA2; 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Fri, 11 Jun 2021 09:00:24 +0000 To: last-call@ietf.org References: <162307324550.16699.4497089703953567684@ietfa.amsl.com> Cc: mpls@ietf.org, draft-ietf-mpls-lsp-ping-ospfv3-codepoint@ietf.org, mpls-chairs@ietf.org From: tom petch Message-ID: <60C32625.1020107@btconnect.com> Date: Fri, 11 Jun 2021 10:00:21 +0100 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 In-Reply-To: <162307324550.16699.4497089703953567684@ietfa.amsl.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [86.143.250.86] X-ClientProxiedBy: LO4P123CA0386.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18f::13) To VI1PR07MB6704.eurprd07.prod.outlook.com (2603:10a6:800:18b::8) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.65] (86.143.250.86) by LO4P123CA0386.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18f::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4219.21 via Frontend Transport; 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Perhaps a place for a 'SHALL'. Tom Petch > The IESG plans to make a decision in the next few weeks, and solicits final > comments on this action. Please send substantive comments to the > last-call@ietf.org mailing lists by 2021-06-21. Exceptionally, comments may > be sent to iesg@ietf.org instead. In either case, please retain the beginning > of the Subject line to allow automated sorting. > > Abstract > > > IANA has created "Protocol in the Segment IS Sub-TLV" and "Protocol > in the Label Stack Sub-TLV of the Downstream Detailed Mapping TLV" > registries under the "Multi-Protocol Label Switching (MPLS) Label > Switched Paths (LSPs) Ping Parameters" registry. RFC8287 defines the > code points for OSPF and IS-IS. > > This document proposes the code point to be used in the Segment ID > Sub-TLV and Downstream Detailed Mapping TLV when the IGP is OSPFv3. > This document also updates RFC8287 by clarifying that the existing > "OSPF" code point is to be used only to indicate OSPFv2, and by > defining the behavior when the Segment ID SUb-TLV indicates the use > of IPv6. > > > > > The file can be obtained via > https://datatracker.ietf.org/doc/draft-ietf-mpls-lsp-ping-ospfv3-codepoint/ > > > > No IPR declarations have been submitted directly on this I-D. > > > > > > _______________________________________________ > IETF-Announce mailing list > IETF-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/ietf-announce > . > From nobody Fri Jun 11 05:31:52 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4A453A35F5; Fri, 11 Jun 2021 05:31:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZXsNQtqjfWNt; Fri, 11 Jun 2021 05:31:48 -0700 (PDT) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AEB173A35F3; Fri, 11 Jun 2021 05:31:46 -0700 (PDT) Received: from mse-fl2.zte.com.cn (unknown [10.30.14.239]) by Forcepoint Email with ESMTPS id 7EED17A401859CD3A345; Fri, 11 Jun 2021 20:31:43 +0800 (CST) Received: from njxapp03.zte.com.cn ([10.41.132.202]) by mse-fl2.zte.com.cn with SMTP id 15BCVaUP056045; Fri, 11 Jun 2021 20:31:37 +0800 (GMT-8) (envelope-from peng.shaofu@zte.com.cn) Received: from mapi (njxapp01[null]) by mapi (Zmail) with MAPI id mid201; Fri, 11 Jun 2021 20:31:36 +0800 (CST) Date: Fri, 11 Jun 2021 20:31:36 +0800 (CST) X-Zmail-TransId: 2af960c357a821801181 X-Mailer: Zmail v1.0 Message-ID: <202106112031367205917@zte.com.cn> Mime-Version: 1.0 From: To: , , Cc: Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-fl2.zte.com.cn 15BCVaUP056045 Archived-At: Subject: [mpls] =?utf-8?q?MPLS-RT_review_for_draft-rathi-mpls-egress-tlv-?= =?utf-8?q?for-nil-fec?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jun 2021 12:31:51 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Dear authors, chairs and secretary, I was selected to review this document. The following are my comments, which are only based on my current understanding. If there are any mistakes, please forgive and correct me. 1) I agree with the problem background described in section "2. Problem with nil FEC", the challenges and risks brought by using Nil FEC in some scenarios. For example, when SR policy is manually configured (or distributed by BGP) and segment type is specified as label type, the headend does not know the detailed FEC information for each segment. At this time, we can choose to include Nil FEC in the FEC stack of echo request. IMO, No matter which layer of FEC stack a Nil FEC is placed, it means that we lose the FEC Validation for this layer, that is, we can not determine whether the node to which an echo request packet arrives is the expected transit node or egress node of MPLS LSP. 2) Therefore, I think the egress TLV introduced in this document only has positive significance for PING mode, but has little significance for TRACEROUTE mode. According to RFC8029, PING mode is used to detect that the packets reache the expected egress node, while TRACEROUTE mode is in addition used to detect that the packets reache the expected transit node. It seems that, in the last sentence of section 2, the expression is inaccurate. In fact, there is no benefit to the processing of transit nodes. 3) If we focus on the benefits of egress TLV for PING mode, it seems that we can achieve the same effect by using the existing generic IP prefix FEC, which can be used to determine whether the PING packets have reached the desired destination node. This may be the necessary to consider the introduction of egress TLV in this document, that is, "Nil FEC + egress TLV" compared with "generic IP prefix FEC", provides the ability that the latter can not provide? Of course, these two options can coexist. If Nil FEC is selected, then the egress TLV is very useful. 4) According to RFC8287, PING mode can only contain a single Nil FEC corresponding to last segment, while TRACEROUTE mode must contain Nil FEC corresponding to each segment. Therefore, I am a little confused that the TRACEROUTE mode described in section "4.1. Sending Egress TLV in MPLS Echo Request" in this document only contains a single Nil FEC. Can authors indicate me which document you refer to? Although, the number of elements in FEC stack (for example, only a single Nil FEC) may be inconsistent with the number of elements in DDMAP label stack (for example, including the whole outgoing label stack corresponding to SID list), the traceroute processing described in RFC8029 does support this situation. My worry is that it will bring risks related with the transit node's reply of FEC change. In this case, it seems that FEC change can not be replied from the transit node, or the FEC change replies from the transit node needs to be ignored on the initiator node, otherwise th e subsequent FEC validation will be wrong. This need to supplement and further clarify the processing. For example, according to RFC8287, when the transit segment node replies the FEC change POP prefix-SID, how does the initiator handle it? Will the single Nil FEC be removed from the FEC stack? When the transit node replies to FEC change PUSH (for example, prefix SID enters the outer RSVP-TE forwarding adjacency), how does the initiator handle it? Will RSVP FEC be added to the FEC stack? This issue seems to also exist in non segment routing case, such as traceroute a BGP LU LSP, assuming LU over LDP, but the initiator only inserts a single BGP-LU FEC in the FEC stack. When the echo request packet arrives at a transit node of LDP LSP, it found that it need to enter an outer uniform RSVP-TE LSP. At this time, if the transit node replys FEC change PUSH RSVP FEC, it will bring risk, because the FEC stack of the next echo request is , while the label stack of DDMAP is < BGP, LDP, RSVP >, I doubt whether the subsequent reply of "IS egress" of TE LSP can successfully remov e the RSVP FEC element from the FEC stack. 5) Others: There is a spelling error in the example, egress router R3 should be changed to R7. My conclusion: In Ping mode, egress TLV is useful to be combined with Nil FEC. It offers an alternative to generic IP prefix FEC. Regards, PSF --=====_003_next=====-- --=====_001_next=====-- From nobody Sat Jun 12 05:20:52 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EAD213A0FEE; Sat, 12 Jun 2021 05:20:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.797 X-Spam-Level: X-Spam-Status: No, score=-2.797 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=yUnxyCEt; dkim=pass (1024-bit key) header.d=juniper.net header.b=TSP99Yxp Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 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IHJvdXRlciBSMyBzaG91bGQgYmUgY2hhbmdlZCB0byBSNy4NCg0KTXkgY29uY2x1c2lvbjogSW4g UGluZyBtb2RlLCBlZ3Jlc3MgVExWIGlzIHVzZWZ1bCB0byBiZSBjb21iaW5lZCB3aXRoIE5pbCBG RUMuIEl0IG9mZmVycyBhbiBhbHRlcm5hdGl2ZSB0byBnZW5lcmljIElQIHByZWZpeCBGRUMuDQoN ClJlZ2FyZHMsDQpQU0YNCg== From nobody Sun Jun 13 17:20:08 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F2093A167A; Sun, 13 Jun 2021 17:20:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Cl1pbGN8778x; Sun, 13 Jun 2021 17:20:01 -0700 (PDT) Received: from mxus.zteusa.com (mxus.zteusa.com [4.14.134.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B8DD3A1679; Sun, 13 Jun 2021 17:19:59 -0700 (PDT) Received: from mse-us.zte.com.cn (unknown [10.36.11.29]) by Forcepoint Email with ESMTPS id C725A65D55A2CABFE0DE; Mon, 14 Jun 2021 08:19:58 +0800 (CST) Received: from mgapp02.zte.com.cn ([10.36.9.143]) by mse-us.zte.com.cn with SMTP id 15E0Js9b016837; Mon, 14 Jun 2021 08:19:54 +0800 (GMT-8) (envelope-from gregory.mirsky@ztetx.com) Received: from mapi (mgapp01[null]) by mapi (Zmail) with MAPI id mid81; Mon, 14 Jun 2021 08:19:54 +0800 (CST) Date: Mon, 14 Jun 2021 08:19:54 +0800 (CST) X-Zmail-TransId: 2af960c6a0aa639c007e X-Mailer: Zmail v1.0 Message-ID: <202106140819542507138@zte.com.cn> Mime-Version: 1.0 From: To: Cc: , , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-us.zte.com.cn 15E0Js9b016837 Archived-At: Subject: Re: [mpls] =?utf-8?q?I-D_Action=3A_draft-ninan-mpls-spring-inter-dom?= =?utf-8?q?ain-oam-03=2Etxt?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jun 2021 00:20:06 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Shraddha and Authors, thank you for updating the draft. I've reviewed the new version and couldn't find most of my comments addressed. Could you kindly help by pointing to the specific changes in the draft that, in your opinion, address my comments @ https://mailarchive.ietf.org/arch/msg/mpls/wmd0wbToaCEtDhgd2gFcX2HzG90/ ? As I've noted, I am not sure what is referred to as "the control plane" in the draft in describing the solution defined in RFC 7743. RFC 7743 itself does not, as I understand it, require that an Echo Reply is sent to the control plane at any step. If you have an implementation that does that, perhaps we can look at whether that is indeed the property of the solution or is implementation-specific. Also, I'm still concern with the specification for traceroute mode in the draft. I have a couple of additional notes to add: - RFC 7110, as well as RFC 7743 (I've pointed that out in my first comments), has traceroute outside the scope; - RFC 8029 (Section 4.3) recommends using the Downstream Detailed Mapping TLV. I couldn't find that TLV being mentioned in the draft. If you believe that TLV must not be used, could you list reasons for not using the Downstream Detailed Mapping TLV? Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn ------------------Original Mail------------------ Sender: ShraddhaHegde To: mpls@ietf.org;i-d-announce@ietf.org ;Mach Chen;gregory mirsky10211915;adrian@olddog.co.uk;huubatwork@gmail.com; Date: 2021/06/11 01:34 Subject: RE: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt Hi All, New version of draft-ninan-mpls-spring-inter-domain-oam is posted addressing comments from MPLS-RT review. Pls take a look and let me know if you have further comments. Rgds Shraddha Juniper Business Use Only -----Original Message----- From: mpls On Behalf Of internet-drafts@ietf.org Sent: Friday, June 11, 2021 2:00 PM To: i-d-announce@ietf.org Cc: mpls@ietf.org Subject: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt [External Email. Be cautious of content] A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiprotocol Label Switching WG of the IETF. Title : PMS/Head-end based MPLS Ping and Traceroute in Inter-domain SR Networks Authors : Shraddha Hegde Kapil Arora Mukul Srivastava Samson Ninan Nagendra Kumar Filename : draft-ninan-mpls-spring-inter-domain-oam-03.txt Pages : 21 Date : 2021-06-11 Abstract: Segment Routing (SR) architecture leverages source routing and tunneling paradigms and can be directly applied to the use of a Multiprotocol Label Switching (MPLS) data plane. A network may consist of multiple IGP domains or multiple ASes under the control of same organization. It is useful to have the LSP Ping and traceroute procedures when an SR end-to-end path spans across multiple ASes or domains. This document describes mechanisms to facilitae LSP ping and traceroute in inter-AS/inter-domain SR networks in an efficient manner with simple OAM protocol extension which uses dataplane forwarding alone for sending echo reply. The IETF datatracker status page for this draft is: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ninan-mpls-spring-inter-domain-oam/__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5TuJNnI5{0}lt;br> There is also an htmlized version available at: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ninan-mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5VMFXpJm{0}lt;br> A diff from the previous version is available at: https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=draft-ninan-mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5QEnIeV0{0}lt;br> Internet-Drafts are also available by anonymous FTP at: https://urldefense.com/v3/__ftp://ftp.ietf.org/internet-drafts/__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5T0hqLuk{0}lt;br> _______________________________________________ mpls mailing list mpls@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/mpls__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5TdmWWCx{0}lt;br> --=====_003_next=====-- --=====_001_next=====-- From nobody Mon Jun 14 06:56:02 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 405993A254A for ; Mon, 14 Jun 2021 06:56:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RrgkBWPp565m for ; Mon, 14 Jun 2021 06:55:56 -0700 (PDT) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7D49E3A2548 for ; Mon, 14 Jun 2021 06:55:56 -0700 (PDT) Received: from fraeml710-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4G3XmB5WD2z6G8tf for ; Mon, 14 Jun 2021 21:46:18 +0800 (CST) Received: from fraeml715-chm.china.huawei.com (10.206.15.34) by fraeml710-chm.china.huawei.com (10.206.15.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Mon, 14 Jun 2021 15:55:53 +0200 Received: from fraeml715-chm.china.huawei.com ([10.206.15.34]) by fraeml715-chm.china.huawei.com ([10.206.15.34]) with mapi id 15.01.2176.012; Mon, 14 Jun 2021 15:55:53 +0200 From: Italo Busi To: "'mpls@ietf.org'" Thread-Topic: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec Thread-Index: AddhI9L1yOOS4MxaRt24LmA/Qqe0iA== Date: Mon, 14 Jun 2021 13:55:53 +0000 Message-ID: Accept-Language: it-IT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.88.127] Content-Type: multipart/alternative; boundary="_000_fa5f1e295e0946c5928613f49e24bddfhuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [mpls] MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Jun 2021 13:56:00 -0000 --_000_fa5f1e295e0946c5928613f49e24bddfhuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, I have been selected as one of the MPLS-RT reviewers of draft-rathi-mpls-e= gress-tlv-for-nil-fec-04 IMHO, being able to use LSP Ping/Traceroute perform to validate only the da= ta path and not the control plane state makes sense but I think that the dr= aft requires more information about the problem that it is trying to addres= s and why existing solutions are not suitable Let me try to clarify my confusion after having read the draft Unless I am missing something, section 4.4.1 of RFC8029 already provides su= pport for checking only the data path and not the control plane state: If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely. The draft mention some challenges with the current definition, but it seems= describing only one potential issue: ... When router in the label-stack path receives MPLS ping/traceroute packets, there is no definite way to decide on whether its egress or transit since Nil FEC does not carry any information. However, I am not sure about this issue: looking at the example in the draf= t, my understanding is that R7 will reply with code 3 while, in traceroute,= the intermediate nodes will reply with code 8. Reading the procedure in section 4.2, I am wondering whether the real inten= tion is to be able to validate the prefix X in R7, rather than the SR path = toward R7. However, in this case, it is not clear why using a FEC for the prefix X ins= tead of the Nil FEC is not suitable. I also think that section 5 requires more details about how backward compat= ibility is achieved. What is the behavior of a node that does not support t= his solution when it receives the EGRESS TLV? Italo --_000_fa5f1e295e0946c5928613f49e24bddfhuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

I have been selected as one of the  MPLS-RT rev= iewers of draft-rathi-mpls-egress-tlv-for-nil-fec-04

 

IMHO, being able to use LSP Ping/Traceroute perform = to validate only the data path and not the control plane state makes sense = but I think that the draft requires more information about the problem that= it is trying to address and why existing solutions are not suitable

 

Let me try to clarify my confusion after having read= the draft

Unless I am missing something, section 4.4.1 of RFC8= 029 already provides support for checking only the data path and not the co= ntrol plane state:

 

   If the outermost FEC of the Target FEC = stack is the Nil FEC, then the

   node MUST skip the Target FEC validatio= n completely.

 

The draft mention some challenges with the current d= efinition, but it seems describing only one potential issue:

 

   ... When router in the label-stack path=

   receives MPLS ping/traceroute packets, = there is no definite way to

   decide on whether its egress or transit= since Nil FEC does not carry

   any information.

 

However, I am not sure about this issue: looking at = the example in the draft, my understanding is that R7 will reply with code = 3 while, in traceroute, the intermediate nodes will reply with code 8.=

 

Reading the procedure in section 4.2, I am wondering= whether the real intention is to be able to validate the prefix X in R7, r= ather than the SR path toward R7.

 

However, in this case, it is not clear why using a F= EC for the prefix X instead of the Nil FEC is not suitable.

 

I also think that section 5 requires more details ab= out how backward compatibility is achieved. What is the behavior of a node = that does not support this solution when it receives the EGRESS TLV?

 

Italo

 

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--_007_BN6PR05MB3569A9553DD5E449ED5B203AD5309BN6PR05MB3569namp_-- From nobody Tue Jun 15 04:28:09 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 643183A29B8; Tue, 15 Jun 2021 04:28:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Hv6-19OKycV7; Tue, 15 Jun 2021 04:28:01 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 719BC3A2BF9; Tue, 15 Jun 2021 04:28:01 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 573C73488CD; Tue, 15 Jun 2021 13:27:58 +0200 (CEST) From: Loa Andersson To: "mpls@ietf.org" Cc: "mpls-chairs@ietf.org" , "pals-chairs@ietf.org" , "spring-chairs@ietf.org" , DetNet Chairs Message-ID: <6cd2c4e4-a576-6815-d15f-c34b491fd19d@pi.nu> Date: Tue, 15 Jun 2021 13:27:24 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Soliciting agenda items for the upcoming Open DT on Thursday (2021-06-17) X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2021 11:28:08 -0000 Design team, The Open Design Team meeting on Thursday (2021-06-17) will focus on discussing two Extension Header drafts. Haouy will lead the discussion. Please find the tentative agenda: https://trac.ietf.org/trac/mpls/wiki/2021-06-17-agenda If time allows we will return an item brought up at the end of the last meeting, see mail from Loa 2021-06+15, the issues is multiple instances of indicators in the stack and multiple set of ancillary data after the boss. The discuss is not so much on how the problem could be solved, but on what the requirements are. We are also soliciting other issues to be discussed at this meeting or a coming meeting. /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Tue Jun 15 05:31:37 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8ACED3A2DF9 for ; Tue, 15 Jun 2021 05:31:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eAon49TOECJW for ; Tue, 15 Jun 2021 05:31:31 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D10CF3A2DF7 for ; Tue, 15 Jun 2021 05:31:30 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 3234E3488CF for ; Tue, 15 Jun 2021 14:31:23 +0200 (CEST) From: Loa Andersson To: "mpls@ietf.org" Message-ID: Date: Tue, 15 Jun 2021 14:31:22 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2021 12:31:36 -0000 Design Team, When the Associated Channel first were desing it was assume that one associated channel per packet would be enough for the future. The rules for where the GAL (indicator for an associated channel) should be located in the stack and that there could only be one GAL in the stack was strictly specified. Now we are where the development has taken us to a point where the GAL can be found aqt almost any position in the stack. Further changes are discussed. - As label stack has been growing there is a risk that some LSRs that need to find the GAL might find that the GAL is below readable depth. The proposed remedy is to allow entering a copy of the first GAL higher in the stack, i.e. more than one GAL in the stack point to the same ACH. - It has also been discussed to carry more than one ACH after the BoS, i.e. you'll need more than one different GALs in the stack pointing to different ACH's. (I think the if this statement is true that would require a "slight", but backwards compatible redesign of the GAL.) - It has also been discussed to carry more then set of (the ACH is one) ancillary data after the BoS, and e.g. FAI, GAL, EHI, OAM indicator, etc. mixed in the label stack. The issue is that the set of ancillary data after the BoS might will interfere and that we need a strong mechanism to find the ancillary data that "belongs to" a certain indicator. I think that we first need to decide what is required and after that design a solution. The correctness of statements about need to be verified and if necessary corrected. /Loa PS Can someone tell me if I should use anxillary or ancillary? -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Tue Jun 15 06:08:41 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 04A8C3A2FBB for ; Tue, 15 Jun 2021 06:08:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.09 X-Spam-Level: X-Spam-Status: No, score=-2.09 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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boundary="_000_MW4PR03MB639576D1C4B872AA0F5A8553F6309MW4PR03MB6395namp_" MIME-Version: 1.0 X-OriginatorOrg: rbbn.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MW4PR03MB6395.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 24b279fa-950d-4baf-b122-08d92ffea8e7 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jun 2021 13:08:25.0007 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 29a671dc-ed7e-4a54-b1e5-8da1eb495dc3 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: E2QolTghZW0nunsHPXnn59UHEM4s0tt2SmUDo929yahy9KUAaAhGW4d1z3hQmLUM0eXDURxZtFMeNLoKw76Cug== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO2PR03MB2229 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2021 13:08:39 -0000 --_000_MW4PR03MB639576D1C4B872AA0F5A8553F6309MW4PR03MB6395namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Loa and all, I have to admit that I have not been following the work of the DT closely = for the last month or so. Therefore I may be asking some questions that have already been asked and = even answered. In which case you can simply say so(hopefully with some ref= erence). However I still think these questions should be asked. Please see these questions - with some clarifications - inline below. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: mpls On Behalf Of Loa Andersson Sent: Tuesday, June 15, 2021 3:31 PM To: mpls@ietf.org Subject: [EXTERNAL] [mpls] Indicators in the stack and ancillary data afte= r the BoS Design Team, When the Associated Channel first were desing it was assume that one assoc= iated channel per packet would be enough for the future. [[Sasha]] Actually the initial GACh design (RFC 5586) has provided for a TLV to follow the GACh fixed= header, with the provision that the presence of such a TLV is inferred fr= om the GACh type in the fixed header. However, this mechanism has never be= en used, and eventually GACh TLVs have been retired (RFC 7026). I wonder if the need for multiple GACh in a packet could be addressed by G= ACh TLVs? The rules for where the GAL (indicator for an associated channel) should b= e located in the stack and that there could only be one GAL in the stack w= as strictly specified. [[Sasha]] GAL has been restricted to be just the BoS label in the MPLS-TP = environments, but this restriction does not apply "to other environments"= . However, I am not aware of any rules for handling GAL if it is exposed to = the MPLS forwarder (i.e. becomes top of the stack) while being followed by= some other labels. RFC 5586 only says that "A receiving LSR, LER, or PE M= UST NOT forward a G-ACh packet to another node based on the GAL label". T= his is quite different from the definition of handling for the Routing Ale= rt label. From my POV: * Lack of these definitions effectively precludes usage of GAL in = a non-BoS position * Any such definition, if introduced today, will not be backward c= ompatible with the existing implementations. Now we are where the development has taken us to a point where the GAL can= be found at almost any position in the stack. [[Sasha]] Please see my previous comment. Further changes are discussed. - As label stack has been growing there is a risk that some LSRs that need to find the GAL might find that the GAL is below readable depth. The proposed remedy is to allow entering a copy of the first GAL higher in the stack, i.e. more than one GAL in the stack point to the same ACH.[[Sasha]] The LSR normally looks just at the top label in the = stack. If GAL is not in the top position, why should it react to it? And i= f it is in the top position but not BoS, how will the packet be forwarded?= In addition, GAL does not "point to an ACH". It says that ACH immediately= follows the BoS label, so I fail to understand how a GAL can point to a s= pecific ACH. - It has also been discussed to carry more than one ACH after the BoS, i.e. you'll need more than one different GALs in the stack pointing to different ACH's.[[Sasha]] By different GALs do you mean different reser= ved - or extended reserved - label values? (I think the if this statement is true that would require a "slight", but backwards compatible redesign of the GAL.) - It has also been discussed to carry more then set of (the ACH is one) ancillary data after the BoS, and e.g. FAI, GAL, EHI, OAM indicator, etc. mixed in the label stack. The issue is that the set of ancillary data after the BoS might will inter= fere and that we need a strong mechanism to find the ancillary data that "= belongs to" a certain indicator. I think that we first need to decide what is required and after that desig= n a solution. The correctness of statements about need to be verified and if necessary c= orrected. /Loa PS Can someone tell me if I should use anxillary or ancillary? -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 _______________________________________________ mpls mailing list mpls@ietf.org https://clicktime.symantec.com/389rPq1ADpF9WRstEF2jdmj6H2?u=3Dhttps%3A%2F%= 2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. --_000_MW4PR03MB639576D1C4B872AA0F5A8553F6309MW4PR03MB6395namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Loa and all,

I have to admit that I have not been following t= he work of the DT closely for the last month or so.

Therefore I may be asking some questions that ha= ve already been asked and even answered. In which case you can simply say = so(hopefully with some reference).

However I still think these questions should be = asked.

Please see these questions – with some cla= rifications – inline below.

 

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      +972-5492663= 02

Email:   Alexander.Vainshtein@rbbn.com=

 

-----Original Message-----
From: mpls <mpls-bounces@ietf.org> On Behalf Of Loa Andersson
Sent: Tuesday, June 15, 2021 3:31 PM
To: mpls@ietf.org
Subject: [EXTERNAL] [mpls] Indicators in the stack and ancillary data afte= r the BoS

 

Design Team,

 

When the Associated Channel first were desing it= was assume that one associated channel per packet would be enough for the= future.

[[Sasha]] Ac= tually the initial GACh design (RFC 5586) has pro= vided for a TLV to follow the GACh fixed header, with the provision that the presence of such a TLV is inferred from the G= ACh type in the fixed header. However, this mechanism has never been used,= and eventually GACh TLVs have been retired (RFC 7026).

I wonder if = the need for multiple GACh in a packet could be addressed by GACh TLVs?

 

The rules for where the GAL (indicator for an as= sociated channel) should be located in the stack and that there could only= be one GAL in the stack was strictly specified.

[[Sasha]] GA= L has been restricted to be just the BoS label in the MPLS-TP environments= , but this restriction does not apply  “to other environments&#= 8221;.

However, I a= m not aware of any rules for handling GAL if it is exposed to the MPLS for= warder (i.e. becomes top of the stack) while being followed by some other = labels. RFC 5586 only says that “A receiving LSR, LER, or PE MUST NOT forward a G-ACh packet to  anothe= r node based on the GAL labelR= 21;. This is quite different from the defi= nition of handling for the Routing Alert label. From my POV:

·         Lack of these definitions effectively precludes usage of G= AL in a non-BoS position=

·         Any such definition, if introduced today, will not be back= ward compatible with the existing implementations.

 

Now we are where the development has taken us to= a point where the GAL can be found at almost any position in the stack.

[[Sasha]] Pl= ease see my previous comment.=

 

Further changes are discussed.

 

- As label stack has been growing there is a ris= k that some LSRs that

   need to find the GAL might find tha= t the GAL is below readable depth.

   The proposed remedy is to allow ent= ering a copy of the first GAL

   higher in the stack, i.e. more than= one GAL in the stack point to the

   same ACH.[[Sasha]] The LSR normally looks just at the top label in the st= ack. If GAL is not in the top position, why should it react to it? And if = it is in the top position but not BoS, how will the packet be forwarded? In addition, GAL does not “point to an ACHR= 21;. It says that ACH immediately follows the BoS label, so I fail to unde= rstand how a GAL can point to a specific ACH.

 

- It has also been discussed to carry more than = one ACH after the BoS,

   i.e. you'll need more than one diff= erent GALs in the stack pointing to

   different ACH's.[[Sasha]] By different GALs do you mean different reserve= d – or extended reserved – label values?

   (I think the if this statement= is true that would require a "slight",

   but backwards compatible redesign o= f the GAL.)

 

- It has also been discussed to carry more then = set of (the ACH is one)

   ancillary data after the BoS, and e= .g. FAI, GAL, EHI, OAM indicator,

   etc. mixed in the label stack.=

 

The issue=20is that the set of ancillary data af= ter the BoS might will interfere and that we need a strong mechanism to fi= nd the ancillary data that "belongs to" a certain indicator.

 

I think that we first need to decide what is req= uired and after that design a solution.

 

The correctness of statements about need to be v= erified and if necessary corrected.

 

/Loa

 

PS

 

Can someone tell me if I should use anxillary or= ancillary?

 

 

--

 

Loa Andersson      = ;            &= nbsp;     email: loa@pi.nu=

Senior MPLS Expert     =             &n= bsp;        loa.pi.nu@gmail.com<= /span>

Bronze Dragon Consulting    =          phone: +46 739 81 21 64

 

_______________________________________________<= o:p>

mpls mailing list

mpls@ietf.org=

https://click= time.symantec.com/389rPq1ADpF9WRstEF2jdmj6H2?u=3Dhttps%3A%2F%2Fwww.ietf.or= g%2Fmailman%2Flistinfo%2Fmpls

 

Notice: This e-mail together with any attachment= s may contain information of Ribbon Communications Inc. and its Affiliates= that is confidential and/or proprietary for the sole use of the intended = recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is str= ictly prohibited. If you are not the intended recipient, please notify the= sender immediately and then delete all copies, including any attachments.=


Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments.
--_000_MW4PR03MB639576D1C4B872AA0F5A8553F6309MW4PR03MB6395namp_-- From nobody Tue Jun 15 07:44:04 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 114613A32A3 for ; Tue, 15 Jun 2021 07:44:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EQaA4tv_ewI3 for ; Tue, 15 Jun 2021 07:43:57 -0700 (PDT) Received: from mx03.uni-tuebingen.de (mx03.uni-tuebingen.de [134.2.5.213]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 91DA63A3296 for ; Tue, 15 Jun 2021 07:43:55 -0700 (PDT) Received: from [134.2.72.29] (uni-vpn29.vpn.uni-tuebingen.de [134.2.72.29]) by mx03.uni-tuebingen.de (Postfix) with ESMTPSA id 9115F21060D6; Tue, 15 Jun 2021 16:43:51 +0200 (CEST) To: Kireeti Kompella Cc: mpls@ietf.org, Daniel Merling , Vladimir Gurevich , Steffen Lindner References: From: Michael Menth Message-ID: <850d0b17-538c-a326-ed90-890b78031517@uni-tuebingen.de> Date: Tue, 15 Jun 2021 16:43:52 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] NFFRR X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Jun 2021 14:44:03 -0000 Dear Kireeti, our follow-up work "Robust LFA Protection for Software-DefinedNetworks (RoLPS)" got accepted for IEEE Transactions on Network and Service Management: https://atlas.informatik.uni-tuebingen.de/~menth/papers/Menth21e.pdf It is related to NFFRR because it defines advanced loop detection (ALD) and avoidance in a simple manner. The concept is now implemented on the P4-programmable Tofino target. Section VII.C reports about an experiment to demonstrate how the prototype avoids loops. This new version (ALD) is more straightforward than the old version (ALDT) because we did not restrict ourselves to the (missing) capabilities of OpenFlow anymore, P4 is more flexible. You cited ALDT in your draft: https://datatracker.ietf.org/doc/html/draft-kompella-mpls-nffrr-01#section-1.1 Yes, we think that some sort of that mechanism makes sense, especially in controller-based networks. Kind regards, Michael Am 02.11.2020 um 16:19 schrieb Kireeti Kompella: > Hi Michael, > > Thanks for the link to the paper.  It is cool that both attack > the problem of loops due to multiple failures (real or perceived). > > While the goals are similar, there are clearly differences in the > approach because of different assumptions.  ALDT attempts to minimize > false discards, at the expense of higher packet and processing > overhead.  The NFFRR approach is far more naive, but also far more > efficient.  It would be interesting to see how often NFFRR discards > packets erroneously in different topologies, as opposed to LDT or ALDT.  > The trade-offs between efficiency and correctness are harder to determine. > > Sprinkled in the referenced paper in multiple places are limitations due > to OpenFlow.  P4 is a better base for prototyping. > > One question: how is an LD label recognized as such? > > Thanks too for the reference to the Topology Zoo.  The topologies I > sampled were pretty small, though. > > > On Thu, Sep 17, 2020 at 8:01 AM Michael Menth > wrote: > > Hi Kireeti, all, > > interesting to see this in MPLS. We've done a similar feature (Advanced > Loop Detection and Termination, ALDT) for destination-based forwarding > with LFAs and did some evaluations: > > D. Merling, W. Braun, and M. Menth: Efficient Data Plane Protection for > SDN, in Proceedings of the 4th IEEE Conference on Network Softwarization > (NetSoft), June 2018, Montreal, Canada. > https://atlas.informatik.uni-tuebingen.de/~menth/papers/Menth18g.pdf > > > We've implemented a prototype on the P4-based Tofino from barefoot, a > paper is to come. > > Regards, > > Michael > > Am 17.09.2020 um 16:27 schrieb Kireeti Kompella: > > Hi All, > > > > We have a prototype implementation of NFFRR in Junos.  The packet > > forwarding code was easier to write using a well-known SPL rather > than a > > configured or signaled label.  This implementation is specifically for > > the EVPN multihoming case -- to prevent loops if the CE is down rather > > than a link to the CE, but the principle is the same for other > NFFRR cases. > > > > Given that, and the fact that the problem is real, the solution > > implemented and the draft reasonably comprehensive and stable, the > > authors request WG adoption. > > > > -- > > Kireeti > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://www.ietf.org/mailman/listinfo/mpls > > > > > -- > Prof. Dr. habil. Michael Menth > University of Tuebingen > Faculty of Science > Department of Computer Science > Chair of Communication Networks > Sand 13, 72076 Tuebingen, Germany > phone: (+49)-7071/29-70505 > fax: (+49)-7071/29-5220 > mailto:menth@uni-tuebingen.de > http://kn.inf.uni-tuebingen.de > > > > -- > Kireeti -- Prof. Dr. habil. Michael Menth University of Tuebingen Faculty of Science Department of Computer Science Chair of Communication Networks Sand 13, 72076 Tuebingen, Germany phone: (+49)-7071/29-70505 fax: (+49)-7071/29-5220 mailto:menth@uni-tuebingen.de http://kn.inf.uni-tuebingen.de From nobody Wed Jun 16 12:24:09 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C8E423A23C1 for ; Wed, 16 Jun 2021 12:24:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hz_hDPlns7ow for ; Wed, 16 Jun 2021 12:24:02 -0700 (PDT) Received: from mxus.zteusa.com (mxus.zteusa.com [4.14.134.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AAD243A23C0 for ; Wed, 16 Jun 2021 12:24:02 -0700 (PDT) Received: from mse-us.zte.com.cn (unknown [10.36.11.29]) by Forcepoint Email with ESMTPS id 726101A4130958F52B49; Thu, 17 Jun 2021 03:24:01 +0800 (CST) Received: from mgapp02.zte.com.cn ([10.36.9.143]) by mse-us.zte.com.cn with SMTP id 15GJNtkZ046771; Thu, 17 Jun 2021 03:23:55 +0800 (GMT-8) (envelope-from gregory.mirsky@ztetx.com) Received: from mapi (mgapp01[null]) by mapi (Zmail) with MAPI id mid81; Thu, 17 Jun 2021 03:23:55 +0800 (CST) Date: Thu, 17 Jun 2021 03:23:55 +0800 (CST) X-Zmail-TransId: 2af960ca4fcb2ca5cc73 X-Mailer: Zmail v1.0 Message-ID: <202106170323552620410@zte.com.cn> In-Reply-To: References: c7d696de-4d83-6e3b-7d10-dc787fdabc73@pi.nu, MW4PR03MB639576D1C4B872AA0F5A8553F6309@MW4PR03MB6395.namprd03.prod.outlook.com Mime-Version: 1.0 From: To: Cc: , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-us.zte.com.cn 15GJNtkZ046771 Archived-At: Subject: Re: [mpls] =?utf-8?q?=5BEXTERNAL=5D_Indicators_in_the_stack_and_anci?= =?utf-8?q?llary_data_after_the_BoS?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jun 2021 19:24:08 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Sasha, I agree with all your comments regarding the GAL. Indeed, GAL in non-MPLS-TP environments may be placed anywhere in a label stack. But how an LSR acts in the case GAL is not BoS has been left under-defined in RFC 5586. As I understand it, you are concerned that any work on closing that gap would not be backward compatible with the existing implementations handling GAL. While that might be the case, I think that the Open DT may give it a try and investigate how the existing systems will handle GAL being not the BoS label. Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn ------------------Original Mail------------------ Sender: AlexanderVainshtein To: Loa Andersson; CC: mpls@ietf.org; Date: 2021/06/15 06:09 Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS _______________________________________________ mpls mailing list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls Loa and all, I have to admit that I have not been following the work of the DT closely for the last month or so. Therefore I may be asking some questions that have already been asked and even answered. In which case you can simply say so(hopefully with some reference). However I still think these questions should be asked. Please see these questions – with some clarifications – inline below. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: mpls On Behalf Of Loa Andersson Sent: Tuesday, June 15, 2021 3:31 PM To: mpls@ietf.org Subject: [EXTERNAL] [mpls] Indicators in the stack and ancillary data after the BoS Design Team, When the Associated Channel first were desing it was assume that one associated channel per packet would be enough for the future. [[Sasha]] Actually the initial GACh design (RFC 5586) has provided for a TLV to follow the GACh fixed header, with the provision that the presence of such a TLV is inferred from the GACh type in the fixed header. However, this mechanism has never been used, and eventually GACh TLVs have been retired (RFC 7026). I wonder if the need for multiple GACh in a packet could be addressed by GACh TLVs? The rules for where the GAL (indicator for an associated channel) should be located in the stack and that there could only be one GAL in the stack was strictly specified. [[Sasha]] GAL has been restricted to be just the BoS label in the MPLS-TP environments, but this restriction does not apply “to other environments”. However, I am not aware of any rules for handling GAL if it is exposed to the MPLS forwarder (i.e. becomes top of the stack) while being followed by some other labels. RFC 5586 only says that “A receiving LSR, LER, or PE MUST NOT forward a G-ACh packet to another node based on the GAL label”. This is quite different from the definition of handling for the Routing Alert label. From my POV: · Lack of these definitions effectively precludes usage of GAL in a non-BoS position · Any such definition, if introduced today, will not be backward compatible with the existing implementations. Now we are where the development has taken us to a point where the GAL can be found at almost any position in the stack. [[Sasha]] Please see my previous comment. Further changes are discussed. - As label stack has been growing there is a risk that some LSRs that need to find the GAL might find that the GAL is below readable depth. The proposed remedy is to allow entering a copy of the first GAL higher in the stack, i.e. more than one GAL in the stack point to the same ACH.[[Sasha]] The LSR normally looks just at the top label in the stack. If GAL is not in the top position, why should it react to it? And if it is in the top position but not BoS, how will the packet be forwarded? In addition, GAL does not “point to an ACH”. It says that ACH immediately follows the BoS label, so I fail to understand how a GAL can point to a specific ACH. - It has also been discussed to carry more than one ACH after the BoS, i.e. you'll need more than one different GALs in the stack pointing to different ACH's.[[Sasha]] By different GALs do you mean different reserved – or extended reserved – label values? (I think the if this statement is true that would require a "slight", but backwards compatible redesign of the GAL.) - It has also been discussed to carry more then set of (the ACH is one) ancillary data after the BoS, and e.g. FAI, GAL, EHI, OAM indicator, etc. mixed in the label stack. The issue is that the set of ancillary data after the BoS might will interfere and that we need a strong mechanism to find the ancillary data that "belongs to" a certain indicator. I think that we first need to decide what is required and after that design a solution. The correctness of statements about need to be verified and if necessary corrected. /Loa PS Can someone tell me if I should use anxillary or ancillary? -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 _______________________________________________ mpls mailing list mpls@ietf.org https://clicktime.symantec.com/389rPq1ADpF9WRstEF2jdmj6H2?u=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls Notice: This e-mail together with any attachments may contain information of Ribbon Communications Inc. and its Affiliates that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments. Notice: This e-mail together with any attachments may contain information of Ribbon Communications Inc. and its Affiliates that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments. --=====_003_next=====-- --=====_001_next=====-- From nobody Wed Jun 16 23:45:30 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 623453A0E0D for ; Wed, 16 Jun 2021 23:45:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.08 X-Spam-Level: X-Spam-Status: No, score=-2.08 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=rbbn.com 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a8mr3830198wri.11.1623915363527; Thu, 17 Jun 2021 00:36:03 -0700 (PDT) Received: from [192.168.8.179] ([85.255.236.232]) by smtp.gmail.com with ESMTPSA id m126sm7122646wmm.17.2021.06.17.00.36.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 17 Jun 2021 00:36:03 -0700 (PDT) From: Stewart Bryant Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_AD7343E4-5AA2-42F7-9A25-37A6114176AE" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.6\)) Date: Thu, 17 Jun 2021 08:35:58 +0100 In-Reply-To: Cc: Stewart Bryant , "gregory.mirsky@ztetx.com" , "mpls@ietf.org" To: Alexander Vainshtein References: <202106170323552620410@zte.com.cn> X-Mailer: Apple Mail (2.3608.120.23.2.6) Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 07:36:12 -0000 --Apple-Mail=_AD7343E4-5AA2-42F7-9A25-37A6114176AE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 17 Jun 2021, at 07:45, Alexander Vainshtein = wrote: >=20 > While that might be the case, I think that the Open DT may give it a = try and investigate how the existing systems will handle GAL being not = the BoS label. > [[Sasha]] Great minds think alike! One useful step could be collecting = the known actual behavior of popular implementations in this case, say, = by running a survey among the vendors =E2=80=93 what do you think? That is actually a considerable amount of work that will take a while. It seems to me that an old implementation that received a ToS GAL not at = BoS would at best throw an exception or worst be unpredictable. The original assumed processing model is to take the context of the PW = label or PW+FAT label, discover the GAL and then process the GAL in the = context of the PW label. When we extended GAL to apply to LSPs we again had the model that the = GAL operated in the context of the LSP label that preceded it for = context. It was still BoS. Putting the GAL further up the stack is a new behaviour. If it arrives at an LSR that knows the new semantic all is good. If it arrives at an LSR that does not know the new semantic then=20 a) An error has occurred either in setting up the LSP, or in forwarding. b) The behaviour at the receiving node is unpredictable, but in any well = written implementation should just result in the packet being dropped = and counted as with any other Mal-formed packet. So I would think that it is OK to have multiple GALs and GALs not at BoS = IFF the creator of the LSP ensured that all LSRs on the LSP, including = ECMP and FRR paths that found the GAL at ToS were known to be able to = process it correctly. A GAL not at BoS and not at ToS should not be inspected or processed by = any LSR that did not know what it was doing, and to attempt to precess = it would be a violation of the normal MPLS processing model. - Stewart --Apple-Mail=_AD7343E4-5AA2-42F7-9A25-37A6114176AE Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On 17 Jun 2021, at 07:45, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> wrote:

While that might be the case, I think that the Open DT = may give it a try and investigate how the existing systems will handle = GAL being not the BoS label.
[[Sasha]] Great minds = think alike! One useful step could be collecting the known actual = behavior of popular implementations in this case, say, by running a = survey among the vendors =E2=80=93 what do you = think?


That is actually a = considerable amount of work that will take a while.

It seems to me that an = old implementation that received a ToS GAL not at BoS would at best = throw an exception or worst be unpredictable.

The original assumed processing model = is to take the context of the PW label or PW+FAT label, discover the GAL = and then process the GAL in the context of the PW label.

When we extended GAL to = apply to LSPs we again had the model that the GAL operated in the = context of the LSP label that preceded it for context. It was still = BoS.

Putting = the GAL further up the stack is a new behaviour.

If it arrives at an LSR that knows the = new semantic all is good.

If it arrives at an LSR that does not know the new semantic = then 

a) = An error has occurred either in setting up the LSP, or in = forwarding.

b) = The behaviour at the receiving node is unpredictable, but in any well = written implementation should just result in the packet being dropped = and counted as with any other Mal-formed packet.

So I would think that it is OK to have = multiple GALs and GALs not at BoS IFF the creator of the LSP ensured = that all LSRs on the LSP, including ECMP and FRR paths that found the = GAL at ToS were known to be able to process it correctly.

A GAL not at BoS and not = at ToS should not be inspected or processed by any LSR that did not know = what it was doing, and to attempt to precess it would be a violation of = the normal MPLS processing model.

- Stewart


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13:37:36 +0000 From: Deepti Rathi To: Italo Busi CC: "draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org" , "mpls-chairs@ietf.org" , "mpls@ietf.org" Thread-Topic: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec Thread-Index: AddhI9L1yOOS4MxaRt24LmA/Qqe0iAAl+X+wAGq/JjAABL76EA== Date: Thu, 17 Jun 2021 13:37:36 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-17T13:37:32Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; 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652pdM5fYT3qMxPrqOsepWuEfFOVLCo3+DP9/QiXM1eay0Dsi6ItwXL2RUSlQKkZtpo/EUlNt4WK5vmCSwZM7A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR05MB4480 X-Proofpoint-ORIG-GUID: uLXHdp3C67dX5AHaAow9dKUmJx9UGdwp X-Proofpoint-GUID: uLXHdp3C67dX5AHaAow9dKUmJx9UGdwp X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-17_10:2021-06-15, 2021-06-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 clxscore=1011 spamscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 bulkscore=0 adultscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106170087 Archived-At: Subject: Re: [mpls] MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 13:37:59 -0000 --_000_SA1PR05MB843989D62791B28BFFF80B52AF0E9SA1PR05MB8439namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Italo, Please find my comments inline. I will update draft for: 1. why "NIL FEC + EGRESS TLV" and not Generic IPV4/IPV6 FEC. 2. Backward compatibility. Regards, Deepti Juniper Business Use Only From: mpls > On Behalf = Of Italo Busi Sent: Monday, June 14, 2021 7:26 PM To: 'mpls@ietf.org' > Subject: [mpls] MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec [External Email. Be cautious of content] Hi all, I have been selected as one of the MPLS-RT reviewers of draft-rathi-mpls-e= gress-tlv-for-nil-fec-04 >>IMHO, being able to use LSP Ping/Traceroute perform to validate only the = data path and not the control plane state makes sense but I think that the = draft requires more information about the problem that >>it is trying to ad= dress and why existing solutions are not suitable [Deepti]: NIL FEC is used to traverse the path without validation for cases where the= FEC is not defined or routers are not upgraded to support the new FECs (li= ke newer features, explicit-null, router-alert etc). But it is a very powerful tool to check any combination of segments on any = data path. Since it does not carry any information to identify the intended egress/des= tination, * Mis-forwarding of the packet is possible * Not possible to figure out mis-configuration of label stack But in any case it will always return success even though egress/destinatio= n is not the intended one which is not desired. To overcome this and to provide minimal validation, EGRESS TLV is added in = the packet. This will help to do egress/destination validation. NIL FEC processing will be same as defined in RFC 8029. This draft is for a= ddition of EGRESS TLV as extension to NIL FEC for path egress/destination v= alidation. >Let me try to clarify my confusion after having read the draft >Unless I am missing something, section 4.4.1 of RFC8029 already provides s= upport for checking only the data path and not the control plane state: > If the outermost FEC of the Target FEC stack is the Nil FEC, then the > node MUST skip the Target FEC validation completely. >The draft mention some challenges with the current definition, but it seem= s describing only one potential issue: > ... When router in the label-stack path > receives MPLS ping/traceroute packets, there is no definite way to > decide on whether its egress or transit since Nil FEC does not carry > any information. >However, I am not sure about this issue: looking at the example in the dra= ft, my understanding is that R7 will reply with code 3 while, in traceroute= , the intermediate nodes will reply with code 8. >Reading the procedure in section 4.2, I am wondering whether the real inte= ntion is to be able to validate the prefix X in R7, rather than the SR path= toward R7. >However, in this case, it is not clear why using a FEC for the prefix X in= stead of the Nil FEC is not suitable. [Deepti]: The real intention is to reach the correct egress/destination nod= e. The details of generic FEC and validation procedures are not very detailed = in the RFC 8029. The use-case mostly specifies inter-AS VPNs as the motivation. Certain aspects of Segment Routing such as anycast SIDs required clear guid= eline on how the validation procedure should work. Also Generic FEC may not be widely supported and if transit routers are not= upgraded to support validation of generic FEC, traceroute may fail. So instead of adding such clarifications to generic FEC, we went with new E= GRESS TLV in Nil FEC. Its an optional TLV so the procedures will work fine even if transit router= s are not upgraded. While we clearly specify the processing of egress tlv so that all SR cases = are well specified. Since explicit path can be created using node-sid, adj-sid, binding-sid, an= ycast-sids etc. EGRESS TLV prefix will be derived from path egress/destinat= ion and not based on labels used in the path to reach the destination. I will update introduction section of draft with this comparison. >>I also think that section 5 requires more details about how backward comp= atibility is achieved. What is the behavior of a node that does not support= this solution when it receives the EGRESS TLV? [Deepti]: Backward compatibility on egress-node: On egress/destination, it will ignore EGRESS TLV and use current NIL-FEC pr= ocedure with return code 3 but egress validation will not be done (same as = RFC 8029). So we wont know for sure if packet has reached the correct path = egress. Backward compatibility on transit-node: If the transit node doesn't support, it will use current NIL-FEC procedure = and send return code of 8. I will add section in draft for backward compatibility. Italo --_000_SA1PR05MB843989D62791B28BFFF80B52AF0E9SA1PR05MB8439namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Hi Italo,

Please find my comments inline.

I will update draft for:

  1. why “NIL FEC + EGRESS TLV” and not Generic IPV4/IPV6 FEC.=
  2. Backward compatibility.

 

Regards,

Deepti

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Italo Busi
Sent: Monday, June 14, 2021 7:26 PM
To: 'mpls@ietf.org' <mpls@ietf.o= rg>
Subject: [mpls] MPLS-RT review for draft-rathi-mpls-egress-tlv-for-n= il-fec

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Hi all,

 

I have been selected as one of the  MPLS-RT rev= iewers of draft-rathi-mpls-egress-tlv-for-nil-fec-04

 

>>IMHO, being able to use LSP Ping/Traceroute = perform to validate only the data path and not the control plane state make= s sense but I think that the draft requires more information about the prob= lem that >>it is trying to address and why existing solutions are not suitable

[Deepti]:

NIL FEC is used to traverse the path without validat= ion for cases where the FEC is not defined or routers are not upgraded to s= upport the new FECs (like newer features, explicit-null, router-alert etc).=

But it is a very powerful tool to check any combinat= ion of segments on any data path.

Since it does not carry any information to identify = the intended egress/destination,

  • Mis-forwarding of the packet is possible
  • Not possible to figure out mis-configuration of label= stack

But in any case it will always return success even t= hough egress/destination is not the intended one which is not desired.=

To overcome this and to provide minimal validation, = EGRESS TLV is added in the packet. This will help to do egress/destination = validation.

NIL FEC processing will be same as defined in RFC 80= 29. This draft is for addition of EGRESS TLV as extension to NIL FEC for pa= th egress/destination validation.

 

>Let me try to clarify my confusion after having = read the draft

 

>Unless I am missing something, section 4.4.1 of = RFC8029 already provides support for checking only the data path and not th= e control plane state:

 

>  If the outermost FEC of the Target FEC st= ack is the Nil FEC, then the

> node MUST skip the Target FEC validation comple= tely.

 

>The draft mention some challenges with the curre= nt definition, but it seems describing only one potential issue:=

 

>   ... When router in the label-stack = path

>   receives MPLS ping/traceroute packe= ts, there is no definite way to

>   decide on whether its egress or tra= nsit since Nil FEC does not carry

>   any information.

 

>However, I am not sure about this issue: looking= at the example in the draft, my understanding is that R7 will reply with c= ode 3 while, in traceroute, the intermediate nodes will reply with code 8.<= o:p>

 

>Reading the procedure in section 4.2, I am wonde= ring whether the real intention is to be able to validate the prefix X in R= 7, rather than the SR path toward R7.

 

>However, in this case, it is not clear why using= a FEC for the prefix X instead of the Nil FEC is not suitable.<= /p>

 

[Deepti]: The real intention is to reach the = correct egress/destination node.

The details of generic FEC and validation procedures= are not very detailed in the RFC 8029.

The use-case mostly specifies inter-AS VPNs as the m= otivation.

 

Certain aspects of Segment Routing such as anycast S= IDs required clear guideline on how the validation procedure should work.

Also Generic FEC may not be widely supported and if = transit routers are not upgraded to support validation of generic FEC, trac= eroute may fail.

So instead of adding such clarifications to generic = FEC, we went with new EGRESS TLV in Nil FEC.

Its an optional TLV so the procedures will work fine= even if transit routers are not upgraded.

While we clearly specify the processing of egress tl= v so that all SR cases are well specified.

 

Since explicit path can be created using node-sid, a= dj-sid, binding-sid, anycast-sids etc. EGRESS TLV prefix will be derived fr= om path egress/destination and not based on labels used in the path to reac= h the destination.

 

I will update introduction section of draft with thi= s comparison.

 

>>I also think that section 5 requires more de= tails about how backward compatibility is achieved. What is the behavior of= a node that does not support this solution when it receives the EGRESS TLV= ?

 

[Deepti]:

Backward compatibility on egress-node:

On egress/destination, it will ignore EGRESS TLV and= use current NIL-FEC procedure with return code 3 but egress validation wil= l not be done (same as RFC 8029). So we wont know for sure if packet has re= ached the correct path egress.

 

Backward compatibility on transit-node:

If the transit node doesn’t support, it will u= se current NIL-FEC procedure and send return code of 8.

 

I will add section in draft for backward compatibili= ty.

 

Italo

 

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51phVJEr/5p1+K2akxM80XjBZ3z/JRBAlQpRzoP6ZM76M7xhEQfq/At7D+4+2FDjM3PYCB/mLB7368X7nsM3jg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB6486 X-Proofpoint-ORIG-GUID: Rd9m4OeeFrJh-Tm03h_GHUKAbsYBuGc8 X-Proofpoint-GUID: Rd9m4OeeFrJh-Tm03h_GHUKAbsYBuGc8 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-17_13:2021-06-15, 2021-06-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 bulkscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 mlxscore=0 spamscore=0 adultscore=0 clxscore=1011 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106170094 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 14:44:59 -0000 --_000_BY3PR05MB80812F41AD9D8DF461407922C70E9BY3PR05MB8081namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Comment inline. Yours Irrespectively, John Juniper Business Use Only From: mpls On Behalf Of Alexander Vainshtein Sent: Thursday, June 17, 2021 5:07 AM To: Stewart Bryant Cc: mpls@ietf.org Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Stewart, I fully agree with your statement that "an old implementation that received= a ToS GAL not at BoS would at best throw an exception or worst be unpredic= table". Regarding your statement "it is OK to have multiple GALs and GALs not at Bo= S IFF the creator of the LSP ensured that all LSRs on the LSP, including EC= MP and FRR paths that found the GAL at ToS were known to be able to process= it correctly": 1. I fully agree with this statement as a general restriction 2. Quite a lot of things have to be done in order to make this restricti= on work including at least: * The definition of correct processing of GAL at ToS but not at BoS = must be provided * Advertisement of ability to process GAL not at BoS correctly in IG= P and BGP must be defined * Ability to set up network-wide paths that only cross nodes that pr= ocess GAL correctly must be provided for different techniques (RSVP-TE, SR-= TE, FlexAlgo. BGP-LU etc.) It is still possible that, after all this work, we shall find out that the= benefits of supporting GAL at ToS but not BoS will be only available in th= e networks where all the nodes support the new functionality because presen= ce of non-supporting nodes imposes too many restrictions on connectivity an= d/or resilience. [JD] As we start to add all sorts of nifty functions both within the stack= and after it, we need to add these functions in such a way that a transit = LSR that does not understand one or more of them still will be able to forw= ard a packet containing them. For example, if we were to add ancillary dat= a in the label stack, it needs to be done in such a way as to allow a trans= it router to skip over the ancillary data that it doesn't understand. I.e., incremental deployment is a fact of life and we have to live with it. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: Stewart Bryant > Sent: Thursday, June 17, 2021 10:36 AM To: Alexander Vainshtein > Cc: Stewart Bryant >; gregory.mirsky@ztetx.com; mpls@ietf.o= rg Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS On 17 Jun 2021, at 07:45, Alexander Vainshtein > wrote: While that might be the case, I think that the Open DT may give it a try an= d investigate how the existing systems will handle GAL being not the BoS la= bel. [[Sasha]] Great minds think alike! One useful step could be collecting the = known actual behavior of popular implementations in this case, say, by runn= ing a survey among the vendors - what do you think? That is actually a considerable amount of work that will take a while. It seems to me that an old implementation that received a ToS GAL not at Bo= S would at best throw an exception or worst be unpredictable. The original assumed processing model is to take the context of the PW labe= l or PW+FAT label, discover the GAL and then process the GAL in the context= of the PW label. When we extended GAL to apply to LSPs we again had the model that the GAL o= perated in the context of the LSP label that preceded it for context. It wa= s still BoS. Putting the GAL further up the stack is a new behaviour. If it arrives at an LSR that knows the new semantic all is good. If it arrives at an LSR that does not know the new semantic then a) An error has occurred either in setting up the LSP, or in forwarding. b) The behaviour at the receiving node is unpredictable, but in any well wr= itten implementation should just result in the packet being dropped and cou= nted as with any other Mal-formed packet. So I would think that it is OK to have multiple GALs and GALs not at BoS IF= F the creator of the LSP ensured that all LSRs on the LSP, including ECMP a= nd FRR paths that found the GAL at ToS were known to be able to process it = correctly. A GAL not at BoS and not at ToS should not be inspected or processed by any= LSR that did not know what it was doing, and to attempt to precess it woul= d be a violation of the normal MPLS processing model. - Stewart Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB80812F41AD9D8DF461407922C70E9BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org= > On Behalf Of Alexander Vainshtein
Sent: Thursday, June 17, 2021 5:07 AM
To: Stewart Bryant <stewart.bryant@gmail.com>
Cc: mpls@ietf.org
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Stewart,

I fully agree with your statement tha= t “an old implementation that received a ToS GAL not at BoS wo= uld at best throw an exception or worst be unpredictableR= 21;.

 

Regarding your statement “it is OK to have multiple GALs and GALs not at BoS IFF the creator of the= LSP ensured that all LSRs on the LSP, including ECMP and FRR paths that found the GAL at ToS were known to be able to process i= t correctly”:

  1. I fully agree with this statement as a general restriction
  2. Quite a lot of things have to be done in order to make this restriction wo= rk including at least:
    1. The definition of correct processing of GAL at ToS but not at BoS must be = provided
    2. Advertisement of ability to process GAL not at BoS correctly in IGP and BG= P must be defined
    3. Ability to set up network-wide paths that only cross nodes that process GA= L correctly must be provided for different techniques (RSVP-TE, SR-TE, Flex= Algo. BGP-LU etc.)

It is still possible that, after all = this work, we shall find out  that the benefits of supporting GAL at T= oS but not BoS will be only available in the networks where all the nodes support the new functionality because presence of non-= supporting nodes imposes too many restrictions on connectivity and/or resil= ience.

 

[JD]  As we start to add all sorts of ni= fty functions both within the stack and after it, we need to add these func= tions in such a way that a transit LSR that does not understand one or more of them still will be able to forward a packet cont= aining them.  For example, if we were to add ancillary data in the lab= el stack, it needs to be done in such a way as to allow a transit router to= skip over the ancillary data that it doesn’t understand.

 

I.e., incremental deployment is a fact of lif= e and we have to live with it.

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      += 972-549266302

Email:   Alexander.Vainshtein@rbbn.= com

 

From: Stewart Bryant <stewart.bryant@gmail.com>
Sent: Thursday, June 17, 2021 10:36 AM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: Stewart Bryant <s= tewart.bryant@gmail.com>; gregory.mirsky@ztetx.com; <= a href=3D"mailto:mpls@ietf.org"> mpls@ietf.org
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

 

 

On 17 Jun 2021, at 07:45, Alexander Vainshtein <<= a href=3D"mailto:Alexander.Vainshtein@rbbn.com">Alexander.Vainshtein@rbbn.c= om> wrote:

 

While that might be the case, I think that the Open= DT may give it a try and investigate how the existing systems will handle = GAL being not the BoS label.

[[Sasha]] Great minds think ali= ke! One useful step could be collecting the known actual behavior of popula= r implementations in this case, say, by running a survey among the vendors – what do you think?=

 

 

That is actually a considerable amount of work that = will take a while.

 

It seems to me that an old implementation that recei= ved a ToS GAL not at BoS would at best throw an exception or worst be unpre= dictable.

 

The original assumed processing model is to take the= context of the PW label or PW+FAT label, discover the GAL and then process= the GAL in the context of the PW label.

 

When we extended GAL to apply to LSPs we again had t= he model that the GAL operated in the context of the LSP label that precede= d it for context. It was still BoS.

 

Putting the GAL further up the stack is a new behavi= our.

 

If it arrives at an LSR that knows the new semantic = all is good.

 

If it arrives at an LSR that does not know the new s= emantic then 

 

a) An error has occurred either in setting up the LS= P, or in forwarding.

 

b) The behaviour at the receiving node is unpredicta= ble, but in any well written implementation should just result in the packe= t being dropped and counted as with any other Mal-formed packet.=

 

So I would think that it is OK to have multiple GALs= and GALs not at BoS IFF the creator of the LSP ensured that all LSRs on th= e LSP, including ECMP and FRR paths that found the GAL at ToS were known to= be able to process it correctly.

 

A GAL not at BoS and not at ToS should not be inspec= ted or processed by any LSR that did not know what it was doing, and to att= empt to precess it would be a violation of the normal MPLS processing model= .

