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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/WF8HTOzIDnbZwC1InbOT5dO0ocg>
Subject: [Lsr] lsr - New Meeting Session Request for IETF 107
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A new meeting session request has just been submitted by Acee Lindem, a Chair of the lsr working group.


---------------------------------------------------------
Working Group Name: Link State Routing
Area Name: Routing Area
Session Requester: Acee Lindem

Number of Sessions: 2
Length of Session(s):  2 Hours, 1 Hour
Number of Attendees: 100
Conflicts to Avoid: 
 Chair Conflict: ipsecme idr rtgwg lsvr
 Technology Overlap: rift spring
 Key Participant Conflict: bfd bess


People who must be present:
  Acee Lindem
  Christian Hopps
  Alvaro Retana

Resources Requested:

Special Requests:
  
---------------------------------------------------------


From nobody Thu Jan  2 11:07:00 2020
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From: Christian Hopps <chopps@chopps.org>
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Cc: Christian Hopps <chopps@chopps.org>, lsr-ads@ietf.org, Antoni Przygienda <prz@juniper.net>
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Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for =
draft-ietf-lsr-isis-invalid-tlv.

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

Tony P (other authors already responded during the adoption poll), =
please indicate your knowledge of any IPR related to this work to the =
list as well.

Thanks,
Chris & Acee.


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Antoni Przygienda <prz@juniper.net>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Antoni Przygienda <prz@juniper.net>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/nEIafAZK3Y39ZTXJU15NCOGBiBM>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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As co-author, I obviously support moving the draft forward.

The impetus for writing the draft was a real world interoperability problem=
 - so there should be no debate about whether the draft is needed.
All parties involved in the problem have actively participated in writing t=
he draft - so I think we can be confident that we have appropriately addres=
sed the related issues.

   Les


> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
> Sent: Thursday, January 02, 2020 11:07 AM
> To: lsr@ietf.org
> Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Antoni
> Przygienda <prz@juniper.net>
> Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
>=20
> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for draft=
-ietf-
> lsr-isis-invalid-tlv.
>=20
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>=20
> Tony P (other authors already responded during the adoption poll), please
> indicate your knowledge of any IPR related to this work to the list as we=
ll.
>=20
> Thanks,
> Chris & Acee.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: Antoni Przygienda <prz@juniper.net>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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From nobody Thu Jan  2 11:40:32 2020
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To: Christian Hopps <chopps@chopps.org>, lsr@ietf.org
Cc: lsr-ads@ietf.org, Antoni Przygienda <prz@juniper.net>
References: <4CBA5DF1-E8E2-4370-9602-871FADAB1F9A@chopps.org>
From: Paul Wells <pauwells@cisco.com>
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Date: Thu, 2 Jan 2020 14:40:26 -0500
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/JuundxkyqqYQZE_mcMoT-jfP8-E>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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Support (as co-author).

Thanks,
Paul

On 1/2/20 2:06 PM, Christian Hopps wrote:
> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for
> draft-ietf-lsr-isis-invalid-tlv.
>
>    https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>
> Tony P (other authors already responded during the adoption poll), please
> indicate your knowledge of any IPR related to this work to the list as
> well.
>
> Thanks,
> Chris & Acee.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


From nobody Thu Jan  2 11:41:35 2020
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From: Antoni Przygienda <prz@juniper.net>
To: Paul Wells <pauwells@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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Date: Thu, 2 Jan 2020 19:41:27 +0000
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From: Tony Li <tony1athome@gmail.com>
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Date: Thu, 2 Jan 2020 12:08:03 -0800
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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As co-author:


This is only 20 years overdue.  Ship it already.  :-)

T


> On Jan 2, 2020, at 11:06 AM, Christian Hopps <chopps@chopps.org> =
wrote:
>=20
> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for =
draft-ietf-lsr-isis-invalid-tlv.
>=20
>  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>=20
> Tony P (other authors already responded during the adoption poll), =
please indicate your knowledge of any IPR related to this work to the =
list as well.
>=20
> Thanks,
> Chris & Acee.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Date: Thu, 2 Jan 2020 12:12:00 -0800
From: Jeff Tantsura <jefftant.ietf@gmail.com>
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yes/support

Happy New Year all!

Cheers,
Jeff
On Jan 2, 2020, 11:07 AM -0800, Christian Hopps <chopps@chopps.org>, wrote:
> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for draft-ietf-lsr-isis-invalid-tlv.
>
> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>
> Tony P (other authors already responded during the adoption poll), please indicate your knowledge of any IPR related to this work to the list as well.
>
> Thanks,
> Chris & Acee.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<div dir=3D=22auto=22>yes/support&=23160;
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Happy New Year all=21</div>
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<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
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</div>
<div name=3D=22messageReplySection=22>On Jan 2, 2020, 11:07 AM -0800, Chr=
istian Hopps &lt;chopps=40chopps.org&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>Th=
is begins a 2 week WG Last Call, ending after Jan 16th, 2020, for draft-i=
etf-lsr-isis-invalid-tlv.<br />
<br />
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/<br />
<br />
Tony P (other authors already responded during the adoption poll), please=
 indicate your knowledge of any IPR related to this work to the list as w=
ell.<br />
<br />
Thanks,<br />
Chris &amp; Acee.<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
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From nobody Thu Jan  2 18:31:04 2020
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Christian Hopps'" <chopps@chopps.org>, <lsr@ietf.org>
Cc: <lsr-ads@ietf.org>, "'Antoni Przygienda'" <prz@juniper.net>
References: <4CBA5DF1-E8E2-4370-9602-871FADAB1F9A@chopps.org>
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Is there any method to indicate or negotiate the support of
ISO10589/RFC5304/RFC6233 because they are not back compatible?
What will be the consequence when not all of the routers within the IGP
domain support the same RFC?
Will it valuable to add more clarification for the above incompatible
scenario, instead of saying "... ... therefore can only be safely =
enabled
when all nodes support the extensions"?


Best Regards.

Aijun Wang
China Telecom

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =
=B4=FA=B1=ED Christian
Hopps
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA1=D4=C23=C8=D5 3:07
=CA=D5=BC=FE=C8=CB: lsr@ietf.org
=B3=AD=CB=CD: lsr-ads@ietf.org; Christian Hopps; Antoni Przygienda
=D6=F7=CC=E2: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv

This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for
draft-ietf-lsr-isis-invalid-tlv.

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

Tony P (other authors already responded during the adoption poll), =
please
indicate your knowledge of any IPR related to this work to the list as =
well.

Thanks,
Chris & Acee.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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Hi, Huaimo:

=20

Thanks for your review.  After the holiday, let=A1=AFs begin the =
discussion.

Your understanding for generating the PUA(Prefix Unreachable =
Announcement)
is correct, but the process for stop the PUA is not the way that we
proposed.

In theory, the ABR will send the PUA once when it notices the specific
prefix is unreachable.=20

When the other router receives the PUA, it will generate one black hole
route, and this black hole route will be kept for a short =
time(configurable)
to facilitate the service convergence that depends on this failed =
prefix.

The PUA will be generated and announced by the ABR only on the following
circumstances:

1. The ABR do the summary work

2. The failed prefix located within the summary route range.

3. The numbered of the failed prefixes not exceed the
MAA(MAX_Address_Announcement) as defined in
https://tools.ietf.org/html/draft-wang-lsr-prefix-unreachable-annoucement=
-01
#section-6

=20

More implementation consideration can be found on the above section.

We are also appreciate to get more feedbacks for the current =
implementation
consideration.

=20

More specific answers are also presented inline below.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=20

=B7=A2=BC=FE=C8=CB: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =
=B4=FA=B1=ED Huaimo Chen
=B7=A2=CB=CD=CA=B1=BC=E4: 2019=C4=EA12=D4=C220=C8=D5 22:50
=CA=D5=BC=FE=C8=CB: Aijun Wang; lsr@ietf.org
=D6=F7=CC=E2: [Lsr] Questions on Prefix Unreachable Announcement

=20

Hi Aijun,

=20

    My understanding of your draft
https://datatracker.ietf.org/doc/draft-wang-lsr-prefix-unreachable-annouc=
eme
nt/
<https://datatracker..ietf.org/doc/draft-wang-lsr-prefix-unreachable-anno=
uce
ment/>  as follows:=20

    After the ABR originates the Extended Prefix Opaque LSA, which =
contains
a prefix and its originator (i.e., the router originating the prefix), =
it
will announce that the prefix is unreachable when it can not reach the
prefix (i.e., the prefix becomes unreachable from reachable from the =
ABR's
perspective).=20

     Is my understanding right?

       [Aijun Wang]: Yes

=20

Should the ABR remove the prefix from the Extended Prefix Opaque LSA =
after
it announces the prefix unreachable for a give period of time?

      [Aijun Wang]: In theory, the ABR will only announce once when it
notices the disappear of the specific prefix.

=20

After a router in another area receives the unreachable announcement of =
the
prefix, it installs a black hole route to the prefix, and then removes =
the
black hole route after a configurable time. After the black hole route
derived from the unreachable announcement of the prefix is removed, it =
seems
better to remove the unreachable prefix from the LSA.=20

    [Aijun Wang]: the PUA will not be announced continuously.



     Can the ABR just remove the prefix (i.e., the TLV for the prefix) =
from
the Extended Prefix Opaque LSA when it can not reach the prefix?=20

    [Aijun Wang]: When the ABR do the summary work, it will not announce =
the
detailed prefixes that located within the summary route range. Then the
unreachable prefixes located in the summary range should be announced
explicitly.

=20

Best Regards,

Huaimo


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</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Huaimo:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks for your review.&nbsp; After the holiday, let=A1=AFs begin the =
discussion.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Your understanding for generating the PUA(Prefix Unreachable =
Announcement) is correct, but the process for stop the PUA is not the =
way that we proposed.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>In theory, the ABR will send the PUA once when it notices the =
specific prefix is unreachable. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>When the other router receives the PUA, it will generate one black =
hole route, and this black hole route will be kept for a short =
time(configurable) to facilitate the service convergence that depends on =
this failed prefix.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>The PUA will be generated and announced by the ABR only on the =
following circumstances:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>1. The ABR do the summary work<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>2. The failed prefix located within the summary route =
range.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>3. The numbered of the failed prefixes not exceed the =
MAA(MAX_Address_Announcement) as defined in </span><span lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/draft-wang-lsr-prefix-unreachable-ann=
oucement-01#section-6">https://tools.ietf.org/html/draft-wang-lsr-prefix-=
unreachable-annoucement-01#section-6</a><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>More implementation consideration can be found on the above =
section.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>We are also appreciate to get more feedbacks for the current =
implementation consideration.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>More specific answers are also presented inline =
below.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=BC=FE=C8=CB<sp=
an lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> =
lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B4=FA=B1=ED =
</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>Huaimo =
Chen<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=CB=CD=CA=B1=BC=
=E4<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> 2019</span><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C4=EA<span =
lang=3DEN-US>12</span>=D4=C2<span lang=3DEN-US>20</span>=C8=D5<span =
lang=3DEN-US> 22:50<br></span><b>=CA=D5=BC=FE=C8=CB<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; =
lsr@ietf.org<br></span><b>=D6=F7=CC=E2<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> [Lsr] Questions on Prefix =
Unreachable Announcement<o:p></o:p></span></span></p></div></div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>Hi =
Aijun,<o:p></o:p></span></p></div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p>&nbsp;</o:p=
></span></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>&nbsp; &nbsp; =
My understanding of your draft <a =
href=3D"https://datatracker..ietf.org/doc/draft-wang-lsr-prefix-unreachab=
le-annoucement/">https://datatracker.ietf.org/doc/draft-wang-lsr-prefix-u=
nreachable-annoucement/</a>&nbsp;as =
follows:&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>&nbsp; &nbsp; =
After the ABR originates the Extended Prefix Opaque LSA, which contains =
a prefix and its originator (i.e., the router originating the prefix), =
it will announce that the prefix is unreachable when it can not reach =
the prefix (i.e., the prefix becomes unreachable from reachable from the =
ABR's perspective).&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>&nbsp; &nbsp; =
&nbsp;Is my understanding right?</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p></o:p></spa=
n></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Aijun Wang]: =
Yes<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p>&nbsp;</o:p=
></span></p></div><div><p class=3DMsoNormal =
style=3D'text-indent:12.0pt'><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>Should the ABR =
remove the prefix from the&nbsp;<span =
style=3D'background:white'>Extended Prefix Opaque LSA</span>&nbsp;after =
it announces the prefix unreachable for a give period of =
time?</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></s=
pan></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Aijun Wang]: In theory, the ABR will =
only announce once when it notices the disappear of the specific =
prefix.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-indent:12.0pt'><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'> After a router =
in another area receives the unreachable announcement of the prefix, it =
installs a black hole route to the prefix, and then removes the black =
hole route after a configurable time. After the black hole route derived =
from <span style=3D'background:white'>the unreachable announcement of =
the prefix is removed, it seems better to remove the unreachable prefix =
from the LSA.&nbsp;</span><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:#1F497D;background:whit=
e'>&nbsp;&nbsp;&nbsp; [Aijun Wang]: the PUA will not be announced =
continuously.</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black;background:white'=
><br><br></span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p></o:p></spa=
n></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black;background:white'=
>&nbsp; &nbsp; &nbsp;Can the ABR just remove the prefix (i.e., the TLV =
for the prefix) from&nbsp;the&nbsp;Extended Prefix Opaque LSA =
when&nbsp;it can not reach the prefix?&nbsp;</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p></o:p></spa=
n></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>&nbsp; =
&nbsp;&nbsp;</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:#1F497D'>[Aijun Wang]: =
When the ABR do the summary work, it will not announce the detailed =
prefixes that located within the summary route range. Then the =
unreachable prefixes located in the summary range should be announced =
explicitly.</span><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p></o:p></spa=
n></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'><o:p>&nbsp;</o:p=
></span></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>Best =
Regards,<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:black'>Huaimo<o:p></o:p=
></span></p></div></div></div></div></body></html>
------=_NextPart_000_004F_01D5C224.B420FE50--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "'Christian Hopps'" <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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From nobody Sun Jan  5 18:04:32 2020
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Les Ginsberg \(ginsberg\)'" <ginsberg@cisco.com>, "'Christian Hopps'" <chopps@chopps.org>, <lsr@ietf.org>
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Subject: [Lsr] =?utf-8?b?562U5aSNOiAg562U5aSNOiAgV0cgTGFzdCBDYWxsIGRyYWZ0?= =?utf-8?q?-ietf-lsr-isis-invalid-tlv?=
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Hi, Les:

=20

Since this draft is the main entry for the management of invalid tlv in =
isis, will it be more useful to include the description that you provide =
for its completeness?  Knowing the possible consequences may drive the =
operators to consider more carefully for their updating deployment.

=20

Anyway, I support this draft.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Les Ginsberg (ginsberg) =
[mailto:ginsberg@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=883=E6=97=A5 =
13:29
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Christian Hopps'; lsr@ietf.org
=E6=8A=84=E9=80=81: lsr-ads@ietf.org; 'Antoni Przygienda'
=E4=B8=BB=E9=A2=98: RE: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

=20

Aijun -

=20

Since advertising some sort of capability would also be unusable until =
all routers were upgraded to understand the new capability advertisement =
this does not help. =F0=9F=98=8A

=20

The consequences of enabling a form of authentication which is not =
supported by all nodes is an inconsistent LSPDB - which means protocol =
function is broken.

=20

I would also point out that the incompatibilities are discussed in the =
original specifications (RFC 5304 and RFC 6232) - both of which have =
been published for a number of years. The points being made in this =
regard in this draft aren't new.

=20

   Les

=20

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

> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang

> Sent: Thursday, January 02, 2020 6:31 PM

> To: 'Christian Hopps' <chopps@chopps.org>; lsr@ietf.org

> Cc: lsr-ads@ietf.org; 'Antoni Przygienda' <prz@juniper.net>

> Subject: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

>=20

> Is there any method to indicate or negotiate the support of

> ISO10589/RFC5304/RFC6233 because they are not back compatible?

> What will be the consequence when not all of the routers within the =
IGP

> domain support the same RFC?

> Will it valuable to add more clarification for the above incompatible

> scenario, instead of saying "... ... therefore can only be safely =
enabled

> when all nodes support the extensions"?

>=20

>=20

> Best Regards.

>=20

> Aijun Wang

> China Telecom

>=20

> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----

> =E5=8F=91=E4=BB=B6=E4=BA=BA:  <mailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org [ <mailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Christian

> Hopps

> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2020=E5=B9=B41=E6=9C=883=E6=97=A5 3:07

> =E6=94=B6=E4=BB=B6=E4=BA=BA:  <mailto:lsr@ietf.org> lsr@ietf.org

> =E6=8A=84=E9=80=81:  <mailto:lsr-ads@ietf.org> lsr-ads@ietf.org; =
Christian Hopps; Antoni Przygienda

> =E4=B8=BB=E9=A2=98: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv

>=20

> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for

> draft-ietf-lsr-isis-invalid-tlv.

>=20

>    <https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/> =
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

>=20

> Tony P (other authors already responded during the adoption poll), =
please

> indicate your knowledge of any IPR related to this work to the list as =
well.

>=20

> Thanks,

> Chris & Acee.

>=20

> _______________________________________________

> Lsr mailing list

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

>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>=20

> _______________________________________________

> Lsr mailing list

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

>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Hi, =
Les:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Since this draft is the main =
entry for the management of invalid tlv in isis, will it be more useful =
to include the description that you provide for its completeness?=C2=A0 =
Knowing the possible consequences may drive the operators to consider =
more carefully for their updating deployment.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Anyway, I support this =
draft.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Les Ginsberg =
(ginsberg) [mailto:ginsberg@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>3</span>=E6=97=A5<span =
lang=3DEN-US> 13:29<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; 'Christian =
Hopps'; lsr@ietf.org<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> lsr-ads@ietf.org; 'Antoni =
Przygienda'<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> RE: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></span></p></div></div><=
p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Aijun -<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Since advertising some sort of =
capability would also be unusable until all routers were upgraded to =
understand the new capability advertisement this does not help. =
</span><span lang=3DEN-US =
style=3D'font-family:"Arial","sans-serif"'>&#128522;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>The consequences of enabling a form of authentication which =
is not supported by all nodes is an inconsistent LSPDB - which means =
protocol function is broken.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>I would also point out that the =
incompatibilities are discussed in the original specifications (RFC 5304 =
and RFC 6232) - both of which have been published for a number of years. =
The points being made in this regard in this draft aren't =
new.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; -----Original =
Message-----<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; From: Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt; On =
Behalf Of Aijun Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Sent: Thursday, January 02, 2020 6:31 =
PM<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
To: 'Christian Hopps' &lt;<a =
href=3D"mailto:chopps@chopps.org">chopps@chopps.org</a>&gt;; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Cc: <a =
href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; 'Antoni =
Przygienda' &lt;<a =
href=3D"mailto:prz@juniper.net">prz@juniper.net</a>&gt;<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; Subject: [Lsr] =
</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Is there any method to =
indicate or negotiate the support of<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; ISO10589/RFC5304/RFC6233 =
because they are not back compatible?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; What will be the =
consequence when not all of the routers within the =
IGP<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
domain support the same RFC?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Will it valuable to add =
more clarification for the above incompatible<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; scenario, instead of saying =
&quot;... ... therefore can only be safely =
enabled<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; when all nodes support the =
extensions&quot;?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Best Regards.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; China Telecom<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; -----</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6</span><span =
lang=3DEN-US>-----<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=8F=91=E4=BB=B6=E4=BA=BA</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org</spa=
n></a> [<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>] </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E4=BB=A3=E8=A1=A8</span><span lang=3DEN-US> =
Christian<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Hopps<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span><span lang=3DEN-US>: =
2020</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=B9=B4</span><span lang=3DEN-US>1</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=9C=88</span><span lang=3DEN-US>3</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=97=A5</span><span lang=3DEN-US> 3:07<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=94=B6=E4=BB=B6=E4=BA=BA</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=8A=84=E9=80=81</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr-ads@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-ads@ietf.org</span></=
a>; Christian Hopps; Antoni Przygienda<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E4=B8=BB=E9=A2=98</span><span lang=3DEN-US>: [Lsr] WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; This begins a 2 week WG =
Last Call, ending after Jan 16th, 2020, for<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
draft-ietf-lsr-isis-invalid-tlv.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; &nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/=
"><span =
style=3D'color:windowtext;text-decoration:none'>https://datatracker.ietf.=
org/doc/draft-ietf-lsr-isis-invalid-tlv/</span></a><o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Tony P (other authors =
already responded during the adoption poll), =
please<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; indicate your knowledge of any IPR related to this =
work to the list as well.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Chris &amp; Acee.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p></div></body></html>
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Les Ginsberg \(ginsberg\)'" <ginsberg@cisco.com>, "'Christian Hopps'" <chopps@chopps.org>, <lsr@ietf.org>
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Hi, Les:

=20

The questions is raised actually by the current description in section =
3.2. =20

It describes the incompatible issues among different RFCs, but no =
promising solution (maybe there is none), also not emphasizing the =
consequence for the incompatible deployments (may exist in other =
document).

Anyway, I knew the answers. Put it into the document may be more helpful =
for others.

=20

Best Regards.

=20

Aijun Wang

China Telecom=20

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Les Ginsberg (ginsberg) =
[mailto:ginsberg@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 =
10:42
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Christian Hopps'; lsr@ietf.org
=E6=8A=84=E9=80=81: lsr-ads@ietf.org; 'Antoni Przygienda'
=E4=B8=BB=E9=A2=98: RE: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

=20

Aijun =E2=80=93

=20

Please read Section 3.2 of the draft which discusses these issues.

Thanx.

=20

   Les

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>=20
Sent: Sunday, January 05, 2020 6:04 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; 'Christian Hopps' =
<chopps@chopps.org>; lsr@ietf.org
Cc: lsr-ads@ietf.org; 'Antoni Przygienda' <prz@juniper.net>
Subject: =E7=AD=94=E5=A4=8D: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

=20

Hi, Les:

=20

Since this draft is the main entry for the management of invalid tlv in =
isis, will it be more useful to include the description that you provide =
for its completeness?  Knowing the possible consequences may drive the =
operators to consider more carefully for their updating deployment.

=20

Anyway, I support this draft.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Les Ginsberg (ginsberg) =
[mailto:ginsberg@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=883=E6=97=A5 =
13:29
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; 'Christian Hopps'; lsr@ietf.org
=E6=8A=84=E9=80=81: lsr-ads@ietf.org; 'Antoni Przygienda'
=E4=B8=BB=E9=A2=98: RE: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

=20

Aijun -

=20

Since advertising some sort of capability would also be unusable until =
all routers were upgraded to understand the new capability advertisement =
this does not help. =F0=9F=98=8A

=20

The consequences of enabling a form of authentication which is not =
supported by all nodes is an inconsistent LSPDB - which means protocol =
function is broken.

=20

I would also point out that the incompatibilities are discussed in the =
original specifications (RFC 5304 and RFC 6232) - both of which have =
been published for a number of years. The points being made in this =
regard in this draft aren't new.

=20

   Les

=20

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

> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang

> Sent: Thursday, January 02, 2020 6:31 PM

> To: 'Christian Hopps' <chopps@chopps.org>; lsr@ietf.org

> Cc: lsr-ads@ietf.org; 'Antoni Przygienda' <prz@juniper.net>

> Subject: [Lsr] =E7=AD=94=E5=A4=8D: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv

>=20

> Is there any method to indicate or negotiate the support of

> ISO10589/RFC5304/RFC6233 because they are not back compatible?

> What will be the consequence when not all of the routers within the =
IGP

> domain support the same RFC?

> Will it valuable to add more clarification for the above incompatible

> scenario, instead of saying "... ... therefore can only be safely =
enabled

> when all nodes support the extensions"?

>=20

>=20

> Best Regards.

>=20

> Aijun Wang

> China Telecom

>=20

> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----

> =E5=8F=91=E4=BB=B6=E4=BA=BA:  <mailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org [ <mailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Christian

> Hopps

> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2020=E5=B9=B41=E6=9C=883=E6=97=A5 3:07

> =E6=94=B6=E4=BB=B6=E4=BA=BA:  <mailto:lsr@ietf.org> lsr@ietf.org

> =E6=8A=84=E9=80=81:  <mailto:lsr-ads@ietf.org> lsr-ads@ietf.org; =
Christian Hopps; Antoni Przygienda

> =E4=B8=BB=E9=A2=98: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv

>=20

> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for

> draft-ietf-lsr-isis-invalid-tlv.

>=20

>    <https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/> =
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

>=20

> Tony P (other authors already responded during the adoption poll), =
please

> indicate your knowledge of any IPR related to this work to the list as =
well.

>=20

> Thanks,

> Chris & Acee.

>=20

> _______________________________________________

> Lsr mailing list

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

>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>=20

> _______________________________________________

> Lsr mailing list

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

>  <https://www.ietf.org/mailman/listinfo/lsr> =
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Hi, =
Les:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>The questions is raised =
actually by the current description in section 3.2.=C2=A0 =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>It describes the incompatible =
issues among different RFCs, but no promising solution (maybe there is =
none), also not emphasizing the consequence for the incompatible =
deployments (may exist in other document).<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Anyway, I knew the answers. Put =
it into the document may be more helpful for =
others.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'> <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Les Ginsberg =
(ginsberg) [mailto:ginsberg@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>6</span>=E6=97=A5<span =
lang=3DEN-US> 10:42<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; 'Christian =
Hopps'; lsr@ietf.org<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> lsr-ads@ietf.org; 'Antoni =
Przygienda'<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> RE: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></span></p></div></div><=
p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Aijun =
=E2=80=93<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Please read Section 3.2 of the draft which discusses these =
issues.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Thanx.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; <br><b>Sent:</b> Sunday, January 05, 2020 6:04 PM<br><b>To:</b> Les =
Ginsberg (ginsberg) &lt;<a =
href=3D"mailto:ginsberg@cisco.com">ginsberg@cisco.com</a>&gt;; =
'Christian Hopps' &lt;<a =
href=3D"mailto:chopps@chopps.org">chopps@chopps.org</a>&gt;; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br><b>Cc:</b> <a =
href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; 'Antoni =
Przygienda' &lt;<a =
href=3D"mailto:prz@juniper.net">prz@juniper.net</a>&gt;<br><b>Subject:</b=
> </span><span style=3D'font-family:"MS =
Gothic"'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US>: [Lsr] =
</span><span style=3D'font-family:"MS =
Gothic"'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Hi, =
Les:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Since this draft is the main =
entry for the management of invalid tlv in isis, will it be more useful =
to include the description that you provide for its completeness?&nbsp; =
Knowing the possible consequences may drive the operators to consider =
more carefully for their updating deployment.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Anyway, I support this =
draft.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Les Ginsberg =
(ginsberg) [<a =
href=3D"mailto:ginsberg@cisco.com">mailto:ginsberg@cisco.com</a>] =
<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>3</span>=E6=97=A5<span =
lang=3DEN-US> 13:29<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; 'Christian =
Hopps'; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br></span><b>=E6=8A=84=E9=80=
=81<span lang=3DEN-US>:</span></b><span lang=3DEN-US> <a =
href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; 'Antoni =
Przygienda'<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> RE: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></span></p></div></div><=
p class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Aijun -<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Since advertising some sort of =
capability would also be unusable until all routers were upgraded to =
understand the new capability advertisement this does not help. =
</span><span lang=3DEN-US style=3D'font-family:"Times New =
Roman","serif"'>&#128522;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>The consequences of enabling a form of authentication which =
is not supported by all nodes is an inconsistent LSPDB - which means =
protocol function is broken.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>I would also point out that the =
incompatibilities are discussed in the original specifications (RFC 5304 =
and RFC 6232) - both of which have been published for a number of years. =
The points being made in this regard in this draft aren't =
new.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; -----Original =
Message-----<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; From: Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt; On =
Behalf Of Aijun Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Sent: Thursday, January 02, 2020 6:31 =
PM<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
To: 'Christian Hopps' &lt;<a =
href=3D"mailto:chopps@chopps.org">chopps@chopps.org</a>&gt;; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Cc: <a =
href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; 'Antoni =
Przygienda' &lt;<a =
href=3D"mailto:prz@juniper.net">prz@juniper.net</a>&gt;<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; Subject: [Lsr] =
</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US>: WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Is there any method to =
indicate or negotiate the support of<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; ISO10589/RFC5304/RFC6233 =
because they are not back compatible?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; What will be the =
consequence when not all of the routers within the =
IGP<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
domain support the same RFC?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Will it valuable to add =
more clarification for the above incompatible<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; scenario, instead of saying =
&quot;... ... therefore can only be safely =
enabled<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; when all nodes support the =
extensions&quot;?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Best Regards.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; China Telecom<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; -----</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6</span><span =
lang=3DEN-US>-----<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=8F=91=E4=BB=B6=E4=BA=BA</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org</spa=
n></a> [<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>] </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E4=BB=A3=E8=A1=A8</span><span lang=3DEN-US> =
Christian<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Hopps<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span><span lang=3DEN-US>: =
2020</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E5=B9=B4</span><span lang=3DEN-US>1</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=9C=88</span><span lang=3DEN-US>3</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=97=A5</span><span lang=3DEN-US> 3:07<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=94=B6=E4=BB=B6=E4=BA=BA</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
</span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E6=8A=84=E9=80=81</span><span lang=3DEN-US>: <a =
href=3D"mailto:lsr-ads@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-ads@ietf.org</span></=
a>; Christian Hopps; Antoni Przygienda<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; </span><span =
style=3D'font-family:"=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91","sans-serif"'=
>=E4=B8=BB=E9=A2=98</span><span lang=3DEN-US>: [Lsr] WG Last Call =
draft-ietf-lsr-isis-invalid-tlv<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; This begins a 2 week WG =
Last Call, ending after Jan 16th, 2020, for<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
draft-ietf-lsr-isis-invalid-tlv.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; &nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/=
"><span =
style=3D'color:windowtext;text-decoration:none'>https://datatracker.ietf.=
org/doc/draft-ietf-lsr-isis-invalid-tlv/</span></a><o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Tony P (other authors =
already responded during the adoption poll), =
please<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; indicate your knowledge of any IPR related to this =
work to the list as well.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Chris &amp; Acee.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p></div></div></body></htm=
l>
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: <lsr@ietf.org>
Date: Mon, 6 Jan 2020 12:02:48 +0800
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/VUouF2rlGUtcjEY1LJb-_V8aPSQ>
Subject: [Lsr] Is it necessary to expand the IS-IS level to 8?
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Hi, Tony, Les and Paul: 

 

As I read the draft
https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-00, and
notice the proposal to expand the reserved bits in "Circuit Type" to cover
the level 1-8 in ISIS domain.

Here I just want to know is it necessary to expand the IS-IS level to 8 and
occupy all the reserved bits in the PDU format?

 

As compared with the OSPF format, there is one field to describe the "Link
Type" (5 bits, currently define only four types). We want to use the
reserved bits in current "Circuit Type" of ISIS PDU format to fulfill the
similar tasks. 

 

Can this draft leave at least 2 reserved bits for this purpose? There are
many ways to tackle the scale of networks, who will design their network in
level 8 hierarchy? As I estimated, Level 4 may be the acceptable highest
network hierarchy.

 

 

Best Regards.

 

Aijun Wang

China Telecom

 

 

 

 


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vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US>Hi, Tony, =
Les and Paul: <o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>As I read the draft <a =
href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarch=
y-00">https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-=
00</a>, and notice the proposal to expand the reserved bits in =
&#8220;Circuit Type&#8221; to cover the level 1-8 in ISIS =
domain.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Here I just want to know is it necessary to expand the =
IS-IS level to 8 and occupy all the reserved bits in the PDU =
format?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>As compared with the OSPF format, there is one field to =
describe the &#8220;Link Type&#8221; (5 bits, currently define only four =
types). We want to use the reserved bits in current &#8220;Circuit =
Type&#8221; of ISIS PDU format to fulfill the similar tasks. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Can this draft leave at least 2 reserved bits for this =
purpose? There are many ways to tackle the scale of networks, who will =
design their network in level 8 hierarchy? As I estimated, Level 4 may =
be the acceptable highest network hierarchy.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Is it necessary to expand the IS-IS level to 8?
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Subject: Re: [Lsr] Is it necessary to expand the IS-IS level to 8?
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Aijun -

Regarding the number of levels, Tony responded to a similar comment several=
 months ago - please see https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59=
TNuY3rxgjd6iXIq6sYg

<snip>
> It seems not necessary to have 8 levels of hierarchies. 3 or at most 4 le=
vels of hierarchies should be enough. IS-IS with 3 levels of hierarchies ma=
y support a network with 1k*1k*1k nodes, which is about 10^9 =3D 1 billion =
nodes. IS-IS with 4 levels of hierarchies may support a network with 1k*1k*=
1k*1k nodes, which is about 10^12 =3D 1 trillion nodes.


This is correct.  It's not absolutely necessary. However, as Robert mention=
ed, it does give the network designer flexibility to create the hierarchy t=
hat matches the needs of his network.  The cost of the additional levels is=
 very small, given that we're considering adding any levels at all, so it s=
eemed sensible to define all of the levels at once.

"From an architectural point of view, if a number isn't obviously too large=
, then it's probably too small."  - Ross Callon

<end snip>

Link type in OSPF is not at all the same thing as level in IS-IS - so I do =
not find that analogy appropriate:

>From https://tools.ietf.org/html/rfc2328 page 128

<snip>
Link type   Description       Link ID
                   __________________________________________________
                   1           Point-to-point    Neighbor Router ID
                               link
                   2           Link to transit   Interface address of
                               network           Designated Router
                   3           Link to stub      IP network number
                               network
                   4           Virtual link      Neighbor Router ID


                           Table 18: Link descriptions in the
                                      router-LSA.
<end snip>

   Les


From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang
Sent: Sunday, January 05, 2020 8:03 PM
To: lsr@ietf.org
Subject: [Lsr] Is it necessary to expand the IS-IS level to 8?

Hi, Tony, Les and Paul:

As I read the draft https://tools.ietf.org/html/draft-ietf-lsr-isis-extende=
d-hierarchy-00, and notice the proposal to expand the reserved bits in "Cir=
cuit Type" to cover the level 1-8 in ISIS domain.
Here I just want to know is it necessary to expand the IS-IS level to 8 and=
 occupy all the reserved bits in the PDU format?

As compared with the OSPF format, there is one field to describe the "Link =
Type" (5 bits, currently define only four types). We want to use the reserv=
ed bits in current "Circuit Type" of ISIS PDU format to fulfill the similar=
 tasks.

Can this draft leave at least 2 reserved bits for this purpose? There are m=
any ways to tackle the scale of networks, who will design their network in =
level 8 hierarchy? As I estimated, Level 4 may be the acceptable highest ne=
twork hierarchy.


Best Regards.

Aijun Wang
China Telecom





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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Aijun &#8211;<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Regarding the numbe=
r of levels, Tony responded to a similar comment several months ago &#8211;=
 please see
<a href=3D"https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXI=
q6sYg">https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq6sY=
g</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&lt;snip&gt;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&gt; It seems not necessary to have 8 levels of hierarchies. 3 o=
r at most 4 levels of hierarchies should be enough. IS-IS with 3 levels of =
hierarchies may support a network with 1k*1k*1k
 nodes, which is about 10^9 =3D 1 billion nodes. IS-IS with 4 levels of hie=
rarchies may support a network with 1k*1k*1k*1k nodes, which is about 10^12=
 =3D 1 trillion nodes.<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">This is correct.&nbsp; It&#8217;s not absolutely necessary. Howe=
ver, as Robert mentioned, it does give the network designer flexibility to =
create the hierarchy that matches the needs of his
 network.&nbsp; The cost of the additional levels is very small, given that=
 we&#8217;re considering adding any levels at all, so it seemed sensible to=
 define all of the levels at once.<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&#8220;From an architectural point of view, if a number isn&#821=
7;t obviously too large, then it&#8217;s probably too small.&#8221;&nbsp; &=
#8212; Ross Callon<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&lt;end snip&gt;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Link type in OSPF i=
s not at all the same thing as level in IS-IS &#8211; so I do not find that=
 analogy appropriate:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">From <a href=3D"htt=
ps://tools.ietf.org/html/rfc2328">
https://tools.ietf.org/html/rfc2328</a> page 128<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&lt;snip&gt;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">Link type&nbsp;&nbsp; Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; Link ID<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ______________________________=
____________________<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Point-to-point&nbsp;&nbsp;&nbsp; Neighbor R=
outer ID<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to transit&nbsp;&nbsp; Interface addre=
ss of<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; network&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Designated Router<o:p></o:p></span></i><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to stub&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
IP network number<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; network<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Virtual link&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Neighbor Router ID<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; Table 18: Link descriptions in the<o:p></o:p></span></i><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; router-LSA.<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><i><span style=3D"font-si=
ze:11.0pt">&lt;end snip&gt;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">&nbsp;&nbsp; Les<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></=
span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><b><span st=
yle=3D"font-size:11.0pt">From:</span></b><span style=3D"font-size:11.0pt"> =
Lsr &lt;lsr-bounces@ietf.org&gt;
<b>On Behalf Of </b>Aijun Wang<br>
<b>Sent:</b> Sunday, January 05, 2020 8:03 PM<br>
<b>To:</b> lsr@ietf.org<br>
<b>Subject:</b> [Lsr] Is it necessary to expand the IS-IS level to 8?<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" align=3D"left" style=3D"text-align:left"><o:p>&nbsp;=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Hi, Tony,=
 Les and Paul:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">As I read=
 the draft
<a href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarc=
hy-00">https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-0=
0</a>, and notice the proposal to expand the reserved bits in &#8220;Circui=
t Type&#8221; to cover the level 1-8 in ISIS domain.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Here I ju=
st want to know is it necessary to expand the IS-IS level to 8 and occupy a=
ll the reserved bits in the PDU format?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">As compar=
ed with the OSPF format, there is one field to describe the &#8220;Link Typ=
e&#8221; (5 bits, currently define only four types). We want to use the res=
erved bits in current &#8220;Circuit Type&#8221; of ISIS PDU
 format to fulfill the similar tasks. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Can this =
draft leave at least 2 reserved bits for this purpose? There are many ways =
to tackle the scale of networks, who will design their network in level 8 h=
ierarchy? As I estimated, Level 4 may
 be the acceptable highest network hierarchy.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Best Rega=
rds.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Aijun Wan=
g<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">China Tel=
ecom<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
</div>
</body>
</html>

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "'Christian Hopps'" <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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From nobody Mon Jan  6 00:13:49 2020
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Les Ginsberg \(ginsberg\)'" <ginsberg@cisco.com>, <lsr@ietf.org>
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Hi, Les:

=20

We just want to distinguish the passive interfaces from other normal
interfaces within ISIS domain.  It seems that the =A1=B0Attribute =
Flags=A1=B1 that
described in https://tools.ietf.org/html/rfc7794#section-2.1 is the most
appropriate place to extend to carry such information.

If so, we can write one draft to define one more attribute flag to
accomplish this.

=20

Or, is there any other way to fulfill this task? Originally, I want to =
reuse
the reserve bits before =A1=B0Circuit Type=A1=B1 field.  It seems not =
the right
direction.=20

=20

And on the other hand, occupying all the reserved bits for the =
unnecessary
expansion is also not the right direction?=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=B7=A2=BC=FE=C8=CB: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =
=B4=FA=B1=ED Les Ginsberg
(ginsberg)
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA1=D4=C26=C8=D5 12:52
=CA=D5=BC=FE=C8=CB: Aijun Wang; lsr@ietf.org
=D6=F7=CC=E2: Re: [Lsr] Is it necessary to expand the IS-IS level to 8?

=20

Aijun =A8C

=20

Regarding the number of levels, Tony responded to a similar comment =
several
months ago =A8C please see
https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq6sYg

=20

<snip>

> It seems not necessary to have 8 levels of hierarchies. 3 or at most 4
levels of hierarchies should be enough. IS-IS with 3 levels of =
hierarchies
may support a network with 1k*1k*1k nodes, which is about 10^9 =3D 1 =
billion
nodes. IS-IS with 4 levels of hierarchies may support a network with
1k*1k*1k*1k nodes, which is about 10^12 =3D 1 trillion nodes.

=20

=20

This is correct.  It=A1=AFs not absolutely necessary. However, as Robert
mentioned, it does give the network designer flexibility to create the
hierarchy that matches the needs of his network.  The cost of the =
additional
levels is very small, given that we=A1=AFre considering adding any =
levels at
all, so it seemed sensible to define all of the levels at once.

=20

=A1=B0From an architectural point of view, if a number isn=A1=AFt =
obviously too
large, then it=A1=AFs probably too small.=A1=B1  =A1=AA Ross Callon

=20

<end snip>

=20

Link type in OSPF is not at all the same thing as level in IS-IS =A8C so =
I do
not find that analogy appropriate:

=20

>From https://tools.ietf.org/html/rfc2328 page 128

=20

<snip>

Link type   Description       Link ID

                   __________________________________________________

                   1           Point-to-point    Neighbor Router ID

                               link

                   2           Link to transit   Interface address of

                               network           Designated Router

                   3           Link to stub      IP network number

                               network

                   4           Virtual link      Neighbor Router ID

=20

=20

                           Table 18: Link descriptions in the

                                      router-LSA.

<end snip>

=20

   Les

=20

=20

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang
Sent: Sunday, January 05, 2020 8:03 PM
To: lsr@ietf.org
Subject: [Lsr] Is it necessary to expand the IS-IS level to 8?

=20

Hi, Tony, Les and Paul:=20

=20

As I read the draft
https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-00, =
and
notice the proposal to expand the reserved bits in =A1=B0Circuit =
Type=A1=B1 to cover
the level 1-8 in ISIS domain.

Here I just want to know is it necessary to expand the IS-IS level to 8 =
and
occupy all the reserved bits in the PDU format?

=20

As compared with the OSPF format, there is one field to describe the =
=A1=B0Link
Type=A1=B1 (5 bits, currently define only four types). We want to use =
the
reserved bits in current =A1=B0Circuit Type=A1=B1 of ISIS PDU format to =
fulfill the
similar tasks.=20

=20

Can this draft leave at least 2 reserved bits for this purpose? There =
are
many ways to tackle the scale of networks, who will design their network =
in
level 8 hierarchy? As I estimated, Level 4 may be the acceptable highest
network hierarchy.

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=20

=20

=20


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi, Les:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>We just =
want to distinguish the passive interfaces from other normal interfaces =
within ISIS domain.&nbsp; It seems that the =A1=B0Attribute Flags=A1=B1 =
that described in <a =
href=3D"https://tools.ietf.org/html/rfc7794#section-2.1">https://tools.ie=
tf.org/html/rfc7794#section-2.1</a> is the most appropriate place to =
extend to carry such information.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>If so, we =
can write one draft to define one more attribute flag to accomplish =
this.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Or, is =
there any other way to fulfill this task? Originally, I want to reuse =
the reserve bits before =A1=B0Circuit Type=A1=B1 field.&nbsp; It seems =
not the right direction. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>And on the =
other hand, occupying all the reserved bits for the unnecessary =
expansion is also not the right direction? <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=BC=FE=C8=CB<sp=
an lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> =
lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B4=FA=B1=ED =
</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>Les Ginsberg =
(ginsberg)<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=CB=CD=CA=B1=BC=
=E4<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> 2020</span><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C4=EA<span =
lang=3DEN-US>1</span>=D4=C2<span lang=3DEN-US>6</span>=C8=D5<span =
lang=3DEN-US> 12:52<br></span><b>=CA=D5=BC=FE=C8=CB<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; =
lsr@ietf.org<br></span><b>=D6=F7=CC=E2<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Is it necessary =
to expand the IS-IS level to =
8?<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'>Aijun =
=A8C<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Regarding the number of levels, Tony =
responded to a similar comment several months ago =A8C please see <a =
href=3D"https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq=
6sYg">https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq6s=
Yg</a><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&gt; It seems not necessary to have 8 levels =
of hierarchies. 3 or at most 4 levels of hierarchies should be enough. =
IS-IS with 3 levels of hierarchies may support a network with 1k*1k*1k =
nodes, which is about 10^9 =3D 1 billion nodes. IS-IS with 4 levels of =
hierarchies may support a network with 1k*1k*1k*1k nodes, which is about =
10^12 =3D 1 trillion nodes.<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>This is correct.&nbsp; It=A1=AFs not =
absolutely necessary. However, as Robert mentioned, it does give the =
network designer flexibility to create the hierarchy that matches the =
needs of his network.&nbsp; The cost of the additional levels is very =
small, given that we=A1=AFre considering adding any levels at all, so it =
seemed sensible to define all of the levels at =
once.<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>=A1=B0From an architectural point of view, if =
a number isn=A1=AFt obviously too large, then it=A1=AFs probably too =
small.=A1=B1&nbsp; =A1=AA Ross Callon<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;end snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>Link =
type in OSPF is not at all the same thing as level in IS-IS =A8C so I do =
not find that analogy appropriate:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>From <a =
href=3D"https://tools.ietf.org/html/rfc2328">https://tools.ietf.org/html/=
rfc2328</a> page 128<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Link type&nbsp;&nbsp; =
Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
__________________________________________________<o:p></o:p></span></i><=
/p><p class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span =
lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Point-to-point&nbsp;&nbsp;&nbsp; Neighbor Router =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link<o:p></o:p></span></i=
></p><p class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span =
lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to =
transit&nbsp;&nbsp; Interface address of<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
network&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Designated Router<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to =
stub&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IP network =
number<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
network<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Virtual =
link&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Neighbor Router =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Table 18: Link descriptions in =
the<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router-LSA.<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;end snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt; <b>On =
Behalf Of </b>Aijun Wang<br><b>Sent:</b> Sunday, January 05, 2020 8:03 =
PM<br><b>To:</b> <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br><b>Subject:</b> [Lsr] =
Is it necessary to expand the IS-IS level to =
8?<o:p></o:p></span></p></div></div><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Hi, Tony, Les and Paul: <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>As I read the draft <a =
href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarch=
y-00">https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-=
00</a>, and notice the proposal to expand the reserved bits in =
=A1=B0Circuit Type=A1=B1 to cover the level 1-8 in ISIS =
domain.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Here I just want to know is it necessary to expand the =
IS-IS level to 8 and occupy all the reserved bits in the PDU =
format?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>As compared with the OSPF format, there is one field to =
describe the =A1=B0Link Type=A1=B1 (5 bits, currently define only four =
types). We want to use the reserved bits in current =A1=B0Circuit =
Type=A1=B1 of ISIS PDU format to fulfill the similar tasks. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Can this draft leave at least 2 reserved bits for this =
purpose? There are many ways to tackle the scale of networks, who will =
design their network in level 8 hierarchy? As I estimated, Level 4 may =
be the acceptable highest network hierarchy.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></body></html>
------=_NextPart_000_012C_01D5C4AC.3F2FBD90--


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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 6 Jan 2020 11:57:38 +0100
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To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, lsr@ietf.org
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Subject: Re: [Lsr]  =?utf-8?b?562U5aSNOiBJcyBpdCBuZWNlc3NhcnkgdG8gZXhwYW5kIHRo?= =?utf-8?q?e_IS-IS_level_to_8=3F?=
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Aijun,


> We just want to distinguish the passive interfaces from other normal
> interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute Flag=
s=E2=80=9D that
> described in https://tools.ietf.org/html/rfc7794#section-2.1 is the most
> appropriate place to extend to carry such information.
>

Really ?

IMO much better place is to define new sub-TLV of TLV-22 and mark it there
as passive link.

Ref: https://tools.ietf.org/html/rfc5029

Now more interesting perhaps is to find out how ISIS is supposed to react
to such information. Or is the intention to carry it just as an opaque info
say for show commands use only ?

Thx,
R.

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<div dir=3D"ltr"><div class=3D"gmail_quote"><div>Aijun,</div><div>=C2=A0</d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"ZH-CN"><p=
 class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">We just want to d=
istinguish the passive interfaces from other normal interfaces within ISIS =
domain.=C2=A0 It seems that the =E2=80=9CAttribute Flags=E2=80=9D that desc=
ribed in </span><a href=3D"https://tools.ietf.org/html/rfc7794#section-2.1"=
 target=3D"_blank">https://tools.ietf.org/html/rfc7794#section-2.1</a><span=
 style=3D"color:rgb(31,73,125)"> is the most appropriate place to extend to=
 carry such information.</span><br></p></div></blockquote><div><br></div><d=
iv>Really ?</div><div><br></div><div>IMO much better place is to define new=
 sub-TLV of TLV-22 and mark it there as passive link.</div><div><br></div><=
div>Ref:=C2=A0<a href=3D"https://tools.ietf.org/html/rfc5029">https://tools=
.ietf.org/html/rfc5029</a></div><div><br></div><div>Now more interesting pe=
rhaps is to find out how ISIS is supposed to react to such information. Or =
is the intention to carry it just as an opaque info say for show commands u=
se only ?=C2=A0</div><div><br></div><div>Thx,<br>R.</div><div><br></div></d=
iv></div>

--000000000000ae4125059b7687f9--


From nobody Mon Jan  6 05:51:41 2020
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From: <bruno.decraene@orange.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Antoni Przygienda <prz@juniper.net>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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I support publication of the draft.

Improving interoperability is definitely something that I support (1), in p=
articular for mission critical protocols.

Thank you to authors & Alvaro for the work and the initiative.

Bruno

(1) Including during error conditions ;-)
=20
-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Thursday, January 2, 2020 8:07 PM
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps; Antoni Przygienda
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv

This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for draft-i=
etf-lsr-isis-invalid-tlv.

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

Tony P (other authors already responded during the adoption poll), please i=
ndicate your knowledge of any IPR related to this work to the list as well.

Thanks,
Chris & Acee.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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Support the publication

-----Original Message-----
From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
Sent: 03 January 2020 00:37
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Antoni Przygiend=
a <prz@juniper.net>
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv

This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for draft-i=
etf-lsr-isis-invalid-tlv.

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

Tony P (other authors already responded during the adoption poll), please i=
ndicate your knowledge of any IPR related to this work to the list as well.

Thanks,
Chris & Acee.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Is it necessary to expand the IS-IS level to 8?
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Subject: Re: [Lsr] Is it necessary to expand the IS-IS level to 8?
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Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-bfd-strict-mode
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The document is adopted.

Authors, please repost with the name draft-lsr-ospf-bfd-strict-mode-00.

Thanks,
Chris & Acee.

> On Dec 13, 2019, at 6:54 AM, Christian Hopps <chopps@chopps.org> =
wrote:
>=20
> Hi LSR WG and Draft Authors,
>=20
> This begins a 2 week WG adoption poll for the following draft:
>=20
>  =
https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-bfd-strict-mode/
>=20
> Please indicate your support or objection by Dec 27th.
>=20
> Authors, please respond indicating whether you are aware of any IPR =
that applies to this draft.
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20


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Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-bfd-strict-mode
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That should be draft-ietf-lsr-ospf-bfd-strict-mode

Thanks,
Chris.

> On Jan 6, 2020, at 1:18 PM, Christian Hopps <chopps@chopps.org> wrote:
>=20
> The document is adopted.
>=20
> Authors, please repost with the name =
draft-lsr-ospf-bfd-strict-mode-00.
>=20
> Thanks,
> Chris & Acee.
>=20
>> On Dec 13, 2019, at 6:54 AM, Christian Hopps <chopps@chopps.org> =
wrote:
>>=20
>> Hi LSR WG and Draft Authors,
>>=20
>> This begins a 2 week WG adoption poll for the following draft:
>>=20
>> =
https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-bfd-strict-mode/
>>=20
>> Please indicate your support or objection by Dec 27th.
>>=20
>> Authors, please respond indicating whether you are aware of any IPR =
that applies to this draft.
>>=20
>> Thanks,
>> Chris & Acee.
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>=20
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20


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Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-reverse-metric
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The document is adopted.

Authors, please post a new version with name =
draft-ietf-lsr-ospf-reverse-metric-00.

Thanks,
Chris.

> On Dec 13, 2019, at 6:28 AM, Christian Hopps <chopps@chopps.org> =
wrote:
>=20
> Hi LSR WG and Draft Authors,
>=20
> This begins a 2 week WG adoption poll for the following draft:
>=20
>  =
https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-reverse-metric/
>=20
> Please indicate your support or objection by Dec 27th.
>=20
> Authors, please respond indicating whether you are aware of any IPR =
that applies to this draft.
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20


From nobody Mon Jan  6 17:08:18 2020
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Subject: [Lsr] Methods to label the passive interfaces within ISIS
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Hi, Robert:

=20

Thanks for your information.

TLV-22 is used to describe the IS neighbor and the link between them. As =
for the passive interfaces, there may be no neighbor.=20

It seems the sub-TLV within this TLV is not the appropriate place to put =
this information?

=20

P.S. I changed the thread to reflect the conversion topic.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 =
18:58
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to =
expand the IS-IS level to 8?

=20

Aijun,

=20

We just want to distinguish the passive interfaces from other normal =
interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute =
Flags=E2=80=9D that described in =
https://tools.ietf.org/html/rfc7794#section-2.1 is the most appropriate =
place to extend to carry such information.

=20

Really ?

=20

IMO much better place is to define new sub-TLV of TLV-22 and mark it =
there as passive link.

=20

Ref: https://tools..ietf.org/html/rfc5029 =
<https://tools.ietf.org/html/rfc5029>=20

=20

Now more interesting perhaps is to find out how ISIS is supposed to =
react to such information. Or is the intention to carry it just as an =
opaque info say for show commands use only ?=20

=20

Thx,
R.

=20


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</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Robert:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks for your information.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>TLV-22 is used to describe the IS neighbor and the link between them. =
As for the passive interfaces, there may be no neighbor. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>It seems the sub-TLV within this TLV is not the appropriate place to =
put this information?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>P.S. I changed the thread to reflect the conversion =
topic.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt'>Robert Raszuk<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>6</span>=E6=97=A5<span =
lang=3DEN-US> 18:58<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Les Ginsberg (ginsberg); =
lsr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: Is it necessary to expand =
the IS-IS level to 8?<o:p></o:p></span></span></p></div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Aijun,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'color:#1F497D'>We just want to distinguish the =
passive interfaces from other normal interfaces within ISIS =
domain.&nbsp; It seems that the =E2=80=9CAttribute Flags=E2=80=9D that =
described in </span><span lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" =
target=3D"_blank">https://tools.ietf.org/html/rfc7794#section-2.1</a><spa=
n style=3D'color:#1F497D'> is the most appropriate place to extend to =
carry such =
information.</span><o:p></o:p></span></p></div></blockquote><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Really =
?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>IMO much better place is to define =
new sub-TLV of TLV-22 and mark it there as passive =
link.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Ref:&nbsp;<a =
href=3D"https://tools.ietf.org/html/rfc5029">https://tools..ietf.org/html=
/rfc5029</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Now more interesting perhaps is to =
find out how ISIS is supposed to react to such information. Or is the =
intention to carry it just as an opaque info say for show commands use =
only ?&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Thx,<br>R.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></div></div></body><=
/html>
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Hi, Les:

=20

You are right.  I investigate again the PDU format/purpose and found the =
IIH is not the right place to carry this information.

Let=E2=80=99s discuss the passive interface solution in another thread =
=E2=80=9CMethods to label the interfaces within ISIS=E2=80=9D.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Les Ginsberg (ginsberg)
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=887=E6=97=A5 =
0:27
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Is it necessary to expand the IS-IS level =
to 8?

=20

Aijun =E2=80=93

=20

Hmmm=E2=80=A6let me see if I understand you.

=20

You and some other folks have an as yet unpublished idea to use some of =
the bits in circuit type field and therefore you are not happy that the =
hierarchy draft will use all of the circuit-type bits for levels.

