Subject: Re: [6lo] I-D Action: draft-li-6lo-native-short-address-01.txt

From: Peng Liu<[email-masked]>
Date: 18 Feb 2022 18:39:08 +0800

1111MicrosoftInternetExplorer402DocumentNotSpecified7.8 磅Normal0                                                                                                                                                                                                                                                                  

Hi All,

The hackathon project is good start to evaluate efficiency of NSA allocation functions. Any one can provide a topology for short address assignment.  

From the perspective of operators, also working in how to make proper use of IP addresses in more scenarios. it's a good way to apply the short IP addresses without the unnecessary routing function in IoT, so welcome anyone who are interested in the hackathon and drafts.

Regards，

Peng

Peng Liu | 刘鹏

China Mobile | 移动研究院

mobile phone：13810146105

email:  [email-masked]

发件人: Luigi Iannone

时间: 2022/02/17(星期四)16:25

收件人: 6lo;

抄送人: draft-li-6lo-native-short-address;

主题: Re: [6lo] I-D Action: draft-li-6lo-native-short-address-01.txtHi All, A short follow-up on the progress of NSA. As stated in my last email we are working on a simulation tool to evaluate NSA and compare it to other solution.The work is progressing steadily and we registered to the hackathon @ IETF 113 Please see: https://trac.ietf.org/trac/ietf/meeting/wiki/113hackathon

 Anybody interested is more than welcome to participate.(and BTW we also welcome more feedback on the draft ;-) ) See you in Wien (in person or remotely) Ciao L.

On 14 Jan 2022, at 15:38, Luigi Iannone <[email-masked]> wrote:

Hi Carles, Shwetha, Thank you for your email.Please find our answer inline.CiaoL.On 14 Jan 2022, at 13:43, Carles Gomez Montenegro <[email-masked]> wrote:Hi Luigi, and rest of coauthors,(CC'ing Pascal and Dominique, who made relevant comments in IETF 111.)Thanks for the updated version of your draft.We have a question related with your first point below, and also with thescope of the document (and how it fits the scope of 6Lo):- Do you envision NSA nodes would need to run a routing protocol at all? [LI] No. NSA nodes do not need to run any routing protocol. If any topology change happens a simple local repair is possible and it is done as part of the discovery of the neighbors. Note that topology changes are a very rare event (see more below).Would the forwarding techniques proposed in your draft be sufficient toallow multihop packet transmission within the NSA domain?[LI] Yes, the allocation function proposed in the draft allow a simple and stateless forwarding.On the other hand, in IETF 111 some concerns were expressed (based on anearlier version of your draft), regarding possible (e.g. renumbering)issues due to topology changes (e.g. due to the dynamics of wirelesslinks, even if nodes might actually be static). We understand that morerecent versions of the draft aim to address such issues.[LI] Absolutely right. Actually, the revision that we presented at IETF 112 already included a solution covering the rare case of topology changes (renumbering). And in the very last revision post IETF 112,  Pascal did help us in adding text that clarifies NSA applicability for networks that are rather stable, like for instance  PLC wired networks (where topology changes are part of a network maintenance  or upgrade, which is planned and  handled by the admins).     - What do the WG participants who had those concerns (e.g. Pascal,Dominique) think about the latest versions of the draft?  Would the issuesbe addressed now?[LI] We hope so, but we are happy to solve any residual concern :-)- To the authors: perhaps a bit early at this stage, but do you have anysort of validation (e.g. by simulation or even running code on realdevices) of your proposed mechanisms?[LI] Short answer is “almost” ;-) We are working on a simulation tool in order to validate the proposal and quantify the benefits. Hopefully we will be able to show something at IETF 113 (finger crossed).L.Thanks,Shwetha and CarlesHi All,We just submitted a new revision of the NSA document.Thanks for all the received feedback.The main changes concern:- Revising the text throughout the whole document to make clear that wetalk about forwarding operation, not routing (previous text wasmisleading), hence completely in the scope of 6lo WG.- Thanks lot  to Pascal T. (whom helped through a long private emailexchange) the applicability of NSA has been clarified by adding text.Also, text has been added to clarify the properties of the allocationfunction, namely the fact that the proposed function is simple but notoptimal and other optimized allocation functions can be developed in thefuture (hence the request to IANA to set up a registry for this purpose).While we believe that the document is becoming mature, we still welcomeany feedback people can send us.ThanksCiaoL.(On behalf of all authors)Begin forwarded message:From: [email-masked]: I-D Action: draft-li-6lo-native-short-address-01.txtDate: 14 December 2021 at 09:33:51 CETTo: <[email-masked]>Reply-To: [email-masked] New Internet-Draft is available from the on-line Internet-Draftsdirectories.      Title           : Native Short Addressing for Low power and LossyNetworks Expansion      Authors         : Guangpeng Li                        David Lou                        Luigi Iannone                        Peng Liu                        Rong LongFilename        : draft-li-6lo-native-short-address-01.txtPages           : 22Date            : 2021-12-14Abstract: This document specifies mechanisms of NSA (Native Short Address) that enables IP packet transmission over links where the transmission of a full length address may not be desirable.  This document focuses on carrying IP packets across a LLN (Low power and Lossy Network), in which the topology is relatively static where nodes' location is fixed and the connection between nodes is rather stable.  The changes in the logical topology are only caused by non-frequent disconnection in the link due to some reasons.  The specifications details NSA address allocation, forwarding mechanism, header format design, including length-variable fields, and IPv6 interconnection support.The IETF datatracker status page for this draft is:https://datatracker.ietf.org/doc/draft-li-6lo-native-short-address/There is also an htmlized version available at:https://datatracker.ietf.org/doc/html/draft-li-6lo-native-short-address-01A diff from the previous version is available at:https://www.ietf.org/rfcdiff?url2=draft-li-6lo-native-short-address-01