 

- Stewart

 

 


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

--_000_BY3PR05MB80812F41AD9D8DF461407922C70E9BY3PR05MB8081namp_-- From nobody Thu Jun 17 07:46:30 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C0B1B3A22F9 for ; Thu, 17 Jun 2021 07:46:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VmkgbVIgQavZ for ; Thu, 17 Jun 2021 07:46:22 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 618963A22EE for ; Thu, 17 Jun 2021 07:46:22 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 60FE8348949; Thu, 17 Jun 2021 16:46:19 +0200 (CEST) To: "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Cc: "mpls@ietf.org" References: <202106170323552620410@zte.com.cn> From: Loa Andersson Message-ID: Date: Thu, 17 Jun 2021 16:46:18 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 14:46:29 -0000 DT, Responded to Jeffrey's mail, but it is intended to address the entire discussion. There seem to be enough issues to sort out around the GAL/ACH pair, and I was worried about a set of other indicators and the data that they might want to put "after the BoS". So far I have seen no real effort to address the interference's this might lead to. Further inline On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > Hi, > > It’s not clear how we could put a GAL not at a BoS: > >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >    |                              ACH                              | > >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >    |                         ACH TLV Header                        | > >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >    |                                                               ~ > >    ~                     zero or more ACH TLVs                     ~ > >    ~                                                               | > >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >    |                                                               ~ > >    ~                        G-ACh Message                          ~ > >    ~                                                               | > >    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >                       Figure 2: G-ACh Packet Payload > > If the GAL does not have S-bit set, wouldn’t a transit LSR treat any > 4-ocet field (i.e. those in the above Figure) after that GAL as a > label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit > LSR will think the label stack ends there even though that’s just part > of the ACH. > > Or are you saying that a GAL not at the BoS will not have the ACH > following it? Well, as far as I understand a GAL which does not have the NoS-bit set will have other labels after itself. The BoS-bit will be found deeper down stack and the ACH will immediately fo9llow the BoS. Yes there are issues here, but I'd like to see the DT address multiple indicators in the stack and multiple sets of ancillary data after the BoS. I think we need to nail down the relevant questiuons first, and start working on solutions after that. /Loa > > Jeffrey > > *From:*mpls *On Behalf Of *Alexander Vainshtein > *Sent:* Thursday, June 17, 2021 5:07 AM > *To:* Stewart Bryant > *Cc:* mpls@ietf.org > *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > *[External Email. Be cautious of content]* > > Stewart, > > I fully agree with your statement that “an old implementation that > received a ToS GAL not at BoS would at best throw an exception or worst > be unpredictable”. > > Regarding your statement “it is OK to have multiple GALs and GALs not at > BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > including ECMP and FRR paths that found the GAL at ToS were known to be > able to process it correctly”: > > 1. I fully agree with this statement as a general restriction > 2. Quite a lot of things have to be done in order to make this > restriction work including at least: > > 1. The definition of correct processing of GAL at ToS but not at > BoS must be provided > 2. Advertisement of ability to process GAL not at BoS correctly in > IGP and BGP must be defined > 3. Ability to set up network-wide paths that only cross nodes that > process GAL correctly must be provided for different techniques > (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > It is still possible that, after all this work, we shall find out  that > the benefits of supporting GAL at ToS but not BoS will be only available > in the networks where all the nodes support the new functionality > because presence of non-supporting nodes imposes too many restrictions > on connectivity and/or resilience. > > Regards, > > Sasha > > Office: +972-39266302 > > Cell:      +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > *From:*Stewart Bryant > > *Sent:* Thursday, June 17, 2021 10:36 AM > *To:* Alexander Vainshtein > > *Cc:* Stewart Bryant >; gregory.mirsky@ztetx.com > ; mpls@ietf.org > *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > On 17 Jun 2021, at 07:45, Alexander Vainshtein > > wrote: > > While that might be the case, I think that the Open DT may give it a > try and investigate how the existing systems will handle GAL being > not the BoS label. > > */[[Sasha]] Great minds think alike! One useful step could be > collecting the known actual behavior of popular implementations in > this case, say, by running a survey among the vendors – what do you > think?/* > > That is actually a considerable amount of work that will take a while. > > It seems to me that an old implementation that received a ToS GAL not at > BoS would at best throw an exception or worst be unpredictable. > > The original assumed processing model is to take the context of the PW > label or PW+FAT label, discover the GAL and then process the GAL in the > context of the PW label. > > When we extended GAL to apply to LSPs we again had the model that the > GAL operated in the context of the LSP label that preceded it for > context. It was still BoS. > > Putting the GAL further up the stack is a new behaviour. > > If it arrives at an LSR that knows the new semantic all is good. > > If it arrives at an LSR that does not know the new semantic then > > a) An error has occurred either in setting up the LSP, or in forwarding. > > b) The behaviour at the receiving node is unpredictable, but in any well > written implementation should just result in the packet being dropped > and counted as with any other Mal-formed packet. > > So I would think that it is OK to have multiple GALs and GALs not at BoS > IFF the creator of the LSP ensured that all LSRs on the LSP, including > ECMP and FRR paths that found the GAL at ToS were known to be able to > process it correctly. > > A GAL not at BoS and not at ToS should not be inspected or processed by > any LSR that did not know what it was doing, and to attempt to precess > it would be a violation of the normal MPLS processing model. > > - Stewart > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others or > forwarding without express permission is strictly prohibited. If you are > not the intended recipient, please notify the sender immediately and > then delete all copies, including any attachments. > > > Juniper Business Use Only > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Thu Jun 17 07:53:44 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 118C03A2326 for ; Thu, 17 Jun 2021 07:53:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t1vnAqIvvrn0 for ; Thu, 17 Jun 2021 07:53:38 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 772653A231C for ; Thu, 17 Jun 2021 07:53:38 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id F2A8C34894A; Thu, 17 Jun 2021 16:53:36 +0200 (CEST) To: John E Drake , Alexander Vainshtein , Stewart Bryant Cc: "mpls@ietf.org" References: <202106170323552620410@zte.com.cn> From: Loa Andersson Message-ID: Date: Thu, 17 Jun 2021 16:53:35 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 14:53:43 -0000 DT, Quick comments on John's mail: On 17/06/2021 16:44, John E Drake wrote: > *//* > > */[JD] As we start to add all sorts of nifty functions both within the > stack and after it, we need to add these functions in such a way that a > transit LSR that does not understand one or more of them still will be > able to forward a packet containing them. Yes, we must have an architecture that supports that. > For example, if we were to > add ancillary data in the label stack, it needs to be done in such a way > as to allow a transit router to skip over the ancillary data that it > doesnt understand./* Ancillary "data in the stack"? Does not all ancillary data go after the BoS? /Loa > > *//* > > */I.e., incremental deployment is a fact of life and we have to live > with it./* > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Thu Jun 17 07:55:54 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 95AA53A2357 for ; Thu, 17 Jun 2021 07:55:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.497 X-Spam-Level: X-Spam-Status: No, score=-3.497 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=juniper.net header.b=u7sWRJvE; 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Thu, 17 Jun 2021 14:55:35 +0000 From: John E Drake To: Loa Andersson , Alexander Vainshtein , Stewart Bryant CC: "mpls@ietf.org" Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rmz8bFcB45u0+GX6eUo5f23asX0EoAgAAZVICAAFhqQIAACIeAgAAAPDA= Date: Thu, 17 Jun 2021 14:55:34 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-17T14:55:33Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=bcc5c01c-8bf5-4b6e-90a1-68fa4e4efdc6; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR05MB8081.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 38a35c64-7a56-4b37-d976-08d9319ff64b X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Jun 2021 14:55:35.0198 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: lYt30JifoGVWlzjWNcZgCsUcdeyIuMRu5zRKQWsSy2PVt0ojUoNv4YYMlDMdmua8urVZBumHtUfbvb52IYQXDQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB4262 X-Proofpoint-ORIG-GUID: MnVCVC1Mv2VSHBqqLDXYjabAwO4R43OU X-Proofpoint-GUID: MnVCVC1Mv2VSHBqqLDXYjabAwO4R43OU X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-17_13:2021-06-15, 2021-06-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 clxscore=1015 malwarescore=0 suspectscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 impostorscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106170095 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 14:55:52 -0000 Loa, I thought the FAI proposal put ancillary data in the stack. Yours Irrespectively, John Juniper Business Use Only > -----Original Message----- > From: Loa Andersson > Sent: Thursday, June 17, 2021 10:54 AM > To: John E Drake ; Alexander Vainshtein > ; Stewart Bryant > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data= after > the BoS >=20 > [External Email. Be cautious of content] >=20 >=20 > DT, >=20 > Quick comments on John's mail: >=20 > On 17/06/2021 16:44, John E Drake wrote: > > *//* > > > > */[JD] As we start to add all sorts of nifty functions both within the > > stack and after it, we need to add these functions in such a way that > > a transit LSR that does not understand one or more of them still will > > be able to forward a packet containing them. >=20 > Yes, we must have an architecture that supports that. >=20 > > For example, if we were to > > add ancillary data in the label stack, it needs to be done in such a > > way as to allow a transit router to skip over the ancillary data that > > it doesn't understand./* >=20 > Ancillary "data in the stack"? Does not all ancillary data go after the = BoS? >=20 > /Loa > > > > *//* > > > > */I.e., incremental deployment is a fact of life and we have to live > > with it./* > > >=20 > -- >=20 > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Thu Jun 17 08:01:58 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E8543A2369 for ; Thu, 17 Jun 2021 08:01:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.497 X-Spam-Level: X-Spam-Status: No, score=-3.497 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.698, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: 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15:01:32 +0000 From: "Jeffrey (Zhaohui) Zhang" To: Loa Andersson , Alexander Vainshtein , Stewart Bryant CC: "mpls@ietf.org" Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0RmbAITnxhwMUWQkxpAfLtXgKsX0EoAgAAZVICAAFKAUIAADGgAgAADVWA= Date: Thu, 17 Jun 2021 15:01:32 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=447c4558-2846-4613-aa5c-32934dbcb6d7; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=0; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; 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adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106170096 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 15:01:57 -0000 SGkgTG9hLA0KDQo+IGJ1dCBJJ2QgbGlrZSB0byBzZWUgdGhlIERUIGFkZHJlc3MgbXVsdGlwbGUg aW5kaWNhdG9ycyBpbiB0aGUgc3RhY2sgYW5kIG11bHRpcGxlIHNldHMgb2YgYW5jaWxsYXJ5IGRh dGEgYWZ0ZXIgdGhlIEJvUy4NCg0KSSB0aGluayB0aGUgZWFybGllciBlbWFpbHMgb2YgdGhpcyBl bWFpbCB0aHJlYWQgd2VyZSB0YWxraW5nIGFib3V0IG11bHRpcGxlIGluZGljYXRvcnMgaW4gdGhl IHN0YWNrOyBmb3IgbXVsdGlwbGUgc2V0IG9mIGFuY2lsbGFyeSBkYXRhIGFmdGVyIHRoZSBCb1Ms IGVpdGhlciB0aGUgZXh0ZW5kZWQgQUNIIG9yIHRoZSBwcm9wb3NlZCBNUExTL2dlbmVyaWMgZXh0 ZW5zaW9uIGhlYWRlcnMgb3IgYSBtZXJnZSBvZiB0aG9zZSBwcm9wb3NhbHMgc2hvdWxkIGJlIGFi 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OyEhTkV0NnlNYU8tZ2shUlZnVEdWYmtuamdJanYzeC1xOG9iMUpnbEZLT1A2cUtrZ0FjQ1NQYmVC TU1qMkFuZXhGblBldlhvcGVLMWE2dSQNCj4NCg0KLS0NCg0KTG9hIEFuZGVyc3NvbiAgICAgICAg ICAgICAgICAgICAgICAgIGVtYWlsOiBsb2FAcGkubnUNClNlbmlvciBNUExTIEV4cGVydCAgICAg ICAgICAgICAgICAgICAgICAgICAgbG9hLnBpLm51QGdtYWlsLmNvbQ0KQnJvbnplIERyYWdvbiBD b25zdWx0aW5nICAgICAgICAgICAgIHBob25lOiArNDYgNzM5IDgxIDIxIDY0DQoNCkp1bmlwZXIg QnVzaW5lc3MgVXNlIE9ubHkNCg== From nobody Thu Jun 17 08:03:58 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A1AF13A237B for ; Thu, 17 Jun 2021 08:03:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7KN72GZm3kow for ; Thu, 17 Jun 2021 08:03:52 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 51F8B3A236B for ; Thu, 17 Jun 2021 08:03:52 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id D464B34894A; Thu, 17 Jun 2021 17:03:50 +0200 (CEST) To: John E Drake , Alexander Vainshtein , Stewart Bryant Cc: "mpls@ietf.org" References: <202106170323552620410@zte.com.cn> From: Loa Andersson Message-ID: <05f6b1f7-71ca-9a57-75f1-7f4389f4fb43@pi.nu> Date: Thu, 17 Jun 2021 17:03:49 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 15:03:58 -0000 John, I might have missed something, but I have not seen that defined anywhere; if we want a stand alone bit set in the FAI to be ancillary data, what is a bit that points to data after the BoS? In my mind any bit in the FAI is anindicator, that is why it named FAI. But I'm willing to changed my mind about the naming as long as we have an agreement. /Loa On 17/06/2021 16:55, John E Drake wrote: > Loa, > > I thought the FAI proposal put ancillary data in the stack. > > Yours Irrespectively, > > John > > > Juniper Business Use Only > >> -----Original Message----- >> From: Loa Andersson >> Sent: Thursday, June 17, 2021 10:54 AM >> To: John E Drake ; Alexander Vainshtein >> ; Stewart Bryant >> >> Cc: mpls@ietf.org >> Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after >> the BoS >> >> [External Email. Be cautious of content] >> >> >> DT, >> >> Quick comments on John's mail: >> >> On 17/06/2021 16:44, John E Drake wrote: >>> *//* >>> >>> */[JD] As we start to add all sorts of nifty functions both within the >>> stack and after it, we need to add these functions in such a way that >>> a transit LSR that does not understand one or more of them still will >>> be able to forward a packet containing them. >> >> Yes, we must have an architecture that supports that. >> >>> For example, if we were to >>> add ancillary data in the label stack, it needs to be done in such a >>> way as to allow a transit router to skip over the ancillary data that >>> it doesn't understand./* >> >> Ancillary "data in the stack"? Does not all ancillary data go after the BoS? >> >> /Loa >>> >>> *//* >>> >>> */I.e., incremental deployment is a fact of life and we have to live >>> with it./* >>> >> >> -- >> >> Loa Andersson email: loa@pi.nu >> Senior MPLS Expert loa.pi.nu@gmail.com >> Bronze Dragon Consulting phone: +46 739 81 21 64 -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Thu Jun 17 08:07:57 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DF3583A23A1 for ; Thu, 17 Jun 2021 08:07:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IxPvBXnm4kev for ; Thu, 17 Jun 2021 08:07:49 -0700 (PDT) Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E7BA83A239E for ; Thu, 17 Jun 2021 08:07:48 -0700 (PDT) Received: by mail-wm1-x331.google.com with SMTP id j18so3489853wms.3 for ; Thu, 17 Jun 2021 08:07:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=OvlMXRZdAS4bmViMKovCYc1MjxGyXUsenkuSIWJ1wf0=; b=j/P2+PIpJr6cMLmjB5wYcIqTjyxS+GnddzTEUgr9gfyJbg/KrJH7UpDkp900NkU6ID dJUqKRfWH09HqAUUtly/GGalTq/Y0Y6UddXDo1trIDxKamfVesdAKvVyghK6U2sVZZfX OvjT28smVDlFbIgQxHpL0yq9HjfGwItGtq+ux0AnQJEiGZPY4KdpdbCL/xUTTdiGsAMD JSfzZzApTeH0jXwbv+dSa7ND0m+CeNYyd95san3hDwH1dKBXK8s+5iB9oZTNZ0h0w0LT ZiZ434SyeMFdZ8pJXcE+rt7N9qEdeeY0OjyTOL73Heoprr/gG85krlQHU36eu7lGctHi Fibw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=OvlMXRZdAS4bmViMKovCYc1MjxGyXUsenkuSIWJ1wf0=; b=TPQG4YR3IWBTieuIKE0ec7Myd2B5tYdX+5iJ3rUiacZqu0Z7DVoRIuxgcBVvQsBEPQ uBHYI+IzYtz4Hm+PRlrapu/RzourCunzsZEJIqnzXAPsV2t/+61DgiPAZfRdSaTKX2fa fdvAP6M/NKveZz6h5rmlqQFNRtH7R6CToAhATmBN247zcMee5qw6Fze6jpN9NtsgrXvE qjs2KDTv/irXZqhlOhx660UoZl8ODYDgYgvuTSQaO33CypTZPUF87e9jXIo+ASEC6HLf yMh0Oei0SV7GjlfG/UqnMMXnoYyTvbphhjN8bjfT5wUbrM3LGPXN5zH5qLFTjLbsn9Us 605w== X-Gm-Message-State: AOAM531qhAH7y0KKJk2pJ9NTXYkW9AfFWFaSRGTq+5Zq3MCdsUIKo9VS c4RuUm2/sVmuVs110aaB01w= X-Google-Smtp-Source: ABdhPJwGiFlnotufxzfaSbCC+FlMNzzQRC+1esQEae5RTwKhUXqylpJi04CxzapAFq5Pq5HWt3j/ig== X-Received: by 2002:a7b:c110:: with SMTP id w16mr5847623wmi.4.1623942464457; Thu, 17 Jun 2021 08:07:44 -0700 (PDT) Received: from [192.168.8.179] ([85.255.236.232]) by smtp.gmail.com with ESMTPSA id h9sm4901225wmb.35.2021.06.17.08.07.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 17 Jun 2021 08:07:44 -0700 (PDT) From: Stewart Bryant Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_731FCBC3-AC32-4679-B8E5-D03ECD8579C9" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.6\)) Date: Thu, 17 Jun 2021 16:07:41 +0100 In-Reply-To: Cc: Stewart Bryant , "gregory.mirsky@ztetx.com" , "mpls@ietf.org" To: Alexander Vainshtein References: <202106170323552620410@zte.com.cn> X-Mailer: Apple Mail (2.3608.120.23.2.6) Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 15:07:55 -0000 --Apple-Mail=_731FCBC3-AC32-4679-B8E5-D03ECD8579C9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Sasha I completely agree on all points. Stewart > On 17 Jun 2021, at 10:06, Alexander Vainshtein = wrote: >=20 > Stewart, > I fully agree with your statement that =E2=80=9Can old implementation = that received a ToS GAL not at BoS would at best throw an exception or = worst be unpredictable=E2=80=9D. > =20 > Regarding your statement =E2=80=9Cit is OK to have multiple GALs and = GALs not at BoS IFF the creator of the LSP ensured that all LSRs on the = LSP, including ECMP and FRR paths that found the GAL at ToS were known = to be able to process it correctly=E2=80=9D: > 1. I fully agree with this statement as a general restriction > 2. Quite a lot of things have to be done in order to make this = restriction work including at least: > a. The definition of correct processing of GAL at ToS but not at = BoS must be provided > b. Advertisement of ability to process GAL not at BoS correctly = in IGP and BGP must be defined > c. Ability to set up network-wide paths that only cross nodes = that process GAL correctly must be provided for different techniques = (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > It is still possible that, after all this work, we shall find out = that the benefits of supporting GAL at ToS but not BoS will be only = available in the networks where all the nodes support the new = functionality because presence of non-supporting nodes imposes too many = restrictions on connectivity and/or resilience. > =20 > Regards, > Sasha > =20 > Office: +972-39266302 > Cell: +972-549266302 > Email: Alexander.Vainshtein@rbbn.com = > =20 > From: Stewart Bryant =20 > Sent: Thursday, June 17, 2021 10:36 AM > To: Alexander Vainshtein > Cc: Stewart Bryant ; = gregory.mirsky@ztetx.com; mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary = data after the BoS > =20 > =20 >=20 >=20 > On 17 Jun 2021, at 07:45, Alexander Vainshtein = > = wrote: > =20 > While that might be the case, I think that the Open DT may give it a = try and investigate how the existing systems will handle GAL being not = the BoS label. > [[Sasha]] Great minds think alike! One useful step could be collecting = the known actual behavior of popular implementations in this case, say, = by running a survey among the vendors =E2=80=93 what do you think? > =20 > =20 > That is actually a considerable amount of work that will take a while. > =20 > It seems to me that an old implementation that received a ToS GAL not = at BoS would at best throw an exception or worst be unpredictable. > =20 > The original assumed processing model is to take the context of the PW = label or PW+FAT label, discover the GAL and then process the GAL in the = context of the PW label. > =20 > When we extended GAL to apply to LSPs we again had the model that the = GAL operated in the context of the LSP label that preceded it for = context. It was still BoS. > =20 > Putting the GAL further up the stack is a new behaviour. > =20 > If it arrives at an LSR that knows the new semantic all is good. > =20 > If it arrives at an LSR that does not know the new semantic then=20 > =20 > a) An error has occurred either in setting up the LSP, or in = forwarding. > =20 > b) The behaviour at the receiving node is unpredictable, but in any = well written implementation should just result in the packet being = dropped and counted as with any other Mal-formed packet. > =20 > So I would think that it is OK to have multiple GALs and GALs not at = BoS IFF the creator of the LSP ensured that all LSRs on the LSP, = including ECMP and FRR paths that found the GAL at ToS were known to be = able to process it correctly. > =20 > A GAL not at BoS and not at ToS should not be inspected or processed = by any LSR that did not know what it was doing, and to attempt to = precess it would be a violation of the normal MPLS processing model. > =20 > - Stewart > =20 > =20 >=20 > Notice: This e-mail together with any attachments may contain = information of Ribbon Communications Inc. and its Affiliates that is = confidential and/or proprietary for the sole use of the intended = recipient. Any review, disclosure, reliance or distribution by others or = forwarding without express permission is strictly prohibited. If you are = not the intended recipient, please notify the sender immediately and = then delete all copies, including any attachments. --Apple-Mail=_731FCBC3-AC32-4679-B8E5-D03ECD8579C9 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Sasha

I completely = agree on all points.

Stewart

On 17 Jun 2021, at 10:06, = Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> wrote:

Stewart,
I fully agree with your = statement that =E2=80=9Can old implementation that received a ToS = GAL not at BoS would at best throw an exception or worst be = unpredictable=E2=80=9D.
 
Regarding your = statement =E2=80=9Cit is OK to have multiple GALs and GALs not at = BoS IFF the creator of the LSP ensured that all LSRs on the LSP, = including ECMP and FRR paths that found the GAL at ToS were known to be = able to process it correctly=E2=80=9D:
1.       I = fully agree with this statement as a general restriction
2.       Quite a lot of things have to be done in order to make this = restriction work including at least:
a.       The= definition of correct processing of GAL at ToS but not at BoS must be = provided
b.       Advertisement of ability to process GAL not at BoS correctly = in IGP and BGP must be defined
c.       Ability to set up network-wide paths that only cross nodes = that process GAL correctly must be provided for different techniques = (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)
It is still possible = that, after all this work, we shall find out  that the benefits of = supporting GAL at ToS but not BoS will be only available in the networks = where all the nodes support the new functionality because presence of = non-supporting nodes imposes too many restrictions on connectivity = and/or resilience.
 
Regards,
Sasha
 
Office: +972-39266302
Cell:      +972-549266302
 
From: Stewart Bryant <stewart.bryant@gmail.com> 
Sent: Thursday, June 17, 2021 = 10:36 AM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>; gregory.mirsky@ztetx.com; mpls@ietf.org
Subject: Re: [mpls] [EXTERNAL] = Indicators in the stack and ancillary data after the BoS
 
 


On 17 Jun = 2021, at 07:45, Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> wrote:
 
While that might be the case, I think that the Open DT may = give it a try and investigate how the existing systems will handle GAL = being not the BoS label.
[[Sasha]] = Great minds think alike! One useful step could be collecting the known = actual behavior of popular implementations in this case, say, by running = a survey among the vendors =E2=80=93 what do you = think?
 
 
That is = actually a considerable amount of work that will take a while.
 
It seems to = me that an old implementation that received a ToS GAL not at BoS would = at best throw an exception or worst be unpredictable.
 
The = original assumed processing model is to take the context of the PW label = or PW+FAT label, discover the GAL and then process the GAL in the = context of the PW label.
 
When we extended GAL to apply to LSPs we = again had the model that the GAL operated in the context of the LSP = label that preceded it for context. It was still BoS.
 
Putting the = GAL further up the stack is a new behaviour.
 
If it = arrives at an LSR that knows the new semantic all is good.
 
If it = arrives at an LSR that does not know the new semantic then 
 
a) An error = has occurred either in setting up the LSP, or in forwarding.
 
b) The = behaviour at the receiving node is unpredictable, but in any well = written implementation should just result in the packet being dropped = and counted as with any other Mal-formed packet.
 
So I would = think that it is OK to have multiple GALs and GALs not at BoS IFF the = creator of the LSP ensured that all LSRs on the LSP, including ECMP and = FRR paths that found the GAL at ToS were known to be able to process it = correctly.
 
A GAL not at BoS and not at ToS should = not be inspected or processed by any LSR that did not know what it was = doing, and to attempt to precess it would be a violation of the normal = MPLS processing model.
 
- Stewart
 
 

Notice: This e-mail together = with any attachments may contain information of Ribbon Communications = Inc. and its Affiliates that is confidential and/or proprietary for the = sole use of the intended recipient. Any review, disclosure, reliance or = distribution by others or forwarding without express permission is = strictly prohibited. If you are not the intended recipient, please = notify the sender immediately and then delete all copies, including any = attachments.

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Thu, 17 Jun 2021 16:56:09 +0000 From: Haoyu Song To: "Jeffrey (Zhaohui) Zhang" , Loa Andersson , Alexander Vainshtein , Stewart Bryant CC: "mpls@ietf.org" Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rm7nMf9KuVWE2klFLLNHKj8asX0EoAgAAZVICAAFZpgIAACH8AgAAEQgCAAB7mQA== Date: Thu, 17 Jun 2021 16:56:09 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ActionId=447c4558-2846-4613-aa5c-32934dbcb6d7; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_ContentBits=0; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-17T14:58:14Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SiteId=bea78b3c-4cdb-4130-854a-1d193232e5f4; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR13MB2762.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f34f0b4-3d2a-4ac1-c01c-08d931b0ce60 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Jun 2021 16:56:09.4529 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9dwaisqze6C+y4w6yTOYRnmoFSmyz9N3CK09DxIMu0qRo8nR8y+vHcWO19vHHgMvWw5mSwV2CSqp50lFvRoXYw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR13MB3580 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jun 2021 16:56:18 -0000 My opinion is to not tamper with ACH anymore because it's designed for cont= rol channel only and so far for a special scenario. The constraints on GAL = and format of ACH are hard to adapt to the new use case requirements.=20 Thanks! Haoyu -----Original Message----- From: mpls On Behalf Of Jeffrey (Zhaohui) Zhang Sent: Thursday, June 17, 2021 8:02 AM To: Loa Andersson ; Alexander Vainshtein ; Stewart Bryant Cc: mpls@ietf.org Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi Loa, > but I'd like to see the DT address multiple indicators in the stack and m= ultiple sets of ancillary data after the BoS. I think the earlier emails of this email thread were talking about multiple= indicators in the stack; for multiple set of ancillary data after the BoS,= either the extended ACH or the proposed MPLS/generic extension headers or = a merge of those proposals should be able to handle it. This is alluded to = the DataAfterBOS wiki page. Thanks. Jeffrey -----Original Message----- From: Loa Andersson Sent: Thursday, June 17, 2021 10:46 AM To: Jeffrey (Zhaohui) Zhang ; Alexander Vainshtein ; Stewart Bryant Cc: mpls@ietf.org Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] DT, Responded to Jeffrey's mail, but it is intended to address the entire discu= ssion. There seem to be enough issues to sort out around the GAL/ACH pair, and I w= as worried about a set of other indicators and the data that they might wan= t to put "after the BoS". So far I have seen no real effort to address the = interference's this might lead to. Further inline On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > Hi, > > It's not clear how we could put a GAL not at a BoS: > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > | ACH | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > | ACH TLV Header | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > | ~ > > ~ zero or more ACH TLVs ~ > > ~ | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > | ~ > > ~ G-ACh Message ~ > > ~ | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Figure 2: G-ACh Packet Payload > > If the GAL does not have S-bit set, wouldn't a transit LSR treat any=20 > 4-ocet field (i.e. those in the above Figure) after that GAL as a > label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit > LSR will think the label stack ends there even though that's just part=20 > of the ACH. > > Or are you saying that a GAL not at the BoS will not have the ACH=20 > following it? Well, as far as I understand a GAL which does not have the NoS-bit set will= have other labels after itself. The BoS-bit will be found deeper down stac= k and the ACH will immediately fo9llow the BoS. Yes there are issues here, but I'd like to see the DT address multiple indi= cators in the stack and multiple sets of ancillary data after the BoS. I think we need to nail down the relevant questiuons first, and start worki= ng on solutions after that. /Loa > > Jeffrey > > *From:*mpls *On Behalf Of *Alexander=20 > Vainshtein > *Sent:* Thursday, June 17, 2021 5:07 AM > *To:* Stewart Bryant > *Cc:* mpls@ietf.org > *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary=20 > data after the BoS > > *[External Email. Be cautious of content]* > > Stewart, > > I fully agree with your statement that "an old implementation that=20 > received a ToS GAL not at BoS would at best throw an exception or=20 > worst be unpredictable". > > Regarding your statement "it is OK to have multiple GALs and GALs not=20 > at BoS IFF the creator of the LSP ensured that all LSRs on the LSP,=20 > including ECMP and FRR paths that found the GAL at ToS were known to=20 > be able to process it correctly": > > 1. I fully agree with this statement as a general restriction 2.=20 > Quite a lot of things have to be done in order to make this > restriction work including at least: > > 1. The definition of correct processing of GAL at ToS but not at > BoS must be provided > 2. Advertisement of ability to process GAL not at BoS correctly in > IGP and BGP must be defined > 3. Ability to set up network-wide paths that only cross nodes that > process GAL correctly must be provided for different techniques > (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > It is still possible that, after all this work, we shall find out =20 > that the benefits of supporting GAL at ToS but not BoS will be only=20 > available in the networks where all the nodes support the new=20 > functionality because presence of non-supporting nodes imposes too=20 > many restrictions on connectivity and/or resilience. > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com=20 > > > *From:*Stewart Bryant > > *Sent:* Thursday, June 17, 2021 10:36 AM > *To:* Alexander Vainshtein > > *Cc:* Stewart Bryant >; gregory.mirsky@ztetx.com=20 > ; mpls@ietf.org=20 > > *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary=20 > data after the BoS > > On 17 Jun 2021, at 07:45, Alexander Vainshtein > > wrote: > > While that might be the case, I think that the Open DT may give it a > try and investigate how the existing systems will handle GAL being > not the BoS label. > > */[[Sasha]] Great minds think alike! One useful step could be > collecting the known actual behavior of popular implementations in > this case, say, by running a survey among the vendors - what do you > think?/* > > That is actually a considerable amount of work that will take a while. > > It seems to me that an old implementation that received a ToS GAL not=20 > at BoS would at best throw an exception or worst be unpredictable. > > The original assumed processing model is to take the context of the PW=20 > label or PW+FAT label, discover the GAL and then process the GAL in=20 > the context of the PW label. > > When we extended GAL to apply to LSPs we again had the model that the=20 > GAL operated in the context of the LSP label that preceded it for=20 > context. It was still BoS. > > Putting the GAL further up the stack is a new behaviour. > > If it arrives at an LSR that knows the new semantic all is good. > > If it arrives at an LSR that does not know the new semantic then > > a) An error has occurred either in setting up the LSP, or in forwarding. > > b) The behaviour at the receiving node is unpredictable, but in any=20 > well written implementation should just result in the packet being=20 > dropped and counted as with any other Mal-formed packet. > > So I would think that it is OK to have multiple GALs and GALs not at=20 > BoS IFF the creator of the LSP ensured that all LSRs on the LSP,=20 > including ECMP and FRR paths that found the GAL at ToS were known to=20 > be able to process it correctly. > > A GAL not at BoS and not at ToS should not be inspected or processed=20 > by any LSR that did not know what it was doing, and to attempt to=20 > precess it would be a violation of the normal MPLS processing model. > > - Stewart > > > Notice: This e-mail together with any attachments may contain=20 > information of Ribbon Communications Inc. and its Affiliates that is=20 > confidential and/or proprietary for the sole use of the intended=20 > recipient. Any review, disclosure, reliance or distribution by others=20 > or forwarding without express permission is strictly prohibited. If=20 > you are not the intended recipient, please notify the sender=20 > immediately and then delete all copies, including any attachments. > > > Juniper Business Use Only > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Furld > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2F > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2A > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49de > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0% > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3IjG > dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Juniper Business Use Only _______________________________________________ mpls mailing list mpls@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40futurewei.co= m%7Ccc49de9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1= %7C0%7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI= joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DXQlRpwkgODLRxc= IjyMYyPMiCF2KDC0Y7GG4O8VGESnw%3D&reserved=3D0 From nobody Fri Jun 18 02:07:07 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C6273A0794 for ; 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Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Jun 2021 09:07:05 -0000 Hi Stewad, Sasha, I second that. Cheers, Huub. ===== On 17/06/2021 17:07, Stewart Bryant wrote: > Hi Sasha > > I completely agree on all points. > > Stewart > >> On 17 Jun 2021, at 10:06, Alexander Vainshtein >> > >> wrote: >> >> Stewart, >> I fully agree with your statement that “an old implementation that >> received a ToS GAL not at BoS would at best throw an exception or >> worst be unpredictable”. >> Regarding your statement “it is OK to have multiple GALs and GALs not >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly”: >> 1.I fully agree with this statement as a general restriction >> 2.Quite a lot of things have to be done in order to make this >> restriction work including at least: >> a.The definition of correct processing of GAL at ToS but not at BoS >> must be provided >> b.Advertisement of ability to process GAL not at BoS correctly in IGP >> and BGP must be defined >> c.Ability to set up network-wide paths that only cross nodes that >> process GAL correctly must be provided for different techniques >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) >> It is still possible that, after all this work, we shall find out >>  that the benefits of supporting GAL at ToS but not BoS will be only >> available in the networks where all the nodes support the new >> functionality because presence of non-supporting nodes imposes too >> many restrictions on connectivity and/or resilience. >> Regards, >> Sasha >> Office: +972-39266302 >> Cell:      +972-549266302 >> Email: Alexander.Vainshtein@rbbn.com >> >> *From:*Stewart Bryant > > >> *Sent:*Thursday, June 17, 2021 10:36 AM >> *To:*Alexander Vainshtein > > >> *Cc:*Stewart Bryant > >; gregory.mirsky@ztetx.com >> ; mpls@ietf.org >> *Subject:*Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary >> data after the BoS >> >> >> On 17 Jun 2021, at 07:45, Alexander Vainshtein >> > > wrote: >> While that might be the case, I think that the Open DT may give it >> a try and investigate how the existing systems will handle GAL >> being not the BoS label. >> */[[Sasha]] Great minds think alike! One useful step could be >> collecting the known actual behavior of popular implementations in >> this case, say, by running a survey among the vendors – what do >> you think?/* >> >> That is actually a considerable amount of work that will take a while. >> It seems to me that an old implementation that received a ToS GAL not >> at BoS would at best throw an exception or worst be unpredictable. >> The original assumed processing model is to take the context of the PW >> label or PW+FAT label, discover the GAL and then process the GAL in >> the context of the PW label. >> When we extended GAL to apply to LSPs we again had the model that the >> GAL operated in the context of the LSP label that preceded it for >> context. It was still BoS. >> Putting the GAL further up the stack is a new behaviour. >> If it arrives at an LSR that knows the new semantic all is good. >> If it arrives at an LSR that does not know the new semantic then >> a) An error has occurred either in setting up the LSP, or in forwarding. >> b) The behaviour at the receiving node is unpredictable, but in any >> well written implementation should just result in the packet being >> dropped and counted as with any other Mal-formed packet. >> So I would think that it is OK to have multiple GALs and GALs not at >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly. >> A GAL not at BoS and not at ToS should not be inspected or processed >> by any LSR that did not know what it was doing, and to attempt to >> precess it would be a violation of the normal MPLS processing model. >> - Stewart >> >> Notice: This e-mail together with any attachments may contain >> information of Ribbon Communications Inc. and its Affiliates that is >> confidential and/or proprietary for the sole use of the intended >> recipient. Any review, disclosure, reliance or distribution by others >> or forwarding without express permission is strictly prohibited. If >> you are not the intended recipient, please notify the sender >> immediately and then delete all copies, including any attachments. > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > -- ================================================================ Always remember that you are unique...just like everyone else... From nobody Sun Jun 20 03:14:59 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A72B13A0C28; Sun, 20 Jun 2021 03:14:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: mpls@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.32.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: mpls@ietf.org Message-ID: <162418409763.24454.10156432539611161238@ietfa.amsl.com> Date: Sun, 20 Jun 2021 03:14:57 -0700 Archived-At: Subject: [mpls] I-D Action: draft-ietf-mpls-ri-rsvp-frr-11.txt X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Jun 2021 10:14:58 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiprotocol Label Switching WG of the IETF. Title : Refresh-interval Independent FRR Facility Protection Authors : Chandra Ramachandran Tarek Saad Ina Minei Dante Pacella Filename : draft-ietf-mpls-ri-rsvp-frr-11.txt Pages : 27 Date : 2021-06-20 Abstract: RSVP-TE Fast ReRoute extensions specified in RFC 4090 defines two local repair techniques to reroute Label Switched Path (LSP) traffic over pre-established backup tunnel. Facility backup method allows one or more LSPs traversing a connected link or node to be protected using a bypass tunnel. The many-to-one nature of local repair technique is attractive from scalability point of view. This document enumerates facility backup procedures in RFC 4090 that rely on refresh timeout and hence make facility backup method refresh- interval dependent. The RSVP-TE extensions defined in this document will enhance the facility backup protection mechanism by making the corresponding procedures refresh-interval independent and hence compatible with Refresh-interval Independent RSVP (RI-RSVP) specified in RFC 8370. Hence, this document updates RFC 4090 in order to support RI-RSVP capability specified in RFC 8370. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-mpls-ri-rsvp-frr/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-ietf-mpls-ri-rsvp-frr-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ri-rsvp-frr-11 Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Sun Jun 20 04:12:53 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 495583A100D for ; Sun, 20 Jun 2021 04:12:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.335 X-Spam-Level: X-Spam-Status: No, score=-0.335 tagged_above=-999 required=5 tests=[NICE_REPLY_A=-0.338, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ngix6B1aIX3U for ; Sun, 20 Jun 2021 04:12:47 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 292413A1009 for ; Sun, 20 Jun 2021 04:12:47 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id F2EAB3489CB; Sun, 20 Jun 2021 13:12:43 +0200 (CEST) To: "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Cc: "mpls@ietf.org" References: <202106170323552620410@zte.com.cn> From: Loa Andersson Message-ID: <1bd54f43-880e-07f9-93cd-7d0aba9266d0@pi.nu> Date: Sun, 20 Jun 2021 13:11:25 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Jun 2021 11:12:52 -0000 Jeffrey, On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > Hi Loa, > >> but I'd like to see the DT address multiple indicators in the stack and multiple sets of ancillary data after the BoS. > > I think the earlier emails of this email thread were talking about multiple indicators in the stack; for multiple set of ancillary data after the BoS, either the extended ACH or the proposed MPLS/generic extension headers or a merge of those proposals should be able to handle it. This is alluded to the DataAfterBOS wiki page. hmm - yes partly, but there are several indicators proposed in several drafts draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH indicator draft-kompella-mpls-mspl4fa make use of TC field and TTL of a special purpose label (FAI) as indicators there has also been discussion about putting more than one GAL in the stack, i.e. differerent GALs pointing to different ACHs. draft-many-mpls-multiple-gal proposes to add a copy of the GAL higher uop the stack so that LSRs with a too shallow maximun readable depth might reach the GAL there has also been discussion about putting more than one GAL in the stack, i.e. differerent GALs pointing to different ACHs. draft-song-mpls-eh-indicator have a list of potential indicators, that is also telling if the EH should be processed on every EH capable node or "just" at ingress and egress The FAI might put ancillary data after the BoS. I think we need to have a comprehensive discussion - first what we want to have - second how when re-direct by an indicator we find the ancillary data that belongs to that indicator. /Loa > > Thanks. > > Jeffrey > > -----Original Message----- > From: Loa Andersson > Sent: Thursday, June 17, 2021 10:46 AM > To: Jeffrey (Zhaohui) Zhang ; Alexander Vainshtein ; Stewart Bryant > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS > > [External Email. Be cautious of content] > > > DT, > > Responded to Jeffrey's mail, but it is intended to address the entire > discussion. > > There seem to be enough issues to sort out around the GAL/ACH pair, and > I was worried about a set of other indicators and the data that they > might want to put "after the BoS". So far I have seen no real effort to > address the interference's this might lead to. > > Further inline > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: >> Hi, >> >> It’s not clear how we could put a GAL not at a BoS: >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH TLV Header | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ zero or more ACH TLVs ~ >> >> ~ | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ G-ACh Message ~ >> >> ~ | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> Figure 2: G-ACh Packet Payload >> >> If the GAL does not have S-bit set, wouldn’t a transit LSR treat any >> 4-ocet field (i.e. those in the above Figure) after that GAL as a >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit >> LSR will think the label stack ends there even though that’s just part >> of the ACH. >> >> Or are you saying that a GAL not at the BoS will not have the ACH >> following it? > > Well, as far as I understand a GAL which does not have the NoS-bit set > will have other labels after itself. The BoS-bit will be found deeper > down stack and the ACH will immediately fo9llow the BoS. > > Yes there are issues here, but I'd like to see the DT address multiple > indicators in the stack and multiple sets of ancillary data after the BoS. > > I think we need to nail down the relevant questiuons first, and start > working on solutions after that. > > /Loa >> >> Jeffrey >> >> *From:*mpls *On Behalf Of *Alexander Vainshtein >> *Sent:* Thursday, June 17, 2021 5:07 AM >> *To:* Stewart Bryant >> *Cc:* mpls@ietf.org >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary >> data after the BoS >> >> *[External Email. Be cautious of content]* >> >> Stewart, >> >> I fully agree with your statement that “an old implementation that >> received a ToS GAL not at BoS would at best throw an exception or worst >> be unpredictable”. >> >> Regarding your statement “it is OK to have multiple GALs and GALs not at >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to be >> able to process it correctly”: >> >> 1. I fully agree with this statement as a general restriction >> 2. Quite a lot of things have to be done in order to make this >> restriction work including at least: >> >> 1. The definition of correct processing of GAL at ToS but not at >> BoS must be provided >> 2. Advertisement of ability to process GAL not at BoS correctly in >> IGP and BGP must be defined >> 3. Ability to set up network-wide paths that only cross nodes that >> process GAL correctly must be provided for different techniques >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) >> >> It is still possible that, after all this work, we shall find out that >> the benefits of supporting GAL at ToS but not BoS will be only available >> in the networks where all the nodes support the new functionality >> because presence of non-supporting nodes imposes too many restrictions >> on connectivity and/or resilience. >> >> Regards, >> >> Sasha >> >> Office: +972-39266302 >> >> Cell: +972-549266302 >> >> Email: Alexander.Vainshtein@rbbn.com >> >> *From:*Stewart Bryant > > >> *Sent:* Thursday, June 17, 2021 10:36 AM >> *To:* Alexander Vainshtein > > >> *Cc:* Stewart Bryant > >; gregory.mirsky@ztetx.com >> ; mpls@ietf.org >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary >> data after the BoS >> >> On 17 Jun 2021, at 07:45, Alexander Vainshtein >> > > wrote: >> >> While that might be the case, I think that the Open DT may give it a >> try and investigate how the existing systems will handle GAL being >> not the BoS label. >> >> */[[Sasha]] Great minds think alike! One useful step could be >> collecting the known actual behavior of popular implementations in >> this case, say, by running a survey among the vendors – what do you >> think?/* >> >> That is actually a considerable amount of work that will take a while. >> >> It seems to me that an old implementation that received a ToS GAL not at >> BoS would at best throw an exception or worst be unpredictable. >> >> The original assumed processing model is to take the context of the PW >> label or PW+FAT label, discover the GAL and then process the GAL in the >> context of the PW label. >> >> When we extended GAL to apply to LSPs we again had the model that the >> GAL operated in the context of the LSP label that preceded it for >> context. It was still BoS. >> >> Putting the GAL further up the stack is a new behaviour. >> >> If it arrives at an LSR that knows the new semantic all is good. >> >> If it arrives at an LSR that does not know the new semantic then >> >> a) An error has occurred either in setting up the LSP, or in forwarding. >> >> b) The behaviour at the receiving node is unpredictable, but in any well >> written implementation should just result in the packet being dropped >> and counted as with any other Mal-formed packet. >> >> So I would think that it is OK to have multiple GALs and GALs not at BoS >> IFF the creator of the LSP ensured that all LSRs on the LSP, including >> ECMP and FRR paths that found the GAL at ToS were known to be able to >> process it correctly. >> >> A GAL not at BoS and not at ToS should not be inspected or processed by >> any LSR that did not know what it was doing, and to attempt to precess >> it would be a violation of the normal MPLS processing model. >> >> - Stewart >> >> >> Notice: This e-mail together with any attachments may contain >> information of Ribbon Communications Inc. and its Affiliates that is >> confidential and/or proprietary for the sole use of the intended >> recipient. Any review, disclosure, reliance or distribution by others or >> forwarding without express permission is strictly prohibited. If you are >> not the intended recipient, please notify the sender immediately and >> then delete all copies, including any attachments. >> >> >> Juniper Business Use Only >> >> >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/mpls__;!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ >> > > -- > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 > > Juniper Business Use Only > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Jun 21 01:50:13 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A56BF3A28EF; Mon, 21 Jun 2021 01:50:11 -0700 (PDT) X-Virus-Scanned: 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Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 08:50:12 -0000 WysgYXV0aG9ycyBvZiBkcmFmdC1zb25nLW1wbHMtZWgtaW5kaWNhdG9yXQ0KDQo+IEZyb206IG1w bHMgW21haWx0bzptcGxzLWJvdW5jZXNAaWV0Zi5vcmddIE9uIEJlaGFsZiBPZiBMb2EgQW5kZXJz c29uDQo+IA0KPiBKZWZmcmV5LA0KPiANCj4gDQo+IE9uIDE3LzA2LzIwMjEgMTc6MDEsIEplZmZy ZXkgKFpoYW9odWkpIFpoYW5nIHdyb3RlOg0KPiA+IEhpIExvYSwNCj4gPg0KPiA+PiBidXQgSSdk IGxpa2UgdG8gc2VlIHRoZSBEVCBhZGRyZXNzIG11bHRpcGxlIGluZGljYXRvcnMgaW4gdGhlIHN0 YWNrIGFuZCBtdWx0aXBsZQ0KPiBzZXRzIG9mIGFuY2lsbGFyeSBkYXRhIGFmdGVyIHRoZSBCb1Mu DQo+ID4NCj4gPiBJIHRoaW5rIHRoZSBlYXJsaWVyIGVtYWlscyBvZiB0aGlzIGVtYWlsIHRocmVh ZCB3ZXJlIHRhbGtpbmcgYWJvdXQgbXVsdGlwbGUgaW5kaWNhdG9ycw0KPiBpbiB0aGUgc3RhY2s7 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IHlvdS4KCg== From nobody Mon Jun 21 02:40:15 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 95A143A2A62 for ; Mon, 21 Jun 2021 02:40:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.334 X-Spam-Level: X-Spam-Status: No, score=-0.334 tagged_above=-999 required=5 tests=[NICE_REPLY_A=-0.338, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WjDDOJmeDTu7 for ; Mon, 21 Jun 2021 02:40:01 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25F583A2A55 for ; Mon, 21 Jun 2021 02:40:00 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id CFB653489FA; Mon, 21 Jun 2021 11:39:57 +0200 (CEST) To: Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Cc: "mpls@ietf.org" References: <202106170323552620410@zte.com.cn> From: Loa Andersson Message-ID: <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> Date: Mon, 21 Jun 2021 11:39:57 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 09:40:14 -0000 Haoyu, DT On 17/06/2021 18:56, Haoyu Song wrote: > My opinion is to not tamper with ACH anymore because it's designed for control channel only and so far for a special scenario. The constraints on GAL and format of ACH are hard to adapt to the new use case requirements. > I think this is a position that is possible to defend. One question though. RFC 5586 specifies "that the ACH appears immediately after the bottom of the label stack." If the slot immediately after the label stack is reserved for the ACH does this mean the no other ancillary data maybe inserted in this position, e.g. MPLS EH's, given that there is a GAL in the stack? /Loa > Thanks! > Haoyu > > -----Original Message----- > From: mpls On Behalf Of Jeffrey (Zhaohui) Zhang > Sent: Thursday, June 17, 2021 8:02 AM > To: Loa Andersson ; Alexander Vainshtein ; Stewart Bryant > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS > > Hi Loa, > >> but I'd like to see the DT address multiple indicators in the stack and multiple sets of ancillary data after the BoS. > > I think the earlier emails of this email thread were talking about multiple indicators in the stack; for multiple set of ancillary data after the BoS, either the extended ACH or the proposed MPLS/generic extension headers or a merge of those proposals should be able to handle it. This is alluded to the DataAfterBOS wiki page. > > Thanks. > > Jeffrey > > -----Original Message----- > From: Loa Andersson > Sent: Thursday, June 17, 2021 10:46 AM > To: Jeffrey (Zhaohui) Zhang ; Alexander Vainshtein ; Stewart Bryant > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS > > [External Email. Be cautious of content] > > > DT, > > Responded to Jeffrey's mail, but it is intended to address the entire discussion. > > There seem to be enough issues to sort out around the GAL/ACH pair, and I was worried about a set of other indicators and the data that they might want to put "after the BoS". So far I have seen no real effort to address the interference's this might lead to. > > Further inline > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: >> Hi, >> >> It's not clear how we could put a GAL not at a BoS: >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH TLV Header | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ zero or more ACH TLVs ~ >> >> ~ | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ G-ACh Message ~ >> >> ~ | >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> Figure 2: G-ACh Packet Payload >> >> If the GAL does not have S-bit set, wouldn't a transit LSR treat any >> 4-ocet field (i.e. those in the above Figure) after that GAL as a >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit >> LSR will think the label stack ends there even though that's just part >> of the ACH. >> >> Or are you saying that a GAL not at the BoS will not have the ACH >> following it? > > Well, as far as I understand a GAL which does not have the NoS-bit set will have other labels after itself. The BoS-bit will be found deeper down stack and the ACH will immediately fo9llow the BoS. > > Yes there are issues here, but I'd like to see the DT address multiple indicators in the stack and multiple sets of ancillary data after the BoS. > > I think we need to nail down the relevant questiuons first, and start working on solutions after that. > > /Loa >> >> Jeffrey >> >> *From:*mpls *On Behalf Of *Alexander >> Vainshtein >> *Sent:* Thursday, June 17, 2021 5:07 AM >> *To:* Stewart Bryant >> *Cc:* mpls@ietf.org >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary >> data after the BoS >> >> *[External Email. Be cautious of content]* >> >> Stewart, >> >> I fully agree with your statement that "an old implementation that >> received a ToS GAL not at BoS would at best throw an exception or >> worst be unpredictable". >> >> Regarding your statement "it is OK to have multiple GALs and GALs not >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly": >> >> 1. I fully agree with this statement as a general restriction 2. >> Quite a lot of things have to be done in order to make this >> restriction work including at least: >> >> 1. The definition of correct processing of GAL at ToS but not at >> BoS must be provided >> 2. Advertisement of ability to process GAL not at BoS correctly in >> IGP and BGP must be defined >> 3. Ability to set up network-wide paths that only cross nodes that >> process GAL correctly must be provided for different techniques >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) >> >> It is still possible that, after all this work, we shall find out >> that the benefits of supporting GAL at ToS but not BoS will be only >> available in the networks where all the nodes support the new >> functionality because presence of non-supporting nodes imposes too >> many restrictions on connectivity and/or resilience. >> >> Regards, >> >> Sasha >> >> Office: +972-39266302 >> >> Cell: +972-549266302 >> >> Email: Alexander.Vainshtein@rbbn.com >> >> >> *From:*Stewart Bryant > > >> *Sent:* Thursday, June 17, 2021 10:36 AM >> *To:* Alexander Vainshtein > > >> *Cc:* Stewart Bryant > >; gregory.mirsky@ztetx.com >> ; mpls@ietf.org >> >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary >> data after the BoS >> >> On 17 Jun 2021, at 07:45, Alexander Vainshtein >> > > wrote: >> >> While that might be the case, I think that the Open DT may give it a >> try and investigate how the existing systems will handle GAL being >> not the BoS label. >> >> */[[Sasha]] Great minds think alike! One useful step could be >> collecting the known actual behavior of popular implementations in >> this case, say, by running a survey among the vendors - what do you >> think?/* >> >> That is actually a considerable amount of work that will take a while. >> >> It seems to me that an old implementation that received a ToS GAL not >> at BoS would at best throw an exception or worst be unpredictable. >> >> The original assumed processing model is to take the context of the PW >> label or PW+FAT label, discover the GAL and then process the GAL in >> the context of the PW label. >> >> When we extended GAL to apply to LSPs we again had the model that the >> GAL operated in the context of the LSP label that preceded it for >> context. It was still BoS. >> >> Putting the GAL further up the stack is a new behaviour. >> >> If it arrives at an LSR that knows the new semantic all is good. >> >> If it arrives at an LSR that does not know the new semantic then >> >> a) An error has occurred either in setting up the LSP, or in forwarding. >> >> b) The behaviour at the receiving node is unpredictable, but in any >> well written implementation should just result in the packet being >> dropped and counted as with any other Mal-formed packet. >> >> So I would think that it is OK to have multiple GALs and GALs not at >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly. >> >> A GAL not at BoS and not at ToS should not be inspected or processed >> by any LSR that did not know what it was doing, and to attempt to >> precess it would be a violation of the normal MPLS processing model. >> >> - Stewart >> >> >> Notice: This e-mail together with any attachments may contain >> information of Ribbon Communications Inc. and its Affiliates that is >> confidential and/or proprietary for the sole use of the intended >> recipient. Any review, disclosure, reliance or distribution by others >> or forwarding without express permission is strictly prohibited. If >> you are not the intended recipient, please notify the sender >> immediately and then delete all copies, including any attachments. >> >> >> Juniper Business Use Only >> >> >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Furld >> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2F >> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2A >> nexFnPevXopeK1a6u%24&data=04%7C01%7Chsong%40futurewei.com%7Ccc49de >> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0% >> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI >> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5et4Juc3IjG >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=0 >> > > -- > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 > > Juniper Business Use Only > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=04%7C01%7Chsong%40futurewei.com%7Ccc49de9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=XQlRpwkgODLRxcIjyMYyPMiCF2KDC0Y7GG4O8VGESnw%3D&reserved=0 > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Jun 21 02:55:43 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 064773A2AA9 for ; Mon, 21 Jun 2021 02:55:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.19 X-Spam-Level: X-Spam-Status: No, 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(Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 062343489FC; Mon, 21 Jun 2021 12:15:57 +0200 (CEST) To: Alexander Vainshtein Cc: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Stewart Bryant References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> From: Loa Andersson Message-ID: <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> Date: Mon, 21 Jun 2021 12:15:56 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 10:16:05 -0000 Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with GAL > as well. Would you include adding a copy of the GAL higher up in the stack to make sure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL in > the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC 8169 > where G-ACH is > used for residence time measurement. Logically this means that we can carry everything in the associated channel. However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell:      +972-549266302 > > Email:   Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song ; Jeffrey (Zhaohui) Zhang > ; Alexander Vainshtein > ; Stewart Bryant > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom of > the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls > On > Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >; Alexander Vainshtein > > > >; Stewart Bryant > > > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the stack > and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to handle > it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson > > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the entire > discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that they > might want to put "after the BoS". So far I have seen no real effort to > address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >>      |                              ACH                              | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >>      |                         ACH TLV Header                        | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >>      |                                                               ~ > > >> > > >>      ~                     zero or more ACH TLVs                     ~ > > >> > > >>      ~                                                               | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >>      |                                                               ~ > > >> > > >>      ~                        G-ACh Message                          ~ > > >> > > >>      ~                                                               | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >>                         Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and start > working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls > > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known to > > >> be able to process it correctly": > > >> > > >>   1. I fully agree with this statement as a general restriction  2. > > >> Quite a lot of things have to be done in order to make this > > >>      restriction work including at least: > > >> > > >>       1. The definition of correct processing of GAL at ToS but not at > > >>          BoS must be provided > > >>       2. Advertisement of ability to process GAL not at BoS correctly in > > >>          IGP and BGP must be defined > > >>       3. Ability to set up network-wide paths that only cross nodes that > > >>          process GAL correctly must be provided for different techniques > > >>          (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell:      +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >>      On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >>      > >>      >> wrote: > > >> > > >>      While that might be the case, I think that the Open DT may give > it a > > >>      try and investigate how the existing systems will handle GAL being > > >>      not the BoS label. > > >> > > >>      */[[Sasha]] Great minds think alike! One useful step could be > > >>      collecting the known actual behavior of popular implementations in > > >>      this case, say, by running a survey among the vendors - what do you > > >>      think?/* > > >> > > >> That is actually a considerable amount of work that will take a while. > > >> > > >> It seems to me that an old implementation that received a ToS GAL not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of the > > >> PW label or PW+FAT label, discover the GAL and then process the GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwarding. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by others > > >> or forwarding without express permission is strictly prohibited. If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=https%3A% > > > >> 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> nexFnPevXopeK1a6u%24&data=04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=0 > > >> > > > > > > -- > > > > > > Loa Andersson                        email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting             phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=https%3A%2 > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson                        email: loa@pi.nu > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting             phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others or > forwarding without express permission is strictly prohibited. If you are > not the intended recipient, please notify the sender immediately and > then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Jun 21 03:55:07 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 930903A2C61 for ; Mon, 21 Jun 2021 03:54:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.189 X-Spam-Level: X-Spam-Status: No, score=-0.189 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 12:51:49 -0000 --_000_BY3PR05MB80817B45C5AC0BD9FDA54E93C70A9BY3PR05MB8081namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls On Behalf Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart has responded that "an old implementat= ion that received a ToS GAL not at BoS would at best throw an exception or = worst be unpredictable". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cannot detect presence of GAL at BoS due = to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/353Ka7ifLCb9e7KAz= jZ4fsf6H2?u=3Dhttps*3A*252__;JSU!!NEt6yMaO-gk!QiStnftbs7rzJ6JZRtxhV6LZks_wN= vQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB80817B45C5AC0BD9FDA54E93C70A9BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

I agree with Sasha’s email, below, which is pr= oposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transit= LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label= stack, either when it understands the label pair or when it doesn't.<= /o:p>

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> O= n Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include = adding a copy of the GAL higher up in the stack to make sure that it is wit= hin readable depth for any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is= exposed as ToS but not BoS to an existing standards-compliant MPLS forward= er, it will not know how to handle it since such handling has not ever been= defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique th= at would guarantee that packets with GAL in the middle of the stack only pa= ss thru new LSRs that know how to handle them .

 

However, it is quite possible to do the following= IMHO:

  1. Retain the exi= sting definitions of GAL just at BoS and ACH that immediately follows the B= oS
  2. Define new ACH types that can carry new ancillary data, and the structu= res that can be used for this purpose (as you have said, “we can carr= y everything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications = to process such structures in ACH, but at least this would not affect MPLS = forwarding).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b)= recognize new ACH types to meddle with the information carried in the ACH = while forwarding labeled packets in the usual way
  4. Also allow usage of TTL= to help LERs that recognize new ACH types to meddle with the information c= arried in the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough= for the specific set of applications. But it looks to me as reasonably saf= e since it does not require any new forwarding functionality in existing LE= Rs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:<= o:p>

> Loa and all,

>

> I fully agree with the proposal "to not= tamper with ACH anymore".

>

>  From my POV, this includes (by implica= tion) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR?=

>

> As for the question " If the slot immed= iately after the label stack is

> reserved for the ACH does this mean the no o= ther ancillary data may be

> inserted in this position, e.g. MPLS EH's, g= iven that there is a GAL

> in the stack" the answer, IMHO, is YES.=

>

> However, it is quite possible to carry any k= ind of new information in

> the ACH, similar to the way this has been do= ne in Section 3 of RFC

> 8169

> <https://clicktime.symant= ec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2F= doc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything= in the associated channel. However there can only one ACH per packet, righ= t?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549= 266302

>

> Email:   Alexander.Vainshtein@= rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:<= /o:p>

>

>  > My opinion is to not tamper with = ACH anymore because it's designed

> for control channel only and so far for a sp= ecial scenario. The

> constraints on GAL and format of ACH are har= d to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible = to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appear= s immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label stac= k is reserved for the ACH

> does this mean the no other ancillary data m= aybe inserted in this

> position, e.g. MPLS EH's, given that there i= s a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpls-b= ounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:0= 2 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexa= nder

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT ad= dress multiple indicators in the

> stack and multiple sets of ancillary data af= ter the BoS.

>

>  >

>

>  > I think the earlier emails of thi= s email thread were talking about

> multiple indicators in the stack; for multip= le set of ancillary data

> after the BoS, either the extended ACH or th= e proposed MPLS/generic

> extension headers or a merge of those propos= als should be able to

> handle it. This is alluded to the DataAfterB= OS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:= 46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <z= zhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of c= ontent]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but = it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to= sort out around the GAL/ACH pair,

> and I was worried about a set of other indic= ators and the data that

> they might want to put "after the BoS&q= uot;. So far I have seen no real

> effort to address the interference's this mi= ght lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zha= ohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could p= ut a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;     ACH       &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;            ACH= TLV Header          &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;            =

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;        zero or more ACH TLVs =             &nb= sp;      

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           G-ACh Mes= sage            = ;            &n= bsp;

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     =             &nb= sp;       Figure 2: G-ACh Packet Payload=

>

>  >>

>

>  >> If the GAL does not have S-bi= t set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in t= he above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-oc= tet field has the S-bit set, the

> transit

>

>  >> LSR will think the label stac= k ends there even though that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL = not at the BoS will not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GA= L which does not have the NoS-bit

> set will have other labels after itself. The= BoS-bit will be found

> deeper down stack and the ACH will immediate= ly fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I'= d like to see the DT address

> multiple indicators in the stack and multipl= e sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the = relevant questiuons first, and

> start working on solutions after that.<= /o:p>

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto= :mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 20= 21 5:07 AM

>

>  >> *To:* Stewart Bryant <stew= art.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.o= rg <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >> *[External Email. Be cautious= of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your state= ment that "an old implementation that

>

>  >> received a ToS GAL not at BoS= would at best throw an exception or

>

>  >> worst be unpredictable".=

>

>  >>

>

>  >> Regarding your statement &quo= t;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the= LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly":

>

>  >>

>

>  >>   1. I fully agree = with this statement as a general restriction  2.

>

>  >> Quite a lot of things have to= be done in order to make this

>

>  >>     = restriction work including at least:

>

>  >>

>

>  >>     =   1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     =      BoS must be provided

>

>  >>     =   2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     =      IGP and BGP must be defined

>

>  >>     =   3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     =      process GAL correctly must be provided for differe= nt

> techniques

>

>  >>     =      (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)=

>

>  >>

>

>  >> It is still possible that, af= ter all this work, we shall find out

>

>  >> that the benefits of supporti= ng GAL at ToS but not BoS will be

> only

>

>  >> available in the networks whe= re all the nodes support the new

>

>  >> functionality because presenc= e of non-supporting nodes imposes too

>

>  >> many restrictions on connecti= vity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    =   +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 20= 21 10:36 AM

>

>  >> *To:* Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stew= art.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zte= tx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >>     = On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = <Alexander.Vainshtein@rbbn.com

>

>  >>     = <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = try and investigate how the existing systems will handle GAL

> being

>

>  >>     = not the BoS label.

>

>  >>

>

>  >>     = */[[Sasha]] Great minds think alike! One useful step could be

>

>  >>     = collecting the known actual behavior of popular

> implementations in

>

>  >>     = this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = think?/*

>

>  >>

>

>  >> That is actually a considerab= le amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old im= plementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw an= exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed processi= ng model is to take the context of

> the

>

>  >> PW label or PW+FAT label, dis= cover the GAL and then process the

> GAL

>

>  >> in the context of the PW labe= l.

>

>  >>

>

>  >> When we extended GAL to apply= to LSPs we again had the model that

> the

>

>  >> GAL operated in the context o= f the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up th= e stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that = knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that = does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eith= er in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the recei= ving node is unpredictable, but in

> any

>

>  >> well written implementation s= hould just result in the packet being

>

>  >> dropped and counted as with a= ny other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is O= K to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the LS= P ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly.

>

>  >>

>

>  >> A GAL not at BoS and not at T= oS should not be inspected or

> processed

>

>  >> by any LSR that did not know = what it was doing, and to attempt to

>

>  >> precess it would be a violati= on of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together = with any attachments may contain

>

>  >> information of Ribbon Communi= cations Inc. and its Affiliates that

> is

>

>  >> confidential and/or proprieta= ry for the sole use of the intended

>

>  >> recipient. Any review, disclo= sure, reliance or distribution by

> others

>

>  >> or forwarding without express= permission is strictly prohibited.

> If

>

>  >> you are not the intended reci= pient, please notify the sender

>

>  >> immediately and then delete a= ll copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _____________________________= __________________

>

>  >> mpls mailing list<= /p>

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxd= Ze1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.o= rg%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob= 1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%= 7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b2401= 89c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d= 8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C= 1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F= 6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson   &n= bsp;            = ;        email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

>  > Bronze Dragon Consulting &nb= sp;           phone: +46 = 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _________________________________= ______________

>

>  > mpls mailing list

>

>  > = mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifL= Cb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2= F%3Furl%3Dhttps%253A%252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%25= 2Fmpls%26data%3D04%257C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a2= 4092e29708d931a0e327%257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%= 257C637595389337881384%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQIjoiV2luMzIiLCJBTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DX= QlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%= 3D0

>

>  >

>

> --

>

> Loa Andersson     &= nbsp;           &nbs= p;      email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

> Bronze Dragon Consulting   &n= bsp;         phone: +46 739 81 21 6= 4

>

>

> Notice: This e-mail together with any attach= ments may contain

> information of Ribbon Communications Inc. an= d its Affiliates that is

> confidential and/or proprietary for the sole= use of the intended

> recipient. Any review, disclosure, reliance = or distribution by others

> or forwarding without express permission is = strictly prohibited. If

> you are not the intended recipient, please n= otify the sender

> immediately and then delete all copies, incl= uding any attachments.

 

--

 

Loa Andersson      =              &n= bsp;    email: loa@pi.nu<= o:p>

Senior MPLS Expert     &= nbsp;           &nbs= p;        loa.pi.nu@gmail.com

Bronze Dragon Consulting    &= nbsp;        phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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boundary="_000_MW4PR03MB63954ECABD96C12A7A7F9447F60A9MW4PR03MB6395namp_" MIME-Version: 1.0 X-OriginatorOrg: rbbn.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MW4PR03MB6395.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a91e7e44-61a0-4fef-5788-08d934cba867 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2021 15:45:55.6841 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 29a671dc-ed7e-4a54-b1e5-8da1eb495dc3 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: oH+cPJfa83Zh0jo8LT8fOuL1TAnESMDRCM4oYhimQZidT3Xc7ApC4pNuhVNn9RFbEOlf9jN9NG4F9li1fR43wg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR03MB3328 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 15:46:19 -0000 --_000_MW4PR03MB63954ECABD96C12A7A7F9447F60A9MW4PR03MB6395namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and 5, an egress LSR that signals both ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]. All that is needed is to clarify the (rather, self-evident) rules for SIDs= for which the originating routers effectively signal Implicit Null (exp= licitly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleare= d in IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the= BGP-LU route. I do not think that I have missed anything (Binding SIDs are not involved = in PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein ; Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zha= ng Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing= several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it= finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf= Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR= ?" my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not B= oS to an existing standards-compliant MPLS forwarder, it will not know how= to handle it since such handling has not ever been defined - not in RFC 5= 586 and not anywhere else. Stewart has responded = that "an old implementation that received a ToS GAL not at BoS would at be= st throw an exception or worst be unpredictable". Neither of these option= s sounds optimistic to me. I also do not favor investing into a technique that would guarantee that p= ackets with GAL in the middle of the stack only pass thru new LSRs that kn= ow how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that imme= diately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the stru= ctures that can be used for this purpose (as you have said, "we can carry = everything in the associated channel", including TLVs and Sub-TLVs, if nec= essary - it will be up to the specific applications to process such struct= ures in ACH, but at least this would not affect=20MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogn= ize new ACH types to meddle with the information carried in the ACH while = forwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to= meddle with the information carried in the ACH (similar to what has been = done in RFC 8169) even if they cannot detect pres= ence of GAL at BoS due to the depth of the stack. I cannot say whether this approach is good enough for the specific set of = applications. But it looks to me as reasonably safe since it does not requ= ire any new forwarding functionality in existing LERs - primum non nocere<= https://clicktime.symantec.com/3GdXcZMxHHLvCC23kWNFkFG6H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fen.wikipedia.org%2Fwiki%2FPrimum_non_= nocere__%3B%21%21NEt6yMaO-gk%21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW= 6lEzzVD0vSHtMI1UZKH0%24>. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart = Bryant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make = sure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for res= idence time measurement. Logically this means that we can carry everything in the associated channe= l. However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffre= y (Zhaohui) Zhang > >; Alexander Vainshtein > >; S= tewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after=20the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a whil= e. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >>=20PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forward= ing. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the=20LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model.= > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= https://clicktime.symantec.com/3G18FNxso3yysVeGE2oYas86H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fclicktime.symantec.com%2F32ELHVPxdZe1= NeGCU5oipbG6H2%3Fu%3Dhttps%2A3A%2A25__%3BJSU%21%21NEt6yMaO-gk%21QiStnftbs7= rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMnORLvEs%24> > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2= > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. --_000_MW4PR03MB63954ECABD96C12A7A7F9447F60A9MW4PR03MB6395namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

John,

“Great minds th= ink alike”.

 

Regarding your aside = comment on RFC 8662:

The last para of Section 4.3 of RFC 6790 says:

 

   As stated in Sections 4.1 an=
d 5, an egress LSR th=
at signals both ELC
 &=
nbsp; and implicit null MUST pop the ELI and the next label (which sh=
ould
&n=
bsp;  be the EL), if it encounters a packet with the ELI as the topmo=
st
&n=
bsp;  label.  Any other LSR (including PHP LSRs) MUST drop such =
packets, as
   per Section 3.18 of [RFC30=
31].

 

All that is needed is= to clarify the (rather, self-evident) rules for SIDs for which the origin= ating routers  effectively signal Implicit Null  (explicitly or = implicitly), including:

1.       All Adj-SIDs

2.       All EPE SIDs

3.       IGP Prefix SIDs that have been advertised with PHP (P-flag cle= ared in IS-IS, NP-flag cleared in OSPF)

4.       BGP Prefix SIDs advertised with Implicit Null in the NLRI of&n= bsp; the BGP-LU route.

 

I do not think that I= have missed anything (Binding SIDs are not involved in PHP).