Is this correct??

=20

It is hard to comment on an unpublished idea =E2=80=93 but I would point =
out that the field being used for levels is a field in the header of =
PDUs =E2=80=93 and new PDUs at that. It is therefore hard to see how =
this is relevant to information about a particular interface which is =
always contained in a TLV =E2=80=93 not in the PDU header.

=20

If you are talking specifically about IIH PDUs, note that IIHs are never =
sent on passive interfaces.

=20

But it is hard to comment on an idea that you have yet to publish.

=20

   Les

=20

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>=20
Sent: Monday, January 06, 2020 12:14 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org
Subject: =E7=AD=94=E5=A4=8D: [Lsr] Is it necessary to expand the IS-IS =
level to 8?

=20

Hi, Les:

=20

We just want to distinguish the passive interfaces from other normal =
interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute =
Flags=E2=80=9D that described in =
https://tools.ietf.org/html/rfc7794#section-2.1 is the most appropriate =
place to extend to carry such information.

If so, we can write one draft to define one more attribute flag to =
accomplish this.

=20

Or, is there any other way to fulfill this task? Originally, I want to =
reuse the reserve bits before =E2=80=9CCircuit Type=E2=80=9D field.  It =
seems not the right direction.=20

=20

And on the other hand, occupying all the reserved bits for the =
unnecessary expansion is also not the right direction?=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Les Ginsberg (ginsberg)
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 =
12:52
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Is it necessary to expand the IS-IS level =
to 8?

=20

Aijun =E2=80=93

=20

Regarding the number of levels, Tony responded to a similar comment =
several months ago =E2=80=93 please see =
https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq6sYg

=20

<snip>

> It seems not necessary to have 8 levels of hierarchies. 3 or at most 4 =
levels of hierarchies should be enough. IS-IS with 3 levels of =
hierarchies may support a network with 1k*1k*1k nodes, which is about =
10^9 =3D 1 billion nodes. IS-IS with 4 levels of hierarchies may support =
a network with 1k*1k*1k*1k nodes, which is about 10^12 =3D 1 trillion =
nodes.

=20

=20

This is correct.  It=E2=80=99s not absolutely necessary. However, as =
Robert mentioned, it does give the network designer flexibility to =
create the hierarchy that matches the needs of his network.  The cost of =
the additional levels is very small, given that we=E2=80=99re =
considering adding any levels at all, so it seemed sensible to define =
all of the levels at once.

=20

=E2=80=9CFrom an architectural point of view, if a number isn=E2=80=99t =
obviously too large, then it=E2=80=99s probably too small.=E2=80=9D  =
=E2=80=94 Ross Callon

=20

<end snip>

=20

Link type in OSPF is not at all the same thing as level in IS-IS =
=E2=80=93 so I do not find that analogy appropriate:

=20

>From https://tools.ietf.org/html/rfc2328 page 128

=20

<snip>

Link type   Description       Link ID

                   __________________________________________________

                   1           Point-to-point    Neighbor Router ID

                               link

                   2           Link to transit   Interface address of

                               network           Designated Router

                   3           Link to stub      IP network number

                               network

                   4           Virtual link      Neighbor Router ID

=20

=20

                           Table 18: Link descriptions in the

                                      router-LSA.

<end snip>

=20

   Les

=20

=20

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Aijun Wang
Sent: Sunday, January 05, 2020 8:03 PM
To: lsr@ietf.org
Subject: [Lsr] Is it necessary to expand the IS-IS level to 8?

=20

Hi, Tony, Les and Paul:=20

=20

As I read the draft =
https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-00, =
and notice the proposal to expand the reserved bits in =E2=80=9CCircuit =
Type=E2=80=9D to cover the level 1-8 in ISIS domain.

Here I just want to know is it necessary to expand the IS-IS level to 8 =
and occupy all the reserved bits in the PDU format?

=20

As compared with the OSPF format, there is one field to describe the =
=E2=80=9CLink Type=E2=80=9D (5 bits, currently define only four types). =
We want to use the reserved bits in current =E2=80=9CCircuit =
Type=E2=80=9D of ISIS PDU format to fulfill the similar tasks.=20

=20

Can this draft leave at least 2 reserved bits for this purpose? There =
are many ways to tackle the scale of networks, who will design their =
network in level 8 hierarchy? As I estimated, Level 4 may be the =
acceptable highest network hierarchy.

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=20

=20

=20


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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi, Les:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>You are =
right.=C2=A0 I investigate again the PDU format/purpose and found the =
IIH is not the right place to carry this =
information.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'>Let=E2=80=99s discuss the passive =
interface solution in another thread =E2=80=9CMethods to label the =
interfaces within ISIS=E2=80=9D.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom</span><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E4=BB=A3=E8=A1=
=A8 </span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>Les Ginsberg =
(ginsberg)<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>7</span>=E6=97=A5<span =
lang=3DEN-US> 0:27<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; =
lsr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Is it necessary =
to expand the IS-IS level to =
8?<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'>Aijun =
=E2=80=93<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Hmmm=E2=80=A6let me see if I understand =
you.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>You and =
some other folks have an as yet unpublished idea to use some of the bits =
in circuit type field and therefore you are not happy that the hierarchy =
draft will use all of the circuit-type bits for =
levels.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Is this correct??<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>It is =
hard to comment on an unpublished idea =E2=80=93 but I would point out =
that the field being used for levels is a field in the header of PDUs =
=E2=80=93 and new PDUs at that. It is therefore hard to see how this is =
relevant to information about a particular interface which is always =
contained in a TLV =E2=80=93 not in the PDU =
header.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>If you =
are talking specifically about IIH PDUs, note that IIHs are never sent =
on passive interfaces.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>But it =
is hard to comment on an idea that you have yet to =
publish.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; <br><b>Sent:</b> Monday, January 06, 2020 12:14 AM<br><b>To:</b> Les =
Ginsberg (ginsberg) &lt;<a =
href=3D"mailto:ginsberg@cisco.com">ginsberg@cisco.com</a>&gt;; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br><b>Subject:</b> =
</span><span =
style=3D'font-size:11.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E7=AD=94=E5=A4=
=8D</span><span lang=3DEN-US style=3D'font-size:11.0pt'>: [Lsr] Is it =
necessary to expand the IS-IS level to =
8?<o:p></o:p></span></p></div></div><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'>Hi, Les:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>We just =
want to distinguish the passive interfaces from other normal interfaces =
within ISIS domain.&nbsp; It seems that the =E2=80=9CAttribute =
Flags=E2=80=9D that described in <a =
href=3D"https://tools.ietf.org/html/rfc7794#section-2.1">https://tools.ie=
tf.org/html/rfc7794#section-2.1</a> is the most appropriate place to =
extend to carry such information.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>If so, we =
can write one draft to define one more attribute flag to accomplish =
this.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Or, is =
there any other way to fulfill this task? Originally, I want to reuse =
the reserve bits before =E2=80=9CCircuit Type=E2=80=9D field.&nbsp; It =
seems not the right direction. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>And on the =
other hand, occupying all the reserved bits for the unnecessary =
expansion is also not the right direction? <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> <a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a> [<a =
href=3D"mailto:lsr-bounces@ietf.org">mailto:lsr-bounces@ietf.org</a>] =
</span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E4=BB=A3=E8=A1=
=A8 </span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>Les Ginsberg =
(ginsberg)<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>6</span>=E6=97=A5<span =
lang=3DEN-US> 12:52<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br></span><b>=E4=B8=BB=E9=A2=
=98<span lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Is it =
necessary to expand the IS-IS level to =
8?<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'>Aijun =
=E2=80=93<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Regarding the number of levels, Tony =
responded to a similar comment several months ago =E2=80=93 please see =
<a =
href=3D"https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq=
6sYg">https://mailarchive.ietf.org/arch/msg/lsr/dKJBcU59TNuY3rxgjd6iXIq6s=
Yg</a><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&gt; It seems not necessary to have 8 levels =
of hierarchies. 3 or at most 4 levels of hierarchies should be enough. =
IS-IS with 3 levels of hierarchies may support a network with 1k*1k*1k =
nodes, which is about 10^9 =3D 1 billion nodes. IS-IS with 4 levels of =
hierarchies may support a network with 1k*1k*1k*1k nodes, which is about =
10^12 =3D 1 trillion nodes.<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>This is correct.&nbsp; It=E2=80=99s not =
absolutely necessary. However, as Robert mentioned, it does give the =
network designer flexibility to create the hierarchy that matches the =
needs of his network.&nbsp; The cost of the additional levels is very =
small, given that we=E2=80=99re considering adding any levels at all, so =
it seemed sensible to define all of the levels at =
once.<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>=E2=80=9CFrom an architectural point of view, =
if a number isn=E2=80=99t obviously too large, then it=E2=80=99s =
probably too small.=E2=80=9D&nbsp; =E2=80=94 Ross =
Callon<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;end snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>Link =
type in OSPF is not at all the same thing as level in IS-IS =E2=80=93 so =
I do not find that analogy appropriate:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:11.0pt'>From <a =
href=3D"https://tools.ietf.org/html/rfc2328">https://tools.ietf.org/html/=
rfc2328</a> page 128<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>Link type&nbsp;&nbsp; =
Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
__________________________________________________<o:p></o:p></span></i><=
/p><p class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span =
lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Point-to-point&nbsp;&nbsp;&nbsp; Neighbor Router =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link<o:p></o:p></span></i=
></p><p class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span =
lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to =
transit&nbsp;&nbsp; Interface address of<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
network&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Designated Router<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Link to =
stub&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IP network =
number<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
network<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Virtual =
link&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Neighbor Router =
ID<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Table 18: Link descriptions in =
the<o:p></o:p></span></i></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router-LSA.<o:p></o:p></span></i></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><i><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&lt;end snip&gt;<o:p></o:p></span></i></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'>&nbsp;&nbsp; Les<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt; <b>On =
Behalf Of </b>Aijun Wang<br><b>Sent:</b> Sunday, January 05, 2020 8:03 =
PM<br><b>To:</b> <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br><b>Subject:</b> [Lsr] =
Is it necessary to expand the IS-IS level to =
8?<o:p></o:p></span></p></div></div><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Hi, Tony, Les and Paul: <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>As I read the draft <a =
href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarch=
y-00">https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-=
00</a>, and notice the proposal to expand the reserved bits in =
=E2=80=9CCircuit Type=E2=80=9D to cover the level 1-8 in ISIS =
domain.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Here I just want to know is it necessary to expand the =
IS-IS level to 8 and occupy all the reserved bits in the PDU =
format?<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>As compared with the OSPF format, there is one field to =
describe the =E2=80=9CLink Type=E2=80=9D (5 bits, currently define only =
four types). We want to use the reserved bits in current =
=E2=80=9CCircuit Type=E2=80=9D of ISIS PDU format to fulfill the similar =
tasks. <o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Can this draft leave at least 2 reserved bits for this =
purpose? There are many ways to tackle the scale of networks, who will =
design their network in level 8 hierarchy? As I estimated, Level 4 may =
be the acceptable highest network hierarchy.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></div></body></html>
------=_NextPart_000_0138_01D5C53A.660C6100--


From nobody Mon Jan  6 23:48:28 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-ospf-bfd-strict-mode-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : OSPF Strict-Mode for BFD
        Authors         : Ketan Talaulikar
                          Peter Psenak
                          Albert Fu
                          Rajesh M
	Filename        : draft-ietf-lsr-ospf-bfd-strict-mode-00.txt
	Pages           : 10
	Date            : 2020-01-06

Abstract:
   This document specifies the extensions to OSPF that enables a router
   and its neighbor to signal their intention to use Bidirectional
   Forwarding Detection (BFD) for their adjacency using link-local
   advertisement between them.  The signaling of this BFD enablement,
   allows the router to block and not allow the establishment of
   adjacency with its neighbor router until a BFD session is
   successfully established between them.  The document describes this
   OSPF "strict-mode" of BFD establishment as a prerequisite to
   adjacency formation.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-ospf-bfd-strict-mode/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-ospf-bfd-strict-mode-00
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-ospf-bfd-strict-mode-00


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : OSPF Reverse Metric
        Authors         : Ketan Talaulikar
                          Peter Psenak
                          Hugh Johnston
	Filename        : draft-ietf-lsr-ospf-reverse-metric-00.txt
	Pages           : 12
	Date            : 2020-01-06

Abstract:
   This document specifies the extensions to OSPF that enables a router
   to signal to its neighbor the metric that the neighbor should use
   towards itself using link-local advertisement between them.  The
   signalling of this reverse metric, to be used on link(s) towards
   itself, allows a router to influence the amount of traffic flowing
   towards itself and in certain use-cases enables routers to maintain
   symmetric metric on both sides of a link between them.



The IETF datatracker status page for this draft is:
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-ketant-lsr-ospf-reverse-metric@ietf.org" <draft-ketant-lsr-ospf-reverse-metric@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
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Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-reverse-metric
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Thanks Chris. We've just posted the WG version of this draft that was adopt=
ed.

-----Original Message-----
From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
Sent: 06 January 2020 23:51
To: lsr@ietf.org
Cc: draft-ketant-lsr-ospf-reverse-metric@ietf.org; lsr-ads@ietf.org; Christ=
ian Hopps <chopps@chopps.org>
Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-reverse-metri=
c

The document is adopted.

Authors, please post a new version with name draft-ietf-lsr-ospf-reverse-me=
tric-00.

Thanks,
Chris.

> On Dec 13, 2019, at 6:28 AM, Christian Hopps <chopps@chopps.org> wrote:
>=20
> Hi LSR WG and Draft Authors,
>=20
> This begins a 2 week WG adoption poll for the following draft:
>=20
>  https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-reverse-metric/
>=20
> Please indicate your support or objection by Dec 27th.
>=20
> Authors, please respond indicating whether you are aware of any IPR that =
applies to this draft.
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "draft-ketant-lsr-ospf-bfd-strict-mode@ietf.org" <draft-ketant-lsr-ospf-bfd-strict-mode@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-bfd-strict-mode
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Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-bfd-strict-mode
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Thanks Chris. We've just posted the WG version of this draft that was adopt=
ed.

-----Original Message-----
From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
Sent: 06 January 2020 23:49
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; draft-ketant-lsr=
-ospf-bfd-strict-mode@ietf.org
Subject: Re: [Lsr] WG Adoption Call for draft-ketant-lsr-ospf-bfd-strict-mo=
de

That should be draft-ietf-lsr-ospf-bfd-strict-mode

Thanks,
Chris.

> On Jan 6, 2020, at 1:18 PM, Christian Hopps <chopps@chopps.org> wrote:
>=20
> The document is adopted.
>=20
> Authors, please repost with the name draft-lsr-ospf-bfd-strict-mode-00.
>=20
> Thanks,
> Chris & Acee.
>=20
>> On Dec 13, 2019, at 6:54 AM, Christian Hopps <chopps@chopps.org> wrote:
>>=20
>> Hi LSR WG and Draft Authors,
>>=20
>> This begins a 2 week WG adoption poll for the following draft:
>>=20
>> https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-bfd-strict-mode/
>>=20
>> Please indicate your support or objection by Dec 27th.
>>=20
>> Authors, please respond indicating whether you are aware of any IPR that=
 applies to this draft.
>>=20
>> Thanks,
>> Chris & Acee.
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>=20
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 7 Jan 2020 11:13:58 +0100
Message-ID: <CAOj+MMHAbGo+0qd+xwTmymx4MYXGWmHe0p+d2ychQLQWUZ78wA@mail.gmail.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, lsr@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/oyoErdHb5bUQWwmN28ShFgBGOwc>
Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Aijun,

Right .. I took your email as an attempt/request to actually advertise
passive links in the first place.

May we know what difference does it make to you if reachable prefix is part
of an active vs passive interface from IGP point of view ?

Thx,
R.


On Tue, Jan 7, 2020 at 2:08 AM Aijun Wang <wangaijun@tsinghua.org.cn> wrote=
:

> Hi, Robert:
>
>
>
> Thanks for your information.
>
> TLV-22 is used to describe the IS neighbor and the link between them. As
> for the passive interfaces, there may be no neighbor.
>
> It seems the sub-TLV within this TLV is not the appropriate place to put
> this information?
>
>
>
> P.S. I changed the thread to reflect the conversion topic.
>
>
>
> Best Regards.
>
>
>
> Aijun Wang
>
> China Telecom
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i=
etf.org] *=E4=BB=A3=E8=A1=A8 *Robert
> Raszuk
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B41=E6=9C=886=E6=97=A5=
 18:58
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Aijun Wang
> *=E6=8A=84=E9=80=81:* Les Ginsberg (ginsberg); lsr@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to ex=
pand the IS-IS level to 8?
>
>
>
> Aijun,
>
>
>
> We just want to distinguish the passive interfaces from other normal
> interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute Flag=
s=E2=80=9D that
> described in https://tools.ietf.org/html/rfc7794#section-2.1 is the most
> appropriate place to extend to carry such information.
>
>
>
> Really ?
>
>
>
> IMO much better place is to define new sub-TLV of TLV-22 and mark it ther=
e
> as passive link.
>
>
>
> Ref: https://tools..ietf.org/html/rfc5029
> <https://tools.ietf.org/html/rfc5029>
>
>
>
> Now more interesting perhaps is to find out how ISIS is supposed to react
> to such information. Or is the intention to carry it just as an opaque in=
fo
> say for show commands use only ?
>
>
>
> Thx,
> R.
>
>
>

--00000000000053b00e059b8a0925
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div>Hi Aijun,</div><div><br></div>Right .. I took your=C2=
=A0email as an attempt/request=C2=A0to actually advertise passive links in =
the first place.=C2=A0<div><br></div><div><div>May we know what difference =
does it make to you if reachable prefix is part of an active vs passive int=
erface from IGP point of=C2=A0view ?=C2=A0</div><div><br></div><div>Thx,</d=
iv><div>R.</div><div><br></div></div></div><br><div class=3D"gmail_quote"><=
div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 7, 2020 at 2:08 AM Aijun W=
ang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org=
.cn</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x"><div lang=3D"ZH-CN"><div class=3D"gmail-m_818551677519142950WordSection1=
"><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi, Robert:<u></u><u></u>=
</span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:1=
0.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-si=
ze:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanks for y=
our information.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)">TLV-22 is used to describe the IS neighbor and the link betw=
een them. As for the passive interfaces, there may be no neighbor. <u></u><=
u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">It seems t=
he sub-TLV within this TLV is not the appropriate place to put this informa=
tion?<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-U=
S" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73=
,125)">P.S. I changed the thread to reflect the conversion topic.<u></u><u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-si=
ze:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=
=A0<u></u></span></p><p class=3D"MsoNormal" style=3D"text-align:justify"><s=
pan lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Best Regards.<u></u><u></u></span></p><p class=3D"Ms=
oNormal" style=3D"text-align:justify"><span lang=3D"EN-US" style=3D"font-si=
ze:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=
=A0<u></u></span></p><p class=3D"MsoNormal" style=3D"text-align:justify"><s=
pan lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Aijun Wang<u></u><u></u></span></p><p class=3D"MsoNo=
rmal" style=3D"text-align:justify"><span lang=3D"EN-US" style=3D"font-size:=
10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">China Telecom<u=
></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D=
"font-size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u><=
/u>=C2=A0<u></u></span></p><div style=3D"border-right:none;border-bottom:no=
ne;border-left:none;border-top:1pt solid rgb(181,196,223);padding:3pt 0cm 0=
cm"><p class=3D"MsoNormal"><b><span style=3D"font-size:10pt">=E5=8F=91=E4=
=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US"=
 style=3D"font-size:10pt"> <a href=3D"mailto:lsr-bounces@ietf.org" target=
=3D"_blank">lsr-bounces@ietf.org</a> [mailto:<a href=3D"mailto:lsr-bounces@=
ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a>] </span><b><span style=
=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 </span></b><span lang=3D"EN-US" styl=
e=3D"font-size:10pt">Robert Raszuk<br></span><b><span style=3D"font-size:10=
pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3D"EN-US">:</span></span=
></b><span lang=3D"EN-US" style=3D"font-size:10pt"> 2020</span><span style=
=3D"font-size:10pt">=E5=B9=B4<span lang=3D"EN-US">1</span>=E6=9C=88<span la=
ng=3D"EN-US">6</span>=E6=97=A5<span lang=3D"EN-US"> 18:58<br></span><b>=E6=
=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span lang=3D"EN-U=
S"> Aijun Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US">:</span>=
</b><span lang=3D"EN-US"> Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@ie=
tf.org" target=3D"_blank">lsr@ietf.org</a><br></span><b>=E4=B8=BB=E9=A2=98<=
span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"> Re: [Lsr] </span>=E7=
=AD=94=E5=A4=8D<span lang=3D"EN-US">: Is it necessary to expand the IS-IS l=
evel to 8?<u></u><u></u></span></span></p></div><p class=3D"MsoNormal"><spa=
n lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><div><div><div><p class=3D"=
MsoNormal"><span lang=3D"EN-US">Aijun,<u></u><u></u></span></p></div><div><=
p class=3D"MsoNormal"><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p><=
/div><blockquote style=3D"border-top:none;border-right:none;border-bottom:n=
one;border-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-l=
eft:4.8pt;margin-right:0cm"><div><p class=3D"MsoNormal"><span lang=3D"EN-US=
" style=3D"color:rgb(31,73,125)">We just want to distinguish the passive in=
terfaces from other normal interfaces within ISIS domain.=C2=A0 It seems th=
at the =E2=80=9CAttribute Flags=E2=80=9D that described in </span><span lan=
g=3D"EN-US"><a href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" tar=
get=3D"_blank">https://tools.ietf.org/html/rfc7794#section-2.1</a><span sty=
le=3D"color:rgb(31,73,125)"> is the most appropriate place to extend to car=
ry such information.</span><u></u><u></u></span></p></div></blockquote><div=
><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p=
></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US">Really ?<u></u><u><=
/u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u=
>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN=
-US">IMO much better place is to define new sub-TLV of TLV-22 and mark it t=
here as passive link.<u></u><u></u></span></p></div><div><p class=3D"MsoNor=
mal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p></div><div><p clas=
s=3D"MsoNormal"><span lang=3D"EN-US">Ref:=C2=A0<a href=3D"https://tools.iet=
f.org/html/rfc5029" target=3D"_blank">https://tools..ietf.org/html/rfc5029<=
/a><u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D=
"EN-US"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><s=
pan lang=3D"EN-US">Now more interesting perhaps is to find out how ISIS is =
supposed to react to such information. Or is the intention to carry it just=
 as an opaque info say for show commands use only ?=C2=A0<u></u><u></u></sp=
an></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0=
<u></u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US">Th=
x,<br>R.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span la=
ng=3D"EN-US"><u></u>=C2=A0<u></u></span></p></div></div></div></div></div><=
/blockquote></div>

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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi, Robert:
There are situations that we want to distinguish the passive interfaces from=
 the normal interfaces. I will try to write one draft in recent days to desc=
ribe it and for further discussion.

Thanks in advance.

Aijun Wang
China Telecom

> On Jan 7, 2020, at 18:14, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> =EF=BB=BF
> Hi Aijun,
>=20
> Right .. I took your email as an attempt/request to actually advertise pas=
sive links in the first place.=20
>=20
> May we know what difference does it make to you if reachable prefix is par=
t of an active vs passive interface from IGP point of view ?=20
>=20
> Thx,
> R.
>=20
>=20
>> On Tue, Jan 7, 2020 at 2:08 AM Aijun Wang <wangaijun@tsinghua.org..cn> wr=
ote:
>> Hi, Robert:
>>=20
>> =20
>>=20
>> Thanks for your information.
>>=20
>> TLV-22 is used to describe the IS neighbor and the link between them. As f=
or the passive interfaces, there may be no neighbor.
>>=20
>> It seems the sub-TLV within this TLV is not the appropriate place to put t=
his information?
>>=20
>> =20
>>=20
>> P.S. I changed the thread to reflect the conversion topic.
>>=20
>> =20
>>=20
>> Best Regards.
>>=20
>> =20
>>=20
>> Aijun Wang
>>=20
>> China Telecom
>>=20
>> =20
>>=20
>> =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org [mailto:lsr-bounces@iet=
f.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 1=
8:58
>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
>> =E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
>> =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to expa=
nd the IS-IS level to 8?
>>=20
>> =20
>>=20
>> Aijun,
>>=20
>> =20
>>=20
>> We just want to distinguish the passive interfaces from other normal inte=
rfaces within ISIS domain.  It seems that the =E2=80=9CAttribute Flags=E2=80=
=9D that described in https://tools.ietf.org/html/rfc7794#section-2.1 is the=
 most appropriate place to extend to carry such information.
>>=20
>> =20
>>=20
>> Really ?
>>=20
>> =20
>>=20
>> IMO much better place is to define new sub-TLV of TLV-22 and mark it ther=
e as passive link.
>>=20
>> =20
>>=20
>> Ref: https://tools..ietf.org/html/rfc5029
>>=20
>> =20
>>=20
>> Now more interesting perhaps is to find out how ISIS is supposed to react=
 to such information. Or is the intention to carry it just as an opaque info=
 say for show commands use only ?=20
>>=20
>> =20
>>=20
>> Thx,
>> R.
>>=20
>> =20
>>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

--Apple-Mail-B01CEAE7-6466-4AB8-BC6A-05CC055B9949
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Robert:<div>There are situations that w=
e want to distinguish the passive interfaces from the normal interfaces. I w=
ill try to write one draft in recent days to describe it and for further dis=
cussion.</div><div><br></div><div>Thanks in advance.<br><br><div dir=3D"ltr"=
>Aijun Wang<div>China Telecom</div></div><div dir=3D"ltr"><br><blockquote ty=
pe=3D"cite">On Jan 7, 2020, at 18:14, Robert Raszuk &lt;robert@raszuk.net&gt=
; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr=
">=EF=BB=BF<div dir=3D"ltr"><div>Hi Aijun,</div><div><br></div>Right .. I to=
ok your&nbsp;email as an attempt/request&nbsp;to actually advertise passive l=
inks in the first place.&nbsp;<div><br></div><div><div>May we know what diff=
erence does it make to you if reachable prefix is part of an active vs passi=
ve interface from IGP point of&nbsp;view ?&nbsp;</div><div><br></div><div>Th=
x,</div><div>R.</div><div><br></div></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 7, 2020 at 2:08 AM Aiju=
n Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.o=
rg..cn</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1=
ex"><div lang=3D"ZH-CN"><div class=3D"gmail-m_818551677519142950WordSection1=
"><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font=
-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi, Robert:<u></u><u></u></=
span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5=
pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>&nbsp;<u></u>=
</span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10=
.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanks for your in=
formation.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-U=
S" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,=
125)">TLV-22 is used to describe the IS neighbor and the link between them. A=
s for the passive interfaces, there may be no neighbor. <u></u><u></u></span=
></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;f=
ont-family:Calibri,sans-serif;color:rgb(31,73,125)">It seems the sub-TLV wit=
hin this TLV is not the appropriate place to put this information?<u></u><u>=
</u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-siz=
e:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>&nbsp;<=
u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-s=
ize:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">P.S. I chang=
ed the thread to reflect the conversion topic.<u></u><u></u></span></p><p cl=
ass=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family=
:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>&nbsp;<u></u></span></p><p c=
lass=3D"MsoNormal" style=3D"text-align:justify"><span lang=3D"EN-US" style=3D=
"font-size:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Best R=
egards.<u></u><u></u></span></p><p class=3D"MsoNormal" style=3D"text-align:j=
ustify"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,s=
ans-serif;color:rgb(31,73,125)"><u></u>&nbsp;<u></u></span></p><p class=3D"M=
soNormal" style=3D"text-align:justify"><span lang=3D"EN-US" style=3D"font-si=
ze:10.5pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Aijun Wang<u>=
</u><u></u></span></p><p class=3D"MsoNormal" style=3D"text-align:justify"><s=
pan lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;=
color:rgb(31,73,125)">China Telecom<u></u><u></u></span></p><p class=3D"MsoN=
ormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>&nbsp;<u></u></span></p><div style=3D"=
border-right:none;border-bottom:none;border-left:none;border-top:1pt solid r=
gb(181,196,223);padding:3pt 0cm 0cm"><p class=3D"MsoNormal"><b><span style=3D=
"font-size:10pt">=E5=8F=91=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></s=
pan></b><span lang=3D"EN-US" style=3D"font-size:10pt"> <a href=3D"mailto:lsr=
-bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a> [mailto:<a hre=
f=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a>=
] </span><b><span style=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 </span></b><sp=
an lang=3D"EN-US" style=3D"font-size:10pt">Robert Raszuk<br></span><b><span s=
tyle=3D"font-size:10pt">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3D"EN=
-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-size:10pt"> 2020<=
/span><span style=3D"font-size:10pt">=E5=B9=B4<span lang=3D"EN-US">1</span>=E6=
=9C=88<span lang=3D"EN-US">6</span>=E6=97=A5<span lang=3D"EN-US"> 18:58<br><=
/span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US">:</span></b><span l=
ang=3D"EN-US"> Aijun Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3D"EN-US=
">:</span></b><span lang=3D"EN-US"> Les Ginsberg (ginsberg); <a href=3D"mail=
to:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br></span><b>=E4=B8=BB=E9=
=A2=98<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"> Re: [Lsr] </spa=
n>=E7=AD=94=E5=A4=8D<span lang=3D"EN-US">: Is it necessary to expand the IS-=
IS level to 8?<u></u><u></u></span></span></p></div><p class=3D"MsoNormal"><=
span lang=3D"EN-US"><u></u>&nbsp;<u></u></span></p><div><div><div><p class=3D=
"MsoNormal"><span lang=3D"EN-US">Aijun,<u></u><u></u></span></p></div><div><=
p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<u></u><u></u></span></p></=
div><blockquote style=3D"border-top:none;border-right:none;border-bottom:non=
e;border-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left=
:4.8pt;margin-right:0cm"><div><p class=3D"MsoNormal"><span lang=3D"EN-US" st=
yle=3D"color:rgb(31,73,125)">We just want to distinguish the passive interfa=
ces from other normal interfaces within ISIS domain.&nbsp; It seems that the=
 =E2=80=9CAttribute Flags=E2=80=9D that described in </span><span lang=3D"EN=
-US"><a href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" target=3D"_=
blank">https://tools.ietf.org/html/rfc7794#section-2.1</a><span style=3D"col=
or:rgb(31,73,125)"> is the most appropriate place to extend to carry such in=
formation.</span><u></u><u></u></span></p></div></blockquote><div><p class=3D=
"MsoNormal"><span lang=3D"EN-US"><u></u>&nbsp;<u></u></span></p></div><div><=
p class=3D"MsoNormal"><span lang=3D"EN-US">Really ?<u></u><u></u></span></p>=
</div><div><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>&nbsp;<u></u><=
/span></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US">IMO much be=
tter place is to define new sub-TLV of TLV-22 and mark it there as passive l=
ink.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D=
"EN-US"><u></u>&nbsp;<u></u></span></p></div><div><p class=3D"MsoNormal"><sp=
an lang=3D"EN-US">Ref:&nbsp;<a href=3D"https://tools.ietf.org/html/rfc5029" t=
arget=3D"_blank">https://tools..ietf.org/html/rfc5029</a><u></u><u></u></spa=
n></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>&nbsp;<u=
></u></span></p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US">Now m=
ore interesting perhaps is to find out how ISIS is supposed to react to such=
 information. Or is the intention to carry it just as an opaque info say for=
 show commands use only ?&nbsp;<u></u><u></u></span></p></div><div><p class=3D=
"MsoNormal"><span lang=3D"EN-US"><u></u>&nbsp;<u></u></span></p></div><div><=
p class=3D"MsoNormal"><span lang=3D"EN-US">Thx,<br>R.<u></u><u></u></span></=
p></div><div><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>&nbsp;<u></u=
></span></p></div></div></div></div></div></blockquote></div>
<span>_______________________________________________</span><br><span>Lsr ma=
iling list</span><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org=
/mailman/listinfo/lsr</span><br></div></blockquote></div></body></html>=

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From nobody Wed Jan  8 10:14:50 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-extended-hierarchy-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IS-IS Extended Hierarchy
        Authors         : Tony Li
                          Les Ginsberg
                          Paul Wells
	Filename        : draft-ietf-lsr-isis-extended-hierarchy-01.txt
	Pages           : 19
	Date            : 2020-01-08

Abstract:
   The IS-IS routing protocol was originally defined with a two level
   hierarchical structure.  This was adequate for the networks at the
   time.  As we continue to expand the scale of our networks, it is
   apparent that additional hierarchy would be a welcome degree of
   flexibility in network design.

   This document defines IS-IS Levels 3 through 8.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-extended-hierarchy/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-isis-extended-hierarchy-01
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-extended-hierarchy-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-extended-hierarchy-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Subject: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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Hello

I have been monitoring using of IS-IS TLV16 on and off for seventeen
years but it seems that this past year I failed to notice it being
assigned to Reverse Metric.

My understanding is that there are now two separate IS-IS protocol
extensions now using TLV16.

The one from eighteen years ago is Automatic Encapsulation which was not
accepted by the IETF but was written into ITU-T G.7712.

The second is Reverse Metric.

However all is not lost.
Automatic Encapsulation specified the use of subTLVs and only ever
assigned SubTLV 1.
I notice that Reverse Metric appears to have subTLVs 1-17 listed as
Unassigned.

In my opinion the safest thing to do would be to update the IANA TLV
codepoint document and under the section "Sub-TLVs for TLV 16 (Reverse
Metric TLV)" simply mark subTLV 1 as something like "used in ITU G.7712".

This would make the situation 100% safe for Reverse Metric implementors
IMHO.  Provided that subTLV 1 is ignored then I think it wouldn't matter
if the million to one happened and an SDH/SONET optical network overhead
channel somehow got bridged to a modern IS-IS thing.  Probably if that
did happen then much worse stuff would happen anyway, like all of the
CLNP packets rushing off towards an Internet of nothing causing panic in
a telco ops room somewhere.  Or maybe a corporate network trying to
route itself down a SONET/SDH 128kb overhead channel.

I was tasked several years ago with trying to find an actual
implementation of Automatic Encapsulation and the only evidence that I
can find is a Vertel document here
http://www.vertel.com/docs/g7712.pdf
There was a rumour of one Telecom vendor building something but I could
not get to the bottom of it.
I know that Nortel was also working on an implementation for their
SONET/SDH multiplexers but my relationship (and probably my pension)
with them ended in 2003.  I have no idea if Nortel optical equipment is
actually still used in a live network.

Folks can read about G.7712 here
https://www.itu.int/rec/T-REC-G.7712-201908-I/en

Note that I do not speak on behalf of any standards group or company on
this matter.  It is purely a personal interest. I have since 2003
followed a completely different carrier path.

Also note that I have not done any serious amount of research or
checking into how Reverse Metric works or particularly read any of the
documents.

I hope that you are all still well. Happy new year.

Regards, Philip Christian, CEng, CISSP, London UK


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Sender: Tony Li <tony1athome@gmail.com>
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To: Philip Christian <philip.christian@christiantena.net>
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Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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> On Jan 8, 2020, at 10:55 AM, Philip Christian =
<philip.christian@christiantena.net> wrote:
>=20
> In my opinion the safest thing to do would be to update the IANA TLV
> codepoint document and under the section "Sub-TLVs for TLV 16 (Reverse
> Metric TLV)" simply mark subTLV 1 as something like "used in ITU =
G.7712".


This seems like it would bust every single implementation of reverse =
metric.

Given that you can=E2=80=99t find an implementation of Automatic =
Encapsulation and they never
filed anything with LSR (or IS-IS or IANA), why would we do that?

Seems to me like this is a problem for Automatic Encapsulation folks to =
figure out=E2=80=A6

Tony


--Apple-Mail=_BC1E3406-97E7-40D0-A6E0-910D51A52361
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jan 8, 2020, at 10:55 AM, Philip Christian &lt;<a =
href=3D"mailto:philip.christian@christiantena.net" =
class=3D"">philip.christian@christiantena.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">In my opinion the safest thing =
to do would be to update the IANA TLV</span><br style=3D"caret-color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">codepoint document and under the section "Sub-TLVs for TLV 16 =
(Reverse</span><br style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">Metric TLV)" =
simply mark subTLV 1 as something like "used in ITU G.7712".</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" =
class=3D""></div></blockquote></div><br class=3D""><div class=3D""><br =
class=3D""></div><div class=3D"">This seems like it would bust every =
single implementation of reverse metric.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Given that you can=E2=80=99t find an =
implementation of Automatic Encapsulation and they never</div><div =
class=3D"">filed anything with LSR (or IS-IS or IANA), why would we do =
that?</div><div class=3D""><br class=3D""></div><div class=3D"">Seems to =
me like this is a problem for Automatic Encapsulation folks to figure =
out=E2=80=A6</div><div class=3D""><br class=3D""></div><div =
class=3D"">Tony</div><div class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_BC1E3406-97E7-40D0-A6E0-910D51A52361--


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Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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[quote]they never filed anything with LSR (or IS-IS or IANA)[/quote]
In my defense I did try.

I also notice that Reverse Metric seems to use TLV 16 only in IIH and
that G.7712 only uses it in LSPs.

regards, Philip

On 08/01/2020 19:01, tony.li@tony.li wrote:
> 
> 
>> On Jan 8, 2020, at 10:55 AM, Philip Christian
>> <philip.christian@christiantena.net
>> <mailto:philip.christian@christiantena.net>> wrote:
>>
>> In my opinion the safest thing to do would be to update the IANA TLV
>> codepoint document and under the section "Sub-TLVs for TLV 16 (Reverse
>> Metric TLV)" simply mark subTLV 1 as something like "used in ITU G.7712".
> 
> 
> This seems like it would bust every single implementation of reverse metric.
> 
> Given that you can’t find an implementation of Automatic Encapsulation
> and they never
> filed anything with LSR (or IS-IS or IANA), why would we do that?
> 
> Seems to me like this is a problem for Automatic Encapsulation folks to
> figure out…
> 
> Tony
> 


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Philip Christian <philip.christian@christiantena.net>, "tony.li@tony.li" <tony.li@tony.li>
CC: "lsr@ietf.org" <lsr@ietf.org>, "chopps@chopps.org" <chopps@chopps.org>, "hannes@rtbrick.com" <hannes@rtbrick.com>
Thread-Topic: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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Date: Wed, 8 Jan 2020 19:46:46 +0000
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Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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From nobody Wed Jan  8 12:19:13 2020
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To: lsr@ietf.org, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, "chopps@chopps.org" <chopps@chopps.org>, "hannes@rtbrick.com" <hannes@rtbrick.com>
References: <2a46911a-e391-6de9-7175-25fc2e8d57cc@christiantena.net> <B0ADC6A7-6658-4865-BED3-C8480149AB75@tony.li> <7f448ebe-dde9-809f-4b9c-e637ec0ee5f5@christiantena.net> <DM6PR11MB2842385EBBC208B06B20EA0AC13E0@DM6PR11MB2842.namprd11.prod.outlook.com>
From: Philip Christian <philip.christian@christiantena.net>
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Date: Wed, 8 Jan 2020 20:18:59 +0000
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Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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Hello Les

I think we all know that option 1 is what will happen because no one
cares enough to bother with 2.  For the record TLV16 was assigned by
this group to autoencap at the time and the code point doc didn't exist
back then.  When the code point document was then invented I asked for
TLV16 to be reserved but was rebuffed.

The actual fact is that it probably doesn't matter because if anyone was
stupid enough to bridge a SONET/SDH IS-IS network to a modern IP router
network it would probably spectacularly explode anyway, and because I
suspect (but not 100% sure) that an autoencap network was ever actually
built.

So it just becomes a little piece of history and probably of no importance.

You never know when a similar scenario might happen in another
technology area though (one protocol, multiple standards orgs?) and so I
hope a little reminder is more valuable than annoying.  Maybe it isn't :-;

regards, Philip


On 08/01/2020 19:46, Les Ginsberg (ginsberg) wrote:
> Philip -
> 
> Always good to renew our acquaintance.
> 
> As the format of the TLV itself is different between Reverse Metric and Auto-Encap, simply reserving a sub-TLV code-point for Auto-Encap isn't sufficient.
> 
> Suggesting that one form of the TLV be used in IIHs(Reverse Metric) and another in LSPs(Autoencap) is a creative solution - but I think we could both agree this is  a hack and less than desirable.
> 
> I think realistically there are two paths which can be followed - the need for either of them is of course dependent on the existence of deployments of auto-encap.
> 
> 1)Auto-encap can continue to use TLV 16 so long as it never has to coexist with Reverse metric.
> It does so understanding that it is using a proprietary codepoint which has not been standardized.
> (Apologies to anyone in the ITU whom I have just offended.)
> 
> 2)If there is sufficient justification, ITU would need to apply for a new codepoint which could be added to the IANA registry.
> Existing implementations of auto-encap would need to introduce support for transition from the proprietary codepoint to the standard codepoint.
> 
> I respect your tireless advocacy for this functionality, but I think there needs to be some larger consensus before Option #2 could be considered.
> 
> Does this seem like a fair summary of options?
> 
>    Les
> 
> 
>> -----Original Message-----
>> From: Philip Christian <philip.christian@christiantena.net>
>> Sent: Wednesday, January 08, 2020 11:08 AM
>> To: tony.li@tony.li
>> Cc: lsr@ietf.org; Les Ginsberg (ginsberg) <ginsberg@cisco.com>;
>> chopps@chopps.org; hannes@rtbrick.com
>> Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS
>> TLV 16
>>
>> [quote]they never filed anything with LSR (or IS-IS or IANA)[/quote]
>> In my defense I did try.
>>
>> I also notice that Reverse Metric seems to use TLV 16 only in IIH and
>> that G.7712 only uses it in LSPs.
>>
>> regards, Philip
>>
>> On 08/01/2020 19:01, tony.li@tony.li wrote:
>>>
>>>
>>>> On Jan 8, 2020, at 10:55 AM, Philip Christian
>>>> <philip.christian@christiantena.net
>>>> <mailto:philip.christian@christiantena.net>> wrote:
>>>>
>>>> In my opinion the safest thing to do would be to update the IANA TLV
>>>> codepoint document and under the section "Sub-TLVs for TLV 16 (Reverse
>>>> Metric TLV)" simply mark subTLV 1 as something like "used in ITU G.7712".
>>>
>>>
>>> This seems like it would bust every single implementation of reverse
>> metric.
>>>
>>> Given that you can’t find an implementation of Automatic Encapsulation
>>> and they never
>>> filed anything with LSR (or IS-IS or IANA), why would we do that?
>>>
>>> Seems to me like this is a problem for Automatic Encapsulation folks to
>>> figure out…
>>>
>>> Tony
>>>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 


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To: lsr@ietf.org
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From: Philip Christian <philip.christian@christiantena.net>
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Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS TLV 16
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sorry I meant "never", not "ever". The n totally changes the meaning....

On 08/01/2020 20:18, Philip Christian wrote:
> Hello Les
> 
> I think we all know that option 1 is what will happen because no one
> cares enough to bother with 2.  For the record TLV16 was assigned by
> this group to autoencap at the time and the code point doc didn't exist
> back then.  When the code point document was then invented I asked for
> TLV16 to be reserved but was rebuffed.
> 
> The actual fact is that it probably doesn't matter because if anyone was
> stupid enough to bridge a SONET/SDH IS-IS network to a modern IP router
> network it would probably spectacularly explode anyway, and because I
> suspect (but not 100% sure) that an autoencap network was ever actually
> built.
> 
> So it just becomes a little piece of history and probably of no importance.
> 
> You never know when a similar scenario might happen in another
> technology area though (one protocol, multiple standards orgs?) and so I
> hope a little reminder is more valuable than annoying.  Maybe it isn't :-;
> 
> regards, Philip
> 
> 
> On 08/01/2020 19:46, Les Ginsberg (ginsberg) wrote:
>> Philip -
>>
>> Always good to renew our acquaintance.
>>
>> As the format of the TLV itself is different between Reverse Metric and Auto-Encap, simply reserving a sub-TLV code-point for Auto-Encap isn't sufficient.
>>
>> Suggesting that one form of the TLV be used in IIHs(Reverse Metric) and another in LSPs(Autoencap) is a creative solution - but I think we could both agree this is  a hack and less than desirable.
>>
>> I think realistically there are two paths which can be followed - the need for either of them is of course dependent on the existence of deployments of auto-encap.
>>
>> 1)Auto-encap can continue to use TLV 16 so long as it never has to coexist with Reverse metric.
>> It does so understanding that it is using a proprietary codepoint which has not been standardized.
>> (Apologies to anyone in the ITU whom I have just offended.)
>>
>> 2)If there is sufficient justification, ITU would need to apply for a new codepoint which could be added to the IANA registry.
>> Existing implementations of auto-encap would need to introduce support for transition from the proprietary codepoint to the standard codepoint.
>>
>> I respect your tireless advocacy for this functionality, but I think there needs to be some larger consensus before Option #2 could be considered.
>>
>> Does this seem like a fair summary of options?
>>
>>    Les
>>
>>
>>> -----Original Message-----
>>> From: Philip Christian <philip.christian@christiantena.net>
>>> Sent: Wednesday, January 08, 2020 11:08 AM
>>> To: tony.li@tony.li
>>> Cc: lsr@ietf.org; Les Ginsberg (ginsberg) <ginsberg@cisco.com>;
>>> chopps@chopps.org; hannes@rtbrick.com
>>> Subject: Re: [Lsr] RFC8500 Reverse Metric and ITU-T G.7712 both using IS-IS
>>> TLV 16
>>>
>>> [quote]they never filed anything with LSR (or IS-IS or IANA)[/quote]
>>> In my defense I did try.
>>>
>>> I also notice that Reverse Metric seems to use TLV 16 only in IIH and
>>> that G.7712 only uses it in LSPs.
>>>
>>> regards, Philip
>>>
>>> On 08/01/2020 19:01, tony.li@tony.li wrote:
>>>>
>>>>
>>>>> On Jan 8, 2020, at 10:55 AM, Philip Christian
>>>>> <philip.christian@christiantena.net
>>>>> <mailto:philip.christian@christiantena.net>> wrote:
>>>>>
>>>>> In my opinion the safest thing to do would be to update the IANA TLV
>>>>> codepoint document and under the section "Sub-TLVs for TLV 16 (Reverse
>>>>> Metric TLV)" simply mark subTLV 1 as something like "used in ITU G.7712".
>>>>
>>>>
>>>> This seems like it would bust every single implementation of reverse
>>> metric.
>>>>
>>>> Given that you can’t find an implementation of Automatic Encapsulation
>>>> and they never
>>>> filed anything with LSR (or IS-IS or IANA), why would we do that?
>>>>
>>>> Seems to me like this is a problem for Automatic Encapsulation folks to
>>>> figure out…
>>>>
>>>> Tony
>>>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 


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Subject: [Lsr] [Technical Errata Reported] RFC2328 (5956)
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The following errata report has been submitted for RFC2328,
"OSPF Version 2".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid5956

--------------------------------------
Type: Technical
Reported by: Marcelo Bustani <mbustani@gmail.com>

Section: 12.4.1

Original Text
-------------
Router-LSAs

If the state of the interface is Loopback, add a Type 3
link (stub network) as long as this is not an interface
to an unnumbered point-to-point network.  The Link ID
should be set to the IP interface address, the Link Data
set to the mask 0xffffffff (indicating a host route),
and the cost set to 0.

===================================
12.4.1.4.  Describing Point-to-MultiPoint interfaces

                For operational Point-to-MultiPoint interfaces, one or
                more link descriptions are added to the router-LSA as
                follows:

                o   A single Type 3 link (stub network) is added with
                    Link ID set to the router's own IP interface
                    address, Link Data set to the mask 0xffffffff
                    (indicating a host route), and cost set to 0.
=============================================================================
C.3 Router interface parameters
 
 Interface output cost
            The cost of sending a packet on the interface, expressed in
            the link state metric.  This is advertised as the link cost
            for this interface in the router's router-LSA. The interface
            output cost must always be greater than 0.


Corrected Text
--------------
"cost set to 0" to at least "greater than 0"

Notes
-----
The section 12.4.1 and 12.4.1.4 are inconsistent with the appendix c.3.

These both section we find the cost to stub networks have to be set to 0, but in appendix c.3 we see that the interfaces must have greater than 0.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC2328 (no draft string recorded)
--------------------------------------
Title               : OSPF Version 2
Publication Date    : April 1998
Author(s)           : J. Moy
Category            : INTERNET STANDARD
Source              : Open Shortest Path First IGP
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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=C2=A0Dear Authors:

Happy New Year!

I have finished reading this document, reviewing the e-mail archive
and all the various reviews and comments. =C2=A0Quoting one of the authors,
"it is essential that the two IGPs provide equivalent functionality"
[1] -- so I have considered draft-ietf-isis-te-app-09 in parallel with
this one (I'm sending out a separate yet very similar review for it).

In general, I think both drafts need some work. =C2=A0When appropriate, I
have used "[c]" to highlight comparisons. =C2=A0I tried to put equivalent
comments in both documents, but may have missed a few...

I have some significant concerns (see details inline) about this
document -- and as a result about the ISIS draft. =C2=A0I want to point out
a couple of them here:

(A) Deployment Considerations

This document contains what I would characterize as a "distributed"
Deployment Considerations section through =C2=A78, =C2=A79 and =C2=A710. =
=C2=A0There is a
lot of content, but I still made some comments inline about other
important information. =C2=A0Please consider consolidating all the
deployment-related information in one place. =C2=A0rfc5706 (specially =C2=
=A72)
may be useful, please take a look.

[c] This document does not include equivalent information to what is
in =C2=A77.* in the ISIS draft. =C2=A0Please consider "importing" it (or at
least making a reference).


(B) I was able to identify one significant functional difference which
warrants a discussion of the reason for it and maybe the pros/cons:

=C2=A0 =C2=A0=C2=A73 talks about the behavior when "both SABM Length and UD=
ABM Length are 0".
=C2=A0 =C2=A0This document makes the use of the attributes mandatory by all=
 applications
=C2=A0 =C2=A0(in conflict with =C2=A78.2) while the ISIS draft makes their =
use optional (=C2=A74.1).


I will wait for this review to be addressed before moving both
documents forward together.

Thanks!

Alvaro.

[1] https://mailarchive.ietf.org/arch/msg/ospf/7zkoaLfUe19JxTOWaKWO51wK9gg


[Line numbers from idnits.]

...
16	Abstract

18	 =C2=A0 Various link attributes have been defined in OSPF in the context=
 of
19	 =C2=A0 the MPLS Traffic Engineering (TE) and GMPLS. =C2=A0Since the ori=
ginal
20	 =C2=A0 RSVP-TE use case was defined, additional applications (e.g., SRT=
E,
21	 =C2=A0 LFA) have been defined which also make use of the link attribute
22	 =C2=A0 advertisements. =C2=A0This document defines how to distribute li=
nk
23	 =C2=A0 attributes in OSPFv2 and OSPFv3 for applications other than MPLS=
 TE
24	 =C2=A0 or GMPLS.

[c] This abstract is a lot more general, while the ISIS one provides
more specifics, including talking about RSVP-TE instead of MPLS TE...

[minor] It may not be obvious to all readers what the relationship is
between RSVP-TE and =C2=A0MPLS TE...


...
89	1. =C2=A0Introduction

91	 =C2=A0 Various link attributes have been defined in OSPFv2 [RFC2328] an=
d
92	 =C2=A0 OSPFv3 [RFC5340] in the context of the MPLS TE and GMPLS. =C2=A0=
All these
93	 =C2=A0 attributes are distributed by OSPFv2 as sub-TLVs of the Link-TLV
94	 =C2=A0 advertised in the OSPFv2 TE Opaque LSA [RFC3630]. =C2=A0In OSPFv=
3, they
95	 =C2=A0 are distributed as sub-TLVs of the Link-TLV advertised in the OS=
PFv3
96	 =C2=A0 Intra-Area-TE-LSA as defined in [RFC5329].

[nit] s/defined in OSPFv2/defined for OSPFv2

[nit] s/context of the MPLS/context of MPLS

[minor] "All these attributes..." =C2=A0Which attributes? =C2=A0I'm sure th=
e
references are made later, but since they are mentioned here first,
please put references here. =C2=A0[[c] The ISIS draft mentions the relevant
RFCs from the start.]

98	 =C2=A0 Many of these link attributes are useful outside of traditional =
MPLS
99	 =C2=A0 Traffic Engineering or GMPLS. =C2=A0This brings its own set of p=
roblems,
100	 =C2=A0 in particular how to distribute these link attributes in OSPFv2=
 and
101	 =C2=A0 OSPFv3 when MPLS TE and GMPLS are not deployed or are deployed =
in
102	 =C2=A0 parallel with other applications that use these link attributes=
.

[nit] "own set of problems" =C2=A0Are there others you want to highlight
besides the distribution?

[minor] What is an application? =C2=A0I think I can tell the difference
between an "application", as used in this document, and an
"application" as what the ART area does: "The ART area develops
application protocols and architectures in the IETF." [1] =C2=A0Please
define what an application is in the context of this document.

[1] https://datatracker.ietf.org/group/art/about/

[major] Related to applications... =C2=A0"distinction between link
attributes used by TE and link attributes used by other OSPFv2 or
OSPFv3 applications" [=C2=A72.1] =C2=A0Some of the other applications menti=
oned
(SRTE, for example) are also related to Traffic Engineering, so the
general use of TE and non-TE as a distinction is very confusing and
seems to assume the type of applications that can use the alternate
advertisement are limited to "non-TE" -- but I'm sure that is not the
objective. =C2=A0Please be clear in the use of general terms like TE.

[c] The ISIS draft seems to be more careful/explicit when pointing out
the difference.

[nit] s/distribute these link attributes...with other applications
that use these link attributes./distribute these link
attributes...with other applications that may use them.


...
124	1.1. =C2=A0Requirements notation

126	 =C2=A0 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL N=
OT",
127	 =C2=A0 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in=
 this
128	 =C2=A0 document are to be interpreted as described in [RFC2119].

[major] Use the rfc8174 template.

[c] Before starting with the solution, the ISIS draft has a section
("Legacy Advertisements") that talks about the current state. =C2=A0I
thought that was very helpful. =C2=A0An equivalent section in this case
would review (or at least point to) RFC3630, RFC5329, RFC7471,
RFC7684, RFC8362...


...
136	2.1. =C2=A0OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA

138	 =C2=A0 Extended Link Opaque LSAs as defined in [RFC7684] for OSPFv2 an=
d
139	 =C2=A0 Extended Router-LSAs [RFC8362] for OSPFv3 are used to advertise=
 link
140	 =C2=A0 attributes that are used by applications other then MPLS TE or =
GMPLS.
141	 =C2=A0 These LSAs were defined as a generic containers for distributio=
n of
142	 =C2=A0 the extended link attributes. =C2=A0There are several advantage=
s in using
143	 =C2=A0 them:

145	 =C2=A0 1. =C2=A0Advertisement of the link attributes does not make the=
 link part
146	 =C2=A0 =C2=A0 =C2=A0 of the TE topology. =C2=A0It avoids any conflicts=
 and is fully
147	 =C2=A0 =C2=A0 =C2=A0 compatible with [RFC3630] and [RFC5329].

149	 =C2=A0 2. =C2=A0The OSPFv2 TE Opaque LSA and OSPFv3 Intra-Area-TE-LSA =
remains
150	 =C2=A0 =C2=A0 =C2=A0 truly opaque to OSPFv2 and OSPFv3 as originally d=
efined in
151	 =C2=A0 =C2=A0 =C2=A0 [RFC3630] and [RFC5329] respectively. =C2=A0Their=
 contents are not
152	 =C2=A0 =C2=A0 =C2=A0 inspected by OSPF, that acts as a pure transport.