 

My 2c,

Sasha

 

Office: +972-39266302=

Cell:  &nbs= p;   +972-549266302

Email:   Al= exander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>= ;
Sent: Monday, June 21, 2021 3:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa= Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey = (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is p= roposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transi= t LSR should do when it finds an [ELI, EL] pair at the top of the MPLS lab= el stack, either when it understands the label pair or when it doesn't.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From:=20mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>= ;
Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

= [External Em= ail. Be cautious of content]

 

Loa,

Regarding your question “Would you include= adding a copy of the GAL higher up in the stack to make sure that it is w= ithin readable depth for any LSR?”  my answer is NO.=

 

I have already said on this thread that if GAL i= s exposed as ToS but not BoS to an existing standards-compliant MPLS forwa= rder, it will not know how to handle it since such handling has not ever b= een defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an o= ld implementation that received a ToS GAL not at BoS would at best throw a= n exception or worst be unpredictable”.  Neither of these optio= ns sounds optimistic to me.

 

I also do not favor investing into a technique t= hat would guarantee that packets with GAL in the middle of the stack only = pass thru new LSRs that know how to handle them .

 

However, it is quite possible to do the followin= g IMHO:

  1. Retain the exist= ing definitions of GAL just at BoS and ACH that immediately follows the Bo= S
  2. Define new ACH types that can carry new ancillary data, and the structure= s that can be used for this purpose (as you have said, “we can carry= everything in the associated channel”, including TLVs and Sub-TLVs,= if necessary – it will be up to the specific applications to proces= s such structures in ACH, but at least this would not affect MPLS forwardi= ng).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogniz= e new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way
  4. Also allow usage of TTL to help L= ERs that recognize new ACH types to meddle with the information carried in= the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the= depth of the stack.

 

I cannot say whether this approach is good enoug= h for the specific set of applications. But it looks to me as reasonably s= afe=20since it does not require any new forwarding functionality in existi= ng LERs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-5492663= 02

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu> Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gma= il.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:=

> Loa and all,

>

> I fully agree with the proposal "to no= t tamper with ACH anymore".

>

>  From my POV, this includes (by implic= ation) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL highe= r up in the stack to make sure that it is within readable depth for any LS= R?

>

> As for the question " If the slot imme= diately after the label stack is

> reserved for the ACH does this mean the no = other ancillary data may be

> inserted in this position, e.g. MPLS EH's, = given that there is a GAL

> in the stack" the answer, IMHO, is YES= .

>

> However, it is quite possible to carry any = kind of new information in

> the ACH, similar to the way this has been d= one in Section 3 of RFC

> 8169

> <https://clicktime.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dh= ttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everythin= g in the associated channel. However there can only one ACH per packet, ri= ght?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-54= 9266302

>

> Email:   Alexander.Vainshtein= @rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu<= /span>>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong= @futurewei.com>; Jeffrey (Zhaohui) Zhang

> <zz= hang=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.= Vainshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@= gmail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators i= n the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:=

>

>  > My opinion is to not tamper with= ACH anymore because it's designed

> for control channel only and so far for a s= pecial scenario. The

> constraints on=20GAL and format of ACH are = hard to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible= to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appea= rs immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label sta= ck is reserved for the ACH

> does this mean the no other ancillary data = maybe inserted in this

>=20position, e.g. MPLS EH's, given that ther= e is a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----<= /o:p>

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpl= s-bounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:= 02 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Al= exander

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.co= m

> <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

>

>  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT a= ddress multiple indicators in the

> stack and multiple sets of ancillary data a= fter the BoS.

>

>  >

>

>  > I think the earlier emails of th= is email thread were talking about

> multiple indicators in the stack; for multi= ple set of ancillary data

> after the BoS, either the extended ACH or t= he proposed MPLS/generic

> extension headers or a merge of those propo= sals should be able to

> handle it. This is alluded to the DataAfter= BOS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----<= /o:p>

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10= :46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <= zzhang@juniper.net

> <<= span style=3D"color:windowtext;text-decoration:none">mailto:zzhang@juniper= .net>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.co= m

> <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

>

>  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email.=20Be cautious o= f content]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but= it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues t= o sort out around the GAL/ACH pair,

> and I was worried about a set of other indi= cators and the data that

> they might want to put "after the BoS&= quot;. So far I have seen no real

> effort to address the interference's this m= ight lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zh= aohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could = put a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = ; |            = ;            &= nbsp;     ACH       = ;            &= nbsp;         

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = ; |            = ;             = ACH TLV Header          =             &n= bsp;

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = ; |            = ;            &= nbsp;           &nb= sp;            &nbs= p;            =  

> ~

>

>  >>

>

>  >>     = ; ~            = ;         zero or more ACH TLVs&nb= sp;            = ;       

> ~

>

>  >>

>

>  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = ; |            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

> ~

>

>  >>

>

>  >>     = ; ~            = ;            G-ACh = Message           &= nbsp;           &nb= sp; 

> ~

>

>  >>

>

>  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = ;            &= nbsp;       Figure 2: G-ACh Packet Payload

>

>  >>

>

>  >> If the GAL does not have S-b= it set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in = the above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-o= ctet field has the S-bit set, the

> transit

>

>  >> LSR will think the label sta= ck ends there even though that's just

>

>  >> part of the ACH.<= /p>

>

>  >>

>

>  >> Or are you saying that a GAL= not at the BoS will not have the ACH

>

>  >> following it?

=

>

>  >

>

>  > Well, as far as I understand a G= AL which does not have the NoS-bit

> set will have other labels after itself. Th= e BoS-bit will be found

> deeper down stack and the ACH will immediat= ely fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I= 'd like to see the DT address

> multiple indicators in the stack and multip= le sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the= relevant questiuons first, and

> start working on solutions after that.=

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailt= o:mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 2= 021 5:07 AM

>

>  >> *To:* Stewart Bryant <ste= wart.bryant@gmail.com

> <mailto:stewart.= bryant@gmail.com>>

>

>  >> *Cc:* mpls@ietf= .org <mailto:mpls@ietf.org><= /o:p>

>

>  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

>

>  >> ancillary data after the BoS=

>

>  >>

>

>  >> *[External Email. Be cautiou= s of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your stat= ement that "an old implementation that

>

>  >> received a ToS GAL not at Bo= S would at best throw an exception or

>

>  >> worst be unpredictable"= .

>

>  >>

>

>  >> Regarding your statement &qu= ot;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of th= e LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths= that found the GAL at ToS were known

> to

>

>  >> be able to process it correc= tly":

>

>  >>

>

>  >>   1. I fully agree= with this statement as a general restriction  2.

>

>  >> Quite a lot of things have t= o be done in order to make this

>

>  >>     = ; restriction work including at least:

>

>  >>

>

>  >>     = ;  1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     = ;     BoS must be provided

>

>  >>     = ;  2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     = ;     IGP and BGP must be defined

>

>  >>     = ;  3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     = ;     process GAL correctly must be provided for diffe= rent

> techniques

>

>  >>     = ;     (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

>

>  >>

>

>  >> It is still possible that, a= fter all this work, we shall find out

>

>  >> that the benefits of support= ing GAL at ToS but not BoS will be

> only

>

>  >> available in the networks wh= ere all the nodes support the new

>

>  >> functionality because presen= ce of non-supporting nodes imposes too

>

>  >> many restrictions on connect= ivity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    = ;  +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein= @rbbn.com

> <mailto:Ale= xander.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainsht= ein@rbbn.com

> <mailto:Ale= xander.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <st= ewart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gm= ail.com

> <mailto:stewart.= bryant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 2= 021 10:36 AM

>

>  >> *To:* Alexander Vainshtein &= lt;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainsht= ein@rbbn.com

> <mailto:Ale= xander.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gm= ail.com

> <mailto:stewart.= bryant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.= mirsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zt= etx.com

> <mailto:gregory.= mirsky@ztetx.com>>;

> mpls@ietf.org <<= a href=3D"mailto:mpls@ietf.org">mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>= ;>

>

>  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

>

>  >> ancillary data after the BoS=

>

>  >>

>

>  >>     = ; On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = ; <Alexander.Vainshtein@rbbn.com

>

>  >>     = ; <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Ale= xander.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = ; While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = ; try and investigate how the existing systems will handle GAL

> being

>

>  >>     = ; not the BoS label.

>

>  >>

>

>  >>     = ; */[[Sasha]] Great minds think alike! One useful step could be=

>

>  >>     = ; collecting the known actual behavior of popular

> implementations in

>

>  >>     = ; this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = ; think?/*

>

>  >>

>

>  >> That is actually a considera= ble amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old i= mplementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw a= n exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed process= ing model is to take the context of

> the

>

>  >> PW label or PW+FAT label, di= scover the GAL and then process the

> GAL

>

>  >> in the context of the PW lab= el.

>

>  >>

>

>  >> When we extended GAL to appl= y to LSPs we again had the model that

> the

>

>  >> GAL operated in the context = of the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up t= he stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that= knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that= does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eit= her in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the rece= iving node is unpredictable, but in

> any

>

>  >> well written implementation = should just result in the packet being

>

>  >> dropped and counted as with = any other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is = OK to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the L= SP ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths= that found the GAL at ToS were known

> to

>

>  >> be able to process it correc= tly.

>

>  >>

>

>  >> A GAL not at BoS and not at = ToS should not be inspected or

> processed

>

>  >> by any LSR that did not know= what it was doing, and to attempt to

>

>  >> precess it would be a violat= ion of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together= with any attachments may contain

>

>  >> information of Ribbon Commun= ications Inc. and its Affiliates that

> is

>

>  >> confidential and/or propriet= ary for the sole use of the intended

>

>  >> recipient. Any review, discl= osure, reliance or distribution by

> others

>

>  >> or forwarding without expres= s permission is strictly prohibited.

> If

>

>  >> you are not the intended rec= ipient, please notify the sender

>

>  >> immediately and then delete = all copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> ____________________________= ___________________

>

>  >> mpls mailing list=

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org><= /p>

>

>  >>

> https://clicktime.sy= mantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= /p>

> <https://clicktime.symantec.com/32ELHVPx= dZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com= %2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.= org%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8o= b1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01= %7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240= 189c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3= d8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3= F6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson   &= nbsp;           &nb= sp;        email: loa@pi.nu=

> <mailto:loa@pi.nu>= ;

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com<= /span> <mailto:loa.pi.nu@gmail.com>= ;

>

>  > Bronze Dragon Consulting &n= bsp;           phone: +4= 6 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > ________________________________= _______________

>

>  > mpls mailing list

=

>

>  > mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sy= mantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2=

> <https://clicktime.symantec.com/353Ka7if= LCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%2= 52Fmpls%26data%3D04%257C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a= 24092e29708d931a0e327%257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0= %257C637595389337881384%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD= AiLCJQIjoiV2luMzIiLCJBTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3D= XQlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved= %3D0

>

>  >

>

> --

>

> Loa Andersson     =             &n= bsp;      email: loa@pi.nu=

> <mailto:loa@pi.nu>= ;

>

> Senior MPLS Expert loa.pi.nu@gmail.com<= /span> <mailto:loa.pi.nu@gmail.com>= ;

>

> Bronze Dragon Consulting   &= nbsp;         phone: +46 739 81 21= 64

>

>

> Notice: This e-mail together with any attac= hments may contain

> information of Ribbon Communications Inc. a= nd its Affiliates that is

> confidential and/or proprietary for the sol= e use of the intended

> recipient. Any review, disclosure, reliance= or distribution by others

> or forwarding without express permission is= strictly prohibited. If

> you are not the intended recipient, please = notify the sender

> immediately and then delete all copies, inc= luding any attachments.

 

--

 

Loa Andersson      = ;             =      email: loa@pi.nu=

Senior MPLS Expert     =             &n= bsp;        loa.pi.nu@gmail.com<= /span>

Bronze Dragon Consulting    =          phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express permission is strictly prohibited. I= f you are not the intended recipient, please notify the sender immediately= and then delete all copies, including any attachments.


Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments.
--_000_MW4PR03MB63954ECABD96C12A7A7F9447F60A9MW4PR03MB6395namp_-- From nobody Mon Jun 21 09:08:13 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 136E03A0DB5 for ; Mon, 21 Jun 2021 09:08:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.785 X-Spam-Level: X-Spam-Status: No, score=-0.785 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EF5JJDskxQ2A for ; Mon, 21 Jun 2021 09:08:06 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.70.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 84BD63A0D3A for ; Mon, 21 Jun 2021 09:08:04 -0700 (PDT) Received: from opfednr02.francetelecom.fr (unknown [xx.xx.xx.66]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by opfednr21.francetelecom.fr (ESMTP service) with ESMTPS id 4G7vZS5zdJz5vtw; Mon, 21 Jun 2021 18:08:00 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1624291680; bh=w3G7679fbCMT/LUYLX3gdC0KJ1pzJDtm73I1JpXFHdw=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=oPoSfTul0PgsQBO68BxugFRcWX5WRC8haTpw52Sul9e+SXgXPwLQns8meVX9pRut5 7/H+O5ULWJp6d+OW+GbktKVhAsOdhVFKBaMWoWKF1Y5PEbpaDp8hbsCaVLSio5324Z 7gCCYtPrBjgRZw1/E/yYGp9Yi6NNwtL6t/mEWLcCaLSrMnQYDw3PfhNUz6apkSKmA8 G5PLbV1u9B5CKBaIkgs/I9aB+qwKu+PcP2cby46SaLwGiYmYTMHaOhBWSwzDw9QOUm 31p58g4EH9NQOEXNOCN4Oji2HE/Wentyy1hFWbi4akRu2l+VyhoIekD4ugqTTy2aKh HEUJ7xCXouJCQ== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opfednr02.francetelecom.fr (ESMTP service) with ESMTPS id 4G7vZS4ZCsz8sYK; Mon, 21 Jun 2021 18:08:00 +0200 (CEST) From: To: John E Drake , Alexander Vainshtein , Loa Andersson CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rmz8bFcB45u0+GX6eUo5f23asX0EoAgAAZVICAAFZpgIAACH8AgAAEQgCAACAGgIAFz3SAgAAEUoCAAAW7AIAACtKAgAAeZRCAADZkgA== Date: Mon, 21 Jun 2021 16:07:59 +0000 Message-ID: <22670_1624291680_60D0B960_22670_356_5_53C29892C857584299CBF5D05346208A4CDF2F2B@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A4CDF2F2BOPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 16:08:12 -0000 --_000_53C29892C857584299CBF5D05346208A4CDF2F2BOPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable > As an aside, RFC 8662 does not define what a transit LSR should do when i= t finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. I believe it does: - if it does not understand ELI (i.e. does not support RFC 8662) it drops t= he packet as per Section 3.18 of [RFC3031]. - if it understands ELI (i.e. supports RFC 8662), it processes the EL, ELI = pair as defined in https://datatracker.ietf.org/doc/html/rfc6790#section-4.= 1 (The 2nd paragraph explicitly covers the case where the top label is the = ELI). (Note that in this case, since the ELI is the top label that LSR is a= ctually an LER with PHP enabled) Regards, --Bruno From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of John E Drake Sent: Monday, June 21, 2021 2:52 PM To: Alexander Vainshtein ; Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart has responded that "an old implementat= ion that received a ToS GAL not at BoS would at best throw an exception or = worst be unpredictable". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cannot detect presence of GAL at BoS due = to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/353Ka7ifLCb9e7KAz= jZ4fsf6H2?u=3Dhttps*3A*252__;JSU!!NEt6yMaO-gk!QiStnftbs7rzJ6JZRtxhV6LZks_wN= vQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A4CDF2F2BOPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

> As an aside, = RFC 8662 does not define what a transit LSR should do when it finds an [ELI= , EL] pair at the top of the MPLS label stack, either when it understands t= he label pair or when it doesn't.

 

I believe it does:

- if it does not understand ELI (i.e. does not s=
upport RFC 8662) it drops the packet as per Section 3.18 of [RFC3031].

- if it understands ELI (i.e. supports RFC 8662), it processes the EL, ELI pair as defined in https://datatracker.ietf.org/doc/html/rfc6790#section-4.1 (The 2nd= paragraph explicitly covers the case where the top label is the ELI)= . (Note that in this case, since the ELI is the top label that LSR is actua= lly an LER with PHP enabled)

 

Regards,

--Bruno

 

 

From: mpls [mailto:mpls-bounces@ietf.org] On Beh= alf Of John E Drake
Sent: Monday, June 21, 2021 2:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa = Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is proposing what I was p= roposing several months ago.

 

As an aside, RFC 8662 does not define what a transit LSR should do when = it finds an [ELI, EL] pair at the top of the MPLS label stack, either when = it understands the label pair or when it doesn't.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Lato;color:black;= mso-ansi-language:EN-US">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include adding a copy of the= GAL higher up in the stack to make sure that it is within readable depth f= or any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is exposed as ToS but = not BoS to an existing standards-compliant MPLS forwarder, it will not know= how to handle it since such handling has not ever been defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique that would guarantee t= hat packets with GAL in the middle of the stack only pass thru new LSRs tha= t know how to handle them .

 

However, it is quite possible to do the following IMHO:

  1. Retain the existing definitions of GAL just at BoS and ACH t= hat immediately follows the BoS
  2. Define= new ACH types that can carry new ancillary data, and the structures that c= an be used for this purpose (as you have said, “we can carry everything in the associated channel= 221;, including TLVs and Sub-TLVs, if necessary – it will be up to th= e specific applications to process such structures in ACH, but at least thi= s would not affect MPLS forwarding).
  3. A= llow LERs that (a) can detect presence of GAL at BoS and (b) recognize new = ACH types to meddle with the information carried in the ACH while forwarding labeled packets in the usual way<= /o:p>
  4. = Also allow usage of TTL to help LERs that r= ecognize new ACH types to meddle with the information carried in the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough for the specific se= t of applications. But it looks to me as reasonably safe since it does not = require any new forwarding functionality in existing LERs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@rbbn.= com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:

> Loa and all,

>

> I fully agree with the proposal "to not tamper with ACH any= more".

>

>  From my POV, this includes (by implication) not tampering = also with

> GAL as well.

 

Would you include adding a copy of the GAL higher up in the stack to = make sure that it is within readable depth for any LSR?

>

> As for the question " If the slot immediately after the lab= el stack is

> reserved for the ACH does this mean the no other ancillary data = may be

> inserted in this position, e.g. MPLS EH's, given that there is a= GAL

> in the stack" the answer, IMHO, is YES.

>

> However, it is quite possible to carry any kind of new informati= on in

> the ACH, similar to the way this has been done in Section 3 of R= FC

> 8169

> <https://clicktime.symant= ec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2F= doc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything in the associated c= hannel. However there can only one ACH per packet, right?=

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549266302

>

> Email:   Alexander.Vainshtein@rbbn.c= om

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: m= pls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancil= lary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:

>

>  > My opinion is to not tamper with ACH anymore because = it's designed

> for control channel only and so far for a special scenario. The

> constraints on GAL and format of ACH are hard to adapt to the ne= w use

> case requirements.

>

>  >

>

> I think this is a position that is possible to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appears immediately after = the bottom

> of the label stack."

>

> If the slot immediately after the label stack is reserved for th= e ACH

> does this mean the no other ancillary data maybe inserted in this

> position, e.g. MPLS EH's, given that there is a GAL in the stack= ?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bou= nces@ietf.org <mailto:mpls-bounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:02 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexander

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] Indicators in the stac= k and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT address multiple indic= ators in the

> stack and multiple sets of ancillary data after the BoS.

>

>  >

>

>  > I think the earlier emails of this email thread were = talking about

> multiple indicators in the stack; for multiple set of ancillary = data

> after the BoS, either the extended ACH or the proposed MPLS/gene= ric

> extension headers or a merge of those proposals should be able to

> handle it. This is alluded to the DataAfterBOS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <= ;loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] Indicators in the stac= k and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of content]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but it is intended to ad= dress the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to sort out around the= GAL/ACH pair,

> and I was worried about a set of other indicators and the data t= hat

> they might want to put "after the BoS". So far I have = seen no real

> effort to address the interference's this might lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could put a GAL not at a Bo= S:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =   ACH           = ;            &n= bsp;     

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;         ACH TLV Header &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =             &nb= sp;             = ;         

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;     zero or more ACH TLVs    &n= bsp;            = ;   

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;            =             &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =             &nb= sp;            =          

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;        G-ACh Message  &nbs= p;            &= nbsp;         

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;            =             &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>        &n= bsp;            = ;    Figure 2: G-ACh Packet Payload

>

>  >>

>

>  >> If the GAL does not have S-bit set, wouldn't a tr= ansit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in the above Figure) aft= er that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-octet fiel= d has the S-bit set, the

> transit

>

>  >> LSR will think the label stack ends there even th= ough that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL not at the BoS will = not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GAL which does not hav= e the NoS-bit

> set will have other labels after itself. The BoS-bit will be fou= nd

> deeper down stack and the ACH will immediately fo9llow the BoS.<= o:p>

>

>  >

>

>  > Yes there are issues here, but I'd like to see the DT= address

> multiple indicators in the stack and multiple sets of ancillary = data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the relevant questiuons = first, and

> start working on solutions after that.

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto:mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 2021 5:07 AM

>

>  >> *To:* Stewart Bryant <stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in th= e stack and

>

>  >> ancillary data after the BoS

>

>  >>

>

>  >> *[External Email. Be cautious of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your statement that "an o= ld implementation that

>

>  >> received a ToS GAL not at BoS would at best throw= an exception or

>

>  >> worst be unpredictable".

>

>  >>

>

>  >> Regarding your statement "it is OK to have m= ultiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the LSP ensured that al= l LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths that found the GAL a= t ToS were known

> to

>

>  >> be able to process it correctly":=

>

>  >>

>

>  >>   1. I fully agree with this statement = as a general restriction  2.

>

>  >> Quite a lot of things have to be done in order to= make this

>

>  >>      restriction work in= cluding at least:

>

>  >>

>

>  >>       1. The defini= tion of correct processing of GAL at ToS but

> not at

>

>  >>        &n= bsp; BoS must be provided

>

>  >>       2. Advertisem= ent of ability to process GAL not at BoS

> correctly in

>

>  >>        &n= bsp; IGP and BGP must be defined

>

>  >>       3. Ability to= set up network-wide paths that only cross

> nodes that

>

>  >>        &n= bsp; process GAL correctly must be provided for different

> techniques

>

>  >>        &n= bsp; (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

>

>  >>

>

>  >> It is still possible that, after all this work, w= e shall find out

>

>  >> that the benefits of supporting GAL at ToS but no= t BoS will be

> only

>

>  >> available in the networks where all the nodes sup= port the new

>

>  >> functionality because presence of non-supporting = nodes imposes too

>

>  >> many restrictions on connectivity and/or resilien= ce.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:      +972-5492= 66302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@rbbn.c= om

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <stewart.bryant@gmail.co= m

>

>  >> <mailto:stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 2021 10:36 AM

>

>  >> *To:* Alexander Vainshtein <Alexander.Vainshte= in@rbbn.com

>

>  >> <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stewart.bryant@gmail.com=

>

>  >> <mailto:stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com<= /a>

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in th= e stack and

>

>  >> ancillary data after the BoS

>

>  >>

>

>  >>      On 17 Jun 2021, at = 07:45, Alexander Vainshtein

>

>  >>      <Alexander.Vains= htein@rbbn.com

>

>  >>      <mailto:Alexande= r.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>      While that might be= the case, I think that the Open DT may

> give it a

>

>  >>      try and investigate= how the existing systems will handle GAL

> being

>

>  >>      not the BoS label.<= o:p>

>

>  >>

>

>  >>      */[[Sasha]] Great m= inds think alike! One useful step could be

>

>  >>      collecting the know= n actual behavior of popular

> implementations in

>

>  >>      this case, say, by = running a survey among the vendors - what

> do you

>

>  >>      think?/*=

>

>  >>

>

>  >> That is actually a considerable amount of work th= at will take a while.

>

>  >>

>

>  >> It seems to me that an old implementation that re= ceived a ToS GAL

> not

>

>  >> at BoS would at best throw an exception or worst = be unpredictable.

>

>  >>

>

>  >> The original assumed processing model is to take = the context of

> the

>

>  >> PW label or PW+FAT label, discover the GAL an= d then process the

> GAL

>

>  >> in the context of the PW label.=

>

>  >>

>

>  >> When we extended GAL to apply to LSPs we again ha= d the model that

> the

>

>  >> GAL operated in the context of the LSP label that= preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up the stack is a new beh= aviour.

>

>  >>

>

>  >> If it arrives at an LSR that knows the new semant= ic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that does not know the ne= w semantic then

>

>  >>

>

>  >> a) An error has occurred either in setting up the= LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the receiving node is unpredi= ctable, but in

> any

>

>  >> well written implementation should just result in= the packet being

>

>  >> dropped and counted as with any other Mal-formed = packet.

>

>  >>

>

>  >> So I would think that it is OK to have multiple G= ALs and GALs not

> at

>

>  >> BoS IFF the creator of the LSP ensured that all L= SRs on the LSP,

>

>  >> including ECMP and FRR paths that found the GAL a= t ToS were known

> to

>

>  >> be able to process it correctly.

>

>  >>

>

>  >> A GAL not at BoS and not at ToS should not be ins= pected or

> processed

>

>  >> by any LSR that did not know what it was doing, a= nd to attempt to

>

>  >> precess it would be a violation of the normal MPL= S processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together with any attachments= may contain

>

>  >> information of Ribbon Communications Inc. and its= Affiliates that

> is

>

>  >> confidential and/or proprietary for the sole use = of the intended

>

>  >> recipient. Any review, disclosure, reliance or di= stribution by

> others

>

>  >> or forwarding without express permission is stric= tly prohibited.

> If

>

>  >> you are not the intended recipient, please notify= the sender

>

>  >> immediately and then delete all copies, including= any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _______________________________________________

>

>  >> mpls mailing list

>

>  >> m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >>

> h= ttps://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u= =3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253= A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flisti= nfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbe= BMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%7Chsong%40futurewei.= com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata= =3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&amp;res= erved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson      &nbs= p;            &= nbsp;    email: loa@pi.nu

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com&g= t;

>

>  > Bronze Dragon Consulting     = ;        phone: +46 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _______________________________________________<= /o:p>

>

>  > mpls mailing list

>

>  > m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >

> h= ttps://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u= =3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A= %252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%2= 57C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327= %257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C6375953893378813= 84%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ= BTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyP= MiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%3D0

>

>  >

>

> --

>

> Loa Andersson        &nb= sp;            =    email: loa@pi.nu

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com&g= t;

>

> Bronze Dragon Consulting      &nbs= p;      phone: +46 739 81 21 64

>

>

> Notice: This e-mail together with any attachments may contain

> information of Ribbon Communications Inc. and its Affiliates tha= t is

> confidential and/or proprietary for the sole use of the intended

> recipient. Any review, disclosure, reliance or distribution by o= thers

> or forwarding without express permission is strictly prohibited.= If

> you are not the intended recipient, please notify the sender

> immediately and then delete all copies, including any attachment= s.

 

--

 

Loa Andersson          &= nbsp;           &nbs= p; email: loa@pi.nu

Senior MPLS Expert        &nb= sp;            =      loa.pi.nu@gmail.com

Bronze Dragon Consulting       &nb= sp;     phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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boundary="_000_DM5PR1901MB215099E7D003BDB70249F24CFC0A9DM5PR1901MB2150_" MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 16:19:49 -0000 --_000_DM5PR1901MB215099E7D003BDB70249F24CFC0A9DM5PR1901MB2150_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Sasha, Thanks. 1. >> Define new ACH types that can carry new ancillary data, and the= structures that can be used for this purpose (as you have said, =93we can = carry everything in the associated channel=94, including TLVs and Sub-TLVs,= if necessary =96 it will be up to the specific applications to process suc= h structures in ACH, but at least this would not affect MPLS forwarding). [TS]: Yes, this proposal has floated already (with an increment to the vers= ion in the ACH header). Couple of comments: 1. How to deal with co-existence of already defined ACH type(s) with t= he new =93ancillary data=94 ACH type at the same time? i.e. carrying multip= le ACH(s) in same packet? 2. Packaging all ancillary data insider one ACH does it become hindran= ce to allowing some of the ancillary data be processed by some of the nodes= along the LSP path? 3. Would mixing hop-by-hop ancillary data and edge-to-edge ancillary d= ata in same ACH have further limitations? 4. There is an open item (from last week) on the DT to investigate whe= ther insertion at a transit router (i.e. adding ancillary data on transit n= ode) is doable by HW or even desirable. Would that be a new =93ancillary da= ta=94 ACH appended to an existing ACH in the same packet? Regards, Tarek On 6/21/21, 6:56 AM, "mpls" wrote: Loa, Regarding your question =93Would you include adding a copy of the GAL highe= r up in the stack to make sure that it is within readable depth for any LSR= ?=94 my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined =96 not in RFC 55= 86 and not anywhere else. St= ewart has responded that =93an old implementation that received a ToS GAL n= ot at BoS would at best throw an exception or worst be unpredictable=94. N= either of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the st= ructures that can be used for this purpose (as you have said, =93we can car= ry everything in the associated channel=94, including TLVs and Sub-TLVs, if= necessary =96 it will be up to the specific applications to process such s= tructures in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) reco= gnize new ACH types to meddle with the information carried in the ACH while= forwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types = to meddle with the information carried in the ACH (similar to what has been= done in RFC 8169) even if t= hey cannot detect presence of GAL at BoS due to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g ; Stewart Bryant Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > where G-ACH is= used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%252> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_DM5PR1901MB215099E7D003BDB70249F24CFC0A9DM5PR1901MB2150_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Hi Sasha,

 

Thanks.<= /span>

 

1.       >> De= fine new ACH types that can carry new ancillary data, and the structures th= at can be used for this purpose (as you have said, =93we can carry everythi= ng in the associated channel=94, including TLVs and Sub-TLVs, if necessary =96 it will be up to the specific applications = to process such structures in ACH, but at least this would not affect MPLS = forwarding).

[TS]: Yes, this pro= posal has floated already (with an increment to the version in the ACH head= er). Couple of comments:

1. &= nbsp;    How to deal= with co-existence of already defined ACH type(s) with the new =93ancillary= data=94 ACH type at the same time? i.e. carrying multiple ACH(s) in same p= acket?

2. &= nbsp;    Packaging a= ll ancillary data insider one ACH does it become hindrance to allowing some= of the ancillary data be processed by some of the nodes along the LSP path= ?

3. &= nbsp;    Would mixin= g hop-by-hop ancillary data and edge-to-edge ancillary data in same ACH hav= e further limitations?

4. &= nbsp;    There is an= open item (from last week) on the DT to investigate whether insertion at a= transit router (i.e. adding ancillary data on transit node) is doable by H= W or even desirable. Would that be a new =93ancillary data=94 ACH appended to an existing ACH in the same pac= ket?

 

Regards,=

Tarek

 

On 6/21/21, 6:56 AM, &quo= t;mpls" <mpls-bounces@ietf.org> wrote:



Loa,

Regarding your questio= n =93Would you include adding a copy of the GAL higher up in the stack to m= ake sure that it is within readable depth for any LSR?=94  my answer i= s NO.

 

I have already said on= this thread that if GAL is exposed as ToS but not BoS to an existing stand= ards-compliant MPLS forwarder, it will not know how to handle it since such= handling has not ever been defined =96 not in RFC 5= 586 and not anywhere else. Stewart has responded that =93an old impleme= ntation that received a ToS GAL not at BoS would at best throw an exception= or worst be unpredictable=94.  Neither of these options sounds optimistic to me.

 

I also do not favor in= vesting into a technique that would guarantee that packets with GAL in the = middle of the stack only pass thru new LSRs that know how to handle them .

 

However, it is quite p= ossible to do the following IMHO:

  1. Retain the exi= sting definitions of GAL just at BoS and ACH that immediately follows the B= oS

2.       Define new ACH types that can carry new ancillary d= ata, and the structures that can be used for this purpose (as you have said= , =93we can carry everything in the associated channel=94, including TLVs a= nd Sub-TLVs, if necessary =96 it will be up to the specific applications to process such structures in ACH, but = at least this would not affect MPLS forwarding).

3.       Allow LERs that (a) can detect presence of GAL at B= oS and (b) recognize new ACH types to meddle with the information carried i= n the ACH while forwarding labeled packets in the usual way

4.       Also allow usage of TTL to help LERs that recognize= new ACH types to meddle with the information carried in the ACH (similar t= o what has been done in RFC 8169) eve= n if they cannot detect presence of GAL at BoS due to the depth of the stac= k.

 

I cannot say whether t= his approach is good enough for the specific set of applications. But it lo= oks to me as reasonably safe since it does not require any new forwarding f= unctionality in existing LERs - primum non n= ocere.

 

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Ale= xander.Vainshtein@rbbn.com

 

 

-----Original Message-= ----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zhaohui= ) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <s= tewart.bryant@gmail.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, A= lexander Vainshtein wrote:

> Loa and all,=

>

> I fully agree wit= h the proposal "to not tamper with ACH anymore".

>

>  From my POV= , this includes (by implication) not tampering also with

> GAL as well.=

 

Would you include addi= ng a copy of the GAL higher up in the stack to make sure that it is within = readable depth for any LSR?

>

> As for the questi= on " If the slot immediately after the label stack is

> reserved for the = ACH does this mean the no other ancillary data may be

> inserted in this = position, e.g. MPLS EH's, given that there is a GAL

> in the stack"= ; the answer, IMHO, is YES.

>

> However, it is qu= ite possible to carry any kind of new information in

> the ACH, similar = to the way this has been done in Section 3 of RFC

> 8169 <= /p>

> <https://clicktime.symantec.com/3FFh4tSjB= eGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc= 8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means t= hat we can carry everything in the associated channel. However there can on= ly one ACH per packet, right?

 

/Loa

>

> Regards,

>

> Sasha<= /p>

>

> Office: +972-3926= 6302

>

> Cell:  =     +972-549266302

>

> Email:  = ; Alexander.Vainshtein@= rbbn.com

>

> -----Original Mes= sage-----

> From: Loa Anderss= on <loa@pi.nu>

> Sent: Monday, Jun= e 21, 2021 12:40 PM

> To: Haoyu Song &l= t;hsong@futurewei.com>; Jeffrey (Zhaohui) Z= hang

> <zzhang=3D40juniper.net@dmarc.ietf.org>= ; Alexander Vainshtein

> <Alexander.Vainshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gmail.com>

> Cc: mpls@ietf.org<= /a>

> Subject: Re: [mpl= s] [EXTERNAL] Indicators in the stack and ancillary

> data after the Bo= S

>

> Haoyu, DT

>

> On 17/06/2021 18:= 56, Haoyu Song wrote:

>

>  > My opi= nion is to not tamper with ACH anymore because it's designed

> for control chann= el only and so far for a special scenario. The

> constraints on GA= L and format of ACH are hard to adapt to the new use

> case requirements= .

>

>  >

>

> I think this is a= position that is possible to defend.

>

> One question thou= gh.

>

> RFC 5586 specifie= s "that the ACH appears immediately after the bottom

> of the label stac= k."

>

> If the slot immed= iately after the label stack is reserved for the ACH

> does this mean th= e no other ancillary data maybe inserted in this

> position, e.g. MP= LS EH's, given that there is a GAL in the stack?

>

> /Loa

>

>  > Thanks= !

>

>  > Haoyu<= o:p>

>

>  >

>

>  > -----O= riginal Message-----

>

>  > From: = mpls <mpls-bounces= @ietf.org <mailto:mpls-bounces@ietf.org>>

> On Behalf Of Jeff= rey (Zhaohui)

>

>  > Zhang<= o:p>

>

>  > Sent: = Thursday, June 17, 2021 8:02 AM

>

>  > To: Lo= a Andersson <loa@pi.nu <mailto:loa@pi.n= u>>; Alexander

> Vainshtein

>

>  > <Al= exander.Vainshtein@rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>>; Ste= wart Bryant

>

>  > <stewart.bryant@gm= ail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  > Subjec= t: Re: [mpls] [EXTERNAL] Indicators in the stack and

> ancillary

>

>  > data a= fter the BoS

>

>  >

>

>  > Hi Loa= ,

>

>  >

>

>  >> bu= t I'd like to see the DT address multiple indicators in the

> stack and multipl= e sets of ancillary data after the BoS.

>

>  >

>

>  > I thin= k the earlier emails of this email thread were talking about

> multiple indicato= rs in the stack; for multiple set of ancillary data

> after the BoS, ei= ther the extended ACH or the proposed MPLS/generic

> extension headers= or a merge of those proposals should be able to

> handle it. This i= s alluded to the DataAfterBOS wiki page.

>

>  >

>

>  > Thanks= .

>

>  >

>

>  > Jeffre= y

>

>  >

>

>  > -----O= riginal Message-----

>

>  > From: = Loa Andersson <loa@pi.nu <mailto:loa@pi= .nu>>

>

>  > Sent: = Thursday, June 17, 2021 10:46 AM

>

>  > To: Je= ffrey (Zhaohui) Zhang <zzhang@juniper.net

> <mailto:zzhang@juniper.net>>; Alexander Vainshtein=

>

>  > <Al= exander.Vainshtein@rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>>; Ste= wart Bryant

>

>  > <stewart.bryant@gm= ail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  > Subjec= t: Re: [mpls] [EXTERNAL] Indicators in the stack and

> ancillary

>

>  > data a= fter the BoS

>

>  >

>

>  > [Exter= nal Email. Be cautious of content]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Respon= ded to Jeffrey's mail, but it is intended to address the

> entire discussion= .

>

>  >

>

>  > There = seem to be enough issues to sort out around the GAL/ACH pair,

> and I was worried= about a set of other indicators and the data that

> they might want t= o put "after the BoS". So far I have seen no real

> effort to address= the interference's this might lead to.

>

>  >

>

>  > Furthe= r inline

>

>  >

>

>  >

>

>  > On 17/= 06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote:

>

>  >> Hi= ,

>

>  >>

>

>  >> It= 's not clear how we could put a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<= /p>

>

>  >>

>

>  >>&nb= sp;     |       &nbs= p;            &= nbsp;         ACH   =             &nb= sp;            =  

> |

>

>  >>

>

>  >>

>

>  >> +-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<= /p>

>

>  >>

>

>  >>&nb= sp;     |       &nbs= p;            &= nbsp;    ACH TLV Header      &= nbsp;           &nbs= p;    

> |

>

>  >>

>

>  >>

>

>  >> +-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<= /p>

>

>  >>

>

>  >>&nb= sp;     |       &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;    

> ~

>

>  >>

>

>  >>&nb= sp;     ~       &nbs= p;             = zero or more ACH TLVs         =            

> ~

>

>  >>

>

>  >>&nb= sp;     ~       &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    

> |

>

>  >>

>

>  >>

>

>  >> +-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<= /p>

>

>  >>

>

>  >>&nb= sp;     |       &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    

> ~

>

>  >>

>

>  >>&nb= sp;     ~       &nbs= p;            &= nbsp;   G-ACh Message       &n= bsp;            = ;     

> ~

>

>  >>

>

>  >>&nb= sp;     ~       &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    

> |

>

>  >>

>

>  >>

>

>  >> +-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<= /p>

>

>  >>

>

>  >>&nb= sp;            =             Figure 2= : G-ACh Packet Payload

>

>  >>

>

>  >> If= the GAL does not have S-bit set, wouldn't a transit LSR treat

> any

>

>  >> 4-= ocet field (i.e. those in the above Figure) after that GAL as a<= /p>

>

>  >> la= bel+TOS+S+TTL? If that 4-octet field has the S-bit set, the

> transit

>

>  >> LS= R will think the label stack ends there even though that's just<= /p>

>

>  >> pa= rt of the ACH.

>

>  >>

>

>  >> Or= are you saying that a GAL not at the BoS will not have the ACH<= /p>

>

>  >> fo= llowing it?

>

>  >

>

>  > Well, = as far as I understand a GAL which does not have the NoS-bit

> set will have oth= er labels after itself. The BoS-bit will be found

> deeper down stack= and the ACH will immediately fo9llow the BoS.

>

>  >

>

>  > Yes th= ere are issues here, but I'd like to see the DT address

> multiple indicato= rs in the stack and multiple sets of ancillary data

> after the BoS.

>

>  >

>

>  > I thin= k we need to nail down the relevant questiuons first, and

> start working on = solutions after that.

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Je= ffrey

>

>  >>

>

>  >> *F= rom:*mpls <mpls-bo= unces@ietf.org <mailto:mpls-bounces@ietf.org>>

> *On Behalf Of *Al= exander

>

>  >> Va= inshtein

>

>  >> *S= ent:* Thursday, June 17, 2021 5:07 AM

>

>  >> *T= o:* Stewart Bryant <stewart.bryant@gmail.com

> <mailto:stewart.bryant@gmail.com>>

>

>  >> *C= c:* mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >> *S= ubject:* Re: [mpls] [EXTERNAL] Indicators in the stack and

>

>  >> an= cillary data after the BoS

>

>  >>

>

>  >> *[= External Email. Be cautious of content]*

>

>  >>

>

>  >> St= ewart,

>

>  >>

>

>  >> I = fully agree with your statement that "an old implementation that<= /o:p>

>

>  >> re= ceived a ToS GAL not at BoS would at best throw an exception or<= /p>

>

>  >> wo= rst be unpredictable".

>

>  >>

>

>  >> Re= garding your statement "it is OK to have multiple GALs and GALs

> not

>

>  >> at= BoS IFF the creator of the LSP ensured that all LSRs on the

> LSP,

>

>  >> in= cluding ECMP and FRR paths that found the GAL at ToS were known

> to

>

>  >> be= able to process it correctly":

>

>  >>

>

>  >>&nb= sp;  1. I fully agree with this statement as a general restriction&nbs= p; 2.

>

>  >> Qu= ite a lot of things have to be done in order to make this

>

>  >>&nb= sp;     restriction work including at least:=

>

>  >>

>

>  >>&nb= sp;      1. The definition of correct processing o= f GAL at ToS but

> not at=

>

>  >>&nb= sp;         BoS must be provided

>

>  >>&nb= sp;      2. Advertisement of ability to process GA= L not at BoS

> correctly in=

>

>  >>&nb= sp;         IGP and BGP must be def= ined

>

>  >>&nb= sp;      3. Ability to set up network-wide paths t= hat only cross

> nodes that

>

>  >>&nb= sp;         process GAL correctly m= ust be provided for different

> techniques

>

>  >>&nb= sp;         (RSVP-TE, SR-TE, FlexAl= go. BGP-LU etc.)

>

>  >>

>

>  >> It= is still possible that, after all this work, we shall find out<= /p>

>

>  >> th= at the benefits of supporting GAL at ToS but not BoS will be

> only

>

>  >> av= ailable in the networks where all the nodes support the new

>

>  >> fu= nctionality because presence of non-supporting nodes imposes too=

>

>  >> ma= ny restrictions on connectivity and/or resilience.

>

>  >>

>

>  >> Re= gards,

>

>  >>

>

>  >> Sa= sha

>

>  >>

>

>  >> Of= fice: +972-39266302

>

>  >>

>

>  >> Ce= ll:      +972-549266302

>

>  >>

>

>  >> Em= ail: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>

>

>  >> &l= t;mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>>=

>

>  >>

>

>  >> *F= rom:*Stewart Bryant <stewart.bryant@gmail.com

>

>  >> &l= t;mailto:stewart.bryant@gmail.com

> <mailto:stewart.bryant@gmail.com>>>=

>

>  >> *S= ent:* Thursday, June 17, 2021 10:36 AM

>

>  >> *T= o:* Alexander Vainshtein <Alexander.Vainshtein@rbbn.com

>

>  >> &l= t;mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>>><= o:p>

>

>  >> *C= c:* Stewart Bryant <stewart.bryant@gmail.com

>

>  >> &l= t;mailto:stewart.bryant@gmail.com

> <mailto:stewart.bryant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mirsky@ztetx.com>

>

>  >> &l= t;mailto:gregory.mirsky@ztetx.com

> <mailto:gregory.mirsky@ztetx.com>>;

> mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >> &l= t;mailto:mpls@ietf.org <mailto:mpl= s@ietf.org>>

>

>  >> *S= ubject:* Re: [mpls] [EXTERNAL] Indicators in the stack and

>

>  >> an= cillary data after the BoS

>

>  >>

>

>  >>&nb= sp;     On 17 Jun 2021, at 07:45, Alexander Vainshtein<= o:p>

>

>  >>&nb= sp;     <Alexander.Vainshtein@rbbn.com

>

>  >>&nb= sp;     <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexander.Vainshtein@rbbn.com>>> = wrote:

>

>  >>

>

>  >>&nb= sp;     While that might be the case, I think that the = Open DT may

> give it a

>

>  >>&nb= sp;     try and investigate how the existing systems wi= ll handle GAL

> being<= /p>

>

>  >>&nb= sp;     not the BoS label.

>

>  >>

>

>  >>&nb= sp;     */[[Sasha]] Great minds think alike! One useful= step could be

>

>  >>&nb= sp;     collecting the known actual behavior of popular

> implementations i= n

>

>  >>&nb= sp;     this case, say, by running a survey among the v= endors - what

> do you=

>

>  >>&nb= sp;     think?/*

>

>  >>

>

>  >> Th= at is actually a considerable amount of work that will take a while.

>

>  >>

>

>  >> It= seems to me that an old implementation that received a ToS GAL

> not

>

>  >> at= BoS would at best throw an exception or worst be unpredictable.=

>

>  >>

>

>  >> Th= e original assumed processing model is to take the context of

> the

>

>  >> PW= label or PW+FAT label, discover the GAL and then process the

> GAL

>

>  >> in= the context of the PW label.

>

>  >>

>

>  >> Wh= en we extended GAL to apply to LSPs we again had the model that

> the

>

>  >> GA= L operated in the context of the LSP label that preceded it for<= /p>

>

>  >> co= ntext. It was still BoS.

>

>  >>

>

>  >> Pu= tting the GAL further up the stack is a new behaviour.

>

>  >>

>

>  >> If= it arrives at an LSR that knows the new semantic all is good.

>

>  >>

>

>  >> If= it arrives at an LSR that does not know the new semantic then

>

>  >>

>

>  >> a)= An error has occurred either in setting up the LSP, or in forwarding.=

>

>  >>

>

>  >> b)= The behaviour at the receiving node is unpredictable, but in

> any

>

>  >> we= ll written implementation should just result in the packet being=

>

>  >> dr= opped and counted as with any other Mal-formed packet.

>

>  >>

>

>  >> So= I would think that it is OK to have multiple GALs and GALs not

> at

>

>  >> Bo= S IFF the creator of the LSP ensured that all LSRs on the LSP,

>

>  >> in= cluding ECMP and FRR paths that found the GAL at ToS were known

> to

>

>  >> be= able to process it correctly.

>

>  >>

>

>  >> A = GAL not at BoS and not at ToS should not be inspected or

> processed

>

>  >> by= any LSR that did not know what it was doing, and to attempt to<= /p>

>

>  >> pr= ecess it would be a violation of the normal MPLS processing model.

>

>  >>

>

>  >> - = Stewart

>

>  >>

>

>  >>

>

>  >> No= tice: This e-mail together with any attachments may contain

>

>  >> in= formation of Ribbon Communications Inc. and its Affiliates that

> is

>

>  >> co= nfidential and/or proprietary for the sole use of the intended

>

>  >> re= cipient. Any review, disclosure, reliance or distribution by

> others=

>

>  >> or= forwarding without express permission is strictly prohibited.

> If

>

>  >> yo= u are not the intended recipient, please notify the sender

>

>  >> im= mediately and then delete all copies, including any attachments.=

>

>  >>

>

>  >>

>

>  >> Ju= niper Business Use Only

>

>  >>

>

>  >>

>

>  >> __= _____________________________________________

>

>  >> mp= ls mailing list

>

>  >> mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://click= time.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>=

>

>  >>

> 2F%2Fnam11.safeli= nks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252

>

>  >> F%= 252Furld

>

>  >>

> efense.com%2Fv3%2= F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2

>

>  >> F<= o:p>

>

>  >>

> mpls__%3B!!NEt6yM= aO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A<= o:p>

>

>  >>

> nexFnPevXopeK1a6u= %24&amp;data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d

>

>  >> e<= o:p>

>

>  >>

> 9585a24092e29708d= 931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0

>

>  >> %<= o:p>

>

>  >>

> 7C637595389337881= 384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I<= o:p>

>

>  >>

> joiV2luMzIiLCJBTi= I6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G<= o:p>

>

>  >> df= ux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa An= dersson           &n= bsp;            emai= l: loa@pi.nu

> <mailt= o:loa@pi.nu>

>

>  > Senior= MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

>  > Bronze= Dragon Consulting         &nb= sp;   phone: +46 739 81 21 64

>

>  >

>

>  > Junipe= r Business Use Only

>

>  > ______= _________________________________________

>

>  > mpls m= ailing list

>

>  > mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://click= time.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  > <= /o:p>

> F%2Fnam11.safelin= ks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F%

>

>  > <= /o:p>

> 252Fwww.ietf.org%= 252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01%

>

>  > <= /o:p>

> 257Chsong%2540fut= urewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0

>

>  > <= /o:p>

> fee8ff2a3b240189c= 753a1d5591fedc%257C1%257C0%257C637595389337881384%257

>

>  > <= /o:p>

> CUnknown%257CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I

>

>  > <= /o:p>

> k1haWwiLCJXVCI6Mn= 0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7G= G4O8VGESnw%253D%26reserved%3D0

>

>  >

>

> --

>

> Loa Andersson&nbs= p;            &= nbsp;          email: loa@pi.nu

> <mailt= o:loa@pi.nu>

>

> Senior MPLS Exper= t loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

> Bronze Dragon Con= sulting           &n= bsp; phone: +46 739 81 21 64

>

>

> Notice: This e-ma= il together with any attachments may contain

> information of Ri= bbon Communications Inc. and its Affiliates that is

> confidential and/= or proprietary for the sole use of the intended

> recipient. Any re= view, disclosure, reliance or distribution by others

> or forwarding wit= hout express permission is strictly prohibited. If

> you are not the i= ntended recipient, please notify the sender

> immediately and t= hen delete all copies, including any attachments.

 

--

 

Loa Andersson &nb= sp;             = ;         email: loa@pi.nu

Senior MPLS Expert&nbs= p;            &= nbsp;            loa.pi.nu@gmail.com

Bronze Dragon Consulti= ng             = phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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Mon, 21 Jun 2021 16:34:12 +0000 From: Haoyu Song To: Alexander Vainshtein , Loa Andersson CC: "mpls@ietf.org" , "Jeffrey (Zhaohui) Zhang" , Stewart Bryant Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rm7nMf9KuVWE2klFLLNHKj8asX0EoAgAAZVICAAFZpgIAACH8AgAAEQgCAAB7mQIAF0JSAgAAEUoCAAG5u0A== Date: Mon, 21 Jun 2021 16:34:12 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: rbbn.com; dkim=none (message not signed) header.d=none;rbbn.com; dmarc=none action=none header.from=futurewei.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2ea5caf9-27d9-4a50-2c3e-08d934d266f9 x-ms-traffictypediagnostic: BY3PR13MB4963: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4941; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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boundary="_000_BY3PR13MB47874940E69DA28669C6ABC5B60A9BY3PR13MB4787namp_" MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR13MB4787.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2ea5caf9-27d9-4a50-2c3e-08d934d266f9 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2021 16:34:12.2339 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qb8UuiIQ200kWBaUYu3Qe56pIOFbabT6u71DUoJYFbi+50TKCE14k8tP91Cv48ysBP/c5xQfgZb4BFqy0Ug63A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY3PR13MB4963 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 16:34:22 -0000 --_000_BY3PR13MB47874940E69DA28669C6ABC5B60A9BY3PR13MB4787namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Loa and all, Yes, I think ACH and EH are mutual exclusive, so are the GAL and EHI. Haoyu From: Alexander Vainshtein Sent: Monday, June 21, 2021 2:55 AM To: Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g ; Stewart Bryant Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Loa and all, I fully agree with the proposal "to not tamper with ACH anymore". >From my POV, this includes (by implication) not tampering also with GAL as = well. As for the question " If the slot immediately after the label stack is rese= rved for the ACH does this mean the no other ancillary data may be inserted= in this position, e.g. MPLS EH's, given that there is a GAL in the stack" = the answer, IMHO, is YES. However, it is quite possible to carry any kind of new information in the A= CH, similar to the way this has been done in Section 3 of RFC 8169 where G-ACH is used for r= esidence time measurement. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 12:40 PM To: Haoyu Song >; Jeffrey (= Zhaohui) Zhang >; Alexander Vainshtein >; Stewart Bryant > Cc: mpls@ietf.org Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Haoyu, DT On 17/06/2021 18:56, Haoyu Song wrote: > My opinion is to not tamper with ACH anymore because it's designed for co= ntrol channel only and so far for a special scenario. The constraints on GA= L and format of ACH are hard to adapt to the new use case requirements. > I think this is a position that is possible to defend. One question though. RFC 5586 specifies "that the ACH appears immediately after the bottom of th= e label stack." If the slot immediately after the label stack is reserved for the ACH does = this mean the no other ancillary data maybe inserted in this position, e.g.= MPLS EH's, given that there is a GAL in the stack? /Loa > Thanks! > Haoyu > > -----Original Message----- > From: mpls > On Behal= f Of Jeffrey (Zhaohui) > Zhang > Sent: Thursday, June 17, 2021 8:02 AM > To: Loa Andersson >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Hi Loa, > >> but I'd like to see the DT address multiple indicators in the stack and = multiple sets of ancillary data after the BoS. > > I think the earlier emails of this email thread were talking about multip= le indicators in the stack; for multiple set of ancillary data after the Bo= S, either the extended ACH or the proposed MPLS/generic extension headers o= r a merge of those proposals should be able to handle it. This is alluded t= o the DataAfterBOS wiki page. > > Thanks. > > Jeffrey > > -----Original Message----- > From: Loa Andersson > > Sent: Thursday, June 17, 2021 10:46 AM > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > [External Email. Be cautious of content] > > > DT, > > Responded to Jeffrey's mail, but it is intended to address the entire dis= cussion. > > There seem to be enough issues to sort out around the GAL/ACH pair, and I= was worried about a set of other indicators and the data that they might w= ant to put "after the BoS". So far I have seen no real effort to address th= e interference's this might lead to. > > Further inline > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: >> Hi, >> >> It's not clear how we could put a GAL not at a BoS: >> >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH | >> >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ACH TLV Header | >> >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ zero or more ACH TLVs ~ >> >> ~ | >> >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | ~ >> >> ~ G-ACh Message ~ >> >> ~ | >> >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> Figure 2: G-ACh Packet Payload >> >> If the GAL does not have S-bit set, wouldn't a transit LSR treat any >> 4-ocet field (i.e. those in the above Figure) after that GAL as a >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the transit >> LSR will think the label stack ends there even though that's just >> part of the ACH. >> >> Or are you saying that a GAL not at the BoS will not have the ACH >> following it? > > Well, as far as I understand a GAL which does not have the NoS-bit set wi= ll have other labels after itself. The BoS-bit will be found deeper down st= ack and the ACH will immediately fo9llow the BoS. > > Yes there are issues here, but I'd like to see the DT address multiple in= dicators in the stack and multiple sets of ancillary data after the BoS. > > I think we need to nail down the relevant questiuons first, and start wor= king on solutions after that. > > /Loa >> >> Jeffrey >> >> *From:*mpls > *On Be= half Of *Alexander >> Vainshtein >> *Sent:* Thursday, June 17, 2021 5:07 AM >> *To:* Stewart Bryant > >> *Cc:* mpls@ietf.org >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and >> ancillary data after the BoS >> >> *[External Email. Be cautious of content]* >> >> Stewart, >> >> I fully agree with your statement that "an old implementation that >> received a ToS GAL not at BoS would at best throw an exception or >> worst be unpredictable". >> >> Regarding your statement "it is OK to have multiple GALs and GALs not >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly": >> >> 1. I fully agree with this statement as a general restriction 2. >> Quite a lot of things have to be done in order to make this >> restriction work including at least: >> >> 1. The definition of correct processing of GAL at ToS but not at >> BoS must be provided >> 2. Advertisement of ability to process GAL not at BoS correctly in >> IGP and BGP must be defined >> 3. Ability to set up network-wide paths that only cross nodes that >> process GAL correctly must be provided for different techniques >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) >> >> It is still possible that, after all this work, we shall find out >> that the benefits of supporting GAL at ToS but not BoS will be only >> available in the networks where all the nodes support the new >> functionality because presence of non-supporting nodes imposes too >> many restrictions on connectivity and/or resilience. >> >> Regards, >> >> Sasha >> >> Office: +972-39266302 >> >> Cell: +972-549266302 >> >> Email: Alexander.Vainshtein@rbbn.com >> >> >> *From:*Stewart Bryant > > >> *Sent:* Thursday, June 17, 2021 10:36 AM >> *To:* Alexander Vainshtein > > >> *Cc:* Stewart Bryant > >; gregory.mirsky@ztetx.com >> ; mpls@ietf.org >> >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and >> ancillary data after the BoS >> >> On 17 Jun 2021, at 07:45, Alexander Vainshtein >> > > wrote: >> >> While that might be the case, I think that the Open DT may give it = a >> try and investigate how the existing systems will handle GAL being >> not the BoS label. >> >> */[[Sasha]] Great minds think alike! One useful step could be >> collecting the known actual behavior of popular implementations in >> this case, say, by running a survey among the vendors - what do you >> think?/* >> >> That is actually a considerable amount of work that will take a while. >> >> It seems to me that an old implementation that received a ToS GAL not >> at BoS would at best throw an exception or worst be unpredictable. >> >> The original assumed processing model is to take the context of the >> PW label or PW+FAT label, discover the GAL and then process the GAL >> in the context of the PW label. >> >> When we extended GAL to apply to LSPs we again had the model that the >> GAL operated in the context of the LSP label that preceded it for >> context. It was still BoS. >> >> Putting the GAL further up the stack is a new behaviour. >> >> If it arrives at an LSR that knows the new semantic all is good. >> >> If it arrives at an LSR that does not know the new semantic then >> >> a) An error has occurred either in setting up the LSP, or in forwarding. >> >> b) The behaviour at the receiving node is unpredictable, but in any >> well written implementation should just result in the packet being >> dropped and counted as with any other Mal-formed packet. >> >> So I would think that it is OK to have multiple GALs and GALs not at >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, >> including ECMP and FRR paths that found the GAL at ToS were known to >> be able to process it correctly. >> >> A GAL not at BoS and not at ToS should not be inspected or processed >> by any LSR that did not know what it was doing, and to attempt to >> precess it would be a violation of the normal MPLS processing model. >> >> - Stewart >> >> >> Notice: This e-mail together with any attachments may contain >> information of Ribbon Communications Inc. and its Affiliates that is >> confidential and/or proprietary for the sole use of the intended >> recipient. Any review, disclosure, reliance or distribution by others >> or forwarding without express permission is strictly prohibited. If >> you are not the intended recipient, please notify the sender >> immediately and then delete all copies, including any attachments. >> >> >> Juniper Business Use Only >> >> >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fclickti= me.symantec.com%2F32ELHVPxdZe1NeGCU5oipbG6H2%3Fu%3Dhttps%253A%2525&data=3D0= 4%7C01%7Chsong%40futurewei.com%7C42cd0f1c948b4a6ee41f08d9349ab686%7C0fee8ff= 2a3b240189c753a1d5591fedc%7C1%7C0%7C637598661371423261%7CUnknown%7CTWFpbGZs= b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C10= 00&sdata=3DrjJlDBAtnPuKvyqJHlsVWCDDYyO9Xbq5hfh4TT64q3s%3D&reserved=3D0> >> 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 >> F%252Furld >> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 >> F >> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 >> A >> nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d >> e >> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 >> % >> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ >> I >> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij >> G >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 >> > > -- > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 > > Juniper Business Use Only > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fclickti= me.symantec.com%2F353Ka7ifLCb9e7KAzjZ4fsf6H2%3Fu%3Dhttps%253A%25252&data=3D= 04%7C01%7Chsong%40futurewei.com%7C42cd0f1c948b4a6ee41f08d9349ab686%7C0fee8f= f2a3b240189c753a1d5591fedc%7C1%7C0%7C637598661371433221%7CUnknown%7CTWFpbGZ= sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1= 000&sdata=3D9NTIe5iaRxlv7Nhm5S37gsJJHyrqXUa33QBoY8LeKEA%3D&reserved=3D0> > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR13MB47874940E69DA28669C6ABC5B60A9BY3PR13MB4787namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Loa and all,

 

Yes, I think ACH and EH are mutual exclusive, so are= the GAL and EHI.

 

Haoyu

 

From: Alexander Vainshtein <Alexander.Vain= shtein@rbbn.com>
Sent: Monday, June 21, 2021 2:55 AM
To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryan= t <stewart.bryant@gmail.com>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Loa and all,

 

I fully agree with the proposal "to not tamp= er with ACH anymore".

From my POV, this includes (by implication) not t= ampering also with GAL as well.

 

As for the question " If the slot immediatel= y after the label stack is reserved for the ACH does this mean the no other= ancillary data may be inserted in this position, e.g. MPLS EH's, given tha= t there is a GAL in the stack" the answer, IMHO, is YES.

 

However, it is quite possible to carry any kind o= f new information in the ACH, similar to the way this has been done in Section 3 of RFC 8169 where G-ACH is used for residence time measuremen= t.  

 

Regards,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 12:40 PM
To: Haoyu Song <hsong@futurewei.c= om>; Jeffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Alexan= der Vainshtein <Alexand= er.Vainshtein@rbbn.com>; Stewart Bryant <stewart.bry= ant@gmail.com>
Cc: mpls@ietf.org
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Haoyu, DT

 

On 17/06/2021 18:56, Haoyu Song wrote:=

> My opinion is to not tamper with ACH anymore= because it's designed for control channel only and so far for a special sc= enario. The constraints on GAL and format of ACH are hard to adapt to the n= ew use case requirements.

>

I think this is a position that is possible to de= fend.

 

One question though.

 

RFC 5586 specifies "that the ACH appears imm= ediately after the bottom of the label stack."

 

If the slot immediately after the label stack is = reserved for the ACH does this mean the no other ancillary data maybe inser= ted in this position, e.g. MPLS EH's, given that there is a GAL in the stac= k?

 

/Loa

 

> Thanks!

> Haoyu

>

> -----Original Message-----

> From: mpls <mpls-boun= ces@ietf.org> On Behalf Of Jeffrey (Zhaohui)

> Zhang

> Sent: Thursday, June 17, 2021 8:02 AM

> To: Loa Andersson <loa@pi.nu>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Hi Loa,

>

>> but I'd like to see the DT address multi= ple indicators in the stack and multiple sets of ancillary data after the B= oS.

>

> I think the earlier emails of this email thr= ead were talking about multiple indicators in the stack; for multiple set o= f ancillary data after the BoS, either the extended ACH or the proposed MPL= S/generic extension headers or a merge of those proposals should be able to handle it. This is alluded to the Dat= aAfterBOS wiki page.

>

> Thanks.

>

> Jeffrey

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Thursday, June 17, 2021 10:46 AM<= /o:p>

> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> [External Email. Be cautious of content]

>

>

> DT,

>

> Responded to Jeffrey's mail, but it is inten= ded to address the entire discussion.

>

> There seem to be enough issues to sort out a= round the GAL/ACH pair, and I was worried about a set of other indicators a= nd the data that they might want to put "after the BoS". So far I= have seen no real effort to address the interference's this might lead to.

>

> Further inline

>

>

> On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang= wrote:

>> Hi,

>> 

>> It's not clear how we could put a GAL no= t at a BoS:

>> 

>>     

>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+

>> 

>>      | &nb= sp;            =             &nb= sp;   ACH         &n= bsp;            = ;        |

>> 

>>     

>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+

>> 

>>      | &nb= sp;            =            ACH TLV Header=             &nb= sp;           |

>> 

>>     

>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+

>> 

>>      | &nb= sp;            =             &nb= sp;            =              &n= bsp;          ~

>> 

>>      ~ &nb= sp;            =        zero or more ACH TLVs   = ;            &n= bsp;     ~

>> 

>>      ~ &nb= sp;            =             &nb= sp;            =             &nb= sp;           |

>> 

>>     

>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+

>> 

>>      | &nb= sp;            =             &nb= sp;            =             &nb= sp;           ~

>> 

>>      ~ &nb= sp;            =           G-ACh Message &= nbsp;           &nbs= p;            ~=

>> 

>>      ~ &nb= sp;            =             &nb= sp;            =             &nb= sp;           |

>> 

>>     

>> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+

>> 

>>       = ;            &n= bsp;     Figure 2: G-ACh Packet Payload

>> 

>> If the GAL does not have S-bit set, woul= dn't a transit LSR treat any

>> 4-ocet field (i.e. those in the above Fi= gure) after that GAL as a

>> label+TOS+S+TTL? If that 4-octet field h= as the S-bit set, the transit

>> LSR will think the label stack ends ther= e even though that's just

>> part of the ACH.

>> 

>> Or are you saying that a GAL not at the = BoS will not have the ACH

>> following it?

>

> Well, as far as I understand a GAL which doe= s not have the NoS-bit set will have other labels after itself. The BoS-bit= will be found deeper down stack and the ACH will immediately fo9llow the B= oS.

>

> Yes there are issues here, but I'd like to s= ee the DT address multiple indicators in the stack and multiple sets of anc= illary data after the BoS.

>

> I think we need to nail down the relevant qu= estiuons first, and start working on solutions after that.

>

> /Loa

>> 

>> Jeffrey

>> 

>> *From:*mpls <mpls= -bounces@ietf.org> *On Behalf Of *Alexander

>> Vainshtein

>> *Sent:* Thursday, June 17, 2021 5:07 AM<= o:p>

>> *To:* Stewart Bryant <stewart.bryant@gmail.com>

>> *Cc:* <= span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org

>> *Subject:* Re: [mpls] [EXTERNAL] Indicat= ors in the stack and

>> ancillary data after the BoS<= /p>

>> 

>> *[External Email. Be cautious of content= ]*

>> 

>> Stewart,

>> 

>> I fully agree with your statement that &= quot;an old implementation that

>> received a ToS GAL not at BoS would at b= est throw an exception or

>> worst be unpredictable".=

>> 

>> Regarding your statement "it is OK = to have multiple GALs and GALs not

>> at BoS IFF the creator of the LSP ensure= d that all LSRs on the LSP,

>> including ECMP and FRR paths that found = the GAL at ToS were known to

>> be able to process it correctly":

>> 

>>   1. I fully agree with this s= tatement as a general restriction  2.