154	 =C2=A0 3. =C2=A0There is clear distinction between link attributes use=
d by TE and
155	 =C2=A0 =C2=A0 =C2=A0 link attributes used by other OSPFv2 or OSPFv3 ap=
plications.

[major] "used by TE" is ambiguous because SRTE, for example, is a form
of TE. =C2=A0Note that the TE term is used extensively throughout the
document...and it may cause that same type of confusion. =C2=A0The same
applies for the mention of "non-TE" later on... =C2=A0Please be explicit
and don't simply use TE/non-TE, but as necessary qualify the use.

157	 =C2=A0 4. =C2=A0All link attributes that are used by other application=
s are
158	 =C2=A0 =C2=A0 =C2=A0 advertised in a single LSA, the Extended Link Opa=
que LSA in
159	 =C2=A0 =C2=A0 =C2=A0 OSPFv2 or the OSPFv3 E-Router-LSA [RFC8362] in OS=
PFv3.

161	 =C2=A0 The disadvantage of this approach is that in rare cases, the sa=
me
162	 =C2=A0 link attribute is advertised in both the TE Opaque and Extended=
 Link
163	 =C2=A0 Attribute LSAs in OSPFv2 or the Intra-Area-TE-LSA and E-Router-=
LSA in
164	 =C2=A0 OSPFv3. =C2=A0Additionally, there will be additional standardiz=
ation
165	 =C2=A0 effort. =C2=A0However, this could also be viewed as an advantag=
e as the
166	 =C2=A0 non-TE use cases for the TE link attributes are documented and
167	 =C2=A0 validated by the LSR working group.

[minor] "...both the TE Opaque and Extended Link Attribute LSAs in
OSPFv2 or the Intra-Area-TE-LSA and E-Router-LSA in OSPFv3." =C2=A0It might
be good to introduce (maybe in the =C2=A72 introduction) how the
information is advertised today so that this makes sense to the casual
reader.

[nit] "Additionally, there will be additional standardization effort."
=C2=A0Not really a technical argument... =C2=A0Hopefully when attributes ar=
e
standardized in one case they will at the same time standardized for
using the alternate advertisement mechanism.

[major] "non-TE use cases" =C2=A0Same comment as above: SRTE is a form of
TE. =C2=A0Please either be specific and use MPLS TE/RSVP-TE, or clearly
define the terms somewhere so that readers understand that non-TE
still includes TE mechanisms like SRTE...

[nit] The last sentence is unnecessary.. =C2=A0The registration policy for
the registries is set at "IETF Review or IESG Approval", which means
that any RFC from any WG would be ok to register a new value (IETF
Review), and that there may even exist cases when an RFC is not needed
(IESG Approval)...and there are also ranges for Experimental Use and
FCFS. =C2=A0IOW, there is no guarantee that new attributes, or even the
rehashing of existing ones for "non-TE use cases" will even go through
the IETF, much less the lsr WG.

169	 =C2=A0 Extended Link Opaque LSA [RFC7684] and E-Router-LSA [RFC8362] a=
re
170	 =C2=A0 used to advertise any link attributes used for non-TE applicati=
ons in
171	 =C2=A0 OSPFv2 or OSPFv3 respectively, including those that have been
172	 =C2=A0 originally defined for TE applications.

[minor] Please include a forward reference to =C2=A74 somewhere.

[nit] This is the 3rd time that you mention this...

174	 =C2=A0 TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv=
2 TE
175	 =C2=A0 Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329].

[nit] Also mentioned above...

177	 =C2=A0 The format of the link attribute TLVs that have been defined fo=
r TE
178	 =C2=A0 applications will be kept unchanged even when they are used for=
 non-
179	 =C2=A0 TE applications. =C2=A0Unique code points will be allocated for=
 these TE
180	 =C2=A0 link attribute TLVs from the OSPFv2 Extended Link TLV Sub-TLV
181	 =C2=A0 Registry [RFC7684] and from the OSPFv3 Extended LSA Sub-TLV Reg=
istry
182	 =C2=A0 [RFC8362]. =C2=A0For each reused TLV, the code point will be de=
fined in an
183	 =C2=A0 IETF document along with the expected use-case(s).

[minor] s/Unique code points will be allocated.../Unique code points
are allocated...
Please also add a pointer to the IANA Considerations section here.

[major] "For each reused TLV, the code point will be defined in an
IETF document along with the expected use-case(s)." =C2=A0It sounds as if
the intent of this sentence is to set a requirement for future work.
However, as I mentioned above, the Registration Policy defined for the
registries don't support asking for any type of IETF documentation.

185	3. =C2=A0Advertisement of Application Specific Values

187	 =C2=A0 To allow advertisement of the application specific values of th=
e link
188	 =C2=A0 attribute, a new Application Specific Link Attributes (ASLA) su=
b-TLV
189	 =C2=A0 is defined. =C2=A0The ASLA sub-TLV is a sub-TLV of the OSPFv2 E=
xtended
190	 =C2=A0 Link TLV [RFC7471] and OSPFv3 Router-Link TLV [RFC8362].

[minor] s/RFC7471/RFC7684


...
221	 =C2=A0 =C2=A0 =C2=A0SABM Length: Standard Application Identifier Bit-M=
ask Length. =C2=A0It
222	 =C2=A0 =C2=A0 =C2=A0MUST be a multiple of 4 bytes. =C2=A0If the Standa=
rd Application Bit-
223	 =C2=A0 =C2=A0 =C2=A0Mask is not present, the Standard Application Bit-=
Mask Length MUST
224	 =C2=A0 =C2=A0 =C2=A0be set to 0.

[c] The ISIS draft defines the L-flag to indicate that the
"applications listed...MUST use the legacy advertisements". =C2=A0There is
no equivalent functionality here. =C2=A0Please see my comments about this
in =C2=A74.1 (of the ISIS draft).


...
231	 =C2=A0 =C2=A0 =C2=A0Standard Application Identifier Bit-Mask: Optional=
 set of bits,
232	 =C2=A0 =C2=A0 =C2=A0where each bit represents a single standard applic=
ation. =C2=A0Bits are
233	 =C2=A0 =C2=A0 =C2=A0defined in [I-D.ietf-isis-te-app], which also requ=
est a new IANA
234	 =C2=A0 =C2=A0 =C2=A0"Link Attribute Applications" registry under "Inte=
rior Gateway
235	 =C2=A0 =C2=A0 =C2=A0Protocol (IGP) Parameters" for them. =C2=A0The bit=
s are repeated here
236	 =C2=A0 =C2=A0 =C2=A0for informational purpose:

[minor] s/Bits are defined in [I-D.ietf-isis-te-app], which also
request a new IANA "Link Attribute Applications" registry under
"Interior Gateway Protocol (IGP) Parameters" for them./Bits are
defined in [I-D.ietf-isis-te-app].

238	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bit-0 (R-bit): RSVP TE

[nit] s/RSVP TE/RSVP-TE

240	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bit-1 (S-bit): Segment Routing TE

242	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Bit-2 (F-bit): Loop Free Alternate (LFA). =
=C2=A0Includes all LFA
243	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 types

[just wondering] Given that we're trying to future-proof... =C2=A0Can there
be cases where the link attributes for "normal" LFA, vs Remote LFA
(for example) might need to be different? =C2=A0Considering that part of
the justification for this work is the need to potentially advertise
different attributes per application, and given that the question
"what is meant by LFA?" came up more than once on the mailing list, I
guess the answer might be yes (at least for some use cases). =C2=A0Knowing
that the user has their own bits to play with, I'm sure they can
accommodate if the need comes up. =C2=A0 Just thinking out loud...


...
248	 =C2=A0 Standard Application Identifier Bits are defined/sent starting =
with
249	 =C2=A0 Bit 0. =C2=A0Additional bit definitions that are defined in the=
 future
250	 =C2=A0 SHOULD be assigned in ascending bit order so as to minimize the
251	 =C2=A0 number of octets that will need to be transmitted.

[major] "Additional bit definitions that may be defined in the future
SHOULD be assigned in ascending bit order so as to minimize the number
of octets that will need to be transmitted." =C2=A0This statement about
assignment belongs in the IANA Consideration section as part of the
instructions to IANA on how to manage the space.

[major] When would it be ok for IANA not to assign the values in
order? =C2=A0IOW, why is that a SHOULD and not a MUST?

[minor] Given the intent to minimize the transmissions, should there
be a statement standardizing that behavior? =C2=A0I'm thinking of something
like: "In order to minimize the number of octets transmitted, the
sender SHOULD/MUST (?) transmit only the minimum necessary amount of
information..." =C2=A0IOW, the assignment policy, and the ability to
advertise the *ABM Length is useless unless the sender takes advantage
of it.

253	 =C2=A0 User Defined Application Identifier Bits have no relationship t=
o
254	 =C2=A0 Standard Application bits and are NOT managed by IANA or any ot=
her
255	 =C2=A0 standards body. =C2=A0It is recommended that bits are used star=
ting with
256	 =C2=A0 Bit 0 so as to minimize the number of octets required to advert=
ise
257	 =C2=A0 all of them.

[nit] "all of them", what? =C2=A0s/all of them/any User Defined Application=
s.

259	 =C2=A0 Undefined bits in both Bit-Masks MUST be transmitted as 0 and M=
UST be
260	 =C2=A0 ignored on receipt. =C2=A0Bits that are NOT transmitted MUST be=
 treated as
261	 =C2=A0 if they are set to 0 on receipt.

[major] "Undefined bits MUST be transmitted as 0 and MUST be ignored
on receipt." =C2=A0What if the sender and the receiver support a different
set of applications? =C2=A0For example, suppose that the sender supports a
new application identified by the N-bit, and sets only that bit; the
receiver treats the N-bit as unknown (=3D undefined) and ignores it.
The result is that, for the receiver, there seems to be no indication
of an application. =C2=A0Is "no application" a valid indication, or should
at least one bit always be set?

Note that below the case is presented for when "neither the Standard
Application Bits nor the User Defined Application bits are set (i.e.,
both SABM Length and UDABM Length are 0)", but the condition is
different because the bits are not present (see my comment below).

[minor] Following on the previous comment... =C2=A0It seems that a
requirement is for the routers/nodes in the domain to agree on the
meaning of the bits: support the same Standard Applications and
interpret the User Defined bit mask the same way. =C2=A0Please add this
type of information to the potential new Deployment Considerations
Section.

[nit] "Bits that are NOT transmitted MUST be..." =C2=A0While I understand
what you mean, having Normative language for the behavior of things
that are not received doesn't seem appropriate. =C2=A0How about something
like this: "Any omitted bits MUST be..."?


...
271	 =C2=A0 The advantage of not making the Application Bit-Masks part of t=
he
272	 =C2=A0 attribute advertisement itself is that we can keep the format o=
f the
273	 =C2=A0 link attributes that have been defined previously and reuse the=
 same
274	 =C2=A0 format when advertising them in the ASLA sub-TLV.

[nit] s/we can keep the format of the link attributes that have been
defined previously and reuse the same format when advertising them in
the ASLA sub-TLV./the format of any previously defined link attributes
can be kept and reused when advertising them in the ASLA sub-TLV.

276	 =C2=A0 When neither the Standard Application Bits nor the User Defined
277	 =C2=A0 Application bits are set (i.e., both SABM Length and UDABM Leng=
th are
278	 =C2=A0 0) in the ASLA sub-TLV, then the link attributes included in it=
 MUST
279	 =C2=A0 be considered as being applicable to all applications.

[major] s/bits are set/bits are present
"set" gives the impression of them being "1"; it's different to have
them all be 0 than to have then not be there.

[major] The specification of what to do when "both SABM Length and
UDABM Length are 0" is inconsistent with =C2=A78.2. =C2=A0Please specify th=
e
behavior only once.

[c] The ISIS draft leaves open the possibility for applications to use
the attributes while this document makes it mandatory. I think this is
a significant functional difference.

281	 =C2=A0 If, however, another advertisement of the same link attribute
282	 =C2=A0 includes any Application Bit-Mask in the ASLA sub-TLV, applicat=
ions
283	 =C2=A0 that are listed in the Application Bit-Masks of such ASLA sub-T=
LV
284	 =C2=A0 SHOULD use the attribute advertisement which has the applicatio=
n
285	 =C2=A0 specific bit set in the Application Bit-Masks.

287	 =C2=A0 If the same application is listed in the Application Bit-Masks =
of
288	 =C2=A0 more then one ASLA sub-TLV, the application SHOULD use the firs=
t
289	 =C2=A0 advertisement and ignore any subsequent advertisements of the s=
ame
290	 =C2=A0 attribute. =C2=A0This situation SHOULD be logged as an error.

[major] For the first two SHOULDs (in the last two paragraphs: "SHOULD
use the attribute advertisement" and "SHOULD use the first
advertisement"). =C2=A0When is it ok to not do as specified? =C2=A0For exam=
ple,
are there specific considerations related to not selecting the first
advertisement? =C2=A0Why would a receiver not use the attribute
advertisement which has the application specific bit set? =C2=A0IOW, why
are these not MUSTs?

292	 =C2=A0 This document defines the initial set of link attributes that M=
UST
293	 =C2=A0 use ASLA sub-TLV if advertised in the OSPFv2 Extended Link TLV =
or in
294	 =C2=A0 the OSPFv3 Router-Link TLV. =C2=A0If the ASLA sub-TLV includes =
any link
295	 =C2=A0 attribute(s) NOT listed below, they MUST be ignored. =C2=A0Docu=
ments which
296	 =C2=A0 define new link attributes MUST state whether the new attribute=
s
297	 =C2=A0 support application specific values and as such MUST be adverti=
sed in
298	 =C2=A0 an ASLA sub-TLV. =C2=A0The link attributes that MUST be adverti=
sed in ASLA
299	 =C2=A0 sub-TLVs are:

[nit] s/use ASLA sub-TLV/use the ASLA sub-TLV

[major] "initial set of link attributes that MUST use [the] ASLA
sub-TLV if advertised..." =C2=A0 =C2=A0The second paragraph in this section=
 says
that "ASLA sub-TLV is an optional sub-TLV" -- that is a true
statement. =C2=A0However, the ASLA sub-TLV is (according to this paragraph)
mandatory when the link attributes are used.

Suggestion (for the second paragraph)>

=C2=A0 =C2=A0The ASLA sub-TLV is an optional sub-TLV and can appear multipl=
e times in the
=C2=A0 =C2=A0OSPFv2 Extended Link TLV and OSPFv3 Router-Link TLV. =C2=A0It =
MUST be present if
=C2=A0 =C2=A0any of the link attributes listed at the end on this section a=
re
=C2=A0 =C2=A0advertised. =C2=A0It has the following format:

301	 =C2=A0 =C2=A0 =C2=A0- Shared Risk Link Group

303	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Link Delay

305	 =C2=A0 =C2=A0 =C2=A0- Min/Max Unidirectional Link Delay

307	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Delay Variation

309	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Link Loss

311	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Residual Bandwidth

313	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Available Bandwidth

315	 =C2=A0 =C2=A0 =C2=A0- Unidirectional Utilized Bandwidth

317	 =C2=A0 =C2=A0 =C2=A0- Administrative Group

319	 =C2=A0 =C2=A0 =C2=A0- Extended Administrative Group

321	 =C2=A0 =C2=A0 =C2=A0- TE Metric

[minor] =C2=A0Please include references for the definition of these attribu=
tes.


323	4. =C2=A0Reused TE link attributes

325	 =C2=A0 This section defines the use case and code points from the OSPF=
v2
326	 =C2=A0 Extended Link TLV Sub-TLV Registry and OSPFv3 Extended LSA Sub-=
TLV
327	 =C2=A0 Registry for some of the link attributes that have been origina=
lly
328	 =C2=A0 defined for TE or GMPLS.

[minor] "defines the...code points" =C2=A0The code points are
assigned/defined by IANA later on.. =C2=A0 Perhaps: "This section defines
the use cases and indicates the code points (see Section 12)..."


...
408	4.4. =C2=A0TE Metric

410	 =C2=A0 [RFC3630] defines TE Metric.

[minor] rfc3630 calls it "Traffic Engineering Metric"


...
417	5. =C2=A0Maximum Link Bandwidth

[nit] Include the application independent attributes in a single
section -- a sub-section each.

419	 =C2=A0 Maximum link bandwidth is an application independent attribute =
of the
420	 =C2=A0 link that is defined in [RFC3630]. =C2=A0Because it is an appli=
cation
421	 =C2=A0 independent attribute, it MUST NOT be advertised in ASLA sub-TL=
V.
422	 =C2=A0 Instead, it MAY be advertised as a sub-TLV of the Extended Link
423	 =C2=A0 Opaque LSA Extended Link TLV in OSPFv2 [RFC7684] or sub-TLV of =
OSPFv3
424	 =C2=A0 E-Router-LSA Router-Link TLV in OSPFv3 [RFC8362].

[minor] I understand why the "Maximum link bandwidth is an application
independent attribute of the link". =C2=A0But I am having a harder time
understanding why other bandwidth-related metrics (specifically
Unidirectional Residual Bandwidth, Unidirectional Available Bandwidth
and Unidirectional Utilized Bandwidth) are not treated the same way.
A similar question was raised on the list and the treatment was
justified in order to support use cases where the bandwidth is managed
per application [1]. =C2=A0I don't want to revisit the discussion here
about the treatment, but it is important for the reader to understand
the existence of those use cases. =C2=A0Please add a paragraph or two
talking about the consideration.

[1] https://mailarchive.ietf.org/arch/msg/ospf/xl8HWDeQqYNcv_X_568-xv6rfvk

[minor] This attribute and other bandwidth-related ones are prone to
interaction as multiple applications may want to use the resources.
While the use of the resources is out of scope, it would be helpful to
include that type of information in a Deployment Considerations
section.

[c] A related point was made when reviewing the ISIS draft [1].

[1] https://mailarchive.ietf.org/arch/msg/isis-wg/2M2pho1EZcVTkOOQssLQUVO0H=
Y4


...
[minor][c] The ISIS draft also calls out the Maximum Reservable Link
Bandwidth and Unreserved Bandwidth as attributes specific to
RSVP-TE...but this document doesn't [=C2=A74.2.2]. =C2=A0Why? =C2=A0I think=
 the
answer has to do with this text from =C2=A72.1:

=C2=A0 =C2=A0TE link attributes used for RSVP-TE/GMPLS continue to use OSPF=
v2 TE
=C2=A0 =C2=A0Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329].

Is that correct?

If so, it wasn't completely clear to me that the sub-TLVs defined in
rfc3630 and rfc5329 continue to be advertised when using
RSVP-TE/GMPLS.

- It might be worth including stronger wording in =C2=A72.1.

- Given that some of the sub-TLVs (from rfc3630 and rfc5329) are
reused (=C2=A74.3 through =C2=A77), maybe it is worth providing some guidan=
ce on
not using those if RSVP-TE is the only application, or avoiding their
inclusion in the original LSAs.


434	6. =C2=A0Local Interface IPv6 Address Sub-TLV

[major] The Local/Remote Interface IPv6 Address Sub-TLVs (rfc5329) can
include multiple addresses for a link. =C2=A0It seems to me that it could
be possible for different applications to use different addresses. =C2=A0If
that is the case, then it seems that these sub-TLVs should not be
application independent. =C2=A0Why are they not considered to be
application specific?

[minor] Why are IPv4 addresses not considered?


...
460	8.1. =C2=A0Use of TE LSA Advertisements

[c] I made the same comments in =C2=A75.1 of the ISIS draft.

462	 =C2=A0 Bit Identifers for Standard Applications are defined in Section=
 3.
463	 =C2=A0 All of the identifiers defined in this document are associated =
with
464	 =C2=A0 applications which were already deployed in some networks prior=
 to
465	 =C2=A0 the writing of this document. =C2=A0Therefore, such application=
s have been
466	 =C2=A0 deployed using the TE LSA advertisements. =C2=A0The Standard Ap=
plications
467	 =C2=A0 defined in this document MAY continue to use TE LSA advertiseme=
nts
468	 =C2=A0 for a given link so long as at least one of the following condi=
tions
469	 =C2=A0 is true:

[nit] s/Identifers/Identifiers

[major] Even if specifying the behavior for the Standard Applications,
this document cannot Normatively specify anything affecting the case
where "applications have been deployed using the legacy
advertisements". =C2=A0s/MAY/may

[] I think that the text in this section can be generalized to any
application, not just ones defined in this document. =C2=A0s/The Standard
Applications defined in this document MAY continue/The Standard
Applications may continue

471	 =C2=A0 =C2=A0 =C2=A0The application is RSVP-TE

473	 =C2=A0 =C2=A0 =C2=A0The application is SRTE or LFA and RSVP-TE is not =
deployed
474	 =C2=A0 =C2=A0 =C2=A0anywhere in the network

476	 =C2=A0 =C2=A0 =C2=A0The application is SRTE or LFA, RSVP-TE is deploye=
d in the
477	 =C2=A0 =C2=A0 =C2=A0network, and both the set of links on which SRTE a=
nd/or LFA
478	 =C2=A0 =C2=A0 =C2=A0advertisements are required and the attribute valu=
es used by SRTE
479	 =C2=A0 =C2=A0 =C2=A0and/or LFA on all such links is fully congruent wi=
th the links and
480	 =C2=A0 =C2=A0 =C2=A0attribute values used by RSVP-TE

[] To generalize:

=C2=A0 =C2=A0o =C2=A0A single application is deployed in the network

=C2=A0 =C2=A0o =C2=A0Multiple applications are deployed in the network and =
all the links and
=C2=A0 =C2=A0 =C2=A0 attribute values are fully congruent between them.

482	 =C2=A0 Under the conditions defined above, implementations which suppo=
rt the
483	 =C2=A0 extensions defined in this document have the choice of using TE=
 LSA
484	 =C2=A0 advertisements or application specific advertisements in suppor=
t of
485	 =C2=A0 SRTE and/or LFA. =C2=A0This will require implementations to pro=
vide
486	 =C2=A0 controls specifying which type of advertisements are to be sent=
/
487	 =C2=A0 processed on receive for these applications. =C2=A0Further disc=
ussion of
488	 =C2=A0 the associated issues can be found in Section 10.

[] To generalize: s/in support of SRTE and/or LFA/in support of other
applications

490	 =C2=A0 New applications which future documents define to make use of t=
he
491	 =C2=A0 advertisements defined in this document MUST NOT make use of TE=
 LSA
492	 =C2=A0 advertisements.

[major] Why not? =C2=A0Just as the cases above, the application may run my
itself on the network, and/or the attributes may be fully congruent.

494	8.2. =C2=A0Use of Zero Length Application Identifier Bit Masks

[minor] This section is partially redundant with the behavior
specified in =C2=A73. =C2=A0Please make the specification only once.

496	 =C2=A0 If link attributes are advertised associated with zero length
497	 =C2=A0 Application Identifier Bit-Masks for both standard applications=
 and
498	 =C2=A0 user defined applications, then that set of link attributes MAY=
 be
499	 =C2=A0 used by any application. =C2=A0If support for a new application=
 is
500	 =C2=A0 introduced on any node in a network in the presence of such
501	 =C2=A0 advertisements, these advertisements MAY be used by the new
502	 =C2=A0 application. =C2=A0If this is not what is intended, then existi=
ng
503	 =C2=A0 advertisements MUST be readvertised with an explicit set of
504	 =C2=A0 applications specified before a new application is introduced.

[major] s/MAY be used/may be used
It is just a statement of fact...

506	9. =C2=A0Attribute Advertisements and Enablement

[c] This section is pretty much the same in both drafts. =C2=A0Consider
making the specification only once (maybe in the ISIS draft -- because
the applications are defined there) and then referencing it. =C2=A0Note the
generalization comment below.


...
517	 =C2=A0 In the case of RSVP-TE, the advertisement of application specif=
ic
518	 =C2=A0 link attributes implies that RSVP is enabled on that link. =C2=
=A0The
519	 =C2=A0 absence of RSVP-TE application specific link attributes in
520	 =C2=A0 combination with the absence of legacy advertisements implies t=
hat
521	 =C2=A0 RSVP is NOT enabled on that link.

[minor] Specifying by implication sounds confusing to me. =C2=A0Can we come
up with Normative language to accompany the text above?

Suggestion>
=C2=A0 =C2=A0The R-bit in the SABM MUST be set only if RSVP is enabled on t=
he
=C2=A0 =C2=A0corresponding link. =C2=A0All RSVP-enabled links MUST have a c=
orresponding link
=C2=A0 =C2=A0attributes advertisement.

523	 =C2=A0 In the case of SRTE, advertisement of application specific link
524	 =C2=A0 attributes does NOT indicate enablement of SRTE. =C2=A0The adve=
rtisements
525	 =C2=A0 are only used to support constraints which may be applied when
526	 =C2=A0 specifying an explicit path. =C2=A0SRTE is implicitly enabled o=
n all links
527	 =C2=A0 which are part of the Segment Routing enabled topology independ=
ent of
528	 =C2=A0 the existence of link attribute advertisements.

530	 =C2=A0 In the case of LFA, advertisement of application specific link
531	 =C2=A0 attributes does NOT indicate enablement of LFA on that link.
532	 =C2=A0 Enablement is controlled by local configuration.

534	 =C2=A0 If, in the future, additional standard applications are defined=
 to
535	 =C2=A0 use this mechanism, the specification defining this use MUST de=
fine
536	 =C2=A0 the relationship between application specific link attribute
537	 =C2=A0 advertisements and enablement for that application.

[] To generalize:

Suggestion>
=C2=A0 =C2=A0For Standard Applications, advertisement of application specif=
ic link
=C2=A0 =C2=A0attributes does NOT indicate enablement of the application on =
that link. =C2=A0If
=C2=A0 =C2=A0additional Standard Applications are defined with a different =
enablement
=C2=A0 =C2=A0expectation, then the corresponding specification MUST define =
the alternate
=C2=A0 =C2=A0relationship between application specific link attribute adver=
tisements and
=C2=A0 =C2=A0enablement for that application.

539	 =C2=A0 This document allows the advertisement of application specific =
link
540	 =C2=A0 attributes with no application identifiers i.e., both the Stand=
ard
541	 =C2=A0 Application Identifier Bit-Mask and the User Defined Applicatio=
n Bit
542	 =C2=A0 Mask are not present (See Section 3). =C2=A0This supports the u=
se of the
543	 =C2=A0 link attribute by any application. =C2=A0In the presence of an =
application
544	 =C2=A0 where the advertisement of link attribute advertisements is use=
d to
545	 =C2=A0 infer the enablement of an application on that link (e.g., RSVP=
-TE),
546	 =C2=A0 the absence of the Application Identifier leaves ambiguous whet=
her
547	 =C2=A0 that application is enabled on such a link. =C2=A0This needs to=
 be
548	 =C2=A0 considered when making use of the "any application" encoding.

[major] What does the use of the "any application" encoding say about
RSVP-TE? =C2=A0My interpretation is that if RSVP-TE is used, then the "any
application" encoding can't be used. =C2=A0Is that correct? =C2=A0Please be
specific.

550	10. =C2=A0Backward Compatibility

[major] This section talks about the case where legacy advertisements
are already in use. =C2=A0This document cannot Normatively define what
those deployments do, because by definition they are not necessarily
implementing this specification. =C2=A0IOW, phrases like "OSPF routers in
that domain SHOULD continue to advertise" are out of place.

[] Instead of trying to fix the text, I believe that the =C2=A78.1 already
covers the scenarios discussed here. =C2=A0Also, please consider
"importing" the 7.* sub-sections from the ISIS draft.


...
556	 =C2=A0 In fact, there is at least one OSPF implementation that utilize=
s the
557	 =C2=A0 link attributes advertised in TE Opaque LSAs [RFC3630] for Non-=
RSVP
558	 =C2=A0 TE applications. =C2=A0For example, this implementation of LFA =
and remote
559	 =C2=A0 LFA utilizes links attributes such as Shared Risk Link Groups (=
SRLG)
560	 =C2=A0 [RFC4203] and Admin Group [[RFC3630] advertised in TE Opaque LS=
As.
561	 =C2=A0 These applications are described in [RFC5286], [RFC7490], [RFC7=
916]
562	 =C2=A0 and [RFC8102].

[nit] s/Non-RSVP TE/Non-RSVP-TE

564	 =C2=A0 When an OSPF routing domain includes routers using link attribu=
tes
565	 =C2=A0 from the OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA =
for
566	 =C2=A0 Non-RSVP TE applications defined in this document (i.e. =C2=A0S=
RTE and
567	 =C2=A0 LFA), OSPF routers in that domain SHOULD continue to advertise =
such
568	 =C2=A0 OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA. =C2=A0In=
 such a
569	 =C2=A0 deployment, the advertised attributes SHOULD be the same and No=
n-
570	 =C2=A0 RSVP application access to link attributes is a matter of local
571	 =C2=A0 policy.

[nit] s/Non-RSVP TE/Non-RSVP-TE

[nit] s/Non-RSVP/Non-RSVP-TE

573	 =C2=A0 When advertising link-attributes for any new applications other=
 then
574	 =C2=A0 RSVP-TE, SRTE or LFA, OSPF routers MUST NOT use TE Opaque LSA o=
r
575	 =C2=A0 OSPFv3 Intra-Area-TE-LSA. =C2=A0Instead, advertisement in the O=
SPFv2
576	 =C2=A0 Extended Link Attributes LSAs or OSPFv3 E-Router-LSA MUST be us=
ed.

[major] (A similar statement was made in =C2=A78.1.) =C2=A0Why? =C2=A0Just =
as the
cases from =C2=A78.1, the application may run my itself on the network,
and/or the attributes may be fully congruent.

578	 =C2=A0 It is RECOMMENDED to advertise link-attributes for RSVP-TE in t=
he
579	 =C2=A0 existing TE LSAs.

[major] When is it ok to not do so? =C2=A0IOW, why isn't it "REQUIRED"?
I'm asking this question as a matter of process, but the conditions
laid out in =C2=A78.1 seems to already answer the question. =C2=A0As I ment=
ioned
above, the cases in this section seem to already be covered in =C2=A78.1.

581	11. =C2=A0Security Considerations
...
591	 =C2=A0 Implementations MUST assure that malformed TLV and Sub-TLV defi=
ned in
592	 =C2=A0 this document are detected and do not provide a vulnerability f=
or
593	 =C2=A0 attackers to crash the OSPF router or routing process. =C2=A0Re=
ception of
594	 =C2=A0 a malformed TLV or Sub-TLV SHOULD be counted and/or logged for
595	 =C2=A0 further analysis. =C2=A0Logging of malformed TLVs and Sub-TLVs =
SHOULD be
596	 =C2=A0 rate-limited to prevent a Denial of Service (DoS) attack (distr=
ibuted
597	 =C2=A0 or otherwise) from overloading the OSPF control plane.

[major] "Implementations MUST assure that malformed TLV and Sub-TLV
defined in this document are detected and do not provide a
vulnerability for attackers to crash the OSPF router or routing
process." =C2=A0How can this be Normatively enforced? =C2=A0How is the
individual ability of an implementation to avoid crashes required for
interoperability? =C2=A0IOW, I don't think you can use "MUST" in the
sentence above. =C2=A0s/MUST/must

[major] What about vulnerabilities introduced by this document? =C2=A0This
document doesn't define new TE-related attributes, just a new way to
advertise them...perhaps include something like this:

=C2=A0 =C2=A0This document defines a new way to advertise already defined T=
E Attributes.
=C2=A0 =C2=A0As the ASLA sub-TLV is not used for SPF computation or normal =
routing, the
=C2=A0 =C2=A0extensions specified here have no direct effect on IP routing.=
 =C2=A0Tampering
=C2=A0 =C2=A0with the information defined in this document may have an effe=
ct on
=C2=A0 =C2=A0applications using it, including potential sub-optimal Traffic=
 Engineering.
=C2=A0 =C2=A0This is not new...see [RFC5305], [RFC5307], [RFC6119], and [RF=
C8570].

And then there are other possible vulnerabilities introduced by the
new encodings... =C2=A0For example, a rogue router can render the data
unusable by setting the incorrect bit-mask... =C2=A0At best, this action
could result in sub-optimal paths (by taking some links out of
consideration)... =C2=A0Consider adding text related to that.

599	12. =C2=A0IANA Considerations

601	12.1. =C2=A0OSPFv2

603	 =C2=A0 OSPFv2 Extended Link TLV Sub-TLVs registry [RFC7684] defines su=
b-TLVs
604	 =C2=A0 at any level of nesting for OSPFv2 Extended Link TLVs. =C2=A0Th=
is
605	 =C2=A0 specification updates OSPFv2 Extended Link TLV sub-TLVs registr=
y with
606	 =C2=A0 the following TLV types:

[nit] s/OSPFv2 Extended Link TLV/The OSPFv2 Extended Link TLV

[major] s/This specification updates OSPFv2 Extended Link TLV sub-TLVs
registry with the following TLV types:/IANA has assigned the following
TLV types:

...
633	12.2. =C2=A0OSPFv3

635	 =C2=A0 OSPFv3 Extended LSA Sub-TLV Registry [RFC8362] defines sub-TLVs=
 at
636	 =C2=A0 any level of nesting for OSPFv3 Extended LSAs. =C2=A0This speci=
fication
637	 =C2=A0 updates OSPFv3 Extended LSA Sub-TLV Registry with the following=
 TLV
638	 =C2=A0 types:

[nit] s/OSPFv3 Extended LSA Sub-TLV/The OSPFv3 Extended LSA Sub-TLV

[major] s/This specification updates OSPFv3 Extended LSA Sub-TLV
Registry with the following TLV types:/IANA has assigned the following
TLV types:


...
737	15.2. =C2=A0Informative References

[major] These references should be Normative:

739	 =C2=A0 [I-D.ietf-isis-te-app]
740	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ginsberg, L., Psenak, =
P., Previdi, S., Henderickx, W., and
741	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0J. Drake, "IS-IS TE At=
tributes per application", draft-
742	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ietf-isis-te-app-08 (w=
ork in progress), October 2019.

744	 =C2=A0 [RFC2328] =C2=A0Moy, J., "OSPF Version 2", STD 54, RFC 2328,
745	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC2328, =
April 1998,
746	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-edito=
r.org/info/rfc2328>.

748	 =C2=A0 [RFC4203] =C2=A0Kompella, K., Ed. and Y. Rekhter, Ed., "OSPF Ex=
tensions in
749	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Support of Generalized=
 Multi-Protocol Label Switching
750	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(GMPLS)", RFC 4203, DO=
I 10.17487/RFC4203, October 2005,
751	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-edito=
r.org/info/rfc4203>.
...
776	 =C2=A0 [RFC7471] =C2=A0Giacalone, S., Ward, D., Drake, J., Atlas, A., =
and S.
777	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Previdi, "OSPF Traffic=
 Engineering (TE) Metric
778	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Extensions", RFC 7471,=
 DOI 10.17487/RFC7471, March 2015,
779	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<https://www.rfc-edito=
r.org/info/rfc7471>.


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Dear Authors:

Happy New Year!

I have finished reading this document, reviewing the e-mail archive
and all the various reviews and comments. =C2=A0Quoting one of the authors,
"it is essential that the two IGPs provide equivalent functionality"
[1] -- so I have considered draft-ietf-ospf-te-link-attr-reuse-10 in
parallel with this one (I'm sending out a separate yet very similar
review for it).

In general, I think both drafts need some work. =C2=A0When appropriate, I
have used "[c]" to highlight comparisons. =C2=A0I tried to put equivalent
comments in both documents, but may have missed a few...

I have some significant concerns (see details inline) about this
document -- and as a result about the OSPF draft. =C2=A0I want to point out
a couple of them here:

(A) Deployment Considerations

This document contains what I would characterize as a "distributed"
Deployment Considerations section through =C2=A75, =C2=A76 and =C2=A77. =C2=
=A0There is a
lot of content, but I still made some comments in-line about other
important information. =C2=A0Please consider consolidating all the
deployment-related information in one place. =C2=A0rfc5706 (specially =C2=
=A72)
may be useful, please take a look.


(B) I was able to identify one significant functional difference which
warrants a discussion of the reason for it and maybe the pros/cons:

=C2=A0 =C2=A0=C2=A74.1 talks about the behavior when "both SABM Length and =
UDABM Length are
=C2=A0 =C2=A0zero". =C2=A0This document makes the use of the attributes opt=
ional while the
=C2=A0 =C2=A0OSPF draft mandates their use (=C2=A73).


I will wait for this review to be addressed before moving both
documents forward together.

Thanks!

Alvaro.

[1] https://mailarchive.ietf.org/arch/msg/ospf/7zkoaLfUe19JxTOWaKWO51wK9gg


[Line numbers from idnits.]


idnits 2.16.02

...
16	Abstract

18	 =C2=A0 Existing traffic engineering related link attribute advertisemen=
ts
19	 =C2=A0 have been defined and are used in RSVP-TE deployments. =C2=A0Sin=
ce the
20	 =C2=A0 original RSVP-TE use case was defined, additional applications (=
e.g.,
21	 =C2=A0 SRTE, LFA) have been defined which also make use of the link
22	 =C2=A0 attribute advertisements. =C2=A0In cases where multiple applicat=
ions wish
23	 =C2=A0 to make use of these link attributes the current advertisements =
do
24	 =C2=A0 not support application specific values for a given attribute no=
r do
25	 =C2=A0 they support indication of which applications are using the
26	 =C2=A0 advertised value for a given link.

[minor] Expand SRTE and LFA.

28	 =C2=A0 This draft introduces new link attribute advertisements which ad=
dress
29	 =C2=A0 both of these shortcomings. =C2=A0It also discusses backwards
30	 =C2=A0 compatibility issues and how to minimize duplicate advertisement=
s in
31	 =C2=A0 the presence of routers which do not support the extensions defi=
ned
32	 =C2=A0 in this document.

[nit] s/draft/document

[c] The OSPF abstract is more general, while this one provides more specifi=
cs...


...
107	1. =C2=A0Introduction

109	 =C2=A0 Advertisement of link attributes by the Intermediate-System-to-
110	 =C2=A0 Intermediate-System (IS-IS) protocol in support of traffic
111	 =C2=A0 engineering (TE) was introduced by [RFC5305] and extended by
112	 =C2=A0 [RFC5307], [RFC6119], and [RFC8570]. =C2=A0Use of these extensi=
ons has
113	 =C2=A0 been associated with deployments supporting Traffic Engineering=
 over
114	 =C2=A0 Multiprotocol Label Switching (MPLS) in the presence of Resourc=
e
115	 =C2=A0 Reservation Protocol (RSVP) - more succinctly referred to as RS=
VP-TE.

[nit] s/presence of Resource/presence of the Resource

[minor] Please add a reference for RSVP-TE.

117	 =C2=A0 In recent years new applications have been introduced which hav=
e use
118	 =C2=A0 cases for many of the link attributes historically used by RSVP=
-TE.
119	 =C2=A0 Such applications include Segment Routing Traffic Engineering (=
SRTE)
120	 =C2=A0 and Loop Free Alternates (LFA). =C2=A0This has introduced ambig=
uity in
121	 =C2=A0 that if a deployment includes a mix of RSVP-TE support and SRTE
122	 =C2=A0 support (for example) it is not possible to unambiguously indic=
ate
123	 =C2=A0 which advertisements are to be used by RSVP-TE and which
124	 =C2=A0 advertisements are to be used by SRTE. =C2=A0If the topologies =
are fully
125	 =C2=A0 congruent this may not be an issue, but any incongruence leads =
to
126	 =C2=A0 ambiguity.

[minor] What is an application? =C2=A0From the examples above I think I can
tell the difference between an "application", as used in this
document, and an "application" as what the ART area does: "The ART
area develops application protocols and architectures in the IETF."
[1] Please define what an application is in the context of this
document.

[1] https://datatracker.ietf.org/group/art/about/

[minor] Add references for SRTE and LFA...and any use
cases/requirements that support the need (or a forward reference to
=C2=A72, for this last point). =C2=A0All Informational.


...
177	3. =C2=A0Legacy Advertisements

179	 =C2=A0 There are existing advertisements used in support of RSVP-TE. =
=C2=A0These
180	 =C2=A0 advertisements include sub-TLVs for TLVs 22, 23, 25, 141, 222, =
and
181	 =C2=A0 223 and TLVs for SRLG advertisement.

[minor] Expand SRLG on first use.

[minor] Please add references to where all the values in this section
are defined...if the same as the references above.

183	3.1. =C2=A0Legacy sub-TLVs
184	 =C2=A0 Sub-TLVs for TLVs 22, 23, 25, 141, 222, and 223

186	 =C2=A0 Code Point/Attribute Name
187	 =C2=A0 --------------------------
188	 =C2=A0 =C2=A03 Administrative group (color)
189	 =C2=A0 =C2=A09 Maximum link bandwidth
190	 =C2=A0 10 Maximum reservable link bandwidth
191	 =C2=A0 11 Unreserved bandwidth
192	 =C2=A0 14 Extended Administrative Group
193	 =C2=A0 18 TE Default Metric
194	 =C2=A0 33 Unidirectional Link Delay
195	 =C2=A0 34 Min/Max Unidirectional Link Delay
196	 =C2=A0 35 Unidirectional Delay Variation
197	 =C2=A0 36 Unidirectional Link Loss
198	 =C2=A0 37 Unidirectional Residual Bandwidth
199	 =C2=A0 38 Unidirectional Available Bandwidth
200	 =C2=A0 39 Unidirectional Utilized Bandwidth

[nit] To be consistent with the registry, rename the headings to Type
and Description.

[nit] A Table could be nice.


...
231	4.1. =C2=A0Application Identifier Bit Mask

233	 =C2=A0 Identification of the set of applications associated with link
234	 =C2=A0 attribute advertisements utilizes two bit masks. =C2=A0One bit =
mask is for
235	 =C2=A0 standard applications where the definition of each bit is defin=
ed in
236	 =C2=A0 a new IANA controlled registry. =C2=A0A second bit mask is for =
non-
237	 =C2=A0 standard User Defined Applications(UDAs).

[nit] s/Applications(UDAs)/Applications (UDAs)

[minor] Include a forward reference to the IANA Considerations.

[minor] "second bit mask is for non-standard User Defined
Applications" =C2=A0The explicit point is made here that the UDAs are used
for *non-standard* applications. =C2=A0Given that these bits are for *user
defined* applications, the user can make the bits mean anything they
want (including SRTE, LFA, etc.), right? =C2=A0If so, then highlighting
*non-standard* seems not to be needed. =C2=A0 s/for non-standard User
Defined Applications/for User Defined Applications

[c] The OSPF draft doesn't make the same emphasis.


...
262	 =C2=A0 =C2=A0 =C2=A0L-flag: When set, applications listed (both Standa=
rd
263	 =C2=A0 =C2=A0 =C2=A0 and User Defined) MUST use the legacy advertiseme=
nts
264	 =C2=A0 =C2=A0 =C2=A0 for the corresponding link found in TLVs 22, 23,
265	 =C2=A0 =C2=A0 =C2=A0 25, 141, 222, and 223 or TLV 138 or TLV 139 as
266	 =C2=A0 =C2=A0 =C2=A0 appropriate.

[major] The corollary seems to be that if the L-flag is not set then
the applications MUST (?) use the Application Specific Link Attributes
sub-TLV. =C2=A0Is that correct? =C2=A0Please be specific.

[major] In a mixed network, where some routers support this
specification, but other don't, it seems that setting the L-flag would
be useful as all applications would "fall back" to the legacy
advertisements. =C2=A0However, not setting the L-flag seems to have the
potential for the routers to use different information resulting in
(at best) inconsistent decisions if the values are not the same.

[minor] I think that some of the issues related to whether all nodes
support something or not is an operational/deployment consideration;
it should be made clear (in the Deployment Considerations section)
what the requirements are inside a domain. =C2=A0I would think that the
support requirements change depending on the deployment model -- what
are the assumptions?

268	 =C2=A0 =C2=A0 =C2=A0SABM Length: Indicates the length in octets (0-127=
) of the
269	 =C2=A0 =C2=A0 =C2=A0 Bit Mask for Standard Applications.

[minor] s/Bit Mask for Standard Applications/Standard Application
Identifier Bit Mask


...
283	 =C2=A0 =C2=A0 =C2=A0UDABM Length: Indicates the length in octets (0-12=
7) of the
284	 =C2=A0 =C2=A0 =C2=A0 Bit Mask for User Defined Applications.

[minor] s/Bit Mask for User Defined Applications/User Defined
Application Identifier Bit Mask

286	 =C2=A0 SABM =C2=A0(variable length)
287	 =C2=A0 =C2=A0 =C2=A0Standard Application Identifier Bit Mask

289	 =C2=A0 =C2=A0 =C2=A0(SABM Length * 8) bits

291	 =C2=A0 =C2=A0 =C2=A0This is omitted if SABM Length is 0.

[nit] s/This is omitted/This field is omitted/g


...
303	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 F-bit: Set to specify Loop Free Alternate =
(LFA)
304	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(includes all LFA types)

[just wondering] Given that we're trying to future-proof... =C2=A0Can there
be cases where the link attributes for "normal" LFA, vs Remote LFA
(for example) might need to be different? =C2=A0Considering that part of
the justification for this work is the need to potentially advertise
different attributes per application, and given that the question
"what is meant by LFA?" came up more than once on the mailing list, I
guess the answer might be yes (at least for some use cases). =C2=A0Knowing
that the user has their own bits to play with, I'm sure they can
accommodate if the need comes up. =C2=A0 Just thinking out loud...

306	 =C2=A0 =C2=A0UDABM =C2=A0(variable length)
307	 =C2=A0 =C2=A0 =C2=A0User Defined Application Identifier Bit Mask

309	 =C2=A0 =C2=A0 =C2=A0(UDABM Length * 8) bits

311	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0 1 2 3 4 5 6 7 ...
312	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+...
313	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0...
314	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+-+-+-+-+-+-+-+-+...

316	 =C2=A0 =C2=A0 =C2=A0This is omitted if UDABM Length is 0.

318	 =C2=A0 NOTE: If both SABM Length and UDABM Length are zero, then the
319	 =C2=A0 attributes associated with this Attribute Identifier Bit Mask
320	 =C2=A0 MAY be used by any Standard Application and any User Defined
321	 =C2=A0 Application.

[major] This is what happens today: any application can use the
attributes, but they don't have to, right? =C2=A0I think that the MAY
(Normative) is not needed because it is not really specifying a
behavior that requires interoperability...but it is just mentioning a
fact. =C2=A0s/MAY/may

[major] [c] The OSPF draft makes it mandatory for all applications to
use the attributes when no bits are set while this document makes it
optional. =C2=A0I think this is a significant functional difference.

[minor] The same behavior is specified (again!) in =C2=A75.2; please
specify it only once.

323	 =C2=A0 Standard Application Identifier Bits are defined/sent starting =
with
324	 =C2=A0 Bit 0. =C2=A0Additional bit definitions that may be defined in =
the future
325	 =C2=A0 SHOULD be assigned in ascending bit order so as to minimize the
326	 =C2=A0 number of octets that will need to be transmitted. =C2=A0Undefi=
ned bits
327	 =C2=A0 MUST be transmitted as 0 and MUST be ignored on receipt. =C2=A0=
Bits that
328	 =C2=A0 are NOT transmitted MUST be treated as if they are set to 0 on
329	 =C2=A0 receipt.

[major] "Additional bit definitions that may be defined in the future
SHOULD be assigned in ascending bit order so as to minimize the number
of octets that will need to be transmitted." =C2=A0This statement about
assignment belongs in the IANA Consideration section as part of the
instructions to IANA on how to manage the space.

[major] When would it be ok for IANA not to assign the values in
order? =C2=A0IOW, why is that a SHOULD and not a MUST?

[minor] Given the intent to minimize the transmissions, should there
be a statement standardizing that behavior? =C2=A0I'm thinking of something
like: "In order to minimize the number of octets transmitted, the
sender SHOULD transmit only the minimum necessary amount of
information..." =C2=A0IOW, the assignment policy, and the ability to
advertise the *ABM Length is useless unless the sender takes advantage
of it.

[major] "Undefined bits MUST be transmitted as 0 and MUST be ignored
on receipt." =C2=A0What if the sender and the receiver support a different
set of applications? =C2=A0For example, suppose that the sender supports a
new application identified by the N-bit, and sets only that bit; the
receiver treats the N-bit as undefined and ignores it. =C2=A0The result is
that, for the receiver, there seems to be no indication of an
application. =C2=A0Is "no application" a valid indication, or should at
least one bit always be set?

[minor] Following on the previous comment... =C2=A0It seems that a
requirement is for the routers/nodes in the domain to agree on the
meaning of the bits: support the same Standard Applications and
interpret the User Defined bit mask the same way. =C2=A0Please add this
type of information to the Deployment Considerations Section.

[nit] "Bits that are NOT transmitted MUST be..." =C2=A0While I understand
what you mean, having Normative language for the behavior of things
that are not received doesn't seem appropriate. =C2=A0How about something
like this: "Any omitted bits MUST be..."?


...
337	4.2. =C2=A0Application Specific Link Attributes sub-TLV
...
343	 =C2=A0 =C2=A0 =C2=A0Type: 16 (temporarily assigned by IANA)
344	 =C2=A0 =C2=A0 =C2=A0Length: Variable (1 octet)

[major] I hope I'm missing something... =C2=A0The maximum Length is 254
octets, but the Application Identifier Bit Masks (both together) could
be as big as 256 octets. =C2=A0I realize that (1) it'll take a while (a
long while) before so many applications are defined, and (2) the SABM
and UDABM fields can be advertised in different sub-TLVs. =C2=A0It might be
a good idea to say something about separating the
advertisements...given that the assignment of values is the only
protection against someone forcing the advertisement of all the
bits...

345	 =C2=A0 =C2=A0 =C2=A0Value:

347	 =C2=A0 =C2=A0 =C2=A0 =C2=A0Application Identifier Bit Mask
348	 =C2=A0 =C2=A0 =C2=A0 =C2=A0(as defined in Section 4.1)

350	 =C2=A0 =C2=A0 =C2=A0 =C2=A0Link Attribute sub-sub-TLVs - format matche=
s the
351	 =C2=A0 =C2=A0 =C2=A0 =C2=A0existing formats defined in [RFC5305] and [=
RFC8570]

353	 =C2=A0 When the L-flag is set in the Application Identifier Bit Mask, =
all of
354	 =C2=A0 the applications specified in the bit mask MUST use the link
355	 =C2=A0 attribute sub-TLV advertisements listed in Section 3.1 for the
356	 =C2=A0 corresponding link. =C2=A0Link attribute sub-sub-TLVs for the
357	 =C2=A0 corresponding link attributes MUST NOT be advertised for the se=
t of
358	 =C2=A0 applications specified in the Standard/User Application Identif=
ier
359	 =C2=A0 Bit Masks and all such advertisements MUST be ignored on receip=
t.

[major] "When the L-flag is set...MUST use the link attribute sub-TLV
advertisements listed in Section 3.1"

(a) The behavior of the L-flag is already specified in =C2=A74.1. =C2=A0Ple=
ase
only specify behaviors in one place.

(b) The specification here is not the same as what =C2=A74.1 says. =C2=A0Th=
e
text in =C2=A74.1 says that "legacy advertisements for the corresponding
link found in TLVs 22, 23, 25, 141, 222, and 223 or TLV 138 or TLV
139", which I interpret as using any current or new (!) sub-TLVs for
those TLVs. =C2=A0OTOH, the text in this section limits the use to the
"link attribute sub-TLV advertisements listed in Section 3.1". =C2=A0 I'm
assuming the correct specification is the one in =C2=A74.1. =C2=A0IOW, this
document doesn't preclude continued extensions to RFC5305, RFC5307,
RFC6119, or RFC8570, right?

[?] Just to make sure I understand: "Link attribute sub-sub-TLVs for
the corresponding link attributes MUST NOT be advertised..." =C2=A0This
means that if the L-flag is set, all the attributes will be advertised
using legacy means, right?

361	 =C2=A0 Multiple Application Specific Link Attribute sub-TLVs for the s=
ame
362	 =C2=A0 link MAY be advertised. =C2=A0When multiple sub-TLVs for the sa=
me link are
363	 =C2=A0 advertised, they SHOULD advertise non-conflicting application/
364	 =C2=A0 attribute pairs. =C2=A0A conflict exists when the same applicat=
ion is
365	 =C2=A0 associated with two different values of the same link attribute=
 for a
366	 =C2=A0 given link. =C2=A0In cases where conflicting values for the sam=
e
367	 =C2=A0 application/attribute/link are advertised all the conflicting v=
alues
368	 =C2=A0 MUST be ignored.

370	 =C2=A0 For a given application, the setting of the L-flag MUST be the =
same
371	 =C2=A0 in all sub-TLVs for a given link. =C2=A0In cases where this con=
straint is
372	 =C2=A0 violated, the L-flag MUST be considered set for this applicatio=
n.

[major] Tying these two paragraphs together... =C2=A0If one of the sub-TLVs
has the L-flag set, then all the sub-TLVs that include at least one
common application MUST be considered as having the L-flag set as
well. =C2=A0This seems to become an attack vector: a rogue IS can set the
L-flag (and/or set application bits) in all/some of the
sub-TLVs...which may result in no attribute information (if the
sub-sub-TLVs were the only source of information and are ignored) for
a link...

374	 =C2=A0 A new registry of sub-sub-TLVs is to be created by IANA which d=
efines
375	 =C2=A0 the link attribute sub-sub-TLV code points. =C2=A0This document=
 defines a
376	 =C2=A0 sub-sub-TLV for each of the existing sub-TLVs listed in Section=
 3.1
377	 =C2=A0 except as noted below. =C2=A0The format of the sub-sub-TLVs mat=
ches the
378	 =C2=A0 format of the corresponding legacy sub-TLV and IANA is requeste=
d to
379	 =C2=A0 assign the legacy sub-TLV identifer to the corresponding sub-su=
b-TLV.

[minor] Include a forward reference to the IANA Considerations...

[major] "...and IANA is requested to assign the legacy sub-TLV
identifer to the corresponding sub-sub-TLV." (s/identifer/identifier)
Is this assignment something that should also be done going forward
(for new "legacy sub-TLVs"), or just for the initial values in the
registry? =C2=A0 The new registry has a registration policy of "Expert
Review", please include any instructions for the DEs-to-be in the IANA
Considerations section...and maybe a (Normative) pointer to rfcxxx for
completeness.

381	4.2.1. =C2=A0Special Considerations for Maximum Link Bandwidth

383	 =C2=A0 Maximum link bandwidth is an application independent attribute =
of the
384	 =C2=A0 link. =C2=A0When advertised using the Application Specific Link=
 Attributes
385	 =C2=A0 sub-TLV, multiple values for the same link MUST NOT be advertis=
ed.
386	 =C2=A0 This can be accomplished most efficiently by having a single
387	 =C2=A0 advertisement for a given link where the Application Identifier=
 Bit
388	 =C2=A0 Mask identifies all the applications which are making use of th=
e
389	 =C2=A0 value for that link.

[minor] I understand why the "Maximum link bandwidth is an application
independent attribute of the link". =C2=A0But I am having a harder time
understanding why other bandwidth-related metrics (specifically
Unidirectional Residual Bandwidth, Unidirectional Available Bandwidth
and Unidirectional Utilized Bandwidth) are not treated the same way.
A similar question was raised on the list and the treatment was
justified in order to support use cases where the bandwidth is managed
per application [1]. =C2=A0I don't want to revisit the discussion here
about the treatment, but it is important for the reader to understand
the existence of those use cases. =C2=A0Please add a paragraph or two
talking about the consideration.

[1] https://mailarchive.ietf.org/arch/msg/ospf/xl8HWDeQqYNcv_X_568-xv6rfvk

391	 =C2=A0 It is also possible to advertise the same value for a given lin=
k
392	 =C2=A0 multiple times with disjoint sets of applications specified in =
the
393	 =C2=A0 Application Identifier Bit Mask. =C2=A0This is less efficient b=
ut still
394	 =C2=A0 valid.

[minor] This attribute and other bandwidth-related ones are prone to
interaction as multiple applications may want to use the resources.
While the use of the resources is out of scope, it would be helpful to
include that type of information in a Deployment Considerations
section, as mentioned already on the mailing list [1].

[1] https://mailarchive.ietf.org/arch/msg/isis-wg/2M2pho1EZcVTkOOQssLQUVO0H=
Y4

396	 =C2=A0 If different values for Maximum Link Bandwidth for a given link=
 are
397	 =C2=A0 advertised, all values MUST be ignored.

[major] Also an attack vector: for a specific link, a rogue IS can
advertise multiple values, rendering the information unusable for all
applications.

399	4.2.2. =C2=A0Special Considerations for Reservable/Unreserved Bandwidth

401	 =C2=A0 Maximum Reservable Link Bandwidth and Unreserved Bandwidth are
402	 =C2=A0 attributes specific to RSVP. =C2=A0When advertised using the Ap=
plication
403	 =C2=A0 Specific Link Attributes sub-TLV, bits other than the RSVP-TE(R=
-bit)
404	 =C2=A0 MUST NOT be set in the Application Identifier Bit Mask. =C2=A0I=
f an
405	 =C2=A0 advertisement of Maximum Reservable Link Bandwidth or Unreserve=
d
406	 =C2=A0 Bandwidth is received with bits other than the RSVP-TE bit set,=
 the
407	 =C2=A0 advertisement MUST be ignored.

[nit] s/specific to RSVP/specific to RSVP-TE

[nit] s/RSVP-TE(R-bit)/RSVP-TE (R-bit)

[major] It seems to me that "the L-flag MUST be set" is missing above.

409	4.3. =C2=A0Application Specific SRLG TLV

411	 =C2=A0 A new TLV is defined to advertise application specific SRLGs fo=
r a
412	 =C2=A0 given link. =C2=A0Although similar in functionality to TLV 138 =
(defined by
413	 =C2=A0 [RFC5307]) and TLV 139 (defined by [RFC6119], a single TLV prov=
ides
414	 =C2=A0 support for IPv4, IPv6, and unnumbered identifiers for a link.
415	 =C2=A0 Unlike TLVs 138/139, it utilizes sub-TLVs to encode the link
416	 =C2=A0 identifiers in order to provide the flexible formatting require=
d to
417	 =C2=A0 support multiple link identifier types.

[nit] s/TLV 138 (defined by [RFC5307]) and TLV 139 (defined by
[RFC6119],/TLV 138 [RFC5307] and TLV 139 [RFC6119],

419	 =C2=A0 =C2=A0 =C2=A0 Type: 238 (Temporarily assigned by IANA)
420	 =C2=A0 =C2=A0 =C2=A0 Length: Number of octets in the value field (1 oc=
tet)

[major] As with the other sub-TLV, the length is < the potential size
of the Application Identifier Bit Mask...

421	 =C2=A0 =C2=A0 =C2=A0 Value:
422	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Neighbor System-ID + pseudo-node ID (7 oct=
ets)
423	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Application Identifier Bit Mask
424	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(as defined in Section 4.1)
425	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Length of sub-TLVs (1 octet)
426	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Link Identifier sub-TLVs (variable)
427	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0 or more SRLG Values (Each value is 4 oct=
ets)

429	 =C2=A0 =C2=A0 =C2=A0 The following Link Identifier sub-TLVs are define=
d. The type
430	 =C2=A0 =C2=A0 =C2=A0 values are suggested and will be assigned by IANA=
 - but as
431	 =C2=A0 =C2=A0 =C2=A0 the formats are identical to existing sub-TLVs de=
fined for
432	 =C2=A0 =C2=A0 =C2=A0 TLVs 22, 23, 25, 141, 222, and 223 the use of the=
 suggested
433	 =C2=A0 =C2=A0 =C2=A0 sub-TLV types is strongly encouraged.

[major] "The type values are suggested and will be assigned by
IANA..." =C2=A0No. =C2=A0These values are part of a new registry, so this
document can define any value it wants.

[minor] Instead of the text above, include a forward reference to the
IANA Considerations where the whole registry in included.

435	 =C2=A0 =C2=A0 =C2=A0 Type =C2=A0 =C2=A0Description
436	 =C2=A0 =C2=A0 =C2=A0 =C2=A04 =C2=A0 =C2=A0 =C2=A0Link Local/Remote Ide=
ntifiers (see [RFC5307])
437	 =C2=A0 =C2=A0 =C2=A0 =C2=A06 =C2=A0 =C2=A0 =C2=A0IPv4 interface addres=
s (see [RFC5305])
438	 =C2=A0 =C2=A0 =C2=A0 =C2=A08 =C2=A0 =C2=A0 =C2=A0IPv4 neighbor address=
 (see [RFC5305])
439	 =C2=A0 =C2=A0 =C2=A0 12 =C2=A0 =C2=A0 =C2=A0IPv6 Interface Address (se=
e [RFC6119])
440	 =C2=A0 =C2=A0 =C2=A0 13 =C2=A0 =C2=A0 =C2=A0IPv6 Neighbor Address (see=
 [RFC6119])

[nit] s/(see [RFCxxxx])/[RFCxxxx]/g

442	 =C2=A0 At least one set of link identifiers (IPv4, IPv6, or unnumbered=
) MUST
443	 =C2=A0 be present. =C2=A0TLVs which do not meet this requirement MUST =
be ignored.

[major] "one set of link identifiers...MUST be present" =C2=A0Is a set one
of those sub-TLVs or more than one?


...
463	5.1. =C2=A0Use of Legacy Advertisements

[c] I made the same comments in =C2=A78.1 of the OSPF draft.

465	 =C2=A0 Bit Identifers for Standard Applications are defined in Section=
 4.1.
466	 =C2=A0 All of the identifiers defined in this document are associated =
with
467	 =C2=A0 applications which were already deployed in some networks prior=
 to
468	 =C2=A0 the writing of this document. =C2=A0Therefore, such application=
s have been
469	 =C2=A0 deployed using the legacy advertisements. =C2=A0The Standard Ap=
plications
470	 =C2=A0 defined in this document MAY continue to use legacy advertiseme=
nts
471	 =C2=A0 for a given link so long as at least one of the following condi=
tions
472	 =C2=A0 is true:

[nit] s/Identifers/Identifiers

[major] Even if specifying the behavior for the Standard Applications,
this document cannot Normatively specify anything affecting the case
where "applications have been deployed using the legacy
advertisements". =C2=A0s/MAY/may

[] I think that the text in this section can be generalized to any
application, not just ones defined in this document. =C2=A0s/The Standard
Applications defined in this document MAY continue/The Standard
Applications may continue

474	 =C2=A0 o =C2=A0The application is RSVP-TE

476	 =C2=A0 o =C2=A0The application is SRTE or LFA and RSVP-TE is not deplo=
yed
477	 =C2=A0 =C2=A0 =C2=A0anywhere in the network

479	 =C2=A0 o =C2=A0The application is SRTE or LFA, RSVP-TE is deployed in =
the
480	 =C2=A0 =C2=A0 =C2=A0network, and both the set of links on which SRTE a=
nd/or LFA
481	 =C2=A0 =C2=A0 =C2=A0advertisements are required and the attribute valu=
es used by SRTE
482	 =C2=A0 =C2=A0 =C2=A0and/or LFA on all such links is fully congruent wi=
th the links and
483	 =C2=A0 =C2=A0 =C2=A0attribute values used by RSVP-TE

[] To generalize:

=C2=A0 =C2=A0o =C2=A0A single application is deployed in the network

=C2=A0 =C2=A0o =C2=A0Multiple applications are deployed in the network and =
all the links and
=C2=A0 =C2=A0 =C2=A0 attribute values are fully congruent between them.

485	 =C2=A0 Under the conditions defined above, implementations which suppo=
rt the
486	 =C2=A0 extensions defined in this document have the choice of using le=
gacy
487	 =C2=A0 advertisements or application specific advertisements in suppor=
t of
488	 =C2=A0 SRTE and/or LFA. =C2=A0This will require implementations to pro=
vide
489	 =C2=A0 controls specifying which type of advertisements are to be sent=
/
490	 =C2=A0 processed on receive for these applications. =C2=A0Further disc=
ussion of
491	 =C2=A0 the associated issues can be found in Section 7.

[] To generalize: s/in support of SRTE and/or LFA/in support of other
applications

493	 =C2=A0 New applications which future documents define to make use of t=
he
494	 =C2=A0 advertisements defined in this document MUST NOT make use of le=
gacy
495	 =C2=A0 advertisements.

[major] Why not? =C2=A0Just as the cases above, the application may run my
itself on the network, and/or the attributes may be fully congruent.

497	5.2. =C2=A0Use of Zero Length Application Identifier Bit Masks

[minor] This section is partially redundant with the behavior
specified in =C2=A74.1. =C2=A0Please make the specification only once.

499	 =C2=A0 If link attributes are advertised associated with zero length
500	 =C2=A0 Application Identifier Bit Masks for both standard applications=
 and
501	 =C2=A0 user defined applications, then that set of link attributes MAY=
 be
502	 =C2=A0 used by any application. =C2=A0If support for a new application=
 is
503	 =C2=A0 introduced on any node in a network in the presence of such
504	 =C2=A0 advertisements, these advertisements MAY be used by the new
505	 =C2=A0 application. =C2=A0If this is not what is intended, then existi=
ng
506	 =C2=A0 advertisements MUST be readvertised with an explicit set of
507	 =C2=A0 applications specified before a new application is introduced.

[major] s/MAY be used/may be used
It is just a statement of fact...

509	6. =C2=A0Attribute Advertisements and Enablement

[c] This section is pretty much the same in both drafts. =C2=A0Consider
making the specification only once (maybe here =C2=A0-- because the
applications are defined here) and then referencing it. =C2=A0Note the
generalization comment below.


...
520	 =C2=A0 In the case of RSVP-TE, the advertisement of application specif=
ic
521	 =C2=A0 link attributes implies that RSVP is enabled on that link. =C2=
=A0The
522	 =C2=A0 absence of RSVP-TE application specific link attributes in
523	 =C2=A0 combination with the absence of legacy advertisements implies t=
hat
524	 =C2=A0 RSVP is NOT enabled on that link.

[minor] Specifying by implication sounds confusing to me. =C2=A0Can we come
up with Normative language to accompany the text above?

Suggestion>
=C2=A0 =C2=A0The R-bit in the SABM MUST be set only if RSVP is enabled on t=
he
=C2=A0 =C2=A0corresponding link. =C2=A0All RSVP-enabled links MUST have a c=
orresponding link
=C2=A0 =C2=A0attributes advertisement.

526	 =C2=A0 In the case of SRTE, advertisement of application specific link
527	 =C2=A0 attributes does NOT indicate enablement of SRTE. =C2=A0The adve=
rtisements
528	 =C2=A0 are only used to support constraints which may be applied when
529	 =C2=A0 specifying an explicit path. =C2=A0SRTE is implicitly enabled o=
n all links
530	 =C2=A0 which are part of the Segment Routing enabled topology independ=
ent of
531	 =C2=A0 the existence of link attribute advertisements

533	 =C2=A0 In the case of LFA, advertisement of application specific link
534	 =C2=A0 attributes does NOT indicate enablement of LFA on that link.
535	 =C2=A0 Enablement is controlled by local configuration.

537	 =C2=A0 If, in the future, additional standard applications are defined=
 to
538	 =C2=A0 use this mechanism, the specification defining this use MUST de=
fine
539	 =C2=A0 the relationship between application specific link attribute
540	 =C2=A0 advertisements and enablement for that application.

[] To generalize:

Suggestion>
=C2=A0 =C2=A0For Standard Applications, advertisement of application specif=
ic link
=C2=A0 =C2=A0attributes does NOT indicate enablement of the application on =
that link. =C2=A0If
=C2=A0 =C2=A0additional Standard Applications are defined with a different =
enablement
=C2=A0 =C2=A0expectation, then the corresponding specification MUST define =
the alternate
=C2=A0 =C2=A0relationship between application specific link attribute adver=
tisements and
=C2=A0 =C2=A0enablement for that application.

542	 =C2=A0 This document allows the advertisement of application specific =
link
543	 =C2=A0 attributes with no application identifiers i.e., both the Stand=
ard
544	 =C2=A0 Application Identifier Bit Mask and the User Defined Applicatio=
n
545	 =C2=A0 Identifier Bit Mask are not present (See Section 4.1). =C2=A0Th=
is supports
546	 =C2=A0 the use of the link attribute by any application. =C2=A0In the =
presence of
547	 =C2=A0 an application where the advertisement of link attribute
548	 =C2=A0 advertisements is used to infer the enablement of an applicatio=
n on
549	 =C2=A0 that link (e.g., RSVP-TE), the absence of the application ident=
ifier
550	 =C2=A0 leaves ambiguous whether that application is enabled on such a =
link.
551	 =C2=A0 This needs to be considered when making use of the "any applica=
tion"
552	 =C2=A0 encoding.

[major] What does the use of the "any application" encoding say about
RSVP-TE? =C2=A0My interpretation is that if RSVP-TE is used, then the "any
application" encoding can't be used. =C2=A0Is that correct? =C2=A0Please be
specific.


...
572	7.1. =C2=A0Multiple Applications: Common Attributes with RSVP-TE

574	 =C2=A0 In cases where multiple applications are utilizing a given link=
, one
575	 =C2=A0 of the applications is RSVP-TE, and all link attributes for a g=
iven
576	 =C2=A0 link are common to the set of applications utilizing that link,
577	 =C2=A0 interoperability is achieved by using legacy advertisements and
578	 =C2=A0 sending application specific advertisements with L-bit set and =
no
579	 =C2=A0 link attribute values. =C2=A0This avoids duplication of link at=
tribute
580	 =C2=A0 advertisements.

[nit] s/L-bit/L-flag/g

[nit] s/with L-bit set/with the L-flag set

582	7.2. =C2=A0Multiple Applications: All Attributes Not Shared w RSVP-TE

[nit] s/w/with

584	 =C2=A0 In cases where one or more applications other than RSVP-TE are
585	 =C2=A0 utilizing a given link and one or more link attribute values ar=
e NOT
586	 =C2=A0 shared with RSVP-TE, it is necessary to use application specifi=
c
587	 =C2=A0 advertisements as defined in this document. =C2=A0Attributes fo=
r
588	 =C2=A0 applications other than RSVP-TE MUST be advertised using applic=
ation
589	 =C2=A0 specific advertisements which have the L-bit clear. =C2=A0In ca=
ses where
590	 =C2=A0 some link attributes are shared with RSVP-TE, this requires dup=
licate
591	 =C2=A0 advertisements for those attributes.

[major] "Attributes for applications other than RSVP-TE MUST be
advertised using application specific advertisements..." =C2=A0=C2=A77 sets=
 up
the section mentioning the need "to co-exist with use of the legacy
advertisements by routers which do not support the extensions defined
in this document." =C2=A0In this case, the routers which support the
extensions will have a different view compared to the routers which
don't. =C2=A0This can result in sub-optimal routing, loops, etc.. =C2=A0It =
is
obviously not a backwards compatible deployment. =C2=A0How can that be
addressed/mitigated?


...
598	7.3. =C2=A0Use of Application Specific Advertisements for RSVP-TE
...
605	 =C2=A0 1)Upgrade all routers to support extensions in this document

[nit] s/support extensions/support the extensions

607	 =C2=A0 2)Readvertise all legacy link attributes using application spec=
ific
608	 =C2=A0 advertisements with L-bit clear and R-bit set.

[minor] s/Readvertise/Advertise

610	 =C2=A0 3)Remove legacy advertisements

612	 =C2=A0 Migrating RSVP-TE away from legacy advertisements could result =
in
613	 =C2=A0 some implementation simplification as it allows the removal of =
code
614	 =C2=A0 which encodes/decodes the legacy advertisements. =C2=A0Whether =
this is
615	 =C2=A0 seen as desirable is something for the marketplace to determine=
.

[?] "allows the removal of code which encodes/decodes the legacy
advertisements" =C2=A0If the sub-sub-TLVs used are the same as the legacy
ones, wouldn't the code be pretty much the same?? =C2=A0Either way,
considerations which may be implementation-dependent seems out of
place is a section talking about deployment.

617	8. =C2=A0IANA Considerations

[minor] For clarity, consider using sub-sections below.

619	 =C2=A0 This document defines a new sub-TLV for TLVs 22, 23, 25, 141, 2=
22,
620	 =C2=A0 and 223.

[major] Please explicitly include the name of the registry.

622	 =C2=A0 =C2=A0Type =C2=A0Description =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 22 =C2=A0 23 =C2=A0 25 =C2=A0141 =C2=A0222 =C2=A0223
623	 =C2=A0 =C2=A0---- =C2=A0--------------------- =C2=A0---- ---- ---- ---=
- ---- ----
624	 =C2=A0 =C2=A0 16 =C2=A0 Application Specific =C2=A0 =C2=A0 y =C2=A0 =
=C2=A0y =C2=A0y(s) =C2=A0 y =C2=A0 =C2=A0y =C2=A0 =C2=A0y
625	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Link Attributes

627	 =C2=A0 This document defines one new TLV:

[major] Explicitly mention the name of the registry.

629	 =C2=A0 =C2=A0Type =C2=A0Description =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 IIH LSP SNP Purge
630	 =C2=A0 =C2=A0---- =C2=A0--------------------- =C2=A0 --- --- --- -----
631	 =C2=A0 =C2=A0 238 =C2=A0Application Specific =C2=A0 =C2=A0 n =C2=A0 y =
=C2=A0 n =C2=A0 =C2=A0n
632	 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRLG

634	 =C2=A0 This document requests a new IANA registry be created to contro=
l the
635	 =C2=A0 assignment of sub-sub-TLV codepoints for the Application Specif=
ic
636	 =C2=A0 Link Attributes sub-TLV. =C2=A0The suggested name of the new re=
gistry is
637	 =C2=A0 "sub-sub-TLV code points for application specific link attribut=
es".
638	 =C2=A0 The registration procedure is "Expert Review" as defined in
639	 =C2=A0 [RFC8126]. =C2=A0The following assignments are made by this doc=
ument:

[major] Explicitly indicate where the new sub-registries should be
created. =C2=A0In this case in the "IS-IS TLV Codepoints" registry.

[minor] Adding a reference to rfc7370 would be useful. =C2=A0Make it Normat=
ive.

[major] If the legacy specifications are extended, is it expected that
new sub-sub-TLVs will also be created? =C2=A0If so, there need to be
explicit instructions to the DEs in the legacy registries.


...
663	 =C2=A0 This document requests a new IANA registry be created, under th=
e
664	 =C2=A0 category of "Interior Gateway Protocol (IGP) Parameters", to co=
ntrol
665	 =C2=A0 the assignment of Application Identifier Bits. =C2=A0The sugges=
ted name of
666	 =C2=A0 the new registry is "Link Attribute Applications". =C2=A0The re=
gistration
667	 =C2=A0 policy for this registry is "Standards Action" ([RFC8126] and
668	 =C2=A0 [RFC7120]). =C2=A0The following assignments are made by this do=
cument:

[minor] If we're setting up a applications, why not make it generic:
"IGP Applications", for example...??

[minor] s/"Standards Action" ([RFC8126] and [RFC7120])./"Standards
Action" [RFC8126]. =C2=A0 =C2=A0 Standards Action is only defined in rfc812=
6;
the reference to rfc7120 is not needed.

670	 =C2=A0 =C2=A0Bit # =C2=A0 Name
671	 =C2=A0 ---------------------------------------------------------
672	 =C2=A0 =C2=A0 0 =C2=A0 =C2=A0 =C2=A0RSVP-TE (R-bit)
673	 =C2=A0 =C2=A0 1 =C2=A0 =C2=A0 =C2=A0Segment Routing Traffic Engineerin=
g (S-bit)
674	 =C2=A0 =C2=A0 2 =C2=A0 =C2=A0 =C2=A0Loop Free Alternate (F-bit)

[major] =C2=A0Add a line to cover the rest of the range and call it "Unassi=
gned".

676	 =C2=A0 This document requests a new IANA registry be created to contro=
l the
677	 =C2=A0 assignment of sub-TLV types for the application specific SRLG T=
LV.
678	 =C2=A0 The suggested name of the new registry is "Sub-TLVs for TLV 238=
".
679	 =C2=A0 The registration procedure is "Expert Review" as defined in
680	 =C2=A0 [RFC8126]. =C2=A0The following assignments are made by this doc=
ument:

[major] Indicate where this registry should be created.

[minor] Adding a reference to rfc7370 would be useful. Make it Normative.

682	 =C2=A0 =C2=A0Value =C2=A0 =C2=A0Description
683	 =C2=A0 =C2=A0---------------------------------------------------------
684	 =C2=A0 =C2=A0 0-3 =C2=A0 =C2=A0 Unassigned
685	 =C2=A0 =C2=A0 =C2=A04 =C2=A0 =C2=A0 =C2=A0Link Local/Remote Identifier=
s (see [RFC5307])
686	 =C2=A0 =C2=A0 =C2=A05 =C2=A0 =C2=A0 =C2=A0Unassigned
687	 =C2=A0 =C2=A0 =C2=A06 =C2=A0 =C2=A0 =C2=A0IPv4 interface address (see =
[RFC5305])
688	 =C2=A0 =C2=A0 =C2=A07 =C2=A0 =C2=A0 =C2=A0Unassigned
689	 =C2=A0 =C2=A0 =C2=A08 =C2=A0 =C2=A0 =C2=A0IPv4 neighbor address (see [=
RFC5305])
690	 =C2=A0 =C2=A0 9-11 =C2=A0 =C2=A0Unassigned
691	 =C2=A0 =C2=A0 12 =C2=A0 =C2=A0 =C2=A0IPv6 Interface Address (see [RFC6=
119])
692	 =C2=A0 =C2=A0 13 =C2=A0 =C2=A0 =C2=A0IPv6 Neighbor Address (see [RFC61=
19])
693	 =C2=A0 =C2=A014-255 =C2=A0 Unassigned

[major] Do you want the reference to the assignments to be this
document, the RFC where the encoding is defined, or both? =C2=A0I would
suggest this document. =C2=A0Please add a column to reflect that: e.g.,
"[RFC5307] [This Document]"...and take out the "(see ...)" text.

695	9. =C2=A0Security Considerations

697	 =C2=A0 Security concerns for IS-IS are addressed in [ISO10589, [RFC530=
4],
698	 =C2=A0 and [RFC5310].

[major] ISO10589 is not in the References section. =C2=A0It should be a
Normative reference.

[major] rfc5304/rfc5310 only talk about authentication. =C2=A0What about
vulnerabilities specifically introduced by the new functionality?
This document doesn't define new TE-related attributes, just a new way
to advertise them...perhaps include something like this:

=C2=A0 =C2=A0This document defines a new way to advertise already defined T=
E Attributes.
=C2=A0 =C2=A0As these TLVs are not used for SPF computation or normal routi=
ng, the
=C2=A0 =C2=A0extensions specified here have no direct effect on IP routing.=
 =C2=A0Tampering
=C2=A0 =C2=A0with the information defined in this document may have an effe=
ct on
=C2=A0 =C2=A0applications using it, including potential sub-optimal Traffic=
 Engineering.
=C2=A0 =C2=A0This is not new...see [RFC5305], [RFC5307], [RFC6119], and [RF=
C8570].

And then there are possible vulnerabilities introduced by this
document. =C2=A0I put some comments above about the ability of a rogue
router to render the data unusable by setting, for example the L-flag,
or sending conflicting values. =C2=A0At best, this action could result in
sub-optimal paths (by taking some links out of consideration)...
Consider adding text related to that.


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From: Alvaro Retana <aretana.ietf@gmail.com>
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Subject: Re: [Lsr] [Technical Errata Reported] RFC2328 (5956)
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On January 9, 2020 at 11:13:26 AM, Acee Lindem wrote:

[Trimming the distribution list.]

Hi!

I agree with Acee, but for different reasons.

> I don't agree this change is required. The non-normative appendix C text
> clearly states that this is the "cost of sending a packet on the interfac=
e".
> The examples cited are cases where reachability to a local address is
> provided. Now, there are cases where it is useful to specify a non-zero c=
ost
> for a loopback address (e.g., Anycast addresses) but these scenarios are =
out
> of scope.


I always thought that the Appendices were normative...among other
things because of how they are referenced in the text, they define the
LSA formats, etc. =C2=A0 But =C2=A79 (The Interface Data Structure) contain=
s the
same text anyway:

=C2=A0 =C2=A0Interface output cost(s)
=C2=A0 =C2=A0 =C2=A0 =C2=A0The cost of sending a data packet on the interfa=
ce, expressed in
=C2=A0 =C2=A0 =C2=A0 =C2=A0the link state metric. =C2=A0This is advertised =
as the link cost for
=C2=A0 =C2=A0 =C2=A0 =C2=A0this interface in the router-LSA. The cost of an=
 interface must
=C2=A0 =C2=A0 =C2=A0 =C2=A0be greater than zero.



Acee is right in pointing out that the text above doesn't apply
because "reachability to a local address is provided"; in fact, both
the examples mentioned say that the information is "indicating a host
route"...

=C2=A712.4.1 (Router-LSAs):

=C2=A0 =C2=A0A host route is represented as a Type 3 link (stub network)
=C2=A0 =C2=A0whose Link ID is the host's IP address, Link Data is the mask
=C2=A0 =C2=A0of all ones (0xffffffff), and cost the host's configured cost
=C2=A0 =C2=A0(see Section C.7).

...and from =C2=A7C.7 (Host route parameters):

=C2=A0 =C2=A0Cost of link to host
=C2=A0 =C2=A0 =C2=A0 =C2=A0The cost of sending a packet to the host, in ter=
ms of the
=C2=A0 =C2=A0 =C2=A0 =C2=A0link state metric. =C2=A0However, since the host=
 probably has
=C2=A0 =C2=A0 =C2=A0 =C2=A0only a single connection to the internet, the ac=
tual
=C2=A0 =C2=A0 =C2=A0 =C2=A0configured cost in many cases is unimportant (i.=
e., will
=C2=A0 =C2=A0 =C2=A0 =C2=A0have no effect on routing).


The specification says that for a host route the cost doesn't matter,
so the fact that the examples indicate "cost set to 0" is not in
conflict.

Alvaro.


> =EF=BB=BFOn 1/8/20, 4:58 PM, "RFC Errata System" wrote:
>
> The following errata report has been submitted for RFC2328,
> "OSPF Version 2".
>
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid5956
>
> --------------------------------------
> Type: Technical
> Reported by: Marcelo Bustani
>
> Section: 12.4.1
>
> Original Text
> -------------
> Router-LSAs
>
> If the state of the interface is Loopback, add a Type 3
> link (stub network) as long as this is not an interface
> to an unnumbered point-to-point network. The Link ID
> should be set to the IP interface address, the Link Data
> set to the mask 0xffffffff (indicating a host route),
> and the cost set to 0.
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 12.4.1.4. Describing Point-to-MultiPoint interfaces
>
> For operational Point-to-MultiPoint interfaces, one or
> more link descriptions are added to the router-LSA as
> follows:
>
> o A single Type 3 link (stub network) is added with
> Link ID set to the router's own IP interface
> address, Link Data set to the mask 0xffffffff
> (indicating a host route), and cost set to 0.
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
> C.3 Router interface parameters
>
> Interface output cost
> The cost of sending a packet on the interface, expressed in
> the link state metric. This is advertised as the link cost
> for this interface in the router's router-LSA. The interface
> output cost must always be greater than 0.
>
>
> Corrected Text
> --------------
> "cost set to 0" to at least "greater than 0"
>
> Notes
> -----
> The section 12.4.1 and 12.4.1.4 are inconsistent with the appendix c.3.
>
> These both section we find the cost to stub networks have to be set to 0,=
 but
> in appendix c.3 we see that the interfaces must have greater than 0.
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if necessary.
>
> --------------------------------------
> RFC2328 (no draft string recorded)
> --------------------------------------
> Title : OSPF Version 2
> Publication Date : April 1998
> Author(s) : J. Moy
> Category : INTERNET STANDARD
> Source : Open Shortest Path First IGP
> Area : Routing
> Stream : IETF
> Verifying Party : IESG


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To: Marcelo Bustani <mbustani@gmail.com>
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Subject: Re: [Lsr] [Technical Errata Reported] RFC2328 (5956)
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On January 9, 2020 at 3:51:51 PM, Marcelo Bustani wrote:

[Trimming the distribution.]

Marcelo:

Hi!

> I believe this is interesting to make this consistent, because I`m facing
> different usage for this situation. For example, Cisco uses cost 1 for th=
is
> type of interface and Juniper cost 0.
> I think that RFC as a document of standardization must be followed by all=
,
> mainly for an open protocol as OSPF.


We're all in agreement about the purpose of the RFC. :-)

As far as the Errata Report, no change to the RFC is needed. =C2=A0Unless
anyone on the list disagrees, I am them going to mark the report as
Rejected.

You should be able to point the vendors to the RFC text and this discussion=
.

Best regards,

Alvaro.


From nobody Thu Jan  9 18:13:17 2020
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Subject: [Lsr] I-D Action: draft-ietf-isis-sr-yang-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : YANG Data Model for IS-IS Segment Routing
        Authors         : Stephane Litkowski
                          Yinghzen Qu
                          Pushpasis Sarkar
                          Ing-Wher Chen
                          Jeff Tantsura
	Filename        : draft-ietf-isis-sr-yang-07.txt
	Pages           : 25
	Date            : 2020-01-09

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage IS-IS Segment Routing.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-sr-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-sr-yang-07
https://datatracker.ietf.org/doc/html/draft-ietf-isis-sr-yang-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-sr-yang-07


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Thu Jan  9 18:22:21 2020
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Hi, Les, Robert and other experts within LSR:

=20

We have submitted the draft that related to the passive interface =
attribute, please review it at  =
https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00=


=20

If you are interested, we are also welcome you as the co-author to put =
forward it together.

Any comments are welcome.

=20

Thanks in advance.

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Aijun Wang
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=887=E6=97=A5 =
18:57
=E6=94=B6=E4=BB=B6=E4=BA=BA: Robert Raszuk
=E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces =
within ISIS

=20

Hi, Robert:

There are situations that we want to distinguish the passive interfaces =
from the normal interfaces. I will try to write one draft in recent days =
to describe it and for further discussion.

=20

Thanks in advance.

Aijun Wang

China Telecom





On Jan 7, 2020, at 18:14, Robert Raszuk <robert@raszuk.net> wrote:

=EF=BB=BF

Hi Aijun,

=20

Right .. I took your email as an attempt/request to actually advertise =
passive links in the first place.=20

=20

May we know what difference does it make to you if reachable prefix is =
part of an active vs passive interface from IGP point of view ?=20

=20

Thx,

R.

=20

=20

On Tue, Jan 7, 2020 at 2:08 AM Aijun Wang <wangaijun@tsinghua.org..cn =
<mailto:wangaijun@tsinghua.org.cn> > wrote:

Hi, Robert:

=20

Thanks for your information.

TLV-22 is used to describe the IS neighbor and the link between them. As =
for the passive interfaces, there may be no neighbor.=20

It seems the sub-TLV within this TLV is not the appropriate place to put =
this information?

=20

P.S. I changed the thread to reflect the conversion topic.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 =
18:58
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to =
expand the IS-IS level to 8?

=20

Aijun,

=20

We just want to distinguish the passive interfaces from other normal =
interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute =
Flags=E2=80=9D that described in =
https://tools.ietf.org/html/rfc7794#section-2.1 is the most appropriate =
place to extend to carry such information.

=20

Really ?

=20

IMO much better place is to define new sub-TLV of TLV-22 and mark it =
there as passive link.

=20

Ref: https://tools..ietf.org/html/rfc5029 =
<https://tools.ietf.org/html/rfc5029>=20

=20

Now more interesting perhaps is to find out how ISIS is supposed to =
react to such information. Or is the intention to carry it just as an =
opaque info say for show commands use only ?=20

=20

Thx,
R.

=20

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Any comments are welcome.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks in advance.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt'>Aijun Wang<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>7</span>=E6=97=A5<span =
lang=3DEN-US> 18:57<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Robert =
Raszuk<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Les Ginsberg (ginsberg); =
lsr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Methods to label =
the passive interfaces within =
ISIS<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Hi, Robert:<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US>There are situations that we want =
to distinguish the passive interfaces from the normal interfaces. I will =
try to write one draft in recent days to describe it and for further =
discussion.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US>Thanks in =
advance.<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US>China =
Telecom<o:p></o:p></span></p></div></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><br><br><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US>On Jan 7, 2020, at =
18:14, Robert Raszuk &lt;<a =
href=3D"mailto:robert@raszuk.net">robert@raszuk.net</a>&gt; =
wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>=EF=BB=BF<o:p></o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Hi =
Aijun,<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p =
class=3DMsoNormal><span lang=3DEN-US>Right .. I took your&nbsp;email as =
an attempt/request&nbsp;to actually advertise passive links in the first =
place.&nbsp;<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>May we know what difference does it =
make to you if reachable prefix is part of an active vs passive =
interface from IGP point of&nbsp;view =
?&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Thx,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>R.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>On Tue, Jan 7, 2020 at 2:08 AM =
Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org..cn</a>&=
gt; wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Robert:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for =
your information.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>TLV-22 is used to describe the IS neighbor and the link between them. =
As for the passive interfaces, there may be no neighbor. </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>It seems the sub-TLV within this TLV is not the appropriate place to =
put this information?</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>P.S. I changed the thread to reflect the conversion =
topic.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:ju=
stify;text-justify:inter-ideograph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:ju=
stify;text-justify:inter-ideograph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:ju=
stify;text-justify:inter-ideograph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:ju=
stify;text-justify:inter-ideograph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> <a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a> [mailto:<a =
href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>] </span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt'>Robert Raszuk<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>6</span>=E6=97=A5<span =
lang=3DEN-US> 18:58<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@ietf.org" =
target=3D"_blank">lsr@ietf.org</a><br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: Is it necessary to expand =
the IS-IS level to 8?</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><div><div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Aijun,<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5=
.0pt'><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US style=3D'color:#1F497D'>We just want to distinguish the =
passive interfaces from other normal interfaces within ISIS =
domain.&nbsp; It seems that the =E2=80=9CAttribute Flags=E2=80=9D that =
described in </span><span lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" =
target=3D"_blank">https://tools.ietf.org/html/rfc7794#section-2.1</a><spa=
n style=3D'color:#1F497D'> is the most appropriate place to extend to =
carry such =
information.</span><o:p></o:p></span></p></div></blockquote><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Really ?<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>IMO much better place is to define new sub-TLV of TLV-22 =
and mark it there as passive link.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Ref:&nbsp;<a href=3D"https://tools.ietf.org/html/rfc5029" =
target=3D"_blank">https://tools..ietf.org/html/rfc5029</a><o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Now more interesting perhaps is to find out how ISIS is =
supposed to react to such information. Or is the intention to carry it =
just as an opaque info say for show commands use only =
?&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>Thx,<br>R.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div></div></div></div></=
blockquote></div><p class=3DMsoNormal><span =
lang=3DEN-US>_______________________________________________<br>Lsr =
mailing list<br><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/m=
ailman/listinfo/lsr</a><o:p></o:p></span></p></div></blockquote></div></d=
iv></body></html>
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From: Marcelo Bustani <mbustani@gmail.com>
Date: Thu, 9 Jan 2020 21:53:03 -0300
Message-ID: <CAFhcoXyKYuMDHVLLntOekwh=2LjwsAKFwoKvhZCkoG0LFPjcVA@mail.gmail.com>
To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: mbustani@att.com, "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] [Technical Errata Reported] RFC2328 (5956)
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Hi Retana,

I appreciate your time and of all involved, but it is very inadmissible we
have a document used as a reference that is not used appropriately, or by
misunderstanding or by convenience.

I will internally advertise AT&T and IBM, because we work together with
both Cisco and Juniper equipment, and by the way with OSPF
interoperability. Beyond this tinny found, we can have another one that can
bring a big problem. This one, sincerely, I don't know what kind of issue
can bring, but at least I already know and it will save our time of
troubleshooting or delivering. My intention was to mitigate a possible
misunderstanding or a multiple different interpretations, that I guess it
is happening with Cisco and Juniper; both are not wrong depending from the
section they are based on.

So, I will try, following your recommendation, also to contact Cisco and
Juniper to make this all clear. As I said, my concern is that we have more
inconsistency between vendors and about something bigger.

Thank you guys!!
Happy 2020.

Em qui., 9 de jan. de 2020 =C3=A0s 20:11, Alvaro Retana <aretana.ietf@gmail=
.com>
escreveu:

> On January 9, 2020 at 3:51:51 PM, Marcelo Bustani wrote:
>
> [Trimming the distribution.]
>
> Marcelo:
>
> Hi!
>
> > I believe this is interesting to make this consistent, because I`m faci=
ng
> > different usage for this situation. For example, Cisco uses cost 1 for
> this
> > type of interface and Juniper cost 0.
> > I think that RFC as a document of standardization must be followed by
> all,
> > mainly for an open protocol as OSPF.
>
>
> We're all in agreement about the purpose of the RFC. :-)
>
> As far as the Errata Report, no change to the RFC is needed.  Unless
> anyone on the list disagrees, I am them going to mark the report as
> Rejected.
>
> You should be able to point the vendors to the RFC text and this
> discussion.
>
> Best regards,
>
> Alvaro.
>

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<div dir=3D"ltr"><div>Hi Retana,</div><div><br></div><div>I appreciate your=
 time and of all involved, but it is very inadmissible we have a document u=
sed as a reference that is not used appropriately, or by misunderstanding o=
r by convenience.</div><div><br></div><div>I will internally advertise AT&a=
mp;T and IBM, because we work together with both Cisco and Juniper equipmen=
t, and by the way with OSPF interoperability. Beyond this tinny found, we c=
an have another one that can bring a big problem. This one, sincerely, I do=
n&#39;t know what kind of issue can bring, but at least I already know and =
it will save our time of troubleshooting or delivering. My intention was to=
 mitigate a possible misunderstanding or a multiple different interpretatio=
ns, that I guess it is happening with Cisco and Juniper; both are not wrong=
 depending from the section they are based on.</div><div><br></div><div>So,=
 I will try, following your recommendation, also to contact Cisco and Junip=
er to make this all clear. As I said, my concern is that we have more incon=
sistency between vendors and about something bigger.=C2=A0 <br></div><div><=
br></div><div>Thank you guys!!</div><div>Happy 2020.=C2=A0 <br></div></div>=
<br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">Em qui=
., 9 de jan. de 2020 =C3=A0s 20:11, Alvaro Retana &lt;<a href=3D"mailto:are=
tana.ietf@gmail.com">aretana.ietf@gmail.com</a>&gt; escreveu:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">On January 9, 2020 at 3:51:51=
 PM, Marcelo Bustani wrote:<br>
<br>
[Trimming the distribution.]<br>
<br>
Marcelo:<br>
<br>
Hi!<br>
<br>
&gt; I believe this is interesting to make this consistent, because I`m fac=
ing<br>
&gt; different usage for this situation. For example, Cisco uses cost 1 for=
 this<br>
&gt; type of interface and Juniper cost 0.<br>
&gt; I think that RFC as a document of standardization must be followed by =
all,<br>
&gt; mainly for an open protocol as OSPF.<br>
<br>
<br>
We&#39;re all in agreement about the purpose of the RFC. :-)<br>
<br>
As far as the Errata Report, no change to the RFC is needed.=C2=A0 Unless<b=
r>
anyone on the list disagrees, I am them going to mark the report as<br>
Rejected.<br>
<br>
You should be able to point the vendors to the RFC text and this discussion=
.<br>
<br>
Best regards,<br>
<br>
Alvaro.<br>
</blockquote></div>

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Sender: Tony Li <tony1athome@gmail.com>
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Aijun,

Thank you for your draft.

First off, a =E2=80=98passive interface=E2=80=99 is a particular user =
interface phrase used by one very particular vendor.  It=E2=80=99s not a =
particularly accurate description, either. For example, a =E2=80=98passive=
=E2=80=99 interface implies that it might
accept protocol packets, but would not be active and send things on that =
interface.  That might have been meaningful in the distance vector days, =
but we=E2=80=99re decades past that now. The =E2=80=99stub link=E2=80=99 =
designation=20
sounds more accurate.

But that=E2=80=99s just naming.

As to mechanism, it seems to me that we already have the mechanisms that =
you want. Specifically, RFC 5029 already gives us a way of capturing =
link attributes. It would seem to me that all you need is a code point =
from that registry and you=E2=80=99d be done.  I=E2=80=99d recommend you =
direct your draft in that direction.

Regards,
Tony




> On Jan 9, 2020, at 6:22 PM, Aijun Wang <wangaijun@tsinghua.org.cn> =
wrote:
>=20
> Hi, Les, Robert and other experts within LSR:
> =20
> We have submitted the draft that related to the passive interface =
attribute, please review it at  =
https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00 =
<https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00=
>
> =20
> If you are interested, we are also welcome you as the co-author to put =
forward it together.
> Any comments are welcome.
> =20
> Thanks in advance.
> =20
> =20
> Best Regards.
> =20
> Aijun Wang
> China Telecom
> =20
> =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Aijun Wang
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=887=E6=97=A5 =
18:57
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Robert Raszuk
> =E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
> =E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces =
within ISIS
> =20
> Hi, Robert:
> There are situations that we want to distinguish the passive =
interfaces from the normal interfaces. I will try to write one draft in =
recent days to describe it and for further discussion.
> =20
> Thanks in advance.
>=20
> Aijun Wang
> China Telecom
>=20
>=20
> On Jan 7, 2020, at 18:14, Robert Raszuk <robert@raszuk.net =
<mailto:robert@raszuk.net>> wrote:
>=20
>> =EF=BB=BF
>> Hi Aijun,
>> =20
>> Right .. I took your email as an attempt/request to actually =
advertise passive links in the first place.=20
>> =20
>> May we know what difference does it make to you if reachable prefix =
is part of an active vs passive interface from IGP point of view ?=20
>> =20
>> Thx,
>> R.
>> =20
>> =20
>> On Tue, Jan 7, 2020 at 2:08 AM Aijun Wang <wangaijun@tsinghua.org..cn =
<mailto:wangaijun@tsinghua.org.cn>> wrote:
>>> Hi, Robert:
>>> =20
>>> Thanks for your information.
>>> TLV-22 is used to describe the IS neighbor and the link between =
them. As for the passive interfaces, there may be no neighbor.=20
>>> It seems the sub-TLV within this TLV is not the appropriate place to =
put this information?
>>> =20
>>> P.S. I changed the thread to reflect the conversion topic.
>>> =20
>>> Best Regards.
>>> =20
>>> Aijun Wang
>>> China Telecom
>>> =20
>>> =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
<mailto:lsr-bounces@ietf.org> [mailto:lsr-bounces@ietf.org =
<mailto:lsr-bounces@ietf.org>] =E4=BB=A3=E8=A1=A8 Robert Raszuk
>>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5=
 18:58
>>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
>>> =E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org =
<mailto:lsr@ietf.org>
>>> =E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to =
expand the IS-IS level to 8?
>>> =20
>>> Aijun,
>>> =20
>>>> We just want to distinguish the passive interfaces from other =
normal interfaces within ISIS domain.  It seems that the =E2=80=9CAttribut=
e Flags=E2=80=9D that described in =
https://tools.ietf.org/html/rfc7794#section-2.1 =
<https://tools.ietf.org/html/rfc7794#section-2.1> is the most =
appropriate place to extend to carry such information.
>>> =20
>>> Really ?
>>> =20
>>> IMO much better place is to define new sub-TLV of TLV-22 and mark it =
there as passive link.
>>> =20
>>> Ref: https://tools..ietf.org/html/rfc5029 =
<https://tools.ietf.org/html/rfc5029>
>>> =20
>>> Now more interesting perhaps is to find out how ISIS is supposed to =
react to such information. Or is the intention to carry it just as an =
opaque info say for show commands use only ?=20
>>> =20
>>> Thx,
>>> R.
>>> =20
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org <mailto:Lsr@ietf.org>
>> https://www.ietf.org/mailman/listinfo/lsr =
<https://www.ietf.org/mailman/listinfo/lsr>_______________________________=
________________
> Lsr mailing list
> Lsr@ietf.org
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><br class=3D""></div>Hi Aijun,<div class=3D""><br =
class=3D""></div><div class=3D"">Thank you for your draft.</div><div =
class=3D""><br class=3D""></div><div class=3D"">First off, a =E2=80=98pass=
ive interface=E2=80=99 is a particular user interface phrase used by one =
very particular vendor. &nbsp;It=E2=80=99s not a particularly accurate =
description, either. For example, a =E2=80=98passive=E2=80=99 interface =
implies that it might</div><div class=3D"">accept protocol packets, but =
would not be active and send things on that interface. &nbsp;That might =
have been meaningful in the distance vector days, but we=E2=80=99re =
decades past that now. The =E2=80=99stub link=E2=80=99 =
designation&nbsp;</div><div class=3D"">sounds more accurate.</div><div =
class=3D""><br class=3D""></div><div class=3D"">But that=E2=80=99s just =
naming.</div><div class=3D""><br class=3D""></div><div class=3D"">As to =
mechanism, it seems to me that we already have the mechanisms that you =
want. Specifically, RFC 5029 already gives us a way of capturing link =
attributes. It would seem to me that all you need is a code point from =
that registry and you=E2=80=99d be done. &nbsp;I=E2=80=99d recommend you =
direct your draft in that direction.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div><div =
class=3D"">Tony</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jan 9, 2020, at 6:22 PM, Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn" =
class=3D"">wangaijun@tsinghua.org.cn</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi, Les, Robert and =
other experts within LSR:<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">We have =
submitted the draft that related to the passive interface attribute, =
please review it at &nbsp;</span><span lang=3D"EN-US" class=3D""><a =
href=3D"https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attri=
bute-00" style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/draft-wang-lsr-passive-interface-at=
tribute-00</a><o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">If you are =
interested, we are also welcome you as the co-author to put forward it =
together.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Any comments =
are welcome.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanks in =
advance.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93; text-align: =
justify;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Best Regards.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=
=E4=BD=93; text-align: justify;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93; text-align: =
justify;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Aijun Wang<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=
=E4=BD=93; text-align: justify;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">China Telecom</span><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><b class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3D"EN-US" class=3D"">:</span></span></b><span lang=3D"EN-US" =
style=3D"font-size: 10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-bounces@ietf.org" class=3D"">lsr-bounces@ietf.org</a> =
[<a href=3D"mailto:lsr-bounces@ietf.org" =
class=3D"">mailto:lsr-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span></span><b class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">=E4=BB=A3=E8=A1=A8<span =
class=3D"Apple-converted-space">&nbsp;</span></span></b><span =
lang=3D"EN-US" style=3D"font-size: 10pt;" class=3D"">Aijun Wang<br =
class=3D""></span><b class=3D""><span style=3D"font-size: 10pt;" =
class=3D"">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3D"EN-US" =
class=3D"">:</span></span></b><span lang=3D"EN-US" style=3D"font-size: =
10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>2020</span><span =
style=3D"font-size: 10pt;" class=3D"">=E5=B9=B4<span lang=3D"EN-US" =
class=3D"">1</span>=E6=9C=88<span lang=3D"EN-US" =
class=3D"">7</span>=E6=97=A5<span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>18:57<br class=3D""></span><b=
 class=3D"">=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Robert Raszuk<br =
class=3D""></span><b class=3D"">=E6=8A=84=E9=80=81<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Les Ginsberg (ginsberg); <a =
href=3D"mailto:lsr@ietf.org" class=3D"">lsr@ietf.org</a><br =
class=3D""></span><b class=3D"">=E4=B8=BB=E9=A2=98<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Lsr] Methods to label =
the passive interfaces within ISIS<o:p =
class=3D""></o:p></span></span></div></div></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">Hi, Robert:<o:p =
class=3D""></o:p></span></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">There are situations that we =
want to distinguish the passive interfaces from the normal interfaces. I =
will try to write one draft in recent days to describe it and for =
further discussion.<o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div></div><div =
class=3D""><p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 12pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" =
class=3D"">Thanks in advance.<o:p class=3D""></o:p></span></p><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">Aijun Wang<o:p class=3D""></o:p></span></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">China Telecom<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D""><br =
class=3D""><br class=3D""><o:p class=3D""></o:p></span></div><p =
class=3D"MsoNormal" style=3D"margin: 0cm 0cm 12pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;"><span lang=3D"EN-US" class=3D"">On Jan =
7, 2020, at 18:14, Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">robert@raszuk.net</a>&gt; wrote:<o:p =
class=3D""></o:p></span></p></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D"" type=3D"cite"><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D"">=EF=BB=BF<=
o:p class=3D""></o:p></span></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D"">Hi =
Aijun,<o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">Right .. I took =
your&nbsp;email as an attempt/request&nbsp;to actually advertise passive =
links in the first place.&nbsp;<o:p class=3D""></o:p></span></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" class=3D"">May we know what difference does it make to =
you if reachable prefix is part of an active vs passive interface from =
IGP point of&nbsp;view ?&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D"">Thx,<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">R.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div></div></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D"">On Tue, =
Jan 7, 2020 at 2:08 AM Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn" style=3D"color: purple; =
text-decoration: underline;" class=3D"">wangaijun@tsinghua.org..cn</a>&gt;=
 wrote:<o:p class=3D""></o:p></span></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-width: 1pt; =
border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; =
margin-left: 4.8pt; margin-right: 0cm;" class=3D"" type=3D"cite"><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi, Robert:</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-family: Calibri, sans-serif; color: rgb(31, =
73, 125);" class=3D"">Thanks for your information.</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">TLV-22 is used to describe the IS neighbor and the link =
between them. As for the passive interfaces, there may be no =
neighbor.<span class=3D"Apple-converted-space">&nbsp;</span></span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">It seems the sub-TLV within this TLV is not the appropriate =
place to put this information?</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">P.S. I changed the thread to reflect the conversion =
topic.</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=
=E4=BD=93; text-align: justify;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Best Regards.</span><span lang=3D"EN-US" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93; =
text-align: justify;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93; text-align: justify;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Aijun =
Wang</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93; text-align: justify;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">China =
Telecom</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><b class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3D"EN-US" class=3D"">:</span></span></b><span lang=3D"EN-US" =
style=3D"font-size: 10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">lsr-bounces@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>[mailto:<a =
href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">lsr-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span></span><b class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">=E4=BB=A3=E8=A1=A8<span =
class=3D"Apple-converted-space">&nbsp;</span></span></b><span =
lang=3D"EN-US" style=3D"font-size: 10pt;" class=3D"">Robert Raszuk<br =
class=3D""></span><b class=3D""><span style=3D"font-size: 10pt;" =
class=3D"">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span lang=3D"EN-US" =
class=3D"">:</span></span></b><span lang=3D"EN-US" style=3D"font-size: =
10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>2020</span><span =
style=3D"font-size: 10pt;" class=3D"">=E5=B9=B4<span lang=3D"EN-US" =
class=3D"">1</span>=E6=9C=88<span lang=3D"EN-US" =
class=3D"">6</span>=E6=97=A5<span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>18:58<br class=3D""></span><b=
 class=3D"">=E6=94=B6=E4=BB=B6=E4=BA=BA<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Aijun Wang<br =
class=3D""></span><b class=3D"">=E6=8A=84=E9=80=81<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Les Ginsberg =
(ginsberg);<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr@ietf.org" target=3D"_blank" style=3D"color: purple; =
text-decoration: underline;" class=3D"">lsr@ietf.org</a><br =
class=3D""></span><b class=3D"">=E4=B8=BB=E9=A2=98<span lang=3D"EN-US" =
class=3D"">:</span></b><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Lsr]<span =
class=3D"Apple-converted-space">&nbsp;</span></span>=E7=AD=94=E5=A4=8D<spa=
n lang=3D"EN-US" class=3D"">: Is it necessary to expand the IS-IS level =
to 8?</span></span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">Aijun,<o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-width: 1pt; =
border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; =
margin-left: 4.8pt; margin-top: 5pt; margin-right: 0cm;" class=3D"" =
type=3D"cite"><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"color: rgb(31, 73, 125);" class=3D"">We just =
want to distinguish the passive interfaces from other normal interfaces =
within ISIS domain.&nbsp; It seems that the =E2=80=9CAttribute Flags=E2=80=
=9D that described in<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
class=3D""><a href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" =
target=3D"_blank" style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/rfc7794#section-2.1</a><span =
style=3D"color: rgb(31, 73, 125);" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>is the most appropriate =
place to extend to carry such information.</span><o:p =
class=3D""></o:p></span></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
=E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p=
 class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">Really ?<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">IMO much better place is to =
define new sub-TLV of TLV-22 and mark it there as passive link.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">Ref:&nbsp;<a =
href=3D"https://tools.ietf.org/html/rfc5029" target=3D"_blank" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools..ietf.org/html/rfc5029</a><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">Now more interesting perhaps =
is to find out how ISIS is supposed to react to such information. Or is =
the intention to carry it just as an opaque info say for show commands =
use only ?&nbsp;<o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">Thx,<br class=3D"">R.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div></div></div></div></div></blockquote><=
/div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
class=3D"">_______________________________________________<br =
class=3D"">Lsr mailing list<br class=3D""><a href=3D"mailto:Lsr@ietf.org" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">Lsr@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.ietf.org/mailman/listinfo/lsr</a><o:p =
class=3D""></o:p></span></div></div></blockquote></div></div><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
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text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" =
class=3D"">_______________________________________________</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
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text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
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display: inline !important;" class=3D"">Lsr mailing list</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
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text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
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class=3D"">Lsr@ietf.org</a></span><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 14px; font-style: normal; =
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normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
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class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/lsr" =
class=3D"">https://www.ietf.org/mailman/listinfo/lsr</a></span></div></blo=
ckquote></div><br class=3D""></div></body></html>=

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Hi, Tony:

=20

Thanks for your suggestions.

If the behavior of =E2=80=9Cstub link=E2=80=9D is same as that =
=E2=80=9Cpassive interface=E2=80=9D, for example, not sending thing on =
that interface, but can receive, we can modify the description later in =
the updated version of this draft.

For the link attributes that defined in RFC5029, as that stated in =
https://tools.ietf.org/html/rfc5029#section-2, this sub-TLV is included =
in the TLV 22(Extended IS Reachability).=20

As I read the IANA code point =
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.=
xhtml#isis-tlv-codepoints-22-23-25-141-222-223, it notes this sub-TLV =
can be included in all of these TLVs (22,23,25,141,222,223).=20

=20

But, when the interface is configured as passive/stub, it seems that the =
above TLVs will not be advertised, because there is no IS neighbor on =
this passive link. =20

TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be one =
appropriate TLV to include this sub-TLV, but it requires the IS-IS TE =
deployment, and is not suitable for describing the passive/stub link on =
edge router.

=20

In summary, it seems put this attribute into the =E2=80=9CPrefix =
Attribute Flags=E2=80=9D sub-TLV which can be included in TLV =
135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. =
Reach, and MT IPv6 IP. Reach TLVs) is more applicable?