>> Quite a lot of things have to be done in= order to make this

>>      restrictio= n work including at least:

>> 

>>       1. T= he definition of correct processing of GAL at ToS but not at

>>       = ;   BoS must be provided

>>       2. A= dvertisement of ability to process GAL not at BoS correctly in

>>       = ;   IGP and BGP must be defined

>>       3. A= bility to set up network-wide paths that only cross nodes that

>>       = ;   process GAL correctly must be provided for different techniqu= es

>>       = ;   (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

>> 

>> It is still possible that, after all thi= s work, we shall find out

>> that the benefits of supporting GAL at T= oS but not BoS will be only

>> available in the networks where all the = nodes support the new

>> functionality because presence of non-su= pporting nodes imposes too

>> many restrictions on connectivity and/or= resilience.

>> 

>> Regards,

>> 

>> Sasha

>> 

>> Office: +972-39266302

>> 

>> Cell:      +972= -549266302

>> 

>> Email: Alexander.Vainshtein@= rbbn.com

>> <mailto:A= lexander.Vainshtein@rbbn.com>

>> 

>> *From:*Stewart Bryant <stewart.bryant= @gmail.com

>> <mailto:stewar= t.bryant@gmail.com>>

>> *Sent:* Thursday, June 17, 2021 10:36 AM=

>> *To:* Alexander Vainshtein <Alexander= .Vainshtein@rbbn.com

>> <mailto:A= lexander.Vainshtein@rbbn.com>>

>> *Cc:* Stewart Bryant <stewart.bryant@= gmail.com

>> <mailto:stewar= t.bryant@gmail.com>>; gregory.mirsky@ztetx.com

>> <mailto:gregor= y.mirsky@ztetx.com>; mpls@ietf.org

>> <mailto:mpls@ietf.org>

>> *Subject:* Re: [mpls] [EXTERNAL] Indicat= ors in the stack and

>> ancillary data after the BoS<= /p>

>> 

>>      On 17 Jun = 2021, at 07:45, Alexander Vainshtein

>>      <Alexan= der.Vainshtein@rbbn.com

>>      <mailto:Alexander.Vainshtein@rbbn.com>&g= t; wrote:

>> 

>>      While that= might be the case, I think that the Open DT may give it a

>>      try and in= vestigate how the existing systems will handle GAL being

>>      not the Bo= S label.

>> 

>>      */[[Sasha]= ] Great minds think alike! One useful step could be

>>      collecting= the known actual behavior of popular implementations in

>>      this case,= say, by running a survey among the vendors - what do you

>>      think?/*

>> 

>> That is actually a considerable amount o= f work that will take a while.

>> 

>> It seems to me that an old implementatio= n that received a ToS GAL not

>> at BoS would at best throw an exception = or worst be unpredictable.

>> 

>> The original assumed processing model is= to take the context of the

>> PW label or PW+FAT label, discover the G= AL and then process the GAL

>> in the context of the PW label.

>> 

>> When we extended GAL to apply to LSPs we= again had the model that the

>> GAL operated in the context of the LSP l= abel that preceded it for

>> context. It was still BoS.

>> 

>> Putting the GAL further up the stack is = a new behaviour.

>> 

>> If it arrives at an LSR that knows the n= ew semantic all is good.

>> 

>> If it arrives at an LSR that does not kn= ow the new semantic then

>> 

>> a) An error has occurred either in setti= ng up the LSP, or in forwarding.

>> 

>> b) The behaviour at the receiving node i= s unpredictable, but in any

>> well written implementation should just = result in the packet being

>> dropped and counted as with any other Ma= l-formed packet.

>> 

>> So I would think that it is OK to have m= ultiple GALs and GALs not at

>> BoS IFF the creator of the LSP ensured t= hat all LSRs on the LSP,

>> including ECMP and FRR paths that found = the GAL at ToS were known to

>> be able to process it correctly.

>> 

>> A GAL not at BoS and not at ToS should n= ot be inspected or processed

>> by any LSR that did not know what it was= doing, and to attempt to

>> precess it would be a violation of the n= ormal MPLS processing model.

>> 

>> - Stewart

>> 

>> 

>> Notice: This e-mail together with any at= tachments may contain

>> information of Ribbon Communications Inc= . and its Affiliates that is

>> confidential and/or proprietary for the = sole use of the intended

>> recipient. Any review, disclosure, relia= nce or distribution by others

>> or forwarding without express permission= is strictly prohibited. If

>> you are not the intended recipient, plea= se notify the sender

>> immediately and then delete all copies, = including any attachments.

>> 

>> 

>> Juniper Business Use Only

>> 

>> 

>> ________________________________________= _______

>> mpls mailing list

>> mpls@ietf.org

>> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

>> 2F%2Fnam11.safelinks.protection.outlook.= com%2F%3Furl%3Dhttps%253A%252

>> F%252Furld

>> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ie= tf.org%2Fmailman%2Flistinfo%2

>> F

>> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-= q8ob1JglFKOP6qKkgAcCSPbeBMMj2

>> A

>> nexFnPevXopeK1a6u%24&amp;data=3D04%7= C01%7Chsong%40futurewei.com%7Ccc49d

>> e

>> 9585a24092e29708d931a0e327%7C0fee8ff2a3b= 240189c753a1d5591fedc%7C1%7C0

>> %

>> 7C637595389337881384%7CUnknown%7CTWFpbGZ= sb3d8eyJWIjoiMC4wLjAwMDAiLCJQ

>> I

>> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3= D%7C1000&amp;sdata=3D5et4Juc3Ij

>> G

>> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&am= p;amp;reserved=3D0

>> 

>

> --

>

> Loa Andersson     &= nbsp;           &nbs= p;      email: loa@pi.nu<= o:p>

> Senior MPLS Expert    &n= bsp;            = ;         loa.pi.nu@gmail.com

> Bronze Dragon Consulting   &n= bsp;         phone: +46 739 81 21 6= 4

>

> Juniper Business Use Only

> ____________________________________________= ___

> mpls mailing list

> mpls@ietf.org

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

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> 252Fwww.ietf.org%252Fmailman%252Flistinfo%25= 2Fmpls%26data%3D04%257C01%

> 257Chsong%2540futurewei.com%257Ccc49de9585a2= 4092e29708d931a0e327%257C0

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%= 257C637595389337881384%257

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQIjoiV2luMzIiLCJBTiI6I

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DX= QlRpwkgODLRxcIjyMYyPMiCF2K

> DC0Y7GG4O8VGESnw%253D%26reserved%3D0

>

 

--

 

Loa Andersson      =             &nb= sp;     email: loa@pi.nu<= o:p>

Senior MPLS Expert     &= nbsp;           &nbs= p;        loa.pi.nu@gmail.com

Bronze Dragon Consulting    &= nbsp;        phone: +46 739 81 21 64


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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR13MB4787.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 19f0ee93-20ff-471a-6905-08d934d2eb34 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2021 16:37:54.1720 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: DKJEX8Gq2PLV1mFR+ruhozcYVpMxv6/t5VUEbcNZlrjUht5F4wSIEAVgb6DOa8Q4u7E86XHm8H34oJreKuUaaw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR13MB3062 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 16:38:10 -0000 Hi Bruno, For clarification, does it mean an entropy label must be present in the pac= ket? What if it doesn't have such a label? Thanks! Haoyu -----Original Message----- From: bruno.decraene@orange.com =20 Sent: Monday, June 21, 2021 1:50 AM To: Loa Andersson ; Jeffrey (Zhaohui) Zhang = ; Alexander Vainshtein ; Stewart Bryant ; draft-song-mpls-eh-indicator@ietf.org Cc: mpls@ietf.org Subject: RE: [mpls] Indicators in the stack and ancillary data after the Bo= S [+ authors of draft-song-mpls-eh-indicator] > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson >=20 > Jeffrey, >=20 >=20 > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > Hi Loa, > > > >> but I'd like to see the DT address multiple indicators in the stack=20 > >> and multiple > sets of ancillary data after the BoS. > > > > I think the earlier emails of this email thread were talking about=20 > > multiple indicators > in the stack; for multiple set of ancillary data after the BoS, either=20 > the extended ACH or the proposed MPLS/generic extension headers or a=20 > merge of those proposals should be able to handle it. This is alluded=20 > to the DataAfterBOS wiki page. >=20 > hmm - yes partly, but there are several indicators proposed in several=20 > drafts >=20 > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH indicator >=20 > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a=20 > special purpose label (FAI) as indicators >=20 > there has also been discussion about putting more than one GAL in=20 > the stack, i.e. differerent GALs pointing to different ACHs. >=20 > draft-many-mpls-multiple-gal proposes to add a copy of the GAL=20 > higher uop the stack so that LSRs with a too shallow maximun readable=20 > depth might reach the GAL >=20 > there has also been discussion about putting more than one GAL in=20 > the stack, i.e. differerent GALs pointing to different ACHs. >=20 > draft-song-mpls-eh-indicator have a list of potential indicators,=20 > that is also telling if the EH should be processed on every EH capable=20 > node or "just" at ingress and egress The following draft proposes a way to carry indicators. https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatra= cker.ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-label= -id%23section-2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b= 6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217= 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI= 6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK0XuDLugXG6yP6jRYIl= gbDuYrh%2B7uM%3D&reserved=3D0 It's short (less than one page) and backward compatible for LSR & LER. Referring to table 5 of draft-song-mpls-eh-indicator it also - does not require additional label assuming Entropy Label is already used= for load balancing - does not require an additional scarce resource (Special-Purpose MPLS Lab= el value) - allows location freedom - does not need control plane extension Could the authors of draft-song-mpls-eh-indicator update their table 5 in o= rder to include the above draft? Thanks, Regards, --Bruno =20 >=20 > The FAI might put ancillary data after the BoS. >=20 > I think we need to have a comprehensive discussion >=20 > - first what we want to have > - second how when re-direct by an indicator we find the > ancillary data that belongs to that indicator. >=20 > /Loa >=20 >=20 >=20 >=20 > > > > Thanks. > > > > Jeffrey > > > > -----Original Message----- > > From: Loa Andersson > > Sent: Thursday, June 17, 2021 10:46 AM > > To: Jeffrey (Zhaohui) Zhang ; Alexander=20 > > Vainshtein > ; Stewart Bryant=20 > > > Cc: mpls@ietf.org > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary=20 > > data after > the BoS > > > > [External Email. Be cautious of content] > > > > > > DT, > > > > Responded to Jeffrey's mail, but it is intended to address the=20 > > entire discussion. > > > > There seem to be enough issues to sort out around the GAL/ACH pair,=20 > > and I was worried about a set of other indicators and the data that=20 > > they might want to put "after the BoS". So far I have seen no real=20 > > effort to address the interference's this might lead to. > > > > Further inline > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > >> Hi, > >> > >> It's not clear how we could put a GAL not at a BoS: > >> > >> =20 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> | ACH | > >> > >> =20 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> | ACH TLV Header | > >> > >> =20 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> | ~ > >> > >> ~ zero or more ACH TLVs ~ > >> > >> ~ | > >> > >> =20 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> | ~ > >> > >> ~ G-ACh Message ~ > >> > >> ~ | > >> > >> =20 > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > >> > >> Figure 2: G-ACh Packet Payload > >> > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat=20 > >> any 4-ocet field (i.e. those in the above Figure) after that GAL as=20 > >> a > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the=20 > >> label+TOS+S+transit > >> LSR will think the label stack ends there even though that's just=20 > >> part of the ACH. > >> > >> Or are you saying that a GAL not at the BoS will not have the ACH=20 > >> following it? > > > > Well, as far as I understand a GAL which does not have the NoS-bit=20 > > set will have other labels after itself. The BoS-bit will be found=20 > > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > Yes there are issues here, but I'd like to see the DT address=20 > > multiple indicators in the stack and multiple sets of ancillary data af= ter the BoS. > > > > I think we need to nail down the relevant questiuons first, and=20 > > start working on solutions after that. > > > > /Loa > >> > >> Jeffrey > >> > >> *From:*mpls *On Behalf Of *Alexander=20 > >> Vainshtein > >> *Sent:* Thursday, June 17, 2021 5:07 AM > >> *To:* Stewart Bryant > >> *Cc:* mpls@ietf.org > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > >> ancillary data after the BoS > >> > >> *[External Email. Be cautious of content]* > >> > >> Stewart, > >> > >> I fully agree with your statement that "an old implementation that=20 > >> received a ToS GAL not at BoS would at best throw an exception or=20 > >> worst be unpredictable". > >> > >> Regarding your statement "it is OK to have multiple GALs and GALs=20 > >> not at BoS IFF the creator of the LSP ensured that all LSRs on the=20 > >> LSP, including ECMP and FRR paths that found the GAL at ToS were=20 > >> known to be able to process it correctly": > >> > >> 1. I fully agree with this statement as a general restriction > >> 2. Quite a lot of things have to be done in order to make this > >> restriction work including at least: > >> > >> 1. The definition of correct processing of GAL at ToS but not at > >> BoS must be provided > >> 2. Advertisement of ability to process GAL not at BoS correctly = in > >> IGP and BGP must be defined > >> 3. Ability to set up network-wide paths that only cross nodes th= at > >> process GAL correctly must be provided for different techniqu= es > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > >> > >> It is still possible that, after all this work, we shall find out =20 > >> that the benefits of supporting GAL at ToS but not BoS will be only=20 > >> available in the networks where all the nodes support the new=20 > >> functionality because presence of non-supporting nodes imposes too=20 > >> many restrictions on connectivity and/or resilience. > >> > >> Regards, > >> > >> Sasha > >> > >> Office: +972-39266302 > >> > >> Cell: +972-549266302 > >> > >> Email: Alexander.Vainshtein@rbbn.com > > >> > >> *From:*Stewart Bryant >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > >> *To:* Alexander Vainshtein >> > > >> *Cc:* Stewart Bryant >> >; gregory.mirsky@ztetx.com=20 > >> ; mpls@ietf.org=20 > >> > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > >> ancillary data after the BoS > >> > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > >> >> > wrote: > >> > >> While that might be the case, I think that the Open DT may give i= t a > >> try and investigate how the existing systems will handle GAL bein= g > >> not the BoS label. > >> > >> */[[Sasha]] Great minds think alike! One useful step could be > >> collecting the known actual behavior of popular implementations i= n > >> this case, say, by running a survey among the vendors - what do y= ou > >> think?/* > >> > >> That is actually a considerable amount of work that will take a while. > >> > >> It seems to me that an old implementation that received a ToS GAL=20 > >> not at BoS would at best throw an exception or worst be unpredictable. > >> > >> The original assumed processing model is to take the context of the=20 > >> PW label or PW+FAT label, discover the GAL and then process the GAL=20 > >> in the context of the PW label. > >> > >> When we extended GAL to apply to LSPs we again had the model that=20 > >> the GAL operated in the context of the LSP label that preceded it=20 > >> for context. It was still BoS. > >> > >> Putting the GAL further up the stack is a new behaviour. > >> > >> If it arrives at an LSR that knows the new semantic all is good. > >> > >> If it arrives at an LSR that does not know the new semantic then > >> > >> a) An error has occurred either in setting up the LSP, or in forwardin= g. > >> > >> b) The behaviour at the receiving node is unpredictable, but in any=20 > >> well written implementation should just result in the packet being=20 > >> dropped and counted as with any other Mal-formed packet. > >> > >> So I would think that it is OK to have multiple GALs and GALs not=20 > >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP,=20 > >> including ECMP and FRR paths that found the GAL at ToS were known=20 > >> to be able to process it correctly. > >> > >> A GAL not at BoS and not at ToS should not be inspected or=20 > >> processed by any LSR that did not know what it was doing, and to=20 > >> attempt to precess it would be a violation of the normal MPLS processi= ng model. > >> > >> - Stewart > >> > >> > >> Notice: This e-mail together with any attachments may contain=20 > >> information of Ribbon Communications Inc. and its Affiliates that=20 > >> is confidential and/or proprietary for the sole use of the intended=20 > >> recipient. Any review, disclosure, reliance or distribution by=20 > >> others or forwarding without express permission is strictly=20 > >> prohibited. If you are not the intended recipient, please notify=20 > >> the sender immediately and then delete all copies, including any attac= hments. > >> > >> > >> Juniper Business Use Only > >> > >> > >> _______________________________________________ > >> mpls mailing list > >> mpls@ietf.org > >> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Furld > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2F > mpls__%3B!!NEt6yM&data=3D04%7C01%7Chsong%40futurewei.com%7C08d722072 > 7794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C6 > 37598622176314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoi > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DzE3QHyImI86j7K > zn9PKE5qasAU01YKm%2FbbpXg6g4hAc%3D&reserved=3D0 > aO-gk!RVgTGVbknjgIjv3x- > q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ > >> > > > > -- > > > > Loa Andersson email: loa@pi.nu > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > Juniper Business Use Only > > >=20 > -- >=20 > Loa Andersson email: loa@pi.nu > Senior MPLS Expert loa.pi.nu@gmail.com > Bronze Dragon Consulting phone: +46 739 81 21 64 >=20 > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww. > ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40future > wei.com%7C08d7220727794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5 > 591fedc%7C1%7C1%7C637598622176324952%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiM > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&s > data=3Db7TztzRbKspQdyrJ8%2Btps6IeLQlCl3E0mrgvJRydlTk%3D&reserved=3D0 ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou = copies sans autorisation. Si vous avez recu ce message par erreur, veuillez= le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Le= s messages electroniques etant susceptibles d'alteration, Orange decline to= ute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used= or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Mon Jun 21 09:49:21 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B814C3A10EC; Mon, 21 Jun 2021 09:49:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.199 X-Spam-Level: X-Spam-Status: No, score=-0.199 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xW7poflFMaQd; Mon, 21 Jun 2021 09:49:14 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E7DAE3A10E9; Mon, 21 Jun 2021 09:49:13 -0700 (PDT) Received: from opfedar07.francetelecom.fr (unknown [xx.xx.xx.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by opfedar20.francetelecom.fr (ESMTP service) with ESMTPS id 4G7wV02DGRz8thd; Mon, 21 Jun 2021 18:49:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1624294152; bh=suTAAy3PF4j7gSe7BK6L/k/7IUeRFc93GvhEno1D0yI=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=PPluW3P0Y376WK52uydYNzRv8+aNAjTsHWYeROc1ApMXnWHmex+i+6N4gjpCHhDxK NXSXdmre2K53/+xWQyfElpaQICH3lWzCtQ3olblHm8cN0/6nftP9pcnq7snOKiVw6b OHx8KgVbXB4nei86n5yXyp9rbjXKUt3nJwa7DqaL/H4k9djQZ787Ms0SdTOsNT/q79 VMoIKSSxmc9BgR5ZCAXo50cA3TO+RW2wxyLvYbh+SboxjyyvwXP4bUnHS5ca65gKrW 52TO5Apjx4Lynk8wGvvs2yQVMiC1XNpDlQezSnnzEFpesmx6lClRf7OgfgwWGwbjqn kpy1pNpBvOEYg== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opfedar07.francetelecom.fr (ESMTP service) with ESMTPS id 4G7wTz6JKpz5vN0; Mon, 21 Jun 2021 18:49:11 +0200 (CEST) From: To: Haoyu Song , Loa Andersson , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant , "draft-song-mpls-eh-indicator@ietf.org" CC: "mpls@ietf.org" Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZnp1KmXm0GDTTUWo1eOKTl9pvqseqjHAgAAA0ZA= Date: Mon, 21 Jun 2021 16:49:10 +0000 Message-ID: <14386_1624294152_60D0C307_14386_277_1_53C29892C857584299CBF5D05346208A4CDF30CC@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <202106170323552620410@zte.com.cn> <1bd54f43-880e-07f9-93cd-7d0aba9266d0@pi.nu> <23638_1624265401_60D052B9_23638_17_1_53C29892C857584299CBF5D05346208A4CDF1B34@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 16:49:20 -0000 Hi Haoyu, > From: Haoyu Song [mailto:hsong@futurewei.com] >=20 > Hi Bruno, >=20 > For clarification, does it mean an entropy label must be present in the p= acket? Yes. (Both ELI and EL.) > What if it doesn't have such a label? The node requiring the indicator adds the Entropy Label (ELI, EL). I guess = same principle as the other options discussed in the Figure 5 of draft-song= -mpls-eh-indicator. In which case you get Entropy information for free (I mean no extra label).= But from the entropy standpoint, it would be better to have the EL, ELI pu= shed by the ingress as this is the node which should have the most entropy = information. Thanks, --Bruno > Thanks! >=20 > Haoyu >=20 > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Monday, June 21, 2021 1:50 AM > To: Loa Andersson ; Jeffrey (Zhaohui) Zhang ; > Alexander Vainshtein ; Stewart Bryant > ; draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after the = BoS >=20 > [+ authors of draft-song-mpls-eh-indicator] >=20 > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson > > > > Jeffrey, > > > > > > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the stack > > >> and multiple > > sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > > > multiple indicators > > in the stack; for multiple set of ancillary data after the BoS, either > > the extended ACH or the proposed MPLS/generic extension headers or a > > merge of those proposals should be able to handle it. This is alluded > > to the DataAfterBOS wiki page. > > > > hmm - yes partly, but there are several indicators proposed in several > > drafts > > > > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH indicator > > > > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a > > special purpose label (FAI) as indicators > > > > there has also been discussion about putting more than one GAL in > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > draft-many-mpls-multiple-gal proposes to add a copy of the GAL > > higher uop the stack so that LSRs with a too shallow maximun readable > > depth might reach the GAL > > > > there has also been discussion about putting more than one GAL in > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > draft-song-mpls-eh-indicator have a list of potential indicators, > > that is also telling if the EH should be processed on every EH capable > > node or "just" at ingress and egress >=20 > The following draft proposes a way to carry indicators. > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat= racker > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-label- > id%23section- > 2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b6895f808 > d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217 > 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK > 0XuDLugXG6yP6jRYIlgbDuYrh%2B7uM%3D&reserved=3D0 >=20 > It's short (less than one page) and backward compatible for LSR & LER. >=20 > Referring to table 5 of draft-song-mpls-eh-indicator it also > - does not require additional label assuming Entropy Label is already us= ed for > load balancing > - does not require an additional scarce resource (Special-Purpose MPLS L= abel > value) > - allows location freedom > - does not need control plane extension >=20 > Could the authors of draft-song-mpls-eh-indicator update their table 5 in= order to > include the above draft? >=20 > Thanks, > Regards, > --Bruno >=20 > > > > The FAI might put ancillary data after the BoS. > > > > I think we need to have a comprehensive discussion > > > > - first what we want to have > > - second how when re-direct by an indicator we find the > > ancillary data that belongs to that indicator. > > > > /Loa > > > > > > > > > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang ; Alexander > > > Vainshtein > > ; Stewart Bryant > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > > > data after > > the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > > > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > > > and I was worried about a set of other indicators and the data that > > > they might want to put "after the BoS". So far I have seen no real > > > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | = ~ > > >> > > >> ~ zero or more ACH TLVs = ~ > > >> > > >> ~ = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | = ~ > > >> > > >> ~ G-ACh Message = ~ > > >> > > >> ~ = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > > >> any 4-ocet field (i.e. those in the above Figure) after that GAL as > > >> a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > > >> label+TOS+S+transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > > > set will have other labels after itself. The BoS-bit will be found > > > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > > > multiple indicators in the stack and multiple sets of ancillary data = after the > BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > > > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > > >> not at BoS IFF the creator of the LSP ensured that all LSRs on the > > >> LSP, including ECMP and FRR paths that found the GAL at ToS were > > >> known to be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction > > >> 2. Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but not = at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS correctl= y in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross nodes = that > > >> process GAL correctly must be provided for different techni= ques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > > >> > > >> *From:*Stewart Bryant > >> > > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> > > > >> *Cc:* Stewart Bryant > >> >; gregory.mirsky@ztetx.com > > >> ; mpls@ietf.org > > >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> > wrote: > > >> > > >> While that might be the case, I think that the Open DT may give= it a > > >> try and investigate how the existing systems will handle GAL be= ing > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular implementations= in > > >> this case, say, by running a survey among the vendors - what do= you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a whil= e. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > > >> not at BoS would at best throw an exception or worst be unpredictabl= e. > > >> > > >> The original assumed processing model is to take the context of the > > >> PW label or PW+FAT label, discover the GAL and then process the GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > > >> the GAL operated in the context of the LSP label that preceded it > > >> for context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forward= ing. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > > >> to be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > > >> processed by any LSR that did not know what it was doing, and to > > >> attempt to precess it would be a violation of the normal MPLS proces= sing > model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > > >> is confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > > >> others or forwarding without express permission is strictly > > >> prohibited. If you are not the intended recipient, please notify > > >> the sender immediately and then delete all copies, including any att= achments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Furld > > > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo% > 2F > > > mpls__%3B!!NEt6yM&data=3D04%7C01%7Chsong%40futurewei.com%7C08d72 > 2072 > > > 7794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1% > 7C6 > > > 37598622176314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC > JQIjoi > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DzE3QHyImI86j > 7K > > zn9PKE5qasAU01YKm%2FbbpXg6g4hAc%3D&reserved=3D0 > > aO-gk!RVgTGVbknjgIjv3x- > > q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > > > > > -- > > > > Loa Andersson email: loa@pi.nu > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww. > > > ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40futur > e > > > wei.com%7C08d7220727794b6895f808d934919550%7C0fee8ff2a3b240189c753a1 > d5 > > > 591fedc%7C1%7C1%7C637598622176324952%7CUnknown%7CTWFpbGZsb3d8e > yJWIjoiM > > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&am > p;s > > > data=3Db7TztzRbKspQdyrJ8%2Btps6IeLQlCl3E0mrgvJRydlTk%3D&reserved=3D0 >=20 > ______________________________________________________________________ > ___________________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exp= loites ou > copies sans autorisation. 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR13MB4787.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0a905373-bbc1-4a97-8f92-08d934dc36ea X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2021 17:44:26.6963 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KAICBzYiRhOnXKxsTqXJiQjEfxzj5t0vpqiino+qTKcC5iXuxN1DUGvhKMQCj+vtgjUVljrVW+/r22h3GXnstw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR13MB3330 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 17:44:37 -0000 Hi Bruno,=20 Thanks for the clarification. We might have some issues using the forced bi= nding in some cases. For example, in our EH architecture, we allow an EH to= be inserted or removed at any nodes on an LSP. Also, ELI+EI are two labels= , which is more expensive than one SPL solution. Having said this, I could = list your proposal as a possible solution. BTW, Kireeti and I have discussed a possible option working in a different = way. We would use a new SPL to indicate multiples things (also by encoding the u= nused TTL/CoS bits): the existence of other special labels in the label sta= ck (e.g., ELI+EL) and the existence/location of extension headers after the= label stack. Since we have a new SPL, we have more freedom to define its b= ehavior.=20 Best, Haoyu -----Original Message----- From: bruno.decraene@orange.com =20 Sent: Monday, June 21, 2021 9:49 AM To: Haoyu Song ; Loa Andersson ; Jeffrey (Z= haohui) Zhang ; Alexander Vainshtein ; Stewart Bryant ; draft-song-mpls-e= h-indicator@ietf.org Cc: mpls@ietf.org Subject: RE: [mpls] Indicators in the stack and ancillary data after the Bo= S Hi Haoyu, > From: Haoyu Song [mailto:hsong@futurewei.com] >=20 > Hi Bruno, >=20 > For clarification, does it mean an entropy label must be present in the p= acket? Yes. (Both ELI and EL.) > What if it doesn't have such a label? The node requiring the indicator adds the Entropy Label (ELI, EL). I guess = same principle as the other options discussed in the Figure 5 of draft-song= -mpls-eh-indicator. In which case you get Entropy information for free (I mean no extra label).= But from the entropy standpoint, it would be better to have the EL, ELI pu= shed by the ingress as this is the node which should have the most entropy = information. Thanks, --Bruno > Thanks! >=20 > Haoyu >=20 > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Monday, June 21, 2021 1:50 AM > To: Loa Andersson ; Jeffrey (Zhaohui) Zhang=20 > ; Alexander Vainshtein=20 > ; Stewart Bryant=20 > ; draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after=20 > the BoS >=20 > [+ authors of draft-song-mpls-eh-indicator] >=20 > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson > > > > Jeffrey, > > > > > > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the=20 > > >> stack and multiple > > sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about=20 > > > multiple indicators > > in the stack; for multiple set of ancillary data after the BoS,=20 > > either the extended ACH or the proposed MPLS/generic extension=20 > > headers or a merge of those proposals should be able to handle it.=20 > > This is alluded to the DataAfterBOS wiki page. > > > > hmm - yes partly, but there are several indicators proposed in=20 > > several drafts > > > > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH indicator > > > > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a=20 > > special purpose label (FAI) as indicators > > > > there has also been discussion about putting more than one GAL in=20 > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > draft-many-mpls-multiple-gal proposes to add a copy of the GAL=20 > > higher uop the stack so that LSRs with a too shallow maximun=20 > > readable depth might reach the GAL > > > > there has also been discussion about putting more than one GAL in=20 > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > draft-song-mpls-eh-indicator have a list of potential indicators,=20 > > that is also telling if the EH should be processed on every EH=20 > > capable node or "just" at ingress and egress >=20 > The following draft proposes a way to carry indicators. > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata > tracker > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-labe > l- > id%23section- > 2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b6895f808 > d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217 > 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK > 0XuDLugXG6yP6jRYIlgbDuYrh%2B7uM%3D&reserved=3D0 >=20 > It's short (less than one page) and backward compatible for LSR & LER. >=20 > Referring to table 5 of draft-song-mpls-eh-indicator it also > - does not require additional label assuming Entropy Label is already=20 > used for load balancing > - does not require an additional scarce resource (Special-Purpose=20 > MPLS Label > value) > - allows location freedom > - does not need control plane extension >=20 > Could the authors of draft-song-mpls-eh-indicator update their table 5=20 > in order to include the above draft? >=20 > Thanks, > Regards, > --Bruno >=20 > > > > The FAI might put ancillary data after the BoS. > > > > I think we need to have a comprehensive discussion > > > > - first what we want to have > > - second how when re-direct by an indicator we find the > > ancillary data that belongs to that indicator. > > > > /Loa > > > > > > > > > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang ; Alexander=20 > > > Vainshtein > > ; Stewart Bryant=20 > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > > ancillary data after > > the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the=20 > > > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH=20 > > > pair, and I was worried about a set of other indicators and the=20 > > > data that they might want to put "after the BoS". So far I have=20 > > > seen no real effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | = ~ > > >> > > >> ~ zero or more ACH TLVs = ~ > > >> > > >> ~ = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | = ~ > > >> > > >> ~ G-ACh Message = ~ > > >> > > >> ~ = | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat=20 > > >> any 4-ocet field (i.e. those in the above Figure) after that GAL=20 > > >> as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the=20 > > >> label+TOS+S+transit > > >> LSR will think the label stack ends there even though that's just=20 > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH=20 > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit=20 > > > set will have other labels after itself. The BoS-bit will be found=20 > > > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address=20 > > > multiple indicators in the stack and multiple sets of ancillary=20 > > > data after the > BoS. > > > > > > I think we need to nail down the relevant questiuons first, and=20 > > > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls *On Behalf Of *Alexander=20 > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation=20 > > >> that received a ToS GAL not at BoS would at best throw an=20 > > >> exception or worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs=20 > > >> not at BoS IFF the creator of the LSP ensured that all LSRs on=20 > > >> the LSP, including ECMP and FRR paths that found the GAL at ToS=20 > > >> were known to be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction > > >> 2. Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but not = at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS correctl= y in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross nodes = that > > >> process GAL correctly must be provided for different techni= ques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out=20 > > >> that the benefits of supporting GAL at ToS but not BoS will be=20 > > >> only available in the networks where all the nodes support the=20 > > >> new functionality because presence of non-supporting nodes=20 > > >> imposes too many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > > >> > > >> *From:*Stewart Bryant > >> > > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> > > > >> *Cc:* Stewart Bryant > >> >; gregory.mirsky@ztetx.com=20 > > >> ; mpls@ietf.org=20 > > >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> > wrote: > > >> > > >> While that might be the case, I think that the Open DT may give= it a > > >> try and investigate how the existing systems will handle GAL be= ing > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular implementations= in > > >> this case, say, by running a survey among the vendors - what do= you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a whil= e. > > >> > > >> It seems to me that an old implementation that received a ToS GAL=20 > > >> not at BoS would at best throw an exception or worst be unpredictabl= e. > > >> > > >> The original assumed processing model is to take the context of=20 > > >> the PW label or PW+FAT label, discover the GAL and then process=20 > > >> the GAL in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that=20 > > >> the GAL operated in the context of the LSP label that preceded it=20 > > >> for context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forward= ing. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in=20 > > >> any well written implementation should just result in the packet=20 > > >> being dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not=20 > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the=20 > > >> LSP, including ECMP and FRR paths that found the GAL at ToS were=20 > > >> known to be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or=20 > > >> processed by any LSR that did not know what it was doing, and to=20 > > >> attempt to precess it would be a violation of the normal MPLS=20 > > >> processing > model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain=20 > > >> information of Ribbon Communications Inc. and its Affiliates that=20 > > >> is confidential and/or proprietary for the sole use of the=20 > > >> intended recipient. Any review, disclosure, reliance or=20 > > >> distribution by others or forwarding without express permission=20 > > >> is strictly prohibited. If you are not the intended recipient,=20 > > >> please notify the sender immediately and then delete all copies, inc= luding any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fur > > ld > > > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo% > 2F > > > mpls__%3B!!NEt6yM&data=3D04%7C01%7Chsong%40futurewei.com%7C08d72 > 2072 > > > 7794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1% > 7C6 > > > 37598622176314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC > JQIjoi > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DzE3QHyImI86j > 7K > > zn9PKE5qasAU01YKm%2FbbpXg6g4hAc%3D&reserved=3D0 > > aO-gk!RVgTGVbknjgIjv3x- > > q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > > > > > -- > > > > Loa Andersson email: loa@pi.nu > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww= . > > > ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40futur > e > > > wei.com%7C08d7220727794b6895f808d934919550%7C0fee8ff2a3b240189c753a1 > d5 > > > 591fedc%7C1%7C1%7C637598622176324952%7CUnknown%7CTWFpbGZsb3d8e > yJWIjoiM > > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&am > p;s > > > data=3Db7TztzRbKspQdyrJ8%2Btps6IeLQlCl3E0mrgvJRydlTk%3D&reserved=3D0 >=20 > ______________________________________________________________________ > ___________________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations=20 > confidentielles ou privilegiees et ne doivent donc pas etre diffuses,=20 > exploites ou copies sans autorisation. 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Mon, 21 Jun 2021 18:41:22 +0000 From: John E Drake To: "bruno.decraene@orange.com" , Alexander Vainshtein , Loa Andersson CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZremsXfIZcCGlEegrN7TXPgbtqseyI0A Date: Mon, 21 Jun 2021 18:41:22 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> <22670_1624291680_60D0B960_22670_356_5_53C29892C857584299CBF5D05346208A4CDF2F2B@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <22670_1624291680_60D0B960_22670_356_5_53C29892C857584299CBF5D05346208A4CDF2F2B@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-21T18:41:20Z; 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boundary="_000_BY3PR05MB80819BDB3646FD1B6B17516DC70A9BY3PR05MB8081namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR05MB8081.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ad7920af-9eeb-43df-7bfa-08d934e42a9b X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2021 18:41:22.0810 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 83BocsCs0/z85i3Y0PaDm27qV/x1X+6tKTgC0zpJmbBNQUQu3D6P7ceV7H7oEw4+/39u0OYmrQy15PNku/2/Dg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR05MB7359 X-Proofpoint-ORIG-GUID: QbYTiW-T1K5kv4hzsc3gLbQwhSkZQ1iY X-Proofpoint-GUID: QbYTiW-T1K5kv4hzsc3gLbQwhSkZQ1iY X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-21_10:2021-06-21, 2021-06-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 mlxscore=0 mlxlogscore=999 spamscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 impostorscore=0 adultscore=0 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106210108 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 18:41:35 -0000 --_000_BY3PR05MB80819BDB3646FD1B6B17516DC70A9BY3PR05MB8081namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, I'm familiar with the references, comments inline. Yours Irrespectively, John Juniper Business Use Only From: bruno.decraene@orange.com Sent: Monday, June 21, 2021 12:08 PM To: John E Drake ; Alexander Vainshtein ; Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g Subject: RE: [mpls] Indicators in the stack and ancillary data after the Bo= S [External Email. Be cautious of content] > As an aside, RFC 8662 does not define what a transit LSR should do when i= t finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. I believe it does: - if it does not understand ELI (i.e. does not support RFC 8662) it drops t= he packet as per Section 3.18 of [RFC3031]. [JD] This section does not define the behavior of a transit LSR that recei= ves a reserved label at the top of the MPLS label stack. - if it understands ELI (i.e. supports RFC 8662), it processes the EL, ELI = pair as defined in https://datatracker.ietf.org/doc/html/rfc6790#section-4.= 1 (The 2nd paragraph explicitly covers the case where th= e top label is the ELI). (Note that in this case, since the ELI is the top = label that LSR is actually an LER with PHP enabled) [JD] This section defines the behavior of an egress LSR that receives an [= ELI, EL] pair. It does not define the behavior of a transit LSR that recei= ves an [ELI, EL] at the top of the MPLS label stack. At the very least, RF= C 8662 should have defined which transit LSR, the LSR popping the SID above= the [ELI, EL] pair or the LSR receiving it should remove it and stipulatin= g that once that behavior is defined, ensuring that the subject transit rou= ter must understand entropy labels. My bigger point is that we are defining all sorts of nifty new functions wh= ile ignoring incremental deployment. If we edict that every LSR needs to u= nderstand every nifty new function before those functions may be deployed, = then we are ensuring that those nifty new functions will never be deployed. Regards, --Bruno From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of John E Drake Sent: Monday, June 21, 2021 2:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart has responded that "an old implementat= ion that received a ToS GAL not at BoS would at best throw an exception or = worst be unpredictable". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cannot detect presence of GAL at BoS due = to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/353Ka7ifLCb9e7KAz= jZ4fsf6H2?u=3Dhttps*3A*252__;JSU!!NEt6yMaO-gk!QiStnftbs7rzJ6JZRtxhV6LZks_wN= vQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_BY3PR05MB80819BDB3646FD1B6B17516DC70A9BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

I’m familiar with the references, comments inl= ine.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: bruno.decraene@orange.com <bruno.dec= raene@orange.com>
Sent: Monday, June 21, 2021 12:08 PM
To: John E Drake <jdrake@juniper.net>; Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang@juniper.net>
Subject: RE: [mpls] Indicators in the stack and ancillary data after= the BoS

 

<= span lang=3D"FR" style=3D"font-size:10.5pt;font-family:"Lato",san= s-serif;color:black">[External Email. Be cautious of content]

 

> As an aside, RFC 8662 does not define what a transit LSR should do w= hen it finds an [ELI, EL] pair at the top of the MPLS label stack, either w= hen it understands the label pair or when it doesn't.

 

I believe it does:

- if it does =
not understand ELI (i.e. does not support RFC 8662) it drops the packet as per Section 3.18 of [RFC3031].
 
[JD]  This section does not define the behavior of a trans=
it LSR that receives a reserved label at the top of the MPLS label stack. <=
o:p>
 

- if it understands ELI (i.e. supports RFC 8662), it = processes the EL, ELI pair as defined in https://datatracker.ietf.org/doc/html/rfc6790#section-4.1 (The 2nd= paragraph explicitly covers the case where the top label is the ELI)= . (Note that in this case, since the ELI is the top label that LSR is actua= lly an LER with PHP enabled)

 

[JD]  This section defines the behavior o= f an egress LSR that receives an [ELI, EL] pair.  It does not define t= he behavior of a transit LSR that receives an [ELI, EL] at the top of the M= PLS label stack.  At the very least, RFC 8662 should have defined which transit LSR, the LSR popping the SID above the [= ELI, EL] pair or the LSR receiving it should remove it and stipulating that= once that behavior is defined, ensuring that the subject transit router mu= st understand entropy labels.

 

My bigger point is that we are defining all so= rts of nifty new functions while ignoring incremental deployment.  If = we edict that every LSR needs to understand every nifty new function before= those functions may be deployed, then we are ensuring that those nifty new functions will never be deployed. &nb= sp; 

 

 

Regards,

--Bruno

 

 

From: mpls [mailto:mpls-bounces@ietf= .org] On Behalf Of John E Drake
Sent: Monday, June 21, 2021 2:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is pr= oposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transit= LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label= stack, either when it understands the label pair or when it doesn't.<= /o:p>

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include = adding a copy of the GAL higher up in the stack to make sure that it is wit= hin readable depth for any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is= exposed as ToS but not BoS to an existing standards-compliant MPLS forward= er, it will not know how to handle it since such handling has not ever been= defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique th= at would guarantee that packets with GAL in the middle of the stack only pa= ss thru new LSRs that know how to handle them .

 

However, it is quite possible to do the following= IMHO:

  1. Retain the existi= ng definitions of GAL just at BoS and ACH that immediately follows the BoS<= o:p>
  2. De= fine new ACH types that can carry new ancillary data, and the structures th= at can be used for this purpose (as you have said, “we can carry ever= ything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications to process= such structures in ACH, but at least this would not affect MPLS forwarding= ).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recognize ne= w ACH types to meddle with the information carried in the ACH while forward= ing labeled packets in the usual way
  4. Also allow usage of TTL to help LERs tha= t recognize new ACH types to meddle with the information carried in the ACH= (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough= for the specific set of applications. But it looks to me as reasonably saf= e since it does not require any new forwarding functionality in existing LE= Rs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:<= o:p>

> Loa and all,

>

> I fully agree with the proposal "to not= tamper with ACH anymore".

>

>  From my POV, this includes (by implica= tion) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR?=

>

> As for the question " If the slot immed= iately after the label stack is

> reserved for the ACH does this mean the no o= ther ancillary data may be

> inserted in this position, e.g. MPLS EH's, g= iven that there is a GAL

> in the stack" the answer, IMHO, is YES.=

>

> However, it is quite possible to carry any k= ind of new information in

> the ACH, similar to the way this has been do= ne in Section 3 of RFC

> 8169

> <https://clicktime.symant= ec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2F= doc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything= in the associated channel. However there can only one ACH per packet, righ= t?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549= 266302

>

> Email:   Alexander.Vainshtein@= rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:<= /o:p>

>

>  > My opinion is to not tamper with = ACH anymore because it's designed

> for control channel only and so far for a sp= ecial scenario. The

> constraints on GAL and format of ACH are har= d to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible = to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appear= s immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label stac= k is reserved for the ACH

> does this mean the no other ancillary data m= aybe inserted in this

> position, e.g. MPLS EH's, given that there i= s a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpls-b= ounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:0= 2 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexa= nder

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT ad= dress multiple indicators in the

> stack and multiple sets of ancillary data af= ter the BoS.

>

>  >

>

>  > I think the earlier emails of thi= s email thread were talking about

> multiple indicators in the stack; for multip= le set of ancillary data

> after the BoS, either the extended ACH or th= e proposed MPLS/generic

> extension headers or a merge of those propos= als should be able to

> handle it. This is alluded to the DataAfterB= OS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:= 46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <z= zhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of c= ontent]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but = it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to= sort out around the GAL/ACH pair,

> and I was worried about a set of other indic= ators and the data that

> they might want to put "after the BoS&q= uot;. So far I have seen no real

> effort to address the interference's this mi= ght lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zha= ohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could p= ut a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;     ACH       &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;            ACH= TLV Header          &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;            =

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;        zero or more ACH TLVs =             &nb= sp;      

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           G-ACh Mes= sage            = ;            &n= bsp;

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     =             &nb= sp;       Figure 2: G-ACh Packet Payload=

>

>  >>

>

>  >> If the GAL does not have S-bi= t set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in t= he above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-oc= tet field has the S-bit set, the

> transit

>

>  >> LSR will think the label stac= k ends there even though that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL = not at the BoS will not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GA= L which does not have the NoS-bit

> set will have other labels after itself. The= BoS-bit will be found

> deeper down stack and the ACH will immediate= ly fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I'= d like to see the DT address

> multiple indicators in the stack and multipl= e sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the = relevant questiuons first, and

> start working on solutions after that.<= /o:p>

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto= :mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 20= 21 5:07 AM

>

>  >> *To:* Stewart Bryant <stew= art.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.o= rg <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >> *[External Email. Be cautious= of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your state= ment that "an old implementation that

>

>  >> received a ToS GAL not at BoS= would at best throw an exception or

>

>  >> worst be unpredictable".=

>

>  >>

>

>  >> Regarding your statement &quo= t;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the= LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly":

>

>  >>

>

>  >>   1. I fully agree = with this statement as a general restriction  2.

>

>  >> Quite a lot of things have to= be done in order to make this

>

>  >>     = restriction work including at least:

>

>  >>

>

>  >>     =   1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     =      BoS must be provided

>

>  >>     =   2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     =      IGP and BGP must be defined

>

>  >>     =   3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     =      process GAL correctly must be provided for differe= nt

> techniques

>

>  >>     =      (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)=

>

>  >>

>

>  >> It is still possible that, af= ter all this work, we shall find out

>

>  >> that the benefits of supporti= ng GAL at ToS but not BoS will be

> only

>

>  >> available in the networks whe= re all the nodes support the new

>

>  >> functionality because presenc= e of non-supporting nodes imposes too

>

>  >> many restrictions on connecti= vity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    =   +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 20= 21 10:36 AM

>

>  >> *To:* Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stew= art.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zte= tx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >>     = On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = <Alexander.Vainshtein@rbbn.com

>

>  >>     = <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = try and investigate how the existing systems will handle GAL

> being

>

>  >>     = not the BoS label.

>

>  >>

>

>  >>     = */[[Sasha]] Great minds think alike! One useful step could be

>

>  >>     = collecting the known actual behavior of popular

> implementations in

>

>  >>     = this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = think?/*

>

>  >>

>

>  >> That is actually a considerab= le amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old im= plementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw an= exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed processi= ng model is to take the context of

> the

>

>  >> PW label or PW+FAT label, dis= cover the GAL and then process the

> GAL

>

>  >> in the context of the PW labe= l.

>

>  >>

>

>  >> When we extended GAL to apply= to LSPs we again had the model that

> the

>

>  >> GAL operated in the context o= f the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up th= e stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that = knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that = does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eith= er in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the recei= ving node is unpredictable, but in

> any

>

>  >> well written implementation s= hould just result in the packet being

>

>  >> dropped and counted as with a= ny other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is O= K to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the LS= P ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly.

>

>  >>

>

>  >> A GAL not at BoS and not at T= oS should not be inspected or

> processed

>

>  >> by any LSR that did not know = what it was doing, and to attempt to

>

>  >> precess it would be a violati= on of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together = with any attachments may contain

>

>  >> information of Ribbon Communi= cations Inc. and its Affiliates that

> is

>

>  >> confidential and/or proprieta= ry for the sole use of the intended

>

>  >> recipient. Any review, disclo= sure, reliance or distribution by

> others

>

>  >> or forwarding without express= permission is strictly prohibited.

> If

>

>  >> you are not the intended reci= pient, please notify the sender

>

>  >> immediately and then delete a= ll copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _____________________________= __________________

>

>  >> mpls mailing list<= /p>

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxd= Ze1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.o= rg%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob= 1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%= 7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b2401= 89c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d= 8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C= 1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F= 6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson   &n= bsp;            = ;        email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

>  > Bronze Dragon Consulting &nb= sp;           phone: +46 = 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _________________________________= ______________

>

>  > mpls mailing list

>

>  > = mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifL= Cb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2= F%3Furl%3Dhttps%253A%252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%25= 2Fmpls%26data%3D04%257C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a2= 4092e29708d931a0e327%257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%= 257C637595389337881384%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQIjoiV2luMzIiLCJBTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DX= QlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%= 3D0

>

>  >

>

> --

>

> Loa Andersson     &= nbsp;           &nbs= p;      email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

> Bronze Dragon Consulting   &n= bsp;         phone: +46 739 81 21 6= 4

>

>

> Notice: This e-mail together with any attach= ments may contain

> information of Ribbon Communications Inc. an= d its Affiliates that is

> confidential and/or proprietary for the sole= use of the intended

> recipient. Any review, disclosure, reliance = or distribution by others

> or forwarding without express permission is = strictly prohibited. If

> you are not the intended recipient, please n= otify the sender

> immediately and then delete all copies, incl= uding any attachments.

 

--

 

Loa Andersson      =              &n= bsp;    email: loa@pi.nu<= o:p>

Senior MPLS Expert     &= nbsp;           &nbs= p;        loa.pi.nu@gmail.com

Bronze Dragon Consulting    &= nbsp;        phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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Mon, 21 Jun 2021 18:56:02 +0000 From: John E Drake To: Alexander Vainshtein CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Loa Andersson Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rmz8bFcB45u0+GX6eUo5f23asX0EoAgAAZVICAAFZpgIAACH8AgAAEQgCAACAGgIAFz3SAgAAEUoCAAAW7AIAACtKAgAAeZRCAADL8gIAANI6A Date: Mon, 21 Jun 2021 18:56:02 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-21T18:56:00Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; 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Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein Sent: Monday, June 21, 2021 11:46 AM To: John E Drake Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and 5, an = egress LSR that signals both ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]. [JD] If that's the behavior that we want, then RFC 8662 is not deployable. All that is needed is to clarify the (rather, self-evident) rules for SIDs = for which the originating routers effectively signal Implicit Null (expli= citly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared in= IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the BGP= -LU route. I do not think that I have missed anything (Binding SIDs are not involved i= n PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= = and not anywhere else. Stewart has responded that "an old implementation t= hat received a ToS GAL not at BoS would at best throw an exception or worst= be unpredictable". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cannot detect presence of GAL at BoS due to th= e depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measure= ment. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/3R52RdsrwRGTaBhuR= 2Sd5Qw6H2?u=3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2Fclicktime.sy= mantec.com*2F353Ka7ifLCb9e7KAzjZ4fsf6H2*3Fu*3Dhttps*2A3A*2A252__*3BJSU*21*2= 1NEt6yMaO-gk*21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMG_cy= bmA*24__;JSUlJSUlJSUlJSUlJSUlJSU!!NEt6yMaO-gk!Uk8p6mR2CzJJFXxJuweTWC-0CDe7o= dXjIzcOP6yLGVqs-46um02ro1mH2RXrzIw$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB80813036D6A3E378D9CA2297C70A9BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vain= shtein@rbbn.com>
Sent: Monday, June 21, 2021 11:46 AM
To: John E Drake <jdrake@juniper.net>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson= <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

“Great minds thi= nk alike”.

 

Regarding your aside c= omment on RFC 8662:

The last para of Section 4.3 of RFC 6790 says:

 

   As stated in Sections 4.1 and 5, an egress LSR that signal=
s both ELC
 &n=
bsp; and implicit null MUST pop the ELI and the next label (which shou=
ld
&nb=
sp;  be the EL), if it encounters a packet with the ELI as the topmost=

&nb=
sp;  label.  Any other LSR (including PHP LSRs) MUST drop such pa=
ckets, as
   per Section 3.18 of [RFC3031].
 
[JD]  If that’s the behavior that we want, then RFC =
8662 is not deployable.

 

All that is needed is = to clarify the (rather, self-evident) rules for SIDs for which the originat= ing routers  effectively signal Implicit Null  (explicitly or imp= licitly), including:

  1. All Adj-SIDs
  2. All EPE SIDs
  3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared in IS-IS= , NP-flag cleared in OSPF)
  4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of  the BGP-= LU route.

 

I do not think that I = have missed anything (Binding SIDs are not involved in PHP).

 

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Monday, June 21, 2021 3:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is pr= oposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transit= LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label= stack, either when it understands the label pair or when it doesn't.<= /o:p>

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include = adding a copy of the GAL higher up in the stack to make sure that it is wit= hin readable depth for any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is= exposed as ToS but not BoS to an existing standards-compliant MPLS forward= er, it will not know how to handle it since such handling has not ever been= defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique th= at would guarantee that packets with GAL in the middle of the stack only pa= ss thru new LSRs that know how to handle them .

 

However, it is quite possible to do the following= IMHO:

  1. Retain the existi= ng definitions of GAL just at BoS and ACH that immediately follows the BoS<= o:p>
  2. De= fine new ACH types that can carry new ancillary data, and the structures th= at can be used for this purpose (as you have said, “we can carry ever= ything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications to process= such structures in ACH, but at least this would not affect MPLS forwarding= ).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recognize ne= w ACH types to meddle with the information carried in the ACH while forward= ing labeled packets in the usual way
  4. Also allow usage of TTL to help LERs tha= t recognize new ACH types to meddle with the information carried in the ACH= (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough= for the specific set of applications. But it looks to me as reasonably saf= e since it does not require any new forwarding functionality in existing LE= Rs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:<= o:p>

> Loa and all,

>

> I fully agree with the proposal "to not= tamper with ACH anymore".

>

>  From my POV, this includes (by implica= tion) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR?=

>

> As for the question " If the slot immed= iately after the label stack is

> reserved for the ACH does this mean the no o= ther ancillary data may be

> inserted in this position, e.g. MPLS EH's, g= iven that there is a GAL

> in the stack" the answer, IMHO, is YES.=

>

> However, it is quite possible to carry any k= ind of new information in

> the ACH, similar to the way this has been do= ne in Section 3 of RFC

> 8169

> <https:/= /clicktime.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatr= acker.ietf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything= in the associated channel. However there can only one ACH per packet, righ= t?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549= 266302

>

> Email:   Alexander.Vainshtein@= rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:<= /o:p>

>

>  > My opinion is to not tamper with = ACH anymore because it's designed

> for control channel only and so far for a sp= ecial scenario. The

> constraints on GAL and format of ACH are har= d to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible = to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appear= s immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label stac= k is reserved for the ACH

> does this mean the no other ancillary data m= aybe inserted in this

> position, e.g. MPLS EH's, given that there i= s a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpls-b= ounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:0= 2 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexa= nder

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT ad= dress multiple indicators in the

> stack and multiple sets of ancillary data af= ter the BoS.

>

>  >

>

>  > I think the earlier emails of thi= s email thread were talking about

> multiple indicators in the stack; for multip= le set of ancillary data

> after the BoS, either the extended ACH or th= e proposed MPLS/generic

> extension headers or a merge of those propos= als should be able to

> handle it. This is alluded to the DataAfterB= OS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:= 46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <z= zhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of c= ontent]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but = it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to= sort out around the GAL/ACH pair,

> and I was worried about a set of other indic= ators and the data that

> they might want to put "after the BoS&q= uot;. So far I have seen no real

> effort to address the interference's this mi= ght lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zha= ohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could p= ut a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;     ACH       &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;            ACH= TLV Header          &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;            =

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;        zero or more ACH TLVs =             &nb= sp;      

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           G-ACh Mes= sage            = ;            &n= bsp;

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     =             &nb= sp;       Figure 2: G-ACh Packet Payload=

>

>  >>

>

>  >> If the GAL does not have S-bi= t set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in t= he above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-oc= tet field has the S-bit set, the

> transit

>

>  >> LSR will think the label stac= k ends there even though that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL = not at the BoS will not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GA= L which does not have the NoS-bit

> set will have other labels after itself. The= BoS-bit will be found

> deeper down stack and the ACH will immediate= ly fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I'= d like to see the DT address

> multiple indicators in the stack and multipl= e sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the = relevant questiuons first, and

> start working on solutions after that.<= /o:p>

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto= :mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 20= 21 5:07 AM

>

>  >> *To:* Stewart Bryant <stew= art.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.o= rg <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >> *[External Email. Be cautious= of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your state= ment that "an old implementation that

>

>  >> received a ToS GAL not at BoS= would at best throw an exception or

>

>  >> worst be unpredictable".=

>

>  >>

>

>  >> Regarding your statement &quo= t;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the= LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly":

>

>  >>

>

>  >>   1. I fully agree = with this statement as a general restriction  2.

>

>  >> Quite a lot of things have to= be done in order to make this

>

>  >>     = restriction work including at least:

>

>  >>

>

>  >>     =   1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     =      BoS must be provided

>

>  >>     =   2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     =      IGP and BGP must be defined

>

>  >>     =   3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     =      process GAL correctly must be provided for differe= nt

> techniques

>

>  >>     =      (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)=

>

>  >>

>

>  >> It is still possible that, af= ter all this work, we shall find out

>

>  >> that the benefits of supporti= ng GAL at ToS but not BoS will be

> only

>

>  >> available in the networks whe= re all the nodes support the new

>

>  >> functionality because presenc= e of non-supporting nodes imposes too

>

>  >> many restrictions on connecti= vity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    =   +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 20= 21 10:36 AM

>

>  >> *To:* Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stew= art.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zte= tx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >>     = On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = <Alexander.Vainshtein@rbbn.com

>

>  >>     = <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = try and investigate how the existing systems will handle GAL

> being

>

>  >>     = not the BoS label.

>

>  >>

>

>  >>     = */[[Sasha]] Great minds think alike! One useful step could be

>

>  >>     = collecting the known actual behavior of popular

> implementations in

>

>  >>     = this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = think?/*

>

>  >>

>

>  >> That is actually a considerab= le amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old im= plementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw an= exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed processi= ng model is to take the context of

> the

>

>  >> PW label or PW+FAT label, dis= cover the GAL and then process the

> GAL

>

>  >> in the context of the PW labe= l.

>

>  >>

>

>  >> When we extended GAL to apply= to LSPs we again had the model that

> the

>

>  >> GAL operated in the context o= f the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up th= e stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that = knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that = does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eith= er in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the recei= ving node is unpredictable, but in

> any

>

>  >> well written implementation s= hould just result in the packet being

>

>  >> dropped and counted as with a= ny other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is O= K to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the LS= P ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly.

>

>  >>

>

>  >> A GAL not at BoS and not at T= oS should not be inspected or

> processed

>

>  >> by any LSR that did not know = what it was doing, and to attempt to

>

>  >> precess it would be a violati= on of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together = with any attachments may contain

>

>  >> information of Ribbon Communi= cations Inc. and its Affiliates that

> is

>

>  >> confidential and/or proprieta= ry for the sole use of the intended

>

>  >> recipient. Any review, disclo= sure, reliance or distribution by

> others

>

>  >> or forwarding without express= permission is strictly prohibited.

> If

>

>  >> you are not the intended reci= pient, please notify the sender

>

>  >> immediately and then delete a= ll copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _____________________________= __________________

>

>  >> mpls mailing list<= /p>

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxd= Ze1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.o= rg%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob= 1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%= 7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b2401= 89c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d= 8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C= 1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F= 6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson   &n= bsp;            = ;        email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

>  > Bronze Dragon Consulting &nb= sp;           phone: +46 = 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _________________________________= ______________

>

>  > mpls mailing list

>

>  > = mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifL= Cb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2= F%3Furl%3Dhttps%253A%252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%25= 2Fmpls%26data%3D04%257C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a2= 4092e29708d931a0e327%257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%= 257C637595389337881384%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQIjoiV2luMzIiLCJBTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DX= QlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%= 3D0

>

>  >

>

> --

>

> Loa Andersson     &= nbsp;           &nbs= p;      email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

> Bronze Dragon Consulting   &n= bsp;         phone: +46 739 81 21 6= 4

>

>

> Notice: This e-mail together with any attach= ments may contain

> information of Ribbon Communications Inc. an= d its Affiliates that is

> confidential and/or proprietary for the sole= use of the intended

> recipient. Any review, disclosure, reliance = or distribution by others

> or forwarding without express permission is = strictly prohibited. If

> you are not the intended recipient, please n= otify the sender

> immediately and then delete all copies, incl= uding any attachments.