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 tony.li@tony.li
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=8810=E6=97=A5 =
12:00
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Les Ginsberg; Robert Raszuk; lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces =
within ISIS

=20

=20

Hi Aijun,

=20

Thank you for your draft.

=20

First off, a =E2=80=98passive interface=E2=80=99 is a particular user =
interface phrase used by one very particular vendor.  It=E2=80=99s not a =
particularly accurate description, either. For example, a =
=E2=80=98passive=E2=80=99 interface implies that it might

accept protocol packets, but would not be active and send things on that =
interface.  That might have been meaningful in the distance vector days, =
but we=E2=80=99re decades past that now. The =E2=80=99stub link=E2=80=99 =
designation=20

sounds more accurate.

=20

But that=E2=80=99s just naming.

=20

As to mechanism, it seems to me that we already have the mechanisms that =
you want. Specifically, RFC 5029 already gives us a way of capturing =
link attributes. It would seem to me that all you need is a code point =
from that registry and you=E2=80=99d be done.  I=E2=80=99d recommend you =
direct your draft in that direction.

=20

Regards,

Tony

=20

=20

=20





On Jan 9, 2020, at 6:22 PM, Aijun Wang <wangaijun@tsinghua.org.cn> =
wrote:

=20

Hi, Les, Robert and other experts within LSR:

=20

We have submitted the draft that related to the passive interface =
attribute, please review it at   =
<https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-0=
0> =
https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00=


=20

If you are interested, we are also welcome you as the co-author to put =
forward it together.

Any comments are welcome.

=20

Thanks in advance.

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Aijun Wang
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=887=E6=97=A5 =
18:57
=E6=94=B6=E4=BB=B6=E4=BA=BA: Robert Raszuk
=E6=8A=84=E9=80=81: Les Ginsberg (ginsberg); lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces =
within ISIS

=20

Hi, Robert:

There are situations that we want to distinguish the passive interfaces =
from the normal interfaces. I will try to write one draft in recent days =
to describe it and for further discussion.

=20

Thanks in advance.

Aijun Wang

China Telecom






On Jan 7, 2020, at 18:14, Robert Raszuk < <mailto:robert@raszuk.net> =
robert@raszuk.net> wrote:

=EF=BB=BF

Hi Aijun,

=20

Right .. I took your email as an attempt/request to actually advertise =
passive links in the first place.=20

=20

May we know what difference does it make to you if reachable prefix is =
part of an active vs passive interface from IGP point of view ?=20

=20

Thx,

R.

=20

=20

On Tue, Jan 7, 2020 at 2:08 AM Aijun Wang < =
<mailto:wangaijun@tsinghua.org.cn> wangaijun@tsinghua.org..cn> wrote:

Hi, Robert:

=20

Thanks for your information.

TLV-22 is used to describe the IS neighbor and the link between them. As =
for the passive interfaces, there may be no neighbor.=20

It seems the sub-TLV within this TLV is not the appropriate place to put =
this information?

=20

P.S. I changed the thread to reflect the conversion topic.

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA:  <mailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org [mailto: <mailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Robert Raszuk
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=886=E6=97=A5 =
18:58
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Les Ginsberg (ginsberg);  <mailto:lsr@ietf.org> =
lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] =E7=AD=94=E5=A4=8D: Is it necessary to =
expand the IS-IS level to 8?

=20

Aijun,

=20

We just want to distinguish the passive interfaces from other normal =
interfaces within ISIS domain.  It seems that the =E2=80=9CAttribute =
Flags=E2=80=9D that described in  =
<https://tools.ietf.org/html/rfc7794#section-2.1> =
https://tools.ietf.org/html/rfc7794#section-2.1 is the most appropriate =
place to extend to carry such information.

=20

Really ?

=20

IMO much better place is to define new sub-TLV of TLV-22 and mark it =
there as passive link.

=20

Ref:  <https://tools.ietf.org/html/rfc5029> =
https://tools..ietf.org/html/rfc5029

=20

Now more interesting perhaps is to find out how ISIS is supposed to =
react to such information. Or is the intention to carry it just as an =
opaque info say for show commands use only ?=20

=20

Thx,
R.

=20

_______________________________________________
Lsr mailing list
 <mailto:Lsr@ietf.org> Lsr@ietf.org
 <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

=20


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Tony:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks for your suggestions.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>If the behavior of =E2=80=9Cstub link=E2=80=9D is same as that =
=E2=80=9Cpassive interface=E2=80=9D, for example, not sending thing on =
that interface, but can receive, we can modify the description later in =
the updated version of this draft.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>For the link attributes that defined in RFC5029, as that stated in =
</span><span lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/rfc5029#section-2">https://tools.ietf=
.org/html/rfc5029#section-2</a>, </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>this sub-TLV is included in the TLV 22(Extended IS Reachability). =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>As I read the IANA code point </span><span lang=3DEN-US><a =
href=3D"https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-cod=
epoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223">https://www.iana.=
org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-co=
depoints-22-23-25-141-222-223</a><span style=3D'color:#1F497D'>, =
</span></span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>it notes this sub-TLV can be included in all of these TLVs =
(22,23,25,141,222,223). <o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>But, when the interface is configured as passive/stub, it seems that =
the above TLVs will not be advertised, because there is no IS neighbor =
on this passive link.=C2=A0 <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be =
one appropriate TLV to include this sub-TLV, but it requires the IS-IS =
TE deployment, and is not suitable for describing the passive/stub link =
on edge router.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>In summary, it seems put this attribute into the =E2=80=9CPrefix =
Attribute Flags=E2=80=9D sub-TLV which can be included in TLV =
135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. =
Reach, and MT IPv6 IP. Reach TLVs) is more =
applicable?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt'>tony.li@tony.li<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>10</span>=E6=97=A5<span =
lang=3DEN-US> 12:00<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Les Ginsberg; Robert Raszuk; =
lsr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Methods to label =
the passive interfaces within =
ISIS<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p =
class=3DMsoNormal><span lang=3DEN-US>Hi =
Aijun,<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Thank you for your =
draft.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>First off, a =E2=80=98passive =
interface=E2=80=99 is a particular user interface phrase used by one =
very particular vendor. &nbsp;It=E2=80=99s not a particularly accurate =
description, either. For example, a =E2=80=98passive=E2=80=99 interface =
implies that it might<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>accept protocol packets, but would =
not be active and send things on that interface. &nbsp;That might have =
been meaningful in the distance vector days, but we=E2=80=99re decades =
past that now. The =E2=80=99stub link=E2=80=99 =
designation&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>sounds more =
accurate.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>But that=E2=80=99s just =
naming.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>As to mechanism, it seems to me =
that we already have the mechanisms that you want. Specifically, RFC =
5029 already gives us a way of capturing link attributes. It would seem =
to me that all you need is a code point from that registry and =
you=E2=80=99d be done. &nbsp;I=E2=80=99d recommend you direct your draft =
in that direction.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Regards,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Tony<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><br><br><o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US>On Jan 9, 2020, at 6:22 PM, Aijun =
Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; wrote:<o:p></o:p></span></p></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Les, Robert and other experts within LSR:</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>We have submitted the draft that related to the passive interface =
attribute, please review it at &nbsp;</span><span lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attr=
ibute-00"><span =
style=3D'color:purple'>https://tools.ietf.org/html/draft-wang-lsr-passive=
-interface-attribute-00</span></a><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>If you are interested, we are also welcome you as the co-author to =
put forward it together.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Any comments are welcome.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks in advance.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom</span><span lang=3DEN-US><o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><div><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span =
class=3Dapple-converted-space><span lang=3DEN-US =
style=3D'font-size:10.0pt'>&nbsp;</span></span><span lang=3DEN-US =
style=3D'font-size:10.0pt'><a =
href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a> [<a =
href=3D"mailto:lsr-bounces@ietf.org">mailto:lsr-bounces@ietf.org</a>]<spa=
n class=3Dapple-converted-space>&nbsp;</span></span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8<span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'>Aijun Wang<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span =
class=3Dapple-converted-space><span lang=3DEN-US =
style=3D'font-size:10.0pt'>&nbsp;</span></span><span lang=3DEN-US =
style=3D'font-size:10.0pt'>2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>7</span>=E6=97=A5<span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span =
lang=3DEN-US>18:57<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Robert =
Raszuk<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Les Ginsberg =
(ginsberg); <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br></span><b>=E4=B8=BB=E9=A2=
=98<span lang=3DEN-US>:</span></b><span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Re: [Lsr] Methods to =
label the passive interfaces within ISIS</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Hi, =
Robert:<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>There are situations that we want to distinguish the =
passive interfaces from the normal interfaces. I will try to write one =
draft in recent days to describe it and for further =
discussion.<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
lang=3DEN-US>Thanks in advance.<o:p></o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Aijun =
Wang<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>China =
Telecom<o:p></o:p></span></p></div></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><br><br><br><o:p></o:p></span></p></div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span lang=3DEN-US>On =
Jan 7, 2020, at 18:14, Robert Raszuk &lt;<a =
href=3D"mailto:robert@raszuk.net"><span =
style=3D'color:purple'>robert@raszuk.net</span></a>&gt; =
wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>=EF=BB=BF</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Hi =
Aijun,<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Right .. I took your&nbsp;email as =
an attempt/request&nbsp;to actually advertise passive links in the first =
place.&nbsp;<o:p></o:p></span></p></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>May we know what difference does it =
make to you if reachable prefix is part of an active vs passive =
interface from IGP point of&nbsp;view =
?&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Thx,<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>R.<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div></div></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>On Tue, Jan 7, 2020 at 2:08 AM =
Aijun Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn"><span =
style=3D'color:purple'>wangaijun@tsinghua.org..cn</span></a>&gt; =
wrote:<o:p></o:p></span></p></div></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5=
.0pt'><div><div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Robert:</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for =
your information.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>TLV-22 is used to describe the IS neighbor and the link between them. =
As for the passive interfaces, there may be no neighbor.<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>It seems the sub-TLV within this TLV is not the appropriate place to =
put this information?</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>P.S. I changed the thread to reflect the conversion =
topic.</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom</span><span lang=3DEN-US><o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><div><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span =
class=3Dapple-converted-space><span lang=3DEN-US =
style=3D'font-size:10.0pt'>&nbsp;</span></span><span lang=3DEN-US =
style=3D'font-size:10.0pt'><a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank"><span =
style=3D'color:purple'>lsr-bounces@ietf.org</span></a><span =
class=3Dapple-converted-space>&nbsp;</span>[mailto:<a =
href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank"><span =
style=3D'color:purple'>lsr-bounces@ietf.org</span></a>]<span =
class=3Dapple-converted-space>&nbsp;</span></span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8<span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'>Robert Raszuk<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span =
class=3Dapple-converted-space><span lang=3DEN-US =
style=3D'font-size:10.0pt'>&nbsp;</span></span><span lang=3DEN-US =
style=3D'font-size:10.0pt'>2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>6</span>=E6=97=A5<span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span =
lang=3DEN-US>18:58<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Les Ginsberg =
(ginsberg);<span class=3Dapple-converted-space>&nbsp;</span><a =
href=3D"mailto:lsr@ietf.org" target=3D"_blank"><span =
style=3D'color:purple'>lsr@ietf.org</span></a><br></span><b>=E4=B8=BB=E9=A2=
=98<span lang=3DEN-US>:</span></b><span =
class=3Dapple-converted-space><span =
lang=3DEN-US>&nbsp;</span></span><span lang=3DEN-US>Re: [Lsr]<span =
class=3Dapple-converted-space>&nbsp;</span></span>=E7=AD=94=E5=A4=8D<span=
 lang=3DEN-US>: Is it necessary to expand the IS-IS level to =
8?</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Aijun,<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5=
.0pt'><div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>We just want to distinguish the passive =
interfaces from other normal interfaces within ISIS domain.&nbsp; It =
seems that the </span><span style=3D'color:#1F497D'>=E2=80=9C<span =
lang=3DEN-US>Attribute Flags</span>=E2=80=9D<span lang=3DEN-US> that =
described in<span =
class=3Dapple-converted-space>&nbsp;</span></span></span><span =
lang=3DEN-US><a href=3D"https://tools.ietf.org/html/rfc7794#section-2.1" =
target=3D"_blank"><span =
style=3D'color:purple'>https://tools.ietf.org/html/rfc7794#section-2.1</s=
pan></a><span class=3Dapple-converted-space><span =
style=3D'color:#1F497D'>&nbsp;</span></span><span =
style=3D'color:#1F497D'>is the most appropriate place to extend to carry =
such =
information.</span><o:p></o:p></span></p></div></div></blockquote><div><d=
iv><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Really =
?<o:p></o:p></span></p></div></div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>IMO much better place is to define =
new sub-TLV of TLV-22 and mark it there as passive =
link.<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Ref:&nbsp;<a =
href=3D"https://tools.ietf.org/html/rfc5029" target=3D"_blank"><span =
style=3D'color:purple'>https://tools..ietf.org/html/rfc5029</span></a><o:=
p></o:p></span></p></div></div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Now more interesting perhaps is to =
find out how ISIS is supposed to react to such information. Or is the =
intention to carry it just as an opaque info say for show commands use =
only ?&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Thx,<br>R.<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div></div></div></div></=
div></blockquote></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>_______________________________________________<br>Lsr =
mailing list<br><a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:purple'>Lsr@ietf.org</span></a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:purple'>https://www.ietf.org/mailman/listinfo/lsr</span></=
a><o:p></o:p></span></p></div></div></blockquote></div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Helvetica","sans-serif"'>_________=
______________________________________<br>Lsr mailing list<br><a =
href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/m=
ailman/listinfo/lsr</a></span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></body></html>
------=_NextPart_000_00BC_01D5C7C8.5660D1B0--


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Cc: Les Ginsberg <ginsberg@cisco.com>, Robert Raszuk <robert@raszuk.net>, lsr@ietf.org
To: Aijun Wang <wangaijun@tsinghua.org.cn>
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Aijun,


> For the link attributes that defined in RFC5029, as that stated in =
https://tools.ietf.org/html/rfc5029#section-2 =
<https://tools.ietf.org/html/rfc5029#section-2>, this sub-TLV is =
included in the TLV 22(Extended IS Reachability).=20
> As I read the IANA code point =
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.x=
html#isis-tlv-codepoints-22-23-25-141-222-223 =
<https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.=
xhtml#isis-tlv-codepoints-22-23-25-141-222-223>, it notes this sub-TLV =
can be included in all of these TLVs (22,23,25,141,222,223).=20
> =20
> But, when the interface is configured as passive/stub, it seems that =
the above TLVs will not be advertised, because there is no IS neighbor =
on this passive link. =20


Fair point. Given that there is an IP address and prefix on that link, =
it would be very reasonable to advertise the Extended IP Reachability =
TLV (135). We would then need to make the link attributes sub-TLV =
applicable to this TLV (and it=E2=80=99s MT brother).


> TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be =
one appropriate TLV to include this sub-TLV, but it requires the IS-IS =
TE deployment, and is not suitable for describing the passive/stub link =
on edge router.
> =20
> In summary, it seems put this attribute into the =E2=80=9CPrefix =
Attribute Flags=E2=80=9D sub-TLV which can be included in TLV =
135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. =
Reach, and MT IPv6 IP. Reach TLVs) is more applicable?


It would seem to me that what you=E2=80=99re describing is an attribute =
of a link, not of a prefix, thus I would favor it remaining a link =
attribute.

But that=E2=80=99s just me.  :-)

Tony


--Apple-Mail=_2464CEED-AD95-4366-8D0C-427F300E5086
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><br class=3D""></div>Hi Aijun,<div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">For the link attributes that defined in =
RFC5029, as that stated in<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
class=3D""><a href=3D"https://tools.ietf.org/html/rfc5029#section-2" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/rfc5029#section-2</a>,<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">this sub-TLV is included in the TLV =
22(Extended IS Reachability).<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">As I read the IANA code =
point<span class=3D"Apple-converted-space">&nbsp;</span></span><span =
lang=3D"EN-US" class=3D""><a =
href=3D"https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-code=
points.xhtml#isis-tlv-codepoints-22-23-25-141-222-223" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-c=
odepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223</a><span =
style=3D"color: rgb(31, 73, 125);" class=3D"">,<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">it notes this sub-TLV =
can be included in all of these TLVs (22,23,25,141,222,223).<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">But, when the =
interface is configured as passive/stub, it seems that the above TLVs =
will not be advertised, because there is no IS neighbor on this passive =
link.&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></div></div></div></bl=
ockquote><div><br class=3D""></div><div><br class=3D""></div><div>Fair =
point. Given that there is an IP address and prefix on that link, it =
would be very reasonable to advertise the Extended IP Reachability TLV =
(135). We would then need to make the link attributes sub-TLV applicable =
to this TLV (and it=E2=80=99s MT brother).</div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">TLV 141 =E2=80=9CInter-AS=
 reachability information=E2=80=9D seems be one appropriate TLV to =
include this sub-TLV, but it requires the IS-IS TE deployment, and is =
not suitable for describing the passive/stub link on edge router.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">In summary, it =
seems put this attribute into the =E2=80=9CPrefix Attribute Flags=E2=80=9D=
 sub-TLV which can be included in TLV 135,235,236 and 237 (Extended IP =
reachability, MT IP. Reach, IPv6 IP. Reach, and MT IPv6 IP. Reach TLVs) =
is more applicable?</span></div></div></blockquote><br =
class=3D""></div></div><div><br class=3D""></div><div>It would seem to =
me that what you=E2=80=99re describing is an attribute of a link, not of =
a prefix, thus I would favor it remaining a link =
attribute.</div><div><br class=3D""></div><div>But that=E2=80=99s just =
me. &nbsp;:-)</div><div><br class=3D""></div><div>Tony</div><div><br =
class=3D""></div></body></html>=

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In-Reply-To: <32D6BF50-90F8-40C1-81B3-4DA6646F3F6E@tony.li>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 10 Jan 2020 13:26:55 +0100
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To: Tony Li <tony.li@tony.li>
Cc: Aijun Wang <wangaijun@tsinghua.org.cn>, Les Ginsberg <ginsberg@cisco.com>,  lsr@ietf.org
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Tony,

I agree with you that essentially this is a link property (hence my earlier
hint towards 5029) so it makes it at least two of us recommending direction
towards 5029 now ;)

While we are at this perhaps it would be also useful to be able to
differentiate reachability on stub links vs virtual local interfaces. Today
in some implementations they are advertised after marking them as passive
int.

Thx
R.


On Fri, Jan 10, 2020, 08:26 <tony.li@tony.li> wrote:

>
> Hi Aijun,
>
>
> For the link attributes that defined in RFC5029, as that stated in
> https://tools.ietf.org/html/rfc5029#section-2, this sub-TLV is included
> in the TLV 22(Extended IS Reachability).
> As I read the IANA code point
> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.=
xhtml#isis-tlv-codepoints-22-23-25-141-222-223
> , it notes this sub-TLV can be included in all of these TLVs
> (22,23,25,141,222,223).
>
> But, when the interface is configured as passive/stub, it seems that the
> above TLVs will not be advertised, because there is no IS neighbor on thi=
s
> passive link.
>
>
>
> Fair point. Given that there is an IP address and prefix on that link, it
> would be very reasonable to advertise the Extended IP Reachability TLV
> (135). We would then need to make the link attributes sub-TLV applicable =
to
> this TLV (and it=E2=80=99s MT brother).
>
>
> TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be one =
appropriate TLV
> to include this sub-TLV, but it requires the IS-IS TE deployment, and is
> not suitable for describing the passive/stub link on edge router.
>
> In summary, it seems put this attribute into the =E2=80=9CPrefix Attribut=
e Flags=E2=80=9D
> sub-TLV which can be included in TLV 135,235,236 and 237 (Extended IP
> reachability, MT IP. Reach, IPv6 IP. Reach, and MT IPv6 IP. Reach TLVs) i=
s
> more applicable?
>
>
>
> It would seem to me that what you=E2=80=99re describing is an attribute o=
f a link,
> not of a prefix, thus I would favor it remaining a link attribute.
>
> But that=E2=80=99s just me.  :-)
>
> Tony
>
>

--0000000000007cbd96059bc83e5b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div>Hi Tony,<div dir=3D"auto"><br></div><div dir=3D"auto=
">I agree with you that essentially this is a link property (hence my earli=
er hint towards 5029) so it makes it at least two of us recommending direct=
ion towards 5029 now ;)</div><div dir=3D"auto"><br></div><div dir=3D"auto">=
While we are at this perhaps it would be also useful to be able to differen=
tiate reachability on stub links vs virtual local interfaces. Today in some=
 implementations they are advertised after marking them as passive int.</di=
v><div dir=3D"auto"><br></div><div dir=3D"auto">Thx</div><div dir=3D"auto">=
R.</div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Fri, Jan 10, 2020, 08:26  &lt;<a href=3D"mailto:tony.li@tony.li">t=
ony.li@tony.li</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space"><div><br></div>=
Hi Aijun,<div><br></div><div><br><div><blockquote type=3D"cite"><div><div s=
tyle=3D"font-family:Helvetica;font-size:14px;font-style:normal;font-variant=
-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text=
-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-de=
coration:none"><div style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-fa=
mily:=E5=AE=8B=E4=BD=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)">For the link attributes t=
hat defined in RFC5029, as that stated in<span>=C2=A0</span></span><span la=
ng=3D"EN-US"><a href=3D"https://tools.ietf.org/html/rfc5029#section-2" styl=
e=3D"color:purple;text-decoration:underline" target=3D"_blank" rel=3D"noref=
errer">https://tools.ietf.org/html/rfc5029#section-2</a>,<span>=C2=A0</span=
></span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)">this sub-TLV is included in the TLV 22(Ext=
ended IS Reachability).<span>=C2=A0</span><u></u><u></u></span></div><div s=
tyle=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=8B=E4=BD=
=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">As I read the IANA code point<span>=C2=A0</sp=
an></span><span lang=3D"EN-US"><a href=3D"https://www.iana.org/assignments/=
isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-=
141-222-223" style=3D"color:purple;text-decoration:underline" target=3D"_bl=
ank" rel=3D"noreferrer">https://www.iana.org/assignments/isis-tlv-codepoint=
s/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223</a><sp=
an style=3D"color:rgb(31,73,125)">,<span>=C2=A0</span></span></span><span l=
ang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;colo=
r:rgb(31,73,125)">it notes this sub-TLV can be included in all of these TLV=
s (22,23,25,141,222,223).<span>=C2=A0</span><u></u><u></u></span></div><div=
 style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=8B=E4=
=BD=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div styl=
e=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=8B=E4=BD=93"=
><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-se=
rif;color:rgb(31,73,125)">But, when the interface is configured as passive/=
stub, it seems that the above TLVs will not be advertised, because there is=
 no IS neighbor on this passive link.=C2=A0<span>=C2=A0</span></span></div>=
</div></div></blockquote><div><br></div><div><br></div><div>Fair point. Giv=
en that there is an IP address and prefix on that link, it would be very re=
asonable to advertise the Extended IP Reachability TLV (135). We would then=
 need to make the link attributes sub-TLV applicable to this TLV (and it=E2=
=80=99s MT brother).</div><div><br></div><br><blockquote type=3D"cite"><div=
 style=3D"font-family:Helvetica;font-size:14px;font-style:normal;font-varia=
nt-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;te=
xt-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-=
decoration:none"><div style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-=
family:=E5=AE=8B=E4=BD=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;f=
ont-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u><u></u></span></=
div><div style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=
=8B=E4=BD=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Ca=
libri,sans-serif;color:rgb(31,73,125)">TLV 141 =E2=80=9CInter-AS reachabili=
ty information=E2=80=9D seems be one appropriate TLV to include this sub-TL=
V, but it requires the IS-IS TE deployment, and is not suitable for describ=
ing the passive/stub link on edge router.<u></u><u></u></span></div><div st=
yle=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=8B=E4=BD=
=93"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=
=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:=E5=AE=8B=E4=BD=93">=
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:rgb(31,73,125)">In summary, it seems put this attribute into the =
=E2=80=9CPrefix Attribute Flags=E2=80=9D sub-TLV which can be included in T=
LV 135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. Re=
ach, and MT IPv6 IP. Reach TLVs) is more applicable?</span></div></div></bl=
ockquote><br></div></div><div><br></div><div>It would seem to me that what =
you=E2=80=99re describing is an attribute of a link, not of a prefix, thus =
I would favor it remaining a link attribute.</div><div><br></div><div>But t=
hat=E2=80=99s just me. =C2=A0:-)</div><div><br></div><div>Tony</div><div><b=
r></div></div></blockquote></div></div></div>

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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Robert,

> I agree with you that essentially this is a link property (hence my =
earlier hint towards 5029) so it makes it at least two of us =
recommending direction towards 5029 now ;)


Is that rough consensus? ;-)


> While we are at this perhaps it would be also useful to be able to =
differentiate reachability on stub links vs virtual local interfaces. =
Today in some implementations they are advertised after marking them as =
passive int.


If we want to define another attribute for a loopback link vs a stub =
link vs a tunnel vs =E2=80=A6. , I would support that direction.

Tony



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Subject: Re: [Lsr] [Technical Errata Reported] RFC2328 (5956)
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On January 9, 2020 at 7:53:17 PM, Marcelo Bustani wrote:

Marcelo:

Ol=C3=A1!


> My intention was to mitigate a possible misunderstanding or a multiple
> different interpretations, that I guess it is happening with Cisco and
> Juniper; both are not wrong depending from the section they are based on.


That should not be the case.

In the two specific cases that you initially mentioned, for Loopbacks
and the stub link to describe a p2mp, the text is clear: "cost set to
0". =C2=A0I don't understand how it is possible to have a different
interpretation of that.

I do understand how vendors can and do provide knobs that can change
the configured cost...but the default is still clear in the RFC: "cost
set to 0". =C2=A0If that is not the default, then I think it is a bug in
the implementation and not in the RFC.


The Errata Reporting process is in place to correct errors in the
RFCs. =C2=A0In this case, I don't think there is an error.

If you have suggestions to change the text to clarify (which is
different than correcting an error), then that is something that
should be discussed in the WG (lsr@ietf.org). =C2=A0rfc2328 is far from
perfect; I'm sure there is room for improvement.

Thanks!

Alvaro.


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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>,  "draft-ietf-isis-te-app@ietf.org" <draft-ietf-isis-te-app@ietf.org>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-te-app-09
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On January 10, 2020 at 10:53:40 AM, Les Ginsberg wrote:

Les:

Hi!

> We are working on addressing your comments - but it will take us a bit of
> time to complete that - please be patient.

You have all been very patient with me already -- I can only return
the favor. :-)


> One question. In several places you are requesting a forward reference to=
 the
> IANA Considerations section. For example in Section 4.1.
> I find this ask rather unusual.
> Section 4.1 is defining the format of some fields in the new sub-TLV. Wha=
t
> would be the need of a forward reference to the IANA section?
> I cannot recall ever doing the equivalent in any draft I have worked on.


231	4.1. =C2=A0Application Identifier Bit Mask

233	 =C2=A0Identification of the set of applications associated with link
234	 =C2=A0attribute advertisements utilizes two bit masks. =C2=A0One bit m=
ask is for
235	 =C2=A0standard applications where the definition of each bit is define=
d in
236	 =C2=A0a new IANA controlled registry. =C2=A0A second bit mask is for n=
on-
237	 =C2=A0standard User Defined Applications(UDAs).

In this case, there is a mention in the text about the new registry --
I thought it would be useful to the reader to have a pointer to where
the values are.

The comment was meant just as a suggestion.

Alvaro.


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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: <tony.li@tony.li>
Cc: "'Les Ginsberg'" <ginsberg@cisco.com>, "'Robert Raszuk'" <robert@raszuk.net>, <lsr@ietf.org>
References: <CAOj+MMHAbGo+0qd+xwTmymx4MYXGWmHe0p+d2ychQLQWUZ78wA@mail.gmail.com> <FC0F3982-2182-4CFB-8D60-A702C72BB87F@tsinghua.org.cn> <006901d5c75c$c24ad360$46e07a20$@org.cn> <BCA056AC-76B2-45B6-9FD0-61A5EBFC740C@tony.li> <00bb01d5c785$483d91b0$d8b8b510$@org.cn> <32D6BF50-90F8-40C1-81B3-4DA6646F3F6E@tony.li>
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Date: Mon, 13 Jan 2020 16:39:05 +0800
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Subject: [Lsr] =?utf-8?b?562U5aSNOiAgTWV0aG9kcyB0byBsYWJlbCB0aGUgcGFzc2l2?= =?utf-8?q?e_interfaces_within_ISIS?=
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Hi, Tony:

=20

Is it reasonable to put the link attribute information into the =
=E2=80=9CIP Reachability TLV=E2=80=9D?

IMHO, such stub link is not the normal links within IGP domain.  Label =
the related prefix is coming from the passive/stub link seems also =
acceptable?

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 tony.li@tony.li
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B41=E6=9C=8810=E6=97=A5 =
15:27
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Les Ginsberg; Robert Raszuk; lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Methods to label the passive interfaces =
within ISIS

=20

=20

Hi Aijun,

=20

=20

For the link attributes that defined in RFC5029, as that stated in  =
<https://tools.ietf.org/html/rfc5029#section-2> =
https://tools.ietf.org/html/rfc5029#section-2, this sub-TLV is included =
in the TLV 22(Extended IS Reachability).=20

As I read the IANA code point  =
<https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints=
.xhtml#isis-tlv-codepoints-22-23-25-141-222-223> =
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.=
xhtml#isis-tlv-codepoints-22-23-25-141-222-223, it notes this sub-TLV =
can be included in all of these TLVs (22,23,25,141,222,223).=20

=20

But, when the interface is configured as passive/stub, it seems that the =
above TLVs will not be advertised, because there is no IS neighbor on =
this passive link. =20

=20

=20

Fair point. Given that there is an IP address and prefix on that link, =
it would be very reasonable to advertise the Extended IP Reachability =
TLV (135). We would then need to make the link attributes sub-TLV =
applicable to this TLV (and it=E2=80=99s MT brother).

=20





TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be one =
appropriate TLV to include this sub-TLV, but it requires the IS-IS TE =
deployment, and is not suitable for describing the passive/stub link on =
edge router.

=20

In summary, it seems put this attribute into the =E2=80=9CPrefix =
Attribute Flags=E2=80=9D sub-TLV which can be included in TLV =
135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. =
Reach, and MT IPv6 IP. Reach TLVs) is more applicable?

=20

=20

It would seem to me that what you=E2=80=99re describing is an attribute =
of a link, not of a prefix, thus I would favor it remaining a link =
attribute.

=20

But that=E2=80=99s just me.  :-)

=20

Tony

=20


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi, Tony:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Is it reasonable to put the link attribute information into the =
=E2=80=9CIP Reachability TLV=E2=80=9D?<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>IMHO, such stub link is not the normal links within IGP domain.=C2=A0 =
Label the related prefix is coming from the passive/stub link seems also =
acceptable?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>China Telecom<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt'>=E4=BB=A3=E8=A1=A8 </span></b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt'>tony.li@tony.li<br></span><b><span =
style=3D'font-size:10.0pt'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4<span =
lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt'> 2020</span><span =
style=3D'font-size:10.0pt'>=E5=B9=B4<span =
lang=3DEN-US>1</span>=E6=9C=88<span lang=3DEN-US>10</span>=E6=97=A5<span =
lang=3DEN-US> 15:27<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Les Ginsberg; Robert Raszuk; =
lsr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Methods to label =
the passive interfaces within =
ISIS<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p =
class=3DMsoNormal><span lang=3DEN-US>Hi =
Aijun,<o:p></o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>For the link attributes that defined in RFC5029, as that stated =
in<span class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US><a =
href=3D"https://tools.ietf.org/html/rfc5029#section-2"><span =
style=3D'color:purple'>https://tools.ietf.org/html/rfc5029#section-2</spa=
n></a>,<span class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>this sub-TLV is included in the TLV 22(Extended IS =
Reachability).<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>As I read the IANA code point<span =
class=3Dapple-converted-space>&nbsp;</span></span><span lang=3DEN-US><a =
href=3D"https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-cod=
epoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223"><span =
style=3D'color:purple'>https://www.iana.org/assignments/isis-tlv-codepoin=
ts/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223</sp=
an></a><span style=3D'color:#1F497D'>,<span =
class=3Dapple-converted-space>&nbsp;</span></span></span><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>it notes this sub-TLV can be included in all of these TLVs =
(22,23,25,141,222,223).<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>But, when the interface is configured as passive/stub, it seems that =
the above TLVs will not be advertised, because there is no IS neighbor =
on this passive link.&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US><o:p></o:p></span></p></div></div></blockquote><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Fair point. Given that there is an =
IP address and prefix on that link, it would be very reasonable to =
advertise the Extended IP Reachability TLV (135). We would then need to =
make the link attributes sub-TLV applicable to this TLV (and =
it=E2=80=99s MT brother).<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p =
class=3DMsoNormal><span =
lang=3DEN-US><br><br><o:p></o:p></span></p><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>TLV 141 =E2=80=9CInter-AS reachability information=E2=80=9D seems be =
one appropriate TLV to include this sub-TLV, but it requires the IS-IS =
TE deployment, and is not suitable for describing the passive/stub link =
on edge router.</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>&nbsp;</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>In summary, it seems put this attribute into the =E2=80=9CPrefix =
Attribute Flags=E2=80=9D sub-TLV which can be included in TLV =
135,235,236 and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. =
Reach, and MT IPv6 IP. Reach TLVs) is more applicable?</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>It would seem to me that what =
you=E2=80=99re describing is an attribute of a link, not of a prefix, =
thus I would favor it remaining a link =
attribute.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US>But that=E2=80=99s just me. =
&nbsp;:-)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>Tony<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></div></body></html>
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Sender: Tony Li <tony1athome@gmail.com>
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Cc: Les Ginsberg <ginsberg@cisco.com>, Robert Raszuk <robert@raszuk.net>, lsr@ietf.org
To: Aijun Wang <wangaijun@tsinghua.org.cn>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/yMP9OWDTdW956cRKdMyDmtd7U1I>
Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi Anjun,


> Is it reasonable to put the link attribute information into the =E2=80=9C=
IP Reachability TLV=E2=80=9D?
> IMHO, such stub link is not the normal links within IGP domain.  Label =
the related prefix is coming from the passive/stub link seems also =
acceptable?


Well, a passive interface is really configured so that you advertise the =
interface=E2=80=99s prefix.  Attaching the data that you want to the =
associated data seems reasonable to me.

There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV =
to because there is no neighbor.

Tony



--Apple-Mail=_7B04C669-93C7-43D4-9CFF-E5FEDB3B22C7
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D""><div><br class=3D""></div><div>Hi Anjun,</div><div><br =
class=3D""></div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10.5pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Is it reasonable to put the link attribute =
information into the =E2=80=9CIP Reachability TLV=E2=80=9D?<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: =E5=AE=8B=E4=BD=93;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10.5pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">IMHO, such stub link is =
not the normal links within IGP domain.&nbsp; Label the related prefix =
is coming from the passive/stub link seems also acceptable?<o:p =
class=3D""></o:p></span></div></div></div></blockquote><br =
class=3D""></div><div><br class=3D""></div><div>Well, a passive =
interface is really configured so that you advertise the interface=E2=80=99=
s prefix. &nbsp;Attaching the data that you want to the associated data =
seems reasonable to me.</div><div><br class=3D""></div><div>There=E2=80=99=
s no good IS Neighbor advertisement to attach the sub-TLV to because =
there is no neighbor.</div><div><br =
class=3D""></div><div>Tony</div><div><br class=3D""></div><br =
class=3D""></body></html>=

--Apple-Mail=_7B04C669-93C7-43D4-9CFF-E5FEDB3B22C7--


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "tony.li@tony.li" <tony.li@tony.li>, Aijun Wang <wangaijun@tsinghua.org.cn>
CC: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Methods to label the passive interfaces within ISIS
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Date: Mon, 13 Jan 2020 16:03:14 +0000
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, Aijun Wang <wangaijun@tsinghua.org.cn>
CC: Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Methods to label the passive interfaces within ISIS
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Date: Mon, 13 Jan 2020 10:32:14 -0800
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "=?utf-8?Q?tony.li=40tony.li?=" <tony.li@tony.li>, Aijun Wang <wangaijun@tsinghua.org.cn>,  "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Agree with Acee and Les

Cheers,
Jeff
On Jan 13, 2020, 9:29 AM -0800, Les Ginsberg (ginsberg) <ginsberg=40cisco=
.com>, wrote:
> I agree with Acee that there is no requirement to identify an interface=
 as passive =E2=80=93 or (as suggested in this thread) as loopback or tun=
nel or stub=E2=80=A6
>
> Before debating the best encoding for information, it would be sensible=
 to define the use case/requirements.
> Simply having an advertisement that identifies an interface type isn=E2=
=80=99t sufficient to do anything useful IMO.
>
> =C2=A0=C2=A0 Les
>
> =46rom: Acee Lindem (acee) <acee=40cisco.com>
> Sent: Monday, January 13, 2020 8:03 AM
> To: tony.li=40tony.li; Aijun Wang <wangaijun=40tsinghua.org.cn>
> Cc: Les Ginsberg (ginsberg) <ginsberg=40cisco.com>; Robert Raszuk <robe=
rt=40raszuk.net>; lsr=40ietf.org
> Subject: Re: =5BLsr=5D Methods to label the passive interfaces within I=
SIS
>
> Hi Aijun,
> I guess the external use case for this is advertisement in BGP-LS for N=
etwork Management purposes=3F=3F There really isn=E2=80=99t IS-IS require=
ment to know whether or not an interface is a passive interface.
> Thanks,
> Acee
>
> =46rom: Lsr <lsr-bounces=40ietf.org> on behalf of Tony Li <tony.li=40to=
ny.li>
> Date: Monday, January 13, 2020 at 11:00 AM
> To: Aijun Wang <wangaijun=40tsinghua.org.cn>
> Cc: =22Les Ginsberg (ginsberg)=22 <ginsberg=40cisco.com>, Robert Raszuk=
 <robert=40raszuk.net>, =22lsr=40ietf.org=22 <lsr=40ietf.org>
> Subject: Re: =5BLsr=5D Methods to label the passive interfaces within I=
SIS
>
>
> Hi Anjun,
>
>
> > Is it reasonable to put the link attribute information into the =E2=80=
=9CIP Reachability TLV=E2=80=9D=3F
> > IMHO, such stub link is not the normal links within IGP domain.=C2=A0=
 Label the related prefix is coming from the passive/stub link seems also=
 acceptable=3F
>
>
> Well, a passive interface is really configured so that you advertise th=
e interface=E2=80=99s prefix. =C2=A0Attaching the data that you want to t=
he associated data seems reasonable to me.
>
> There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV=
 to because there is no neighbor.
>
> Tony
>
>
> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> Lsr mailing list
> Lsr=40ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

--5e1cb7b3_28677b7c_496
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Agree with Acee and Les</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Jan 13, 2020, 9:29 AM -0800, Les=
 Ginsberg (ginsberg) &lt;ginsberg=40cisco.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div class=3D=22WordSection1=22>
<p class=3D=22MsoNormal=22>I agree with Acee that there is no requirement=
 to identify an interface as passive =E2=80=93 or (as suggested in this t=
hread) as loopback or tunnel or stub=E2=80=A6</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Before debating the best encoding for informat=
ion, it would be sensible to define the use case/requirements.</p>
<p class=3D=22MsoNormal=22>Simply having an advertisement that identifies=
 an interface type isn=E2=80=99t sufficient to do anything useful IMO.</p=
>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>&=23160;&=23160; Les</p>
<p class=3D=22MsoNormal=22></p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div style=3D=22border:none;border-left:solid blue 1.5pt;padding:0in 0in =
0in 4.0pt=22>
<div>
<div style=3D=22border:none;border-top:solid =23E1E1E1 1.0pt;padding:3.0p=
t 0in 0in 0in=22>
<p class=3D=22MsoNormal=22><b>=46rom:</b> Acee Lindem (acee) &lt;acee=40c=
isco.com&gt;<br />
<b>Sent:</b> Monday, January 13, 2020 8:03 AM<br />
<b>To:</b> tony.li=40tony.li; Aijun Wang &lt;wangaijun=40tsinghua.org.cn&=
gt;<br />
<b>Cc:</b> Les Ginsberg (ginsberg) &lt;ginsberg=40cisco.com&gt;; Robert R=
aszuk &lt;robert=40raszuk.net&gt;; lsr=40ietf.org<br />
<b>Subject:</b> Re: =5BLsr=5D Methods to label the passive interfaces wit=
hin ISIS</p>
</div>
</div>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Hi Aijun,</p>
<p class=3D=22MsoNormal=22>I guess the external use case for this is adve=
rtisement in BGP-LS for Network Management purposes=3F=3F There really is=
n=E2=80=99t IS-IS requirement to know whether or not an interface is a pa=
ssive interface.</p>
<p class=3D=22MsoNormal=22>Thanks,</p>
<p class=3D=22MsoNormal=22>Acee</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div style=3D=22border:none;border-top:solid =23B5C4D=46 1.0pt;padding:3.=
0pt 0in 0in 0in=22>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22><b><span style=3D=
=22font-size:12.0pt;color:black=22>=46rom:</span></b> <span style=3D=22fo=
nt-size:12.0pt;color:black=22>Lsr &lt;<a href=3D=22mailto:lsr-bounces=40i=
etf.org=22>lsr-bounces=40ietf.org</a>&gt; on behalf of Tony Li &lt;<a hre=
f=3D=22mailto:tony.li=40tony.li=22>tony.li=40tony.li</a>&gt;<br />
<b>Date:</b> Monday, January 13, 2020 at 11:00 AM<br />
<b>To:</b> Aijun Wang &lt;<a href=3D=22mailto:wangaijun=40tsinghua.org.cn=
=22>wangaijun=40tsinghua.org.cn</a>&gt;<br />
<b>Cc:</b> =22Les Ginsberg (ginsberg)=22 &lt;<a href=3D=22mailto:ginsberg=
=40cisco.com=22>ginsberg=40cisco.com</a>&gt;, Robert Raszuk &lt;<a href=3D=
=22mailto:robert=40raszuk.net=22>robert=40raszuk.net</a>&gt;, =22<a href=3D=
=22mailto:lsr=40ietf.org=22>lsr=40ietf.org</a>=22 &lt;<a href=3D=22mailto=
:lsr=40ietf.org=22>lsr=40ietf.org</a>&gt;<br />
<b>Subject:</b> Re: =5BLsr=5D Methods to label the passive interfaces wit=
hin ISIS</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>Hi Anjun,</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:0in;margin-right=
:0in;margin-bottom:12.0pt;margin-left:.5in=22>&=23160;</p>
<blockquote style=3D=22margin: 5px 5px; padding-left: 10px; border-left: =
thin solid =23e67e22;=22 class=3D=22spark=5Fquote=22>
<div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22><span style=3D=22=
font-size:10.5pt;color:=231=46497D=22>Is it reasonable to put the link at=
tribute information into the =E2=80=9CIP Reachability TLV=E2=80=9D=3F</sp=
an><span style=3D=22font-size:12.0pt;font-family:SimSun=22></span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22><span style=3D=22=
font-size:10.5pt;color:=231=46497D=22>IMHO, such stub link is not the nor=
mal links within IGP domain.&=23160; Label the related prefix is coming f=
rom the passive/stub link seems also acceptable=3F</span><span style=3D=22=
font-size:12.0pt;font-family:SimSun=22></span></p>
</div>
</div>
</blockquote>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>Well, a passive=
 interface is really configured so that you advertise the interface=E2=80=
=99s prefix. &=23160;Attaching the data that you want to the associated d=
ata seems reasonable to me.</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>There=E2=80=99s=
 no good IS Neighbor advertisement to attach the sub-TLV to because there=
 is no neighbor.</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>Tony</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:0in;margin-right=
:0in;margin-bottom:12.0pt;margin-left:.5in=22>&=23160;</p>
</div>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
</div>
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References: <52685ed7-f7e8-4828-82b1-234f78a8fc39@Spark>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Robert Raszuk <robert@raszuk.net>
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To: Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi, Acee, Les and Jeff:
IGP is used to transfer the topology information within the domain, and the s=
tub/passive interface is the important part of one network, especially for t=
he inter-AS topology.
Currently, we have not figured out other use cases to distinguish other inte=
rfaces type. But for stub/passive interfaces, it will be useful to flooding s=
uch information to other internal routers.
OSPF has already the corresponding consideration and specifications, isn=E2=80=
=99t it reasonable for ISIS to have such capabilities also?


Aijun Wang
China Telecom

> On Jan 14, 2020, at 02:41, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
>=20
> =EF=BB=BF
> Agree with Acee and Les
>=20
> Cheers,
> Jeff
>> On Jan 13, 2020, 9:29 AM -0800, Les Ginsberg (ginsberg) <ginsberg@cisco.c=
om>, wrote:
>> I agree with Acee that there is no requirement to identify an interface a=
s passive =E2=80=93 or (as suggested in this thread) as loopback or tunnel o=
r stub=E2=80=A6
>>=20
>> =20
>>=20
>> Before debating the best encoding for information, it would be sensible t=
o define the use case/requirements.
>>=20
>> Simply having an advertisement that identifies an interface type isn=E2=80=
=99t sufficient to do anything useful IMO.
>>=20
>> =20
>>=20
>>    Les
>>=20
>> =20
>>=20
>> From: Acee Lindem (acee) <acee@cisco.com>
>> Sent: Monday, January 13, 2020 8:03 AM
>> To: tony.li@tony.li; Aijun Wang <wangaijun@tsinghua.org.cn>
>> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Robert Raszuk <robert@r=
aszuk.net>; lsr@ietf.org
>> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
>>=20
>> =20
>>=20
>> Hi Aijun,
>>=20
>> I guess the external use case for this is advertisement in BGP-LS for Net=
work Management purposes?? There really isn=E2=80=99t IS-IS requirement to k=
now whether or not an interface is a passive interface.
>>=20
>> Thanks,
>>=20
>> Acee
>>=20
>> =20
>>=20
>> From: Lsr <lsr-bounces@ietf.org> on behalf of Tony Li <tony.li@tony.li>
>> Date: Monday, January 13, 2020 at 11:00 AM
>> To: Aijun Wang <wangaijun@tsinghua.org.cn>
>> Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert=
@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
>> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
>>=20
>> =20
>>=20
>> =20
>>=20
>> Hi Anjun,
>>=20
>> =20
>>=20
>> =20
>>=20
>> Is it reasonable to put the link attribute information into the =E2=80=9C=
IP Reachability TLV=E2=80=9D?
>>=20
>> IMHO, such stub link is not the normal links within IGP domain.  Label th=
e related prefix is coming from the passive/stub link seems also acceptable?=

>>=20
>> =20
>>=20
>> =20
>>=20
>> Well, a passive interface is really configured so that you advertise the i=
nterface=E2=80=99s prefix.  Attaching the data that you want to the associat=
ed data seems reasonable to me.
>>=20
>> =20
>>=20
>> There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV t=
o because there is no neighbor.
>>=20
>> =20
>>=20
>> Tony
>>=20
>> =20
>>=20
>> =20
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr

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Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Acee, Les and Jeff:<div>IGP is used to t=
ransfer the topology information within the domain, and the stub/passive int=
erface is the important part of one network, especially for the inter-AS top=
ology.</div><div>Currently, we have not figured out other use cases to disti=
nguish other interfaces type. But for stub/passive interfaces, it will be us=
eful to flooding such information to other internal routers.</div><div>OSPF h=
as already the corresponding consideration and specifications, isn=E2=80=99t=
 it reasonable for ISIS to have such capabilities also?</div><div><br><br><d=
iv dir=3D"ltr">Aijun Wang<div>China Telecom</div></div><div dir=3D"ltr"><br>=
<blockquote type=3D"cite">On Jan 14, 2020, at 02:41, Jeff Tantsura &lt;jefft=
ant.ietf@gmail.com&gt; wrote:<br><br></blockquote></div><blockquote type=3D"=
cite"><div dir=3D"ltr">=EF=BB=BF

<title></title>


<div name=3D"messageBodySection">
<div dir=3D"auto">Agree with Acee and Les</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div class=3D"matchFont">Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Jan 13, 2020, 9:29 AM -0800, Les Ginsbe=
rg (ginsberg) &lt;ginsberg@cisco.com&gt;, wrote:<br>
<blockquote type=3D"cite" class=3D"spark_quote" style=3D"margin: 5px 5px; pa=
dding-left: 10px; border-left: thin solid #1abc9c;">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">I agree with Acee that there is no requirement to ide=
ntify an interface as passive =E2=80=93 or (as suggested in this thread) as l=
oopback or tunnel or stub=E2=80=A6</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Before debating the best encoding for information, it=
 would be sensible to define the use case/requirements.</p>
<p class=3D"MsoNormal">Simply having an advertisement that identifies an int=
erface type isn=E2=80=99t sufficient to do anything useful IMO.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;&nbsp; Les</p>
<p class=3D"MsoNormal"></p>
<p class=3D"MsoNormal">&nbsp;</p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4=
.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal"><b>From:</b> Acee Lindem (acee) &lt;acee@cisco.com&gt=
;<br>
<b>Sent:</b> Monday, January 13, 2020 8:03 AM<br>
<b>To:</b> tony.li@tony.li; Aijun Wang &lt;wangaijun@tsinghua.org.cn&gt;<br>=

<b>Cc:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;; Robert Raszuk=
 &lt;robert@raszuk.net&gt;; lsr@ietf.org<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Hi Aijun,</p>
<p class=3D"MsoNormal">I guess the external use case for this is advertiseme=
nt in BGP-LS for Network Management purposes?? There really isn=E2=80=99t IS=
-IS requirement to know whether or not an interface is a passive interface.<=
/p>
<p class=3D"MsoNormal">Thanks,</p>
<p class=3D"MsoNormal">Acee</p>
<p class=3D"MsoNormal">&nbsp;</p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-siz=
e:12.0pt;color:black">From:</span></b> <span style=3D"font-size:12.0pt;color=
:black">Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org=
</a>&gt; on behalf of Tony Li &lt;<a href=3D"mailto:tony.li@tony.li">tony.li=
@tony.li</a>&gt;<br>
<b>Date:</b> Monday, January 13, 2020 at 11:00 AM<br>
<b>To:</b> Aijun Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn">wanga=
ijun@tsinghua.org.cn</a>&gt;<br>
<b>Cc:</b> "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto:ginsberg@cisco.co=
m">ginsberg@cisco.com</a>&gt;, Robert Raszuk &lt;<a href=3D"mailto:robert@ra=
szuk.net">robert@raszuk.net</a>&gt;, "<a href=3D"mailto:lsr@ietf.org">lsr@ie=
tf.org</a>" &lt;<a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi Anjun,</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">&nbsp;</p>
<blockquote style=3D"margin: 5px 5px; padding-left: 10px; border-left: thin s=
olid #e67e22;" class=3D"spark_quote">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:1=
0.5pt;color:#1F497D">Is it reasonable to put the link attribute information i=
nto the =E2=80=9CIP Reachability TLV=E2=80=9D?</span><span style=3D"font-siz=
e:12.0pt;font-family:SimSun"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:1=
0.5pt;color:#1F497D">IMHO, such stub link is not the normal links within IGP=
 domain.&nbsp; Label the related prefix is coming from the passive/stub link=
 seems also acceptable?</span><span style=3D"font-size:12.0pt;font-family:Si=
mSun"></span></p>
</div>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Well, a passive interface i=
s really configured so that you advertise the interface=E2=80=99s prefix. &n=
bsp;Attaching the data that you want to the associated data seems reasonable=
 to me.</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">There=E2=80=99s no good IS=
 Neighbor advertisement to attach the sub-TLV to because there is no neighbo=
r.</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Tony</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">&nbsp;</p>
</div>
</div>
_______________________________________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
https://www.ietf.org/mailman/listinfo/lsr<br></blockquote>
</div>


</div></blockquote></div></body></html>=

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To: Aijun Wang <wangaijun@tsinghua.org.cn>, Jeff Tantsura <jefftant.ietf@gmail.com>
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Thread-Topic: [Lsr] Methods to label the passive interfaces within ISIS
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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From nobody Mon Jan 13 14:48:36 2020
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Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
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To: "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi, Acee:
As Tony suggested also before, we can change the description for =E2=80=9Cpa=
ssive=E2=80=9D to =E2=80=9Cstub=E2=80=9D later.
Is that more acceptable then?