 

--

 

Loa Andersson      =              &n= bsp;    email: loa@pi.nu<= o:p>

Senior MPLS Expert     &= nbsp;           &nbs= p;        loa.pi.nu@gmail.com

Bronze Dragon Consulting    &= nbsp;        phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

--_000_BY3PR05MB80813036D6A3E378D9CA2297C70A9BY3PR05MB8081namp_-- From nobody Mon Jun 21 12:25:37 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 212813A16C2 for ; Mon, 21 Jun 2021 12:25:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.004 X-Spam-Level: X-Spam-Status: No, score=0.004 tagged_above=-999 required=5 tests=[SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id im4IY-dAGvwF for ; Mon, 21 Jun 2021 12:25:29 -0700 (PDT) Received: from mxus.zteusa.com (mxus.zteusa.com [4.14.134.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 88B8A3A16C0 for ; Mon, 21 Jun 2021 12:25:28 -0700 (PDT) Received: from mse-us.zte.com.cn (unknown [10.36.11.29]) by Forcepoint Email with ESMTPS id ECB9A3C096E581C2182C; Tue, 22 Jun 2021 03:25:27 +0800 (CST) Received: from mgapp01.zte.com.cn ([10.36.9.142]) by mse-us.zte.com.cn with SMTP id 15LJPMP9075208; Tue, 22 Jun 2021 03:25:22 +0800 (GMT-8) (envelope-from gregory.mirsky@ztetx.com) Received: from mapi (mgapp02[null]) by mapi (Zmail) with MAPI id mid81; Tue, 22 Jun 2021 03:25:22 +0800 (CST) Date: Tue, 22 Jun 2021 03:25:22 +0800 (CST) X-Zmail-TransId: 2afa60d0e7a2faa3287f X-Mailer: Zmail v1.0 Message-ID: <202106220325220644476@zte.com.cn> In-Reply-To: References: c7d696de-4d83-6e3b-7d10-dc787fdabc73@pi.nu, MW4PR03MB639576D1C4B872AA0F5A8553F6309@MW4PR03MB6395.namprd03.prod.outlook.com, 202106170323552620410@zte.com.cn, MW4PR03MB6395DE6E57E7CBF041ABE8E2F60E9@MW4PR03MB6395.namprd03.prod.outlook.com, E512176A-02D5-4F74-8644-EAC4E3938AEF@gmail.com, MW4PR03MB6395DA0A79E5882ECAC2B7E4F60E9@MW4PR03MB6395.namprd03.prod.outlook.com, BL0PR05MB5652F9023D07DA3FC8479DDCD40E9@BL0PR05MB5652.namprd05.prod.outlook.com, ed6341bc-5508-5fb6-f5c2-e55154c22f2e@pi.nu, BL0PR05MB5652596A808CD766C250F369D40E9@BL0PR05MB5652.namprd05.prod.outlook.com, DM6PR13MB2762515FA53CC3403C2DCA44B60E9@DM6PR13MB2762.namprd13.prod.outlook.com, 9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu, MW4PR03MB6395BF21A477029E8C3C68BDF60A9@MW4PR03MB6395.namprd03.prod.outlook.com, 32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu, MW4PR03MB639525BB442881B0B8F922B4F60A9@MW4PR03MB6395.namprd03.prod.outlook.com Mime-Version: 1.0 From: To: Cc: , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-us.zte.com.cn 15LJPMP9075208 Archived-At: Subject: Re: [mpls] =?utf-8?q?=5BEXTERNAL=5D_Indicators_in_the_stack_and_anci?= =?utf-8?q?llary_data_after_the_BoS?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Jun 2021 19:25:35 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Sasha, great discussion, thank you! Please find my notes below in-line tagged by GIM>>. Best regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn ------------------Original Mail------------------ Sender: AlexanderVainshtein To: Loa Andersson; CC: mpls@ietf.org;Haoyu Song;Jeffrey (Zhaohui) Zhang; Date: 2021/06/21 03:56 Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS _______________________________________________ mpls mailing list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls Loa, Regarding your question “Would you include adding a copy of the GAL higher up in the stack to make sure that it is within readable depth for any LSR?” my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not BoS to an existing standards-compliant MPLS forwarder, GIM>> I would not refer to existing implementation that supports GAL only as BoS being standards-complaint. I believe that earlier, we've established that the requirement in RFC 5586 "GAL MUST be BoS" applies only and only to an MPLS-TP environment. RFC 55886 and all standards up to date are underspecified for other scenarios. I understand that developers used their best judgment by implementing GAL as strictly BoS, but that doesn't have any foundation in current RFCs. We seem to agree on this characterization of the state of the use of GAL in a non-MPLS-TP environment. Hence, the next step could be closing the gap in the GAL specification. It appears there are two possible paths: - have a short document extending GAL is only BoS to all MPLS environments; - allow GAL as ToS while != BoS. In either case, GAL indicates that a single ACH immediately follows the BoS. it will not know how to handle it since such handling has not ever been defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an old implementation that received a ToS GAL not at BoS would at best throw an exception or worst be unpredictable”. Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that packets with GAL in the middle of the stack only pass thru new LSRs that know how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immediately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the structures that can be used for this purpose (as you have said, “we can carry everything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications to process such structures in ACH, but at least this would not affect MPLS forwarding). GIM>> That, to me, is a logical conclusion of #1. I might propose to allocate a new, different from GAL, SPL to signal that the "new ACH immediately follows the BoS". And we might avoid terminology confusion in the future if the new ACH is named differently, e.g., "MPLS Extension Header (MEH)". 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recognize new ACH types to meddle with the information carried in the ACH while forwarding labeled packets in the usual way GIM>> If we use a new SPL (why not call it MEHI), we can allow MEHI to be not BoS, and thus an LSR can react to its presence in the stack. Consequently, MEHI can appear in the stack more than once. 4. Also allow usage of TTL to help LERs that recognize new ACH types to meddle with the information carried in the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the depth of the stack. I cannot say whether this approach is good enough for the specific set of applications. But it looks to me as reasonably safe since it does not require any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhang ; Stewart Bryant Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make sure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel. However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song ; Jeffrey (Zhaohui) Zhang > ; Alexander Vainshtein > ; Stewart Bryant > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls > > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >; Alexander > Vainshtein > > > >; Stewart Bryant > > > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson > > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > > > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls > > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwarding. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=https%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=https%3A%2 > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information of Ribbon Communications Inc. and its Affiliates that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments. --=====_003_next=====-- --=====_001_next=====-- From nobody Mon Jun 21 18:51:33 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D31753A09C7; Mon, 21 Jun 2021 18:51:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EmLEbOQbgRWA; Mon, 21 Jun 2021 18:51:27 -0700 (PDT) Received: from mxus.zteusa.com (mxus.zteusa.com [4.14.134.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C29AC3A09FD; Mon, 21 Jun 2021 18:51:26 -0700 (PDT) Received: from mse-us.zte.com.cn (unknown [10.36.11.29]) by Forcepoint Email with ESMTPS id 21F9AD399F9B0C2D8BBC; Tue, 22 Jun 2021 09:51:25 +0800 (CST) Received: from mgapp02.zte.com.cn ([10.36.9.143]) by mse-us.zte.com.cn with SMTP id 15M1pKQk026038; Tue, 22 Jun 2021 09:51:20 +0800 (GMT-8) (envelope-from gregory.mirsky@ztetx.com) Received: from mapi (mgapp01[null]) by mapi (Zmail) with MAPI id mid81; Tue, 22 Jun 2021 09:51:19 +0800 (CST) Date: Tue, 22 Jun 2021 09:51:19 +0800 (CST) X-Zmail-TransId: 2af960d1421766543f28 X-Mailer: Zmail v1.0 Message-ID: <202106220951199465042@zte.com.cn> In-Reply-To: References: 202106140819542507138@zte.com.cn, BN6PR05MB3569A9553DD5E449ED5B203AD5309@BN6PR05MB3569.namprd05.prod.outlook.com Mime-Version: 1.0 From: To: Cc: , , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-us.zte.com.cn 15M1pKQk026038 Archived-At: Subject: Re: [mpls] =?utf-8?q?I-D_Action=3A_draft-ninan-mpls-spring-inter-dom?= =?utf-8?q?ain-oam-03=2Etxt?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 01:51:32 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Shraddha, thank you for helping me with detailed clarifications. (Apologies for using plain text mode but we've noticed a problem our mailer exposes in the mailarchive). Please find my follow-up notes in-lined under GIM>> tag. Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn ------------------Original Mail------------------ Sender: ShraddhaHegde To: gregory mirsky10211915; CC: mpls@ietf.org;i-d-announce@ietf.org ;mach.chen@huawei.com;adrian@olddog.co.uk;huubatwork@gmail.com; Date: 2021/06/14 22:25 Subject: RE: Re:[mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);}" _ue_custom_node_="true"> Hi Greg, Thank you for the follow-up. Pls see inline for replies. -----Original Message----- From: gregory.mirsky@ztetx.com Sent: Monday, June 14, 2021 5:50 AM To: Shraddha Hegde Cc: mpls@ietf.org; i-d-announce@ietf.org; mach.chen@huawei.com; adrian@olddog.co.uk; huubatwork@gmail.com Subject: Re:[mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt [External Email. Be cautious of content] Hi Shraddha and Authors, thank you for updating the draft. I've reviewed the new version and couldn't find most of my comments addressed. Could you kindly help by pointing to the specific changes in the draft that, in your opinion, address my comments @ https://urldefense.com/v3/__https://mailarchive.ietf.org/arch/msg/mpls/wmd0wbToaCEtDhgd2gFcX2HzG90/__;!!NEt6yMaO-gk!Rw6JdmD9WO__g0GzLwDiRtgamBQBekpwXb-QKJzwwfZB14cHNoFoYk7utpZBQaKX$ ? Comment: I couldn't find a sufficient technical explanation for introducing a new mechanism for the inter-domain ping/traceroute in addition to the one described Addressed in section: 1 Introduction Diff: GIM>> I see that the new text again characterizes RFC 7743 as requiring that an ASBR passes an echo reply to the control plane. Firstly, taking a packet out of the fast path processing does not automatically mean that it is punted to the control plane (what is the control plane of a networking system?). Also, the new text suggests that the mechanism described in the draft "simplifies operations to a greater extent in SR networks". It is not clear how that is achieved. Is that the result of transporting an echo reply over the MPLS data plane rather than, as defined in RFC 7743, IP network? If that is what you see as the advantage, could you please expand on why and in which case transporting the echo reply through MPLS simplifies operations in a multi-domain SR network? Comment: Three types of SID sub-TLVs are defined, but only use of one is mentioned in the document. Addressed in section: 8 Diff: Comment: I couldn't find an explanation of the relationship between IPv4/IPv6 Node Address and SID in Type 3 and Type 4 sub-TLVs, respectively  Also, in which scenario the SID field in Type 3 and Type 4 sub-TLVs is recommended? Addressed in section: I would recommend reading sections 6, 7 and 8 to get the complete description of how Type 3 and type 4 can be used. Diff: GIM>> The new text suggests that a local policy controls whether an ASBR cooperates with the described traceroute mode. I can assume that the policy would, for security reasons, prevent ASBR from participating. I couldn't find an explanation in the draft of what happens in that case. Comment: And further, traceroute mode is called out of the scope of RFC 7743. I've read the explanation of traceroute in the draft, and I don't think it is a work Addressed in section: section 7.2 Diff: As I've noted, I am not sure what is referred to as "the control plane" in the draft in describing the solution defined in RFC 7743. RFC 7743 itself does not, as I understand it, require that an Echo Reply is sent to the control plane at any step. RFC 7743 describes how to relay the echo-reply in section 4.4. The relaying node receives the echo-reply packet with destination set to relay node. Then the relaying node need To examine the "Relay Node Address stack TLV" to find the next relay node or the initiator and send either relayed- Echo-reply or a normal echo-reply based on whether there are further relay nodes to be visited. My understanding is that this complex operation of finding the next relay node from the packet and replacing That into the destination address of the packet would require packet to be sent to control plane and cannot be done in forwarding plane. GIM>> I think that when some processing is done outside of the fast path that is not necessarily means that that function must be completed in the control plane (which is still not clear what the "control plane" means in the context of this draft). I can imagine that that extra processing is done as bump-in-a-wire as the rate of echo replies is controlled. Also relay node receives the packet with destination address set to the relay node. The normal behaviour of a router for self addressed packets is to send the packet to control plane, the draft does not talk about GIM>> Though that might be the case, implementations are using special cases to optimize some scenarios. Any forwarding plane behaviour change with respect to self destined packets. If you have an implementation that does that, perhaps we can look at whether that is indeed the property of the solution or is implementation-specific. I would like to understand if you have an implementation where the relayed echo-reply processing on the relay node is done in forwarding plane. The RFC does not specify explicitly that relay node processing is to be done in forwarding plane also does not Provide enough details that would be needed to process the "relay node address stack TLV" in forwarding plane. Also, I'm still concern with the specification for traceroute mode in the draft. I have a couple of additional notes to add: - RFC 7110, as well as RFC 7743 (I've pointed that out in my first comments), has traceroute outside the scope; This draft has addressed traceroute and provided enough details on how traceroute procedure Works. Let me know if you have specific questions on traceroute procedure. GIM>> As I've noted earlier, it is not clear how ASBR responds if the local policy prohibits it from participating in the described traceroute mode. Do you have a concern with this draft addressing traceroute? As long as this draft provides a workable Solution it should not matter whether previous RFCs in the area addressed traceroute or not! - RFC 8029 (Section 4.3) recommends using the Downstream Detailed Mapping TLV. I couldn't find that TLV being mentioned in the draft. If you believe that TLV must not be used, could you list reasons for not using the Downstream Detailed Mapping TLV? Downstream Detailed Mapping TLV is very much used. Section 6.2 specifies no changes to RFC 8029/RFC 8287 procedures. The change is only in processing additional reply path TLV when it comes in echo-request And also in adding this Return path TLV while sending echo-reply. " The responder MUST follow the normal FEC validation procedures as described in [RFC8029] and [RFC8287] and this document does not suggest any change to those procedures." If it is not clear enough, I can update the text as below " The responder MUST follow the normal FEC validation procedures and echo-reply building procedures as described in [RFC8029] and [RFC8287] and this document does not suggest any change to those procedures." Let me know if that works for you. GIM>> I think that the new text requires thorough analysis of how the Downstream Detailed Mapping TLV is handled by the remote domain. You would agree that exposing the inner topology to an external system poses a severe security risk. Regards, Greg Mirsky Sr. Standardization Expert 预研标准部/有线研究院/有线产品经营部 Standard Preresearch Dept./Wireline Product R&D Institute/Wireline Product Operation Division E: gregory.mirsky@ztetx.com www.zte.com.cn ------------------Original Mail------------------ Sender: ShraddhaHegde To: mpls@ietf.org;i-d-announce@ietf.org ;Mach Chen;gregory mirsky10211915;adrian@olddog.co.uk;huubatwork@gmail.com; Date: 2021/06/11 01:34 Subject: RE: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt Hi All, New version of draft-ninan-mpls-spring-inter-domain-oam is posted addressing comments from MPLS-RT review. Pls take a look and let me know if you have further comments. Rgds Shraddha Juniper Business Use Only -----Original Message----- From: mpls On Behalf Of internet-drafts@ietf.org Sent: Friday, June 11, 2021 2:00 PM To: i-d-announce@ietf.org Cc: mpls@ietf.org Subject: [mpls] I-D Action: draft-ninan-mpls-spring-inter-domain-oam-03.txt [External Email. Be cautious of content] A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiprotocol Label Switching WG of the IETF. Title : PMS/Head-end based MPLS Ping and Traceroute in Inter-domain SR Networks Authors : Shraddha Hegde Kapil Arora Mukul Srivastava Samson Ninan Nagendra Kumar Filename : draft-ninan-mpls-spring-inter-domain-oam-03.txt Pages : 21 Date : 2021-06-11 Abstract: Segment Routing (SR) architecture leverages source routing and tunneling paradigms and can be directly applied to the use of a Multiprotocol Label Switching (MPLS) data plane. A network may consist of multiple IGP domains or multiple ASes under the control of same organization. It is useful to have the LSP Ping and traceroute procedures when an SR end-to-end path spans across multiple ASes or domains. This document describes mechanisms to facilitae LSP ping and traceroute in inter-AS/inter-domain SR networks in an efficient manner with simple OAM protocol extension which uses dataplane forwarding alone for sending echo reply. The IETF datatracker status page for this draft is: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ninan-mpls-spring-inter-domain-oam/__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5TuJNnI5%7B0%7Dlt;br> There is also an htmlized version available at: https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ninan-mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5VMFXpJm%7B0%7Dlt;br> A diff from the previous version is available at: https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=draft-ninan-mpls-spring-inter-domain-oam-03__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5QEnIeV0%7B0%7Dlt;br> Internet-Drafts are also available by anonymous FTP at: https://urldefense.com/v3/__ftp://ftp.ietf.org/internet-drafts/__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5T0hqLuk%7B0%7Dlt;br> _______________________________________________ mpls mailing list mpls@ietf.org https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/mpls__;!!NEt6yMaO-gk!WjDBRkDAvnDKCC6tb3iz7_nNl8kTHr2mV0bTh80i0AzKeABzFQV3dfGS5TdmWWCx%7B0%7Dlt;br> Juniper Business Use Only --=====_003_next=====-- --=====_001_next=====-- From nobody Tue Jun 22 01:22:42 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 671433A1B69 for ; 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Tue, 22 Jun 2021 10:22:30 +0200 (CEST) From: To: John E Drake CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Loa Andersson Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZremsXfIZcCGlEegrN7TXPgbtqseyI0AgADhWTA= Date: Tue, 22 Jun 2021 08:22:29 +0000 Message-ID: <11939_1624350151_60D19DC7_11939_144_7_53C29892C857584299CBF5D05346208A4CDF3EE4@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> <22670_1624291680_60D0B960_22670_356_5_53C29892C857584299CBF5D05346208A4CDF2F2B@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A4CDF3EE4OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 08:22:41 -0000 --_000_53C29892C857584299CBF5D05346208A4CDF3EE4OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Please see inline [Bruno] From: John E Drake [mailto:jdrake@juniper.net] Sent: Monday, June 21, 2021 8:41 PM To: DECRAENE Bruno INNOV/NET ; Alexander Vainsht= ein ; Loa Andersson Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g Subject: RE: [mpls] Indicators in the stack and ancillary data after the BoS Hi, I'm familiar with the references, comments inline. [Bruno] I'm pretty sure you are. I'm only providing the reference as the so= urce i.e. reference for anyone to check. Yours Irrespectively, John Juniper Business Use Only From: bruno.decraene@orange.com > Sent: Monday, June 21, 2021 12:08 PM To: John E Drake >; Alexander= Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] Indicators in the stack and ancillary data after the BoS [External Email. Be cautious of content] > As an aside, RFC 8662 does not define what a transit LSR should do when i= t finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. I believe it does: - if it does not understand ELI (i.e. does not support RFC 8662) it drops t= he packet as per Section 3.18 of [RFC3031]. [JD] This section does not define the behavior of a transit LSR that recei= ves a reserved label at the top of the MPLS label stack. [Bruno] - this section does not say that reserved label are to be treated different= ly - RFC 8662 builds on it and nobody complained at the time Now if you are saying that in the MPLS architecture the forwarding of unkno= wn reserved label is not defined, I leave this to the WG. That would be a 2= 0 years old issue. - if it understands ELI (i.e. supports RFC 8662), it processes the EL, ELI = pair as defined in https://datatracker.ietf.org/doc/html/rfc6790#section-4.= 1 (The 2nd paragraph explicitly covers the case where th= e top label is the ELI). (Note that in this case, since the ELI is the top = label that LSR is actually an LER with PHP enabled) [JD] This section defines the behavior of an egress LSR that receives an [= ELI, EL] pair. It does not define the behavior of a transit LSR that recei= ves an [ELI, EL] at the top of the MPLS label stack. [Bruno] My reading of https://datatracker.ietf.org/doc/html/rfc3031#section= -3.15 is that in your scenario (ELI on top while the node is not an LER) th= e node is not forwarding along an LSP. As such I would not called it a tran= sit LSR of an LSP. In all cases, if PHP is enabled, the LSR does not know whether it was suppo= sed to the LER of that LSP. All it sees is the ELI, EL and RFC 6790 tells i= t to process the ELI, EL including when the ELI is on not. But why are we having this conversation? [JD] At the very least, RFC 8662 should have defined which transit LSR, the= LSR popping the SID above the [ELI, EL] pair or the LSR receiving it shoul= d remove it and stipulating that once that behavior is defined, ensuring th= at the subject transit router must understand entropy labels. RFC 8662 does not change data plane processing of the Entropy Label on tran= sit or egress LSR. To answer your question, the ELI, EL is removed by the "LSR receiving" the = [ELI, EL pair]. There is no changed compared to LDP (and in both cases, PHP= may be enabled or not; LSP may be stacked on not). BTW that node is an egr= ess LSR, not a transit LSR. My bigger point is that we are defining all sorts of nifty new functions wh= ile ignoring incremental deployment. If we edict that every LSR needs to u= nderstand every nifty new function before those functions may be deployed, = then we are ensuring that those nifty new functions will never be deployed. [Bruno] Thanks for the clarification. I'm fine with your bigger point and I support it. I'm all for incremental deployment. I'm even in favor of incremental deploy= ment with incremental benefit in order to get early incentive for deploying= the new feature. Regards, --Bruno From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of John E Drake Sent: Monday, June 21, 2021 2:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart has responded that "an old implementat= ion that received a ToS GAL not at BoS would at best throw an exception or = worst be unpredictable". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cannot detect presence of GAL at BoS due = to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/353Ka7ifLCb9e7KAz= jZ4fsf6H2?u=3Dhttps*3A*252__;JSU!!NEt6yMaO-gk!QiStnftbs7rzJ6JZRtxhV6LZks_wN= vQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A4CDF3EE4OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Ple= ase see inline [Bru= no]

 

From:<= span lang=3D"EN-US" style=3D"mso-fareast-font-family:"Times New Roman&= quot;;mso-ansi-language:EN-US"> John E Drake [mailto:jdrake@juniper.net]
Sent: Monday, June 21, 2021 8:41 PM
To: DECRAENE Bruno INNOV/NET <bruno.decraene@orange.com>; Alex= ander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <= loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song <hson= g@futurewei.com>; Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Subject: RE: [mpls] Indicators in the = stack and ancillary data after the BoS

 

Hi,

 

I’m familiar with the references, comments inline.

[Bruno] I’m pretty sure you are. I’m only providing the reference as the source i.e. reference for anyone to check.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: bruno.decraene@orange.com = <bruno.decraene@orange.com<= /a>>
Sent: Monday, June 21, 2021 12:08 PM
To: John E Drake <jdrake@ju= niper.net>; Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <= loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang@junipe= r.net>
Subject: RE: [mpls] Indicators in the stack and ancillary data after= the BoS

 

<= span style=3D"font-size:10.5pt;font-family:Lato;color:black">[External Emai= l. Be cautious of content]

 

> As an aside, = RFC 8662 does not define what a transit LSR should do when it finds an [ELI= , EL] pair at the top of the MPLS label stack, either when it understands t= he label pair or when it doesn't.

 

I believe it d= oes:

- if it does not understand ELI (i.e=
. does not support RFC 8662) it drops the packet as per Section 3.18 of [RFC3031]<=
/span>.
 
[JD]  Th=
is section does not define the behavior of a transit LSR that receives a re=
served label at the top of the MPLS label stack. =

[Bruno] <=
o:p>
- this se=
ction does not say that reserved label are to be treated differently=

- RFC 866=
2 builds on it and nobody complained at the time
Now if yo=
u are saying that in the MPLS architecture the forwarding of unknown reserv=
ed label is not defined, I leave this to the WG. That would be a 20 years o=
ld issue.
 
 

- if it unders= tands ELI (i.e. supports RFC 8662), it processes the EL, ELI pair as define= d in https://datatracker.ietf.org/doc/html/rfc6790#section-4.1 (The 2nd= paragraph explicitly covers the case where the top label is the ELI)= . (Note that in this case, since the ELI is the top label that LSR is actua= lly an LER with PHP enabled)

 

[JD]  This section defines the behavior of an egress LSR that= receives an [ELI, EL] pair.  It does not define the behavior of a tra= nsit LSR that receives an [ELI, EL] at the top of the MPLS label stack.  

[Bruno] M=
y reading of https://datatracker.ietf.org/doc/html/rfc3031#section-3.15 is =
that in your scenario (ELI on top while the node is not an LER) the node is=
 not forwarding along an LSP. As such I would not called it a transit LSR o=
f an LSP.
In all ca=
ses, if PHP is enabled, the LSR does not know whether it was supposed to th=
e LER of that LSP. All it sees is the ELI, EL and RFC 6790 tells it to proc=
ess the ELI, EL including when the ELI is on not.
&nbs=
p;
But why a=
re we having this conversation?
&nbs=
p;
&nbs=
p;

[JD] At the very least, RFC 8662 should have defined which tr= ansit LSR, the LSR popping the SID above the [ELI, EL] pair or the LSR rece= iving it should remove it and stipulating that once that behavior is defined, ensuring that the subject transit router mu= st understand entropy labels.

RFC 8662 =
does not change data plane processing of the Entropy Label on transit or eg=
ress LSR.
To answer=
 your question, the ELI, EL is removed by the “LSR receiving” t=
he [ELI, EL pair]. There is no changed compared to LDP (and in both cases, =
PHP may be enabled or not; LSP may be stacked on not). BTW that node is an =
egress LSR, not a transit LSR.
&nbs=
p;

&nb= sp;

 

My bigger point is that we are defining all sorts of nifty new fun= ctions while ignoring incremental deployment.  If we edict that every = LSR needs to understand every nifty new function before those functions may be deployed, then we are ensuring that those ni= fty new functions will never be deployed.   

[Bruno] T=
hanks for the clarification.
I’m=
 fine with your bigger point and I support it.
I’m=
 all for incremental deployment. I’m even in favor of incremental dep=
loyment with incremental benefit in order to get early incentive for deploy=
ing the new feature.

 

 

Regards,<= /o:p>

--Bruno

 

 

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of John E Drake
Sent: Monday, June 21, 2021 2:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is proposing what I was p= roposing several months ago.

 

As an aside, RFC 8662 does not define what a transit LSR should do when = it finds an [ELI, EL] pair at the top of the MPLS label stack, either when = it understands the label pair or when it doesn't.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Lato;color:black;= mso-ansi-language:EN-US">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include adding a copy of the= GAL higher up in the stack to make sure that it is within readable depth f= or any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is exposed as ToS but = not BoS to an existing standards-compliant MPLS forwarder, it will not know= how to handle it since such handling has not ever been defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique that would guarantee t= hat packets with GAL in the middle of the stack only pass thru new LSRs tha= t know how to handle them .

 

However, it is quite possible to do the following IMHO:

  1. Retain the existing definitions of GAL just at BoS and ACH t= hat immediately follows the BoS
  2. Define= new ACH types that can carry new ancillary data, and the structures that c= an be used for this purpose (as you have said, “we can carry everything in the associated channel= 221;, including TLVs and Sub-TLVs, if necessary – it will be up to th= e specific applications to process such structures in ACH, but at least thi= s would not affect MPLS forwarding).
  3. A= llow LERs that (a) can detect presence of GAL at BoS and (b) recognize new = ACH types to meddle with the information carried in the ACH while forwarding labeled packets in the usual way<= /o:p>
  4. = Also allow usage of TTL to help LERs that r= ecognize new ACH types to meddle with the information carried in the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough for the specific se= t of applications. But it looks to me as reasonably safe since it does not = require any new forwarding functionality in existing LERs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-549266302

Email:   Alexander.Vainshtein@rbbn.= com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:

> Loa and all,

>

> I fully agree with the proposal "to not tamper with ACH any= more".

>

>  From my POV, this includes (by implication) not tampering = also with

> GAL as well.

 

Would you include adding a copy of the GAL higher up in the stack to = make sure that it is within readable depth for any LSR?

>

> As for the question " If the slot immediately after the lab= el stack is

> reserved for the ACH does this mean the no other ancillary data = may be

> inserted in this position, e.g. MPLS EH's, given that there is a= GAL

> in the stack" the answer, IMHO, is YES.

>

> However, it is quite possible to carry any kind of new informati= on in

> the ACH, similar to the way this has been done in Section 3 of R= FC

> 8169

> <https://clicktime.symant= ec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2F= doc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything in the associated c= hannel. However there can only one ACH per packet, right?=

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549266302

>

> Email:   Alexander.Vainshtein@rbbn.c= om

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: m= pls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancil= lary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:

>

>  > My opinion is to not tamper with ACH anymore because = it's designed

> for control channel only and so far for a special scenario. The

> constraints on GAL and format of ACH are hard to adapt to the ne= w use

> case requirements.

>

>  >

>

> I think this is a position that is possible to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appears immediately after = the bottom

> of the label stack."

>

> If the slot immediately after the label stack is reserved for th= e ACH

> does this mean the no other ancillary data maybe inserted in this

> position, e.g. MPLS EH's, given that there is a GAL in the stack= ?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bou= nces@ietf.org <mailto:mpls-bounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:02 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexander

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] Indicators in the stac= k and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT address multiple indic= ators in the

> stack and multiple sets of ancillary data after the BoS.

>

>  >

>

>  > I think the earlier emails of this email thread were = talking about

> multiple indicators in the stack; for multiple set of ancillary = data

> after the BoS, either the extended ACH or the proposed MPLS/gene= ric

> extension headers or a merge of those proposals should be able to

> handle it. This is alluded to the DataAfterBOS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <= ;loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] Indicators in the stac= k and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of content]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but it is intended to ad= dress the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to sort out around the= GAL/ACH pair,

> and I was worried about a set of other indicators and the data t= hat

> they might want to put "after the BoS". So far I have = seen no real

> effort to address the interference's this might lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could put a GAL not at a Bo= S:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =   ACH           = ;            &n= bsp;     

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;         ACH TLV Header &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =             &nb= sp;             = ;         

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;     zero or more ACH TLVs    &n= bsp;            = ;   

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;            =             &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>      |   =             &nb= sp;            =             &nb= sp;            =          

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;        G-ACh Message  &nbs= p;            &= nbsp;         

> ~

>

>  >>

>

>  >>      ~   =             &nb= sp;            =             &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-&= #43;-+-+-+-+-+-+-+-+-+-+-+-+= ;-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>        &n= bsp;            = ;    Figure 2: G-ACh Packet Payload

>

>  >>

>

>  >> If the GAL does not have S-bit set, wouldn't a tr= ansit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in the above Figure) aft= er that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-octet fiel= d has the S-bit set, the

> transit

>

>  >> LSR will think the label stack ends there even th= ough that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL not at the BoS will = not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GAL which does not hav= e the NoS-bit

> set will have other labels after itself. The BoS-bit will be fou= nd

> deeper down stack and the ACH will immediately fo9llow the BoS.<= o:p>

>

>  >

>

>  > Yes there are issues here, but I'd like to see the DT= address

> multiple indicators in the stack and multiple sets of ancillary = data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the relevant questiuons = first, and

> start working on solutions after that.

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto:mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 2021 5:07 AM

>

>  >> *To:* Stewart Bryant <stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in th= e stack and

>

>  >> ancillary data after the BoS

>

>  >>

>

>  >> *[External Email. Be cautious of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your statement that "an o= ld implementation that

>

>  >> received a ToS GAL not at BoS would at best throw= an exception or

>

>  >> worst be unpredictable".

>

>  >>

>

>  >> Regarding your statement "it is OK to have m= ultiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the LSP ensured that al= l LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths that found the GAL a= t ToS were known

> to

>

>  >> be able to process it correctly":=

>

>  >>

>

>  >>   1. I fully agree with this statement = as a general restriction  2.

>

>  >> Quite a lot of things have to be done in order to= make this

>

>  >>      restriction work in= cluding at least:

>

>  >>

>

>  >>       1. The defini= tion of correct processing of GAL at ToS but

> not at

>

>  >>        &n= bsp; BoS must be provided

>

>  >>       2. Advertisem= ent of ability to process GAL not at BoS

> correctly in

>

>  >>        &n= bsp; IGP and BGP must be defined

>

>  >>       3. Ability to= set up network-wide paths that only cross

> nodes that

>

>  >>        &n= bsp; process GAL correctly must be provided for different

> techniques

>

>  >>        &n= bsp; (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

>

>  >>

>

>  >> It is still possible that, after all this work, w= e shall find out

>

>  >> that the benefits of supporting GAL at ToS but no= t BoS will be

> only

>

>  >> available in the networks where all the nodes sup= port the new

>

>  >> functionality because presence of non-supporting = nodes imposes too

>

>  >> many restrictions on connectivity and/or resilien= ce.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:      +972-5492= 66302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@rbbn.c= om

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <stewart.bryant@gmail.co= m

>

>  >> <mailto:stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 2021 10:36 AM

>

>  >> *To:* Alexander Vainshtein <Alexander.Vainshte= in@rbbn.com

>

>  >> <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stewart.bryant@gmail.com=

>

>  >> <mailto:stewart.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com<= /a>

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in th= e stack and

>

>  >> ancillary data after the BoS

>

>  >>

>

>  >>      On 17 Jun 2021, at = 07:45, Alexander Vainshtein

>

>  >>      <Alexander.Vains= htein@rbbn.com

>

>  >>      <mailto:Alexande= r.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>      While that might be= the case, I think that the Open DT may

> give it a

>

>  >>      try and investigate= how the existing systems will handle GAL

> being

>

>  >>      not the BoS label.<= o:p>

>

>  >>

>

>  >>      */[[Sasha]] Great m= inds think alike! One useful step could be

>

>  >>      collecting the know= n actual behavior of popular

> implementations in

>

>  >>      this case, say, by = running a survey among the vendors - what

> do you

>

>  >>      think?/*=

>

>  >>

>

>  >> That is actually a considerable amount of work th= at will take a while.

>

>  >>

>

>  >> It seems to me that an old implementation that re= ceived a ToS GAL

> not

>

>  >> at BoS would at best throw an exception or worst = be unpredictable.

>

>  >>

>

>  >> The original assumed processing model is to take = the context of

> the

>

>  >> PW label or PW+FAT label, discover the GAL an= d then process the

> GAL

>

>  >> in the context of the PW label.=

>

>  >>

>

>  >> When we extended GAL to apply to LSPs we again ha= d the model that

> the

>

>  >> GAL operated in the context of the LSP label that= preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up the stack is a new beh= aviour.

>

>  >>

>

>  >> If it arrives at an LSR that knows the new semant= ic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that does not know the ne= w semantic then

>

>  >>

>

>  >> a) An error has occurred either in setting up the= LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the receiving node is unpredi= ctable, but in

> any

>

>  >> well written implementation should just result in= the packet being

>

>  >> dropped and counted as with any other Mal-formed = packet.

>

>  >>

>

>  >> So I would think that it is OK to have multiple G= ALs and GALs not

> at

>

>  >> BoS IFF the creator of the LSP ensured that all L= SRs on the LSP,

>

>  >> including ECMP and FRR paths that found the GAL a= t ToS were known

> to

>

>  >> be able to process it correctly.

>

>  >>

>

>  >> A GAL not at BoS and not at ToS should not be ins= pected or

> processed

>

>  >> by any LSR that did not know what it was doing, a= nd to attempt to

>

>  >> precess it would be a violation of the normal MPL= S processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together with any attachments= may contain

>

>  >> information of Ribbon Communications Inc. and its= Affiliates that

> is

>

>  >> confidential and/or proprietary for the sole use = of the intended

>

>  >> recipient. Any review, disclosure, reliance or di= stribution by

> others

>

>  >> or forwarding without express permission is stric= tly prohibited.

> If

>

>  >> you are not the intended recipient, please notify= the sender

>

>  >> immediately and then delete all copies, including= any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _______________________________________________

>

>  >> mpls mailing list

>

>  >> m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >>

> h= ttps://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u= =3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253= A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flisti= nfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbe= BMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%7Chsong%40futurewei.= com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata= =3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&amp;res= erved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson      &nbs= p;            &= nbsp;    email: loa@pi.nu

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com&g= t;

>

>  > Bronze Dragon Consulting     = ;        phone: +46 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _______________________________________________<= /o:p>

>

>  > mpls mailing list

>

>  > m= pls@ietf.org <mailto:mpls@iet= f.org>

>

>  >

> h= ttps://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u= =3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A= %252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%2= 57C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327= %257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C6375953893378813= 84%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ= BTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyP= MiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%3D0

>

>  >

>

> --

>

> Loa Andersson        &nb= sp;            =    email: loa@pi.nu

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com&g= t;

>

> Bronze Dragon Consulting      &nbs= p;      phone: +46 739 81 21 64

>

>

> Notice: This e-mail together with any attachments may contain

> information of Ribbon Communications Inc. and its Affiliates tha= t is

> confidential and/or proprietary for the sole use of the intended

> recipient. Any review, disclosure, reliance or distribution by o= thers

> or forwarding without express permission is strictly prohibited.= If

> you are not the intended recipient, please notify the sender

> immediately and then delete all copies, including any attachment= s.

 

--

 

Loa Andersson          &= nbsp;           &nbs= p; email: loa@pi.nu

Senior MPLS Expert        &nb= sp;            =      loa.pi.nu@gmail.com

Bronze Dragon Consulting       &nb= sp;     phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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--_000_53C29892C857584299CBF5D05346208A4CDF3EE4OPEXCAUBM43corp_-- From nobody Tue Jun 22 01:33:20 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3B3A43A1BC7; Tue, 22 Jun 2021 01:33:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jP36B4739xE2; Tue, 22 Jun 2021 01:33:14 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C314E3A1BC5; Tue, 22 Jun 2021 01:33:13 -0700 (PDT) Received: from opfedar00.francetelecom.fr (unknown [xx.xx.xx.11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by opfedar20.francetelecom.fr (ESMTP service) with ESMTPS id 4G8KRD121Fz8tL9; Tue, 22 Jun 2021 10:33:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1624350792; bh=tzuJ3wMkhneuSMgydOq7kfADTqT8X9+kbZ8ZKtwr3K8=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=ZwlGRBNX7nLF326xu79kKUK4KVjvYfHNiHkip15z0KMaLPXZ2xJNtS+CQtas9Ki9A 9GjVW7A0wid7dxtDBdLzXd7pLcI5BtArwNSKhYIdpmaB8X1ZEbDQiDQu6nUSAz3e5G +/opDtuFAb0DaRvoXCaJrnMuIvU6rfwKa2xFIGxZ8dW0YASxna4v4Vb1to7kYkPj17 ETuKfynA+R3UldvNdOK4s0WvonugwkNl72mxGZo/9Mtti/DmWjXMoRUUALK7Z8q/9H ezCw7Q4142N9+T/dLYJGHKFDc+2qD18rYCRgT349BXF3S2Hc7ux2kEyONxgf8eVcbl SfITcy6P2BvOw== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opfedar00.francetelecom.fr (ESMTP service) with ESMTPS id 4G8KRC5sl7zCqkD; Tue, 22 Jun 2021 10:33:11 +0200 (CEST) From: To: Haoyu Song , "draft-song-mpls-eh-indicator@ietf.org" CC: "mpls@ietf.org" , Loa Andersson , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZnp1KmXm0GDTTUWo1eOKTl9pvqseqjHAgAAA0ZCAAA1wYIAA+maA Date: Tue, 22 Jun 2021 08:33:10 +0000 Message-ID: <17500_1624350791_60D1A047_17500_121_9_53C29892C857584299CBF5D05346208A4CDF3F3D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <202106170323552620410@zte.com.cn> <1bd54f43-880e-07f9-93cd-7d0aba9266d0@pi.nu> <23638_1624265401_60D052B9_23638_17_1_53C29892C857584299CBF5D05346208A4CDF1B34@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <14386_1624294152_60D0C307_14386_277_1_53C29892C857584299CBF5D05346208A4CDF30CC@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 08:33:19 -0000 Hi Haoyu, Thanks for replying. Please see inline [Bruno] > -----Original Message----- > From: Haoyu Song [mailto:hsong@futurewei.com] > Sent: Monday, June 21, 2021 7:44 PM > To: DECRAENE Bruno INNOV/NET ; Loa > Andersson ; Jeffrey (Zhaohui) Zhang ; > Alexander Vainshtein ; Stewart Bryant > ; draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after the = BoS >=20 > Hi Bruno, >=20 > Thanks for the clarification. We might have some issues using the forced = binding > in some cases. [Bruno] I'm not familiar with this 'forced binding' term. > For example, in our EH architecture, we allow an EH to be inserted > or removed at any nodes on an LSP. [Bruno] As the thread is about EH _indicator_ I'll focus on the indicator. = Draft [1] does not forbid the indicator to be modified en route. [1] https://datatracker.ietf.org/doc/html/draft-decraene-mpls-slid-encoded-= entropy-label-id-01#section-2=20 > Also, ELI+EI are two labels, which is more > expensive than one SPL solution. [Bruno] It would be more expensive only in the case that EL is not needed/useful AN= D that one SPL be allocated for signaling the EH. In all other cases, it's less expensive.=20 > Having said this, I could list your proposal as a > possible solution. =20 [Bruno] OK. I believe it should, as per the abstract of draft-song-mpls-eh-= indicator > BTW, Kireeti and I have discussed a possible option working in a differen= t way. > We would use a new SPL to indicate multiples things (also by encoding the= unused > TTL/CoS bits): the existence of other special labels in the label stack (= e.g., ELI+EL) > and the existence/location of extension headers after the label stack. Si= nce we > have a new SPL, we have more freedom to define its behavior. [Bruno] Sure it also works. Different tradeoffs. Best regards, --Bruno=20 >=20 > Best, > Haoyu >=20 > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Monday, June 21, 2021 9:49 AM > To: Haoyu Song ; Loa Andersson ; Jeffrey > (Zhaohui) Zhang ; Alexander Vainshtein > ; Stewart Bryant ; > draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after the = BoS >=20 > Hi Haoyu, >=20 > > From: Haoyu Song [mailto:hsong@futurewei.com] > > > > Hi Bruno, > > > > For clarification, does it mean an entropy label must be present in the= packet? >=20 > Yes. (Both ELI and EL.) >=20 > > What if it doesn't have such a label? >=20 > The node requiring the indicator adds the Entropy Label (ELI, EL). I gues= s same > principle as the other options discussed in the Figure 5 of draft-song-mp= ls-eh- > indicator. > In which case you get Entropy information for free (I mean no extra label= ). But from > the entropy standpoint, it would be better to have the EL, ELI pushed by = the > ingress as this is the node which should have the most entropy informatio= n. >=20 > Thanks, > --Bruno >=20 > > Thanks! > > > > Haoyu > > > > -----Original Message----- > > From: bruno.decraene@orange.com > > Sent: Monday, June 21, 2021 1:50 AM > > To: Loa Andersson ; Jeffrey (Zhaohui) Zhang > > ; Alexander Vainshtein > > ; Stewart Bryant > > ; draft-song-mpls-eh-indicator@ietf.org > > Cc: mpls@ietf.org > > Subject: RE: [mpls] Indicators in the stack and ancillary data after > > the BoS > > > > [+ authors of draft-song-mpls-eh-indicator] > > > > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson > > > > > > Jeffrey, > > > > > > > > > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > > > Hi Loa, > > > > > > > >> but I'd like to see the DT address multiple indicators in the > > > >> stack and multiple > > > sets of ancillary data after the BoS. > > > > > > > > I think the earlier emails of this email thread were talking about > > > > multiple indicators > > > in the stack; for multiple set of ancillary data after the BoS, > > > either the extended ACH or the proposed MPLS/generic extension > > > headers or a merge of those proposals should be able to handle it. > > > This is alluded to the DataAfterBOS wiki page. > > > > > > hmm - yes partly, but there are several indicators proposed in > > > several drafts > > > > > > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH indicator > > > > > > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a > > > special purpose label (FAI) as indicators > > > > > > there has also been discussion about putting more than one GAL in > > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > draft-many-mpls-multiple-gal proposes to add a copy of the GAL > > > higher uop the stack so that LSRs with a too shallow maximun > > > readable depth might reach the GAL > > > > > > there has also been discussion about putting more than one GAL in > > > the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > draft-song-mpls-eh-indicator have a list of potential indicators, > > > that is also telling if the EH should be processed on every EH > > > capable node or "just" at ingress and egress > > > > The following draft proposes a way to carry indicators. > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata > > tracker > > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-labe > > l- > > id%23section- > > > 2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b6895f808 > > > d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217 > > > 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > > > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK > > 0XuDLugXG6yP6jRYIlgbDuYrh%2B7uM%3D&reserved=3D0 > > > > It's short (less than one page) and backward compatible for LSR & LER. > > > > Referring to table 5 of draft-song-mpls-eh-indicator it also > > - does not require additional label assuming Entropy Label is already > > used for load balancing > > - does not require an additional scarce resource (Special-Purpose > > MPLS Label > > value) > > - allows location freedom > > - does not need control plane extension > > > > Could the authors of draft-song-mpls-eh-indicator update their table 5 > > in order to include the above draft? > > > > Thanks, > > Regards, > > --Bruno > > > > > > > > The FAI might put ancillary data after the BoS. > > > > > > I think we need to have a comprehensive discussion > > > > > > - first what we want to have > > > - second how when re-direct by an indicator we find the > > > ancillary data that belongs to that indicator. > > > > > > /Loa > > > > > > > > > > > > > > > > > > > > Thanks. > > > > > > > > Jeffrey > > > > > > > > -----Original Message----- > > > > From: Loa Andersson > > > > Sent: Thursday, June 17, 2021 10:46 AM > > > > To: Jeffrey (Zhaohui) Zhang ; Alexander > > > > Vainshtein > > > ; Stewart Bryant > > > > > > > Cc: mpls@ietf.org > > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > > > > ancillary data after > > > the BoS > > > > > > > > [External Email. Be cautious of content] > > > > > > > > > > > > DT, > > > > > > > > Responded to Jeffrey's mail, but it is intended to address the > > > > entire discussion. > > > > > > > > There seem to be enough issues to sort out around the GAL/ACH > > > > pair, and I was worried about a set of other indicators and the > > > > data that they might want to put "after the BoS". So far I have > > > > seen no real effort to address the interference's this might lead t= o. > > > > > > > > Further inline > > > > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > > >> Hi, > > > >> > > > >> It's not clear how we could put a GAL not at a BoS: > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | ACH = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | ACH TLV Header = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | = ~ > > > >> > > > >> ~ zero or more ACH TLVs = ~ > > > >> > > > >> ~ = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | = ~ > > > >> > > > >> ~ G-ACh Message = ~ > > > >> > > > >> ~ = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> Figure 2: G-ACh Packet Payload > > > >> > > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > > > >> any 4-ocet field (i.e. those in the above Figure) after that GAL > > > >> as a > > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > > > >> label+TOS+S+transit > > > >> LSR will think the label stack ends there even though that's just > > > >> part of the ACH. > > > >> > > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > > >> following it? > > > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > > > > set will have other labels after itself. The BoS-bit will be found > > > > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > > > Yes there are issues here, but I'd like to see the DT address > > > > multiple indicators in the stack and multiple sets of ancillary > > > > data after the > > BoS. > > > > > > > > I think we need to nail down the relevant questiuons first, and > > > > start working on solutions after that. > > > > > > > > /Loa > > > >> > > > >> Jeffrey > > > >> > > > >> *From:*mpls *On Behalf Of *Alexander > > > >> Vainshtein > > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > > >> ancillary data after the BoS > > > >> > > > >> *[External Email. Be cautious of content]* > > > >> > > > >> Stewart, > > > >> > > > >> I fully agree with your statement that "an old implementation > > > >> that received a ToS GAL not at BoS would at best throw an > > > >> exception or worst be unpredictable". > > > >> > > > >> Regarding your statement "it is OK to have multiple GALs and GALs > > > >> not at BoS IFF the creator of the LSP ensured that all LSRs on > > > >> the LSP, including ECMP and FRR paths that found the GAL at ToS > > > >> were known to be able to process it correctly": > > > >> > > > >> 1. I fully agree with this statement as a general restriction > > > >> 2. Quite a lot of things have to be done in order to make this > > > >> restriction work including at least: > > > >> > > > >> 1. The definition of correct processing of GAL at ToS but no= t at > > > >> BoS must be provided > > > >> 2. Advertisement of ability to process GAL not at BoS correc= tly in > > > >> IGP and BGP must be defined > > > >> 3. Ability to set up network-wide paths that only cross node= s that > > > >> process GAL correctly must be provided for different tech= niques > > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > > >> > > > >> It is still possible that, after all this work, we shall find out > > > >> that the benefits of supporting GAL at ToS but not BoS will be > > > >> only available in the networks where all the nodes support the > > > >> new functionality because presence of non-supporting nodes > > > >> imposes too many restrictions on connectivity and/or resilience. > > > >> > > > >> Regards, > > > >> > > > >> Sasha > > > >> > > > >> Office: +972-39266302 > > > >> > > > >> Cell: +972-549266302 > > > >> > > > >> Email: Alexander.Vainshtein@rbbn.com > > > > > > >> > > > >> *From:*Stewart Bryant > > >> > > > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > > >> *To:* Alexander Vainshtein > > >> > > > > >> *Cc:* Stewart Bryant > > >> >; gregory.mirsky@ztetx.com > > > >> ; mpls@ietf.org > > > >> > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > > >> ancillary data after the BoS > > > >> > > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > > >> > > >> > wrote: > > > >> > > > >> While that might be the case, I think that the Open DT may gi= ve it a > > > >> try and investigate how the existing systems will handle GAL = being > > > >> not the BoS label. > > > >> > > > >> */[[Sasha]] Great minds think alike! One useful step could be > > > >> collecting the known actual behavior of popular implementatio= ns in > > > >> this case, say, by running a survey among the vendors - what = do you > > > >> think?/* > > > >> > > > >> That is actually a considerable amount of work that will take a wh= ile. > > > >> > > > >> It seems to me that an old implementation that received a ToS GAL > > > >> not at BoS would at best throw an exception or worst be unpredicta= ble. > > > >> > > > >> The original assumed processing model is to take the context of > > > >> the PW label or PW+FAT label, discover the GAL and then process > > > >> the GAL in the context of the PW label. > > > >> > > > >> When we extended GAL to apply to LSPs we again had the model that > > > >> the GAL operated in the context of the LSP label that preceded it > > > >> for context. It was still BoS. > > > >> > > > >> Putting the GAL further up the stack is a new behaviour. > > > >> > > > >> If it arrives at an LSR that knows the new semantic all is good. > > > >> > > > >> If it arrives at an LSR that does not know the new semantic then > > > >> > > > >> a) An error has occurred either in setting up the LSP, or in forwa= rding. > > > >> > > > >> b) The behaviour at the receiving node is unpredictable, but in > > > >> any well written implementation should just result in the packet > > > >> being dropped and counted as with any other Mal-formed packet. > > > >> > > > >> So I would think that it is OK to have multiple GALs and GALs not > > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > > > >> LSP, including ECMP and FRR paths that found the GAL at ToS were > > > >> known to be able to process it correctly. > > > >> > > > >> A GAL not at BoS and not at ToS should not be inspected or > > > >> processed by any LSR that did not know what it was doing, and to > > > >> attempt to precess it would be a violation of the normal MPLS > > > >> processing > > model. > > > >> > > > >> - Stewart > > > >> > > > >> > > > >> Notice: This e-mail together with any attachments may contain > > > >> information of Ribbon Communications Inc. and its Affiliates that > > > >> is confidential and/or proprietary for the sole use of the > > > >> intended recipient. Any review, disclosure, reliance or > > > >> distribution by others or forwarding without express permission > > > >> is strictly prohibited. If you are not the intended recipient, > > > >> please notify the sender immediately and then delete all copies, i= ncluding > any attachments. > > > >> > > > >> > > > >> Juniper Business Use Only > > > >> > > > >> > > > >> _______________________________________________ > > > >> mpls mailing list > > > >> mpls@ietf.org > > > >> > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fur > > > ld > > > > > > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo% > > 2F > > > > > > mpls__%3B!!NEt6yM&data=3D04%7C01%7Chsong%40futurewei.com%7C08d72 > > 2072 > > > > > > 7794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1% > > 7C6 > > > > > > 37598622176314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC > > JQIjoi > > > > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DzE3QHyImI86j > > 7K > > > zn9PKE5qasAU01YKm%2FbbpXg6g4hAc%3D&reserved=3D0 > > > aO-gk!RVgTGVbknjgIjv3x- > > > q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ > > > >> > > > > > > > > -- > > > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > > > Juniper Business Use Only > > > > > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fw= ww. > > > > > > ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40futur > > e > > > > > > wei.com%7C08d7220727794b6895f808d934919550%7C0fee8ff2a3b240189c753a1 > > d5 > > > > > > 591fedc%7C1%7C1%7C637598622176324952%7CUnknown%7CTWFpbGZsb3d8e > > yJWIjoiM > > > > > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&am > > p;s > > > > > > data=3Db7TztzRbKspQdyrJ8%2Btps6IeLQlCl3E0mrgvJRydlTk%3D&reserved=3D0 > > > > > ______________________________________________________________________ > > ___________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations > > confidentielles ou privilegiees et ne doivent donc pas etre diffuses, > > exploites ou copies sans autorisation. 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Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Tue Jun 22 03:16:22 2021 Return-Path: X-Original-To: mpls@ietf.org Delivered-To: mpls@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D62263A1F28; Tue, 22 Jun 2021 03:16:19 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Matthew Bocci via Datatracker To: Cc: draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org, mpls@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.32.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <162435697982.20888.15632919512022906429@ietfa.amsl.com> Reply-To: Matthew Bocci Date: Tue, 22 Jun 2021 03:16:19 -0700 Archived-At: Subject: [mpls] Rtgdir early review of draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04 X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 10:16:20 -0000 Reviewer: Matthew Bocci Review result: Has Nits I have been selected as the RTG DIR reviewer for draft-ietf-mpls-lsp-ping-ospfv3-codepoint. Thanks for the draft. This is clear and well written. I have just a couple of minor editorial nits, below, that should be fixed prior to publication. Regards Matthew Abstract: s/Segment SUb-TLV/Segment Sub-TLV 1. Introduction s/"Protocol in the Segment IS Sub-TLV"/"Protocol in the Segment ID Sub-TLV" From nobody Tue Jun 22 05:37:11 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D4B183A238D for ; Tue, 22 Jun 2021 05:37:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.08 X-Spam-Level: X-Spam-Status: No, score=-2.08 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_FILL_THIS_FORM_SHORT=0.01, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=rbbn.com header.b=F+9Ru/dk; dkim=fail (1024-bit key) reason="fail (body has been altered)" header.d=sonusnetworks.onmicrosoft.com 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c/lfx03dMbiFqFpwsZ0YzfwILjviwjWanmwv2BF/Vo5mdVKOVngwSLJzxGSNVAKjYZQ9mU7UFJArxH8+Vzbp5Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO2PR03MB2326 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 13:27:26 -0000 --_000_MW4PR03MB6395E25BC8D22EE5246CD4B2F6099MW4PR03MB6395namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable John, Lots of thanks for your comment. A few points: 1. I have sent the previous email as a response to your aside claim = that "RFC 8662 does not define what a transit LSR should do when it finds = an [ELI, EL] pair at the top of the MPLS label stack, either when it under= stands the label pair or when it doesn't". As I see it, both Bruno and I h= ave demonstrated that this behavior is defined 2. My reading of your comment to my response "If that's the behavior= that we want, then RFC 8662 is not deployable" is that: a. You agree that some behavior has been defined in RFC 8662 b. You claim that the defined behavior makes RFC 8662 non-deployable= 3. I respectfully disagree with (2b) above because: a. My reading of RFC 6790 is that {ELI, EL} pairs in any case can be= only inserted if the node that receives ELI at the top of the stack has s= ignaled its capability to handle such a pair b. While RFC 8662 does not define any mechanisms for signaling abili= ty to handle {ELI, EL} pair at the top of the stack, it provides Informati= onal references to a couple of drafts that define such signaling in IS-IS = and OSPF, and these drafts have been already approved for publication as R= FCs c. With this signaling in place in an SR domain, {ELI, EL} pairs can= be inserted in the label stack in the following positions: i. Imm= ediately following an IGP Prefix SID that has been advertised (with PHP) b= y a node that has signaled its capability to support {ELI, EL} ii. Imme= diately following an Adjacency SID that represents an IGP adjacency betwee= n the advertising node and the node that signaled its capability to suppor= t {ELI, EL} d. Depending on specific network topology and the specific stack of = SIDs, the rules above may be too restrictive to provide effective load bal= ancing, or not. But IMHO and FWIW this is not really different from the si= tuation with=20"vanilla" RFC 6790 if, e.g., some of the PEs where a given = L3VPN service is represented, have advertised their ability to handle {ELI= , EL} via LDP or RSVP-TE, and some did not advertise such capability. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake Sent: Monday, June 21, 2021 9:56 PM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zha= ng ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Comment inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Monday, June 21, 2021 11:46 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Ande= rsson > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and = 5, an egress LSR that signals both = ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]= . [JD] If that's the behavior that we want, then RFC 8662 is not deployable= . All that is needed is to clarify the (rather, self-evident) rules for SIDs= for which the originating routers effectively signal Implicit Null (exp= licitly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared i= n IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the BG= P-LU route. I do not think that I have missed anything (Binding SIDs are not involved = in PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing= several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it= finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf= Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR= ?" my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not B= oS to an existing standards-compliant MPLS forwarder, it will not know how= to handle it since such handling has not ever been defined - not in RFC 5= 586 and not anywhere el= se. Stewart has responded that "an old implementation that received a ToS = GAL not at BoS would at best throw an exception or worst be unpredictable"= . Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would=20guarantee that= packets with GAL in the middle of the stack only pass thru new LSRs that = know how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that imme= diately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the stru= ctures that can be used for this purpose (as you have said, "we can carry = everything in the associated channel", including TLVs and Sub-TLVs, if nec= essary - it will be up to the specific applications to process such struct= ures in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogn= ize new ACH types to meddle with the information carried in the ACH while = forwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to= meddle with the information carried in the ACH (similar to what has been = done in RFC 8169) even i= f they cannot detect presence of GAL at BoS due to the depth of the stack.= I cannot say whether this approach is good enough for the specific set of = applications. But it looks to me as reasonably safe since it does not requ= ire any new forwarding functionality in existing LERs - primum non nocere<= https://clicktime.symantec.com/3QMnW2BUztofokYXW2fRkBn6H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fclicktime.symantec.com%2F3GdXcZMxHHLv= CC23kWNFkFG6H2%3Fu%3Dhttps%2A3A%2A2F%2A2Furldefense.com%2A2Fv3%2A2F__https= %2A3A%2A2Fen.wikipedia.org%2A2Fwiki%2A2FPrimum_non_nocere__%2A3B%2A21%2A21= NEt6yMaO-gk%2A21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMI1= UZKH0%2A24__%3BJSUlJSUlJSUlJSUlJSU%21%21NEt6yMaO-gk%21Uk8p6mR2CzJJFXxJuweT= WC-0CDe7odXjIzcOP6yLGVqs-46um02ro1mHSI9qHKg%24>. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart = Bryant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make = sure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement.= Logically this means that we can carry everything in the associated channe= l. However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffre= y (Zhaohui) Zhang > >; Alexander Vainshtein > >; S= tewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >>=20but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > >=20 >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf=20Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a whil= e. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forward= ing. > > =20>> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model.= > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= https://clicktime.symantec.com/3LbDZkybzjLKby6DAk88iUh6H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fclicktime.symantec.com%2F3G18FNxso3yy= sVeGE2oYas86H2%3Fu%3Dhttps%2A3A%2A2F%2A2Furldefense.com%2A2Fv3%2A2F__https= %2A3A%2A2Fclicktime.symantec.com%2A2F32ELHVPxdZe1NeGCU5oipbG6H2%2A3Fu%2A3D= https%2A2A3A%2A2A25__%2A3BJSU%2A21%2A21NEt6yMaO-gk%2A21QiStnftbs7rzJ6JZRtx= hV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMnORLvEs%2A24__%3BJSUlJSUlJSUlJSUlJSUl= JSU%21%21NEt6yMaO-gk%21Uk8p6mR2CzJJFXxJuweTWC-0CDe7odXjIzcOP6yLGVqs-46um02= ro1mHiE0sPVM%24> > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > >=20 > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2= > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. --_000_MW4PR03MB6395E25BC8D22EE5246CD4B2F6099MW4PR03MB6395namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

John,

Lots of thanks for yo= ur comment.

 

A few points:

1.       I have sent the previous email as a response to your aside cla= im that “RFC 8662 does not define what a transit LSR should d= o when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the label pair or whe= n it doesn't”. As I see it, both Bruno= and I have demonstrated that this behavior is defined

2.       My reading of your comment to my response “= If that’s the behavior that we want, then RFC 8662 is not deployable= ” is that:

a. &n= bsp;     You agree that some behavior has been defined in RFC 8662=

b. &n= bsp;     You claim that the defined behavior makes RFC 8662 non-deploya= ble

3.       I respectfully disagree with (2b) above because:

a. &n= bsp;     My reading of RFC 6790 is that {ELI, EL} pairs in any case can= be only inserted if the node that receives ELI at the top of the stack ha= s signaled its capability to handle such a pair

b. &n= bsp;     While RFC 8662 does not define any mechanisms for signaling ab= ility to handle {ELI, EL} pair at=20the top of the stack, it provides Info= rmational references to a couple of drafts that define such signaling in IS-IS and OSPF, and these drafts have been = already approved for publication as RFCs

c. &n= bsp;     With this signaling in place in an SR domain, {ELI, EL} pairs = can be inserted in the label stack in the following positions:<= /span>

 &nbs= p;            =             &n= bsp;           &nbs= p;            =             i. &nbs= p;    Immediately following an IGP Prefix SID t= hat has been advertised (with PHP) by a node that has signaled its capabil= ity to support {ELI, EL}

 &nbs= p;            =             &n= bsp;           &nbs= p;            =           ii. &nb= sp;    Immediately following an Adjacency SID t= hat represents an IGP adjacency between the advertising node and the node = that signaled its capability to support {ELI, EL}

d. &n= bsp;     Depending on specific network topology and the specific stack = of SIDs, the rules above may be too restrictive to provide effective load = balancing, or not. But IMHO and FWIW this is not really different from the situation with “vanilla” RFC= 6790 if, e.g., some of the PEs where a given L3VPN service is represented= , have advertised their ability to handle {ELI, EL} via LDP or RSVP-TE, an= d some did not advertise such capability.  

My 2c,

Sasha

 

Office: +972-39266302=

Cell:  &nbs= p;   +972-549266302

Email:   Al= exander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>= ;
Sent: Monday, June 21, 2021 9:56 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey = (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Anderss= on <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Monday, June 21, 2021 11:46 AM
To: John E Drake <jdrake@j= uniper.net>
Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

= [External Em= ail. Be cautious of content]

 

John,

“Great minds th= ink alike”.

 

Regarding your aside = comment on RFC 8662:

The last para of Section 4.3 of RFC 6790 says:

 

   As stated in Sections 4.1 and 5, an egress LSR that signals both ELC
 &=
nbsp; and implicit null MUST pop the ELI and the next label (which sh=
ould
&n=
bsp;  be the EL), if it encounters a packet with the ELI as the topmo=
st
&n=
bsp;  label.  Any other LSR (including PHP LSRs) MUST drop such =
packets, as
   per Section 3.18 of [RFC3031].
 
[JD]  If that’s the behavior that we want, then RF=
C 8662 is not deployable.

 

All that is needed is= to clarify the (rather, self-evident) rules for SIDs for which the origin= ating routers  effectively signal Implicit Null  (explicitly or = implicitly), including:

  1. Al= l Adj-SIDs
  2. All EPE SIDs
  3. IGP Prefix SIDs that have been advertis= ed with PHP (P-flag cleared in IS-IS, NP-flag cleared in OSPF)<= /li>
  4.  

    I do not think that I= have missed anything (Binding SIDs are not involved in PHP).

     

    My 2c,

    Sasha

     

    Office: +972-39266302=

    Cell:  &nbs= p;   +972-549266302

    Email:   Alexander.Vainshtein@rbbn.com

     

    From: John E Drake <jdrake@juniper.net>
    Sent: Monday, June 21, 2021 3:52 PM
    To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
    Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
    Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the=20BoS

     

    Hi,

     

    I agree with Sasha’s email, below, which is p= roposing what I was proposing several months ago.

     

    As an aside, RFC 8662 does not define what a transi= t LSR should do when it finds an [ELI, EL] pair at the top of the MPLS lab= el stack, either when it understands the label pair or when it doesn't.

     

    Yours Irrespectively,

     

    John

     

     

    Juniper Business Use Only

    From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
    Sent: Monday, June 21, 2021 6:55 AM
    To: Loa Andersson <loa@pi.nu>= ;
    Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
    Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

     

    = [External Em= ail. Be cautious of content]

     

    Loa,

    Regarding your question “Would you include= adding a copy of the GAL higher up in the stack to make sure that it is w= ithin readable depth for any LSR?”  my answer is NO.=

     

    I have already said on this thread that if GAL i= s exposed as ToS but not BoS to an existing standards-compliant MPLS forwa= rder, it will not know how to handle it since such handling has not ever b= een defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an o= ld implementation that received a ToS GAL not at BoS would at best throw a= n exception or worst be unpredictable”.  Neither of these optio= ns sounds optimistic to me.

     

    I also do not favor investing into a technique t= hat would guarantee that packets with GAL in the middle of the stack only = pass thru new LSRs that know how to handle them .

     

    However, it is quite possible to do the followin= g IMHO:

    1. Retain the exist= ing definitions of GAL just at BoS and ACH that immediately follows the Bo= S
    2. Define new ACH types that can carry new ancillary data, and the structure= s that can be used for this purpose (as you have said, “we can carry= everything in the associated channel”, including TLVs and Sub-TLVs,= if necessary – it will be up to the specific applications to proces= s such structures in ACH, but at least this would not affect MPLS forwardi= ng).
    3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogniz= e new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way
    4. Also allow usage of TTL to help L= ERs that recognize new ACH types to meddle with the information carried in= the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the= depth of the stack.

     

    I cannot say whether this approach is good enoug= h for the specific set of applications. But it looks to me as reasonably s= afe since it does not require any new forwarding functionality in existing= LERs - primum non nocere.

     

    My 2c,

    Sasha

     

    Office: +972-39266302

    Cell:      +972-5492663= 02

    Email:   Alexander.Vainshtein@rbbn.com

     

     

    -----Original Message-----
    From: Loa Andersson <loa@pi.nu> Sent: Monday, June 21, 2021 1:16 PM
    To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
    Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gma= il.com>
    Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS

     

    Sasha,

     

     

    On 21/06/2021 11:55, Alexander Vainshtein wrote:=

    > Loa and all,

    >

    > I fully agree with the proposal "to no= t tamper with ACH anymore".

    >

    >  From my POV, this includes (by implic= ation) not tampering also with

    > GAL as well.

     

    Would you include adding a copy of the GAL highe= r up in the stack to make sure that it is within readable depth for any LS= R?

    >

    > As for the question " If the slot imme= diately after the label stack is

    > reserved for the ACH does this mean the no = other ancillary data may be

    > inserted in this position, e.g. MPLS EH's, = given that there is a GAL

    > in the stack" the answer, IMHO, is YES= .

    >

    > However, it is quite possible to carry any = kind of new information in

    > the ACH, similar to the way this has been d= one in Section 3 of RFC

    > 8169

    > <https://click= time.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker= .ietf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

     

    Logically this means that we can carry everythin= g in the associated channel. However there can only one ACH per packet, ri= ght?

     

    /Loa

    >

    > Regards,

    >

    > Sasha

    >

    > Office: +972-39266302

    >

    > Cell:      +972-54= 9266302

    >

    > Email:   Alexander.Vainshtein= @rbbn.com

    >

    > -----Original Message-----

    > From: Loa Andersson <loa@pi.nu<= /span>>

    > Sent: Monday, June 21, 2021 12:40 PM

    > To: Haoyu Song <hsong= @futurewei.com>; Jeffrey (Zhaohui) Zhang

    > <zz= hang=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

    > <Alexander.= Vainshtein@rbbn.com>; Stewart Bryant

    > <stewart.bryant@= gmail.com>

    > Cc: mpls@ietf.org

    > Subject: Re: [mpls] [EXTERNAL] Indicators i= n the stack and ancillary

    > data after the BoS

    >

    > Haoyu, DT

    >

    > On 17/06/2021 18:56, Haoyu Song wrote:=

    >

    >  > My opinion is to not tamper with= ACH anymore because it's designed

    > for control channel only and so far for a s= pecial scenario. The

    > constraints on GAL and format of ACH are ha= rd to adapt to the new use

    > case requirements.

    >

    >  >

    >

    > I think this is a position that is possible= to defend.

    >

    > One question though.

    >

    > RFC 5586 specifies "that the ACH appea= rs immediately after the bottom

    > of the label stack."

    >

    > If the slot immediately after the label sta= ck is reserved for the ACH

    > does this mean the no other ancillary data = maybe inserted in this

    > position, e.g. MPLS EH's, given that there = is a GAL in the stack?

    >

    > /Loa

    >

    >  > Thanks!

    >

    >  > Haoyu

    >

    >  >

    >

    >  > -----Original Message-----<= /o:p>

    >

    >  > From: mpls <mpls-bounces@ietf.org <mailto:mpl= s-bounces@ietf.org>>

    > On Behalf Of Jeffrey (Zhaohui)

    >

    >  > Zhang

    >

    >  > Sent: Thursday, June 17, 2021 8:= 02 AM

    >

    >  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Al= exander

    > Vainshtein

    >

    >  > <Alexander.Vainshtein@rbbn.co= m

    > <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

    >

    >  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

    >

    >  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

    >

    >  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

    > ancillary

    >

    >  > data after the BoS

    >

    >  >

    >

    >  > Hi Loa,

    >

    >  >

    >

    >  >> but I'd like to see the DT a= ddress multiple indicators in the

    > stack and multiple sets of ancillary data a= fter the BoS.

    >

    >  >

    >

    >  > I think the earlier emails of th= is email thread were talking about

    > multiple indicators in the stack; for multi= ple set of ancillary data

    > after the BoS, either the extended ACH or t= he proposed MPLS/generic

    > extension headers or a merge of those propo= sals should be able to

    > handle it. This is alluded to the DataAfter= BOS wiki page.

    >

    >  >

    >

    >  > Thanks.

    >

    >  >

    >

    >  > Jeffrey

    >

    >  >

    >

    >  > -----Original Message-----<= /o:p>

    >

    >  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

    >

    >  > Sent: Thursday, June 17, 2021 10= :46 AM

    >

    >  > To: Jeffrey (Zhaohui) Zhang <= zzhang@juniper.net

    > <<= span style=3D"color:windowtext;text-decoration:none">mailto:zzhang@juniper= .net>>; Alexander Vainshtein

    >

    >  > <Alexander.Vainshtein@rbbn.co= m

    > <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

    >

    >  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

    >

    >  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

    >

    >  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

    > ancillary

    >

    >  > data after the=20BoS<= /p>

    >

    >  >

    >

    >  > [External Email. Be cautious of = content]

    >

    >  >

    >

    >  >

    >

    >  > DT,

    >

    >  >

    >

    >  > Responded to Jeffrey's mail, but= it is intended to address the

    > entire discussion.

    >

    >  >

    >

    >  > There seem to be enough issues t= o sort out around the GAL/ACH pair,

    > and I was worried about a set of other indi= cators and the data that

    > they might want to put "after the BoS&= quot;. So far I have seen no real

    > effort to address the interference's this m= ight lead to.

    >

    >  >

    >

    >  > Further inline

    >

    >  >

    >

    >  >

    >

    >  > On 17/06/2021 16:15, Jeffrey (Zh= aohui) Zhang wrote:

    >

    >  >> Hi,

    >

    >  >>

    >

    >  >> It's not clear how we could = put a GAL not at a BoS:

    >

    >  >>

    >

    >  >>

    >

    >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    >

    >  >>

    >

    >  >>     = ; |            = ;            &= nbsp;     ACH       = ;            &= nbsp;         

    > |

    >

    >  >>

    >

    >  >>

    >

    >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    >

    >  >>

    >

    >  >>     = ; |            = ;             = ACH TLV Header          =             &n= bsp;

    > |

    >

    >  >>

    >

    >  >>

    >

    >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    >

    >  >>

    >

    >  >>     = ; |            = ;            &= nbsp;           &nb= sp;            &nbs= p;            =  

    > ~

    >

    >  >>

    >

    >  >>     = ; ~            = ;         zero or more ACH TLVs&nb= sp;            = ;       

    > ~

    >

    >  >>

    >

    >  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

    > |

    >

    >  >>

    >

    >  >>

    >

    >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    >

    >  >>

    >

    >  >>     = ; |            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

    > ~

    >

    >  >>

    >

    >  >>     = ; ~            = ;            G-ACh = Message           &= nbsp;           &nb= sp; 

    > ~

    >

    >  >>

    >

    >  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

    > |

    >

    >  >>

    >

    >  >>

    >

    >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    >

    >  >>

    >

    >  >>     = ;            &= nbsp;       Figure 2: G-ACh Packet Payload

    >

    >  >>

    >

    >  >> If the GAL does not have S-b= it set, wouldn't a transit LSR treat

    > any

    >

    >  >> 4-ocet field (i.e. those in = the above Figure) after that GAL as a

    >

    >  >> label+TOS+S+TTL? If that 4-o= ctet field has the S-bit set, the

    > transit

    >

    >  >> LSR will think the label sta= ck ends there even though that's just

    >

    >  >> part of the ACH.<= /p>

    >

    >  >>

    >

    >  >> Or are you saying that a GAL= not at the BoS will not have the ACH

    >

    >  >> following it?

    =

    >

    >  >

    >

    >  > Well, as far as I understand a G= AL which does not have the NoS-bit

    > set will have other labels after itself. Th= e BoS-bit will be found

    > deeper down stack and the ACH will immediat= ely fo9llow the BoS.