Aijun Wang
China Telecom

> On Jan 14, 2020, at 06:40, Acee Lindem (acee) <acee@cisco.com> wrote:
>=20
> =EF=BB=BF
> Hi Aijun,
> =20
> From: Aijun Wang <wangaijun@tsinghua.org.cn>
> Date: Monday, January 13, 2020 at 5:37 PM
> To: Jeff Tantsura <jefftant.ietf@gmail.com>
> Cc: Acee Lindem <acee@cisco.com>, Tony Li <tony.li@tony.li>, "Les Ginsberg=
 (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Robert Ras=
zuk <robert@raszuk.net>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi, Acee, Les and Jeff:
> IGP is used to transfer the topology information within the domain, and th=
e stub/passive interface is the important part of one network, especially fo=
r the inter-AS topology.
> Currently, we have not figured out other use cases to distinguish other in=
terfaces type. But for stub/passive interfaces, it will be useful to floodin=
g such information to other internal routers.
> =20
> A stub interface is not necessarily a passive interace.
> =20
> OSPF has already the corresponding consideration and specifications, isn=E2=
=80=99t it reasonable for ISIS to have such capabilities also?
> =20
> OSPF doesn=E2=80=99t advertise that an interface is a passive interface. O=
thers routing can=E2=80=99t distinguish a passive interface from any other s=
tub link.
> =20
> Thanks,
> Acee
> =20
>=20
> Aijun Wang
> China Telecom
>=20
>=20
> On Jan 14, 2020, at 02:41, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
>=20
> Agree with Acee and Les
> =20
> Cheers,
> Jeff
> On Jan 13, 2020, 9:29 AM -0800, Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m>, wrote:
>=20
> I agree with Acee that there is no requirement to identify an interface as=
 passive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or=
 stub=E2=80=A6
> =20
> Before debating the best encoding for information, it would be sensible to=
 define the use case/requirements.
> Simply having an advertisement that identifies an interface type isn=E2=80=
=99t sufficient to do anything useful IMO.
> =20
>    Les
> =20
> From: Acee Lindem (acee) <acee@cisco.com>
> Sent: Monday, January 13, 2020 8:03 AM
> To: tony.li@tony.li; Aijun Wang <wangaijun@tsinghua.org.cn>
> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Robert Raszuk <robert@ra=
szuk.net>; lsr@ietf.org
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi Aijun,
> I guess the external use case for this is advertisement in BGP-LS for Netw=
ork Management purposes?? There really isn=E2=80=99t IS-IS requirement to kn=
ow whether or not an interface is a passive interface.
> Thanks,
> Acee
> =20
> From: Lsr <lsr-bounces@ietf.org> on behalf of Tony Li <tony.li@tony.li>
> Date: Monday, January 13, 2020 at 11:00 AM
> To: Aijun Wang <wangaijun@tsinghua.org.cn>
> Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert@=
raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> =20
> Hi Anjun,
> =20
> =20
>=20
> Is it reasonable to put the link attribute information into the =E2=80=9CI=
P Reachability TLV=E2=80=9D?
> IMHO, such stub link is not the normal links within IGP domain.  Label the=
 related prefix is coming from the passive/stub link seems also acceptable?
> =20
> =20
> Well, a passive interface is really configured so that you advertise the i=
nterface=E2=80=99s prefix.  Attaching the data that you want to the associat=
ed data seems reasonable to me.
> =20
> There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to=
 because there is no neighbor.
> =20
> Tony
> =20
> =20
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

--Apple-Mail-4639C4ED-4E3B-4F5E-AFBA-B21504450B0F
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Acee:<div>As Tony suggested also before=
, we can change the description for =E2=80=9Cpassive=E2=80=9D to =E2=80=9Cst=
ub=E2=80=9D later.</div><div>Is that more acceptable then?</div><div><br><br=
><div dir=3D"ltr">Aijun Wang<div>China Telecom</div></div><div dir=3D"ltr"><=
br><blockquote type=3D"cite">On Jan 14, 2020, at 06:40, Acee Lindem (acee) &=
lt;acee@cisco.com&gt; wrote:<br><br></blockquote></div><blockquote type=3D"c=
ite"><div dir=3D"ltr">=EF=BB=BF

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)">
<style><!--
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Aijun, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-siz=
e:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Aijun Wang &lt;wanga=
ijun@tsinghua.org.cn&gt;<br>
<b>Date: </b>Monday, January 13, 2020 at 5:37 PM<br>
<b>To: </b>Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt;<br>
<b>Cc: </b>Acee Lindem &lt;acee@cisco.com&gt;, Tony Li &lt;tony.li@tony.li&g=
t;, "Les Ginsberg (ginsberg)" &lt;ginsberg@cisco.com&gt;, "lsr@ietf.org" &lt=
;lsr@ietf.org&gt;, Robert Raszuk &lt;robert@raszuk.net&gt;<br>
<b>Subject: </b>Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi, Acee, Les and Jeff: <o=
:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">IGP is used to transfer th=
e topology information within the domain, and the stub/passive interface is t=
he important part of one network, especially for the inter-AS topology.<o:p>=
</o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Currently, we have not fig=
ured out other use cases to distinguish other interfaces type. But for stub/=
passive interfaces, it will be useful to flooding such information to other i=
nternal routers.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A stub interface is not necessarily a passive interac=
e.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">OSPF has already the corre=
sponding consideration and specifications, isn=E2=80=99t it reasonable for I=
SIS to have such capabilities also?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">OSPF doesn=E2=80=99t advertise that an interface is a=
 passive interface. Others routing can=E2=80=99t distinguish a passive inter=
face from any other stub link.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Acee<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
<o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Aijun Wang <o:p></o:p></p>=

<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">China Telecom<o:p></o:p></=
p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
On Jan 14, 2020, at 02:41, Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt; wro=
te:<o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div name=3D"messageBodySection">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Agree with Acee and Les<o:=
p></o:p></p>
</div>
</div>
<div name=3D"messageSignatureSection">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Cheers, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Jeff<o:p></o:p></p>
</div>
</div>
</div>
<div name=3D"messageReplySection">
<p class=3D"MsoNormal" style=3D"margin-left:.5in">On Jan 13, 2020, 9:29 AM -=
0800, Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;, wrote:<br>
<br>
<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #1ABC9C 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
I agree with Acee that there is no requirement to identify an interface as p=
assive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or s=
tub=E2=80=A6<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
Before debating the best encoding for information, it would be sensible to d=
efine the use case/requirements.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
Simply having an advertisement that identifies an interface type isn=E2=80=99=
t sufficient to do anything useful IMO.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4=
.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
<b>From:</b> Acee Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Sent:</b> Monday, January 13, 2020 8:03 AM<br>
<b>To:</b> tony.li@tony.li; Aijun Wang &lt;wangaijun@tsinghua.org.cn&gt;<br>=

<b>Cc:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;; Robert Raszuk=
 &lt;robert@raszuk.net&gt;; lsr@ietf.org<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
Hi Aijun,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
I guess the external use case for this is advertisement in BGP-LS for Networ=
k Management purposes?? There really isn=E2=80=99t IS-IS requirement to know=
 whether or not an interface is a passive interface.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
Acee<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:.5in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
<b><span style=3D"font-size:12.0pt;color:black">From:</span></b> <span style=
=3D"font-size:12.0pt;color:black">
Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt;=
 on behalf of Tony Li &lt;<a href=3D"mailto:tony.li@tony.li">tony.li@tony.li=
</a>&gt;<br>
<b>Date:</b> Monday, January 13, 2020 at 11:00 AM<br>
<b>To:</b> Aijun Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn">wanga=
ijun@tsinghua.org.cn</a>&gt;<br>
<b>Cc:</b> "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto:ginsberg@cisco.co=
m">ginsberg@cisco.com</a>&gt;, Robert Raszuk &lt;<a href=3D"mailto:robert@ra=
szuk.net">robert@raszuk.net</a>&gt;, "<a href=3D"mailto:lsr@ietf.org">lsr@ie=
tf.org</a>" &lt;<a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Hi Anjun,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #E67E22 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
<span style=3D"font-size:10.5pt;color:#1F497D">Is it reasonable to put the l=
ink attribute information into the =E2=80=9CIP Reachability TLV=E2=80=9D?</s=
pan><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
<span style=3D"font-size:10.5pt;color:#1F497D">IMHO, such stub link is not t=
he normal links within IGP domain.&nbsp; Label the related prefix is coming f=
rom the passive/stub link seems also acceptable?</span><o:p></o:p></p>
</div>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Well, a passive interface is really configured so that you advertise the int=
erface=E2=80=99s prefix. &nbsp;Attaching the data that you want to the assoc=
iated data seems reasonable to me.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to b=
ecause there is no neighbor.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Tony<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">__________________________=
_____________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></p>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>


<span>_______________________________________________</span><br><span>Lsr ma=
iling list</span><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org=
/mailman/listinfo/lsr</span><br></div></blockquote></div></body></html>=

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
CC: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Methods to label the passive interfaces within ISIS
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Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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References: <2775D10C-CBD1-44EB-BBD8-8A3DD93AD5E9@cisco.com>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "tony.li@tony.li" <tony.li@tony.li>, Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
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To: "Acee Lindem (acee)" <acee@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/Za4tn7Knv7uI205fWLYjLmXHeKY>
Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
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Hi, Acee:
Actually, currently it arises from the inter-AS topology management needs. I=
t is not sufficient for BGP-LS to report only the interior connections infor=
mation.
To report the edge connection information, the router within the IGP domain t=
hat run BGP-LS needs first to distinguish the stub link from the normal link=
.
There maybe exists other usages for this information, we will add them if we=
 get it. Also welcome more examples/solutions from interested LSR experts.


Aijun Wang
China Telecom

> On Jan 14, 2020, at 07:06, Acee Lindem (acee) <acee@cisco.com> wrote:
>=20
> =EF=BB=BF
> Hi Aijun,
> =20
> From: Aijun Wang <wangaijun@tsinghua.org.cn>
> Date: Monday, January 13, 2020 at 5:48 PM
> To: Acee Lindem <acee@cisco.com>
> Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <gi=
nsberg@cisco.com>, Tony Li <tony.li@tony.li>, Robert Raszuk <robert@raszuk.n=
et>, "lsr@ietf.org" <lsr@ietf.org>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi, Acee:
> As Tony suggested also before, we can change the description for =E2=80=9C=
passive=E2=80=9D to =E2=80=9Cstub=E2=80=9D later.
> Is that more acceptable then?
> =20
> Yes =E2=80=93 but I=E2=80=99d still like to know why this is needed.
> =20
> Thanks,
> Acee
> =20
>=20
> Aijun Wang
> China Telecom
>=20
>=20
> On Jan 14, 2020, at 06:40, Acee Lindem (acee) <acee@cisco.com> wrote:
>=20
> Hi Aijun,
> =20
> From: Aijun Wang <wangaijun@tsinghua.org.cn>
> Date: Monday, January 13, 2020 at 5:37 PM
> To: Jeff Tantsura <jefftant.ietf@gmail.com>
> Cc: Acee Lindem <acee@cisco.com>, Tony Li <tony.li@tony.li>, "Les Ginsberg=
 (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Robert Ras=
zuk <robert@raszuk.net>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi, Acee, Les and Jeff:
> IGP is used to transfer the topology information within the domain, and th=
e stub/passive interface is the important part of one network, especially fo=
r the inter-AS topology.
> Currently, we have not figured out other use cases to distinguish other in=
terfaces type. But for stub/passive interfaces, it will be useful to floodin=
g such information to other internal routers.
> =20
> A stub interface is not necessarily a passive interace.
> =20
> OSPF has already the corresponding consideration and specifications, isn=E2=
=80=99t it reasonable for ISIS to have such capabilities also?
> =20
> OSPF doesn=E2=80=99t advertise that an interface is a passive interface. O=
thers routing can=E2=80=99t distinguish a passive interface from any other s=
tub link.
> =20
> Thanks,
> Acee
> =20
>=20
> Aijun Wang
> China Telecom
>=20
>=20
>=20
> On Jan 14, 2020, at 02:41, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
>=20
> Agree with Acee and Les
> =20
> Cheers,
> Jeff
> On Jan 13, 2020, 9:29 AM -0800, Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m>, wrote:
>=20
>=20
> I agree with Acee that there is no requirement to identify an interface as=
 passive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or=
 stub=E2=80=A6
> =20
> Before debating the best encoding for information, it would be sensible to=
 define the use case/requirements.
> Simply having an advertisement that identifies an interface type isn=E2=80=
=99t sufficient to do anything useful IMO.
> =20
>    Les
> =20
> From: Acee Lindem (acee) <acee@cisco.com>
> Sent: Monday, January 13, 2020 8:03 AM
> To: tony.li@tony.li; Aijun Wang <wangaijun@tsinghua.org.cn>
> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Robert Raszuk <robert@ra=
szuk.net>; lsr@ietf.org
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi Aijun,
> I guess the external use case for this is advertisement in BGP-LS for Netw=
ork Management purposes?? There really isn=E2=80=99t IS-IS requirement to kn=
ow whether or not an interface is a passive interface.
> Thanks,
> Acee
> =20
> From: Lsr <lsr-bounces@ietf.org> on behalf of Tony Li <tony.li@tony.li>
> Date: Monday, January 13, 2020 at 11:00 AM
> To: Aijun Wang <wangaijun@tsinghua.org.cn>
> Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert@=
raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> =20
> Hi Anjun,
> =20
> =20
>=20
> Is it reasonable to put the link attribute information into the =E2=80=9CI=
P Reachability TLV=E2=80=9D?
> IMHO, such stub link is not the normal links within IGP domain.  Label the=
 related prefix is coming from the passive/stub link seems also acceptable?
> =20
> =20
> Well, a passive interface is really configured so that you advertise the i=
nterface=E2=80=99s prefix.  Attaching the data that you want to the associat=
ed data seems reasonable to me.
> =20
> There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to=
 because there is no neighbor.
> =20
> Tony
> =20
> =20
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Acee:<div>Actually, currently it arises=
 from the inter-AS topology management needs. It is not sufficient for BGP-L=
S to report only the interior connections information.</div><div>To report t=
he edge connection information, the router within the IGP domain that run BG=
P-LS needs first to distinguish the stub link from the normal link.</div><di=
v>There maybe exists other usages for this information, we will add them if w=
e get it. Also welcome more examples/solutions from interested LSR experts.<=
/div><div><br><br><div dir=3D"ltr">Aijun Wang<div>China Telecom</div></div><=
div dir=3D"ltr"><br><blockquote type=3D"cite">On Jan 14, 2020, at 07:06, Ace=
e Lindem (acee) &lt;acee@cisco.com&gt; wrote:<br><br></blockquote></div><blo=
ckquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)">
<style><!--
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Aijun, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-siz=
e:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Aijun Wang &lt;wanga=
ijun@tsinghua.org.cn&gt;<br>
<b>Date: </b>Monday, January 13, 2020 at 5:48 PM<br>
<b>To: </b>Acee Lindem &lt;acee@cisco.com&gt;<br>
<b>Cc: </b>Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt;, "Les Ginsberg (gin=
sberg)" &lt;ginsberg@cisco.com&gt;, Tony Li &lt;tony.li@tony.li&gt;, Robert R=
aszuk &lt;robert@raszuk.net&gt;, "lsr@ietf.org" &lt;lsr@ietf.org&gt;<br>
<b>Subject: </b>Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi, Acee: <o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">As Tony suggested also bef=
ore, we can change the description for =E2=80=9Cpassive=E2=80=9D to =E2=80=9C=
stub=E2=80=9D later.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Is that more acceptable th=
en?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Yes =E2=80=93 but I=E2=80=99d still like to know why t=
his is needed. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Acee<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
<o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Aijun Wang <o:p></o:p></p>=

<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">China Telecom<o:p></o:p></=
p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
On Jan 14, 2020, at 06:40, Acee Lindem (acee) &lt;acee@cisco.com&gt; wrote:<=
o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi Aijun, <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Aijun Wang &lt;wanga=
ijun@tsinghua.org.cn&gt;<br>
<b>Date: </b>Monday, January 13, 2020 at 5:37 PM<br>
<b>To: </b>Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt;<br>
<b>Cc: </b>Acee Lindem &lt;acee@cisco.com&gt;, Tony Li &lt;tony.li@tony.li&g=
t;, "Les Ginsberg (ginsberg)" &lt;ginsberg@cisco.com&gt;, "lsr@ietf.org" &lt=
;lsr@ietf.org&gt;, Robert Raszuk &lt;robert@raszuk.net&gt;<br>
<b>Subject: </b>Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Hi, Acee, Les and Jeff: <=
o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">IGP is used to transfer t=
he topology information within the domain, and the stub/passive interface is=
 the important part of one network, especially for the inter-AS topology.<o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Currently, we have not fi=
gured out other use cases to distinguish other interfaces type. But for stub=
/passive interfaces, it will be useful to flooding such information to other=
 internal routers.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">A stub interface is not ne=
cessarily a passive interace.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">OSPF has already the corr=
esponding consideration and specifications, isn=E2=80=99t it reasonable for I=
SIS to have such capabilities also?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">OSPF doesn=E2=80=99t adver=
tise that an interface is a passive interface. Others routing can=E2=80=99t d=
istinguish a passive interface from any other stub link.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Acee<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Aijun Wang <o:p></o:p></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">China Telecom<o:p></o:p><=
/p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><br>
<br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
On Jan 14, 2020, at 02:41, Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt; wro=
te:<o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div name=3D"messageBodySection">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Agree with Acee and Les<o=
:p></o:p></p>
</div>
</div>
<div name=3D"messageSignatureSection">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Cheers, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Jeff<o:p></o:p></p>
</div>
</div>
</div>
<div name=3D"messageReplySection">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">On Jan 13, 2020, 9:29 AM -=
0800, Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;, wrote:<br>
<br>
<br>
<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #1ABC9C 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
I agree with Acee that there is no requirement to identify an interface as p=
assive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or s=
tub=E2=80=A6<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Before debating the best encoding for information, it would be sensible to d=
efine the use case/requirements.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Simply having an advertisement that identifies an interface type isn=E2=80=99=
t sufficient to do anything useful IMO.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4=
.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
<b>From:</b> Acee Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Sent:</b> Monday, January 13, 2020 8:03 AM<br>
<b>To:</b> tony.li@tony.li; Aijun Wang &lt;wangaijun@tsinghua.org.cn&gt;<br>=

<b>Cc:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;; Robert Raszuk=
 &lt;robert@raszuk.net&gt;; lsr@ietf.org<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Hi Aijun,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
I guess the external use case for this is advertisement in BGP-LS for Networ=
k Management purposes?? There really isn=E2=80=99t IS-IS requirement to know=
 whether or not an interface is a passive interface.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Acee<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<b><span style=3D"font-size:12.0pt;color:black">From:</span></b> <span style=
=3D"font-size:12.0pt;color:black">
Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt;=
 on behalf of Tony Li &lt;<a href=3D"mailto:tony.li@tony.li">tony.li@tony.li=
</a>&gt;<br>
<b>Date:</b> Monday, January 13, 2020 at 11:00 AM<br>
<b>To:</b> Aijun Wang &lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn">wanga=
ijun@tsinghua.org.cn</a>&gt;<br>
<b>Cc:</b> "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto:ginsberg@cisco.co=
m">ginsberg@cisco.com</a>&gt;, Robert Raszuk &lt;<a href=3D"mailto:robert@ra=
szuk.net">robert@raszuk.net</a>&gt;, "<a href=3D"mailto:lsr@ietf.org">lsr@ie=
tf.org</a>" &lt;<a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Hi Anjun,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #E67E22 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<span style=3D"font-size:10.5pt;color:#1F497D">Is it reasonable to put the l=
ink attribute information into the =E2=80=9CIP Reachability TLV=E2=80=9D?</s=
pan><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<span style=3D"font-size:10.5pt;color:#1F497D">IMHO, such stub link is not t=
he normal links within IGP domain.&nbsp; Label the related prefix is coming f=
rom the passive/stub link seems also acceptable?</span><o:p></o:p></p>
</div>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Well, a passive interface is really configured so that you advertise the int=
erface=E2=80=99s prefix. &nbsp;Attaching the data that you want to the assoc=
iated data seems reasonable to me.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to b=
ecause there is no neighbor.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Tony<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">_________________________=
______________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></p>
</blockquote>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">__________________________=
_____________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></p>
</div>
</blockquote>
</div>
</div>


</div></blockquote></div></body></html>=

--Apple-Mail-E12C2098-FB83-415B-8BC9-A551BB0C0C3A--


From nobody Wed Jan 15 05:52:51 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IS-IS Extension to Support Segment Routing over IPv6 Dataplane
        Authors         : Peter Psenak
                          Clarence Filsfils
                          Ahmed Bashandy
                          Bruno Decraene
                          Zhibo Hu
	Filename        : draft-ietf-lsr-isis-srv6-extensions-04.txt
	Pages           : 25
	Date            : 2020-01-15

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  Segment routing architecture can be implemented over an
   MPLS data plane as well as an IPv6 data plane.  This draft describes
   the IS-IS extensions required to support Segment Routing over an IPv6
   data plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Wed Jan 15 06:00:02 2020
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-04.txt
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Hi LSR Chairs,

as requested in Singapore, I have added the "Implementation Status" 
section to the draft. The new version also includes bunch of editorial 
changes.

I would like to request a WG last call for this document.

thanks,
Peter


On 15/01/2020 14:52, internet-drafts@ietf.org wrote:
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Link State Routing WG of the IETF.
> 
>          Title           : IS-IS Extension to Support Segment Routing over IPv6 Dataplane
>          Authors         : Peter Psenak
>                            Clarence Filsfils
>                            Ahmed Bashandy
>                            Bruno Decraene
>                            Zhibo Hu
> 	Filename        : draft-ietf-lsr-isis-srv6-extensions-04.txt
> 	Pages           : 25
> 	Date            : 2020-01-15
> 
> Abstract:
>     Segment Routing (SR) allows for a flexible definition of end-to-end
>     paths by encoding paths as sequences of topological sub-paths, called
>     "segments".  Segment routing architecture can be implemented over an
>     MPLS data plane as well as an IPv6 data plane.  This draft describes
>     the IS-IS extensions required to support Segment Routing over an IPv6
>     data plane.
> 
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04
> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-04
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-04
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 
> 


From nobody Wed Jan 15 07:20:41 2020
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Lizhenbin <lizhenbin@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, "draft-li-ospf-ospfv3-srv6-extensions@ietf.org" <draft-li-ospf-ospfv3-srv6-extensions@ietf.org>
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Date: Wed, 15 Jan 2020 15:19:48 +0000
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Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-invalid-tlv-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Invalid TLV Handling in IS-IS
        Authors         : Les Ginsberg
                          Paul Wells
                          Tony Li
                          Tony Przygienda
                          Shraddha Hegde
	Filename        : draft-ietf-lsr-isis-invalid-tlv-01.txt
	Pages           : 8
	Date            : 2020-01-15

Abstract:
   Key to the extensibility of the Intermediate System to Intermediate
   System (IS-IS) protocol has been the handling of unsupported and/or
   invalid Type/Length/Value (TLV) tuples.  Although there are explicit
   statements in existing specifications, deployment experience has
   shown that there are inconsistencies in the behavior when a TLV which
   is disallowed in a particular Protocol Data Unit (PDU) is received.

   This document discusses such cases and makes the correct behavior
   explicit in order to insure that interoperability is maximized.

   This document when approved updates RFC3563, RFC5305, RFC6232, and
   RFC6233.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-invalid-tlv-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-invalid-tlv-01


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until the htmlized version and diff are available at tools.ietf.org.

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] I-D Action: draft-ietf-lsr-isis-invalid-tlv-01.txt
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Date: Wed, 15 Jan 2020 15:47:54 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/S7k97uNDWaVOPIPricSxJ5qKmoY>
Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-isis-invalid-tlv-01.txt
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Folks -

Just a refresh as the draft was about to expire.

   Les


> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
> Sent: Wednesday, January 15, 2020 7:45 AM
> To: i-d-announce@ietf.org
> Cc: lsr@ietf.org
> Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-invalid-tlv-01.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Link State Routing WG of the IETF.
>=20
>         Title           : Invalid TLV Handling in IS-IS
>         Authors         : Les Ginsberg
>                           Paul Wells
>                           Tony Li
>                           Tony Przygienda
>                           Shraddha Hegde
> 	Filename        : draft-ietf-lsr-isis-invalid-tlv-01.txt
> 	Pages           : 8
> 	Date            : 2020-01-15
>=20
> Abstract:
>    Key to the extensibility of the Intermediate System to Intermediate
>    System (IS-IS) protocol has been the handling of unsupported and/or
>    invalid Type/Length/Value (TLV) tuples.  Although there are explicit
>    statements in existing specifications, deployment experience has
>    shown that there are inconsistencies in the behavior when a TLV which
>    is disallowed in a particular Protocol Data Unit (PDU) is received.
>=20
>    This document discusses such cases and makes the correct behavior
>    explicit in order to insure that interoperability is maximized.
>=20
>    This document when approved updates RFC3563, RFC5305, RFC6232, and
>    RFC6233.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-lsr-isis-invalid-tlv-01
> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-invalid-tlv-01
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsr-isis-invalid-tlv-01
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>,  "draft-ietf-isis-te-app@ietf.org" <draft-ietf-isis-te-app@ietf.org>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-te-app-09
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On January 15, 2020 at 3:48:31 PM, Les Ginsberg wrote:

Les:

Hi!

...
> 5. Deployment Considerations
> 6. Attribute Advertisements and Enablement
> 7. Interoperability, Backwards Compatibility and Migration
> Concerns
>
> Of these I think 5 and 7 could logically be combined and fall under the
> heading of "Deployment Considerations".
>
> Section 6 is discussing a particular aspect of the protocol extensions - =
what
> the advertisement of link attributes associated with a particular applica=
tion
> says about the state of that application on that link. This isn't a
> deployment consideration.
>
> I therefore suggest that Section 6 remain as is but be placed BEFORE a ne=
w
> Deployment Considerations section which will have the combined content of=
 the
> current Sections 5 and 7 - plus revisions based on your comments.
>
> Let me know if that makes sense to you.

Yes, that works for me.



> > [c] The OSPF abstract is more general, while this one provides more
> > specifics...
>
> [Les:] And which style do you prefer?


Most of the time I prefer the general approach.

In this case either works for me. =C2=A0I would simply want to avoid
questions about what may look like different
scope/goals/functionality...

Thanks!

Alvaro.


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From: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>
To: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com>, Antoni Przygienda <prz@juniper.net>, "aldrin.ietf@gmail.com" <aldrin.ietf@gmail.com>, "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
CC: dongjiajia <dongjiajia@huawei.com>, BIER WG <bier@ietf.org>, Liangyanrong <liangyanrong@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: RFC8401 - Question on BIER TLV leaking from one level to the other
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Date: Thu, 16 Jan 2020 10:52:13 +0000
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Subject: Re: [Lsr] RFC8401 - Question on BIER TLV leaking from one level to the other
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From nobody Thu Jan 16 02:58:32 2020
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From: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com>
CC: dongjiajia <dongjiajia@huawei.com>, BIER WG <bier@ietf.org>, Liangyanrong <liangyanrong@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: RFC8401 - Question on BIER TLV leaking from one level to the other
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Date: Thu, 16 Jan 2020 10:58:18 +0000
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Subject: Re: [Lsr] RFC8401 - Question on BIER TLV leaking from one level to the other
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>, Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com>
CC: dongjiajia <dongjiajia@huawei.com>, BIER WG <bier@ietf.org>, Liangyanrong <liangyanrong@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: RFC8401 - Question on BIER TLV leaking from one level to the other
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Subject: Re: [Lsr] RFC8401 - Question on BIER TLV leaking from one level to the other
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From nobody Fri Jan 17 01:19:58 2020
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From: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Senthil Dhanaraj <senthil.dhanaraj.ietf@gmail.com>
CC: dongjiajia <dongjiajia@huawei.com>, BIER WG <bier@ietf.org>, Liangyanrong <liangyanrong@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: RFC8401 - Question on BIER TLV leaking from one level to the other
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Date: Fri, 17 Jan 2020 09:19:42 +0000
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Subject: Re: [Lsr] RFC8401 - Question on BIER TLV leaking from one level to the other
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--_000_ad38af3d42f24b259e400e711a596df5huaweicom_--


From nobody Sun Jan 19 00:54:48 2020
Return-Path: <liu.yao71@zte.com.cn>
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Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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This begins a 2 week WG Last Call, ending after Feb 4, 2020, for =
draft-ietf-lsr-isis-srv6-extensions

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

Authors please indicate if you aware of any other IPR beyond what is =
posted:

  https://datatracker.ietf.org/ipr/3796/

Thanks,
Chris & Acee.=


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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-invalid-tlv
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The WG Last Call has completed successfully, and the document will be =
submitted to IESG after the shepherd finishes the write-up.

Thanks,
Chris.

> On Jan 2, 2020, at 2:06 PM, Christian Hopps <chopps@chopps.org> wrote:
>=20
> This begins a 2 week WG Last Call, ending after Jan 16th, 2020, for =
draft-ietf-lsr-isis-invalid-tlv.
>=20
>  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/
>=20
> Tony P (other authors already responded during the adoption poll), =
please indicate your knowledge of any IPR related to this work to the =
list as well.
>=20
> Thanks,
> Chris & Acee.
>=20
> _______________________________________________
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Hi Chris,

On 22/01/2020 01:14, Christian Hopps wrote:
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions >
>    https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
> 
> Authors please indicate if you aware of any other IPR beyond what is posted:
> 
>    https://datatracker.ietf.org/ipr/3796/

I'm not aware of any other IPRs beyond what is posted.

thanks,
Peter
> 
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 
> 


From nobody Wed Jan 22 01:31:37 2020
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To: Christian Hopps <chopps@chopps.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Chris,

I'm not aware of non-disclosed IPR.

Regards,
--Bruno
-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Wednesday, January 22, 2020 1:15 AM
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

Authors please indicate if you aware of any other IPR beyond what is posted:

  https://datatracker.ietf.org/ipr/3796/

Thanks,
Chris & Acee.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
______________________________________________

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From nobody Wed Jan 22 05:45:54 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-yang-isis-reverse-metric-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : YANG Module for IS-IS Reverse Metric
        Author          : Christian Hopps
	Filename        : draft-ietf-lsr-yang-isis-reverse-metric-00.txt
	Pages           : 13
	Date            : 2020-01-22

Abstract:
   This document defines a YANG module for managing the reverse metric
   extension to the the intermediate system to intermediate system
   routeing protocol.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-yang-isis-reverse-metric/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-yang-isis-reverse-metric-00
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-yang-isis-reverse-metric-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>
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From nobody Thu Jan 23 12:19:09 2020
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From: IETF Secretariat <ietf-secretariat-reply@ietf.org>
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Subject: [Lsr] The LSR WG has placed draft-li-lsr-ospfv3-srv6-extensions in state "Call For Adoption By WG Issued"
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The LSR WG has placed draft-li-lsr-ospfv3-srv6-extensions in state
Call For Adoption By WG Issued (entered by Christian Hopps)

The document is available at
https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/


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From: Christian Hopps <chopps@chopps.org>
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Date: Thu, 23 Jan 2020 15:24:36 -0500
Cc: Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>, lsr-ads@ietf.org, draft-li-lsr-ospfv3-srv6-extensions@ietf.org
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Subject: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hi LSR WG and Draft Authors,

The authors originally requested adoption back @ 105; however, some =
comments were received and new version was produced. Moving forward...

This begins a 2 week WG adoption poll for the following draft:

  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
=20
Please indicate your support or objection by Feb 6, 2020.

Authors, please respond indicating whether you are aware of any IPR that =
applies to this draft.

Thanks,
Chris & Acee.=


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From: "Mankamana Mishra (mankamis)" <mankamis@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Paul Wells (pauwells)" <pauwells@cisco.com>, "chopps@chopps.org" <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Support. As a contributor, I am not aware of any undisclosed IPR related to=
 this draft.

Thanks,
Ketan

-----Original Message-----
From: Lsr <lsr-bounces@ietf.org> On Behalf Of Paul Wells (pauwells)
Sent: 24 January 2020 06:10
To: chopps@chopps.org; lsr@ietf.org
Cc: lsr-ads@ietf.org; Acee Lindem (acee) <acee@cisco.com>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

Support. Not aware of any undisclosed IPR.

Paul

On Tue, 2020-01-21 at 19:14 -0500, Christian Hopps wrote:
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ie=
tf-lsr-isis-srv6-extensions
>=20
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
>=20
> Authors please indicate if you aware of any other IPR beyond what is post=
ed:
>=20
>   https://datatracker.ietf.org/ipr/3796/
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20
_______________________________________________
Lsr mailing list
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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
Thread-Index: AQHV0isvF53H3sWQPUmxK1VAQojDh6f5coOA
Date: Fri, 24 Jan 2020 12:53:55 +0000
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: stefano previdi <stefano@previdi.net>
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Date: Fri, 24 Jan 2020 14:46:31 +0100
Cc: lsr@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" <acee@cisco.com>
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To: Christian Hopps <chopps@chopps.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/eK0NhVhlQVLaQxNrgXdtyZV9_-s>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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As contributor, I do support the draft and I=E2=80=99m not aware of any =
undisclosed IPR.

Thanks.
s.



> On Jan 22, 2020, at 1:14 AM, Christian Hopps <chopps@chopps.org> =
wrote:
>=20
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for =
draft-ietf-lsr-isis-srv6-extensions
>=20
>  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
>=20
> Authors please indicate if you aware of any other IPR beyond what is =
posted:
>=20
>  https://datatracker.ietf.org/ipr/3796/
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Support.



Best Regards,

Huaimo



From: Lsr <lsr-bounces@ietf.org> on behalf of Christian Hopps <chopps@chopp=
s.org>
Date: Thursday, January 23, 2020 at 3:25 PM
To: "lsr@ietf.org" <lsr@ietf.org>
Cc: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv=
6-extensions@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Christian Ho=
pps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Subject: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions



Hi LSR WG and Draft Authors,



The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...



This begins a 2 week WG adoption poll for the following draft:



  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/<htt=
ps://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracke=
r.ietf.org%2Fdoc%2Fdraft-li-lsr-ospfv3-srv6-extensions%2F&data=3D02%7C01%7C=
huaimo.chen%40futurewei.com%7Cec9fda41c1404d9bf37d08d7a0cc8245%7C0fee8ff2a3=
b240189c753a1d5591fedc%7C1%7C0%7C637154672551852584&sdata=3DZi4mWecNx8oBAgO=
CL3J4KwsbZ7f6wK%2F7dC7jOmuW0%2Fc%3D&reserved=3D0>

Please indicate your support or objection by Feb 6, 2020.



Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.



Thanks,

Chris & Acee.

_______________________________________________

Lsr mailing list

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

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<span style=3D"font-family: Calibri, sans-serif; font-size: 11pt;">Support.=
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<div lang=3D"EN-US">
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&nbsp;</p>
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<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
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Best Regards,</p>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
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Huaimo</p>
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&nbsp;</p>
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n 0in 0in">
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
<b><span style=3D"font-size:12.0pt; color:black">From: </span></b><span sty=
le=3D"font-size:12.0pt; color:black">Lsr &lt;lsr-bounces@ietf.org&gt; on be=
half of Christian Hopps &lt;chopps@chopps.org&gt;<br>
<b>Date: </b>Thursday, January 23, 2020 at 3:25 PM<br>
<b>To: </b>&quot;lsr@ietf.org&quot; &lt;lsr@ietf.org&gt;<br>
<b>Cc: </b>&quot;draft-li-lsr-ospfv3-srv6-extensions@ietf.org&quot; &lt;dra=
ft-li-lsr-ospfv3-srv6-extensions@ietf.org&gt;, &quot;lsr-ads@ietf.org&quot;=
 &lt;lsr-ads@ietf.org&gt;, Christian Hopps &lt;chopps@chopps.org&gt;, &quot=
;Acee Lindem (acee)&quot; &lt;acee@cisco.com&gt;<br>
<b>Subject: </b>[Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensi=
ons</span></p>
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<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Hi LSR WG and Draft Authors,</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
This begins a 2 week WG adoption poll for the following draft:</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;&nbsp;<a href=3D"https://nam03.safelinks.protection.outlook.com/?url=
=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-li-lsr-ospfv3-srv6-exte=
nsions%2F&amp;data=3D02%7C01%7Chuaimo.chen%40futurewei.com%7Cec9fda41c1404d=
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jpCogjIfWtUHftSg7z64bwBfgjTK1K4cG6Myg5jbZaJsn&#43;Bmzrw4i/NZPLqS/1jo5Ho=3D"=
>https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/</a><=
/p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Please indicate your support or objection by Feb 6, 2020.</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
&nbsp;</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Thanks,</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Chris &amp; Acee.</p>
</div>
<div>
<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
_______________________________________________</p>
</div>
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<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;">
Lsr mailing list</p>
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<a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a></p>
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<p class=3D"x_MsoNormal" style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt=
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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Christian Hopps <chopps@chopps.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Support.

Best Regards,
Huaimo

> On Jan 22, 2020, at 1:14 AM, Christian Hopps <chopps@chopps.org> wrote:
>
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ie=
tf-lsr-isis-srv6-extensions
>
>  https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-ietf-lsr-isis-srv6-extensions%2F&amp;data=3D=
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>
> Authors please indicate if you aware of any other IPR beyond what is post=
ed:
>
>  https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fipr%2F3796%2F&amp;data=3D02%7C01%7Chuaimo.chen%40futurew=
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>
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
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<div class=3D"PlainText">Best Regards,</div>
<div class=3D"PlainText">Huaimo<br>
<br>
&gt; On Jan 22, 2020, at 1:14 AM, Christian Hopps &lt;chopps@chopps.org&gt;=
 wrote:<br>
&gt; <br>
&gt; This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft=
-ietf-lsr-isis-srv6-extensions<br>
&gt; <br>
&gt;&nbsp; <a href=3D"https://nam03.safelinks.protection.outlook.com/?url=
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From: Huzhibo <huzhibo@huawei.com>
To: Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Date: Fri, 24 Jan 2020 15:14:04 +0000
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support.

From:Christian Hopps <chopps@chopps.org>
To:lsr <lsr@ietf.org>
Cc:lsr-ads <lsr-ads@ietf.org>;Christian Hopps <chopps@chopps.org>;Acee Lind=
em (acee) <acee@cisco.com>
Date:2020-01-22 08:15:24
Subject:[Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

Authors please indicate if you aware of any other IPR beyond what is posted=
:

  https://datatracker.ietf.org/ipr/3796/

Thanks,
Chris & Acee.
_______________________________________________
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<div style=3D"word-break:break-all"><b>From:</b>Christian Hopps &lt;chopps@=
chopps.org&gt;</div>
<div style=3D"word-break:break-all"><b>To:</b>lsr &lt;lsr@ietf.org&gt;</div=
>
<div style=3D"word-break:break-all"><b>Cc:</b>lsr-ads &lt;lsr-ads@ietf.org&=
gt;;Christian Hopps &lt;chopps@chopps.org&gt;;Acee Lindem (acee) &lt;acee@c=
isco.com&gt;</div>
<div style=3D"word-break:break-all"><b>Date:</b>2020-01-22 08:15:24</div>
<div style=3D"word-break:break-all"><b>Subject:</b>[Lsr] WG Last Call draft=
-ietf-lsr-isis-srv6-extensions</div>
<div><br>
</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">This begins a 2 week WG Last Call, ending after Fe=
b 4, 2020, for draft-ietf-lsr-isis-srv6-extensions<br>
<br>
&nbsp; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6=
-extensions/">
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a><b=
r>
<br>
Authors please indicate if you aware of any other IPR beyond what is posted=
:<br>
<br>
&nbsp; <a href=3D"https://datatracker.ietf.org/ipr/3796/">https://datatrack=
er.ietf.org/ipr/3796/</a><br>
<br>
Thanks,<br>
Chris &amp; Acee.<br>
_______________________________________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/=
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From: "Xiejingrong (Jingrong)" <xiejingrong@huawei.com>
To: Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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support.

From:Christian Hopps <chopps@chopps.org>
To:lsr <lsr@ietf.org>
Cc:draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions=
@ietf.org>;lsr-ads <lsr-ads@ietf.org>;Christian Hopps <chopps@chopps.org>;A=
cee Lindem (acee) <acee@cisco.com>
Date:2020-01-24 04:25:11
Subject:[Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions

Hi LSR WG and Draft Authors,

The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...

This begins a 2 week WG adoption poll for the following draft:

  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/

Please indicate your support or objection by Feb 6, 2020.

Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.

Thanks,
Chris & Acee.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

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<div style=3D"word-break:break-all"><b>From:</b>Christian Hopps &lt;chopps@=
chopps.org&gt;</div>
<div style=3D"word-break:break-all"><b>To:</b>lsr &lt;lsr@ietf.org&gt;</div=
>
<div style=3D"word-break:break-all"><b>Cc:</b>draft-li-lsr-ospfv3-srv6-exte=
nsions &lt;draft-li-lsr-ospfv3-srv6-extensions@ietf.org&gt;;lsr-ads &lt;lsr=
-ads@ietf.org&gt;;Christian Hopps &lt;chopps@chopps.org&gt;;Acee Lindem (ac=
ee) &lt;acee@cisco.com&gt;</div>
<div style=3D"word-break:break-all"><b>Date:</b>2020-01-24 04:25:11</div>
<div style=3D"word-break:break-all"><b>Subject:</b>[Lsr] WG Adoption Call f=
or draft-li-lsr-ospfv3-srv6-extensions</div>
<div><br>
</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">Hi LSR WG and Draft Authors,<br>
<br>
The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...<br>
<br>
This begins a 2 week WG adoption poll for the following draft:<br>
<br>
&nbsp; <a href=3D"https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6=
-extensions/">
https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/</a><b=
r>
&nbsp;<br>
Please indicate your support or objection by Feb 6, 2020.<br>
<br>
Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.<br>
<br>
Thanks,<br>
Chris &amp; Acee.<br>
_______________________________________________<br>
Lsr mailing list<br>
Lsr@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/=
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Hi authors, WG,



I've re-read the draft. Please find below some minor comments and nits.



Best regards,

--Bruno



Minors:

=3D=3D=3D=3D=3D=3D

" A node indicates that it has support for SRv6 by advertising a new SRv6 C=
apabilities sub-TLV"

I'm not completely certain that "support for SRv6" is perfectly defined. Do=
 you have a reference? Otherwise may be "is an SRv6 Segment Endpoint Node" =
would be better.

Cf https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-3



---

=A74.3

"The Maximum H.Encaps MSD Type specifies the maximum number of SIDs  that c=
an be included as part of the "H.Encaps" behavior"



This is not crystal clear to me when the "reduced encapsulation" is used. I=
n such case we have:

a) the number of SID included (N)

b) the number of SID included in the SRH (N-1)



Could you clarify which one you are referring to?



I assume that this is "b" given the text:

"If the advertised value is zero then the router can apply H.Encaps only by=
 encapsulating the incoming packet in another  IPv6 header without SRH the =
same way IPinIP encapsulation is performed."

But to avoid interop issue, I'd prefer the spec to be non ambiguous. (typic=
ally by saying "SIDs in a SRH" as indicated in =A74.4



---

=A74.2

"in  the top SRH in an SRH stack to which the router can apply "PSP" or  US=
P" as defined in [I-D.ietf-spring-srv6-network-programming]  flavors"



[I-D.ietf-spring-srv6-network-programming] does not define (anymore) "SRH s=
tack", nor "top SRH". Please remove those two terms.



---

=A74.4



"      If the advertised value is zero or no value is advertised

      then it is assumed that the router cannot apply

      "End.DX6" or "End.DT6" behaviors if the extension

      header right underneath the outer IPv6 header is an SRH."



There is no requirement for the SRH to be "right underneath the outer IPv6 =
header".

Cf https://tools.ietf.org/html/rfc8200#section-4.1



Please clarify what is meant precisely. E.g.:

a) if there is an SRH

b) if there is a IPv6 routing header

c) if there is  an IPv6 extension header

?

....



Given the wording in =A74.2, I would suggest "a". However, the technical qu=
estion remains: are those MSD numbers affected by the presence of another I=
Pv6 extension header (before the SRH)?



---

OLD: This is to prevent inconsistent forwarding entries on SRv6 capable/SRv=
6 incapable routers.





I think the below would be clearer

NEW: This is to prevent inconsistent forwarding entries between SRv6 capabl=
e and SRv6 incapable routers.



----

=A77.1



"

     Type: 27 (Suggested value to be assigned by IANA)



     Length: variable.



     MTID: Multitopology Identifier as defined in [RFC5120<https://tools.ie=
tf.org/html/rfc5120>].

     Note that the value 0 is legal."



Personally I would find clearer to move the above text (describing the SRv6=
 Locator TLV) just after the Figure of the SRv6 Locator TLV.



That would also allow the removal of "Locator entry:" since as a result the=
 text and figures for the local entry would also be grouped together.



----

=A77.1

"Loc-Size: 1 octet. Number of bits in the Locator field."



I think that this is the number of bits of the SRv6 Locator, rather than th=
e number of bits of the field.



Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.



"The Locator is encoded in the minimal number of  octets for the given numb=
er of bits."

Do we want to define the trailing bits? E.g. MUST be sent as zero and ignor=
ed when received.



----

=A78.1 (idem for =A78.2)

I may be missing something...



"All End.X SIDs MUST be a subnet of a Locator with matching topology
   and algorithm which is advertised by the same node in an SRv6 Locator
   TLV. =BB


OK.

So what's the point of advertising a field 'algorithm' in the SRv6 End.X SI=
D sub-TLV? The 128-bits SID allows identifying the Locator, which already a=
dvertise an algorithm.

Advertising again the algorithm with the End.X SID waste space and is an op=
portunity for inconsistency hence additional error handling rules/implement=
ations.



----

=A78.2

"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589<https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-=
04#ref-ISO10589>]. =BB



The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).



----

=A79

A priori the sum of all 4 sizes must be 128 bits. Could you specify the err=
or handling when this is not the case? (a choice could be to ignore this Su=
b-Sub-TLV; but given the error handling specified for another error, you se=
em to prefer to ignore the whole parent TLV.

----

=A79

"ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
   its parent sub-TLV.  If it appears more than once in its parent TLV,
   the parent TLV MUST be ignored by the receiver."



In the first sentence, 'parent" refers to the sub-TLV.

In the second sentence, 'parent" refers to the TLV.

I assume that the second sentence should also refers to the parent 'sub-TLV=
' but I'd prefer this be clarified in the text.

----

=A712.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TL=
V"

=A712.5 defines a new IANA registry "Sub-Sub-TLVs for SID Sub-TLVs"



Just checking whether both are needed/intended especially as the second ref=
erences section 7.2. (SRv6 End SID sub-TLV)



Nits:

=3D=3D=3D=3D=3D=3D

Idnits reports 1 error & 1 warning that seem valid : https://tools.ietf.org=
/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions=
-04.txt

---

Page header is " draft-bashandy-isis-srv6-extensions". Probably a better na=
me could be found for the RFC. E.g. IS-IS extensions for SRv6.

---

Proposed

OLD:  a combination of SID's

NEW: a combination of SIDs

---

OLD: is received in both in a

NEW: is received in both a

--

OLD: the this draft

NEW: this draft







-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Wednesday, January 22, 2020 1:15 AM
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions



This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions



  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/



Authors please indicate if you aware of any other IPR beyond what is posted:



  https://datatracker.ietf.org/ipr/3796/



Thanks,

Chris & Acee.

_______________________________________________

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https://www.ietf.org/mailman/listinfo/lsr

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<body lang=3D"FR" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:35.4=
pt">
<div class=3D"WordSection1">
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Hi authors, WG,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">I've re-read the draft. Please find below some minor comments and nit=
s.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Minors:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">&quot; A node indicates that it has support for SRv6 by advertising a=
 new SRv6 Capabilities sub-TLV&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">I'm not completely certain that &quot;support for SRv6&quot; is perfe=
ctly defined. Do you have a reference? Otherwise may be &quot;is an SRv6 Se=
gment Endpoint Node&quot; would be better.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span class=3D"SpellE"><span lang=3D"EN-US" style=
=3D"mso-ansi-language:EN-US">Cf</span></span><span lang=3D"EN-US" style=3D"=
mso-ansi-language:EN-US">
<a href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-head=
er-26#section-3">
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-3</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">=A74.3<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">&quot;The Maximum
<span class=3D"SpellE">H.Encaps</span> MSD Type specifies the maximum numbe=
r of SIDs<span style=3D"mso-spacerun:yes">&nbsp;
</span>that can be included as part of the &quot;<span class=3D"SpellE">H.E=
ncaps</span>&quot; behavior&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">This is not crystal clear to me when the &quot;reduced encapsulation&=
quot; is used. In such case we have:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">a) the number of SID included (N)<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">b) the number of SID included in the SRH (N-1)<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Could you clarify which one you are referring to?<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">I assume that this is &quot;b&quot; given the text:<o:p></o:p></span>=
</p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">&quot;If the advertised value is zero then the router can apply
<span class=3D"SpellE">H.Encaps</span> only by encapsulating the incoming p=
acket in another<span style=3D"mso-spacerun:yes">&nbsp;
</span>IPv6 header without SRH the same way <span class=3D"SpellE">IPinIP</=
span> encapsulation is performed.&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">But to avoid interop issue, I'd prefer the spec to be
<span class=3D"SpellE">non ambiguous</span>. (typically by saying &quot;SID=
s in a SRH&quot; as indicated in =A74.4<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">=A74.2<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">&quot;in<span style=3D"mso-spacerun:yes">&nbsp;
</span>the top SRH in an SRH stack to which the router can apply &quot;PSP&=
quot; or<span style=3D"mso-spacerun:yes">&nbsp;
</span>USP&quot; as defined in [I-D.ietf-spring-srv6-network-programming]<s=
pan style=3D"mso-spacerun:yes">&nbsp;
</span>flavors&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">[I-D.ietf-spring-srv6-network-programming] does not define (anymore) =
&quot;SRH stack&quot;, nor &quot;top SRH&quot;. Please remove those two ter=
ms.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">=A74.4<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">&quot;<span style=3D"mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>If the advertised value is zero or no value is advertised<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><span style=3D"mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>then it is assumed that the router cannot apply<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><span style=3D"mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>&quot;End.DX6&quot; or &quot;End.DT6&quot; behaviors if the extensio=
n<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><span style=3D"mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>header right underneath the outer IPv6 header is an SRH.&quot;<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">There is no requirement for the SRH to be &quot;right underneath the =
outer IPv6 header&quot;.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span class=3D"SpellE"><span lang=3D"EN-US" style=
=3D"mso-ansi-language:EN-US">Cf</span></span><span lang=3D"EN-US" style=3D"=
mso-ansi-language:EN-US">
<a href=3D"https://tools.ietf.org/html/rfc8200#section-4.1">https://tools.i=
etf.org/html/rfc8200#section-4.1</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Please clarify what is meant precisely. E.g.:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">a) if there is an SRH<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">b) if there is a IPv6 routing header<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">c) if there is<span style=3D"mso-spacerun:yes">&nbsp;
</span>an IPv6 extension header<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">....<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Given the wording in =A74.2, I would suggest &quot;a&quot;. However, =
the technical question remains: are those MSD numbers affected by the prese=
nce of another IPv6 extension header (before the SRH)?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">OLD: This is to prevent inconsistent forwarding entries on SRv6 capab=
le/SRv6 incapable routers.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">I think the below would be clearer<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">NEW: This is to prevent inconsistent forwarding entries between SRv6 =
capable and SRv6 incapable routers.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A77.1<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"mso-bidi-font-family:Calibri;mso-ansi-la=
nguage:EN-US">&#8220;</span><span lang=3D"EN-US" style=3D"mso-ansi-language=
:EN-US"><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp; </span>Type: 27 (Suggested value=
 to be assigned by IANA)<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp; </span>Length: variable.<o:p></o=
:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp; </span>MTID: <span class=3D"Spel=
lE">Multitopology</span> Identifier as defined in [</span><a href=3D"https:=
//tools.ietf.org/html/rfc5120" title=3D"&quot;M-ISIS: Multi Topology (MT) R=
outing in Intermediate System to Intermediate Systems (IS-ISs)&quot;"><span=
 lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">RFC5120</span></a><span l=
ang=3D"EN-US" style=3D"mso-ansi-language:EN-US">].<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><span style=3D"=
mso-spacerun:yes">&nbsp;&nbsp;&nbsp;&nbsp; </span>Note that the value 0 is =
legal.&#8221;<o:p></o:p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Personally I would find clearer to move the above text (describing th=
e SRv6 Locator TLV) just after the Figure of the SRv6 Locator TLV.<o:p></o:=
p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">That would also allow the removal of &#8220;Locator entry:&#8221; sin=
ce as a result the text and figures for the local entry would also be group=
ed together.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"mso-bidi-font-family:Calibri;mso-ansi-la=
nguage:EN-US">=A77.1<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-bidi-font-family:Calibri;mso-ansi-la=
nguage:EN-US">&#8220;</span><span class=3D"SpellE"><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US">Loc</span></span><span lang=3D"EN-US" style=
=3D"mso-ansi-language:EN-US">-Size: 1 octet. Number of bits in the Locator =
field.&#8221;<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">I think that this is the number of bits of the SRv6 Locator, rather t=
han the number of bits of the field.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Proposed NEW:
<span class=3D"SpellE">Loc</span>-Size: 1 octet. Number of bits in the SRv6=
 Locator.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">&#8220;The Locator is encoded in the min=
imal number of<span style=3D"mso-spacerun:yes">&nbsp;
</span>octets for the given number of bits.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">Do we want to define the trailing bits? =
E.g. MUST be sent as zero and ignored when received.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A78.1 (idem for =A78.2)<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">I may be missing something&#8230;<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"mso-bidi-font-family:Calibri;mso-ansi-la=
nguage:EN-US">&#8220;</span><span lang=3D"EN-US" style=3D"mso-ansi-language=
:EN-US">All <span class=3D"SpellE">End.X</span> SIDs MUST be a subnet of a =
Locator with matching topology<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>and algorithm which is advertised by the same node in an SRv6 Locato=
r<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span></span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-fareast-lang=
uage:FR">TLV.&nbsp;=BB<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-far=
east-font-family:&quot;Times New Roman&quot;;mso-fareast-language:FR"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">OK.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">So what&#8217;s the point of advertising=
 a field &#8216;algorithm&#8217; in the SRv6
<span class=3D"SpellE">End.X</span> SID sub-TLV? The 128-bits SID allows id=
entifying the Locator, which already advertise an algorithm.<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">Advertising again the algorithm with the
<span class=3D"SpellE">End.X</span> SID waste space and is an opportunity f=
or inconsistency hence additional error handling rules/implementations.<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A78.2<o:p></o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">&#8220;System-I=
D: 6 octets of IS-IS System-ID of length &quot;ID Length&quot; as defined i=
n [</span><a href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-e=
xtensions-04#ref-ISO10589" title=3D"&quot;, I. &quot;"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">ISO10589</span></a><span lang=3D"EN-US" =
style=3D"mso-ansi-language:EN-US">].&nbsp;=BB<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:=
p></span></pre>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">The field seems of fixed length (6 octet=
s) while the encoded System ID seems to be of a variable length. If so, wou=
ldn&#8217;t it be useful to indicate how a System
 ID of a length shorter than 6 octets is encoded? (in most or least signifi=
cant octets?).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A79<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">A priori the sum of all 4 sizes must be =
128 bits. Could you specify the error handling when this is not the case? (=
a choice could be to ignore this Sub-Sub-TLV;
 but given the error handling specified for another error, you seem to pref=
er to ignore the whole parent TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A79<o:p></o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"mso-bidi-font-family:Calibri;mso-ansi-la=
nguage:EN-US">&#8220;</span><span lang=3D"EN-US" style=3D"mso-ansi-language=
:EN-US">ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once =
in<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>its parent sub-TLV.<span style=3D"mso-spacerun:yes">&nbsp; </span>If=
 it appears more than once in its parent TLV,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US;mso-fareast-language:FR"><span style=3D"mso-spacerun:yes">&nbsp;&n=
bsp;
</span>the parent TLV MUST be ignored by the receiver.&#8221;<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">In the first sentence, &#8216;parent&#82=
21; refers to the sub-TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">In the second sentence, &#8216;parent&#8=
221; refers to the TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">I assume that the second sentence should=
 also refers to the parent &#8216;sub-TLV&#8217; but I&#8217;d prefer this =
be clarified in the text.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A712.1.1 defines a new IANA registry &q=
uot;sub-sub-TLVs for SRv6 End SID sub-TLV&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">=A712.5 defines a new IANA registry &#82=
20;Sub-Sub-TLVs for SID Sub-TLVs&#8221;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-bidi-font-famil=
y:Calibri;mso-ansi-language:EN-US">Just checking whether both are needed/in=
tended especially as the second references section 7.2. (SRv6 End SID sub-T=
LV)<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Nits:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span class=3D"SpellE"><span lang=3D"EN-US" style=
=3D"mso-ansi-language:EN-US">Idnits</span></span><span lang=3D"EN-US" style=
=3D"mso-ansi-language:EN-US"> reports 1 error &amp; 1 warning that seem val=
id :
<a href=3D"https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/dr=
aft-ietf-lsr-isis-srv6-extensions-04.txt">
https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-ls=
r-isis-srv6-extensions-04.txt</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Page header is &quot; draft-bashandy-isis-srv6-extensions&quot;. Prob=
ably a better name could be found for the RFC. E.g. IS-IS extensions for SR=
v6.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Proposed<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">OLD:<span style=3D"mso-spacerun:yes">&nbsp;
</span>a combination of SID's<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">NEW: a combination of SIDs<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">OLD: is received in both in a<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">NEW: is received in both a<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">--<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">OLD: the this draft<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">NEW: this draft<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US;mso-fareast-language:FR">-----Original Message-----<br>
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps<br>
Sent: Wednesday, January 22, 2020 1:15 AM<br>
To: lsr@ietf.org<br>
Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)<br>
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions</span><span=
 lang=3D"EN-US" style=3D"mso-ansi-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draf=
t-ietf-lsr-isis-srv6-extensions<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><span style=3D"mso-spacerun:yes">&nbsp;
</span>https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions=
/<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Authors please indicate if you aware of any other IPR beyond what is =
posted:<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><span style=3D"mso-spacerun:yes">&nbsp;
</span>https://datatracker.ietf.org/ipr/3796/<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Chris &amp; Acee.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">_______________________________________________<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Lsr mailing list<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">Lsr@ietf.org<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"mso-ansi-language:E=
N-US">https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></span></p>
</div>
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From nobody Fri Jan 24 07:34:40 2020
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Subject: [Lsr] IPR Disclosure Cisco Systems, Inc.'s Statement about IPR related to draft-li-lsr-ospfv3-srv6-extensions
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Dear Zhenbin Li, Zhibo Hu, Dean Cheng, Ketan Talaulikar, Peter Psenak:


An IPR disclosure that pertains to your Internet-Draft entitled "OSPFv3
Extensions for SRv6" (draft-li-lsr-ospfv3-srv6-extensions) was submitted to
the IETF Secretariat on 2020-01-23 and has been posted on the "IETF Page of
Intellectual Property Rights Disclosures"
(https://datatracker.ietf.org/ipr/3980/). The title of the IPR disclosure is
"Cisco Systems, Inc.'s Statement about IPR related to
draft-li-lsr-ospfv3-srv6-extensions"


Thank you

IETF Secretariat


From nobody Fri Jan 24 07:38:45 2020
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To: Christian Hopps <chopps@chopps.org>, lsr@ietf.org
Cc: "Acee Lindem (acee)" <acee@cisco.com>, lsr-ads@ietf.org, draft-li-lsr-ospfv3-srv6-extensions@ietf.org
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hi Chris, Acee,

as a coauthor, I support the WG adoption of this document.

I'm not aware of any undisclosed IPRs.

thanks,
Peter



On 23/01/2020 21:24, Christian Hopps wrote:
> Hi LSR WG and Draft Authors,
> 
> The authors originally requested adoption back @ 105; however, some comments were received and new version was produced. Moving forward...
> 
> This begins a 2 week WG adoption poll for the following draft:
> 
>    https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
>   
> Please indicate your support or objection by Feb 6, 2020.
> 
> Authors, please respond indicating whether you are aware of any IPR that applies to this draft.
> 
> Thanks,
> Chris & Acee.
> 


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>
Thread-Topic: WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/2FVz-5-7FsmNBy4NorBpqYollTs>
Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hi All,

Support the draft as a co-author and I am not aware of any IPR other than w=
hat has been disclosed on this draft.

Thanks,
Ketan

-----Original Message-----
From: Christian Hopps <chopps@chopps.org>=20
Sent: 24 January 2020 01:55
To: lsr@ietf.org
Cc: Christian Hopps <chopps@chopps.org>; Acee Lindem (acee) <acee@cisco.com=
>; lsr-ads@ietf.org; draft-li-lsr-ospfv3-srv6-extensions@ietf.org
Subject: WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions

Hi LSR WG and Draft Authors,

The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...

This begins a 2 week WG adoption poll for the following draft:

  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
=20
Please indicate your support or objection by Feb 6, 2020.

Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.

Thanks,
Chris & Acee.


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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--_000_MWHPR11MB1616620DC9BB708C770009F0C10E0MWHPR11MB1616namp_
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Bruno -

Regarding

<snip>
=A78.2
"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589]. =BB

The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).
<end snip>

It is well known that - although ISO 10589 supports a system-id length betw=
een 1-8 octets - in practice the length 6 is always used. And of course all=
 nodes have to agree to use the same length.

The comparable text from RFC 8667 Section 2.2.2 says:

"Neighbor System-ID:  IS-IS System-ID of length "ID Length" as
                   defined in [ISO10589]."

I suggest that the text in this draft be modified to match this - and the A=
SCII art text changes "6 octets" to "ID Length octets" - again matching RFC=
 8667.

I think there is no need to spend time discussing lengths other than 6.
Would you agree?

   Les


From: Lsr <lsr-bounces@ietf.org> On Behalf Of bruno.decraene@orange.com
Sent: Friday, January 24, 2020 7:25 AM
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Acee Lindem (ace=
e) <acee@cisco.com>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions


Hi authors, WG,



I've re-read the draft. Please find below some minor comments and nits.



Best regards,

--Bruno



Minors:

=3D=3D=3D=3D=3D=3D

" A node indicates that it has support for SRv6 by advertising a new SRv6 C=
apabilities sub-TLV"

I'm not completely certain that "support for SRv6" is perfectly defined. Do=
 you have a reference? Otherwise may be "is an SRv6 Segment Endpoint Node" =
would be better.

Cf https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-3



---

=A74.3

"The Maximum H.Encaps MSD Type specifies the maximum number of SIDs  that c=
an be included as part of the "H.Encaps" behavior"



This is not crystal clear to me when the "reduced encapsulation" is used. I=
n such case we have:

a) the number of SID included (N)

b) the number of SID included in the SRH (N-1)



Could you clarify which one you are referring to?



I assume that this is "b" given the text:

"If the advertised value is zero then the router can apply H.Encaps only by=
 encapsulating the incoming packet in another  IPv6 header without SRH the =
same way IPinIP encapsulation is performed."

But to avoid interop issue, I'd prefer the spec to be non ambiguous. (typic=
ally by saying "SIDs in a SRH" as indicated in =A74.4



---

=A74.2

"in  the top SRH in an SRH stack to which the router can apply "PSP" or  US=
P" as defined in [I-D.ietf-spring-srv6-network-programming]  flavors"



[I-D.ietf-spring-srv6-network-programming] does not define (anymore) "SRH s=
tack", nor "top SRH". Please remove those two terms.



---

=A74.4



"      If the advertised value is zero or no value is advertised

      then it is assumed that the router cannot apply

      "End.DX6" or "End.DT6" behaviors if the extension

      header right underneath the outer IPv6 header is an SRH."



There is no requirement for the SRH to be "right underneath the outer IPv6 =
header".

Cf https://tools.ietf.org/html/rfc8200#section-4.1



Please clarify what is meant precisely. E.g.:

a) if there is an SRH

b) if there is a IPv6 routing header

c) if there is  an IPv6 extension header

?

....



Given the wording in =A74.2, I would suggest "a". However, the technical qu=
estion remains: are those MSD numbers affected by the presence of another I=
Pv6 extension header (before the SRH)?



---

OLD: This is to prevent inconsistent forwarding entries on SRv6 capable/SRv=
6 incapable routers.





I think the below would be clearer

NEW: This is to prevent inconsistent forwarding entries between SRv6 capabl=
e and SRv6 incapable routers.



----

=A77.1



"

     Type: 27 (Suggested value to be assigned by IANA)



     Length: variable.



     MTID: Multitopology Identifier as defined in [RFC5120<https://tools.ie=
tf.org/html/rfc5120>].

     Note that the value 0 is legal."



Personally I would find clearer to move the above text (describing the SRv6=
 Locator TLV) just after the Figure of the SRv6 Locator TLV.



That would also allow the removal of "Locator entry:" since as a result the=
 text and figures for the local entry would also be grouped together.



----

=A77.1

"Loc-Size: 1 octet. Number of bits in the Locator field."



I think that this is the number of bits of the SRv6 Locator, rather than th=
e number of bits of the field.



Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.



"The Locator is encoded in the minimal number of  octets for the given numb=
er of bits."

Do we want to define the trailing bits? E.g. MUST be sent as zero and ignor=
ed when received.



----

=A78.1 (idem for =A78.2)

I may be missing something...



"All End.X SIDs MUST be a subnet of a Locator with matching topology
   and algorithm which is advertised by the same node in an SRv6 Locator
   TLV. =BB


OK.

So what's the point of advertising a field 'algorithm' in the SRv6 End.X SI=
D sub-TLV? The 128-bits SID allows identifying the Locator, which already a=
dvertise an algorithm.

Advertising again the algorithm with the End.X SID waste space and is an op=
portunity for inconsistency hence additional error handling rules/implement=
ations.



----

=A78.2

"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589<https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-=
04#ref-ISO10589>]. =BB



The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).



----

=A79

A priori the sum of all 4 sizes must be 128 bits. Could you specify the err=
or handling when this is not the case? (a choice could be to ignore this Su=
b-Sub-TLV; but given the error handling specified for another error, you se=
em to prefer to ignore the whole parent TLV.

----

=A79

"ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
   its parent sub-TLV.  If it appears more than once in its parent TLV,
   the parent TLV MUST be ignored by the receiver."



In the first sentence, 'parent" refers to the sub-TLV.

In the second sentence, 'parent" refers to the TLV.

I assume that the second sentence should also refers to the parent 'sub-TLV=
' but I'd prefer this be clarified in the text.

----

=A712.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TL=
V"

=A712.5 defines a new IANA registry "Sub-Sub-TLVs for SID Sub-TLVs"



Just checking whether both are needed/intended especially as the second ref=
erences section 7.2. (SRv6 End SID sub-TLV)



Nits:

=3D=3D=3D=3D=3D=3D

Idnits reports 1 error & 1 warning that seem valid : https://tools.ietf.org=
/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions=
-04.txt

---

Page header is " draft-bashandy-isis-srv6-extensions". Probably a better na=
me could be found for the RFC. E.g. IS-IS extensions for SRv6.

---

Proposed

OLD:  a combination of SID's

NEW: a combination of SIDs

---

OLD: is received in both in a

NEW: is received in both a

--

OLD: the this draft

NEW: this draft







-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Wednesday, January 22, 2020 1:15 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Cc: lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>; Christian Hopps; Acee Lindem=
 (acee)
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions



This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions



  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/



Authors please indicate if you aware of any other IPR beyond what is posted=
:



  https://datatracker.ietf.org/ipr/3796/



Thanks,

Chris & Acee.

_______________________________________________

Lsr mailing list

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

https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
______________________________________________



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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bruno &#8211;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regarding<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&lt;snip&gt;<o:p></o=
:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>=A78.2<o:p></o:p></i=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&#8220;System-ID: 6 =
octets of IS-IS System-ID of length &quot;ID Length&quot; as defined in [IS=
O10589]. =BB<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i><o:p>&nbsp;</o:p></i=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>The field seems of f=
ixed length (6 octets) while the encoded System ID seems to be of a variabl=
e length. If so, wouldn&#8217;t it be useful to indicate how a System ID of=
 a length shorter than 6 octets is encoded?
 (in most or least significant octets?).<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&lt;end snip&gt;<o:p=
></o:p></i></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">It is well known that &#8211; although ISO 10589 sup=
ports a system-id length between 1-8 octets &#8211; in practice the length =
6 is always used. And of course all nodes have to agree to use the same len=
gth.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The comparable text from RFC 8667 Section 2.2.2 says=
:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&#8220;Neighbor Syst=
em-ID:&nbsp; IS-IS System-ID of length &quot;ID Length&quot; as<o:p></o:p><=
/i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; defined in [ISO10589].&#8221;<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i><o:p>&nbsp;</o:p></i=
></p>
<p class=3D"MsoNormal">I suggest that the text in this draft be modified to=
 match this &#8211; and the ASCII art text changes &#8220;6 octets&#8221; t=
o &#8220;ID Length octets&#8221; &#8211; again matching RFC 8667.<o:p></o:p=
></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I think there is no need to spend time discussing le=
ngths other than 6.<o:p></o:p></p>
<p class=3D"MsoNormal">Would you agree?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Lsr &lt;lsr-bounces@ietf.org&gt; <b>On =
Behalf Of </b>
bruno.decraene@orange.com<br>
<b>Sent:</b> Friday, January 24, 2020 7:25 AM<br>
<b>To:</b> lsr@ietf.org<br>
<b>Cc:</b> lsr-ads@ietf.org; Christian Hopps &lt;chopps@chopps.org&gt;; Ace=
e Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Subject:</b> Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Hi authors, WG,<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I've re-read the draft. Please find below some mi=
nor comments and nits.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Best regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">--Bruno<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Minors:<o:p></o:p></p>
<p class=3D"MsoPlainText">=3D=3D=3D=3D=3D=3D<o:p></o:p></p>
<p class=3D"MsoPlainText">&quot; A node indicates that it has support for S=
Rv6 by advertising a new SRv6 Capabilities sub-TLV&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">I'm not completely certain that &quot;support for=
 SRv6&quot; is perfectly defined. Do you have a reference? Otherwise may be=
 &quot;is an SRv6 Segment Endpoint Node&quot; would be better.<o:p></o:p></=
p>
<p class=3D"MsoPlainText">Cf <a href=3D"https://tools.ietf.org/html/draft-i=
etf-6man-segment-routing-header-26#section-3">
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-3</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">=A74.3<o:p></o:p></p>
<p class=3D"MsoPlainText">&quot;The Maximum H.Encaps MSD Type specifies the=
 maximum number of SIDs&nbsp; that can be included as part of the &quot;H.E=
ncaps&quot; behavior&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">This is not crystal clear to me when the &quot;re=
duced encapsulation&quot; is used. In such case we have:<o:p></o:p></p>
<p class=3D"MsoPlainText">a) the number of SID included (N)<o:p></o:p></p>
<p class=3D"MsoPlainText">b) the number of SID included in the SRH (N-1)<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Could you clarify which one you are referring to?=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I assume that this is &quot;b&quot; given the tex=
t:<o:p></o:p></p>
<p class=3D"MsoPlainText">&quot;If the advertised value is zero then the ro=
uter can apply H.Encaps only by encapsulating the incoming packet in anothe=
r&nbsp; IPv6 header without SRH the same way IPinIP encapsulation is perfor=
med.&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">But to avoid interop issue, I'd prefer the spec t=
o be non ambiguous. (typically by saying &quot;SIDs in a SRH&quot; as indic=
ated in =A74.4<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">=A74.2<o:p></o:p></p>
<p class=3D"MsoPlainText">&quot;in&nbsp; the top SRH in an SRH stack to whi=
ch the router can apply &quot;PSP&quot; or&nbsp; USP&quot; as defined in [I=
-D.ietf-spring-srv6-network-programming]&nbsp; flavors&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">[I-D.ietf-spring-srv6-network-programming] does n=
ot define (anymore) &quot;SRH stack&quot;, nor &quot;top SRH&quot;. Please =
remove those two terms.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">=A74.4<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&quot;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If the adver=
tised value is zero or no value is advertised<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; then it is assumed=
 that the router cannot apply<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &quot;End.DX6&quot=
; or &quot;End.DT6&quot; behaviors if the extension<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; header right under=
neath the outer IPv6 header is an SRH.&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">There is no requirement for the SRH to be &quot;r=
ight underneath the outer IPv6 header&quot;.<o:p></o:p></p>
<p class=3D"MsoPlainText">Cf <a href=3D"https://tools.ietf.org/html/rfc8200=
#section-4.1">
https://tools.ietf.org/html/rfc8200#section-4.1</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Please clarify what is meant precisely. E.g.:<o:p=
></o:p></p>
<p class=3D"MsoPlainText">a) if there is an SRH<o:p></o:p></p>
<p class=3D"MsoPlainText">b) if there is a IPv6 routing header<o:p></o:p></=
p>
<p class=3D"MsoPlainText">c) if there is&nbsp; an IPv6 extension header<o:p=
></o:p></p>
<p class=3D"MsoPlainText">?<o:p></o:p></p>
<p class=3D"MsoPlainText">....<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Given the wording in =A74.2, I would suggest &quo=
t;a&quot;. However, the technical question remains: are those MSD numbers a=
ffected by the presence of another IPv6 extension header (before the SRH)?<=
o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">OLD: This is to prevent inconsistent forwarding e=
ntries on SRv6 capable/SRv6 incapable routers.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I think the below would be clearer<o:p></o:p></p>
<p class=3D"MsoPlainText">NEW: This is to prevent inconsistent forwarding e=
ntries between SRv6 capable and SRv6 incapable routers.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A77.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<pre>&#8220;<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp; Type: 27 (Suggested value to be assigned by I=
ANA)<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp; Length: variable.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp; MTID: Multitopology Identifier as defined in =
[<span lang=3D"FR"><a href=3D"https://tools.ietf.org/html/rfc5120" title=3D=
"&quot;M-ISIS: Multi Topology (MT) Routing in Intermediate System to Interm=
ediate Systems (IS-ISs)&quot;"><span lang=3D"EN-US">RFC5120</span></a></spa=
n>].<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp; Note that the value 0 is legal.&#8221;<o:p></=
o:p></pre>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Personally I would find clearer to move the above=
 text (describing the SRv6 Locator TLV) just after the Figure of the SRv6 L=
ocator TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">That would also allow the removal of &#8220;Locat=
or entry:&#8221; since as a result the text and figures for the local entry=
 would also be grouped together.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<pre>=A77.1<o:p></o:p></pre>
<pre>&#8220;Loc-Size: 1 octet. Number of bits in the Locator field.&#8221;<=
o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<p class=3D"MsoPlainText">I think that this is the number of bits of the SR=
v6 Locator, rather than the number of bits of the field.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Proposed NEW: Loc-Size: 1 octet. Number of bits i=
n the SRv6 Locator.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&#8220;The Locator is encoded in the minimal numb=
er of&nbsp; octets for the given number of bits.&#8221;<o:p></o:p></p>
<p class=3D"MsoPlainText">Do we want to define the trailing bits? E.g. MUST=
 be sent as zero and ignored when received.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A78.1 (idem for =A78.2)<o:p></o:p></p>
<p class=3D"MsoPlainText">I may be missing something&#8230;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<pre>&#8220;All End.X SIDs MUST be a subnet of a Locator with matching topo=
logy<o:p></o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">&nbsp;&nbsp; and algorithm which i=
s advertised by the same node in an SRv6 Locator<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">&nbsp;&nbsp;
</span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:FR">TLV.&nbsp;=BB<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoPlainText">OK. <o:p></o:p></p>
<p class=3D"MsoPlainText">So what&#8217;s the point of advertising a field =
&#8216;algorithm&#8217; in the SRv6 End.X SID sub-TLV? The 128-bits SID all=
ows identifying the Locator, which already advertise an algorithm.<o:p></o:=
p></p>
<p class=3D"MsoPlainText">Advertising again the algorithm with the End.X SI=
D waste space and is an opportunity for inconsistency hence additional erro=
r handling rules/implementations.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A78.2<o:p></o:p></p>
<pre>&#8220;System-ID: 6 octets of IS-IS System-ID of length &quot;ID Lengt=
h&quot; as defined in [<span lang=3D"FR"><a href=3D"https://tools.ietf.org/=
html/draft-ietf-lsr-isis-srv6-extensions-04#ref-ISO10589" title=3D"&quot;, =
I. &quot;"><span lang=3D"EN-US">ISO10589</span></a></span>].&nbsp;=BB<o:p><=
/o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<p class=3D"MsoPlainText">The field seems of fixed length (6 octets) while =
the encoded System ID seems to be of a variable length. If so, wouldn&#8217=
;t it be useful to indicate how a System ID of a length shorter than 6 octe=
ts is encoded? (in most or least significant
 octets?).<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A79<o:p></o:p></p>
<p class=3D"MsoPlainText">A priori the sum of all 4 sizes must be 128 bits.=
 Could you specify the error handling when this is not the case? (a choice =
could be to ignore this Sub-Sub-TLV; but given the error handling specified=
 for another error, you seem to prefer
 to ignore the whole parent TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A79<o:p></o:p></p>
<pre>&#8220;ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than o=
nce in<o:p></o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">&nbsp;&nbsp; its parent sub-TLV.&n=
bsp; If it appears more than once in its parent TLV,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">&nbsp;&nbsp; the parent TLV MUST b=
e ignored by the receiver.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">In the first sentence, &#8216;parent&#8221; refer=
s to the sub-TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText">In the second sentence, &#8216;parent&#8221; refe=
rs to the TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText">I assume that the second sentence should also ref=
ers to the parent &#8216;sub-TLV&#8217; but I&#8217;d prefer this be clarif=
ied in the text.<o:p></o:p></p>
<p class=3D"MsoPlainText">----<o:p></o:p></p>
<p class=3D"MsoPlainText">=A712.1.1 defines a new IANA registry &quot;sub-s=
ub-TLVs for SRv6 End SID sub-TLV&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">=A712.5 defines a new IANA registry &#8220;Sub-Su=
b-TLVs for SID Sub-TLVs&#8221;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Just checking whether both are needed/intended es=
pecially as the second references section 7.2. (SRv6 End SID sub-TLV)<o:p><=
/o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Nits:<o:p></o:p></p>
<p class=3D"MsoPlainText">=3D=3D=3D=3D=3D=3D<o:p></o:p></p>
<p class=3D"MsoPlainText">Idnits reports 1 error &amp; 1 warning that seem =
valid : <a href=3D"https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.o=
rg/id/draft-ietf-lsr-isis-srv6-extensions-04.txt">
https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-ls=
r-isis-srv6-extensions-04.txt</a><o:p></o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">Page header is &quot; draft-bashandy-isis-srv6-ex=
tensions&quot;. Probably a better name could be found for the RFC. E.g. IS-=
IS extensions for SRv6.<o:p></o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">Proposed<o:p></o:p></p>
<p class=3D"MsoPlainText">OLD:&nbsp; a combination of SID's<o:p></o:p></p>
<p class=3D"MsoPlainText">NEW: a combination of SIDs<o:p></o:p></p>
<p class=3D"MsoPlainText">---<o:p></o:p></p>
<p class=3D"MsoPlainText">OLD: is received in both in a<o:p></o:p></p>
<p class=3D"MsoPlainText">NEW: is received in both a<o:p></o:p></p>
<p class=3D"MsoPlainText">--<o:p></o:p></p>
<p class=3D"MsoPlainText">OLD: the this draft<o:p></o:p></p>
<p class=3D"MsoPlainText">NEW: this draft<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:FR">-----Orig=
inal Message-----<br>
From: Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:lsr-bounces@ietf.=
org</a>] On Behalf Of Christian Hopps<br>
Sent: Wednesday, January 22, 2020 1:15 AM<br>
To: <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
Cc: <a href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; Christian Hop=
ps; Acee Lindem (acee)<br>
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions</span><o:p>=
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">This begins a 2 week WG Last Call, ending after F=
eb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; <a href=3D"https://datatracker.ietf.org/do=
c/draft-ietf-lsr-isis-srv6-extensions/">
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a><o=
:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Authors please indicate if you aware of any other=
 IPR beyond what is posted:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp; <a href=3D"https://datatracker.ietf.org/ip=
r/3796/">https://datatracker.ietf.org/ipr/3796/</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Thanks,<o:p></o:p></p>
<p class=3D"MsoPlainText">Chris &amp; Acee.<o:p></o:p></p>
<p class=3D"MsoPlainText">_______________________________________________<o=
:p></o:p></p>
<p class=3D"MsoPlainText">Lsr mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a><=
o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://www.ietf.org/mailman/listinfo/=
lsr">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
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<pre><span lang=3D"FR">If you have received this email in error, please not=
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<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
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<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/Jz_WzDRVxUbkLrENz3uimFRZT-o>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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I support progressing this draft.

   Les

> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
> Sent: Tuesday, January 21, 2020 4:15 PM
> To: lsr@ietf.org
> Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Acee Lindem
> (acee) <acee@cisco.com>
> Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
>=20
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ie=
tf-lsr-
> isis-srv6-extensions
>=20
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
>=20
> Authors please indicate if you aware of any other IPR beyond what is post=
ed:
>=20
>   https://datatracker.ietf.org/ipr/3796/
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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I support adopting this draft.

   Les

> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
> Sent: Thursday, January 23, 2020 12:25 PM
> To: lsr@ietf.org
> Cc: draft-li-lsr-ospfv3-srv6-extensions@ietf.org; lsr-ads@ietf.org; Chris=
tian
> Hopps <chopps@chopps.org>; Acee Lindem (acee) <acee@cisco.com>
> Subject: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
>=20
> Hi LSR WG and Draft Authors,
>=20
> The authors originally requested adoption back @ 105; however, some
> comments were received and new version was produced. Moving forward...
>=20
> This begins a 2 week WG adoption poll for the following draft:
>=20
>   https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
>=20
> Please indicate your support or objection by Feb 6, 2020.
>=20
> Authors, please respond indicating whether you are aware of any IPR that
> applies to this draft.
>=20
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Les,


From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Friday, January 24, 2020 5:39 PM
To: DECRAENE Bruno TGI/OLN; lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
Subject: RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

Bruno -

Regarding

<snip>
=A78.2
"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589]. =BB

The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).
<end snip>

It is well known that - although ISO 10589 supports a system-id length betw=
een 1-8 octets - in practice the length 6 is always used. And of course all=
 nodes have to agree to use the same length.
[Bruno] Just to clarify, I was asking for consistency between the length of=
 the field ('6 octets') and the lengths of its content ('  "ID Length" as d=
efined in [ISO10589] ').

The comparable text from RFC 8667 Section 2.2.2 says:

"Neighbor System-ID:  IS-IS System-ID of length "ID Length" as
                   defined in [ISO10589]."

I suggest that the text in this draft be modified to match this - and the A=
SCII art text changes "6 octets" to "ID Length octets" - again matching RFC=
 8667.

[Bruno] Looks better as this is consistent. I feel that it could be even be=
tter as I still see two options:

-          a) If the length of the System ID is fixed to 6, I think that th=
is needs to be indicated in the draft (rather than "as defined in [ISO10589=
]" which allows for a variable length).

-          b) If the length of the System ID is variable "as defined in [IS=
O10589]", then I don't see how the receiver can know this length and succes=
sfully parse the sub-TLV, except may be by looking at another field in the =
LSP

Looking at RFC 5305, it seems to define/hard code a length of 6 for the ID,=
 which is aligned with option "a" and what is much probably meant in this d=
raft. https://tools.ietf.org/html/rfc5305#section-3
(That been said RFC 5306 (i.e. next RFC) , which you co-author, seems to al=
low for a variable length....)


Hence I would rather propose  "System-ID: 6 octets of IS-IS System-ID" as p=
er option "a". But I'm also fine with option "b" if you want.

--Bruno
I think there is no need to spend time discussing lengths other than 6.
Would you agree?


   Les


From: Lsr <lsr-bounces@ietf.org> On Behalf Of bruno.decraene@orange.com
Sent: Friday, January 24, 2020 7:25 AM
To: lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Acee Lindem (ace=
e) <acee@cisco.com>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions


Hi authors, WG,



I've re-read the draft. Please find below some minor comments and nits.



Best regards,

--Bruno



Minors:

=3D=3D=3D=3D=3D=3D

" A node indicates that it has support for SRv6 by advertising a new SRv6 C=
apabilities sub-TLV"

I'm not completely certain that "support for SRv6" is perfectly defined. Do=
 you have a reference? Otherwise may be "is an SRv6 Segment Endpoint Node" =
would be better.

Cf https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-3



---

=A74.3

"The Maximum H.Encaps MSD Type specifies the maximum number of SIDs  that c=
an be included as part of the "H.Encaps" behavior"



This is not crystal clear to me when the "reduced encapsulation" is used. I=
n such case we have:

a) the number of SID included (N)

b) the number of SID included in the SRH (N-1)



Could you clarify which one you are referring to?



I assume that this is "b" given the text:

"If the advertised value is zero then the router can apply H.Encaps only by=
 encapsulating the incoming packet in another  IPv6 header without SRH the =
same way IPinIP encapsulation is performed."

But to avoid interop issue, I'd prefer the spec to be non ambiguous. (typic=
ally by saying "SIDs in a SRH" as indicated in =A74.4



---

=A74.2

"in  the top SRH in an SRH stack to which the router can apply "PSP" or  US=
P" as defined in [I-D.ietf-spring-srv6-network-programming]  flavors"



[I-D.ietf-spring-srv6-network-programming] does not define (anymore) "SRH s=
tack", nor "top SRH". Please remove those two terms.



---

=A74.4



"      If the advertised value is zero or no value is advertised

      then it is assumed that the router cannot apply

      "End.DX6" or "End.DT6" behaviors if the extension

      header right underneath the outer IPv6 header is an SRH."



There is no requirement for the SRH to be "right underneath the outer IPv6 =
header".

Cf https://tools.ietf.org/html/rfc8200#section-4.1



Please clarify what is meant precisely. E.g.:

a) if there is an SRH

b) if there is a IPv6 routing header

c) if there is  an IPv6 extension header

?

....



Given the wording in =A74.2, I would suggest "a". However, the technical qu=
estion remains: are those MSD numbers affected by the presence of another I=
Pv6 extension header (before the SRH)?



---

OLD: This is to prevent inconsistent forwarding entries on SRv6 capable/SRv=
6 incapable routers.





I think the below would be clearer

NEW: This is to prevent inconsistent forwarding entries between SRv6 capabl=
e and SRv6 incapable routers.



----

=A77.1



"

     Type: 27 (Suggested value to be assigned by IANA)



     Length: variable.



     MTID: Multitopology Identifier as defined in [RFC5120<https://tools.ie=
tf.org/html/rfc5120>].

     Note that the value 0 is legal."



Personally I would find clearer to move the above text (describing the SRv6=
 Locator TLV) just after the Figure of the SRv6 Locator TLV.



That would also allow the removal of "Locator entry:" since as a result the=
 text and figures for the local entry would also be grouped together.



----

=A77.1

"Loc-Size: 1 octet. Number of bits in the Locator field."



I think that this is the number of bits of the SRv6 Locator, rather than th=
e number of bits of the field.



Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.



"The Locator is encoded in the minimal number of  octets for the given numb=
er of bits."

Do we want to define the trailing bits? E.g. MUST be sent as zero and ignor=
ed when received.



----

=A78.1 (idem for =A78.2)

I may be missing something...



"All End.X SIDs MUST be a subnet of a Locator with matching topology
   and algorithm which is advertised by the same node in an SRv6 Locator
   TLV. =BB


OK.

So what's the point of advertising a field 'algorithm' in the SRv6 End.X SI=
D sub-TLV? The 128-bits SID allows identifying the Locator, which already a=
dvertise an algorithm.

Advertising again the algorithm with the End.X SID waste space and is an op=
portunity for inconsistency hence additional error handling rules/implement=
ations.



----

=A78.2

"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589<https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-=
04#ref-ISO10589>]. =BB



The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).



----

=A79

A priori the sum of all 4 sizes must be 128 bits. Could you specify the err=
or handling when this is not the case? (a choice could be to ignore this Su=
b-Sub-TLV; but given the error handling specified for another error, you se=
em to prefer to ignore the whole parent TLV.

----

=A79

"ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
   its parent sub-TLV.  If it appears more than once in its parent TLV,
   the parent TLV MUST be ignored by the receiver."



In the first sentence, 'parent" refers to the sub-TLV.

In the second sentence, 'parent" refers to the TLV.

I assume that the second sentence should also refers to the parent 'sub-TLV=
' but I'd prefer this be clarified in the text.

----

=A712.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TL=
V"

=A712.5 defines a new IANA registry "Sub-Sub-TLVs for SID Sub-TLVs"



Just checking whether both are needed/intended especially as the second ref=
erences section 7.2. (SRv6 End SID sub-TLV)



Nits:

=3D=3D=3D=3D=3D=3D

Idnits reports 1 error & 1 warning that seem valid : https://tools.ietf.org=
/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions=
-04.txt

---

Page header is " draft-bashandy-isis-srv6-extensions". Probably a better na=
me could be found for the RFC. E.g. IS-IS extensions for SRv6.

---

Proposed

OLD:  a combination of SID's

NEW: a combination of SIDs

---

OLD: is received in both in a

NEW: is received in both a

--

OLD: the this draft

NEW: this draft







-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Wednesday, January 22, 2020 1:15 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Cc: lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>; Christian Hopps; Acee Lindem=
 (acee)
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions



This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions



  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/



Authors please indicate if you aware of any other IPR beyond what is posted:



  https://datatracker.ietf.org/ipr/3796/



Thanks,

Chris & Acee.

_______________________________________________

Lsr mailing list

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

https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
______________________________________________



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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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<body lang=3D"FR" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:35.4=
pt">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language=
:EN-US">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font=
-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&=
quot;Times New Roman&quot;;mso-ansi-language:EN-US">
 Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] <br>
<b>Sent:</b> Friday, January 24, 2020 5:39 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN; lsr@ietf.org<br>
<b>Cc:</b> lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)<br>
<b>Subject:</b> RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Bruno &#8211;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Regarding<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&lt;snip&gt;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A78.2<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&#8220;System-ID: 6 octets of IS-IS Syst=
em-ID of length &quot;ID Length&quot; as defined in [ISO10589]. =BB<o:p></o=
:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">The field seems of fixed length (6 octet=
s) while the encoded System ID seems to be of a variable length. If so, wou=
ldn&#8217;t it be useful to indicate how a System
 ID of a length shorter than 6 octets is encoded? (in most or least signifi=
cant octets?).<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&lt;end snip&gt;<o:p></o:p></span></i></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">It is well known that &#8211; although ISO =
10589 supports a system-id length between 1-8 octets &#8211; in practice th=
e length 6 is always used. And of course all nodes have
 to agree to use the same length.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b style=3D"mso-bidi-font-weight:normal"><i style=3D=
"mso-bidi-font-style:normal"><span lang=3D"EN-US" style=3D"mso-ascii-font-f=
amily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Time=
s New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"></span></i></b><sp=
an lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-hansi-font-fam=
ily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;=
mso-ansi-language:EN-US">[Bruno]
 Just to clarify, I was asking for consistency between the length of the fi=
eld (&#8216;6 octets&#8217;) and the lengths of its content (&#8216;<span s=
tyle=3D"mso-spacerun:yes">&nbsp;
</span>&quot;ID Length&quot; as defined in [ISO10589] &#8216;).<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The comparable text from RFC 8667 Section 2=
.2.2 says:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&#8220;Neighbor System-ID:&nbsp; IS-IS S=
ystem-ID of length &quot;ID Length&quot; as<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; define=
d in [ISO10589].&#8221;<o:p></o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">I suggest that the text in this draft be mo=
dified to match this &#8211; and the ASCII art text changes &#8220;6 octets=
&#8221; to &#8220;ID Length octets&#8221; &#8211; again matching RFC 8667.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">[Bruno] Looks better as =
this is consistent. I feel that it could be even
 better as I still see two options:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-fareast-fon=
t-family:Calibri;color:#1F497D;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ascii-font=
-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">a) If the length=
 of the System ID is fixed to 6, I think that
 this needs to be indicated in the draft (rather than &#8220;as defined in =
[ISO10589]&#8221; which allows for a variable length).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-fareast-fon=
t-family:Calibri;color:#1F497D;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ascii-font=
-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">b) If the length=
 of the System ID is variable &#8220;as defined in [ISO10589]&#8221;,
 then I don&#8217;t see how the receiver can know this length and successfu=
lly parse the sub-TLV, except may be by looking at another field in the LSP=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Looking at RFC 5305, it =
seems to define/hard code a length of 6 for the
 ID, which is aligned with option &#8220;a&#8221; and what is much probably=
 meant in this draft.
<a href=3D"https://tools.ietf.org/html/rfc5305#section-3">https://tools.iet=
f.org/html/rfc5305#section-3</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">(That been said RFC 5306=
 (i.e. next RFC) , which you co-author, seems to
 allow for a variable length&#8230;.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<pre><span lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-hansi-=
font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:=
#1F497D;mso-ansi-language:EN-US">Hence I would rather propose <span style=
=3D"mso-spacerun:yes">&nbsp;</span>&#8220;</span><span lang=3D"EN-US" style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-f=
amily:&quot;Times New Roman&quot;;mso-ansi-language:EN-US">System-ID: 6 oct=
ets of IS-IS System-ID&#8221; </span><span lang=3D"EN-US" style=3D"mso-asci=
i-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&q=
uot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">as per opt=
ion &#8220;a&#8221;. But I&#8217;m also fine with option &#8220;b&#8221; if=
 you want.</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family=
:&quot;Courier New&quot;;mso-fareast-font-family:&quot;Times New Roman&quot=
;;mso-ansi-language:EN-US"><o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><b style=3D"mso-bidi-font-weight:normal"><i style=3D=
"mso-bidi-font-style:normal"><span lang=3D"EN-US" style=3D"mso-ascii-font-f=
amily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Time=
s New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"></span></i></b><sp=
an lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-hansi-font-fam=
ily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;=
mso-ansi-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">I think there is no need to spend time disc=
ussing lengths other than 6.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Would you agree?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"mso-asci=
i-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&q=
uot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; Les<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US"> Lsr &lt;lsr-bounces@ietf.org&gt;
<b>On Behalf Of </b>bruno.decraene@orange.com<br>
<b>Sent:</b> Friday, January 24, 2020 7:25 AM<br>
<b>To:</b> lsr@ietf.org<br>
<b>Cc:</b> lsr-ads@ietf.org; Christian Hopps &lt;chopps@chopps.org&gt;; Ace=
e Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Subject:</b> Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Hi authors, WG,<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I've re-read the draft. Please find belo=
w some minor comments and nits.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Minors:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&quot; A node indicates that it has supp=
ort for SRv6 by advertising a new SRv6 Capabilities sub-TLV&quot;<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I'm not completely certain that &quot;su=
pport for SRv6&quot; is perfectly defined. Do you have a reference? Otherwi=
se may be &quot;is an SRv6 Segment Endpoint Node&quot; would
 be better.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Cf
<a href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-head=
er-26#section-3">
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-3</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A74.3<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&quot;The Maximum H.Encaps MSD Type spec=
ifies the maximum number of SIDs&nbsp; that can be included as part of the =
&quot;H.Encaps&quot; behavior&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">This is not crystal clear to me when the=
 &quot;reduced encapsulation&quot; is used. In such case we have:<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">a) the number of SID included (N)<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">b) the number of SID included in the SRH=
 (N-1)<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Could you clarify which one you are refe=
rring to?<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I assume that this is &quot;b&quot; give=
n the text:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&quot;If the advertised value is zero th=
en the router can apply H.Encaps only by encapsulating the incoming packet =
in another&nbsp; IPv6 header without SRH the same
 way IPinIP encapsulation is performed.&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">But to avoid interop issue, I'd prefer t=
he spec to be non ambiguous. (typically by saying &quot;SIDs in a SRH&quot;=
 as indicated in =A74.4<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A74.2<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&quot;in&nbsp; the top SRH in an SRH sta=
ck to which the router can apply &quot;PSP&quot; or&nbsp; USP&quot; as defi=
ned in [I-D.ietf-spring-srv6-network-programming]&nbsp; flavors&quot;<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">[I-D.ietf-spring-srv6-network-programmin=
g] does not define (anymore) &quot;SRH stack&quot;, nor &quot;top SRH&quot;=
. Please remove those two terms.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A74.4<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&quot;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If =
the advertised value is zero or no value is advertised<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; then it i=
s assumed that the router cannot apply<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &quot;End=
.DX6&quot; or &quot;End.DT6&quot; behaviors if the extension<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; header ri=
ght underneath the outer IPv6 header is an SRH.&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">There is no requirement for the SRH to b=
e &quot;right underneath the outer IPv6 header&quot;.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Cf
<a href=3D"https://tools.ietf.org/html/rfc8200#section-4.1">https://tools.i=
etf.org/html/rfc8200#section-4.1</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Please clarify what is meant precisely. =
E.g.:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">a) if there is an SRH<o:p></o:p></span><=
/p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">b) if there is a IPv6 routing header<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">c) if there is&nbsp; an IPv6 extension h=
eader<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">?<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">....<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Given the wording in =A74.2, I would sug=
gest &quot;a&quot;. However, the technical question remains: are those MSD =
numbers affected by the presence of another IPv6 extension
 header (before the SRH)?<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">OLD: This is to prevent inconsistent for=
warding entries on SRv6 capable/SRv6 incapable routers.<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I think the below would be clearer<o:p><=
/o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">NEW: This is to prevent inconsistent for=
warding entries between SRv6 capable and SRv6 incapable routers.<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A77.1<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&#8220;<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbs=
p; Type: 27 (Suggested value to be assigned by IANA)<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbs=
p; Length: variable.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbs=
p; MTID: Multitopology Identifier as defined in [</span><span style=3D"font=
-size:10.0pt;font-family:&quot;Courier New&quot;"><a href=3D"https://tools.=
ietf.org/html/rfc5120" title=3D"&quot;M-ISIS: Multi Topology (MT) Routing i=
n Intermediate System to Intermediate Systems (IS-ISs)&quot;"><span lang=3D=
"EN-US" style=3D"mso-ansi-language:EN-US">RFC5120</span></a></span><span la=
ng=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;=
mso-ansi-language:EN-US">].<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbs=
p; Note that the value 0 is legal.&#8221;<o:p></o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Personally I would find clearer to move =
the above text (describing the SRv6 Locator TLV) just after the Figure of t=
he SRv6 Locator TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">That would also allow the removal of &#8=
220;Locator entry:&#8221; since as a result the text and figures for the lo=
cal entry would also be grouped together.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">=A77.1<o:p></o:p></spa=
n></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&#8220;Loc-Size: 1 oct=
et. Number of bits in the Locator field.&#8221;<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I think that this is the number of bits =
of the SRv6 Locator, rather than the number of bits of the field.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Proposed NEW: Loc-Size: 1 octet. Number =
of bits in the SRv6 Locator.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&#8220;The Locator is encoded in the min=
imal number of&nbsp; octets for the given number of bits.&#8221;<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Do we want to define the trailing bits? =
E.g. MUST be sent as zero and ignored when received.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A78.1 (idem for =A78.2)<o:p></o:p></spa=
n></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I may be missing something&#8230;<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&#8220;All End.X SIDs =
MUST be a subnet of a Locator with matching topology<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">&nbsp;&nbsp; and algorithm which is advertised by the same node i=
n an SRv6 Locator<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">&nbsp;&nbsp;
</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;"=
>TLV.&nbsp;=BB<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">OK.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">So what&#8217;s the point of advertising=
 a field &#8216;algorithm&#8217; in the SRv6 End.X SID sub-TLV? The 128-bit=
s SID allows identifying the Locator, which already advertise
 an algorithm.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Advertising again the algorithm with the=
 End.X SID waste space and is an opportunity for inconsistency hence additi=
onal error handling rules/implementations.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A78.2<o:p></o:p></span></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&#8220;System-ID: 6 oc=
tets of IS-IS System-ID of length &quot;ID Length&quot; as defined in [</sp=
an><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;"><a =
href=3D"https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04#=
ref-ISO10589" title=3D"&quot;, I. &quot;"><span lang=3D"EN-US" style=3D"mso=
-ansi-language:EN-US">ISO10589</span></a></span><span lang=3D"EN-US" style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-language:=
EN-US">].&nbsp;=BB<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">The field seems of fixed length (6 octet=
s) while the encoded System ID seems to be of a variable length. If so, wou=
ldn&#8217;t it be useful to indicate how a System
 ID of a length shorter than 6 octets is encoded? (in most or least signifi=
cant octets?).<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A79<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">A priori the sum of all 4 sizes must be =
128 bits. Could you specify the error handling when this is not the case? (=
a choice could be to ignore this Sub-Sub-TLV;
 but given the error handling specified for another error, you seem to pref=
er to ignore the whole parent TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A79<o:p></o:p></span></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-ansi-language:EN-US">&#8220;ISIS SRv6 SID S=
tructure Sub-Sub-TLV MUST NOT appear more than once in<o:p></o:p></span></p=
re>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">&nbsp;&nbsp; its parent sub-TLV.&nbsp; If it appears more than on=
ce in its parent TLV,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">&nbsp;&nbsp; the parent TLV MUST be ignored by the receiver.&#822=
1;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">In the first sentence, &#8216;parent&#82=
21; refers to the sub-TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">In the second sentence, &#8216;parent&#8=
221; refers to the TLV.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">I assume that the second sentence should=
 also refers to the parent &#8216;sub-TLV&#8217; but I&#8217;d prefer this =
be clarified in the text.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">----<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A712.1.1 defines a new IANA registry &q=
uot;sub-sub-TLVs for SRv6 End SID sub-TLV&quot;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=A712.5 defines a new IANA registry &#82=
20;Sub-Sub-TLVs for SID Sub-TLVs&#8221;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Just checking whether both are needed/in=
tended especially as the second references section 7.2. (SRv6 End SID sub-T=
LV)<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Nits:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Idnits reports 1 error &amp; 1 warning t=
hat seem valid :
<a href=3D"https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/dr=
aft-ietf-lsr-isis-srv6-extensions-04.txt">
https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-ls=
r-isis-srv6-extensions-04.txt</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Page header is &quot; draft-bashandy-isi=
s-srv6-extensions&quot;. Probably a better name could be found for the RFC.=
 E.g. IS-IS extensions for SRv6.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Proposed<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">OLD:&nbsp; a combination of SID's<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">NEW: a combination of SIDs<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">---<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">OLD: is received in both in a<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">NEW: is received in both a<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">--<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">OLD: the this draft<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">NEW: this draft<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">-----Original Message-----<br>
From: Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:lsr-bounces@ietf.=
org</a>] On Behalf Of Christian Hopps<br>
Sent: Wednesday, January 22, 2020 1:15 AM<br>
To: <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
Cc: <a href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; Christian Hop=
ps; Acee Lindem (acee)<br>
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">This begins a 2 week WG Last Call, endin=
g after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extens=
ions/">https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions=
/</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Authors please indicate if you aware of =
any other IPR beyond what is posted:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">&nbsp;
<a href=3D"https://datatracker.ietf.org/ipr/3796/">https://datatracker.ietf=
.org/ipr/3796/</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Chris &amp; Acee.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">________________________________________=
_______<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">Lsr mailing list<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf=
.org</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><a href=3D"https://www.ietf.org/mailman/=
listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></spa=
n></p>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">_____________________________________________________________=
____________________________________________________________<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">Ce message et ses pieces jointes peuvent contenir des informa=
tions confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">pas etre diffuses, exploites ou copies sans autorisation. Si =
vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">a l'expediteur et le detruire ainsi que les pieces jointes. L=
es messages electroniques etant susceptibles d'alteration,<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">Orange decline toute responsabilite si ce message a ete alter=
e, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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--_000_MWHPR11MB1616932400DACA657B2946D8C10E0MWHPR11MB1616namp_
Content-Type: text/plain; charset="iso-8859-1"
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Bruno -

ISO 10589 defines/advertises a system ID length which can be 1-8 octets.
ISO 10589 also requires that every router in the domain use the same ID len=
gth:

7.3.15.1 Action on receipt of a link state PDU
...
4)            If the ID Length field of the PDU is not equal to the value o=
f the IS's routeingDomainIDLength, the PDU shall be discarded and an iDFiel=
dLengthMismatch event generated.

As previously stated, from a practical standpoint, existing implementations=
 only support a length of 6 - which is why RFC 5305 definition "works". But=
 if there was ever a need to support an ID length other than 6, the TLV def=
inition defined in RFC 5305 would still work - it would just have to be rei=
nterpreted to use the ID length defined for the domain.

In most specifications, we try to use ID Length so this issue is more expli=
citly addressed and I think that is the more preferred method. So I do not =
agree that we should use "6 explicitly".

If you want to pursue a clarification regarding RFC 5305 in this regard you=
 may - though I hope we could agree this isn't a high priority issue.

   Les



From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Friday, January 24, 2020 9:19 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org
Cc: lsr-ads@ietf.org; Christian Hopps <chopps@chopps.org>; Acee Lindem (ace=
e) <acee@cisco.com>
Subject: RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

Les,


From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Friday, January 24, 2020 5:39 PM
To: DECRAENE Bruno TGI/OLN; lsr@ietf.org<mailto:lsr@ietf.org>
Cc: lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>; Christian Hopps; Acee Lindem=
 (acee)
Subject: RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

Bruno -

Regarding

<snip>
=A78.2
"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589]. =BB

The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).
<end snip>

It is well known that - although ISO 10589 supports a system-id length betw=
een 1-8 octets - in practice the length 6 is always used. And of course all=
 nodes have to agree to use the same length.
[Bruno] Just to clarify, I was asking for consistency between the length of=
 the field ('6 octets') and the lengths of its content ('  "ID Length" as d=
efined in [ISO10589] ').

The comparable text from RFC 8667 Section 2.2.2 says:

"Neighbor System-ID:  IS-IS System-ID of length "ID Length" as
                   defined in [ISO10589]."

I suggest that the text in this draft be modified to match this - and the A=
SCII art text changes "6 octets" to "ID Length octets" - again matching RFC=
 8667.

[Bruno] Looks better as this is consistent. I feel that it could be even be=
tter as I still see two options:

  *   a) If the length of the System ID is fixed to 6, I think that this ne=
eds to be indicated in the draft (rather than "as defined in [ISO10589]" wh=
ich allows for a variable length).
  *   b) If the length of the System ID is variable "as defined in [ISO1058=
9]", then I don't see how the receiver can know this length and successfull=
y parse the sub-TLV, except may be by looking at another field in the LSP

Looking at RFC 5305, it seems to define/hard code a length of 6 for the ID,=
 which is aligned with option "a" and what is much probably meant in this d=
raft. https://tools.ietf.org/html/rfc5305#section-3
(That been said RFC 5306 (i.e. next RFC) , which you co-author, seems to al=
low for a variable length....)


Hence I would rather propose  "System-ID: 6 octets of IS-IS System-ID" as p=
er option "a". But I'm also fine with option "b" if you want.

--Bruno

I think there is no need to spend time discussing lengths other than 6.
Would you agree?


   Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of =
bruno.decraene@orange.com<mailto:bruno.decraene@orange.com>
Sent: Friday, January 24, 2020 7:25 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Cc: lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>; Christian Hopps <chopps@chop=
ps.org<mailto:chopps@chopps.org>>; Acee Lindem (acee) <acee@cisco.com<mailt=
o:acee@cisco.com>>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions


Hi authors, WG,



I've re-read the draft. Please find below some minor comments and nits.



Best regards,

--Bruno



Minors:

=3D=3D=3D=3D=3D=3D

" A node indicates that it has support for SRv6 by advertising a new SRv6 C=
apabilities sub-TLV"

I'm not completely certain that "support for SRv6" is perfectly defined. Do=
 you have a reference? Otherwise may be "is an SRv6 Segment Endpoint Node" =
would be better.

Cf https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-3



---

=A74.3

"The Maximum H.Encaps MSD Type specifies the maximum number of SIDs  that c=
an be included as part of the "H.Encaps" behavior"



This is not crystal clear to me when the "reduced encapsulation" is used. I=
n such case we have:

a) the number of SID included (N)

b) the number of SID included in the SRH (N-1)



Could you clarify which one you are referring to?



I assume that this is "b" given the text:

"If the advertised value is zero then the router can apply H.Encaps only by=
 encapsulating the incoming packet in another  IPv6 header without SRH the =
same way IPinIP encapsulation is performed."

But to avoid interop issue, I'd prefer the spec to be non ambiguous. (typic=
ally by saying "SIDs in a SRH" as indicated in =A74.4



---

=A74.2

"in  the top SRH in an SRH stack to which the router can apply "PSP" or  US=
P" as defined in [I-D.ietf-spring-srv6-network-programming]  flavors"



[I-D.ietf-spring-srv6-network-programming] does not define (anymore) "SRH s=
tack", nor "top SRH". Please remove those two terms.



---

=A74.4



"      If the advertised value is zero or no value is advertised

      then it is assumed that the router cannot apply

      "End.DX6" or "End.DT6" behaviors if the extension

      header right underneath the outer IPv6 header is an SRH."



There is no requirement for the SRH to be "right underneath the outer IPv6 =
header".

Cf https://tools.ietf.org/html/rfc8200#section-4.1



Please clarify what is meant precisely. E.g.:

a) if there is an SRH

b) if there is a IPv6 routing header

c) if there is  an IPv6 extension header

?

....



Given the wording in =A74.2, I would suggest "a". However, the technical qu=
estion remains: are those MSD numbers affected by the presence of another I=
Pv6 extension header (before the SRH)?



---

OLD: This is to prevent inconsistent forwarding entries on SRv6 capable/SRv=
6 incapable routers.





I think the below would be clearer

NEW: This is to prevent inconsistent forwarding entries between SRv6 capabl=
e and SRv6 incapable routers.



----

=A77.1



"

     Type: 27 (Suggested value to be assigned by IANA)



     Length: variable.



     MTID: Multitopology Identifier as defined in [RFC5120<https://tools.ie=
tf.org/html/rfc5120>].

     Note that the value 0 is legal."



Personally I would find clearer to move the above text (describing the SRv6=
 Locator TLV) just after the Figure of the SRv6 Locator TLV.



That would also allow the removal of "Locator entry:" since as a result the=
 text and figures for the local entry would also be grouped together.



----

=A77.1

"Loc-Size: 1 octet. Number of bits in the Locator field."



I think that this is the number of bits of the SRv6 Locator, rather than th=
e number of bits of the field.



Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.



"The Locator is encoded in the minimal number of  octets for the given numb=
er of bits."

Do we want to define the trailing bits? E.g. MUST be sent as zero and ignor=
ed when received.



----

=A78.1 (idem for =A78.2)

I may be missing something...



"All End.X SIDs MUST be a subnet of a Locator with matching topology
   and algorithm which is advertised by the same node in an SRv6 Locator
   TLV. =BB


OK.

So what's the point of advertising a field 'algorithm' in the SRv6 End.X SI=
D sub-TLV? The 128-bits SID allows identifying the Locator, which already a=
dvertise an algorithm.

Advertising again the algorithm with the End.X SID waste space and is an op=
portunity for inconsistency hence additional error handling rules/implement=
ations.



----

=A78.2

"System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined in=
 [ISO10589<https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-=
04#ref-ISO10589>]. =BB



The field seems of fixed length (6 octets) while the encoded System ID seem=
s to be of a variable length. If so, wouldn't it be useful to indicate how =
a System ID of a length shorter than 6 octets is encoded? (in most or least=
 significant octets?).



----

=A79

A priori the sum of all 4 sizes must be 128 bits. Could you specify the err=
or handling when this is not the case? (a choice could be to ignore this Su=
b-Sub-TLV; but given the error handling specified for another error, you se=
em to prefer to ignore the whole parent TLV.

----

=A79

"ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
   its parent sub-TLV.  If it appears more than once in its parent TLV,
   the parent TLV MUST be ignored by the receiver."



In the first sentence, 'parent" refers to the sub-TLV.

In the second sentence, 'parent" refers to the TLV.

I assume that the second sentence should also refers to the parent 'sub-TLV=
' but I'd prefer this be clarified in the text.

----

=A712.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TL=
V"

=A712.5 defines a new IANA registry "Sub-Sub-TLVs for SID Sub-TLVs"



Just checking whether both are needed/intended especially as the second ref=
erences section 7.2. (SRv6 End SID sub-TLV)



Nits:

=3D=3D=3D=3D=3D=3D

Idnits reports 1 error & 1 warning that seem valid : https://tools.ietf.org=
/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions=
-04.txt

---

Page header is " draft-bashandy-isis-srv6-extensions". Probably a better na=
me could be found for the RFC. E.g. IS-IS extensions for SRv6.

---

Proposed

OLD:  a combination of SID's

NEW: a combination of SIDs

---

OLD: is received in both in a

NEW: is received in both a

--

OLD: the this draft

NEW: this draft







-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Wednesday, January 22, 2020 1:15 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Cc: lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>; Christian Hopps; Acee Lindem=
 (acee)
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions



This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions



  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/



Authors please indicate if you aware of any other IPR beyond what is posted=
:



  https://datatracker.ietf.org/ipr/3796/



Thanks,

Chris & Acee.