    >

    >  >

    >

    >  > Yes there are issues here, but I= 'd like to see the DT address

    > multiple indicators in the stack and multip= le sets of ancillary data

    > after the BoS.

    >

    >  >

    >

    >  > I think we need to nail down the= relevant questiuons first, and

    > start working on solutions after that.=

    >

    >  >

    >

    >  > /Loa

    >

    >  >>

    >

    >  >> Jeffrey

    >

    >  >>

    >

    >  >> *From:*mpls <mpls-bounces@ietf.org <mailt= o:mpls-bounces@ietf.org>>

    > *On Behalf Of *Alexander

    >

    >  >> Vainshtein

    >

    >  >> *Sent:* Thursday, June 17, 2= 021 5:07 AM

    >

    >  >> *To:* Stewart Bryant <ste= wart.bryant@gmail.com

    > <mailto:stewart.= bryant@gmail.com>>

    >

    >  >> *Cc:* mpls@ietf= .org <mailto:mpls@ietf.org><= /o:p>

    >

    >  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

    >

    >  >> ancillary data after the BoS=

    >

    >  >>

    >

    >  >> *[External Email. Be cautiou= s of content]*

    >

    >  >>

    >

    >  >> Stewart,

    >

    >  >>

    >

    >  >> I fully agree with your stat= ement that "an old implementation that

    >

    >  >> received a ToS GAL not at Bo= S would at best throw an exception or

    >

    >  >> worst be unpredictable"= .

    >

    >  >>

    >

    >  >> Regarding your statement &qu= ot;it is OK to have multiple GALs and GALs

    > not

    >

    >  >> at BoS IFF the creator of th= e LSP ensured that all LSRs on the

    > LSP,

    >

    >  >> including ECMP and FRR paths= that found the GAL at ToS were known

    > to

    >

    >  >> be able to process it correc= tly":

    >

    >  >>

    >

    >  >>   1. I fully agree= with this statement as a general restriction  2.

    >

    >  >> Quite a lot of things have t= o be done in order to make this

    >

    >  >>     = ; restriction work including at least:

    >

    >  >>

    >

    >  >>     = ;  1. The definition of correct processing of GAL at=20ToS but

    > not at

    >

    >  >>     = ;     BoS must be provided

    >

    >  >>     = ;  2. Advertisement of ability to process GAL not at BoS

    > correctly in

    >

    >  >>     = ;     IGP and BGP must be defined

    >

    >  >>     = ;  3. Ability to set up network-wide paths that only cross

    > nodes that

    >

    >  >>     = ;     process GAL correctly must be provided for diffe= rent

    > techniques

    >

    >  >>     = ;     (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

    >

    >  >>

    >

    >  >> It is still possible that, a= fter all this work, we shall find out

    >

    >  >> that the benefits of support= ing GAL at ToS but not BoS will be

    > only

    >

    >  >> available in the networks wh= ere all the nodes support the new

    >

    >  >> functionality because presen= ce of non-supporting nodes imposes too

    >

    >  >> many restrictions on connect= ivity and/or resilience.

    >

    >  >>

    >

    >  >> Regards,

    >

    >  >>

    >

    >  >> Sasha

    >

    >  >>

    >

    >  >> Office: +972-39266302

    >

    >  >>

    >

    >  >> Cell:    = ;  +972-549266302

    >

    >  >>

    >

    >  >> Email: Alexander.Vainshtein= @rbbn.com

    > <mailto:Ale= xander.Vainshtein@rbbn.com>

    >

    >  >> <mailto:Alexander.Vainsht= ein@rbbn.com

    > <mailto:Ale= xander.Vainshtein@rbbn.com>>

    >

    >  >>

    >

    >  >> *From:*Stewart Bryant <st= ewart.bryant@gmail.com

    >

    >  >> <mailto:stewart.bryant@gm= ail.com

    > <mailto:stewart.= bryant@gmail.com>>>

    >

    >  >> *Sent:* Thursday, June 17, 2= 021 10:36 AM

    >

    >  >> *To:* Alexander Vainshtein &= lt;Alexander.Vainshtein@rbbn.com

    >

    >  >> <mailto:Alexander.Vainsht= ein@rbbn.com

    > <mailto:Ale= xander.Vainshtein@rbbn.com>>>

    >

    >  >> *Cc:* Stewart Bryant <ste= wart.bryant@gmail.com

    >

    >  >> <mailto:stewart.bryant@gm= ail.com

    > <mailto:stewart.= bryant@gmail.com>>>; gregory.mirsky@ztetx.com

    > <mailto:gregory.= mirsky@ztetx.com>

    >

    >  >> <mailto:gregory.mirsky@zt= etx.com

    > <mailto:gregory.= mirsky@ztetx.com>>;

    > mpls@ietf.org <<= a href=3D"mailto:mpls@ietf.org">mailto:mpls@ietf.org>

    >

    >  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>= ;>

    >

    >  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

    >

    >  >> ancillary data after the BoS=

    >

    >  >>

    >

    >  >>     = ; On 17 Jun 2021, at 07:45, Alexander Vainshtein

    >

    >  >>     = ; <Alexander.Vainshtein@rbbn.com

    >

    >  >>     = ; <mailto:Alexander.Vainshtein@rbbn.com

    > <mailto:Ale= xander.Vainshtein@rbbn.com>>> wrote:

    >

    >  >>

    >

    >  >>     = ; While that might be the case, I think that the Open DT may

    > give it a

    >

    >  >>     = ; try and investigate how the existing systems will handle GAL

    > being

    >

    >  >>     = ; not the BoS label.

    >

    >  >>

    >

    >  >>     = ; */[[Sasha]] Great minds think alike! One useful step could be=

    >

    >  >>     = ; collecting the known actual behavior of popular

    > implementations in

    >

    >  >>     = ; this case, say, by running a survey among the vendors - what

    > do you

    >

    >  >>     = ; think?/*

    >

    >  >>

    >

    >  >> That is actually a considera= ble amount of work that will take a while.

    >

    >  >>

    >

    >  >> It seems to me that an old i= mplementation that received a ToS GAL

    > not

    >

    >  >> at BoS would at best throw a= n exception or worst be unpredictable.

    >

    >  >>

    >

    >  >> The original assumed process= ing model is to take the context of

    > the

    >

    >  >> PW label or PW+FAT label, di= scover the GAL and then process the

    > GAL

    >

    >  >> in the context of the PW lab= el.

    >

    >  >>

    >

    >  >> When we extended GAL to appl= y to LSPs we again had the model that

    > the

    >

    >  >> GAL operated in the context = of the LSP label that preceded it for

    >

    >  >> context. It was still BoS.

    >

    >  >>

    >

    >  >> Putting the GAL further up t= he stack is a new behaviour.

    >

    >  >>

    >

    >  >> If it arrives at an LSR that= knows the new semantic all is good.

    >

    >  >>

    >

    >  >> If it arrives at an LSR that= does not know the new semantic then

    >

    >  >>

    >

    >  >> a) An error has occurred eit= her in setting up the LSP, or in forwarding.

    >

    >  >>

    >

    >  >> b) The behaviour at the rece= iving node is unpredictable, but in

    > any

    >

    >  >> well written implementation = should just result in the packet being

    >

    >  >> dropped and counted as with = any other Mal-formed packet.

    >

    >  >>

    >

    >  >> So I would think that it is = OK to have multiple GALs and GALs not

    > at

    >

    >  >> BoS IFF the creator of the L= SP ensured that all LSRs on the LSP,

    >

    >  >> including ECMP and FRR paths= that found the GAL at ToS were known

    > to

    >

    >  >> be able to process it correc= tly.

    >

    >  >>

    >

    >  >> A GAL not at BoS and not at = ToS should not be inspected or

    > processed

    >

    >  >> by any LSR that did not know= what it was doing, and to attempt to

    >

    >  >> precess it would be a violat= ion of the normal MPLS processing model.

    >

    >  >>

    >

    >  >> - Stewart

    >

    >  >>

    >

    >  >>

    >

    >  >> Notice: This e-mail together= with any attachments may contain

    >

    >  >> information of Ribbon Commun= ications Inc. and its Affiliates that

    > is

    >

    >  >> confidential and/or propriet= ary for the sole use of the intended

    >

    >  >> recipient. Any review, discl= osure, reliance or distribution by

    > others

    >

    >  >> or forwarding without expres= s permission is strictly prohibited.

    > If

    >

    >  >> you are not the intended rec= ipient, please notify the sender

    >

    >  >> immediately and then delete = all copies, including any attachments.

    >

    >  >>

    >

    >  >>

    >

    >  >> Juniper=20Business Use Only<= o:p>

    >

    >  >>

    >

    >  >>

    >

    >  >> ____________________________= ___________________

    >

    >  >> mpls mailing list=

    >

    >  >> mpls@ietf.org <mailto:mpls@ietf.org><= /p>

    >

    >  >>

    > https://clicktime.sy= mantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= /p>

    > <https://clicktime.symantec.com/32ELHVPx= dZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

    > 25>

    >

    >  >>

    > 2F%2Fnam11.safelinks.protection.outlook.com= %2F%3Furl%3Dhttps%253A%252

    >

    >  >> F%252Furld

    >

    >  >>

    > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.= org%2Fmailman%2Flistinfo%2

    >

    >  >> F

    >

    >  >>

    > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8o= b1JglFKOP6qKkgAcCSPbeBMMj2

    >

    >  >> A

    >

    >  >>

    > nexFnPevXopeK1a6u%24&amp;data=3D04%7C01= %7Chsong%40futurewei.com%7Ccc49d

    >

    >  >> e

    >

    >  >>

    > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240= 189c753a1d5591fedc%7C1%7C0

    >

    >  >> %

    >

    >  >>

    > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3= d8eyJWIjoiMC4wLjAwMDAiLCJQ

    >

    >  >> I

    >

    >  >>

    > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C1000&amp;sdata=3D5et4Juc3Ij

    >

    >  >> G

    >

    >  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3= F6h34Q%3D&amp;reserved=3D0

    >

    >  >>

    >

    >  >

    >

    >  > --

    >

    >  >

    >

    >  > Loa Andersson   &= nbsp;           &nb= sp;        email: loa@pi.nu=

    > <mailto:loa@pi.nu>= ;

    >

    >  > Senior MPLS Expert loa.pi.nu@gmail.com<= /span> <mailto:loa.pi.nu@gmail.com>= ;

    >

    >  > Bronze Dragon Consulting &n= bsp;           phone: +4= 6 739 81 21 64

    >

    >  >

    >

    >  > Juniper Business Use Only

    >

    >  > ________________________________= _______________

    >

    >  > mpls mailing list

    =

    >

    >  > mpls@ietf.org <mailto:mpls@ietf.org>

    >

    >  >

    > https://clicktime.sy= mantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2=

    > <https://clicktime.symantec.com/353Ka7if= LCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

    > 252>

    >

    >  >

    > F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252F%

    >

    >  >

    > 252Fwww.ietf.org%252Fmailman%252Flistinfo%2= 52Fmpls%26data%3D04%257C01%

    >

    >  >

    > 257Chsong%2540futurewei.com%257Ccc49de9585a= 24092e29708d931a0e327%257C0

    >

    >  >

    > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0= %257C637595389337881384%257

    >

    >  >

    > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD= AiLCJQIjoiV2luMzIiLCJBTiI6I

    >

    >  >

    > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3D= XQlRpwkgODLRxcIjyMYyPMiCF2K

    >

    >  > DC0Y7GG4O8VGESnw%253D%26reserved= %3D0

    >

    >  >

    >

    > --

    >

    > Loa Andersson     =             &n= bsp;      email: loa@pi.nu=

    > <mailto:loa@pi.nu>= ;

    >

    > Senior MPLS Expert loa.pi.nu@gmail.com<= /span> <mailto:loa.pi.nu@gmail.com>= ;

    >

    > Bronze Dragon Consulting   &= nbsp;         phone: +46 739 81 21= 64

    >

    >

    > Notice: This e-mail together with any attac= hments may contain

    > information of Ribbon Communications Inc. a= nd its Affiliates that is

    > confidential and/or proprietary for the sol= e use of the intended

    > recipient. Any review, disclosure, reliance= or distribution by others

    > or forwarding without express permission is= strictly prohibited. If

    > you are not the intended recipient, please = notify the sender

    > immediately and then delete all copies, inc= luding any attachments.

     

    --

     

    Loa Andersson      = ;             =      email: loa@pi.nu=

    Senior MPLS Expert     =             &n= bsp;        loa.pi.nu@gmail.com<= /span>

    Bronze Dragon Consulting    =          phone: +46 739 81 21 64


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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Comments inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein Sent: Tuesday, June 22, 2021 9:27 AM To: John E Drake Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, Lots of thanks for your comment. A few points: 1. I have sent the previous email as a response to your aside claim = that "RFC 8662 does not define what a transit LSR should do when it finds a= n [ELI, EL] pair at the top of the MPLS label stack, either when it underst= ands the label pair or when it doesn't". As I see it, both Bruno and I have= demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of = the form: "This document updates the transit LSR behavior defined in RFC 6= 790 to allow a transit LSR that understands entropy labels to remove an [EL= I, EL] pair that it sees at the top of an MPLS label stack. This requires = a transit LSR to indicate this capability to other LSRs in the SR domain an= d it requires the ingress LSR to ensure that when it inserts [ELI, EL] pair= s in the MPLS label stack they will only be at the top of the MPLS label st= ack when received by a transit LSR with this capability.". 1. My reading of your comment to my response "If that's the behavior tha= t we want, then RFC 8662 is not deployable" is that: * You agree that some behavior has been defined in RFC 8662 [JD] Your email, to which I responded, referenced RFC 6790 not RFC 8662 an= d I was commenting on this sentence: "Any other LSR (including PHP LSRs) M= UST drop such packets.". I.e., it is referring to non-egress, or transit, = LSRs. * You claim that the defined behavior makes RFC 8662 non-deployable [JD] See my previous comment. 1. I respectfully disagree with (2b) above because: * My reading of RFC 6790 is that {ELI, EL} pairs in any case can be = only inserted if the node that receives ELI at the top of the stack has sig= naled its capability to handle such a pair [JD] RFC 6970 only talks about egress LSRs advertising this capability. b. While RFC 8662 does not define any mechanisms for signaling ability= to handle {ELI, EL} pair at the top of the stack, it provides Informationa= l references to a couple of drafts that define such signaling in IS-IS and = OSPF, and these drafts have been already approved for publication as RFCs [JD] See my first comment above. * With this signaling in place in an SR domain, {ELI, EL} pairs can = be inserted in the label stack in the following positions: i. Immediately f= ollowing an IGP Prefix SID that has been advertised (with PHP) by a node th= at has signaled its capability to support {ELI, EL} [JD] See my first comment above. I am not saying that RFC 8662 doesn't wo= rk. Rather, like RFC 5886 it is under-specified. ii. Immediately f= ollowing an Adjacency SID that represents an IGP adjacency between the adve= rtising node and the node that signaled its capability to support {ELI, EL} * Depending on specific network topology and the specific stack of S= IDs, the rules above may be too restrictive to provide effective load balan= cing, or not. But IMHO and FWIW this is not really different from the situa= tion with "vanilla" RFC 6790 if, e.g., some of the PEs where a given L3VPN = service is represented, have advertised their ability to handle {ELI, EL} v= ia LDP or RSVP-TE, and some did not advertise such capability. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 9:56 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Comment inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Monday, June 21, 2021 11:46 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and 5, an eg= ress LSR that signals both ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]. [JD] If that's the behavior that we want, then RFC 8662 is not deployable. All that is needed is to clarify the (rather, self-evident) rules for SIDs = for which the originating routers effectively signal Implicit Null (expli= citly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared in= IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the BGP= -LU route. I do not think that I have missed anything (Binding SIDs are not involved i= n PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart = has responded that "an old implementation that received a ToS GAL not at Bo= S would at best throw an exception or worst be unpredictable". Neither of = these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cann= ot detect presence of GAL at BoS due to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/3RHS3C2UW8kquG4WD= QJFwvp6H2?u=3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2Fclicktime.sy= mantec.com*2F3R52RdsrwRGTaBhuR2Sd5Qw6H2*3Fu*3Dhttps*2A3A*2A2F*2A2Furldefens= e.com*2A2Fv3*2A2F__https*2A3A*2A2Fclicktime.symantec.com*2A2F353Ka7ifLCb9e7= KAzjZ4fsf6H2*2A3Fu*2A3Dhttps*2A2A3A*2A2A252__*2A3BJSU*2A21*2A21NEt6yMaO-gk*= 2A21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA*2A24__*= 3BJSUlJSUlJSUlJSUlJSUlJSU*21*21NEt6yMaO-gk*21Uk8p6mR2CzJJFXxJuweTWC-0CDe7od= XjIzcOP6yLGVqs-46um02ro1mH2RXrzIw*24__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl= JSUlJSU!!NEt6yMaO-gk!RH_x4Yy-jTEqPMKiyMGCocKS-X0kXu_C0ArR_wJSIAgx76WXM8Mm5x= SMct3koic$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. 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Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB808131C5A8BD9A38CBEBF255C7099BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Comments inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vain= shtein@rbbn.com>
Sent: Tuesday, June 22, 2021 9:27 AM
To: John E Drake <jdrake@juniper.net>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson= <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

Lots of thanks for you= r comment.

 

A few points:

1. &nbs= p;      I have sent the previous email as a response to your aside clai= m that “RFC 8662 does not define what a transit LSR should do = when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the label pair or when it doe= sn't”. As I see it, both Bruno and I ha= ve demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere in= RFC 8662 do I see a statement of the form:  “This document upda= tes the transit LSR behavior defined in RFC 6790 to allow a transit LSR tha= t understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires a= transit LSR to indicate this capability to other LSRs in the SR domain and= it requires the ingress LSR to ensure that when it inserts [ELI, EL] pairs= in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with = this capability.”.

 

  1. My reading of your comment to my response “If that’s the behavior that we want, then RFC 8662 is no= t deployable” is that:
    1. You agree that some behavior has been defined in RFC 8662

 

[JD]  Your email, to which I responded, r= eferenced RFC 6790 not RFC 8662 and I was commenting on this sentence: = ; “Any other LSR (including PHP LSRs) MUST drop such packets.”.=   I.e., it is referring to non-egress, or transit, LSRs.  

 

    1. You claim that the defined behavior makes RFC 8662 non-deployable

 

[JD]  See my previous comment.=

 

  1. I respectfully disagree with (2b) above because:
    1. My reading of RFC 6790 is that {ELI, EL} pairs in any case can be only inse= rted if the node that receives ELI at the top of the stack has signaled its= capability to handle such a pair

 

[JD]   RFC 6970 only talks about egr= ess LSRs advertising this capability.

 

b.      While RFC 8662 does n= ot define any mechanisms for signaling ability to handle {ELI, EL} pair at = the top of the stack, it provides Informational references to a couple of d= rafts that define such signaling in IS-IS and OSPF, and these drafts have been already approved for publicatio= n as RFCs

 

[JD]  See my first comment above.

 

    1. With this signaling in place in an SR domain, {ELI, EL} pairs can be insert= ed in the label stack in the following positions:

  =             &nb= sp;            =             &nb= sp;            =    i.  = ;   = Immediately following an IGP Prefix SID that has been advertised (with PHP)= by a node that has signaled its capability to support {ELI, EL}=

 

[JD]  See my first comment above.  I= am not saying that RFC 8662 doesn’t work.  Rather, like RFC 588= 6 it is under-specified.

 

  =             &nb= sp;            =             &nb= sp;            =   ii. &nbs= p;   Immediately following an Adjacency SID that represents an IGP adjacency be= tween the advertising node and the node that signaled its capability to support {ELI, EL}

    1. Depending on specific network topology and the specific stack of SIDs, the = rules above may be too restrictive to provide effective load balancing, or = not. But IMHO and FWIW this is not really different from the situation with= “vanilla” RFC 6790 if, e.g., some of the PEs where a given L3VPN service is represented, have advertised the= ir ability to handle {ELI, EL} via LDP or RSVP-TE, and some did not adverti= se such capability.  

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Monday, June 21, 2021 9:56 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Monday, June 21, 2021 11:46 AM
To: John E Drake <jdrake@ju= niper.net>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

“Great minds thi= nk alike”.

 

Regarding your aside c= omment on RFC 8662:

The last para of Section 4.3 of RFC 6790 says:

 

   As stated in Sections 4.1 and 5, an egress LSR that signals =
both ELC
 &n=
bsp; and implicit null MUST pop the ELI and the next label (which shou=
ld
&nb=
sp;  be the EL), if it encounters a packet with the ELI as the topmost=

&nb=
sp;  label.  Any other LSR (including PHP LSRs) MUST drop such pa=
ckets, as
   per Section 3.18 of [RFC3031].
 
[JD]  If that’s the behavior that we want, then RFC =
8662 is not deployable.

 

All that is needed is = to clarify the (rather, self-evident) rules for SIDs for which the originat= ing routers  effectively signal Implicit Null  (explicitly or imp= licitly), including:

  1. All= Adj-SIDs
  2. All EPE SIDs
  3. IGP Prefix SIDs that have been advertised = with PHP (P-flag cleared in IS-IS, NP-flag cleared in OSPF)
    4. =
  4. BGP= Prefix SIDs advertised with Implicit Null in the NLRI of  the BGP-LU = route.

 

I do not think that I = have missed anything (Binding SIDs are not involved in PHP).

 

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Monday, June 21, 2021 3:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is pr= oposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transit= LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label= stack, either when it understands the label pair or when it doesn't.<= /o:p>

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include = adding a copy of the GAL higher up in the stack to make sure that it is wit= hin readable depth for any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is= exposed as ToS but not BoS to an existing standards-compliant MPLS forward= er, it will not know how to handle it since such handling has not ever been= defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique th= at would guarantee that packets with GAL in the middle of the stack only pa= ss thru new LSRs that know how to handle them .

 

However, it is quite possible to do the following= IMHO:

  1. Retain the existi= ng definitions of GAL just at BoS and ACH that immediately follows the BoS<= o:p>
  2. De= fine new ACH types that can carry new ancillary data, and the structures th= at can be used for this purpose (as you have said, “we can carry ever= ything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications to process= such structures in ACH, but at least this would not affect MPLS forwarding= ).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recognize ne= w ACH types to meddle with the information carried in the ACH while forward= ing labeled packets in the usual way
  4. Also allow usage of TTL to help LERs tha= t recognize new ACH types to meddle with the information carried in the ACH= (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough= for the specific set of applications. But it looks to me as reasonably saf= e since it does not require any new forwarding functionality in existing LE= Rs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:<= o:p>

> Loa and all,

>

> I fully agree with the proposal "to not= tamper with ACH anymore".

>

>  From my POV, this includes (by implica= tion) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR?=

>

> As for the question " If the slot immed= iately after the label stack is

> reserved for the ACH does this mean the no o= ther ancillary data may be

> inserted in this position, e.g. MPLS EH's, g= iven that there is a GAL

> in the stack" the answer, IMHO, is YES.=

>

> However, it is quite possible to carry any k= ind of new information in

> the ACH, similar to the way this has been do= ne in Section 3 of RFC

> 8169

> <https://clickti= me.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ie= tf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything= in the associated channel. However there can only one ACH per packet, righ= t?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549= 266302

>

> Email:   Alexander.Vainshtein@= rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:<= /o:p>

>

>  > My opinion is to not tamper with = ACH anymore because it's designed

> for control channel only and so far for a sp= ecial scenario. The

> constraints on GAL and format of ACH are har= d to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible = to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appear= s immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label stac= k is reserved for the ACH

> does this mean the no other ancillary data m= aybe inserted in this

> position, e.g. MPLS EH's, given that there i= s a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpls-b= ounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:0= 2 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexa= nder

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT ad= dress multiple indicators in the

> stack and multiple sets of ancillary data af= ter the BoS.

>

>  >

>

>  > I think the earlier emails of thi= s email thread were talking about

> multiple indicators in the stack; for multip= le set of ancillary data

> after the BoS, either the extended ACH or th= e proposed MPLS/generic

> extension headers or a merge of those propos= als should be able to

> handle it. This is alluded to the DataAfterB= OS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:= 46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <z= zhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of c= ontent]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but = it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to= sort out around the GAL/ACH pair,

> and I was worried about a set of other indic= ators and the data that

> they might want to put "after the BoS&q= uot;. So far I have seen no real

> effort to address the interference's this mi= ght lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zha= ohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could p= ut a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;     ACH       &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;            ACH= TLV Header          &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;            =

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;        zero or more ACH TLVs =             &nb= sp;      

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           G-ACh Mes= sage            = ;            &n= bsp;

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     =             &nb= sp;       Figure 2: G-ACh Packet Payload=

>

>  >>

>

>  >> If the GAL does not have S-bi= t set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in t= he above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-oc= tet field has the S-bit set, the

> transit

>

>  >> LSR will think the label stac= k ends there even though that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL = not at the BoS will not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GA= L which does not have the NoS-bit

> set will have other labels after itself. The= BoS-bit will be found

> deeper down stack and the ACH will immediate= ly fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I'= d like to see the DT address

> multiple indicators in the stack and multipl= e sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the = relevant questiuons first, and

> start working on solutions after that.<= /o:p>

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto= :mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 20= 21 5:07 AM

>

>  >> *To:* Stewart Bryant <stew= art.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.o= rg <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >> *[External Email. Be cautious= of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your state= ment that "an old implementation that

>

>  >> received a ToS GAL not at BoS= would at best throw an exception or

>

>  >> worst be unpredictable".=

>

>  >>

>

>  >> Regarding your statement &quo= t;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the= LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly":

>

>  >>

>

>  >>   1. I fully agree = with this statement as a general restriction  2.

>

>  >> Quite a lot of things have to= be done in order to make this

>

>  >>     = restriction work including at least:

>

>  >>

>

>  >>     =   1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     =      BoS must be provided

>

>  >>     =   2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     =      IGP and BGP must be defined

>

>  >>     =   3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     =      process GAL correctly must be provided for differe= nt

> techniques

>

>  >>     =      (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)=

>

>  >>

>

>  >> It is still possible that, af= ter all this work, we shall find out

>

>  >> that the benefits of supporti= ng GAL at ToS but not BoS will be

> only

>

>  >> available in the networks whe= re all the nodes support the new

>

>  >> functionality because presenc= e of non-supporting nodes imposes too

>

>  >> many restrictions on connecti= vity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    =   +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 20= 21 10:36 AM

>

>  >> *To:* Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stew= art.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zte= tx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >>     = On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = <Alexander.Vainshtein@rbbn.com

>

>  >>     = <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = try and investigate how the existing systems will handle GAL

> being

>

>  >>     = not the BoS label.

>

>  >>

>

>  >>     = */[[Sasha]] Great minds think alike! One useful step could be

>

>  >>     = collecting the known actual behavior of popular

> implementations in

>

>  >>     = this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = think?/*

>

>  >>

>

>  >> That is actually a considerab= le amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old im= plementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw an= exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed processi= ng model is to take the context of

> the

>

>  >> PW label or PW+FAT label, dis= cover the GAL and then process the

> GAL

>

>  >> in the context of the PW labe= l.

>

>  >>

>

>  >> When we extended GAL to apply= to LSPs we again had the model that

> the

>

>  >> GAL operated in the context o= f the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up th= e stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that = knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that = does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eith= er in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the recei= ving node is unpredictable, but in

> any

>

>  >> well written implementation s= hould just result in the packet being

>

>  >> dropped and counted as with a= ny other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is O= K to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the LS= P ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly.

>

>  >>

>

>  >> A GAL not at BoS and not at T= oS should not be inspected or

> processed

>

>  >> by any LSR that did not know = what it was doing, and to attempt to

>

>  >> precess it would be a violati= on of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together = with any attachments may contain

>

>  >> information of Ribbon Communi= cations Inc. and its Affiliates that

> is

>

>  >> confidential and/or proprieta= ry for the sole use of the intended

>

>  >> recipient. Any review, disclo= sure, reliance or distribution by

> others

>

>  >> or forwarding without express= permission is strictly prohibited.

> If

>

>  >> you are not the intended reci= pient, please notify the sender

>

>  >> immediately and then delete a= ll copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _____________________________= __________________

>

>  >> mpls mailing list<= /p>

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxd= Ze1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.o= rg%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob= 1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%= 7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b2401= 89c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d= 8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Doh, RFC 5586 not RFC 5886 Yours Irrespectively, John Juniper Business Use Only From: mpls On Behalf Of John E Drake Sent: Tuesday, June 22, 2021 10:06 AM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Hi, Comments inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Tuesday, June 22, 2021 9:27 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, Lots of thanks for your comment. A few points: 1. I have sent the previous email as a response to your aside claim = that "RFC 8662 does not define what a transit LSR should do when it finds a= n [ELI, EL] pair at the top of the MPLS label stack, either when it underst= ands the label pair or when it doesn't". As I see it, both Bruno and I have= demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of = the form: "This document updates the transit LSR behavior defined in RFC 6= 790 to allow a transit LSR that understands entropy labels to remove an [EL= I, EL] pair that it sees at the top of an MPLS label stack. This requires = a transit LSR to indicate this capability to other LSRs in the SR domain an= d it requires the ingress LSR to ensure that when it inserts [ELI, EL] pair= s in the MPLS label stack they will only be at the top of the MPLS label st= ack when received by a transit LSR with this capability.". 1. My reading of your comment to my response "If that's the behavior tha= t we want, then RFC 8662 is not deployable" is that: * You agree that some behavior has been defined in RFC 8662 [JD] Your email, to which I responded, referenced RFC 6790 not RFC 8662 an= d I was commenting on this sentence: "Any other LSR (including PHP LSRs) M= UST drop such packets.". I.e., it is referring to non-egress, or transit, = LSRs. * You claim that the defined behavior makes RFC 8662 non-deployable [JD] See my previous comment. 1. I respectfully disagree with (2b) above because: * My reading of RFC 6790 is that {ELI, EL} pairs in any case can be = only inserted if the node that receives ELI at the top of the stack has sig= naled its capability to handle such a pair [JD] RFC 6970 only talks about egress LSRs advertising this capability. b. While RFC 8662 does not define any mechanisms for signaling ability= to handle {ELI, EL} pair at the top of the stack, it provides Informationa= l references to a couple of drafts that define such signaling in IS-IS and = OSPF, and these drafts have been already approved for publication as RFCs [JD] See my first comment above. * With this signaling in place in an SR domain, {ELI, EL} pairs can = be inserted in the label stack in the following positions: i. Immediatel= y following an IGP Prefix SID that has been advertised (with PHP) by a node= that has signaled its capability to support {ELI, EL} [JD] See my first comment above. I am not saying that RFC 8662 doesn't wo= rk. Rather, like RFC 5886 it is under-specified. ii. Immediately= following an Adjacency SID that represents an IGP adjacency between the ad= vertising node and the node that signaled its capability to support {ELI, E= L} * Depending on specific network topology and the specific stack of S= IDs, the rules above may be too restrictive to provide effective load balan= cing, or not. But IMHO and FWIW this is not really different from the situa= tion with "vanilla" RFC 6790 if, e.g., some of the PEs where a given L3VPN = service is represented, have advertised their ability to handle {ELI, EL} v= ia LDP or RSVP-TE, and some did not advertise such capability. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 9:56 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Comment inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Monday, June 21, 2021 11:46 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and 5, an eg= ress LSR that signals both ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]. [JD] If that's the behavior that we want, then RFC 8662 is not deployable. All that is needed is to clarify the (rather, self-evident) rules for SIDs = for which the originating routers effectively signal Implicit Null (expli= citly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared in= IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the BGP= -LU route. I do not think that I have missed anything (Binding SIDs are not involved i= n PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing = several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it = finds an [ELI, EL] pair at the top of the MPLS label stack, either when it = understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf = Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher = up in the stack to make sure that it is within readable depth for any LSR?"= my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not Bo= S to an existing standards-compliant MPLS forwarder, it will not know how t= o handle it since such handling has not ever been defined - not in RFC 5586= and not anywhere else. Stewart = has responded that "an old implementation that received a ToS GAL not at Bo= S would at best throw an exception or worst be unpredictable". Neither of = these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that pa= ckets with GAL in the middle of the stack only pass thru new LSRs that know= how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that immed= iately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the struc= tures that can be used for this purpose (as you have said, "we can carry ev= erything in the associated channel", including TLVs and Sub-TLVs, if necess= ary - it will be up to the specific applications to process such structures= in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogni= ze new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to = meddle with the information carried in the ACH (similar to what has been do= ne in RFC 8169) even if they cann= ot detect presence of GAL at BoS due to the depth of the stack. I cannot say whether this approach is good enough for the specific set of a= pplications. But it looks to me as reasonably safe since it does not requir= e any new forwarding functionality in existing LERs - primum non nocere. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart Bry= ant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make s= ure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for residence time measurement. Logically this means that we can carry everything in the associated channel= . However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffrey= (Zhaohui) Zhang > >; Alexander Vainshtein > >; St= ewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a while= . > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forwardi= ng. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model. > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A% > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2<= https://urldefense.com/v3/__https:/clicktime.symantec.com/3RHS3C2UW8kquG4WD= QJFwvp6H2?u=3Dhttps*3A*2F*2Furldefense.com*2Fv3*2F__https*3A*2Fclicktime.sy= mantec.com*2F3R52RdsrwRGTaBhuR2Sd5Qw6H2*3Fu*3Dhttps*2A3A*2A2F*2A2Furldefens= e.com*2A2Fv3*2A2F__https*2A3A*2A2Fclicktime.symantec.com*2A2F353Ka7ifLCb9e7= KAzjZ4fsf6H2*2A3Fu*2A3Dhttps*2A2A3A*2A2A252__*2A3BJSU*2A21*2A21NEt6yMaO-gk*= 2A21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMG_cybmA*2A24__*= 3BJSUlJSUlJSUlJSUlJSUlJSU*21*21NEt6yMaO-gk*21Uk8p6mR2CzJJFXxJuweTWC-0CDe7od= XjIzcOP6yLGVqs-46um02ro1mH2RXrzIw*24__;JSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSUl= JSUlJSU!!NEt6yMaO-gk!RH_x4Yy-jTEqPMKiyMGCocKS-X0kXu_C0ArR_wJSIAgx76WXM8Mm5x= SMct3koic$> > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB80814F29FDDF0626947729FCC7099BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Doh, RFC 5586 not RFC 5886

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> O= n Behalf Of John E Drake
Sent: Tuesday, June 22, 2021 10:06 AM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Hi,

 

Comments inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Tuesday, June 22, 2021 9:27 AM
To: John E Drake <jdrake@ju= niper.net>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

Lots of thanks for you= r comment.

 

A few points:

1. &nbs= p;      I have sent the previous email as a response to your aside clai= m that “RFC 8662 does not define what a transit LSR should do = when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the label pair or when it doe= sn't”. As I see it, both Bruno and I ha= ve demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere in= RFC 8662 do I see a statement of the form:  “This document upda= tes the transit LSR behavior defined in RFC 6790 to allow a transit LSR tha= t understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires a= transit LSR to indicate this capability to other LSRs in the SR domain and= it requires the ingress LSR to ensure that when it inserts [ELI, EL] pairs= in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with = this capability.”.

 

  1. My reading of your comment to my response “If that’s the behavior that we want, then RFC 8662 is no= t deployable” is that:
    1. You agree that some behavior has been defined in RFC 8662

 

[JD]  Your email, to which I responded, r= eferenced RFC 6790 not RFC 8662 and I was commenting on this sentence: = ; “Any other LSR (including PHP LSRs) MUST drop such packets.”.=   I.e., it is referring to non-egress, or transit, LSRs.  

 

    1. You claim that the defined behavior makes RFC 8662 non-deployable

 

[JD]  See my previous comment.=

 

  1. I respectfully disagree with (2b) above because:
    1. My reading of RFC 6790 is that {ELI, EL} pairs in any case can be only inse= rted if the node that receives ELI at the top of the stack has signaled its= capability to handle such a pair

 

[JD]   RFC 6970 only talks about egr= ess LSRs advertising this capability.

 

b.      While RFC 8662 does n= ot define any mechanisms for signaling ability to handle {ELI, EL} pair at = the top of the stack, it provides Informational references to a couple of d= rafts that define such signaling in IS-IS and OSPF, and these drafts have been already approved for publicatio= n as RFCs

 

[JD]  See my first comment above.

 

    1. With this signaling in place in an SR domain, {ELI, EL} pairs can be insert= ed in the label stack in the following positions:

  =             &nb= sp;            =             &nb= sp;            =       i.  = ;   = Immediately following an IGP Prefix SID that has been advertised (with PHP)= by a node that has signaled its capability to support {ELI, EL}=

 

[JD]  See my first comment above.  I= am not saying that RFC 8662 doesn’t work.  Rather, like RFC 588= 6 it is under-specified.

 

  =             &nb= sp;            =             &nb= sp;            =     ii. &nbs= p;   Immediately following an Adjacency SID that represents an IGP adjacency be= tween the advertising node and the node that signaled its capability to support {ELI, EL}

    1. Depending on specific network topology and the specific stack of SIDs, the = rules above may be too restrictive to provide effective load balancing, or = not. But IMHO and FWIW this is not really different from the situation with= “vanilla” RFC 6790 if, e.g., some of the PEs where a given L3VPN service is represented, have advertised the= ir ability to handle {ELI, EL} via LDP or RSVP-TE, and some did not adverti= se such capability.  

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Monday, June 21, 2021 9:56 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Monday, June 21, 2021 11:46 AM
To: John E Drake <jdrake@ju= niper.net>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

“Great minds thi= nk alike”.

 

Regarding your aside c= omment on RFC 8662:

The last para of Section 4.3 of RFC 6790 says:

 

   As stated in Sections 4.1 and 5, an egress LSR that signals =
both ELC
 &n=
bsp; and implicit null MUST pop the ELI and the next label (which shou=
ld
&nb=
sp;  be the EL), if it encounters a packet with the ELI as the topmost=

&nb=
sp;  label.  Any other LSR (including PHP LSRs) MUST drop such pa=
ckets, as
   per Section 3.18 of [RFC3031].
 
[JD]  If that’s the behavior that we want, then RFC =
8662 is not deployable.

 

All that is needed is = to clarify the (rather, self-evident) rules for SIDs for which the originat= ing routers  effectively signal Implicit Null  (explicitly or imp= licitly), including:

  1. All= Adj-SIDs
  2. All EPE SIDs
  3. IGP Prefix SIDs that have been advertised = with PHP (P-flag cleared in IS-IS, NP-flag cleared in OSPF)
    4. =
  4. BGP= Prefix SIDs advertised with Implicit Null in the NLRI of  the BGP-LU = route.

 

I do not think that I = have missed anything (Binding SIDs are not involved in PHP).

 

My 2c,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Monday, June 21, 2021 3:52 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

I agree with Sasha’s email, below, which is pr= oposing what I was proposing several months ago.

 

As an aside, RFC 8662 does not define what a transit= LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label= stack, either when it understands the label pair or when it doesn't.<= /o:p>

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Monday, June 21, 2021 6:55 AM
To: Loa Andersson <loa@pi.nu>=
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

Loa,

Regarding your question “Would you include = adding a copy of the GAL higher up in the stack to make sure that it is wit= hin readable depth for any LSR?”  my answer is NO.

 

I have already said on this thread that if GAL is= exposed as ToS but not BoS to an existing standards-compliant MPLS forward= er, it will not know how to handle it since such handling has not ever been= defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an ol= d implementation that received a ToS GAL not at BoS would at best throw an = exception or worst be unpredictable”.  Neither of these options = sounds optimistic to me.

 

I also do not favor investing into a technique th= at would guarantee that packets with GAL in the middle of the stack only pa= ss thru new LSRs that know how to handle them .

 

However, it is quite possible to do the following= IMHO:

  1. Retain the existi= ng definitions of GAL just at BoS and ACH that immediately follows the BoS<= o:p>
  2. De= fine new ACH types that can carry new ancillary data, and the structures th= at can be used for this purpose (as you have said, “we can carry ever= ything in the associated channel”, including TLVs and Sub-TLVs, if necessary – it will be up to the specific applications to process= such structures in ACH, but at least this would not affect MPLS forwarding= ).
  3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recognize ne= w ACH types to meddle with the information carried in the ACH while forward= ing labeled packets in the usual way
  4. Also allow usage of TTL to help LERs tha= t recognize new ACH types to meddle with the information carried in the ACH= (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the = depth of the stack.

 

I cannot say whether this approach is good enough= for the specific set of applications. But it looks to me as reasonably saf= e since it does not require any new forwarding functionality in existing LE= Rs - primum non nocere.

 

My 2c,

Sasha

 

Office: +972-39266302

Cell:      +972-54926630= 2

Email:   Alexander.Vainshtein@rbbn.com

 

 

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Sent: Monday, June 21, 2021 1:16 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (Zh= aohui) Zhang <z= zhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gmai= l.com>
Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS

 

Sasha,

 

 

On 21/06/2021 11:55, Alexander Vainshtein wrote:<= o:p>

> Loa and all,

>

> I fully agree with the proposal "to not= tamper with ACH anymore".

>

>  From my POV, this includes (by implica= tion) not tampering also with

> GAL as well.

 

Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR?=

>

> As for the question " If the slot immed= iately after the label stack is

> reserved for the ACH does this mean the no o= ther ancillary data may be

> inserted in this position, e.g. MPLS EH's, g= iven that there is a GAL

> in the stack" the answer, IMHO, is YES.=

>

> However, it is quite possible to carry any k= ind of new information in

> the ACH, similar to the way this has been do= ne in Section 3 of RFC

> 8169

> <https://clickti= me.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3Dhttps%3A%2F%2Fdatatracker.ie= tf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

 

Logically this means that we can carry everything= in the associated channel. However there can only one ACH per packet, righ= t?

 

/Loa

>

> Regards,

>

> Sasha

>

> Office: +972-39266302

>

> Cell:      +972-549= 266302

>

> Email:   Alexander.Vainshtein@= rbbn.com

>

> -----Original Message-----

> From: Loa Andersson <loa@pi.nu>

> Sent: Monday, June 21, 2021 12:40 PM

> To: Haoyu Song <hsong@f= uturewei.com>; Jeffrey (Zhaohui) Zhang

> <zzha= ng=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

> <Alexander.Va= inshtein@rbbn.com>; Stewart Bryant

> <stewart.bryant@gm= ail.com>

> Cc: mpls@ietf.org

> Subject: Re: [mpls] [EXTERNAL] Indicators in= the stack and ancillary

> data after the BoS

>

> Haoyu, DT

>

> On 17/06/2021 18:56, Haoyu Song wrote:<= /o:p>

>

>  > My opinion is to not tamper with = ACH anymore because it's designed

> for control channel only and so far for a sp= ecial scenario. The

> constraints on GAL and format of ACH are har= d to adapt to the new use

> case requirements.

>

>  >

>

> I think this is a position that is possible = to defend.

>

> One question though.

>

> RFC 5586 specifies "that the ACH appear= s immediately after the bottom

> of the label stack."

>

> If the slot immediately after the label stac= k is reserved for the ACH

> does this mean the no other ancillary data m= aybe inserted in this

> position, e.g. MPLS EH's, given that there i= s a GAL in the stack?

>

> /Loa

>

>  > Thanks!

>

>  > Haoyu

>

>  >

>

>  > -----Original Message-----

>

>  > From: mpls <mpls-bounces@ietf.org <mailto:mpls-b= ounces@ietf.org>>

> On Behalf Of Jeffrey (Zhaohui)

>

>  > Zhang

>

>  > Sent: Thursday, June 17, 2021 8:0= 2 AM

>

>  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Alexa= nder

> Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > Hi Loa,

>

>  >

>

>  >> but I'd like to see the DT ad= dress multiple indicators in the

> stack and multiple sets of ancillary data af= ter the BoS.

>

>  >

>

>  > I think the earlier emails of thi= s email thread were talking about

> multiple indicators in the stack; for multip= le set of ancillary data

> after the BoS, either the extended ACH or th= e proposed MPLS/generic

> extension headers or a merge of those propos= als should be able to

> handle it. This is alluded to the DataAfterB= OS wiki page.

>

>  >

>

>  > Thanks.

>

>  >

>

>  > Jeffrey

>

>  >

>

>  > -----Original Message-----

>

>  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

>

>  > Sent: Thursday, June 17, 2021 10:= 46 AM

>

>  > To: Jeffrey (Zhaohui) Zhang <z= zhang@juniper.net

> <mailto:zzhang@juniper.n= et>>; Alexander Vainshtein

>

>  > <Alexander.Vainshtein@rbbn.com=

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>; Stewart Bryant

>

>  > <stewart.bryant@gmail.com <mailto:stewart.= bryant@gmail.com>>

>

>  > Cc: mpls@ietf.org <mailto:mpls@ietf.org>

>

>  > Subject: Re: [mpls] [EXTERNAL] In= dicators in the stack and

> ancillary

>

>  > data after the BoS

>

>  >

>

>  > [External Email. Be cautious of c= ontent]

>

>  >

>

>  >

>

>  > DT,

>

>  >

>

>  > Responded to Jeffrey's mail, but = it is intended to address the

> entire discussion.

>

>  >

>

>  > There seem to be enough issues to= sort out around the GAL/ACH pair,

> and I was worried about a set of other indic= ators and the data that

> they might want to put "after the BoS&q= uot;. So far I have seen no real

> effort to address the interference's this mi= ght lead to.

>

>  >

>

>  > Further inline

>

>  >

>

>  >

>

>  > On 17/06/2021 16:15, Jeffrey (Zha= ohui) Zhang wrote:

>

>  >> Hi,

>

>  >>

>

>  >> It's not clear how we could p= ut a GAL not at a BoS:

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;     ACH       &nb= sp;            =          

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;            ACH= TLV Header          &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;            &nb= sp;            =

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;        zero or more ACH TLVs =             &nb= sp;      

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     = |            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           G-ACh Mes= sage            = ;            &n= bsp;

> ~

>

>  >>

>

>  >>     = ~            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            

> |

>

>  >>

>

>  >>

>

>  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+= -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

>

>  >>

>

>  >>     =             &nb= sp;       Figure 2: G-ACh Packet Payload=

>

>  >>

>

>  >> If the GAL does not have S-bi= t set, wouldn't a transit LSR treat

> any

>

>  >> 4-ocet field (i.e. those in t= he above Figure) after that GAL as a

>

>  >> label+TOS+S+TTL? If that 4-oc= tet field has the S-bit set, the

> transit

>

>  >> LSR will think the label stac= k ends there even though that's just

>

>  >> part of the ACH.

>

>  >>

>

>  >> Or are you saying that a GAL = not at the BoS will not have the ACH

>

>  >> following it?

>

>  >

>

>  > Well, as far as I understand a GA= L which does not have the NoS-bit

> set will have other labels after itself. The= BoS-bit will be found

> deeper down stack and the ACH will immediate= ly fo9llow the BoS.

>

>  >

>

>  > Yes there are issues here, but I'= d like to see the DT address

> multiple indicators in the stack and multipl= e sets of ancillary data

> after the BoS.

>

>  >

>

>  > I think we need to nail down the = relevant questiuons first, and

> start working on solutions after that.<= /o:p>

>

>  >

>

>  > /Loa

>

>  >>

>

>  >> Jeffrey

>

>  >>

>

>  >> *From:*mpls <mpls-bounces@ietf.org <mailto= :mpls-bounces@ietf.org>>

> *On Behalf Of *Alexander

>

>  >> Vainshtein

>

>  >> *Sent:* Thursday, June 17, 20= 21 5:07 AM

>

>  >> *To:* Stewart Bryant <stew= art.bryant@gmail.com

> <mailto:stewart.br= yant@gmail.com>>

>

>  >> *Cc:* mpls@ietf.o= rg <mailto:mpls@ietf.org>

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >> *[External Email. Be cautious= of content]*

>

>  >>

>

>  >> Stewart,

>

>  >>

>

>  >> I fully agree with your state= ment that "an old implementation that

>

>  >> received a ToS GAL not at BoS= would at best throw an exception or

>

>  >> worst be unpredictable".=

>

>  >>

>

>  >> Regarding your statement &quo= t;it is OK to have multiple GALs and GALs

> not

>

>  >> at BoS IFF the creator of the= LSP ensured that all LSRs on the

> LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly":

>

>  >>

>

>  >>   1. I fully agree = with this statement as a general restriction  2.

>

>  >> Quite a lot of things have to= be done in order to make this

>

>  >>     = restriction work including at least:

>

>  >>

>

>  >>     =   1. The definition of correct processing of GAL at ToS but

> not at

>

>  >>     =      BoS must be provided

>

>  >>     =   2. Advertisement of ability to process GAL not at BoS

> correctly in

>

>  >>     =      IGP and BGP must be defined

>

>  >>     =   3. Ability to set up network-wide paths that only cross

> nodes that

>

>  >>     =      process GAL correctly must be provided for differe= nt

> techniques

>

>  >>     =      (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)=

>

>  >>

>

>  >> It is still possible that, af= ter all this work, we shall find out

>

>  >> that the benefits of supporti= ng GAL at ToS but not BoS will be

> only

>

>  >> available in the networks whe= re all the nodes support the new

>

>  >> functionality because presenc= e of non-supporting nodes imposes too

>

>  >> many restrictions on connecti= vity and/or resilience.

>

>  >>

>

>  >> Regards,

>

>  >>

>

>  >> Sasha

>

>  >>

>

>  >> Office: +972-39266302

>

>  >>

>

>  >> Cell:    =   +972-549266302

>

>  >>

>

>  >> Email: Alexander.Vainshtein@= rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>

>

>  >>

>

>  >> *From:*Stewart Bryant <ste= wart.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>

>

>  >> *Sent:* Thursday, June 17, 20= 21 10:36 AM

>

>  >> *To:* Alexander Vainshtein &l= t;Alexander.Vainshtein@rbbn.com

>

>  >> <mailto:Alexander.Vainshte= in@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>>

>

>  >> *Cc:* Stewart Bryant <stew= art.bryant@gmail.com

>

>  >> <mailto:stewart.bryant@gma= il.com

> <mailto:stewart.br= yant@gmail.com>>>; gregory.mirsky@ztetx.com

> <mailto:gregory.mi= rsky@ztetx.com>

>

>  >> <mailto:gregory.mirsky@zte= tx.com

> <mailto:gregory.mi= rsky@ztetx.com>>;

> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>&g= t;

>

>  >> *Subject:* Re: [mpls] [EXTERN= AL] Indicators in the stack and

>

>  >> ancillary data after the BoS<= o:p>

>

>  >>

>

>  >>     = On 17 Jun 2021, at 07:45, Alexander Vainshtein

>

>  >>     = <Alexander.Vainshtein@rbbn.com

>

>  >>     = <mailto:Alexander.Vainshtein@rbbn.com

> <mailto:Alexa= nder.Vainshtein@rbbn.com>>> wrote:

>

>  >>

>

>  >>     = While that might be the case, I think that the Open DT may

> give it a

>

>  >>     = try and investigate how the existing systems will handle GAL

> being

>

>  >>     = not the BoS label.

>

>  >>

>

>  >>     = */[[Sasha]] Great minds think alike! One useful step could be

>

>  >>     = collecting the known actual behavior of popular

> implementations in

>

>  >>     = this case, say, by running a survey among the vendors - what

> do you

>

>  >>     = think?/*

>

>  >>

>

>  >> That is actually a considerab= le amount of work that will take a while.

>

>  >>

>

>  >> It seems to me that an old im= plementation that received a ToS GAL

> not

>

>  >> at BoS would at best throw an= exception or worst be unpredictable.

>

>  >>

>

>  >> The original assumed processi= ng model is to take the context of

> the

>

>  >> PW label or PW+FAT label, dis= cover the GAL and then process the

> GAL

>

>  >> in the context of the PW labe= l.

>

>  >>

>

>  >> When we extended GAL to apply= to LSPs we again had the model that

> the

>

>  >> GAL operated in the context o= f the LSP label that preceded it for

>

>  >> context. It was still BoS.

>

>  >>

>

>  >> Putting the GAL further up th= e stack is a new behaviour.

>

>  >>

>

>  >> If it arrives at an LSR that = knows the new semantic all is good.

>

>  >>

>

>  >> If it arrives at an LSR that = does not know the new semantic then

>

>  >>

>

>  >> a) An error has occurred eith= er in setting up the LSP, or in forwarding.

>

>  >>

>

>  >> b) The behaviour at the recei= ving node is unpredictable, but in

> any

>

>  >> well written implementation s= hould just result in the packet being

>

>  >> dropped and counted as with a= ny other Mal-formed packet.

>

>  >>

>

>  >> So I would think that it is O= K to have multiple GALs and GALs not

> at

>

>  >> BoS IFF the creator of the LS= P ensured that all LSRs on the LSP,

>

>  >> including ECMP and FRR paths = that found the GAL at ToS were known

> to

>

>  >> be able to process it correct= ly.

>

>  >>

>

>  >> A GAL not at BoS and not at T= oS should not be inspected or

> processed

>

>  >> by any LSR that did not know = what it was doing, and to attempt to

>

>  >> precess it would be a violati= on of the normal MPLS processing model.

>

>  >>

>

>  >> - Stewart

>

>  >>

>

>  >>

>

>  >> Notice: This e-mail together = with any attachments may contain

>

>  >> information of Ribbon Communi= cations Inc. and its Affiliates that

> is

>

>  >> confidential and/or proprieta= ry for the sole use of the intended

>

>  >> recipient. Any review, disclo= sure, reliance or distribution by

> others

>

>  >> or forwarding without express= permission is strictly prohibited.

> If

>

>  >> you are not the intended reci= pient, please notify the sender

>

>  >> immediately and then delete a= ll copies, including any attachments.

>

>  >>

>

>  >>

>

>  >> Juniper Business Use Only

>

>  >>

>

>  >>

>

>  >> _____________________________= __________________

>

>  >> mpls mailing list<= /p>

>

>  >> mpls@ietf.org <mailto:mpls@ietf.org>

>

>  >>

> https://clicktime.sym= antec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

> <https://clicktime.symantec.com/32ELHVPxd= Ze1NeGCU5oipbG6H2?u=3Dhttps%3A%

> 25>

>

>  >>

> 2F%2Fnam11.safelinks.protection.outlook.com%= 2F%3Furl%3Dhttps%253A%252

>

>  >> F%252Furld

>

>  >>

> efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.o= rg%2Fmailman%2Flistinfo%2

>

>  >> F

>

>  >>

> mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob= 1JglFKOP6qKkgAcCSPbeBMMj2

>

>  >> A

>

>  >>

> nexFnPevXopeK1a6u%24&amp;data=3D04%7C01%= 7Chsong%40futurewei.com%7Ccc49d

>

>  >> e

>

>  >>

> 9585a24092e29708d931a0e327%7C0fee8ff2a3b2401= 89c753a1d5591fedc%7C1%7C0

>

>  >> %

>

>  >>

> 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d= 8eyJWIjoiMC4wLjAwMDAiLCJQ

>

>  >> I

>

>  >>

> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C= 1000&amp;sdata=3D5et4Juc3Ij

>

>  >> G

>

>  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F= 6h34Q%3D&amp;reserved=3D0

>

>  >>

>

>  >

>

>  > --

>

>  >

>

>  > Loa Andersson   &n= bsp;            = ;        email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

>  > Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

>  > Bronze Dragon Consulting &nb= sp;           phone: +46 = 739 81 21 64

>

>  >

>

>  > Juniper Business Use Only

>

>  > _________________________________= ______________

>

>  > mpls mailing list

>

>  > = mpls@ietf.org<= /a> <mailto:mpls@ietf.org>

>

>  >

> https://clicktime.sym= antec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2

> <https://clicktime.symantec.com/353Ka7ifL= Cb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%

> 252>

>

>  >

> F%2Fnam11.safelinks.protection.outlook.com%2= F%3Furl%3Dhttps%253A%252F%

>

>  >

> 252Fwww.ietf.org%252Fmailman%252Flistinfo%25= 2Fmpls%26data%3D04%257C01%

>

>  >

> 257Chsong%2540futurewei.com%257Ccc49de9585a2= 4092e29708d931a0e327%257C0

>

>  >

> fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%= 257C637595389337881384%257

>

>  >

> CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA= iLCJQIjoiV2luMzIiLCJBTiI6I

>

>  >

> k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DX= QlRpwkgODLRxcIjyMYyPMiCF2K

>

>  > DC0Y7GG4O8VGESnw%253D%26reserved%= 3D0

>

>  >

>

> --

>

> Loa Andersson     &= nbsp;           &nbs= p;      email: loa@pi.nu =

> <mailto:loa@pi.nu><= o:p>

>

> Senior MPLS Expert loa.pi.nu@gmail.com <mailto:loa.pi.nu@gmail.com>

>

> Bronze Dragon Consulting   &n= bsp;         phone: +46 739 81 21 6= 4

>

>

> Notice: This e-mail together with any attach= ments may contain

> information of Ribbon Communications Inc. an= d its Affiliates that is

> confidential and/or proprietary for the sole= use of the intended

> recipient. Any review, disclosure, reliance = or distribution by others

> or forwarding without express permission is = strictly prohibited. If

> you are not the intended recipient, please n= otify the sender

> immediately and then delete all copies, incl= uding any attachments.

 

--

 

Loa Andersson      =              &n= bsp;    email: loa@pi.nu<= o:p>

Senior MPLS Expert     &= nbsp;           &nbs= p;        loa.pi.nu@gmail.com

Bronze Dragon Consulting    &= nbsp;        phone: +46 739 81 21 64


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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Tue, 22 Jun 2021 15:01:36 +0000 Received: from MW4PR03MB6395.namprd03.prod.outlook.com ([fe80::42d:520b:ac94:ab62]) by MW4PR03MB6395.namprd03.prod.outlook.com ([fe80::42d:520b:ac94:ab62%7]) with mapi id 15.20.4195.030; Tue, 22 Jun 2021 15:01:35 +0000 From: Alexander Vainshtein To: John E Drake CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Loa Andersson Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0tvWXYojRPFIEm2oOWwKl8E8KsX5L3ggABbPICAAAh/AIAABEIAgAAgBoCABc90gIAAAKsggAAJYgCAAAFUIIAAKigAgAAFe6CAAGBaAIABL2cggAARzwCAAAoTcA== Date: Tue, 22 Jun 2021 15:01:35 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [109.67.43.220] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: c0351abc-9a55-412a-4aa2-08d9358ea172 x-ms-traffictypediagnostic: CO2PR03MB2278: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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boundary="_000_MW4PR03MB63952599D725AD5717547F3AF6099MW4PR03MB6395namp_" MIME-Version: 1.0 X-OriginatorOrg: rbbn.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MW4PR03MB6395.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c0351abc-9a55-412a-4aa2-08d9358ea172 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jun 2021 15:01:35.8093 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 29a671dc-ed7e-4a54-b1e5-8da1eb495dc3 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /5Q6xc7XJ9eIaBlB4b2NokW9ua5lqrEmjh/imKpu2d0IKDlZ6yKBVf7eJlsf378mL+AB8P9K2PxS2KrLFu5+qA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO2PR03MB2278 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 15:01:57 -0000 --_000_MW4PR03MB63952599D725AD5717547F3AF6099MW4PR03MB6395namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable John, Again, lots of thanks for your comments. Please see inline below. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake Sent: Tuesday, June 22, 2021 5:06 PM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zha= ng ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Hi, Comments inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Tuesday, June 22, 2021 9:27 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Ande= rsson > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] John, Lots of thanks for your comment. A few points: 1. I have sent the previous email as a response to your aside clai= m that "RFC 8662 does not define what a transit LSR should do when it find= s an [ELI, EL] pair at the top of the MPLS label stack, either when it und= erstands the label pair or when it doesn't". As I see it, both Bruno and I= have demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of= the form: "This document updates the transit LSR behavior defined in RFC= 6790 to allow a transit LSR that understands entropy labels to remove an = [ELI, EL] pair that it sees at the top of an MPLS label stack. This requi= res a transit LSR to indicate this capability to other LSRs in the SR doma= in and it requires the ingress LSR to ensure that when it inserts [ELI, EL= ] pairs in the MPLS label stack they will only be at the top of the MPLS l= abel stack when received by a transit LSR with this capability." [[Sasha]] I have not seen any such statement either. However, I think that= we may be dealing with a terminology issue. I believe that in SR a node t= hat originates advertisement, say, of an IGP Prefix SID, is considered as = the egress node for the segment represented by this SID, even if it is a t= ransit node for an LSP that includes this SID in the middle of the stack o= f SIDs. This is why they have assumed that considerations of 6790 pertaini= ng to egress LERs are sufficient. 1. My reading of your comment to my response "If that's the behavior th= at we want, then RFC 8662 is not deployable" is that: * You agree that some behavior has been defined in RFC 8662 [JD] Your email, to which I responded, referenced RFC 6790 not RFC 8662 a= nd I was commenting on this sentence: "Any other LSR (including PHP LSRs)= MUST drop such packets.". I.e., it is referring to=20non-egress, or tran= sit, LSRs. [[Sasha]] Please see my previous comment * You claim that the defined behavior makes RFC 8662 non-deployable= [JD] See my previous comment. 1. I respectfully disagree with (2b) above because: * My reading of RFC 6790 is that {ELI, EL} pairs in any case can be= only inserted if the node that receives ELI at the top of the stack has s= ignaled its capability to handle such a pair [JD] RFC 6970 only talks about egress LSRs advertising this capability.[= [Sasha]] Please see my previous comment about terminology. Please note als= o that the signaling drafts I have mentioned, define signaling of Entropy = Label Capability (ELC) by all router. In particular, the Signaling Entropy= Label Capability and Entropy Readable Label Depth Using ISIS draft says: Bit 3 in the Prefix Attribute Flags [RFC7794] is used as the ELC Flag (E-flag), as shown in Figure 1. If a router has multiple interfaces, the router MUST NOT announce the ELC for any local host prefixes unless all of its interfaces are capable of processing ELs. If a router supports ELs on all of its interfaces, it SHOULD set the ELC for every local host prefix it advertises in IS-IS. >From my POV, this specification means that the {ELI, EL} tuple may be safe= ly inserted into the label stack immediately after any IGP Prefix SID adve= rtised with PHP by a router that has also advertised ELC capability in IS-= IS. b. While RFC 8662 does not define any mechanisms for signaling abili= ty to handle {ELI, EL} pair at the top of the stack, it provides Informati= onal references to a couple of drafts that define such signaling in IS-IS = and OSPF, and these drafts have been already approved for publication as R= FCs [JD] See my first comment above. * With this signaling in place in an SR domain, {ELI, EL} pairs can= be inserted in the label stack in the following positions: =20 i. = Immediately following an IGP Prefix SID that has been advertised (with P= HP) by a node that has signaled its capability to support {ELI, EL} [JD] See my first comment above. I am not saying that RFC 8662 doesn't w= ork. Rather, like RFC 5886 it is under-specified. [[Sasha]] From my POV, the above-mentioned signaling drafts provide the mi= ssing specification. This is quite different from RFC 5586. ii. I= mmediately following an Adjacency SID that represents an IGP adjacency bet= ween the advertising node and the node that signaled its capability to sup= port {ELI, EL} * Depending on specific network topology and the specific stack of = SIDs, the rules above may be too restrictive to provide effective load bal= ancing, or not. But IMHO and FWIW this is not really different from the si= tuation with "vanilla" RFC 6790 if, e.g., some of the PEs where a given L3= VPN service is represented, have advertised their ability to handle {ELI, = EL} via LDP or RSVP-TE, and some did not advertise such capability. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 9:56 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Ande= rsson > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Comment inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein > Sent: Monday, June 21, 2021 11:46 AM To: John E Drake > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Ande= rsson > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] John, "Great minds think alike". Regarding your aside comment on RFC 8662: The last para of Section 4.3 of RFC 6790 says: As stated in Sections 4.1 and 5, an egress LSR that signals both ELC and implicit null MUST pop the ELI and the next label (which should be the EL), if it encounters a packet with the ELI as the topmost label. Any other LSR (including PHP LSRs) MUST drop such packets, as per Section 3.18 of [RFC3031]. [JD] If that's the behavior that we want, then RFC 8662 is not deployable= . All that is needed is to clarify the (rather, self-evident) rules for SIDs= for which the originating routers effectively signal Implicit Null (exp= licitly or implicitly), including: 1. All Adj-SIDs 2. All EPE SIDs 3. IGP Prefix SIDs that have been advertised with PHP (P-flag cleared i= n IS-IS, NP-flag cleared in OSPF) 4. BGP Prefix SIDs advertised with Implicit Null in the NLRI of the BG= P-LU route. I do not think that I have missed anything (Binding SIDs are not involved = in PHP). My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Monday, June 21, 2021 3:52 PM To: Alexander Vainshtein >; Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Hi, I agree with Sasha's email, below, which is proposing what I was proposing= several months ago. As an aside, RFC 8662 does not define what a transit LSR should do when it= finds an [ELI, EL] pair at the top of the MPLS label stack, either when i= t understands the label pair or when it doesn't. Yours Irrespectively, John Juniper Business Use Only From: mpls > On Behalf= Of Alexander Vainshtein Sent: Monday, June 21, 2021 6:55 AM To: Loa Andersson > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS [External Email. Be cautious of content] Loa, Regarding your question "Would you include adding a copy of the GAL higher= up in the stack to make sure that it is within readable depth for any LSR= ?" my answer is NO. I have already said on this thread that if GAL is exposed as ToS but not B= oS to an existing standards-compliant MPLS forwarder, it will not know how= to handle it since such handling has not ever been defined - not in RFC 5= 586 and not anywhere = else. Stewart has responded that "an old implementation that received a To= S GAL not at BoS would at best throw an exception or worst be unpredictabl= e". Neither of these options sounds optimistic to me. I also do not favor investing into a technique that would guarantee that p= ackets with GAL in the middle of the stack only pass thru new LSRs that kn= ow how to handle them . However, it is quite possible to do the following IMHO: 1. Retain the existing definitions of GAL just at BoS and ACH that imme= diately follows the BoS 2. Define new ACH types that can carry new ancillary data, and the stru= ctures that can be used for this purpose (as you have said, "we can carry = everything in the associated channel", including TLVs and Sub-TLVs, if nec= essary - it will be up to the specific applications to process such struct= ures in ACH, but at least this would not affect MPLS forwarding). 3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogn= ize new ACH types to meddle with the information carried in the ACH while = forwarding labeled packets in the usual way 4. Also allow usage of TTL to help LERs that recognize new ACH types to= meddle with the information carried in the ACH (similar to what has been = done in RFC 8169) even= if they cannot detect presence of GAL at BoS due to the depth of the stac= k. I cannot say whether this approach is good enough for the specific set of = applications. But it looks to me as reasonably safe since it does not requ= ire any new forwarding functionality in existing LERs - primum non nocere<= https://clicktime.symantec.com/3GKsCwGpjw974kU3D48QDJb6H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fclicktime.symantec.com%2F3QMnW2BUztof= okYXW2fRkBn6H2%3Fu%3Dhttps%2A3A%2A2F%2A2Furldefense.com%2A2Fv3%2A2F__https= %2A3A%2A2Fclicktime.symantec.com%2A2F3GdXcZMxHHLvCC23kWNFkFG6H2%2A3Fu%2A3D= https%2A2A3A%2A2A2F%2A2A2Furldefense.com%2A2A2Fv3%2A2A2F__https%2A2A3A%2A2= A2Fen.wikipedia.org%2A2A2Fwiki%2A2A2FPrimum_non_nocere__%2A2A3B%2A2A21%2A2= A21NEt6yMaO-gk%2A2A21QiStnftbs7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vS= HtMI1UZKH0%2A2A24__%2A3BJSUlJSUlJSUlJSUlJSU%2A21%2A21NEt6yMaO-gk%2A21Uk8p6= mR2CzJJFXxJuweTWC-0CDe7odXjIzcOP6yLGVqs-46um02ro1mHSI9qHKg%2A24__%3BJSUlJS= UlJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU%21%21NEt6yMaO-gk%21RH_x4Yy-jTEqPMKiyMGCo= cKS-X0kXu_C0ArR_wJSIAgx76WXM8Mm5xSMA9liAC0%24>. My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com -----Original Message----- From: Loa Andersson > Sent: Monday, June 21, 2021 1:16 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Stewart = Bryant > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Sasha, On 21/06/2021 11:55, Alexander Vainshtein wrote: > Loa and=20all, > > I fully agree with the proposal "to not tamper with ACH anymore". > > From my POV, this includes (by implication) not tampering also with > GAL as well. Would you include adding a copy of the GAL higher up in the stack to make = sure that it is within readable depth for any LSR? > > As for the question " If the slot immediately after the label stack is > reserved for the ACH does this mean the no other ancillary data may be > inserted in this position, e.g. MPLS EH's, given that there is a GAL > in the stack" the answer, IMHO, is YES. > > However, it is quite possible to carry any kind of new information in > the ACH, similar to the way this has been done in Section 3 of RFC > 8169 > > where G-ACH is used for r= esidence time measurement. Logically this means that we can carry everything in the associated channe= l. However there can only one ACH per packet, right? /Loa > > Regards, > > Sasha > > Office: +972-39266302 > > Cell: +972-549266302 > > Email: Alexander.Vainshtein@rbbn.com > > -----Original Message----- > From: Loa Andersson > > Sent: Monday, June 21, 2021 12:40 PM > To: Haoyu Song >; Jeffre= y (Zhaohui) Zhang > >; Alexander Vainshtein > >; S= tewart Bryant > > > Cc: mpls@ietf.org > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary > data after the BoS > > Haoyu, DT > > On 17/06/2021 18:56, Haoyu Song wrote: > > > My opinion is to not tamper with ACH anymore because it's designed > for control channel only and so far for a special scenario. The > constraints on GAL and format of ACH are hard to adapt to the new use > case requirements. > > > > > I think this is a position that is possible to defend. > > One question though. > > RFC 5586 specifies "that the ACH appears immediately after the bottom > of the label stack." > > If the slot immediately after the label stack is reserved for the ACH > does this mean the no other ancillary data maybe inserted in this > position, e.g. MPLS EH's, given that there is a GAL in the stack? > > /Loa > > > Thanks! > > > Haoyu > > > > > > -----Original Message----- > > > From: mpls >> > On Behalf Of Jeffrey (Zhaohui) > > > Zhang > > > Sent: Thursday, June 17, 2021 8:02 AM > > > To: Loa Andersson >>; Alexander > Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > Hi Loa, > > > > > >> but I'd like to see the DT address multiple indicators in the > stack and multiple sets of ancillary data after the BoS. > > > > > > I think the earlier emails of this email thread were talking about > multiple indicators in the stack; for multiple set of ancillary data > after the BoS, either the extended ACH or the proposed MPLS/generic > extension headers or a merge of those proposals should be able to > handle it. This is alluded to the DataAfterBOS wiki page. > > > > > > Thanks. > > > > > > Jeffrey > > > > > > -----Original Message----- > > > From: Loa Andersson >> > > > Sent: Thursday, June 17, 2021 10:46 AM > > > To: Jeffrey (Zhaohui) Zhang >; Alexander Vainshtein > > > >; Stewart Bryant > > > >> > > > Cc: mpls@ietf.org > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > ancillary > > > data after the BoS > > > > > > [External Email. Be cautious of content] > > > > > > > > > DT, > > > > > > Responded to Jeffrey's mail, but it is intended to address the > entire discussion. > > > > > > There seem to be enough issues to sort out around the GAL/ACH pair, > and I was worried about a set of other indicators and the data that > they might want to put "after the BoS". So far I have seen no real > effort to address the interference's this might lead to. > > > > > > Further inline > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > >> Hi, > > >> > > >> It's not clear how we could put a GAL not at a BoS: > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | ACH TLV Header > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ zero or more ACH TLVs > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> | > ~ > > >> > > >> ~ G-ACh Message > ~ > > >> > > >> ~ > | > > >> > > >> > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > >> > > >> Figure 2: G-ACh Packet Payload > > >> > > >> If the GAL does not have S-bit set, wouldn't a transit LSR treat > any > > >> 4-ocet field (i.e. those in the above Figure) after that GAL as a > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > transit > > >> LSR will think the label stack ends there even though that's just > > >> part of the ACH. > > >> > > >> Or are you saying that a GAL not at the BoS will not have the ACH > > >> following it? > > > > > > Well, as far as I understand a GAL which does not have the NoS-bit > set will have other labels after itself. The BoS-bit will be found > deeper down stack and the ACH will immediately fo9llow the BoS. > > > > > > Yes there are issues here, but I'd like to see the DT address > multiple indicators in the stack and multiple sets of ancillary data > after the BoS. > > > > > > I think we need to nail down the relevant questiuons first, and > start working on solutions after that. > > > > > > /Loa > > >> > > >> Jeffrey > > >> > > >> *From:*mpls >> > *On Behalf Of *Alexander > > >> Vainshtein > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> *[External Email. Be cautious of content]* > > >> > > >> Stewart, > > >> > > >> I fully agree with your statement that "an old implementation that > > >> received a ToS GAL not at BoS would at best throw an exception or > > >> worst be unpredictable". > > >> > > >> Regarding your statement "it is OK to have multiple GALs and GALs > not > > >> at BoS IFF the creator of the LSP ensured that all LSRs on the > LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly": > > >> > > >> 1. I fully agree with this statement as a general restriction 2. > > >> Quite a lot of things have to be done in order to make this > > >> restriction work including at least: > > >> > > >> 1. The definition of correct processing of GAL at ToS but > not at > > >> BoS must be provided > > >> 2. Advertisement of ability to process GAL not at BoS > correctly in > > >> IGP and BGP must be defined > > >> 3. Ability to set up network-wide paths that only cross > nodes that > > >> process GAL correctly must be provided for different > techniques > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > >> > > >> It is still possible that, after all this work, we shall find out > > >> that the benefits of supporting GAL at ToS but not BoS will be > only > > >> available in the networks where all the nodes support the new > > >> functionality because presence of non-supporting nodes imposes too > > >> many restrictions on connectivity and/or resilience. > > >> > > >> Regards, > > >> > > >> Sasha > > >> > > >> Office: +972-39266302 > > >> > > >> Cell: +972-549266302 > > >> > > >> Email: Alexander.Vainshtein@rbbn.com > > > >> > > > >> > > >> *From:*Stewart Bryant > >> >> > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > >> *To:* Alexander Vainshtein > >> >> > > >> *Cc:* Stewart Bryant > >> >>; gregory.mirsky@ztetx.com > > > >> >; > mpls@ietf.org > > >> >> > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > >> ancillary data after the BoS > > >> > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > >> > >> >> wrote: > > >> > > >> While that might be the case, I think that the Open DT may > give it a > > >> try and investigate how the existing systems will handle GAL > being > > >> not=20the BoS label. > > >> > > >> */[[Sasha]] Great minds think alike! One useful step could be > > >> collecting the known actual behavior of popular > implementations in > > >> this case, say, by running a survey among the vendors - what > do you > > >> think?/* > > >> > > >> That is actually a considerable amount of work that will take a whil= e. > > >> > > >> It seems to me that an old implementation that received a ToS GAL > not > > >> at BoS would at best throw an exception or worst be unpredictable. > > >> > > >> The original assumed processing model is to take the context of > the > > >> PW label or PW+FAT label, discover the GAL and then process the > GAL > > >> in the context of the PW label. > > >> > > >> When we extended GAL to apply to LSPs we again had the model that > the > > >> GAL operated in the context of the LSP label that preceded it for > > >> context. It was still BoS. > > >> > > >> Putting the GAL further up the stack is a new behaviour. > > >> > > >> If it arrives at an LSR that knows the new semantic all is good. > > >> > > >> If it arrives at an LSR that does not know the new semantic then > > >> > > >> a) An error has occurred either in setting up the LSP, or in forward= ing. > > >> > > >> b) The behaviour at the receiving node is unpredictable, but in > any > > >> well written implementation should just result in the packet being > > >> dropped and counted as with any other Mal-formed packet. > > >> > > >> So I would think that it is OK to have multiple GALs and GALs not > at > > >> BoS IFF the creator of the LSP ensured that all LSRs on the LSP, > > >> including ECMP and FRR paths that found the GAL at ToS were known > to > > >> be able to process it correctly. > > >> > > >> A GAL not at BoS and not at ToS should not be inspected or > processed > > >> by any LSR that did not know what it was doing, and to attempt to > > >> precess it would be a violation of the normal MPLS processing model.= > > >> > > >> - Stewart > > >> > > >> > > >> Notice: This e-mail together with any attachments may contain > > >> information of Ribbon Communications Inc. and its Affiliates that > is > > >> confidential and/or proprietary for the sole use of the intended > > >> recipient. Any review, disclosure, reliance or distribution by > others > > >> or forwarding without express permission is strictly prohibited. > If > > >> you are not the intended recipient, please notify the sender > > >> immediately and then delete all copies, including any attachments. > > >> > > >> > > >> Juniper Business Use Only > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > https://clicktime.symantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= https://clicktime.symantec.com/3AgFeqrtXP4t1gnnks7D75x6H2?u=3Dhttps%3A%2F%= 2Furldefense.com%2Fv3%2F__https%3A%2Fclicktime.symantec.com%2F3LbDZkybzjLK= by6DAk88iUh6H2%3Fu%3Dhttps%2A3A%2A2F%2A2Furldefense.com%2A2Fv3%2A2F__https= %2A3A%2A2Fclicktime.symantec.com%2A2F3G18FNxso3yysVeGE2oYas86H2%2A3Fu%2A3D= https%2A2A3A%2A2A2F%2A2A2Furldefense.com%2A2A2Fv3%2A2A2F__https%2A2A3A%2A2= A2Fclicktime.symantec.com%2A2A2F32ELHVPxdZe1NeGCU5oipbG6H2%2A2A3Fu%2A2A3Dh= ttps%2A2A2A3A%2A2A2A25__%2A2A3BJSU%2A2A21%2A2A21NEt6yMaO-gk%2A2A21QiStnftb= s7rzJ6JZRtxhV6LZks_wNvQJ-rNe5phnYEW6lEzzVD0vSHtMnORLvEs%2A2A24__%2A3BJSUlJ= SUlJSUlJSUlJSUlJSU%2A21%2A21NEt6yMaO-gk%2A21Uk8p6mR2CzJJFXxJuweTWC-0CDe7od= XjIzcOP6yLGVqs-46um02ro1mHiE0sPVM%2A24__%3BJSUlJSUlJSUlJSUlJSUlJSUlJSUlJSU= lJSUlJSUlJSU%21%21NEt6yMaO-gk%21RH_x4Yy-jTEqPMKiyMGCocKS-X0kXu_C0ArR_wJSIA= gx76WXM8Mm5xSMg35ivIo%24> > 25> > > >> > 2F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252 > > >> F%252Furld > > >> > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2 > > >> F > > >> > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8ob1JglFKOP6qKkgAcCSPbeBMMj2 > > >> A > > >> > nexFnPevXopeK1a6u%24&data=3D04%7C01%7Chsong%40futurewei.com%7Ccc49d > > >> e > > >> > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > > >> % > > >> > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ > > >> I > > >> > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D5et4Juc3Ij > > >> G > > >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3F6h34Q%3D&reserved=3D0 > > >> > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > Juniper Business Use Only > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > > https://clicktime.symantec.com/353Ka7ifLCb9e7KAzjZ4fsf6H2?u=3Dhttps%3A%2= > 252> > > > > F%2Fnam11.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F% > > > > 252Fwww.ietf.org%252Fmailman%252Flistinfo%252Fmpls%26data%3D04%257C01% > > > > 257Chsong%2540futurewei.com%257Ccc49de9585a24092e29708d931a0e327%257C0 > > > > fee8ff2a3b240189c753a1d5591fedc%257C1%257C0%257C637595389337881384%257 > > > > CUnknown%257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I > > > > k1haWwiLCJXVCI6Mn0%253D%257C1000%26sdata%3DXQlRpwkgODLRxcIjyMYyPMiCF2K > > > DC0Y7GG4O8VGESnw%253D%26reserved%3D0 > > > > > -- > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > Notice: This e-mail together with any attachments may contain > information of Ribbon Communications Inc. and its Affiliates that is > confidential=20and/or proprietary for the sole use of the intended > recipient. Any review, disclosure, reliance or distribution by others > or forwarding without express permission is strictly prohibited. If > you are not the intended recipient, please notify the sender > immediately and then delete all copies, including any attachments. -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. --_000_MW4PR03MB63952599D725AD5717547F3AF6099MW4PR03MB6395namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

John,

Again, lots of thanks= for your comments.

 

Please see = inline below.

 

Regards,

Sasha

 

Office: +972-39266302=

Cell:  &nbs= p;   +972-549266302

Email:   Al= exander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>= ;
Sent: Tuesday, June 22, 2021 5:06 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey = (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Anderss= on <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

Hi,

 

Comments inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Sent: Tuesday, June 22, 2021 9:27 AM
To: John E Drake <jdrake@j= uniper.net>
Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

= [External Em= ail. Be cautious of content]

 

John,

Lots of thanks for yo= ur comment.

 

A few points:

1. &n= bsp;       I have sent the previous email as a = response to your aside claim that “RFC 8662 does not define w= hat a transit LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the l= abel pair or when it doesn't”. As I se= e it, both Bruno and I have demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere i= n RFC 8662 do I see a statement of the form:  “This document up= dates the transit LSR behavior defined in RFC 6790 to allow a transit LSR = that understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires = a transit LSR to indicate this capability to other LSRs in the SR domain a= nd it requires the ingress LSR to ensure that when it inserts [ELI, EL] pa= irs in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with= this capability.”

[[Sasha]] I hav= e not seen any such statement either. However, I think that we may be deal= ing with a terminology issue. I believe that in SR a node that originates = advertisement, say, of an IGP Prefix SID, is considered as the egress node for the segment represented by this S= ID, even if it is a transit node for an LSP that includes this SID in the middle of the stack of SIDs. This is why they have assumed that considerations of 6790 pertaining to= egress LERs are sufficient.

 

  1. My= reading of your comment to my response “If that’s the behavior that we want, then RFC 8662 is no= t deployable” is that:
    1. Yo= u agree that some behavior has been defined in RFC 8662

     

    [JD]  Your email, to which I responded, = referenced RFC 6790 not RFC 8662 and I was commenting on this sentence:&nb= sp; “Any other LSR (including PHP LSRs) MUST drop such packets.̶= 1;.  I.e., it is referring to non-egress, or transit, LSRs.  [[Sasha]] Please see my previous comm= ent

     

      1. Yo= u claim that the defined behavior makes RFC 8662 non-deployable=

     

    [JD]  See my previous comment.

     

    1. I = respectfully disagree with (2b) above because:
      1. = My reading of RFC 6790 is that {ELI, EL} pairs in any case can be only ins= erted if the node that receives ELI at the top of the stack has signaled i= ts capability to handle such a pair

     

    [JD]   RFC 6970 only talks about eg= ress LSRs advertising this capability.[[Sash= a]] Please see my previous comment about terminology. Please note also tha= t the signaling drafts I have mentioned, define signaling of Entropy Label Capability (ELC) by all router. In particular, the Signaling Entropy Label Capability and Entro= py Readable Label Depth Using ISIS draft says:

       Bit 3 in the Prefix Attribut=
e Flags [RFC7794] is used as the ELC Flag
       (E-flag), as shown in Figure=
 1.  If a router has multiple interfaces,
       the router MUST NOT announce=
 the ELC for any local host prefixes
       unless all of its interfaces=
 are capable of processing ELs.  If a
       router supports ELs on all o=
f its interfaces, it SHOULD set the ELC
       for every local host prefix =
it advertises in IS-IS.

    From my POV, th= is specification means that the {ELI, EL} tuple may be safely inserted int= o the label stack immediately after any IGP Prefix SID advertised with PHP= by a router that has also advertised ELC capability in IS-IS.

     

    b.       While RFC 8662 does not define any mechanisms for signaling ability t= o handle {ELI, EL} pair at the top of the stack, it provides Informational= references to a couple of drafts that define such signaling in IS-IS and OSPF, and these drafts have been alrea= dy approved for publication as RFCs

     

    [JD]  See my first comment above.

     

      1. Wi= th this signaling in place in an SR domain, {ELI, EL} pairs can be inserte= d in the label stack in the following positions:

     &nbs= p;            =             &n= bsp;           &nbs= p;            =             &n= bsp;  i. &nbs= p;    Immediately following an IGP Prefix SID t= hat has been advertised (with PHP) by a node that has signaled its capabil= ity to support {ELI, EL}

     

    [JD]  See my first comment above.  = I am not saying that RFC 8662 doesn’t work.  Rather, like RFC 5= 886 it is under-specified.

    [[Sasha]] From = my POV, the above-mentioned signaling drafts provide the missing specifica= tion. This is quite different from RFC 5586.

    =

     

     &nbs= p;            =             &n= bsp;           &nbs= p;            =              ii. &nb= sp;    Immediately following an Adjacency SID t= hat represents an IGP adjacency between the advertising node and the node = that signaled its capability to support {ELI, EL}

      1. De= pending on specific network topology and the specific stack of SIDs, the r= ules above may be too restrictive to provide effective load balancing, or = not. But IMHO and FWIW this is not really different from the situation with “vanilla” RFC 6790 if, e.g.= , some of the PEs where a given L3VPN service is represented, have adverti= sed their ability to handle {ELI, EL} via LDP or RSVP-TE, and some did not= advertise such capability.  

    My 2c,

    Sasha

     

    Office: +972-39266302=

    Cell:  &nbs= p;   +972-549266302

    Email:   Alexander.Vainshtein@rbbn.com

     

    From: John E Drake <jdrake@juniper.net>
    Sent: Monday, June 21, 2021 9:56 PM
    To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
    Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
    Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

     

    Comment inline.

     

    Yours Irrespectively,

     

    John

     

     

    Juniper Business Use Only

    From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
    Sent: Monday, June 21, 2021 11:46 AM
    To: John E Drake <jdrake@j= uniper.net>
    Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
    Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

     

    = [External Em= ail. Be cautious of content]

     

    John,

    “Great minds th= ink alike”.

     

    Regarding your aside = comment on RFC 8662:

    The last para of Section 4.3 of RFC 6790 says:

     

       As stated in Sections 4.1 and 5, an egress LSR that signals both ELC
    = 
     &=
nbsp; and implicit null MUST pop the ELI and the next label (which sh=
ould
    &n=
bsp;  be the EL), if it encounters a packet with the ELI as the topmo=
st
    &n=
bsp;  label.  Any other LSR (including PHP LSRs) MUST drop such =
packets, as
       per Section 3.=
18 of [RFC3031].
     
    [JD]  If that’s the behavior that we want, then RF=
C 8662 is not deployable.

     

    All that is needed is= to clarify the (rather, self-evident) rules for SIDs for which the origin= ating routers  effectively signal Implicit Null  (explicitly or = implicitly), including:

    1. Al= l Adj-SIDs
    2. All EPE SIDs
    3. IGP Prefix SIDs that have been advertis= ed with PHP (P-flag cleared in IS-IS, NP-flag cleared in OSPF)<= /li>
    4.  

      I do not think that I= have missed anything (Binding SIDs are not involved in PHP).

       

      My 2c,

      Sasha

       

      Office: +972-39266302=

      Cell:  &nbs= p;   +972-549266302

      Email:   Alexander.Vainshtein@rbbn.com

       

      From: John E Drake <jdrake@juniper.net>
      Sent: Monday, June 21, 2021 3:52 PM
      To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>; Loa Andersson <loa@pi.nu>
      Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
      Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

       

      Hi,

       

      I agree with Sasha’s email, below, which is p= roposing what I was proposing several months ago.

       

      As an aside, RFC 8662 does not define what a transi= t LSR should do when it finds an [ELI, EL] pair at the top of the MPLS lab= el stack, either when it understands the label pair or when it doesn't.

       

      Yours Irrespectively,

       

      John

       

       

      Juniper Business Use Only

      From: mpls <mpls-bounces@ietf.org> On Behalf Of Alexander Vainshtein
      Sent: Monday, June 21, 2021 6:55 AM
      To: Loa Andersson <loa@pi.nu>= ;
      Cc: mpls@ietf.org; Haoyu Song = <hsong@futurewei.com>; Je= ffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
      Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

       

      = [External Em= ail. Be cautious of content]

       

      Loa,

      Regarding your question “Would you include= adding a copy of the GAL higher up in the stack to make sure that it is w= ithin readable depth for any LSR?”  my answer is NO.=

       

      I have already said on this thread that if GAL i= s exposed as ToS but not BoS to an existing standards-compliant MPLS forwa= rder, it will not know how to handle it since such handling has not ever b= een defined – not in RFC 5586 and not anywhere else. Stewart has responded that “an o= ld implementation that received a ToS GAL not at BoS would at best throw a= n exception or worst be unpredictable”.  Neither of these optio= ns sounds optimistic to me.

       

      I also do not favor investing=20into a technique= that would guarantee that packets with GAL in the middle of the stack onl= y pass thru new LSRs that know how to handle them .

       

      However, it is quite possible to do the followin= g IMHO:

      1. Retain the exist= ing definitions of GAL just at BoS and ACH that immediately follows the Bo= S
      2. Define new ACH types that can carry new ancillary data, and the structure= s that can be used for this purpose (as you have said, “we can carry= everything in the associated channel”, including TLVs and Sub-TLVs,= if necessary – it will be up to the specific applications to proces= s such structures in ACH, but at least this would not affect MPLS forwardi= ng).
      3. Allow LERs that (a) can detect presence of GAL at BoS and (b) recogniz= e new ACH types to meddle with the information carried in the ACH while fo= rwarding labeled packets in the usual way
      4. Also allow usage of TTL to help L= ERs that recognize new ACH types to meddle with the information carried in= the ACH (similar to what has been done in RFC 8169) even if they cannot detect presence of GAL at BoS due to the= depth of the stack.

       

      I cannot say whether this approach is good enoug= h for the specific set of applications. But it looks to me as reasonably s= afe since it does not require any new forwarding functionality in existing= LERs - primum non nocere.

       

      My 2c,

      Sasha

       

      Office: +972-39266302

      Cell:      +972-5492663= 02

      Email:   Alexander.Vainshtein@rbbn.com

       

       

      -----Original Message-----
      From: Loa Andersson <loa@pi.nu> Sent: Monday, June 21, 2021 1:16 PM
      To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
      Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Stewart Bryant <stewart.bryant@gma= il.com>
      Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS

       

      Sasha,

       

       

      On 21/06/2021 11:55, Alexander Vainshtein wrote:=

      > Loa and all,

      >

      > I fully agree with the proposal "to no= t tamper with ACH anymore".

      >

      >  From my POV, this includes (by implic= ation) not tampering also with

      > GAL as well.

       

      Would you include adding a copy of the GAL highe= r up in the stack to make sure that it is within readable depth for any LS= R?

      >

      > As for the question " If the slot imme= diately after the label stack is

      > reserved for the ACH does this mean the no = other ancillary data may be

      > inserted in this position, e.g. MPLS EH's, = given that there is a GAL

      > in the stack" the answer, IMHO, is YES= .

      >

      > However, it is quite possible to carry any = kind of new information in

      > the ACH, similar to the way this has been d= one in Section 3 of RFC

      > 8169

      > <https://clicktime.symantec.com/3FFh4tSjBeGN2kf7C3a3Sa76H2?u=3D= https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8169%23section-3> where G-ACH is used for residence time measurement.

       

      Logically this means that we can carry everythin= g in the associated channel. However there can only one ACH per packet, ri= ght?

       

      /Loa

      >

      > Regards,

      >

      > Sasha

      >

      > Office: +972-39266302

      >

      > Cell:      +972-54= 9266302

      >

      > Email:   Alexander.Vainshtein= @rbbn.com

      >

      > -----Original Message-----

      > From: Loa Andersson <loa@pi.nu<= /span>>

      > Sent: Monday, June 21, 2021 12:40 PM

      > To: Haoyu Song <hsong= @futurewei.com>; Jeffrey (Zhaohui) Zhang

      > <zz= hang=3D40juniper.net@dmarc.ietf.org>; Alexander Vainshtein

      > <Alexander.= Vainshtein@rbbn.com>; Stewart Bryant

      > <stewart.bryant@= gmail.com>

      > Cc: mpls@ietf.org

      > Subject: Re: [mpls] [EXTERNAL] Indicators i= n the stack and ancillary

      > data after the BoS

      >

      > Haoyu, DT

      >

      > On 17/06/2021 18:56, Haoyu Song wrote:=

      >

      >  > My opinion is to not tamper with= ACH anymore because it's designed

      > for control channel only and so far for a s= pecial scenario. The

      > constraints on GAL and format of ACH are ha= rd to adapt to the new use

      > case requirements.

      >

      >  >

      >

      > I think this is a position that is possible= to defend.

      >

      > One question though.

      >

      > RFC 5586 specifies "that the ACH appea= rs immediately after the bottom

      > of the label stack."

      >

      > If the slot immediately after the label sta= ck is reserved for the ACH

      > does this mean the no other ancillary data = maybe inserted in this

      > position, e.g. MPLS EH's, given that there = is a GAL in the stack?

      >

      > /Loa

      >

      >  > Thanks!

      >

      >  > Haoyu

      >

      >  >

      >

      >  > -----Original Message-----<= /o:p>

      >

      >  > From: mpls <mpls-bounces@ietf.org <mailto:mpl= s-bounces@ietf.org>>

      > On Behalf Of Jeffrey (Zhaohui)

      >

      >  > Zhang

      >

      >  > Sent: Thursday, June 17, 2021 8:= 02 AM

      >

      >  > To: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>; Al= exander

      > Vainshtein

      >

      >  > <Alexander.Vainshtein@rbbn.co= m

      > <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

      >

      >  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

      >

      >  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

      >

      >  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

      > ancillary

      >

      >  > data after the BoS

      >

      >  >

      >

      >  > Hi Loa,

      >

      >  >

      >

      >  >> but I'd like to see the DT a= ddress multiple indicators in the

      > stack and multiple sets of ancillary data a= fter the BoS.

      >

      >  >

      >

      >  > I think the earlier emails of th= is email thread were talking about

      > multiple indicators in the stack; for multi= ple set of ancillary data

      > after the BoS, either the extended ACH or t= he proposed MPLS/generic

      > extension headers or a merge of those propo= sals should be able to

      > handle it. This is alluded to the DataAfter= BOS wiki page.

      >

      >  >

      >

      >  > Thanks.

      >

      >  >

      >

      >  > Jeffrey

      >

      >  >

      >

      >  > -----Original Message-----<= /o:p>

      >

      >  > From: Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>

      >

      >  > Sent: Thursday, June 17, 2021 10= :46 AM

      >

      >  > To: Jeffrey (Zhaohui) Zhang <= zzhang@juniper.net

      > <<= span style=3D"color:windowtext;text-decoration:none">mailto:zzhang@juniper= .net>>; Alexander Vainshtein

      >

      >  > <Alexander.Vainshtein@rbbn.co= m

      > <mailto:Ale= xander.Vainshtein@rbbn.com>>; Stewart Bryant

      >

      >  > <stewart.bryant@gmail.com <mailto:stewa= rt.bryant@gmail.com>>

      >

      >  > Cc: mpls@ietf.org <mailto:mpls@ietf.org><= /p>

      >

      >  > Subject: Re: [mpls] [EXTERNAL] I= ndicators in the stack and

      > ancillary

      >

      >  > data after the BoS

      >

      >  >

      >

      >  > [External Email. Be cautious of = content]

      >

      >  >

      >

      >  >

      >

      >  > DT,

      >

      >  >

      >

      >  > Responded to Jeffrey's mail, but= it is intended to address the

      > entire discussion.

      >

      >  >

      >

      >  > There seem to be enough issues t= o sort out around the GAL/ACH pair,

      > and I was worried about a set of other indi= cators and the data that

      > they might want to put "after the BoS&= quot;. So far I have seen no real

      > effort to address the interference's this m= ight lead to.

      >

      >  >

      >

      >  > Further inline

      >

      >  >

      >

      >  >

      >

      >  > On 17/06/2021 16:15, Jeffrey (Zh= aohui) Zhang wrote:

      >

      >  >> Hi,

      >

      >  >>

      >

      >  >> It's not clear how we could = put a GAL not at a BoS:

      >

      >  >>

      >

      >  >>

      >

      >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      >

      >  >>

      >

      >  >>     = ; |            = ;            &= nbsp;     ACH       = ;            &= nbsp;         

      > |

      >

      >  >>

      >

      >  >>

      >

      >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      >

      >  >>

      >

      >  >>     = ; |            = ;             = ACH TLV Header          =             &n= bsp;

      > |

      >

      >  >>

      >

      >  >>

      >

      >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      >

      >  >>

      >

      >  >>     = ; |            = ;            &= nbsp;           &nb= sp;            &nbs= p;            =  

      > ~

      >

      >  >>

      >

      >  >>     = ; ~            = ;         zero or more ACH TLVs&nb= sp;            = ;       

      > ~

      >

      >  >>

      >

      >  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

      > |

      >

      >  >>

      >

      >  >>

      >

      >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      >

      >  >>

      >

      >  >>     = ; |            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

      > ~

      >

      >  >>

      >

      >  >>     = ; ~            = ;            G-ACh = Message           &= nbsp;           &nb= sp; 

      > ~

      >

      >  >>

      >

      >  >>     = ; ~            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;

      > |

      >

      >  >>

      >

      >  >>

      >

      >  >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      >

      >  >>

      >

      >  >>     = ;            &= nbsp;       Figure 2: G-ACh Packet Payload

      >

      >  >>

      >

      >  >> If the GAL does not have S-b= it set, wouldn't a transit LSR treat

      > any

      >

      >  >> 4-ocet field (i.e. those in = the above Figure) after that GAL as a

      >

      >  >> label+TOS+S+TTL? If that 4-o= ctet field has the S-bit set, the

      > transit

      >

      >  >> LSR will think the label sta= ck ends there even though that's just

      >

      >  >> part of the ACH.<= /p>

      >

      >  >>

      >

      > =20>> Or are you saying that a G= AL not at the BoS will not have the ACH

      >

      >  >> following it?

      =

      >

      >  >

      >

      >  > Well, as far as I understand a G= AL which does not have the NoS-bit

      > set will have other labels after itself. Th= e BoS-bit will be found

      > deeper down stack and the ACH will immediat= ely fo9llow the BoS.

      >

      >  >

      >

      >  > Yes there are issues here, but I= 'd like to see the DT address

      > multiple indicators in the stack and multip= le sets of ancillary data

      > after the BoS.

      >

      >  >

      >

      >  > I think we need to nail down the= relevant questiuons first, and

      > start working on solutions after that.=

      >

      >  >

      >

      >  > /Loa

      >

      >  >>

      >

      >  >> Jeffrey

      >

      >  >>

      >

      >  >> *From:*mpls <mpls-bounces@ietf.org <mailt= o:mpls-bounces@ietf.org>>

      > *On Behalf Of *Alexander

      >

      >  >> Vainshtein

      >

      >  >> *Sent:* Thursday, June 17, 2= 021 5:07 AM

      >

      >  >> *To:* Stewart Bryant <ste= wart.bryant@gmail.com

      > <mailto:stewart.= bryant@gmail.com>>

      >

      >  >> *Cc:* mpls@ietf= .org <mailto:mpls@ietf.org><= /o:p>

      >

      >  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

      >

      >  >> ancillary data after the BoS=

      >

      >  >>

      >

      >  >> *[External Email. Be cautiou= s of content]*

      >

      >  >>

      >

      >  >> Stewart,

      >

      >  >>

      >

      >  >> I fully agree with your stat= ement that "an old implementation that

      >

      >  >> received a ToS GAL not at Bo= S would at best throw an exception or

      >

      >  >> worst be unpredictable"= .

      >

      >  >>

      >

      >  >> Regarding your statement &qu= ot;it is OK to have multiple GALs and GALs

      > not

      >

      >  >> at BoS IFF the creator of th= e LSP ensured that all LSRs on the

      > LSP,

      >

      >  >> including ECMP and FRR paths= that found the GAL at ToS were known

      > to

      >

      >  >> be able to process it correc= tly":

      >

      >  >>

      >

      >  >>   1. I fully agree= with this statement as a general restriction  2.

      >

      >  >> Quite a lot of things have t= o be done in order to make this

      >

      >  >>     = ; restriction work including at least:

      >

      >  >>

      >

      >  >>     = ;  1. The definition of correct processing of GAL at ToS but

      > not at

      >

      >  >>     = ;     BoS must be provided

      >

      >  >>     = ;  2. Advertisement of ability to process GAL not at BoS

      > correctly in

      >

      >  >>     = ;     IGP and=20BGP must be defined

      >

      >  >>     = ;  3. Ability to set up network-wide paths that only cross

      > nodes that

      >

      >  >>     = ;     process GAL correctly must be provided for diffe= rent

      > techniques

      >

      >  >>     = ;     (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.)

      >

      >  >>

      >

      >  >> It is still possible that, a= fter all this work, we shall find out

      >

      >  >> that the benefits of support= ing GAL at ToS but not BoS will be

      > only

      >

      >  >> available in the networks wh= ere all the nodes support the new

      >

      >  >> functionality because presen= ce of non-supporting nodes imposes too

      >

      >  >> many restrictions on connect= ivity and/or resilience.

      >

      >  >>

      >

      >  >> Regards,

      >

      >  >>

      >

      >  >> Sasha

      >

      >  >>

      >

      >  >> Office: +972-39266302

      >

      >  >>

      >

      >  >> Cell:    = ;  +972-549266302

      >

      >  >>

      >

      >  >> Email: Alexander.Vainshtein= @rbbn.com

      > <mailto:Ale= xander.Vainshtein@rbbn.com>

      >

      >  >> <mailto:Alexander.Vainsht= ein@rbbn.com

      > <mailto:Ale= xander.Vainshtein@rbbn.com>>

      >

      >  >>

      >

      >  >> *From:*Stewart Bryant <st= ewart.bryant@gmail.com

      >

      >  >> <mailto:stewart.bryant@gm= ail.com

      > <mailto:stewart.= bryant@gmail.com>>>

      >

      >  >> *Sent:* Thursday, June 17, 2= 021 10:36 AM

      >

      >  >> *To:* Alexander Vainshtein &= lt;Alexander.Vainshtein@rbbn.com

      >

      >  >> <mailto:Alexander.Vainsht= ein@rbbn.com

      > <mailto:Ale= xander.Vainshtein@rbbn.com>>>

      >

      >  >> *Cc:* Stewart Bryant <ste= wart.bryant@gmail.com

      >

      >  >> <mailto:stewart.bryant@gm= ail.com

      > <mailto:stewart.= bryant@gmail.com>>>; gregory.mirsky@ztetx.com

      > <mailto:gregory.= mirsky@ztetx.com>

      >

      >  >> <mailto:gregory.mirsky@zt= etx.com

      > <mailto:gregory.= mirsky@ztetx.com>>;

      > mpls@ietf.org <<= a href=3D"mailto:mpls@ietf.org">mailto:mpls@ietf.org>

      >

      >  >> <mailto:mpls@ietf.org <mailto:mpls@ietf.org>= ;>

      >

      >  >> *Subject:* Re: [mpls] [EXTER= NAL] Indicators in the stack and

      >

      >  >> ancillary data after the BoS=

      >

      >  >>

      >

      >  >>     = ; On 17 Jun 2021, at 07:45, Alexander Vainshtein

      >

      >  >>     = ; <Alexander.Vainshtein@rbbn.com

      >

      >  >>     = ; <mailto:Alexander.Vainshtein@rbbn.com

      > <mailto:Ale= xander.Vainshtein@rbbn.com>>> wrote:

      >

      >  >>

      >

      >  >>     = ; While that might be the case, I think that the Open DT may

      > give it a

      >

      >  >>     = ; try and investigate how the existing systems will handle GAL

      > being

      >

      >  >>     = ; not the BoS label.

      >

      >  >>

      >

      >  >>     = ; */[[Sasha]] Great minds think alike! One useful step could be=

      >

      >  >>     = ; collecting the known actual behavior of popular

      > implementations in

      >

      >  >>     = ; this case, say, by running a survey among the vendors - what

      > do you

      >

      >  >>     = ; think?/*

      >

      >  >>

      >

      >  >> That is actually a considera= ble amount of work that will take a while.

      >

      >  >>

      >

      >  >> It seems to me that an old i= mplementation that received a ToS GAL

      > not

      >

      >  >> at BoS would at best throw a= n exception or worst be unpredictable.

      >

      >  >>

      >

      >  >> The original assumed process= ing model is to take the context of

      > the

      >

      >  >> PW label or PW+FAT label, di= scover the GAL and then process the

      > GAL

      >

      >  >> in the context of the PW lab= el.

      >

      >  >>

      >

      >  >> When we extended GAL to appl= y to LSPs we again had the model that

      > the

      >

      >  >> GAL operated in the context = of the LSP label that preceded it for

      >

      >  >> context. It was still BoS.

      >

      >  >>

      >

      >  >> Putting the GAL further up t= he stack is a new behaviour.

      >

      >  >>

      >

      >  >> If it arrives at an LSR that= knows the new semantic all is good.

      >

      >  >>

      >

      >  >> If it arrives at an LSR that= does not know the new semantic then

      >

      >  >>

      >

      >  >> a) An error has occurred eit= her in setting up the LSP, or in forwarding.

      >

      >  >>

      >

      >  >> b) The behaviour at the rece= iving node is unpredictable, but in

      > any

      >

      >  >> well written implementation = should just result in the packet being

      >

      >  >> dropped and counted as with = any other Mal-formed packet.

      >

      >  >>

      >

      >  >> So I would think that it is = OK to have multiple GALs and GALs not

      > at

      >

      >  >> BoS IFF the creator of the L= SP ensured that all LSRs on the LSP,

      >

      >  >> including ECMP and FRR paths= that found the GAL at ToS were known

      > to

      >

      >  >> be able to process it correc= tly.

      >

      >  >>

      >

      >  >> A GAL not at BoS and not at = ToS should not be inspected or

      > processed

      >

      >  >> by any LSR that did not know= what it was doing, and to attempt to

      >

      >  >> precess it would be a violat= ion of the normal MPLS processing model.

      >

      >  >>

      >

      >  >> - Stewart

      >

      >  >>

      >

      >  >>

      >

      >  >> Notice: This e-mail together= with any attachments may contain

      >

      >  >> information of Ribbon Commun= ications Inc. and its Affiliates that

      > is

      >

      >  >> confidential and/or propriet= ary for the sole use of the intended

      >

      >  >> recipient. Any review, discl= osure, reliance or distribution by

      > others

      >

      >  >> or forwarding without expres= s permission is strictly prohibited.

      > If

      >

      >  >> you are not the intended rec= ipient, please notify the sender

      >

      >  >> immediately and then=20delet= e all copies, including any attachments.

      >

      >  >>

      >

      >  >>

      >

      >  >> Juniper Business Use Only

      >

      >  >>

      >

      >  >>

      >

      >  >> ____________________________= ___________________

      >

      >  >> mpls mailing list=

      >

      >  >> mpls@ietf.org <mailto:mpls@ietf.org><= /p>

      >

      >  >>

      > https://clicktime.sy= mantec.com/32ELHVPxdZe1NeGCU5oipbG6H2?u=3Dhttps%3A%<= /p>

      > <https://clicktime.symantec.com/32ELHVPx= dZe1NeGCU5oipbG6H2?u=3Dhttps%3A%

      > 25>

      >

      >  >>

      > 2F%2Fnam11.safelinks.protection.outlook.com= %2F%3Furl%3Dhttps%253A%252

      >

      >  >> F%252Furld

      >

      >  >>

      > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.= org%2Fmailman%2Flistinfo%2

      >

      >  >> F

      >

      >  >>

      > mpls__%3B!!NEt6yMaO-gk!RVgTGVbknjgIjv3x-q8o= b1JglFKOP6qKkgAcCSPbeBMMj2

      >

      >  >> A

      >

      >  >>

      > nexFnPevXopeK1a6u%24&amp;data=3D04%7C01= %7Chsong%40futurewei.com%7Ccc49d

      >

      >  >> e

      >

      >  >>

      > 9585a24092e29708d931a0e327%7C0fee8ff2a3b240= 189c753a1d5591fedc%7C1%7C0

      >

      >  >> %

      >

      >  >>

      > 7C637595389337881384%7CUnknown%7CTWFpbGZsb3= d8eyJWIjoiMC4wLjAwMDAiLCJQ

      >

      >  >> I

      >

      >  >>

      > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C1000&amp;sdata=3D5et4Juc3Ij

      >

      >  >> G

      >

      >  >> dfux%2FR5MsJnuTYDWL6S4pZ8uz3= F6h34Q%3D&amp;reserved=3D0

      >

      >  >>

      >

      >  >

      >

      >  > --

      >

      >  >

      >

      >  > Loa Andersson   &= nbsp;           &nb= sp;        email: loa@pi.nu=

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boundary="_000_BY3PR05MB808127DC75C4CA6971FBFF30C7099BY3PR05MB8081namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR05MB8081.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0787def0-9681-4242-604a-08d935934f9d X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jun 2021 15:35:06.0599 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: QKS0OlcgpLnQYyfghO7KzP1B2QpNrLnXblqN+pmp0RqZxjOmJkqb2NGcbIfV6T/BBWfsWqyZDpK+IhSujdK4vg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR05MB4664 X-Proofpoint-GUID: Zuoip0ACw-9r7DTZxgtTVdTksyk9wgxv X-Proofpoint-ORIG-GUID: Zuoip0ACw-9r7DTZxgtTVdTksyk9wgxv X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-22_08:2021-06-22, 2021-06-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 mlxscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106220096 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 15:35:17 -0000 --_000_BY3PR05MB808127DC75C4CA6971FBFF30C7099BY3PR05MB8081namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Snipped, comment inline [JD1}. Yours Irrespectively, John 1. I have sent the previous email as a response to your aside claim = that "RFC 8662 does not define what a transit LSR should do when it finds a= n [ELI, EL] pair at the top of the MPLS label stack, either when it underst= ands the label pair or when it doesn't". As I see it, both Bruno and I have= demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of = the form: "This document updates the transit LSR behavior defined in RFC 6= 790 to allow a transit LSR that understands entropy labels to remove an [EL= I, EL] pair that it sees at the top of an MPLS label stack. This requires = a transit LSR to indicate this capability to other LSRs in the SR domain an= d it requires the ingress LSR to ensure that when it inserts [ELI, EL] pair= s in the MPLS label stack they will only be at the top of the MPLS label st= ack when received by a transit LSR with this capability." [[Sasha]] I have not seen any such statement either. However, I think that = we may be dealing with a terminology issue. I believe that in SR a node tha= t originates advertisement, say, of an IGP Prefix SID, is considered as the= egress node for the segment represented by this SID, even if it is a trans= it node for an LSP that includes this SID in the middle of the stack of SID= s. This is why they have assumed that considerations of 6790 pertaining to = egress LERs are sufficient. [JD1] This seems like quite a stretch. Also, as I mentioned in my first e= mail, there is no discussion of how an [ELI, EL] pair at the top on a MPLS = label stack is to be processed or ensuring, when building an MPLS label sta= ck, that [ELI, EL] pairs need to be inserted such that they rise to the top= of an MPLS label stack only when they are received by a transit LSR that u= nderstands entropy labels. [JD1} Do you think that it would be safe to re-use the RFC 8662 techniques= for GAL? I.e., a node indicates whether it can receive a GAL at the top o= f an MPLS label stack and the ingress LSR constructs MPLS label stacks in w= hich a GAL rises to the top of the stack only at such nodes. Or do impleme= ntations of RFC 5586 explicitly scan an MPLS label stack for GAL labels tha= t are not at the bottom of the stack? This seems like silly behavior but o= ne never knows. Juniper Business Use Only --_000_BY3PR05MB808127DC75C4CA6971FBFF30C7099BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Snipped, comment inline [JD1}.

 

Yours Irrespectively,

 

John

 

1. &nbs= p;      I have sent the previous email as a response to your aside clai= m that “RFC 8662 does not define what a transit LSR should do = when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the label pair or when it doe= sn't”. As I see it, both Bruno and I ha= ve demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere in= RFC 8662 do I see a statement of the form:  “This document upda= tes the transit LSR behavior defined in RFC 6790 to allow a transit LSR tha= t understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires a= transit LSR to indicate this capability to other LSRs in the SR domain and= it requires the ingress LSR to ensure that when it inserts [ELI, EL] pairs= in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with = this capability.”

[[Sasha]] I have= not seen any such statement either. However, I think that we may be dealin= g with a terminology issue. I believe that in SR a node that originates adv= ertisement, say, of an IGP Prefix SID, is considered as the egress node for the segment represented by this SI= D, even if it is a transit node for an LSP that includes this SID in the middle of the stack of SIDs= . This is why they have assumed that considerations of 6790 pertaining to e= gress LERs are sufficient.

 

[JD1]  This seems like quite a stretch.&n= bsp; Also, as I mentioned in my first email, there is no discussion of how = an [ELI, EL] pair at the top on a MPLS label stack is to be processed or en= suring, when building an MPLS label stack, that [ELI, EL] pairs need to be inserted such that they rise to the top of an M= PLS label stack only when they are received by a transit LSR that understan= ds entropy labels.

 

[JD1}  Do you think that it would be safe= to re-use the RFC 8662 techniques for GAL?  I.e., a node indicates wh= ether it can receive a GAL at the top of an MPLS label stack and the ingres= s LSR constructs MPLS label stacks in which a GAL rises to the top of the stack only at such nodes.  Or do implem= entations of RFC 5586 explicitly scan an MPLS label stack for GAL labels th= at are not at the bottom of the stack?  This seems like silly behavior= but one never knows.

 

 

Juniper Business Use Only

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charset="us-ascii" Content-Transfer-Encoding: quoted-printable John, Regarding your question "Do you think that it would be safe to re-use the = RFC 8662 techniques for GAL? I.e., a node indicates whether it can receiv= e a GAL at the top of an MPLS label stack and the ingress LSR constructs M= PLS label stacks in which a GAL rises to the top of the stack only at such= nodes": IMHO the answer depends on what the node that detects GAL at ToS but not B= oS is handing this. I see two options: 1. Option 1: Pop GAL, process the ACH and forward based on the next = label in the stack. This would be safe but probably useless for the specif= ic applications people are trying to address 2. Option 2: Same as above, but push GAL on top of the new label st= ack when forwarding the packet based on the next label in the stack) - i.e= ., similar to what is defined or the Router Alert label. This would probab= ly work for the targeted applications, but would not be safe - unless you = only pass thru the new nodes that understand GAL at ToS but not BoS. Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake Sent: Tuesday, June 22, 2021 6:35 PM To: Alexander Vainshtein Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zha= ng ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data = after the BoS Hi, Snipped, comment inline [JD1}. Yours Irrespectively, John 1. I have sent the previous email as a response to your aside clai= m that "RFC 8662 does not define what a transit LSR should do when it find= s an [ELI, EL] pair at the top of the MPLS label stack, either when it und= erstands the label pair or when it doesn't". As I see it, both Bruno and I= have demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of= the form: "This document updates the transit LSR behavior defined in RFC= 6790 to allow a transit LSR that understands entropy labels to remove an = [ELI, EL] pair that it sees at the top of an MPLS label stack. This requi= res a transit LSR to indicate this capability to other LSRs in the SR doma= in and it requires the ingress LSR to ensure that when it inserts [ELI, EL= ] pairs in the MPLS label stack they will only be at the top of the MPLS l= abel stack when received by a transit LSR with this capability." [[Sasha]] I have not seen any such statement either. However, I think that= we may be dealing with a terminology issue. I believe that in SR a node t= hat originates advertisement, say, of an IGP Prefix SID, is considered as = the egress node for the segment represented by this SID, even if it is a t= ransit node for an LSP that includes this SID in the middle of the stack o= f SIDs. This is why they have assumed that considerations of 6790 pertaini= ng to egress LERs are sufficient. [JD1] This seems like quite a stretch. Also, as I mentioned in my first = email, there is no discussion of how an [ELI, EL] pair at the top on a MPL= S label stack is to be processed or ensuring, when building an MPLS label = stack, that [ELI, EL] pairs need to be inserted such that they rise to the= top of an MPLS label stack only when they are received by a transit LSR t= hat understands entropy labels. [JD1} Do you think that it would be safe to re-use the RFC 8662 technique= s for GAL? I.e., a node indicates whether it can receive a GAL at the top= of an MPLS label stack and the ingress LSR constructs MPLS label stacks i= n which a GAL rises to the top of the stack only at such nodes. Or do imp= lementations of RFC 5586 explicitly scan an MPLS label stack for GAL label= s that are not at the bottom of the stack? This seems like silly behavior= but one never knows. Juniper Business Use Only Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments. --_000_MW4PR03MB639500B5FF983CC8AECD19B3F6099MW4PR03MB6395namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

John,

Regarding your questi= on “Do you think that it would be safe to re-use the RF= C 8662 techniques for GAL?  I.e., a node indicates whether it can rec= eive a GAL at the top of an MPLS label stack and the ingress LSR constructs MPLS label stacks in which a GAL rises to the top = of the stack only at such nodes̶= 1;:

 

IMHO the answer depen= ds on what the node that detects GAL at ToS but not BoS is handing this. I= see two options:

1.       Option 1: Pop= GAL, process the ACH and forward based on the next label in the stack. Th= is would be safe but probably useless for the specific applications people are trying to address<= /p>

2.       Option 2:&nbs= p; Same as above, but push GAL on top of the new label stack when forwardi= ng the packet based on the next label in the stack) – i.e., similar to what is defined or the Router Alert label= . This would probably work for the targeted applications, but would not be= safe – unless you only pass thru the new nodes that understand GAL = at ToS but not BoS.

 

Regards,

Sasha

 

Office: +972-39266302=

Cell:  &nbs= p;   +972-549266302

Email:   Al= exander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>= ;
Sent: Tuesday, June 22, 2021 6:35 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey = (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Anderss= on <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillar= y data after the BoS

 

Hi,

 

Snipped, comment inline [JD1}.

 

Yours Irrespectively,

 

John

 

1. &n= bsp;       I have sent the previous email as a = response to your aside claim that “RFC 8662 does not define w= hat a transit LSR should do when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the l= abel pair or when it doesn't”. As I se= e it, both Bruno and I have demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere i= n RFC 8662 do I see a statement of the form:  “This document up= dates the transit LSR behavior defined in RFC 6790 to allow a transit LSR = that understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires = a transit LSR to indicate this capability to other LSRs in the SR domain a= nd it requires the ingress LSR to ensure that when it inserts [ELI, EL] pa= irs in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with= this capability.”

[[Sasha]] I hav= e not seen any such statement either. However, I think that we may be deal= ing with a terminology issue. I believe that in SR a node that originates = advertisement, say, of an IGP Prefix SID, is considered as the egress node for the segment represented by this S= ID, even if it is a transit node for an LSP that includes this SID in the middle of the stack of SIDs. This is why they have assumed that considerations of 6790 pertaining to= egress LERs are sufficient.

 

[JD1]  This seems like quite a stretch.&= nbsp; Also, as I mentioned in my first email, there is no discussion of ho= w an [ELI, EL] pair at the top on a MPLS label stack is to be processed or= ensuring, when building an MPLS label stack, that [ELI, EL] pairs need to be inserted such that they rise to the top of an = MPLS label stack only when they are received by a transit LSR that underst= ands entropy labels.

 

[JD1}  Do you think that it would be saf= e to re-use the RFC 8662 techniques for GAL?  I.e., a node indicates = whether it can receive a GAL at the top of an MPLS label stack and the ing= ress LSR constructs MPLS label stacks in which a GAL rises to the top of the stack only at such nodes.  Or do imple= mentations of RFC 5586 explicitly scan an MPLS label stack for GAL labels = that are not at the bottom of the stack?  This seems like silly behav= ior but one never knows.

 

 

Juniper Business Use Only


Notice: This e-mail together with any attachments may contain information = of Ribbon Communications Inc. and its Affiliates that is confidential and/= or proprietary for the sole use of the intended recipient. Any review, dis= closure, reliance or distribution by others or forwarding without express = permission is strictly prohibited. If you are not the intended recipient, = please notify the sender immediately and then delete all copies, including= any attachments.
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Tue, 22 Jun 2021 17:57:57 +0000 From: John E Drake To: Alexander Vainshtein CC: "mpls@ietf.org" , Haoyu Song , "Jeffrey (Zhaohui) Zhang" , Loa Andersson Thread-Topic: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXY0Rmz8bFcB45u0+GX6eUo5f23asX0EoAgAAZVICAAFZpgIAACH8AgAAEQgCAACAGgIAFz3SAgAAEUoCAAAW7AIAACtKAgAAeZRCAADL8gIAANI6AgAE3AYCAAAGGMIAAGNyAgAAAfkCAACNugIAADASQ Date: Tue, 22 Jun 2021 17:57:56 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <9f5f81aa-4529-8d83-ef5a-1c809bf3251c@pi.nu> <32ece802-18b3-fb0a-db41-212fb566d22e@pi.nu> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.6.100.41 dlp-reaction: no-action msip_labels: MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Enabled=true; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_SetDate=2021-06-22T17:57:54Z; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Method=Standard; MSIP_Label_0633b888-ae0d-4341-a75f-06e04137d755_Name=0633b888-ae0d-4341-a75f-06e04137d755; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Comment inline. Yours Irrespectively, John Juniper Business Use Only From: Alexander Vainshtein Sent: Tuesday, June 22, 2021 1:10 PM To: John E Drake Cc: mpls@ietf.org; Haoyu Song ; Jeffrey (Zhaohui) Zhan= g ; Loa Andersson Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS [External Email. Be cautious of content] John, Regarding your question "Do you think that it would be safe to re-use the R= FC 8662 techniques for GAL? I.e., a node indicates whether it can receive = a GAL at the top of an MPLS label stack and the ingress LSR constructs MPLS= label stacks in which a GAL rises to the top of the stack only at such nod= es": IMHO the answer depends on what the node that detects GAL at ToS but not Bo= S is handing this. I see two options: 1. Option 1: Pop GAL, process the ACH and forward based on the next labe= l in the stack. This would be safe but probably useless for the specific ap= plications people are trying to address [JD] Why? The ingress node would have placed multiple GALs within the MPL= S label stack and subsequent transit LSRs would operate on the next GAL. T= his is how RFC 8662 works. 1. Option 2: Same as above, but push GAL on top of the new label stack = when forwarding the packet based on the next label in the stack) - i.e., si= milar to what is defined or the Router Alert label. This would probably wor= k for the targeted applications, but would not be safe - unless you only pa= ss thru the new nodes that understand GAL at ToS but not BoS. [JD] This is not how RFC 8662 works Regards, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@rbbn.com From: John E Drake > Sent: Tuesday, June 22, 2021 6:35 PM To: Alexander Vainshtein > Cc: mpls@ietf.org; Haoyu Song >; Jeffrey (Zhaohui) Zhang >; Loa Anderss= on > Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary data a= fter the BoS Hi, Snipped, comment inline [JD1}. Yours Irrespectively, John 1. I have sent the previous email as a response to your aside claim = that "RFC 8662 does not define what a transit LSR should do when it finds a= n [ELI, EL] pair at the top of the MPLS label stack, either when it underst= ands the label pair or when it doesn't". As I see it, both Bruno and I have= demonstrated that this behavior is defined [JD] Perhaps I missed it, but nowhere in RFC 8662 do I see a statement of = the form: "This document updates the transit LSR behavior defined in RFC 6= 790 to allow a transit LSR that understands entropy labels to remove an [EL= I, EL] pair that it sees at the top of an MPLS label stack. This requires = a transit LSR to indicate this capability to other LSRs in the SR domain an= d it requires the ingress LSR to ensure that when it inserts [ELI, EL] pair= s in the MPLS label stack they will only be at the top of the MPLS label st= ack when received by a transit LSR with this capability." [[Sasha]] I have not seen any such statement either. However, I think that = we may be dealing with a terminology issue. I believe that in SR a node tha= t originates advertisement, say, of an IGP Prefix SID, is considered as the= egress node for the segment represented by this SID, even if it is a trans= it node for an LSP that includes this SID in the middle of the stack of SID= s. This is why they have assumed that considerations of 6790 pertaining to = egress LERs are sufficient. [JD1] This seems like quite a stretch. Also, as I mentioned in my first e= mail, there is no discussion of how an [ELI, EL] pair at the top on a MPLS = label stack is to be processed or ensuring, when building an MPLS label sta= ck, that [ELI, EL] pairs need to be inserted such that they rise to the top= of an MPLS label stack only when they are received by a transit LSR that u= nderstands entropy labels. [JD1} Do you think that it would be safe to re-use the RFC 8662 techniques= for GAL? I.e., a node indicates whether it can receive a GAL at the top o= f an MPLS label stack and the ingress LSR constructs MPLS label stacks in w= hich a GAL rises to the top of the stack only at such nodes. Or do impleme= ntations of RFC 5586 explicitly scan an MPLS label stack for GAL labels tha= t are not at the bottom of the stack? This seems like silly behavior but o= ne never knows. Juniper Business Use Only Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express perm= ission is strictly prohibited. If you are not the intended recipient, pleas= e notify the sender immediately and then delete all copies, including any a= ttachments. --_000_BY3PR05MB80817986B556C84864E03CD8C7099BY3PR05MB8081namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Comment inline.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: Alexander Vainshtein <Alexander.Vain= shtein@rbbn.com>
Sent: Tuesday, June 22, 2021 1:10 PM
To: John E Drake <jdrake@juniper.net>
Cc: mpls@ietf.org; Haoyu Song <hsong@futurewei.com>; Jeffrey (= Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson= <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

<= span style=3D"font-size:10.5pt;font-family:"Lato",sans-serif;colo= r:black">[External Email. Be cautious of content]

 

John,

Regarding your questio= n “Do you think that it would be safe to re-use the RFC = 8662 techniques for GAL?  I.e., a node indicates whether it can receiv= e a GAL at the top of an MPLS label stack and the ingress LSR constructs MPLS label stacks in which a GAL rises to the top o= f the stack only at such nodes”= :

 

IMHO the answer depend= s on what the node that detects GAL at ToS but not BoS is handing this. I s= ee two options:

  1. Option 1: Pop GAL, process the ACH and forward based on the n= ext label in the stack. This would be safe but probably useless for the spe= cific applications people are trying to address

 

[JD]  Why?  The ingress node would h= ave placed multiple GALs within the MPLS label stack and subsequent transit= LSRs would operate on the next GAL.  This is how RFC 8662 works. &nbs= p;

 

  1. Option 2:  Same as above, but push GAL on top of the new= label stack when forwarding the packet based on the next label in the stac= k) – i.e., similar to what is defined or the Router Alert label. This= would probably work for the targeted applications, but would not be safe – unless you only pass thru the new nodes that= understand GAL at ToS but not BoS.

 

[JD]  This is not how RFC 8662 works =

 

 

Regards,

Sasha

 

Office: +972-39266302<= o:p>

Cell:   = ;   +972-549266302

Email:   Alexander.Vainshtein@rbbn.com

 

From: John E Drake <jdrake@juniper.net>
Sent: Tuesday, June 22, 2021 6:35 PM
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
Cc: mpls@ietf.org; Haoyu Song &= lt;hsong@futurewei.com>; Jeff= rey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>; Loa Andersson <loa@pi.nu>
Subject: RE: [mpls] [EXTERNAL] Indicators in the stack and ancillary= data after the BoS

 

Hi,

 

Snipped, comment inline [JD1}.

 

Yours Irrespectively,

 

John

 

1. &nbs= p;      I have sent the previous email as a response to your aside clai= m that “RFC 8662 does not define what a transit LSR should do = when it finds an [ELI, EL] pair at the top of the MPLS label stack, either when it understands the label pair or when it doe= sn't”. As I see it, both Bruno and I ha= ve demonstrated that this behavior is defined

 

[JD]  Perhaps I missed it, but nowhere in= RFC 8662 do I see a statement of the form:  “This document upda= tes the transit LSR behavior defined in RFC 6790 to allow a transit LSR tha= t understands entropy labels to remove an [ELI, EL] pair that it sees at the top of an MPLS label stack.  This requires a= transit LSR to indicate this capability to other LSRs in the SR domain and= it requires the ingress LSR to ensure that when it inserts [ELI, EL] pairs= in the MPLS label stack they will only be at the top of the MPLS label stack when received by a transit LSR with = this capability.”

[[Sasha]] I have= not seen any such statement either. However, I think that we may be dealin= g with a terminology issue. I believe that in SR a node that originates adv= ertisement, say, of an IGP Prefix SID, is considered as the egress node for the segment represented by this SI= D, even if it is a transit node for an LSP that includes this SID in the middle of the stack of SIDs= . This is why they have assumed that considerations of 6790 pertaining to e= gress LERs are sufficient.

 

[JD1]  This seems like quite a stretch.&n= bsp; Also, as I mentioned in my first email, there is no discussion of how = an [ELI, EL] pair at the top on a MPLS label stack is to be processed or en= suring, when building an MPLS label stack, that [ELI, EL] pairs need to be inserted such that they rise to the top of an M= PLS label stack only when they are received by a transit LSR that understan= ds entropy labels.

 

[JD1}  Do you think that it would be safe= to re-use the RFC 8662 techniques for GAL?  I.e., a node indicates wh= ether it can receive a GAL at the top of an MPLS label stack and the ingres= s LSR constructs MPLS label stacks in which a GAL rises to the top of the stack only at such nodes.  Or do implem= entations of RFC 5586 explicitly scan an MPLS label stack for GAL labels th= at are not at the bottom of the stack?  This seems like silly behavior= but one never knows.

 

 

Juniper Business Use Only


Notice: This e-mail together with any attachments may contain information o= f Ribbon Communications Inc. and its Affiliates that is confidential and/or= proprietary for the sole use of the intended recipient. Any review, disclo= sure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If= you are not the intended recipient, please notify the sender immediately a= nd then delete all copies, including any attachments.

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Tue, 22 Jun 2021 18:10:20 +0000 From: Haoyu Song To: "bruno.decraene@orange.com" , "draft-song-mpls-eh-indicator@ietf.org" CC: "mpls@ietf.org" , Loa Andersson , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZnp1KmXm0GDTTUWo1eOKTl9pvqseqjHAgAAA0ZCAAA1wYIAA+maAgAChoJA= Date: Tue, 22 Jun 2021 18:10:20 +0000 Message-ID: References: <202106170323552620410@zte.com.cn> <1bd54f43-880e-07f9-93cd-7d0aba9266d0@pi.nu> <23638_1624265401_60D052B9_23638_17_1_53C29892C857584299CBF5D05346208A4CDF1B34@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <14386_1624294152_60D0C307_14386_277_1_53C29892C857584299CBF5D05346208A4CDF30CC@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17500_1624350791_60D1A047_17500_121_9_53C29892C857584299CBF5D05346208A4CDF3F3D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <17500_1624350791_60D1A047_17500_121_9_53C29892C857584299CBF5D05346208A4CDF3F3D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: orange.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY3PR13MB4787.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c8f67a0b-b721-47a6-c3ed-08d935a8ff65 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jun 2021 18:10:20.3829 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9fNTVzuWpcjXdiQ+k153BIiFImGTSeqohMr+KNXqxnp6IrVFDU3vya5o2jFhjHOx2+ra5wZGPv7GcN1i87UTCA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR13MB4343 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 18:10:34 -0000 Hi Bruno,=20 Thanks for the response.=20 Just one clarification. What I mean for "forced binding" is that: EL and E= H are two independent use cases but if we require encoding ELI to indicate = EH, we need both in a packet which may not be necessary. In other words, if= we don't need (or support) EL at all, we still need to find another way to= indicate EH. Regards, Haoyu -----Original Message----- From: bruno.decraene@orange.com =20 Sent: Tuesday, June 22, 2021 1:33 AM To: Haoyu Song ; draft-song-mpls-eh-indicator@ietf.org Cc: mpls@ietf.org; Loa Andersson ; Jeffrey (Zhaohui) Zhang ; Alexander Vainshtein ; Stew= art Bryant Subject: RE: [mpls] Indicators in the stack and ancillary data after the Bo= S Hi Haoyu, Thanks for replying. Please see inline [Bruno] > -----Original Message----- > From: Haoyu Song [mailto:hsong@futurewei.com] > Sent: Monday, June 21, 2021 7:44 PM > To: DECRAENE Bruno INNOV/NET ; Loa=20 > Andersson ; Jeffrey (Zhaohui) Zhang ;=20 > Alexander Vainshtein ; Stewart Bryant=20 > ; draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after=20 > the BoS >=20 > Hi Bruno, >=20 > Thanks for the clarification. We might have some issues using the=20 > forced binding in some cases. [Bruno] I'm not familiar with this 'forced binding' term. > For example, in our EH architecture, we allow an EH to be inserted or=20 > removed at any nodes on an LSP. [Bruno] As the thread is about EH _indicator_ I'll focus on the indicator. = Draft [1] does not forbid the indicator to be modified en route. [1] https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdat= atracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-l= abel-id-01%23section-2&data=3D04%7C01%7Chsong%40futurewei.com%7Cc4ee945= 27683473cb22408d935586024%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C6375= 99475954543231%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIi= LCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DpM57vSqNe51mL1PGdXKahJjdy= M6B1yzl23ftktvlYmQ%3D&reserved=3D0=20 > Also, ELI+EI are two labels, which is more expensive than one SPL=20 > solution. [Bruno] It would be more expensive only in the case that EL is not needed/useful AN= D that one SPL be allocated for signaling the EH. In all other cases, it's less expensive.=20 > Having said this, I could list your proposal as a possible solution. =20 [Bruno] OK. I believe it should, as per the abstract of draft-song-mpls-eh-= indicator > BTW, Kireeti and I have discussed a possible option working in a differen= t way. > We would use a new SPL to indicate multiples things (also by encoding=20 > the unused TTL/CoS bits): the existence of other special labels in the=20 > label stack (e.g., ELI+EL) and the existence/location of extension=20 > headers after the label stack. Since we have a new SPL, we have more free= dom to define its behavior. [Bruno] Sure it also works. Different tradeoffs. Best regards, --Bruno=20 >=20 > Best, > Haoyu >=20 > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Monday, June 21, 2021 9:49 AM > To: Haoyu Song ; Loa Andersson ;=20 > Jeffrey > (Zhaohui) Zhang ; Alexander Vainshtein=20 > ; Stewart Bryant=20 > ; draft-song-mpls-eh-indicator@ietf.org > Cc: mpls@ietf.org > Subject: RE: [mpls] Indicators in the stack and ancillary data after=20 > the BoS >=20 > Hi Haoyu, >=20 > > From: Haoyu Song [mailto:hsong@futurewei.com] > > > > Hi Bruno, > > > > For clarification, does it mean an entropy label must be present in the= packet? >=20 > Yes. (Both ELI and EL.) >=20 > > What if it doesn't have such a label? >=20 > The node requiring the indicator adds the Entropy Label (ELI, EL). I=20 > guess same principle as the other options discussed in the Figure 5 of=20 > draft-song-mpls-eh- indicator. > In which case you get Entropy information for free (I mean no extra=20 > label). But from the entropy standpoint, it would be better to have=20 > the EL, ELI pushed by the ingress as this is the node which should have t= he most entropy information. >=20 > Thanks, > --Bruno >=20 > > Thanks! > > > > Haoyu > > > > -----Original Message----- > > From: bruno.decraene@orange.com > > Sent: Monday, June 21, 2021 1:50 AM > > To: Loa Andersson ; Jeffrey (Zhaohui) Zhang=20 > > ; Alexander Vainshtein=20 > > ; Stewart Bryant=20 > > ; draft-song-mpls-eh-indicator@ietf.org > > Cc: mpls@ietf.org > > Subject: RE: [mpls] Indicators in the stack and ancillary data after=20 > > the BoS > > > > [+ authors of draft-song-mpls-eh-indicator] > > > > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa=20 > > > Andersson > > > > > > Jeffrey, > > > > > > > > > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > > > Hi Loa, > > > > > > > >> but I'd like to see the DT address multiple indicators in the=20 > > > >> stack and multiple > > > sets of ancillary data after the BoS. > > > > > > > > I think the earlier emails of this email thread were talking=20 > > > > about multiple indicators > > > in the stack; for multiple set of ancillary data after the BoS,=20 > > > either the extended ACH or the proposed MPLS/generic extension=20 > > > headers or a merge of those proposals should be able to handle it. > > > This is alluded to the DataAfterBOS wiki page. > > > > > > hmm - yes partly, but there are several indicators proposed in=20 > > > several drafts > > > > > > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH=20 > > > indicator > > > > > > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a=20 > > > special purpose label (FAI) as indicators > > > > > > there has also been discussion about putting more than one GAL=20 > > > in the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > draft-many-mpls-multiple-gal proposes to add a copy of the GAL=20 > > > higher uop the stack so that LSRs with a too shallow maximun=20 > > > readable depth might reach the GAL > > > > > > there has also been discussion about putting more than one GAL=20 > > > in the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > draft-song-mpls-eh-indicator have a list of potential=20 > > > indicators, that is also telling if the EH should be processed on=20 > > > every EH capable node or "just" at ingress and egress > > > > The following draft proposes a way to carry indicators. > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fda > > ta > > tracker > > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-la > > be > > l- > > id%23section- > > > 2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b6895f808 > > > d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217 > > > 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > > > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK > > 0XuDLugXG6yP6jRYIlgbDuYrh%2B7uM%3D&reserved=3D0 > > > > It's short (less than one page) and backward compatible for LSR & LER. > > > > Referring to table 5 of draft-song-mpls-eh-indicator it also > > - does not require additional label assuming Entropy Label is=20 > > already used for load balancing > > - does not require an additional scarce resource (Special-Purpose=20 > > MPLS Label > > value) > > - allows location freedom > > - does not need control plane extension > > > > Could the authors of draft-song-mpls-eh-indicator update their table=20 > > 5 in order to include the above draft? > > > > Thanks, > > Regards, > > --Bruno > > > > > > > > The FAI might put ancillary data after the BoS. > > > > > > I think we need to have a comprehensive discussion > > > > > > - first what we want to have > > > - second how when re-direct by an indicator we find the > > > ancillary data that belongs to that indicator. > > > > > > /Loa > > > > > > > > > > > > > > > > > > > > Thanks. > > > > > > > > Jeffrey > > > > > > > > -----Original Message----- > > > > From: Loa Andersson > > > > Sent: Thursday, June 17, 2021 10:46 AM > > > > To: Jeffrey (Zhaohui) Zhang ; Alexander=20 > > > > Vainshtein > > > ; Stewart Bryant=20 > > > > > > > Cc: mpls@ietf.org > > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > > > ancillary data after > > > the BoS > > > > > > > > [External Email. Be cautious of content] > > > > > > > > > > > > DT, > > > > > > > > Responded to Jeffrey's mail, but it is intended to address the=20 > > > > entire discussion. > > > > > > > > There seem to be enough issues to sort out around the GAL/ACH=20 > > > > pair, and I was worried about a set of other indicators and the=20 > > > > data that they might want to put "after the BoS". So far I have=20 > > > > seen no real effort to address the interference's this might lead t= o. > > > > > > > > Further inline > > > > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > > >> Hi, > > > >> > > > >> It's not clear how we could put a GAL not at a BoS: > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | ACH = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | ACH TLV Header = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | = ~ > > > >> > > > >> ~ zero or more ACH TLVs = ~ > > > >> > > > >> ~ = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> | = ~ > > > >> > > > >> ~ G-ACh Message = ~ > > > >> > > > >> ~ = | > > > >> > > > >> > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > >> > > > >> Figure 2: G-ACh Packet Payload > > > >> > > > >> If the GAL does not have S-bit set, wouldn't a transit LSR=20 > > > >> treat any 4-ocet field (i.e. those in the above Figure) after=20 > > > >> that GAL as a > > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the=20 > > > >> label+TOS+S+transit > > > >> LSR will think the label stack ends there even though that's=20 > > > >> just part of the ACH. > > > >> > > > >> Or are you saying that a GAL not at the BoS will not have the=20 > > > >> ACH following it? > > > > > > > > Well, as far as I understand a GAL which does not have the=20 > > > > NoS-bit set will have other labels after itself. The BoS-bit=20 > > > > will be found deeper down stack and the ACH will immediately fo9llo= w the BoS. > > > > > > > > Yes there are issues here, but I'd like to see the DT address=20 > > > > multiple indicators in the stack and multiple sets of ancillary=20 > > > > data after the > > BoS. > > > > > > > > I think we need to nail down the relevant questiuons first, and=20 > > > > start working on solutions after that. > > > > > > > > /Loa > > > >> > > > >> Jeffrey > > > >> > > > >> *From:*mpls *On Behalf Of *Alexander=20 > > > >> Vainshtein > > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > > >> *To:* Stewart Bryant > > > >> *Cc:* mpls@ietf.org > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > > >> ancillary data after the BoS > > > >> > > > >> *[External Email. Be cautious of content]* > > > >> > > > >> Stewart, > > > >> > > > >> I fully agree with your statement that "an old implementation=20 > > > >> that received a ToS GAL not at BoS would at best throw an=20 > > > >> exception or worst be unpredictable". > > > >> > > > >> Regarding your statement "it is OK to have multiple GALs and=20 > > > >> GALs not at BoS IFF the creator of the LSP ensured that all=20 > > > >> LSRs on the LSP, including ECMP and FRR paths that found the=20 > > > >> GAL at ToS were known to be able to process it correctly": > > > >> > > > >> 1. I fully agree with this statement as a general restriction > > > >> 2. Quite a lot of things have to be done in order to make this > > > >> restriction work including at least: > > > >> > > > >> 1. The definition of correct processing of GAL at ToS but no= t at > > > >> BoS must be provided > > > >> 2. Advertisement of ability to process GAL not at BoS correc= tly in > > > >> IGP and BGP must be defined > > > >> 3. Ability to set up network-wide paths that only cross node= s that > > > >> process GAL correctly must be provided for different tech= niques > > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > > >> > > > >> It is still possible that, after all this work, we shall find=20 > > > >> out that the benefits of supporting GAL at ToS but not BoS will=20 > > > >> be only available in the networks where all the nodes support=20 > > > >> the new functionality because presence of non-supporting nodes=20 > > > >> imposes too many restrictions on connectivity and/or resilience. > > > >> > > > >> Regards, > > > >> > > > >> Sasha > > > >> > > > >> Office: +972-39266302 > > > >> > > > >> Cell: +972-549266302 > > > >> > > > >> Email: Alexander.Vainshtein@rbbn.com > > > > > > >> > > > >> *From:*Stewart Bryant > > >> > > > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > > >> *To:* Alexander Vainshtein > > >> > > > > >> *Cc:* Stewart Bryant > > >> >; gregory.mirsky@ztetx.com=20 > > > >> ; mpls@ietf.org=20 > > > >> > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and=20 > > > >> ancillary data after the BoS > > > >> > > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > > >> > > >> > wrote: > > > >> > > > >> While that might be the case, I think that the Open DT may gi= ve it a > > > >> try and investigate how the existing systems will handle GAL = being > > > >> not the BoS label. > > > >> > > > >> */[[Sasha]] Great minds think alike! One useful step could be > > > >> collecting the known actual behavior of popular implementatio= ns in > > > >> this case, say, by running a survey among the vendors - what = do you > > > >> think?/* > > > >> > > > >> That is actually a considerable amount of work that will take a wh= ile. > > > >> > > > >> It seems to me that an old implementation that received a ToS=20 > > > >> GAL not at BoS would at best throw an exception or worst be unpred= ictable. > > > >> > > > >> The original assumed processing model is to take the context of=20 > > > >> the PW label or PW+FAT label, discover the GAL and then process=20 > > > >> the GAL in the context of the PW label. > > > >> > > > >> When we extended GAL to apply to LSPs we again had the model=20 > > > >> that the GAL operated in the context of the LSP label that=20 > > > >> preceded it for context. It was still BoS. > > > >> > > > >> Putting the GAL further up the stack is a new behaviour. > > > >> > > > >> If it arrives at an LSR that knows the new semantic all is good. > > > >> > > > >> If it arrives at an LSR that does not know the new semantic=20 > > > >> then > > > >> > > > >> a) An error has occurred either in setting up the LSP, or in forwa= rding. > > > >> > > > >> b) The behaviour at the receiving node is unpredictable, but in=20 > > > >> any well written implementation should just result in the=20 > > > >> packet being dropped and counted as with any other Mal-formed pack= et. > > > >> > > > >> So I would think that it is OK to have multiple GALs and GALs=20 > > > >> not at BoS IFF the creator of the LSP ensured that all LSRs on=20 > > > >> the LSP, including ECMP and FRR paths that found the GAL at ToS=20 > > > >> were known to be able to process it correctly. > > > >> > > > >> A GAL not at BoS and not at ToS should not be inspected or=20 > > > >> processed by any LSR that did not know what it was doing, and=20 > > > >> to attempt to precess it would be a violation of the normal=20 > > > >> MPLS processing > > model. > > > >> > > > >> - Stewart > > > >> > > > >> > > > >> Notice: This e-mail together with any attachments may contain=20 > > > >> information of Ribbon Communications Inc. and its Affiliates=20 > > > >> that is confidential and/or proprietary for the sole use of the=20 > > > >> intended recipient. Any review, disclosure, reliance or=20 > > > >> distribution by others or forwarding without express permission=20 > > > >> is strictly prohibited. If you are not the intended recipient,=20 > > > >> please notify the sender immediately and then delete all=20 > > > >> copies, including > any attachments. > > > >> > > > >> > > > >> Juniper Business Use Only > > > >> > > > >> > > > >> _______________________________________________ > > > >> mpls mailing list > > > >> mpls@ietf.org > > > >> > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > ur > > > ld > > > > > > efense.com%2Fv3%2F__https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo% > > 2F > > > > > > mpls__%3B!!NEt6yM&data=3D04%7C01%7Chsong%40futurewei.com%7C08d72 > > 2072 > > > > > > 7794b6895f808d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1% > > 7C6 > > > > > > 37598622176314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC > > JQIjoi > > > > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DzE3QHyImI86j > > 7K > > > zn9PKE5qasAU01YKm%2FbbpXg6g4hAc%3D&reserved=3D0 > > > aO-gk!RVgTGVbknjgIjv3x- > > > q8ob1JglFKOP6qKkgAcCSPbeBMMj2AnexFnPevXopeK1a6u$ > > > >> > > > > > > > > -- > > > > > > > > Loa Andersson email: loa@pi.nu > > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > > > Juniper Business Use Only > > > > > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > > Senior MPLS Expert loa.pi.nu@gmail.com > > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > _______________________________________________ > > > mpls mailing list > > > mpls@ietf.org > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fw= ww. > > > > > > ietf.org%2Fmailman%2Flistinfo%2Fmpls&data=3D04%7C01%7Chsong%40futur > > e > > > > > > wei.com%7C08d7220727794b6895f808d934919550%7C0fee8ff2a3b240189c753a1 > > d5 > > > > > > 591fedc%7C1%7C1%7C637598622176324952%7CUnknown%7CTWFpbGZsb3d8e > > yJWIjoiM > > > > > > C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&am > > p;s > > > > > > data=3Db7TztzRbKspQdyrJ8%2Btps6IeLQlCl3E0mrgvJRydlTk%3D&reserved=3D0 > > > > > ______________________________________________________________________ > > ___________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations=20 > > confidentielles ou privilegiees et ne doivent donc pas etre=20 > > diffuses, exploites ou copies sans autorisation. Si vous avez recu=20 > > ce message par erreur, veuillez le signaler a l'expediteur et le=20 > > detruire ainsi que les pieces jointes. Les messages electroniques=20 > > etant susceptibles d'alteration, Orange decline toute responsabilite=20 > > si ce message a ete altere, > deforme ou falsifie. Merci. > > > > This message and its attachments may contain confidential or=20 > > privileged information that may be protected by law; they should not=20 > > be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender=20 > > and delete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that=20 > > have been modified, changed or falsified. > > Thank you. >=20 >=20 > ______________________________________________________________________ > ___________________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations=20 > confidentielles ou privilegiees et ne doivent donc pas etre diffuses,=20 > exploites ou copies sans autorisation. Si vous avez recu ce message=20 > par erreur, veuillez le signaler a l'expediteur et le detruire ainsi=20 > que les pieces jointes. Les messages electroniques etant susceptibles=20 > d'alteration, Orange decline toute responsabilite si ce message a ete alt= ere, deforme ou falsifie. Merci. >=20 > This message and its attachments may contain confidential or=20 > privileged information that may be protected by law; they should not=20 > be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and=20 > delete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have=20 > been modified, changed or falsified. > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou = copies sans autorisation. Si vous avez recu ce message par erreur, veuillez= le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Le= s messages electroniques etant susceptibles d'alteration, Orange decline to= ute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used= or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Wed Jun 23 05:42:10 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BBFDF3A36AA; Wed, 23 Jun 2021 05:42:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.799 X-Spam-Level: X-Spam-Status: No, score=-2.799 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8Rnz4f3rjRxp; Wed, 23 Jun 2021 05:42:02 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.70.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 247BE3A36A4; Wed, 23 Jun 2021 05:42:02 -0700 (PDT) Received: from opfednr07.francetelecom.fr (unknown [xx.xx.xx.71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by opfednr21.francetelecom.fr (ESMTP service) with ESMTPS id 4G92vq25NQz5wGD; Wed, 23 Jun 2021 14:41:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1624452119; bh=xJ+6H5C/t3ssUmr5klPiY20jKjGGnA4UatNXiMTSFYY=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=Rki++YzHgDL+fgSk87S+LPPw0fjeH9YCca5TiOSCLjlbLZVGrF6+ej6kzmzsx9dzP /K6lNOZAr/JuX6TheRZj6Xdo1CW9gZ7A2ZnJ1gnWTKcfA8+dP8PNTRiZVJqXyoR2TX jOkmp+cqtQZFa7PWc7SEnmFvV/T4SKNm80esrd7ceFsqMPLqH4v6VpKFc0PGvgrC7h /LwlO4UvYUcPx0XY4jbL2EcMPnJwt7MYOgcsTpLK4+Zt5sSNoYinY23XTgxf7hnLjv f20aoHCDf0FhNFH0R/46Gy4pfAw+RNiz6L17Cy0XX7X9c+8b72ENalA2Z8MpX2RhKt sx0quwc0IImYg== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opfednr07.francetelecom.fr (ESMTP service) with ESMTPS id 4G92vq1CjLzFpWX; Wed, 23 Jun 2021 14:41:59 +0200 (CEST) From: To: Haoyu Song , "draft-song-mpls-eh-indicator@ietf.org" CC: "mpls@ietf.org" , Loa Andersson , "Jeffrey (Zhaohui) Zhang" , Alexander Vainshtein , Stewart Bryant Thread-Topic: [mpls] Indicators in the stack and ancillary data after the BoS Thread-Index: AQHXZnp1KmXm0GDTTUWo1eOKTl9pvqseqjHAgAAA0ZCAAA1wYIAA+maAgAChoJCAATg4IA== Date: Wed, 23 Jun 2021 12:41:57 +0000 Message-ID: <30306_1624452119_60D32C17_30306_381_1_53C29892C857584299CBF5D05346208A4CDF64DD@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <202106170323552620410@zte.com.cn> <1bd54f43-880e-07f9-93cd-7d0aba9266d0@pi.nu> <23638_1624265401_60D052B9_23638_17_1_53C29892C857584299CBF5D05346208A4CDF1B34@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <14386_1624294152_60D0C307_14386_277_1_53C29892C857584299CBF5D05346208A4CDF30CC@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <17500_1624350791_60D1A047_17500_121_9_53C29892C857584299CBF5D05346208A4CDF3F3D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [mpls] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Jun 2021 12:42:08 -0000 Hi Haoyu, > -----Original Message----- > From: Haoyu Song [mailto:hsong@futurewei.com] > Hi Bruno, >=20 > Thanks for the response. > Just one clarification. What I mean for "forced binding" is that: EL and= EH are two > independent use cases but if we require encoding ELI to indicate EH, we n= eed > both in a packet which may not be necessary. Thanks for the clarification. Agreed. > In other words, if we don't need (or > support) EL at all, we still need to find another way to indicate EH. More simply, rather than defining and supporting another way, you need to s= upport/advertise the EL. Regards, Bruno >=20 > Regards, > Haoyu >=20 > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Tuesday, June 22, 2021 1:33 AM > To: Haoyu Song ; draft-song-mpls-eh-indicator@ietf.o= rg > Cc: mpls@ietf.org; Loa Andersson ; Jeffrey (Zhaohui) Zhang > ; Alexander Vainshtein ; > Stewart Bryant > Subject: RE: [mpls] Indicators in the stack and ancillary data after the = BoS >=20 > Hi Haoyu, >=20 > Thanks for replying. > Please see inline [Bruno] >=20 > > -----Original Message----- > > From: Haoyu Song [mailto:hsong@futurewei.com] > > Sent: Monday, June 21, 2021 7:44 PM > > To: DECRAENE Bruno INNOV/NET ; Loa > > Andersson ; Jeffrey (Zhaohui) Zhang ; > > Alexander Vainshtein ; Stewart Bryant > > ; draft-song-mpls-eh-indicator@ietf.org > > Cc: mpls@ietf.org > > Subject: RE: [mpls] Indicators in the stack and ancillary data after > > the BoS > > > > Hi Bruno, > > > > Thanks for the clarification. We might have some issues using the > > forced binding in some cases. > [Bruno] I'm not familiar with this 'forced binding' term. >=20 > > For example, in our EH architecture, we allow an EH to be inserted or > > removed at any nodes on an LSP. >=20 > [Bruno] As the thread is about EH _indicator_ I'll focus on the indicator= . Draft [1] > does not forbid the indicator to be modified en route. > [1] > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat= racker > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-label-i= d- > 01%23section- > 2&data=3D04%7C01%7Chsong%40futurewei.com%7Cc4ee94527683473cb22408 > d935586024%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759947595 > 4543231%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DpM57vSqNe51mL1P > GdXKahJjdyM6B1yzl23ftktvlYmQ%3D&reserved=3D0 >=20 > > Also, ELI+EI are two labels, which is more expensive than one SPL > > solution. >=20 > [Bruno] > It would be more expensive only in the case that EL is not needed/useful = AND that > one SPL be allocated for signaling the EH. > In all other cases, it's less expensive. >=20 >=20 > > Having said this, I could list your proposal as a possible solution. >=20 > [Bruno] OK. I believe it should, as per the abstract of draft-song-mpls-e= h-indicator >=20 >=20 > > BTW, Kireeti and I have discussed a possible option working in a differ= ent way. > > We would use a new SPL to indicate multiples things (also by encoding > > the unused TTL/CoS bits): the existence of other special labels in the > > label stack (e.g., ELI+EL) and the existence/location of extension > > headers after the label stack. Since we have a new SPL, we have more fr= eedom > to define its behavior. >=20 > [Bruno] Sure it also works. Different tradeoffs. >=20 > Best regards, > --Bruno >=20 > > > > Best, > > Haoyu > > > > -----Original Message----- > > From: bruno.decraene@orange.com > > Sent: Monday, June 21, 2021 9:49 AM > > To: Haoyu Song ; Loa Andersson ; > > Jeffrey > > (Zhaohui) Zhang ; Alexander Vainshtein > > ; Stewart Bryant > > ; draft-song-mpls-eh-indicator@ietf.org > > Cc: mpls@ietf.org > > Subject: RE: [mpls] Indicators in the stack and ancillary data after > > the BoS > > > > Hi Haoyu, > > > > > From: Haoyu Song [mailto:hsong@futurewei.com] > > > > > > Hi Bruno, > > > > > > For clarification, does it mean an entropy label must be present in t= he packet? > > > > Yes. (Both ELI and EL.) > > > > > What if it doesn't have such a label? > > > > The node requiring the indicator adds the Entropy Label (ELI, EL). I > > guess same principle as the other options discussed in the Figure 5 of > > draft-song-mpls-eh- indicator. > > In which case you get Entropy information for free (I mean no extra > > label). But from the entropy standpoint, it would be better to have > > the EL, ELI pushed by the ingress as this is the node which should have= the > most entropy information. > > > > Thanks, > > --Bruno > > > > > Thanks! > > > > > > Haoyu > > > > > > -----Original Message----- > > > From: bruno.decraene@orange.com > > > Sent: Monday, June 21, 2021 1:50 AM > > > To: Loa Andersson ; Jeffrey (Zhaohui) Zhang > > > ; Alexander Vainshtein > > > ; Stewart Bryant > > > ; draft-song-mpls-eh-indicator@ietf.org > > > Cc: mpls@ietf.org > > > Subject: RE: [mpls] Indicators in the stack and ancillary data after > > > the BoS > > > > > > [+ authors of draft-song-mpls-eh-indicator] > > > > > > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa > > > > Andersson > > > > > > > > Jeffrey, > > > > > > > > > > > > On 17/06/2021 17:01, Jeffrey (Zhaohui) Zhang wrote: > > > > > Hi Loa, > > > > > > > > > >> but I'd like to see the DT address multiple indicators in the > > > > >> stack and multiple > > > > sets of ancillary data after the BoS. > > > > > > > > > > I think the earlier emails of this email thread were talking > > > > > about multiple indicators > > > > in the stack; for multiple set of ancillary data after the BoS, > > > > either the extended ACH or the proposed MPLS/generic extension > > > > headers or a merge of those proposals should be able to handle it. > > > > This is alluded to the DataAfterBOS wiki page. > > > > > > > > hmm - yes partly, but there are several indicators proposed in > > > > several drafts > > > > > > > > draft-gandhi-mpls-ioam-sr has an E"E indicaor and an HBH > > > > indicator > > > > > > > > draft-kompella-mpls-mspl4fa make use of TC field and TTL of a > > > > special purpose label (FAI) as indicators > > > > > > > > there has also been discussion about putting more than one GAL > > > > in the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > > > draft-many-mpls-multiple-gal proposes to add a copy of the GAL > > > > higher uop the stack so that LSRs with a too shallow maximun > > > > readable depth might reach the GAL > > > > > > > > there has also been discussion about putting more than one GAL > > > > in the stack, i.e. differerent GALs pointing to different ACHs. > > > > > > > > draft-song-mpls-eh-indicator have a list of potential > > > > indicators, that is also telling if the EH should be processed on > > > > every EH capable node or "just" at ingress and egress > > > > > > The following draft proposes a way to carry indicators. > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fda > > > ta > > > tracker > > > .ietf.org%2Fdoc%2Fhtml%2Fdraft-decraene-mpls-slid-encoded-entropy-la > > > be > > > l- > > > id%23section- > > > > > > 2&data=3D04%7C01%7Chsong%40futurewei.com%7C08d7220727794b6895f808 > > > > > > d934919550%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C63759862217 > > > > > > 6314998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > > > > > > zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=3DVR7DCVMaNM8cGK > > > 0XuDLugXG6yP6jRYIlgbDuYrh%2B7uM%3D&reserved=3D0 > > > > > > It's short (less than one page) and backward compatible for LSR & LER. > > > > > > Referring to table 5 of draft-song-mpls-eh-indicator it also > > > - does not require additional label assuming Entropy Label is > > > already used for load balancing > > > - does not require an additional scarce resource (Special-Purpose > > > MPLS Label > > > value) > > > - allows location freedom > > > - does not need control plane extension > > > > > > Could the authors of draft-song-mpls-eh-indicator update their table > > > 5 in order to include the above draft? > > > > > > Thanks, > > > Regards, > > > --Bruno > > > > > > > > > > > The FAI might put ancillary data after the BoS. > > > > > > > > I think we need to have a comprehensive discussion > > > > > > > > - first what we want to have > > > > - second how when re-direct by an indicator we find the > > > > ancillary data that belongs to that indicator. > > > > > > > > /Loa > > > > > > > > > > > > > > > > > > > > > > > > > > Thanks. > > > > > > > > > > Jeffrey > > > > > > > > > > -----Original Message----- > > > > > From: Loa Andersson > > > > > Sent: Thursday, June 17, 2021 10:46 AM > > > > > To: Jeffrey (Zhaohui) Zhang ; Alexander > > > > > Vainshtein > > > > ; Stewart Bryant > > > > > > > > > Cc: mpls@ietf.org > > > > > Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and > > > > > ancillary data after > > > > the BoS > > > > > > > > > > [External Email. Be cautious of content] > > > > > > > > > > > > > > > DT, > > > > > > > > > > Responded to Jeffrey's mail, but it is intended to address the > > > > > entire discussion. > > > > > > > > > > There seem to be enough issues to sort out around the GAL/ACH > > > > > pair, and I was worried about a set of other indicators and the > > > > > data that they might want to put "after the BoS". So far I have > > > > > seen no real effort to address the interference's this might lead= to. > > > > > > > > > > Further inline > > > > > > > > > > > > > > > On 17/06/2021 16:15, Jeffrey (Zhaohui) Zhang wrote: > > > > >> Hi, > > > > >> > > > > >> It's not clear how we could put a GAL not at a BoS: > > > > >> > > > > >> > > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > >> > > > > >> | ACH = | > > > > >> > > > > >> > > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > >> > > > > >> | ACH TLV Header = | > > > > >> > > > > >> > > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > >> > > > > >> | = ~ > > > > >> > > > > >> ~ zero or more ACH TLVs = ~ > > > > >> > > > > >> ~ = | > > > > >> > > > > >> > > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > >> > > > > >> | = ~ > > > > >> > > > > >> ~ G-ACh Message = ~ > > > > >> > > > > >> ~ = | > > > > >> > > > > >> > > > > >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > >> > > > > >> Figure 2: G-ACh Packet Payload > > > > >> > > > > >> If the GAL does not have S-bit set, wouldn't a transit LSR > > > > >> treat any 4-ocet field (i.e. those in the above Figure) after > > > > >> that GAL as a > > > > >> label+TOS+S+TTL? If that 4-octet field has the S-bit set, the > > > > >> label+TOS+S+transit > > > > >> LSR will think the label stack ends there even though that's > > > > >> just part of the ACH. > > > > >> > > > > >> Or are you saying that a GAL not at the BoS will not have the > > > > >> ACH following it? > > > > > > > > > > Well, as far as I understand a GAL which does not have the > > > > > NoS-bit set will have other labels after itself. The BoS-bit > > > > > will be found deeper down stack and the ACH will immediately fo9l= low the > BoS. > > > > > > > > > > Yes there are issues here, but I'd like to see the DT address > > > > > multiple indicators in the stack and multiple sets of ancillary > > > > > data after the > > > BoS. > > > > > > > > > > I think we need to nail down the relevant questiuons first, and > > > > > start working on solutions after that. > > > > > > > > > > /Loa > > > > >> > > > > >> Jeffrey > > > > >> > > > > >> *From:*mpls *On Behalf Of *Alexander > > > > >> Vainshtein > > > > >> *Sent:* Thursday, June 17, 2021 5:07 AM > > > > >> *To:* Stewart Bryant > > > > >> *Cc:* mpls@ietf.org > > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > > > >> ancillary data after the BoS > > > > >> > > > > >> *[External Email. Be cautious of content]* > > > > >> > > > > >> Stewart, > > > > >> > > > > >> I fully agree with your statement that "an old implementation > > > > >> that received a ToS GAL not at BoS would at best throw an > > > > >> exception or worst be unpredictable". > > > > >> > > > > >> Regarding your statement "it is OK to have multiple GALs and > > > > >> GALs not at BoS IFF the creator of the LSP ensured that all > > > > >> LSRs on the LSP, including ECMP and FRR paths that found the > > > > >> GAL at ToS were known to be able to process it correctly": > > > > >> > > > > >> 1. I fully agree with this statement as a general restriction > > > > >> 2. Quite a lot of things have to be done in order to make this > > > > >> restriction work including at least: > > > > >> > > > > >> 1. The definition of correct processing of GAL at ToS but = not at > > > > >> BoS must be provided > > > > >> 2. Advertisement of ability to process GAL not at BoS corr= ectly in > > > > >> IGP and BGP must be defined > > > > >> 3. Ability to set up network-wide paths that only cross no= des that > > > > >> process GAL correctly must be provided for different te= chniques > > > > >> (RSVP-TE, SR-TE, FlexAlgo. BGP-LU etc.) > > > > >> > > > > >> It is still possible that, after all this work, we shall find > > > > >> out that the benefits of supporting GAL at ToS but not BoS will > > > > >> be only available in the networks where all the nodes support > > > > >> the new functionality because presence of non-supporting nodes > > > > >> imposes too many restrictions on connectivity and/or resilience. > > > > >> > > > > >> Regards, > > > > >> > > > > >> Sasha > > > > >> > > > > >> Office: +972-39266302 > > > > >> > > > > >> Cell: +972-549266302 > > > > >> > > > > >> Email: Alexander.Vainshtein@rbbn.com > > > > > > > > >> > > > > >> *From:*Stewart Bryant > > > >> > > > > > >> *Sent:* Thursday, June 17, 2021 10:36 AM > > > > >> *To:* Alexander Vainshtein > > > >> > > > > > >> *Cc:* Stewart Bryant > > > >> >; gregory.mirsky@ztetx.com > > > > >> ; mpls@ietf.org > > > > >> > > > > >> *Subject:* Re: [mpls] [EXTERNAL] Indicators in the stack and > > > > >> ancillary data after the BoS > > > > >> > > > > >> On 17 Jun 2021, at 07:45, Alexander Vainshtein > > > > >> > > > >> > wrote: > > > > >> > > > > >> While that might be the case, I think that the Open DT may = give it a > > > > >> try and investigate how the existing systems will handle GA= L being > > > > >> not the BoS label. > > > > >> > > > > >> */[[Sasha]] Great minds think alike! One useful step could = be > > > > >> collecting the known actual behavior of popular implementat= ions in > > > > >> this case, say, by running a survey among the vendors - wha= t do you > > > > >> think?/* > > > > >> > > > > >> That is actually a considerable amount of work that will take a = while. > > > > >> > > > > >> It seems to me that an old implementation that received a ToS > > > > >> GAL not at BoS would at best throw an exception or worst be > unpredictable. > > > > >> > > > > >> The original assumed processing model is to take the context of > > > > >> the PW label or PW+FAT label, discover the GAL and then process > > > > >> the GAL in the context of the PW label. > > > > >> > > > > >> When we extended GAL to apply to LSPs we again had the model > > > > >> that the GAL operated in the context of the LSP label that > > > > >> preceded it for context. It was still BoS. > > > > >> > > > > >> Putting the GAL further up the stack is a new behaviour. > > > > >> > > > > >> If it arrives at an LSR that knows the new semantic all is good. > > > > >> > > > > >> If it arrives at an LSR that does not know the new semantic > > > > >> then > > > > >> > > > > >> a) An error has occurred either in setting up the LSP, or in for= warding. > > > > >> > > > > >> b) The behaviour at the receiving node is unpredictable, but in > > > > >> any well written implementation should just result in the > > > > >> packet being dropped and counted as with any other Mal-formed pa= cket. > > > > >> > > > > >> So I would think that it is OK to have multiple GALs and GALs > > > > >> not at BoS IFF the creator of the LSP ensured that all LSRs on > > > > >> the LSP, including ECMP and FRR paths that found the GAL at ToS > > > > >> were known to be able to process it correctly. > > > > >> > > > > >> A GAL not at BoS and not at ToS should not be inspected or > > > > >> processed by any LSR that did not know what it was doing, and > > > > >> to attempt to precess it would be a violation of the normal > > > > >> MPLS processing > > > model. > > > > >> > > > > >> - Stewart > > > > >> > > > > >> > > > > >> Notice: This e-mail together with any attachments may contain > > > > >> information of Ribbon Communications Inc. and its Affiliates > > > > >> that is confidential and/or proprietary for the sole use of the > > > > >> intended recipient. 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From nobody Wed Jun 23 08:44:20 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 89DBA3A3BC7; Wed, 23 Jun 2021 08:44:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oDWqon08zsHw; Wed, 23 Jun 2021 08:44:15 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B3F433A3BC4; Wed, 23 Jun 2021 08:44:14 -0700 (PDT) Received: from [192.168.0.3] (c83-250-139-108.bredband.tele2.se [83.250.139.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 684FD348A80; Wed, 23 Jun 2021 17:44:11 +0200 (CEST) To: "mpls@ietf.org" Cc: "mpls-chairs@ietf.org" , DetNet Chairs , "pals-chairs@ietf.org" , "spring-chairs@ietf.org" From: Loa Andersson Message-ID: <42eeed69-d02c-a052-708f-fcc560674e23@pi.nu> Date: Wed, 23 Jun 2021 17:44:09 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] MPLS Open Design Team - Meeting 2021-06-24 Cancelled X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Jun 2021 15:44:20 -0000 Design Team, The Open Design Team 2021-06-24 is cancelled, next meeting will be 2021-07-01. /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Thu Jun 24 01:59:28 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 22A0D3A1239; Thu, 24 Jun 2021 01:59:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.895 X-Spam-Level: X-Spam-Status: No, score=-1.895 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Hir2GEHUlW9b; Thu, 24 Jun 2021 01:59:21 -0700 (PDT) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 580063A1235; Thu, 24 Jun 2021 01:59:20 -0700 (PDT) Received: from mse-fl1.zte.com.cn (unknown [10.30.14.238]) by Forcepoint Email with ESMTPS id 2A13094A73DE60DD9276; Thu, 24 Jun 2021 16:59:18 +0800 (CST) Received: from njxapp02.zte.com.cn ([10.41.132.201]) by mse-fl1.zte.com.cn with SMTP id 15O8ww8V036587; Thu, 24 Jun 2021 16:58:58 +0800 (GMT-8) (envelope-from peng.shaofu@zte.com.cn) Received: from mapi (njxapp05[null]) by mapi (Zmail) with MAPI id mid201; Thu, 24 Jun 2021 16:58:57 +0800 (CST) Date: Thu, 24 Jun 2021 16:58:57 +0800 (CST) X-Zmail-TransId: 2afd60d4495143757c5f X-Mailer: Zmail v1.0 Message-ID: <202106241658577006127@zte.com.cn> In-Reply-To: References: 202106112031367205917@zte.com.cn, SA1PR05MB8439210F4F602E99F7C42693AF0E9@SA1PR05MB8439.namprd05.prod.outlook.com, SA1PR05MB84392B8D104C78248C787432AF0E9@SA1PR05MB8439.namprd05.prod.outlook.com Mime-Version: 1.0 From: To: Cc: , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-fl1.zte.com.cn 15O8ww8V036587 Archived-At: Subject: Re: [mpls] =?utf-8?q?MPLS-RT_review_for_draft-rathi-mpls-egress-tlv-?= =?utf-8?q?for-nil-fec?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Jun 2021 08:59:26 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Deepti, Sorry that not reply in time due to other delays. Please see inline [PSF] Regards, PSF ------------------原始邮件------------------ 发件人：DeeptiRathi 收件人：彭少富10053815; 抄送人：draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org;mpls-chairs@ietf.org;mach.chen@huawei.com;mpls@ietf.org; 日 期 ：2021年06月17日 22:19 主 题 ：Re: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec Hi Shaofu, Please find my comments inline. I will update draft accordingly. Regards, Deepti Juniper Business Use Only -----Original Message----- From: peng.shaofu@zte.com.cn Sent: Friday, June 11, 2021 6:02 PM To: draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org; mpls-chairs@ietf.org; mach.chen@huawei.com Cc: mpls@ietf.org Subject: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec [External Email. Be cautious of content] Dear authors, chairs and secretary, I was selected to review this document. The following are my comments, which are only based on my current understanding. If there are any mistakes, please forgive and correct me. >1) I agree with the problem background described in section "2. Problem with nil FEC", the challenges and risks brought by using Nil FEC in some scenarios. For example, when SR policy is manually >configured (or distributed by BGP) and segment type is specified as label type, the headend does not know the detailed FEC information for each segment. At this time, we can choose to include Nil FEC in >the FEC stack of echo request. IMO, No matter which layer of FEC stack a Nil FEC is placed, it means that we lose the FEC Validation for this layer, that is, we can not determine whether the node to which an >echo request packet arrives is the expected transit node or egress node of MPLS LSP. [Deepti]:Yes, its as describe in section 4.4.1 of RFC8029 : .. If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely. .. In RFC 8029 assumes there are other FECs along with NIL-FEC in the target FEC-stack. This draft uses single NIL FEC for complete label stack. So no validation will be performed on any transit node and adding EGRESS TLV a minimal validation is provided at egress. Thus it can be used to check any combination of segments on any path without upgrading transit nodes. I will update abstract and introduction to make it clear that document uses single NIL FEC for complete label stack. [PSF] Thanks, the clarification is benefit for developers to implement this function. For the clarification itself, however, I may have different understanding of section 4.4.1 of RFC8029 from yours. IMO, section 4.4.1 of RFC8029 is a sub-function called by transit processing (see 4. Label Operation Check) or egress processing (see 5. Egress Processing). For example, during egress processing, this sub-function may be called multiple times. The annotation "If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely." in this sub-function may means, if I understand correctly, just skip FEC checking for current Label-L and the FEC at FEC-stack-depth, but not break the parent processing and stop to check the next label and FEC element (if they all exist). So that if we use a single Nil FEC for complete label stack, no validation will be performed on any transit node just because of no FEC element in FEC-stack-depth, but not because of the above annotation. Right ? >2) Therefore, I think the egress TLV introduced in this document only has positive significance for PING mode, but has little significance for TRACEROUTE mode. According to RFC8029, PING mode is used to >detect that the packets reache the expected egress node, while TRACEROUTE mode is in addition used to detect that the packets reache the expected transit node. It seems that, in the last sentence of >section 2, the expression is inaccurate. In fact, there is no benefit to the processing of transit nodes. [Deepti] RFC 8029 traceroute procedure validates the FEC on each transit node. Procedure describe in this draft using NIL FEC + EGRESS TLV, does not validate the transit path. Every visited transit node in the path gets reported on ingress node. This information can be used by offline application to validate the traceroute path. >3) If we focus on the benefits of egress TLV for PING mode, it seems that we can achieve the same effect by using the existing generic IP prefix FEC, which can be used to determine whether the PING packets >have reached the desired destination node. This may be the necessary to consider the introduction of egress TLV in this document, that is, "Nil FEC + egress TLV" compared with "generic IP prefix FEC", >provides the ability that the latter can not provide? Of course, these two options can coexist. If Nil FEC is selected, then the egress TLV is very useful. [Deepti]: Yes, both FEC can co-exists. The generic IPv4 and IPv6 prefix sub-TLVs are used when the protocol that is advertising the label is unknown. For these sub-TLVs the information that is carried is the IPv4 or IPv6 prefix and prefix length. Thus Generic FEC types perform an additional control plane validation. The details of generic FEC and validation procedures are not very detailed in the RFC 8029.The use-case mostly specifies inter-AS VPNs as the motivation. NIL FEC is used to traverse the path without validation for cases where the FEC is not defined or routers are not upgraded to support the new FECs (like newer features, explicit-null, router-alert etc). Thus it can be used to check any combination of segments on any data path which cant be said for generic FEC. Certain aspects of Segment Routing such as anycast SIDs required clear guideline on how the validation procedure should work. Also Generic FEC may not be widely supported and if transit routers are not upgraded to support validation of generic FEC, traceroute may fail. So instead of adding such clarifications to generic FEC, adding new EGRESS TLV in Nil FEC was better option with minimal Its an optional TLV so the procedures will work fine even if transit routers are not upgraded. While we clearly specify the processing of egress tlv so that all SR cases are well specified. Since explicit Path can be created using node-sid, adj-sid, binding-sid, anycast-sids etc. EGRESS TLV prefix will be derived from path egress/destination and not based on labels used in the path to reach the destination. I will update same in draft. [PSF] Agree. Nil FEC has a little more scenarios than generic IP prefix FEC can apply, even though they are all designed for incomplete scenes. For example, if the last label is adj-sid, we can still use Nil FEC but not generic IP prefix FEC. >4) According to RFC8287, PING mode can only contain a single Nil FEC corresponding to last segment, while TRACEROUTE mode must contain Nil FEC corresponding to each segment. Therefore, I am a little >confused that the TRACEROUTE mode described in section "4.1. Sending Egress TLV in MPLS Echo Request" in this document only contains a single Nil FEC. Can authors indicate me which document you >refer to? Although, the number of elements in FEC stack (for example, only a single Nil FEC) may be inconsistent with the number of elements in DDMAP label stack (for example, including the whole >outgoing label stack corresponding to SID list), the traceroute processing described in RFC8029 does support this situation. My worry is that it will bring risks related with the transit node's reply of FEC >change. In this case, it seems that FEC change can not be replied from the transit node, or the FEC change replies from the transit node needs to be ignored on the initiator node, otherwi se th e subsequent >FEC validation will be wrong. This need to supplement and further clarify the processing. >For example, according to RFC8287, when the transit segment node replies the FEC change POP prefix-SID, how does the initiator handle it? Will the single Nil FEC be removed from the FEC stack? When the >transit node replies to FEC change PUSH (for example, prefix SID enters the outer RSVP-TE forwarding adjacency), how does the initiator handle it? Will RSVP FEC be added to the FEC stack? This issue seems >to also exist in non segment routing case, such as traceroute a BGP LU LSP, assuming LU over LDP, but the initiator only inserts a single BGP-LU FEC in the FEC stack. When the echo request packet arrives at a >transit node of LDP LSP, it found that it need to enter an outer uniform RSVP-TE LSP. At this time, if the transit node replys FEC change PUSH RSVP FEC, it will bring risk, because the FEC stack of the next echo >request is , while the label stack of DDMAP is < BGP, LDP, RSVP >, I doubt whether the subsequent reply of "IS egress" of TE LSP can successfully remov e the RSVP FEC element from the FEC >stack. [Deepti] As describe in section 4.4.1 of RFC8029 : .. If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely. .. In RFC 8029 assumes there are other FECs along with NIL-FEC in the target FEC-stack. This draft uses single NIL FEC for complete label stack which will get removed only at egress and hence FEC validation will be skipped over complete path. So ingress/initiator will never get FEC-stack change. I will update draft with this information to make it clear. [PSF] My doubts are the same as above, i.e., the above annotation may be to say that FEC checking for the current Label-L and the FEC at FEC-stack-depth is skipped completely, but not the entire FEC stack. And, according to 4.5.1 or 4.5.2 of RFC8029, it seems that FEC stack change is enclosed in echo reply message without dependency on FEC validation skipped or successfully checked. If that is true, for traceroute mode, a single Nil FEC may bring risks. Hope to see the updated version to give readers more information for this risk. 5) Others: There is a spelling error in the example, egress router R3 should be changed to R7. [Deepti] I will update the draft for all these errors. My conclusion: In Ping mode, egress TLV is useful to be combined with Nil FEC. It offers an alternative to generic IP prefix FEC. Regards, PSF --=====_003_next=====-- --=====_001_next=====-- From nobody Fri Jun 25 01:52:39 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35E9E3A0AF4; Fri, 25 Jun 2021 01:52:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S83I_yjZfRsR; Fri, 25 Jun 2021 01:52:32 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 636FD3A0AEE; Fri, 25 Jun 2021 01:52:32 -0700 (PDT) Received: from [192.168.1.224] (90-231-104-158-no93.tbcn.telia.com [90.231.104.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 29A93348AE3; Fri, 25 Jun 2021 10:52:29 +0200 (CEST) To: "mpls@ietf.org" Cc: "mpls-chairs@ietf.org" , "pals-chairs@ietf.org" , Kireeti Kompella From: Loa Andersson Message-ID: Date: Fri, 25 Jun 2021 10:52:28 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Question and concerns about the FAI X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Jun 2021 08:52:37 -0000 Design Team, Kireeti, I added two concerns and one question to the wiki: https://trac.ietf.org/trac/mpls/wiki/LabelStack /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Sun Jun 27 01:37:52 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9B4573A20F8; Sun, 27 Jun 2021 01:37:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.235 X-Spam-Level: X-Spam-Status: No, score=-2.235 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, NICE_REPLY_A=-0.338, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rFlpPVIqBNWD; Sun, 27 Jun 2021 01:37:46 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AB1F13A20F7; Sun, 27 Jun 2021 01:37:45 -0700 (PDT) Received: from [192.168.1.224] (90-231-104-158-no93.tbcn.telia.com [90.231.104.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id BCBE8348B49; Sun, 27 Jun 2021 10:37:41 +0200 (CEST) From: Loa Andersson To: "mpls@ietf.org" , Kireeti Kompella Cc: "pals-chairs@ietf.org" , "mpls-chairs@ietf.org" References: Message-ID: Date: Sun, 27 Jun 2021 10:37:11 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [mpls] Question and concerns about the FAI X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 27 Jun 2021 08:37:51 -0000 Design Team, Kireeti, I have added a further question in the same part of the wiki, on the H-bit. /Loa On 25/06/2021 10:52, Loa Andersson wrote: > Design Team, Kireeti, > > I added two concerns and one question to the wiki: > > https://trac.ietf.org/trac/mpls/wiki/LabelStack > > /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Jun 28 02:58:58 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3698E3A337F; Mon, 28 Jun 2021 02:58:55 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DQoNCk15IGNvbmNsdXNpb246IEluIFBpbmcgbW9kZSwgZWdyZXNzIFRMViBpcyB1c2VmdWwgdG8g YmUgY29tYmluZWQgd2l0aCBOaWwgRkVDLiBJdCBvZmZlcnMgYW4gYWx0ZXJuYXRpdmUgdG8gZ2Vu ZXJpYyBJUCBwcmVmaXggRkVDLg0KDQpSZWdhcmRzLA0KUFNGDQo= From nobody Mon Jun 28 04:35:44 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3A03D3A362A; Mon, 28 Jun 2021 04:35:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Oiu08nZc5DfV; Mon, 28 Jun 2021 04:35:38 -0700 (PDT) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D456C3A3629; Mon, 28 Jun 2021 04:35:37 -0700 (PDT) Received: from mse-fl1.zte.com.cn (unknown [10.30.14.238]) by Forcepoint Email with ESMTPS id 2559D1FE4837E6D904DC; Mon, 28 Jun 2021 19:16:45 +0800 (CST) Received: from njxapp01.zte.com.cn ([10.41.132.200]) by mse-fl1.zte.com.cn with SMTP id 15SBGRfs003952; Mon, 28 Jun 2021 19:16:27 +0800 (GMT-8) (envelope-from peng.shaofu@zte.com.cn) Received: from mapi (njxapp05[null]) by mapi (Zmail) with MAPI id mid201; Mon, 28 Jun 2021 19:16:27 +0800 (CST) Date: Mon, 28 Jun 2021 19:16:27 +0800 (CST) X-Zmail-TransId: 2afd60d9af8bfd11df4b X-Mailer: Zmail v1.0 Message-ID: <202106281916275814582@zte.com.cn> In-Reply-To: References: 202106112031367205917@zte.com.cn, 202106241658577006127@zte.com.cn, SA1PR05MB843949BCDADA6FDB3289358BAF039@SA1PR05MB8439.namprd05.prod.outlook.com Mime-Version: 1.0 From: To: Cc: , , , Content-Type: multipart/mixed; boundary="=====_001_next=====" X-MAIL: mse-fl1.zte.com.cn 15SBGRfs003952 Archived-At: Subject: Re: [mpls] =?utf-8?q?MPLS-RT_review_for_draft-rathi-mpls-egress-tlv-?= =?utf-8?q?for-nil-fec?= X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Jun 2021 11:35:43 -0000 --=====_001_next===== Content-Type: multipart/alternative; boundary="=====_003_next=====" --=====_003_next===== Content-Type: text/plain; charset="UTF-8" Hi Deepti, Thanks for your reply. I have no more questions. Regards, PSF ------------------原始邮件------------------ 发件人：DeeptiRathi 收件人：彭少富10053815; 抄送人：draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org;mpls-chairs@ietf.org;mach.chen@huawei.com;mpls@ietf.org; 日 期 ：2021年06月28日 17:58 主 题 ：RE: Re:MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec Hi Shaofu, Please see inline with tag "[[Deepti]]". Soon will update the draft with all these needed info. Regards, Deepti Juniper Business Use Only -----Original Message----- From: peng.shaofu@zte.com.cn Sent: Thursday, June 24, 2021 2:29 PM To: Deepti Rathi Cc: draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org; mpls-chairs@ietf.org; mach.chen@huawei.com; mpls@ietf.org Subject: Re:MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec [External Email. Be cautious of content] Hi Deepti, Sorry that not reply in time due to other delays. Please see inline [PSF] Regards, PSF ------------------原始邮件------------------ 发件人：DeeptiRathi 收件人：彭少富10053815; 抄送人：draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org;mpls-chairs@ietf.org;mach.chen@huawei.com;mpls@ietf.org; 日 期 ：2021年06月17日 22:19 主 题 ：Re: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec Hi Shaofu, Please find my comments inline. I will update draft accordingly. Regards, Deepti Juniper Business Use Only -----Original Message----- From: peng.shaofu@zte.com.cn Sent: Friday, June 11, 2021 6:02 PM To: draft-rathi-mpls-egress-tlv-for-nil-fec@ietf.org; mpls-chairs@ietf.org; mach.chen@huawei.com Cc: mpls@ietf.org Subject: MPLS-RT review for draft-rathi-mpls-egress-tlv-for-nil-fec [External Email. Be cautious of content] Dear authors, chairs and secretary, I was selected to review this document. The following are my comments, which are only based on my current understanding. If there are any mistakes, please forgive and correct me. >1) I agree with the problem background described in section "2. Problem with nil FEC", the challenges and risks brought by using Nil FEC in some scenarios. For example, when SR policy is manually >configured (or distributed by BGP) and segment type is specified as label type, the headend does not know the detailed FEC information for each segment. At this time, we can choose to include Nil FEC in >the FEC stack of echo request. IMO, No matter which layer of FEC stack a Nil FEC is placed, it means that we lose the FEC Validation for this layer, that is, we can not determine whether the node to which an >echo request packet arrives is the expected transit node or egress node of MPLS LSP. [Deepti]:Yes, its as describe in section 4.4.1 of RFC8029 : . If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely. . In RFC 8029 assumes there are other FECs along with NIL-FEC in the target FEC-stack. This draft uses single NIL FEC for complete label stack. So no validation will be performed on any transit node and adding EGRESS TLV a minimal validation is provided at egress. Thus it can be used to check any combination of segments on any path without upgrading transit nodes. I will update abstract and introduction to make it clear that document uses single NIL FEC for complete label stack. [PSF] Thanks, the clarification is benefit for developers to implement this function. For the clarification itself, however, I may have different understanding of section 4.4.1 of RFC8029 from yours. IMO, section 4.4.1 of RFC8029 is a sub-function called by transit processing (see 4. Label Operation Check) or egress processing (see 5. Egress Processing). For example, during egress processing, this sub-function may be called multiple times. The annotation "If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely." in this sub-function may means, if I understand correctly, just skip FEC checking for current Label-L and the FEC at FEC-stack-depth, but not break the parent processing and stop to check the next label and FEC element (if they all exist). So that if we use a single Nil FEC for complete label stack, no validation will be performed on any transit node just because of no FEC element in FEC-stack-depth, but not because of the above annotation. Right ? [[Deepti]] Yes. >2) Therefore, I think the egress TLV introduced in this document only has positive significance for PING mode, but has little significance for TRACEROUTE mode. According to RFC8029, PING mode is used to >detect that the packets reache the expected egress node, while TRACEROUTE mode is in addition used to detect that the packets reache the expected transit node. It seems that, in the last sentence of >section 2, the expression is inaccurate. In fact, there is no benefit to the processing of transit nodes. [Deepti] RFC 8029 traceroute procedure validates the FEC on each transit node. Procedure describe in this draft using NIL FEC + EGRESS TLV, does not validate the transit path. Every visited transit node in the path gets reported on ingress node. This information can be used by offline application to validate the traceroute path. >3) If we focus on the benefits of egress TLV for PING mode, it seems that we can achieve the same effect by using the existing generic IP prefix FEC, which can be used to determine whether the PING packets >have reached the desired destination node. This may be the necessary to consider the introduction of egress TLV in this document, that is, "Nil FEC + egress TLV" compared with "generic IP prefix FEC", >provides the ability that the latter can not provide? Of course, these two options can coexist. If Nil FEC is selected, then the egress TLV is very useful. [Deepti]: Yes, both FEC can co-exists. The generic IPv4 and IPv6 prefix sub-TLVs are used when the protocol that is advertising the label is unknown. For these sub-TLVs the information that is carried is the IPv4 or IPv6 prefix and prefix length. Thus Generic FEC types perform an additional control plane validation. The details of generic FEC and validation procedures are not very detailed in the RFC 8029.The use-case mostly specifies inter-AS VPNs as the motivation. NIL FEC is used to traverse the path without validation for cases where the FEC is not defined or routers are not upgraded to support the new FECs (like newer features, explicit-null, router-alert etc). Thus it can be used to check any combination of segments on any data path which cant be said for generic FEC. Certain aspects of Segment Routing such as anycast SIDs required clear guideline on how the validation procedure should work. Also Generic FEC may not be widely supported and if transit routers are not upgraded to support validation of generic FEC, traceroute may fail. So instead of adding such clarifications to generic FEC, adding new EGRESS TLV in Nil FEC was better option with minimal Its an optional TLV so the procedures will work fine even if transit routers are not upgraded. While we clearly specify the processing of egress tlv so that all SR cases are well specified. Since explicit Path can be created using node-sid, adj-sid, binding-sid, anycast-sids etc. EGRESS TLV prefix will be derived from path egress/destination and not based on labels used in the path to reach the destination. I will update same in draft. [PSF] Agree. Nil FEC has a little more scenarios than generic IP prefix FEC can apply, even though they are all designed for incomplete scenes. For example, if the last label is adj-sid, we can still use Nil FEC but not generic IP prefix FEC. >4) According to RFC8287, PING mode can only contain a single Nil FEC >corresponding to last segment, while TRACEROUTE mode must contain Nil >FEC corresponding to each segment. Therefore, I am a little >confused >that the TRACEROUTE mode described in section "4.1. Sending Egress TLV >in MPLS Echo Request" in this document only contains a single Nil FEC. >Can authors indicate me which document you >refer to? Although, the >number of elements in FEC stack (for example, only a single Nil FEC) >may be inconsistent with the number of elements in DDMAP label stack >(for example, including the whole >outgoing label stack corresponding >to SID list), the traceroute processing described in RFC8029 does >support this situation. My worry is that it will bring risks related >with the transit node's reply of FEC >change. In this case, it seems >that FEC change can not be replied from the transit node, or the FEC >change replies from the transit node needs to be ignored on the >initiator node, otherwi se th e subsequent >FEC validation will be wrong. This need to supplement and further clarify the processing. >For example, according to RFC8287, when the transit segment node >replies the FEC change POP prefix-SID, how does the initiator handle >it? Will the single Nil FEC be removed from the FEC stack? When the >>transit node replies to FEC change PUSH (for example, prefix SID >enters the outer RSVP-TE forwarding adjacency), how does the initiator >handle it? Will RSVP FEC be added to the FEC stack? This issue seems >>to also exist in non segment routing case, such as traceroute a BGP LU >LSP, assuming LU over LDP, but the initiator only inserts a single >BGP-LU FEC in the FEC stack. When the echo request packet arrives at a >>transit node of LDP LSP, it found that it need to enter an outer >uniform RSVP-TE LSP. At this time, if the transit node replys FEC >change PUSH RSVP FEC, it will bring risk, because the FEC stack of the >next echo >request is , while the label stack of DDMAP is < >BGP, LDP, RSVP >, I doubt whether the subsequent reply of "IS egress" >of TE LSP can successfully remov e the RSVP FEC element from the FEC >stack. [Deepti] As describe in section 4.4.1 of RFC8029 : . If the outermost FEC of the Target FEC stack is the Nil FEC, then the node MUST skip the Target FEC validation completely. . In RFC 8029 assumes there are other FECs along with NIL-FEC in the target FEC-stack. This draft uses single NIL FEC for complete label stack which will get removed only at egress and hence FEC validation will be skipped over complete path. So ingress/initiator will never get FEC-stack change. I will update draft with this information to make it clear. [PSF] My doubts are the same as above, i.e., the above annotation may be to say that FEC checking for the current Label-L and the FEC at FEC-stack-depth is skipped completely, but not the entire FEC stack. And, according to 4.5.1 or 4.5.2 of RFC8029, it seems that FEC stack change is enclosed in echo reply message without dependency on FEC validation skipped or successfully checked. If that is true, for traceroute mode, a single Nil FEC may bring risks. Hope to see the updated version to give readers more information for this risk. [[Deepti]] This single NIL FEC based traceroute is being proposed mostly for SR-TE paths especially when labels such as static/LSP label, Binding-SID, EPE-SID etc are used in label stack. It may not be possible to derive the FEC of these labels (non-IGP labels) on the headend of the router when the SR-TE path is created by the controller. In such situations, Nil FEC based traceroute will help to trace the path. 5) Others: There is a spelling error in the example, egress router R3 should be changed to R7. [Deepti] I will update the draft for all these errors. My conclusion: In Ping mode, egress TLV is useful to be combined with Nil FEC. It offers an alternative to generic IP prefix FEC. Regards, PSF --=====_003_next=====-- --=====_001_next=====-- From nobody Mon Jun 28 10:55:08 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8CC273A12EA; Mon, 28 Jun 2021 10:55:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L2f6BuS5aWm6; Mon, 28 Jun 2021 10:55:01 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7622A3A12E7; Mon, 28 Jun 2021 10:55:01 -0700 (PDT) Received: from [192.168.1.224] (90-231-104-158-no93.tbcn.telia.com [90.231.104.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 88283348B9F; Mon, 28 Jun 2021 19:54:59 +0200 (CEST) To: "mpls@ietf.org" Cc: "mpls-chairs@ietf.org" , "pals-chairs@ietf.org" , DetNet Chairs , "spring-chairs@ietf.org" From: Loa Andersson Message-ID: Date: Mon, 28 Jun 2021 19:54:57 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [mpls] Open Design Team online meeting on Thursday (2021-07-01 ) X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Jun 2021 17:55:07 -0000 Open Design Team, I have uploaded the agenda for the meeting on Thursday. https://trac.ietf.org/trac/mpls/wiki/2021-07-01-agenda /Loa -- Loa Andersson email: loa@pi.nu Senior MPLS Expert loa.pi.nu@gmail.com Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Wed Jun 30 11:23:27 2021 Return-Path: X-Original-To: mpls@ietfa.amsl.com Delivered-To: mpls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C82093A258A; 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Wed, 30 Jun 2021 11:23:12 -0700 (PDT) MIME-Version: 1.0 Reply-To: david.sinicrope@gmail.com From: David Sinicrope Date: Wed, 30 Jun 2021 14:23:01 -0400 Message-ID: To: pals@ietf.org, mpls@ietf.org, detnet@ietf.org Content-Type: multipart/alternative; boundary="000000000000baff9605c5ffd0af" Archived-At: Subject: [mpls] IETF 111 PALS, MPLS, DETNET Joint Session - Slot Request X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Jun 2021 18:23:21 -0000 --000000000000baff9605c5ffd0af Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi All, The draft agenda for IETF111 has been posted - https://datatracker.ietf.org/meeting/111/agenda PALS has a joint session with the MPLS and DetNet WGs, focusing on cross-gr= oup MPLS issues: TUESDAY, July 27, 2021 Session III Start: 16:00 PDT/19:00 EDT/23:00 UTC Room 6 RTG pals Pseudowire And LDP-enabled Services WG - Joint PALS/MPLS/DetNet The PALS chairs and I(PALS Secretary)are coordinating the agenda for this session. This will be a fully remote meeting. Our plan is to focus on summarizing progress from the Open MPLS Design Team, updates and progress on the cross-group MPLS issues. Please send slot requests via *reply to this email* (i.e., to david.sinicrope@gmail.com) *with the Subject intact* before the end of the day Sunday, July 11 (any TZ). Please include the following in your request= : 1. Topic: (e.g., =E2=80=9CPW Control Word Stitching=E2=80=9D) 2. URL to your draft on Datatracker: you only need to provide the file name to the example URL (e.g., =E2=80=9C http://datatracker.ietf.org/doc/draft-ietf-pwe3-mpls-eth-oam-iwk/=E2=80=9D)= : 3. Brief statement of objectives and issues to be discussed and resolved via the presentation during the meeting: (e.g., =E2=80=9CGather interest from the WG to work on this solution=E2=80=9D) 4. Requested duration: (norm/default is 10 min): =E2=80=9C20 min=E2=80=9D 5. Speaker name: (e.g., =E2=80=9CDave SINICROPE=E2=80=9D): Thank you! Dave Sinicrope PALS Secretary david.sinicrope@gmail.com --000000000000baff9605c5ffd0af Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi All,


The draft agenda for IETF111 has been posted -

https://datatracke= r.ietf.org/meeting/111/agenda


PALS has a joint session with the M= PLS and DetNet WGs, focusing on cross-group MPLS issues:


TUESDAY, July 27, 2= 021 Session III=C2=A0

Start: 16:00 PDT/19:00 = EDT/23:00 UTC

Room 6=C2=A0 RTG pals=C2=A0 Pseudowire And LDP-enabled Service= s WG - Joint PALS/MPLS/DetNet


The PALS chairs and I(PALS Secretary)ar= e coordinating the agenda for this session.


This will be a fully remo= te meeting.=C2=A0 Our plan is to focus on summarizing progress from the Ope= n MPLS Design Team, updates and progress on the cross-group MPLS issues.


Please send slot requests via reply to this email (i.e., to david.sinicrope@gmail.com) = with the Subject intact before the end of the day Sunday, July 11 (any TZ).=C2= =A0 Please include the following in your request:


1. Topic: (e.g., =E2=80=9CPW= Control Word Stitching=E2=80=9D)

=C2=A0

2. URL to your draft on Data= tracker: you only need to provide the file name to the example URL (e.g., = =E2=80=9Chttp://datatracker.ietf.org/doc/draft-ietf-pwe3-mpls-eth-oam-iw= k/=E2=80=9D):=C2=A0=C2=A0=C2=A0


3. Brief statement of objectives = and issues to be discussed and resolved via the presentation during the mee= ting:=C2=A0 (e.g.,

=E2=80=9CGather interest from the WG to work on this s= olution=E2=80=9D)

=C2=A0

4. Requested duration: (norm/default is 10 min= ): =E2=80=9C20 min=E2=80=9D

=C2=A0

5. Speaker name: <Given-name FAMI= LY-NAME-IN-ALL-CAPS> (e.g., =E2=80=9CDave SINICROPE=E2=80=9D):=C2=A0=C2= =A0


Thank you!

Dave Sinicrope

PALS Secretary

david.sinicrope@gmail.co= m
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mlxlogscore=999 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106300118 Archived-At: Subject: Re: [mpls] [EXTERNAL] Indicators in the stack and ancillary data after the BoS X-BeenThere: mpls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Multi-Protocol Label Switching WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Jun 2021 21:26:26 -0000 SGksDQoNClBhcmRvbiBtZSB0aGF0IEkgd2FzIG5vdCBhYmxlIHRvIHRpbWVseSBmb2xsb3cgdGhl IGRpc2N1c3Npb25zLiBJIGFtIHNsb3dseSBjYXRjaGluZyB1cCAtIHBsZWFzZSBhbGxvdyBtZSB0 byByZXBseSB0byB0aGlzIG9sZCBlbWFpbCBldmVuIHRob3VnaCB0aGVyZSB3ZXJlIGEgbG90IG9m IG5ld2VyIG9uZXMgYmVjYXVzZSB0aGlzIG9uZSBoYXMgYmV0dGVyIGNvbnRleHQgdGhhbiBsYXR0 ZXIgZGVlcGx5LW5lc3RlZCBlbWFpbC4gSG93ZXZlciBJIHdpbGwgcmVmZXIgdG8gc29tZSBsYXR0 ZXIgZW1haWwgaW4gdGhpcyByZXBseS4NCg0KUGxlYXNlIHNlZSB6emg+IGJlbG93Lg0KDQotLS0t 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