_______________________________________________

Lsr mailing list

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

https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
______________________________________________



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This message and its attachments may contain confidential or privileged inf=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bruno &#8211;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">ISO 10589 defines/advertises a system ID length whic=
h can be 1-8 octets.<o:p></o:p></p>
<p class=3D"MsoNormal">ISO 10589 also requires that every router in the dom=
ain use the same ID length:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>7.3.15.1 Action on r=
eceipt of a link state PDU<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>&#8230;<o:p></o:p></=
i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i>4)&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If the ID Length field of =
the PDU is not equal to the value of the IS&#8217;s routeingDomainIDLength,=
 the PDU shall be discarded and an iDFieldLengthMismatch event generated.<o=
:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><i><o:p>&nbsp;</o:p></i=
></p>
<p class=3D"MsoNormal">As previously stated, from a practical standpoint, e=
xisting implementations only support a length of 6 &#8211; which is why RFC=
 5305 definition &#8220;works&#8221;. But if there was ever a need to suppo=
rt an ID length other than 6, the TLV definition defined
 in RFC 5305 would still work &#8211; it would just have to be reinterprete=
d to use the ID length defined for the domain.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In most specifications, we try to use ID Length so t=
his issue is more explicitly addressed and I think that is the more preferr=
ed method. So I do not agree that we should use &#8220;6 explicitly&#8221;.=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you want to pursue a clarification regarding RFC =
5305 in this regard you may &#8211; though I hope we could agree this isn&#=
8217;t a high priority issue.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> bruno.decraene@orange.com &lt;bruno.dec=
raene@orange.com&gt;
<br>
<b>Sent:</b> Friday, January 24, 2020 9:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;; lsr@ietf.org=
<br>
<b>Cc:</b> lsr-ads@ietf.org; Christian Hopps &lt;chopps@chopps.org&gt;; Ace=
e Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Subject:</b> RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Les,<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Les=
 Ginsberg (ginsberg) [<a href=3D"mailto:ginsberg@cisco.com">mailto:ginsberg=
@cisco.com</a>]
<br>
<b>Sent:</b> Friday, January 24, 2020 5:39 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org">lsr@ietf=
.org</a><br>
<b>Cc:</b> <a href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; Christ=
ian Hopps; Acee Lindem (acee)<br>
<b>Subject:</b> RE: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Bruno &#8211;<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Regarding<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>&lt;snip&gt;<o:p></o=
:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>=A78.2<o:p></o:p></i=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>&#8220;System-ID: 6 =
octets of IS-IS System-ID of length &quot;ID Length&quot; as defined in [IS=
O10589]. =BB<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><o:p>&nbsp;</o:p></i=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>The field seems of f=
ixed length (6 octets) while the encoded System ID seems to be of a variabl=
e length. If so, wouldn&#8217;t it be useful to indicate how a System ID of=
 a length shorter than 6 octets is encoded?
 (in most or least significant octets?).<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>&lt;end snip&gt;<o:p=
></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">It is well known that &=
#8211; although ISO 10589 supports a system-id length between 1-8 octets &#=
8211; in practice the length 6 is always used. And of course all nodes have=
 to agree to use the same length.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Bruno] Just to clarif=
y, I was asking for consistency between the length of the field (&#8216;6 o=
ctets&#8217;) and the lengths of its content (&#8216;&nbsp; &quot;ID Length=
&quot; as defined in [ISO10589] &#8216;).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">The comparable text fro=
m RFC 8667 Section 2.2.2 says:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>&#8220;Neighbor Syst=
em-ID:&nbsp; IS-IS System-ID of length &quot;ID Length&quot; as<o:p></o:p><=
/i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; defined in [ISO10589].&#8221;<o:p></o:p></i></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><i><o:p>&nbsp;</o:p></i=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">I suggest that the text=
 in this draft be modified to match this &#8211; and the ASCII art text cha=
nges &#8220;6 octets&#8221; to &#8220;ID Length octets&#8221; &#8211; again=
 matching RFC 8667.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Bruno] Looks better a=
s this is consistent. I feel that it could be even better as I still see tw=
o options:<o:p></o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level1 lfo2">
a) If the length of the System ID is fixed to 6, I think that this needs to=
 be indicated in the draft (rather than &#8220;as defined in [ISO10589]&#82=
21; which allows for a variable length).<o:p></o:p></li><li class=3D"MsoLis=
tParagraph" style=3D"color:#1F497D;margin-left:0in;mso-list:l0 level1 lfo2"=
>
b) If the length of the System ID is variable &#8220;as defined in [ISO1058=
9]&#8221;, then I don&#8217;t see how the receiver can know this length and=
 successfully parse the sub-TLV, except may be by looking at another field =
in the LSP<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Looking at RFC 5305, i=
t seems to define/hard code a length of 6 for the ID, which is aligned with=
 option &#8220;a&#8221; and what is much probably meant in this draft.
<a href=3D"https://tools.ietf.org/html/rfc5305#section-3">https://tools.iet=
f.org/html/rfc5305#section-3</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">(That been said RFC 53=
06 (i.e. next RFC) , which you co-author, seems to allow for a variable len=
gth&#8230;.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<pre><span style=3D"color:#1F497D">Hence I would rather propose&nbsp; &#822=
0;</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot=
;">System-ID: 6 octets of IS-IS System-ID&#8221; </span><span style=3D"colo=
r:#1F497D">as per option &#8220;a&#8221;. But I&#8217;m also fine with opti=
on &#8220;b&#8221; if you want.</span><span style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;"><o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">--Bruno<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">I think there is no nee=
d to spend time discussing lengths other than 6.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Would you agree?<o:p></=
o:p></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span lang=3D"FR" style=
=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&nbsp;&nbsp; Les<o:p></=
o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b>From:</b> Lsr &lt;<a=
 href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b><a href=3D"mailto:bruno.decraene@orange.com">bruno.decr=
aene@orange.com</a><br>
<b>Sent:</b> Friday, January 24, 2020 7:25 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; Christ=
ian Hopps &lt;<a href=3D"mailto:chopps@chopps.org">chopps@chopps.org</a>&gt=
;; Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com<=
/a>&gt;<br>
<b>Subject:</b> Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Hi authors, WG,<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I've re-read the dra=
ft. Please find below some minor comments and nits.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Best regards,<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">--Bruno<o:p></o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Minors:<o:p></o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=3D=3D=3D=3D=3D=3D<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&quot; A node indica=
tes that it has support for SRv6 by advertising a new SRv6 Capabilities sub=
-TLV&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I'm not completely c=
ertain that &quot;support for SRv6&quot; is perfectly defined. Do you have =
a reference? Otherwise may be &quot;is an SRv6 Segment Endpoint Node&quot; =
would be better.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Cf <a href=3D"https:=
//tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-3">
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-3</a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A74.3<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&quot;The Maximum H.=
Encaps MSD Type specifies the maximum number of SIDs&nbsp; that can be incl=
uded as part of the &quot;H.Encaps&quot; behavior&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">This is not crystal =
clear to me when the &quot;reduced encapsulation&quot; is used. In such cas=
e we have:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">a) the number of SID=
 included (N)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">b) the number of SID=
 included in the SRH (N-1)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Could you clarify wh=
ich one you are referring to?<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I assume that this i=
s &quot;b&quot; given the text:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&quot;If the adverti=
sed value is zero then the router can apply H.Encaps only by encapsulating =
the incoming packet in another&nbsp; IPv6 header without SRH the same way I=
PinIP encapsulation is performed.&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">But to avoid interop=
 issue, I'd prefer the spec to be non ambiguous. (typically by saying &quot=
;SIDs in a SRH&quot; as indicated in =A74.4<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A74.2<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&quot;in&nbsp; the t=
op SRH in an SRH stack to which the router can apply &quot;PSP&quot; or&nbs=
p; USP&quot; as defined in [I-D.ietf-spring-srv6-network-programming]&nbsp;=
 flavors&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">[I-D.ietf-spring-srv=
6-network-programming] does not define (anymore) &quot;SRH stack&quot;, nor=
 &quot;top SRH&quot;. Please remove those two terms.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A74.4<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&quot;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; If the advertised value is zero or no value is advertised<=
o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; then it is assumed that the router cannot apply<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; &quot;End.DX6&quot; or &quot;End.DT6&quot; behaviors if the exte=
nsion<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; header right underneath the outer IPv6 header is an SRH.&quot;<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">There is no requirem=
ent for the SRH to be &quot;right underneath the outer IPv6 header&quot;.<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Cf <a href=3D"https:=
//tools.ietf.org/html/rfc8200#section-4.1">
https://tools.ietf.org/html/rfc8200#section-4.1</a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Please clarify what =
is meant precisely. E.g.:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">a) if there is an SR=
H<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">b) if there is a IPv=
6 routing header<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">c) if there is&nbsp;=
 an IPv6 extension header<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">?<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">....<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Given the wording in=
 =A74.2, I would suggest &quot;a&quot;. However, the technical question rem=
ains: are those MSD numbers affected by the presence of another IPv6 extens=
ion header (before the SRH)?<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">OLD: This is to prev=
ent inconsistent forwarding entries on SRv6 capable/SRv6 incapable routers.=
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I think the below wo=
uld be clearer<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">NEW: This is to prev=
ent inconsistent forwarding entries between SRv6 capable and SRv6 incapable=
 routers.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A77.1<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&#8220;<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; Type: 27 (Suggested va=
lue to be assigned by IANA)<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; Length: variable.<o:p>=
</o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; MTID: Multitopology Id=
entifier as defined in [</span><span lang=3D"FR" style=3D"font-size:10.0pt;=
font-family:&quot;Courier New&quot;"><a href=3D"https://tools.ietf.org/html=
/rfc5120" title=3D"&quot;M-ISIS: Multi Topology (MT) Routing in Intermediat=
e System to Intermediate Systems (IS-ISs)&quot;"><span lang=3D"EN-US">RFC51=
20</span></a></span><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">].<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; Note that the value 0 =
is legal.&#8221;<o:p></o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Personally I would f=
ind clearer to move the above text (describing the SRv6 Locator TLV) just a=
fter the Figure of the SRv6 Locator TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">That would also allo=
w the removal of &#8220;Locator entry:&#8221; since as a result the text an=
d figures for the local entry would also be grouped together.<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">=A77.1<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&#8220;Loc-Size: 1 octet. Number of bits in the=
 Locator field.&#8221;<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I think that this is=
 the number of bits of the SRv6 Locator, rather than the number of bits of =
the field.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Proposed NEW: Loc-Si=
ze: 1 octet. Number of bits in the SRv6 Locator.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&#8220;The Locator i=
s encoded in the minimal number of&nbsp; octets for the given number of bit=
s.&#8221;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Do we want to define=
 the trailing bits? E.g. MUST be sent as zero and ignored when received.<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A78.1 (idem for =A7=
8.2)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I may be missing som=
ething&#8230;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&#8220;All End.X SIDs MUST be a subnet of a Loc=
ator with matching topology<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;">&nbsp;&nbsp; and algorithm wh=
ich is advertised by the same node in an SRv6 Locator<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;">&nbsp;&nbsp;
</span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Courie=
r New&quot;">TLV.&nbsp;=BB<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR" style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p>=
</span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">OK. <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">So what&#8217;s the =
point of advertising a field &#8216;algorithm&#8217; in the SRv6 End.X SID =
sub-TLV? The 128-bits SID allows identifying the Locator, which already adv=
ertise an algorithm.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Advertising again th=
e algorithm with the End.X SID waste space and is an opportunity for incons=
istency hence additional error handling rules/implementations.<o:p></o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A78.2<o:p></o:p></p=
>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&#8220;System-ID: 6 octets of IS-IS System-ID o=
f length &quot;ID Length&quot; as defined in [</span><span lang=3D"FR" styl=
e=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;"><a href=3D"https=
://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04#ref-ISO10589"=
 title=3D"&quot;, I. &quot;"><span lang=3D"EN-US">ISO10589</span></a></span=
><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">].&nb=
sp;=BB<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">The field seems of f=
ixed length (6 octets) while the encoded System ID seems to be of a variabl=
e length. If so, wouldn&#8217;t it be useful to indicate how a System ID of=
 a length shorter than 6 octets is encoded?
 (in most or least significant octets?).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A79<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">A priori the sum of =
all 4 sizes must be 128 bits. Could you specify the error handling when thi=
s is not the case? (a choice could be to ignore this Sub-Sub-TLV; but given=
 the error handling specified for another
 error, you seem to prefer to ignore the whole parent TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A79<o:p></o:p></p>
<pre style=3D"margin-left:35.4pt"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">&#8220;ISIS SRv6 SID Structure Sub-Sub-TLV MUST=
 NOT appear more than once in<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;">&nbsp;&nbsp; its parent sub-T=
LV.&nbsp; If it appears more than once in its parent TLV,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Courier New&quot;">&nbsp;&nbsp; the parent TLV M=
UST be ignored by the receiver.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">In the first sentenc=
e, &#8216;parent&#8221; refers to the sub-TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">In the second senten=
ce, &#8216;parent&#8221; refers to the TLV.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">I assume that the se=
cond sentence should also refers to the parent &#8216;sub-TLV&#8217; but I&=
#8217;d prefer this be clarified in the text.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A712.1.1 defines a =
new IANA registry &quot;sub-sub-TLVs for SRv6 End SID sub-TLV&quot;<o:p></o=
:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=A712.5 defines a ne=
w IANA registry &#8220;Sub-Sub-TLVs for SID Sub-TLVs&#8221;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Just checking whethe=
r both are needed/intended especially as the second references section 7.2.=
 (SRv6 End SID sub-TLV)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Nits:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">=3D=3D=3D=3D=3D=3D<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Idnits reports 1 err=
or &amp; 1 warning that seem valid :
<a href=3D"https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/dr=
aft-ietf-lsr-isis-srv6-extensions-04.txt">
https://tools.ietf.org/idnits?url=3Dhttps://tools.ietf.org/id/draft-ietf-ls=
r-isis-srv6-extensions-04.txt</a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Page header is &quot=
; draft-bashandy-isis-srv6-extensions&quot;. Probably a better name could b=
e found for the RFC. E.g. IS-IS extensions for SRv6.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Proposed<o:p></o:p><=
/p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">OLD:&nbsp; a combina=
tion of SID's<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">NEW: a combination o=
f SIDs<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">---<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">OLD: is received in =
both in a<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">NEW: is received in =
both a<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">--<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">OLD: the this draft<=
o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">NEW: this draft<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">-----Original Messag=
e-----<br>
From: Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:lsr-bounces@ietf.=
org</a>] On Behalf Of Christian Hopps<br>
Sent: Wednesday, January 22, 2020 1:15 AM<br>
To: <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
Cc: <a href=3D"mailto:lsr-ads@ietf.org">lsr-ads@ietf.org</a>; Christian Hop=
ps; Acee Lindem (acee)<br>
Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions<o:p></o:p><=
/p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">This begins a 2 week=
 WG Last Call, ending after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-exten=
sions<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&nbsp; <a href=3D"ht=
tps://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/">
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a><o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Authors please indic=
ate if you aware of any other IPR beyond what is posted:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">&nbsp; <a href=3D"ht=
tps://datatracker.ietf.org/ipr/3796/">
https://datatracker.ietf.org/ipr/3796/</a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Thanks,<o:p></o:p></=
p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Chris &amp; Acee.<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">____________________=
___________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt">Lsr mailing list<o:p=
></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><a href=3D"mailto:Ls=
r@ietf.org">Lsr@ietf.org</a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><a href=3D"https://w=
ww.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr=
</a><o:p></o:p></p>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">___________________________________=
___________________________________________________________________________=
___________<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">Ce message et ses pieces jointes pe=
uvent contenir des informations confidentielles ou privilegiees et ne doive=
nt donc<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">pas etre diffuses, exploites ou cop=
ies sans autorisation. Si vous avez recu ce message par erreur, veuillez le=
 signaler<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">a l'expediteur et le detruire ainsi=
 que les pieces jointes. Les messages electroniques etant susceptibles d'al=
teration,<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">Orange decline toute responsabilite=
 si ce message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">This message and its attachments ma=
y contain confidential or privileged information that may be protected by l=
aw;<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">they should not be distributed, use=
d or copied without authorisation.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">If you have received this email in =
error, please notify the sender and delete this message and its attachments=
.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">As emails may be altered, Orange is=
 not liable for messages that have been modified, changed or falsified.<o:p=
></o:p></span></pre>
<pre style=3D"margin-left:35.4pt"><span lang=3D"FR" style=3D"font-size:10.0=
pt;font-family:&quot;Courier New&quot;">Thank you.<o:p></o:p></span></pre>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
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From: Yingzhen Qu <yingzhen.qu@futurewei.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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CC: Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>, lsr-ads <lsr-ads@ietf.org>, draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>
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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: lsr-ads <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Support.

Thanks,
Shunwan

From:Christian Hopps <chopps@chopps.org<mailto:chopps@chopps.org>>
To:lsr <lsr@ietf.org<mailto:lsr@ietf.org>>
Cc:lsr-ads <lsr-ads@ietf.org<mailto:lsr-ads@ietf.org>>;Christian Hopps <cho=
pps@chopps.org<mailto:chopps@chopps.org>>;Acee Lindem (acee) <acee@cisco.co=
m<mailto:acee@cisco.com>>
Date:2020-01-22 08:15:24
Subject:[Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions

This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf=
-lsr-isis-srv6-extensions

  https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

Authors please indicate if you aware of any other IPR beyond what is posted=
:

  https://datatracker.ietf.org/ipr/3796/

Thanks,
Chris & Acee.
_______________________________________________
Lsr mailing list
Lsr@ietf.org<mailto:Lsr@ietf.org>
https://www.ietf.org/mailman/listinfo/lsr

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt">Supp=
ort.&nbsp;<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
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n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt">Than=
ks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt">Shun=
wan<o:p></o:p></span></p>
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<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">From:</span></b><span lang=3D"EN-US">Christian Hopps &lt;<a href=3D"mail=
to:chopps@chopps.org">chopps@chopps.org</a>&gt;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">To:</span></b><span lang=3D"EN-US">lsr &lt;<a href=3D"mailto:lsr@ietf.or=
g">lsr@ietf.org</a>&gt;<o:p></o:p></span></p>
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<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">Cc:</span></b><span lang=3D"EN-US">lsr-ads &lt;<a href=3D"mailto:lsr-ads=
@ietf.org">lsr-ads@ietf.org</a>&gt;;Christian Hopps &lt;<a href=3D"mailto:c=
hopps@chopps.org">chopps@chopps.org</a>&gt;;Acee Lindem
 (acee) &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;<o:p></=
o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">Date:</span></b><span lang=3D"EN-US">2020-01-22 08:15:24<o:p></o:p></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"word-break:break-all"><b><span lang=3D"EN-U=
S">Subject:</span></b><span lang=3D"EN-US">[Lsr] WG Last Call draft-ietf-ls=
r-isis-srv6-extensions<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt">This=
 begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf-lsr=
-isis-srv6-extensions<br>
<br>
&nbsp; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6=
-extensions/">
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a><b=
r>
<br>
Authors please indicate if you aware of any other IPR beyond what is posted=
:<br>
<br>
&nbsp; <a href=3D"https://datatracker.ietf.org/ipr/3796/">https://datatrack=
er.ietf.org/ipr/3796/</a><br>
<br>
Thanks,<br>
Chris &amp; Acee.<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/=
mailman/listinfo/lsr</a><o:p></o:p></span></p>
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--_000_19AB2A007F56DB4E8257F949A2FB9858E5F9E0D0NKGEML515MBXchi_--


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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Hi Bruno,

please see inline (##PP):

On 24/01/2020 16:24, bruno.decraene@orange.com wrote:
> Hi authors, WG,
> 
> I've re-read the draft. Please find below some minor comments and nits.
> 
> Best regards,
> 
> --Bruno
> 
> Minors:
> 
> ======
> 
> " A node indicates that it has support for SRv6 by advertising a new 
> SRv6 Capabilities sub-TLV"
> 
> I'm not completely certain that "support for SRv6" is perfectly defined. 
> Do you have a reference? Otherwise may be "is an SRv6 Segment Endpoint 
> Node" would be better.
> 
> Cfhttps://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-3

##PP
I changed to "SR Segment Endpoint Node"



> 
> ---
> 
> §4.3
> 
> "The Maximum H.Encaps MSD Type specifies the maximum number of SIDsthat 
> can be included as part of the "H.Encaps" behavior"
> 
> This is not crystal clear to me when the "reduced encapsulation" is 
> used. In such case we have:
> 
> a) the number of SID included (N)
> 
> b) the number of SID included in the SRH (N-1)
> 
> Could you clarify which one you are referring to?
> 
> I assume that this is "b" given the text:
> 
> "If the advertised value is zero then the router can apply H.Encaps only 
> by encapsulating the incoming packet in anotherIPv6 header without SRH 
> the same way IPinIP encapsulation is performed."
> 
> But to avoid interop issue, I'd prefer the spec to be non ambiguous. 
> (typically by saying "SIDs in a SRH" as indicated in §4.4

##PP
the Maximum H.Encaps MSD Type specifies the maximum number of segments 
that a node can use as part of the encapsulation operation, regardless 
of whether that is H.Encaps or H.Encaps.Red. If the node advertises N it 
can either do H.Encaps with N SIDs in SRH or do H.Encaps.Red with (N-1) 
in the SRH +1 in the IPv6 DA.


> 
> ---
> 
> §4.2
> 
> "inthe top SRH in an SRH stack to which the router can apply "PSP" 
> orUSP" as defined in [I-D.ietf-spring-srv6-network-programming]flavors"
> 
> [I-D.ietf-spring-srv6-network-programming] does not define (anymore) 
> "SRH stack", nor "top SRH". Please remove those two terms.


##PP
Changed to:

"The Maximum End Pop MSD Type specifies the maximum number of SIDs in
the SRH to which the router can apply "PSP" or USP" behavior, as defined 
in [I-D.ietf-spring-srv6-network-programming] flavors."

> 
> ---
> 
> §4.4
> 
> "If the advertised value is zero or no value is advertised
> 
> then it is assumed that the router cannot apply
> 
> "End.DX6" or "End.DT6" behaviors if the extension
> 
> header right underneath the outer IPv6 header is an SRH."
> 
> There is no requirement for the SRH to be "right underneath the outer 
> IPv6 header".

##PP
Changed to:

"If the advertised value is zero or no value is advertised
then it is assumed that the router cannot apply
"End.DX6" or "End.DT6" behaviors if the outer IPv6 header contains an SRH."


> 
> Cfhttps://tools.ietf.org/html/rfc8200#section-4.1
> 
> Please clarify what is meant precisely. E.g.:
> 
> a) if there is an SRH
> 
> b) if there is a IPv6 routing header
> 
> c) if there isan IPv6 extension header
> 
> ?
> 
> ....
> 
> Given the wording in §4.2, I would suggest "a". However, the technical 
> question remains: are those MSD numbers affected by the presence of 
> another IPv6 extension header (before the SRH)?

##PP
no, the presence of another IPv6 extension header has no impact on the 
MSDs we define here.

> 
> ---
> 
> OLD: This is to prevent inconsistent forwarding entries on SRv6 
> capable/SRv6 incapable routers.
> 
> I think the below would be clearer
> 
> NEW: This is to prevent inconsistent forwarding entries between SRv6 
> capable and SRv6 incapable routers.

##PP
fixed as suggested.

> 
> ----
> 
> §7.1
> 
> “
> 
> Type: 27 (Suggested value to be assigned by IANA)
> 
> Length: variable.
> 
> MTID: Multitopology Identifier as defined in [RFC5120  <https://tools.ietf.org/html/rfc5120>].
> 
> Note that the value 0 is legal.”
> 
> Personally I would find clearer to move the above text (describing the 
> SRv6 Locator TLV) just after the Figure of the SRv6 Locator TLV.
> 
> That would also allow the removal of “Locator entry:” since as a result 
> the text and figures for the local entry would also be grouped together.

##PP
done.


> 
> ----
> 
> §7.1
> 
> “Loc-Size: 1 octet. Number of bits in the Locator field.”
> 
> I think that this is the number of bits of the SRv6 Locator, rather than 
> the number of bits of the field.
> 
> Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.

##PP
done

> 
> “The Locator is encoded in the minimal number ofoctets for the given 
> number of bits.”
> 
> Do we want to define the trailing bits? E.g. MUST be sent as zero and 
> ignored when received.

##PP
done

> 
> ----
> 
> §8.1 (idem for §8.2)
> 
> I may be missing something…
> 
> “All End.X SIDs MUST be a subnet of a Locator with matching topology
> 
> and algorithm which is advertised by the same node in an SRv6 Locator
> 
> TLV. »
> 
> OK.
> 
> So what’s the point of advertising a field ‘algorithm’ in the SRv6 End.X 
> SID sub-TLV? The 128-bits SID allows identifying the Locator, which 
> already advertise an algorithm.
> 
> Advertising again the algorithm with the End.X SID waste space and is an 
> opportunity for inconsistency hence additional error handling 
> rules/implementations.


##PP

Having an algo field advertised with the END.X/LAN END.x SIDs:

1. Makes it easier for implementation to find the algo specific END.X 
SID without making the longest prefix match on all locators advertised 
by the node to find the algo to which the SID belongs.

2. Contrary to what you said, it makes it possible to verify that the 
algorithm associated with the END.X SID matches that of the covering 
Locator.

> 
> ----
> 
> §8.2
> 
> “System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined 
> in [ISO10589  <https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04#ref-ISO10589>]. »
> 
> The field seems of fixed length (6 octets) while the encoded System ID 
> seems to be of a variable length. If so, wouldn’t it be useful to 
> indicate how a System ID of a length shorter than 6 octets is encoded? 
> (in most or least significant octets?).

##PP
Les has responded to the above.

> 
> ----
> 
> §9
> 
> A priori the sum of all 4 sizes must be 128 bits. Could you specify the 
> error handling when this is not the case? (a choice could be to ignore 
> this Sub-Sub-TLV; but given the error handling specified for another 
> error, you seem to prefer to ignore the whole parent TLV.

##PP
the sum may not need to be 128, some fields may be advertised as 0 - 
e.g. not all SIDs have arguments.

> 
> ----
> 
> §9
> 
> “ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
> 
> its parent sub-TLV.If it appears more than once in its parent TLV,
> 
> the parent TLV MUST be ignored by the receiver.”
> 
> In the first sentence, ‘parent” refers to the sub-TLV.
> 
> In the second sentence, ‘parent” refers to the TLV.
> 
> I assume that the second sentence should also refers to the parent 
> ‘sub-TLV’ but I’d prefer this be clarified in the text.


##PP
fixed.


> 
> ----
> 
> §12.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TLV"
> 
> §12.5 defines a new IANA registry “Sub-Sub-TLVs for SID Sub-TLVs”
> 
> Just checking whether both are needed/intended especially as the second 
> references section 7.2. (SRv6 End SID sub-TLV)

##PP
this was a duplication, I have removed the part from the section 12.1.1.

> 
> Nits:
> 
> ======
> 
> Idnitsreports 1 error & 1 warning that seem valid : 
> https://tools.ietf.org/idnits?url=https://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions-04.txt
> 
> ---
> 
> Page header is " draft-bashandy-isis-srv6-extensions". Probably a better 
> name could be found for the RFC. E.g. IS-IS extensions for SRv6.

##PP
fixed

> 
> ---
> 
> Proposed
> 
> OLD:a combination of SID's
> 
> NEW: a combination of SIDs
> 
> ---
> 
> OLD: is received in both in a
> 
> NEW: is received in both a
> 
> --
> 
> OLD: the this draft
> 
> NEW: this draft

##PP
fixed all of the above.

thanks,
Peter


> 
> -----Original Message-----
> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
> Sent: Wednesday, January 22, 2020 1:15 AM
> To: lsr@ietf.org
> Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
> Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
> 
> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for 
> draft-ietf-lsr-isis-srv6-extensions
> 
> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
> 
> Authors please indicate if you aware of any other IPR beyond what is posted:
> 
> https://datatracker.ietf.org/ipr/3796/
> 
> Thanks,
> 
> Chris & Acee.
> 
> _______________________________________________
> 
> Lsr mailing list
> 
> Lsr@ietf.org
> 
> https://www.ietf.org/mailman/listinfo/lsr
> 
> _________________________________________________________________________________________________________________________
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Hi Bruno,

On 28/01/2020 18:05, bruno.decraene@orange.com wrote:
> Hi Peter,
> 
> Thank you.
> Looks good.
> 
> Just one follow up
> 
>>> §9
>>>
>>> A priori the sum of all 4 sizes must be 128 bits. Could you specify the
>>> error handling when this is not the case? (a choice could be to ignore
>>> this Sub-Sub-TLV; but given the error handling specified for another
>>> error, you seem to prefer to ignore the whole parent TLV.
>>
>> ##PP
>> the sum may not need to be 128, some fields may be advertised as 0 -
>> e.g. not all SIDs have arguments.
> 
> You are correct.
> Let me rephrase:
> 
> A priori the sum of all 4 sizes must be lower or equal 128 bits.
> Could you specify the error handling when this is not the case?
> Especially since there seem to be two possible responses:
> a) ignore this Sub-Sub-TLV
> b) ignore the whole parent TLV (as specified for another error condition)

I would go for (b) and ignore the parent sub-TLV.
Will update accordingly.

thanks,
Peter



> 
> Thank you
> --Bruno
> 
>> -----Original Message-----
>> From: Peter Psenak [mailto:ppsenak@cisco.com]
>> Sent: Monday, January 27, 2020 1:43 PM
>> To: DECRAENE Bruno TGI/OLN; lsr@ietf.org
>> Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
>> Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
>>
>> Hi Bruno,
>>
>> please see inline (##PP):
>>
>> On 24/01/2020 16:24, bruno.decraene@orange.com wrote:
>>> Hi authors, WG,
>>>
>>> I've re-read the draft. Please find below some minor comments and nits.
>>>
>>> Best regards,
>>>
>>> --Bruno
>>>
>>> Minors:
>>>
>>> ======
>>>
>>> " A node indicates that it has support for SRv6 by advertising a new
>>> SRv6 Capabilities sub-TLV"
>>>
>>> I'm not completely certain that "support for SRv6" is perfectly defined.
>>> Do you have a reference? Otherwise may be "is an SRv6 Segment Endpoint
>>> Node" would be better.
>>>
>>> Cfhttps://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-3
>>
>> ##PP
>> I changed to "SR Segment Endpoint Node"
>>
>>
>>
>>>
>>> ---
>>>
>>> §4.3
>>>
>>> "The Maximum H.Encaps MSD Type specifies the maximum number of SIDsthat
>>> can be included as part of the "H.Encaps" behavior"
>>>
>>> This is not crystal clear to me when the "reduced encapsulation" is
>>> used. In such case we have:
>>>
>>> a) the number of SID included (N)
>>>
>>> b) the number of SID included in the SRH (N-1)
>>>
>>> Could you clarify which one you are referring to?
>>>
>>> I assume that this is "b" given the text:
>>>
>>> "If the advertised value is zero then the router can apply H.Encaps only
>>> by encapsulating the incoming packet in anotherIPv6 header without SRH
>>> the same way IPinIP encapsulation is performed."
>>>
>>> But to avoid interop issue, I'd prefer the spec to be non ambiguous.
>>> (typically by saying "SIDs in a SRH" as indicated in §4.4
>>
>> ##PP
>> the Maximum H.Encaps MSD Type specifies the maximum number of segments
>> that a node can use as part of the encapsulation operation, regardless
>> of whether that is H.Encaps or H.Encaps.Red. If the node advertises N it
>> can either do H.Encaps with N SIDs in SRH or do H.Encaps.Red with (N-1)
>> in the SRH +1 in the IPv6 DA.
>>
>>
>>>
>>> ---
>>>
>>> §4.2
>>>
>>> "inthe top SRH in an SRH stack to which the router can apply "PSP"
>>> orUSP" as defined in [I-D.ietf-spring-srv6-network-programming]flavors"
>>>
>>> [I-D.ietf-spring-srv6-network-programming] does not define (anymore)
>>> "SRH stack", nor "top SRH". Please remove those two terms.
>>
>>>
>>> ##PP
>>> Changed to:
>>>
>>> "The Maximum End Pop MSD Type specifies the maximum number of SIDs in
>>> the SRH to which the router can apply "PSP" or USP" behavior, as defined
>>> in [I-D.ietf-spring-srv6-network-programming] flavors."
>>>
>>>>
>>>> ---
>>>>
>>>> §4.4
>>>>
>>>> "If the advertised value is zero or no value is advertised
>>>>
>>>> then it is assumed that the router cannot apply
>>>>
>>>> "End.DX6" or "End.DT6" behaviors if the extension
>>>>
>>>> header right underneath the outer IPv6 header is an SRH."
>>>>
>>>> There is no requirement for the SRH to be "right underneath the outer
>>>> IPv6 header".
>>>
>>> ##PP
>>> Changed to:
>>>
>>> "If the advertised value is zero or no value is advertised
>>> then it is assumed that the router cannot apply
>>> "End.DX6" or "End.DT6" behaviors if the outer IPv6 header contains an SRH."
>>>
>>>
>>>>
>>>> Cfhttps://tools.ietf.org/html/rfc8200#section-4.1
>>>>
>>>> Please clarify what is meant precisely. E.g.:
>>>>
>>>> a) if there is an SRH
>>>>
>>>> b) if there is a IPv6 routing header
>>>>
>>>> c) if there isan IPv6 extension header
>>>>
>>>> ?
>>>>
>>>> ....
>>>>
>>>> Given the wording in §4.2, I would suggest "a". However, the technical
>>>> question remains: are those MSD numbers affected by the presence of
>>>> another IPv6 extension header (before the SRH)?
>>>
>>> ##PP
>>> no, the presence of another IPv6 extension header has no impact on the
>>> MSDs we define here.
>>>
>>>>
>>>> ---
>>>>
>>>> OLD: This is to prevent inconsistent forwarding entries on SRv6
>>>> capable/SRv6 incapable routers.
>>>>
>>>> I think the below would be clearer
>>>>
>>>> NEW: This is to prevent inconsistent forwarding entries between SRv6
>>>> capable and SRv6 incapable routers.
>>>
>>> ##PP
>>> fixed as suggested.
>>>
>>>>
>>>> ----
>>>>
>>>> §7.1
>>>>
>>>> “
>>>>
>>>> Type: 27 (Suggested value to be assigned by IANA)
>>>>
>>>> Length: variable.
>>>>
>>>> MTID: Multitopology Identifier as defined in [RFC5120  <https://tools.ietf.org/html/rfc5120>].
>>>>
>>>> Note that the value 0 is legal.”
>>>>
>>>> Personally I would find clearer to move the above text (describing the
>>>> SRv6 Locator TLV) just after the Figure of the SRv6 Locator TLV.
>>>>
>>>> That would also allow the removal of “Locator entry:” since as a result
>>>> the text and figures for the local entry would also be grouped together.
>>>
>>> ##PP
>>> done.
>>>
>>>
>>>>
>>>> ----
>>>>
>>>> §7.1
>>>>
>>>> “Loc-Size: 1 octet. Number of bits in the Locator field.”
>>>>
>>>> I think that this is the number of bits of the SRv6 Locator, rather than
>>>> the number of bits of the field.
>>>>
>>>> Proposed NEW: Loc-Size: 1 octet. Number of bits in the SRv6 Locator.
>>>
>>> ##PP
>>> done
>>>
>>>>
>>>> “The Locator is encoded in the minimal number ofoctets for the given
>>>> number of bits.”
>>>>
>>>> Do we want to define the trailing bits? E.g. MUST be sent as zero and
>>>> ignored when received.
>>>
>>> ##PP
>>> done
>>>
>>>>
>>>> ----
>>>>
>>>> §8.1 (idem for §8.2)
>>>>
>>>> I may be missing something…
>>>>
>>>> “All End.X SIDs MUST be a subnet of a Locator with matching topology
>>>>
>>>> and algorithm which is advertised by the same node in an SRv6 Locator
>>>>
>>>> TLV. »
>>>>
>>>> OK.
>>>>
>>>> So what’s the point of advertising a field ‘algorithm’ in the SRv6 End.X
>>>> SID sub-TLV? The 128-bits SID allows identifying the Locator, which
>>>> already advertise an algorithm.
>>>>
>>>> Advertising again the algorithm with the End.X SID waste space and is an
>>>> opportunity for inconsistency hence additional error handling
>>>> rules/implementations.
>>>
>>>
>>> ##PP
>>>
>>> Having an algo field advertised with the END.X/LAN END.x SIDs:
>>>
>>> 1. Makes it easier for implementation to find the algo specific END.X
>>> SID without making the longest prefix match on all locators advertised
>>> by the node to find the algo to which the SID belongs.
>>>
>>> 2. Contrary to what you said, it makes it possible to verify that the
>>> algorithm associated with the END.X SID matches that of the covering
>>> Locator.
>>>
>>>>
>>>> ----
>>>>
>>>> §8.2
>>>>
>>>> “System-ID: 6 octets of IS-IS System-ID of length "ID Length" as defined
>>>> in [ISO10589  <https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-04#ref-ISO10589>]. »
>>>>
>>>> The field seems of fixed length (6 octets) while the encoded System ID
>>>> seems to be of a variable length. If so, wouldn’t it be useful to
>>>> indicate how a System ID of a length shorter than 6 octets is encoded?
>>>> (in most or least significant octets?).
>>>
>>> ##PP
>>> Les has responded to the above.
>>>
>>>>
>>>> ----
>>>>
>>>> §9
>>>>
>>>> A priori the sum of all 4 sizes must be 128 bits. Could you specify the
>>>> error handling when this is not the case? (a choice could be to ignore
>>>> this Sub-Sub-TLV; but given the error handling specified for another
>>>> error, you seem to prefer to ignore the whole parent TLV.
>>>
>>> ##PP
>>> the sum may not need to be 128, some fields may be advertised as 0 -
>>> e.g. not all SIDs have arguments.
>>>
>>>>
>>>> ----
>>>>
>>>> §9
>>>>
>>>> “ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
>>>>
>>>> its parent sub-TLV.If it appears more than once in its parent TLV,
>>>>
>>>> the parent TLV MUST be ignored by the receiver.”
>>>>
>>>> In the first sentence, ‘parent” refers to the sub-TLV.
>>>>
>>>> In the second sentence, ‘parent” refers to the TLV.
>>>>
>>>> I assume that the second sentence should also refers to the parent
>>>> ‘sub-TLV’ but I’d prefer this be clarified in the text.
>>>
>>>
>>> ##PP
>>> fixed.
>>>
>>>
>>>>
>>>> ----
>>>>
>>>> §12.1.1 defines a new IANA registry "sub-sub-TLVs for SRv6 End SID sub-TLV"
>>>>
>>>> §12.5 defines a new IANA registry “Sub-Sub-TLVs for SID Sub-TLVs”
>>>>
>>>> Just checking whether both are needed/intended especially as the second
>>>> references section 7.2. (SRv6 End SID sub-TLV)
>>>
>>> ##PP
>>> this was a duplication, I have removed the part from the section 12.1.1.
>>>
>>>>
>>>> Nits:
>>>>
>>>> ======
>>>>
>>>> Idnitsreports 1 error & 1 warning that seem valid :
>>>> https://tools.ietf.org/idnits?url=https://tools.ietf.org/id/draft-ietf-lsr-isis-srv6-extensions-04.txt
>>>>
>>>> ---
>>>>
>>>> Page header is " draft-bashandy-isis-srv6-extensions". Probably a better
>>>> name could be found for the RFC. E.g. IS-IS extensions for SRv6.
>>>
>>> ##PP
>>> fixed
>>>
>>>>
>>>> ---
>>>>
>>>> Proposed
>>>>
>>>> OLD:a combination of SID's
>>>>
>>>> NEW: a combination of SIDs
>>>>
>>>> ---
>>>>
>>>> OLD: is received in both in a
>>>>
>>>> NEW: is received in both a
>>>>
>>>> --
>>>>
>>>> OLD: the this draft
>>>>
>>>> NEW: this draft
>>>
>>> ##PP
>>> fixed all of the above.
>>>
>>> thanks,
>>> Peter
>>>
>>>
>>>>
>>>> -----Original Message-----
>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
>>>> Sent: Wednesday, January 22, 2020 1:15 AM
>>>> To: lsr@ietf.org
>>>> Cc: lsr-ads@ietf.org; Christian Hopps; Acee Lindem (acee)
>>>> Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
>>>>
>>>> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for
>>>> draft-ietf-lsr-isis-srv6-extensions
>>>>
>>>> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
>>>>
>>>> Authors please indicate if you aware of any other IPR beyond what is posted:
>>>>
>>>> https://datatracker.ietf.org/ipr/3796/
>>>>
>>>> Thanks,
>>>>
>>>> Chris & Acee.
>>>>
>>>> _______________________________________________
>>>>
>>>> Lsr mailing list
>>>>
>>>> Lsr@ietf.org
>>>>
>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>
>>>> _________________________________________________________________________________________________________________________
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> 
> 
> 
> _________________________________________________________________________________________________________________________
> 
> 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. Si vous avez recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
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> 
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From nobody Tue Jan 28 18:56:31 2020
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CC: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Support.

Thanks,
Shunwan

-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Friday, January 24, 2020 4:25 AM
To: lsr@ietf.org
Cc: draft-li-lsr-ospfv3-srv6-extensions@ietf.org; lsr-ads@ietf.org; Christi=
an Hopps <chopps@chopps.org>; Acee Lindem (acee) <acee@cisco.com>
Subject: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions

Hi LSR WG and Draft Authors,

The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...

This begins a 2 week WG adoption poll for the following draft:

  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
=20
Please indicate your support or objection by Feb 6, 2020.

Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.

Thanks,
Chris & Acee.
_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: Tony Przygienda <tonysietf@gmail.com>
Date: Tue, 28 Jan 2020 20:58:00 -0800
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Subject: Re: [Lsr] IS-IS Requirements for Area Abstraction (Corrected Alias for ADs)
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please do not co-mingle hierarchical ISIS and flood reduction drafts into
this discussion. Albeit seemingly related the ttz/abstract/flood-reflector
drafts solve a different, valid problem of multiple large operators that
hierachical,flood-reduce cannot solve albeit they can be used @ the same
time. RFC1925 section 5

thanks

--- tony

On Mon, Jan 27, 2020 at 11:42 AM Alvaro Retana <aretana.ietf@gmail.com>
wrote:

> FYI=E2=80=A6
>
> Because I am one of the co-authors of draft-chen-isis-ttz, I am recusing
> myself from this discussion.  Martin will be the responsible AD for it,
> should one be needed.
>
> Alvaro.
>
> On January 27, 2020 at 1:27:13 PM, Acee Lindem (acee) (acee@cisco.com)
> wrote:
>
> Speaking as WG Co-chair:
>
>
>
> At IETF 107, we had a protracted discussion of several drafts having  goa=
l
> of reducing the amount of link-state information that must be flooded int=
o
> the level-2 area. We have two drafts that do this essentially via
> abstraction of the level-1 areas. These are:
>
>
>
> https://www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt
>
> https://www.ietf.org/id/draft-chen-isis-ttz-07.txt
>
>
>
> There are various reasons why these drafts can=E2=80=99t consolidated inv=
olving
> both IPR and government restrictions. Refer to
> https://datatracker.ietf.org/meeting/106/materials/minutes-106-lsr-00 for
> the complete discussion.
>
>
>
> We have another draft that also reduces the amount of link-state
> information each IS-IS router must maintain but using IS-IS reflectors.
> This is slightly different but also avoids leaking all the level-1 area
> link-state to the level-2 area.
>
>
>
> https://www.ietf.org/id/draft-przygienda-lsr-flood-reflection-01.txt
>
>
>
> Given the amount of overlap and the conflicts amongst these drafts, the
> chairs/Ads are now asking whether there is a really a strong requirement =
to
> advance one or more of these documents. Especially given that we are
> already moving forward with both IS-IS/OSPF flooding reductions and the
> Hierarchal IS-IS work. Additionally,  we anticipate we=E2=80=99ll reach a=
n impasse
> in consolidating these drafts. We=E2=80=99d really like to hear from the =
operators
> that would deploy these mechanisms.
>
>
>
> Thanks,
> Acee and Chris
>
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--000000000000b17de3059d403362
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>please do not co-mingle hierarchical ISIS and flood r=
eduction drafts into this discussion. Albeit seemingly related the ttz/abst=
ract/flood-reflector drafts solve a different, valid problem of multiple la=
rge operators that hierachical,flood-reduce cannot solve albeit they can be=
 used @ the same time. RFC1925 section 5<br></div><div><br></div><div>thank=
s <br></div><div><br></div><div>--- tony<br></div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jan 27, 2020 at 1=
1:42 AM Alvaro Retana &lt;<a href=3D"mailto:aretana.ietf@gmail.com">aretana=
.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div style=3D"overflow-wrap: break-word;"><div style=3D"font=
-family:Helvetica,Arial;font-size:13px">FYI=E2=80=A6</div><div style=3D"fon=
t-family:Helvetica,Arial;font-size:13px"><br></div><div style=3D"font-famil=
y:Helvetica,Arial;font-size:13px">Because I am one of the co-authors of dra=
ft-chen-isis-ttz, I am recusing myself from this discussion.=C2=A0 Martin w=
ill be the responsible AD for it, should one be needed.</div><div style=3D"=
font-family:Helvetica,Arial;font-size:13px"><br></div><div style=3D"font-fa=
mily:Helvetica,Arial;font-size:13px">Alvaro.=C2=A0</div> <br><p>On January =
27, 2020 at 1:27:13 PM, Acee Lindem (acee) (<a href=3D"mailto:acee@cisco.co=
m" target=3D"_blank">acee@cisco.com</a>) wrote:</p> <blockquote type=3D"cit=
e"><span><div lang=3D"EN-US"><div></div><div>






<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Speaking as WG Co-cha=
ir:</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">At IETF 107, we had a=
 protracted discussion of several drafts having =C2=A0goal of reducing the =
amount of link-state information that must be flooded into the level-2 area=
. We have two drafts that do this essentially
 via abstraction of the level-1 areas. These are: </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><a href=3D"https://ww=
w.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt" target=3D"_blank">https:=
//www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt</a></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><a href=3D"https://ww=
w.ietf.org/id/draft-chen-isis-ttz-07.txt" target=3D"_blank">https://www.iet=
f.org/id/draft-chen-isis-ttz-07.txt</a></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">There are various rea=
sons why these drafts can=E2=80=99t consolidated involving both IPR and gov=
ernment restrictions. Refer to
<a href=3D"https://datatracker.ietf.org/meeting/106/materials/minutes-106-l=
sr-00" target=3D"_blank">https://datatracker.ietf.org/meeting/106/materials=
/minutes-106-lsr-00</a> for the complete discussion.
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">We have another draft=
 that also reduces the amount of link-state information each IS-IS router m=
ust maintain but using IS-IS reflectors. This is slightly different but als=
o avoids leaking all the level-1 area
 link-state to the level-2 area. </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><a href=3D"https://ww=
w.ietf.org/id/draft-przygienda-lsr-flood-reflection-01.txt" target=3D"_blan=
k">https://www.ietf.org/id/draft-przygienda-lsr-flood-reflection-01.txt</a>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Given the amount of o=
verlap and the conflicts amongst these drafts, the chairs/Ads are now askin=
g whether there is a really a strong requirement to advance one or more of =
these documents. Especially given
 that we are already moving forward with both IS-IS/OSPF flooding reduction=
s and the Hierarchal IS-IS work. Additionally, =C2=A0we anticipate we=E2=80=
=99ll reach an impasse in consolidating these drafts. We=E2=80=99d really l=
ike to hear from the operators that would deploy these
 mechanisms. </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Thanks,<br>
Acee and Chris</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span></p>
</div>


</div></div></span></blockquote> <div></div></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--000000000000b17de3059d403362--


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From: Chris Bowers <chrisbowers.ietf@gmail.com>
Date: Wed, 29 Jan 2020 10:25:09 -0600
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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I would like to proposed the following text to make section 6 more clear.

Thanks,
Chris

====================

 (existing text)


6.  Advertising Anycast Property



   Both prefixes and SRv6 Locators may be configured as anycast and as

   such the same value can be advertised by multiple routers.  It is

   useful for other routers to know that the advertisement is for an

   anycast identifier.



   A new flag in "Bit Values for Prefix Attribute Flags Sub-TLV"

   registry [RFC7794] is defined to advertise the anycast property:



       Bit #: 4 (Suggested - to be assigned by IANA)

       Name: Anycast Flag (A-flag)



       When the prefix/SRv6 locator is configured as anycast, the A-flag

       SHOULD be set. Otherwise, this flag MUST be clear.



   The A-flag MUST be preserved when leaked between levels.



   The A-flag and the N-flag MUST NOT both be set.



==== start insert new text =======


   Certain use cases require prefixes/locators that uniquely belong to a
node.

   Since prefixes/locators which are not /128 should not have the N bit set,

   this node local uniqueness is decided based on A bit for non-/128
prefixes.

   When a prefix/locator is categorized as anycast, it does not uniquely
belong

   to a node and cannot be used for such use cases.  The rules below
specify

   how to determine whether or not a prefix/locator should be treated as
anycast

   in various situations.


   [RFC7794] contains the following restriction on the interpretation
of the N-flag.

   "If the flag is set and the prefix length is NOT a host prefix

    (/32 for IPV4, /128 for IPv6), then the flag MUST be ignored."



   The current document does NOT modify this restriction on the
interpretation of

   the N-flag imposed by [RFC7794].



   For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,

   if both N-flag and A-flag are set, the receiving router MUST treat the

   prefix advertisement as anycast.



   For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,

   if the N-flag and A-flag are NOT set, the receiving routers

   MUST treat the prefix advertisement as anycast.  This rule ensures the

   correct interpretation of a prefix advertisement originated by

   a router that is not SRv6 capable and originates a legacy

   Prefix Attribute Flags Sub-TLV based on [RFC7794] alone.



   For a prefix/SRv6 Locator advertisement with a prefix/locator that

   is NOT /128, the N-flag must be ignored, so the setting of the

   A-flag determines the anycast treatment of the prefix advertisement.



   The Prefix Attribute Flags Sub-TLV can be carried in the SRv6 Locator TLV

   as well as the Prefix Reachability TLVs.  When a router originates

   both the Prefix Reachability TLV and the SRv6 Locator TLV for a given

   prefix, and the router is originating the Prefix Attribute Flags Sub-TLV

   in one of the TLVs, the router SHOULD advertise identical versions of the

   Prefix Attribute Flags Sub-TLV in both TLVs.



   If a router receives one Prefix Attribute Flags Sub-TLV in the

   Prefix Reachability TLV and another in the SRv6 Locator TLV, the
router should

   use the prefix attribute flags received in the Prefix Reachability TLV.



   If a router receives a Prefix Attribute Flags Sub-TLV in the

   Prefix Reachability TLV but not in the SRv6 Locator TLV, the router should

   use the prefix attribute flags received in the Prefix Reachability TLV.



   If a router receives a Prefix Attribute Flags Sub-TLV in the

   SRv6 Locator TLV but not in the Prefix Reachability TLV,

   the router should use the prefix attribute flags received in the
SRv6 Locator TLV.



==== end insert new text =========



   The same prefix/SRv6 Locator can be advertised by multiple routers.

   If at least one of them sets the A-Flag in its advertisement, the

   prefix/SRv6 Locator SHOULD be considered as anycast.



===================

On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps <chopps@chopps.org> wrote:

> This begins a 2 week WG Last Call, ending after Feb 4, 2020, for
> draft-ietf-lsr-isis-srv6-extensions
>
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/
>
> Authors please indicate if you aware of any other IPR beyond what is
> posted:
>
>   https://datatracker.ietf.org/ipr/3796/
>
> Thanks,
> Chris & Acee.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr"><div>I would like to proposed the following text to make s=
ection 6 more clear.</div><div><br></div><div>Thanks,</div><div>Chris<br></=
div><div dir=3D"ltr">


















<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D<span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>=C2=A0(existing text)</span><=
/p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;f=
ont-family:&quot;Calibri&quot;,sans-serif"><span><br></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">6.=C2=A0
Advertising Anycast Property</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
Both prefixes and SRv6 Locators may be configured as anycast and as</span><=
span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
such the same value can be advertised by multiple routers.=C2=A0 It is</spa=
n><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
useful for other routers to know that the advertisement is for an</span><sp=
an></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
anycast identifier.</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
A new flag in &quot;Bit Values for Prefix Attribute Flags Sub-TLV&quot;</sp=
an><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
registry [RFC7794] is defined to advertise the anycast property:</span><spa=
n></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
Bit #: 4 (Suggested - to be assigned by IANA)</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
Name: Anycast Flag (A-flag)</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
When the prefix/SRv6 locator is configured as anycast, the A-flag</span><sp=
an></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
SHOULD be set. Otherwise, this flag MUST be clear.</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
The A-flag MUST be preserved when leaked between levels.<span></span></span=
></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;"><span>=C2=A0</span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
The A-flag and the N-flag MUST NOT both be set.</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;"><span>=C2=A0</span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=3D=3D=3D=3D
start insert new text =3D=3D=3D=3D=3D=3D=3D</span></p><p class=3D"MsoNormal=
" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri=
&quot;,sans-serif"><br></p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0=
.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif">


















</p>


















<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-family:&quot;Co=
urier New&quot;"><span>=C2=A0=C2=A0 </span>Certain use cases require prefix=
es/locators
that uniquely belong to a node.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-family:&quot;Co=
urier New&quot;"><span>=C2=A0=C2=A0 </span>Since prefixes/locators which ar=
e not /128 should not have the N bit set,<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-family:&quot;Co=
urier New&quot;"><span>=C2=A0=C2=A0 </span>this node local uniqueness is de=
cided based
on A bit for non-/128 prefixes.</span></p><p class=3D"MsoNormal" style=3D"m=
argin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-=
serif"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 Whe=
n a prefix/locator is<span></span></span><span style=3D"font-family:&quot;C=
ourier New&quot;"><span> </span>categorized as anycast, it does not uniquel=
y
belong <br></span></p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001=
pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=
=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 to a node and cannot =
be used <span></span></span><span style=3D"font-family:&quot;Courier New&qu=
ot;"><span></span>for such use cases.=C2=A0 The rules below specify <br></s=
pan></p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:1=
1pt;font-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-family:=
&quot;Courier New&quot;">=C2=A0=C2=A0 how to determine whether or not a pre=
fix/locator should be treated as anycast</span></p><p class=3D"MsoNormal" s=
tyle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&qu=
ot;,sans-serif"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=
=C2=A0 in various situations.<br></span></p><p class=3D"MsoNormal" style=3D=
"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,san=
s-serif"><br><span style=3D"font-family:&quot;Courier New&quot;"><span></sp=
an></span></p>





<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;"></span><=
span></span>

<pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 [RFC7794] contains the following restriction on=
 the interpretation of the N-flag.<span></span></pre><pre style=3D"margin:0=
in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0 =
=C2=A0&quot;If the flag is set and the prefix length is NOT a host prefix <=
span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font=
-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0(/32 for IPV4, /12=
8 for <font size=3D"2">IPv6</font>), then the flag MUST be ignored.&quot;<s=
pan></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-=
family:&quot;Courier New&quot;"><span>=C2=A0</span></pre><pre style=3D"marg=
in:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=
=A0=C2=A0 The current document does NOT modify this restriction on the inte=
rpretation of <span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font=
-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0the N-fla=
g imposed by [RFC7794].<span></span></pre>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0For
a prefix/SRv6 Locator</span> <span style=3D"font-size:10pt;font-family:&quo=
t;Courier New&quot;">advertisement
with a /128 prefix/locator,<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
if both N-flag and A-flag are set, the receiving router MUST treat the <spa=
n></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0prefix
advertisement as anycast.=C2=A0 <span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;"><span>=C2=A0</span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
For a prefix/SRv6 Locator</span> <span style=3D"font-size:10pt;font-family:=
&quot;Courier New&quot;">advertisement with a /128 prefix/locator,<span></s=
pan></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
if the N-flag and A-flag are NOT set, the receiving routers <span></span></=
span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0MUST
treat the prefix advertisement as anycast.=C2=A0 This rule ensures the <spa=
n></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0correct
interpretation of a prefix advertisement originated by <span></span></span>=
</p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0a
router that is not SRv6 capable and originates a legacy <span></span></span=
></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0Prefix
Attribute Flags Sub-TLV based on [RFC7794] alone.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>=C2=A0</span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
For a prefix/SRv6 Locator</span> <span style=3D"font-size:10pt;font-family:=
&quot;Courier New&quot;">advertisement with a prefix/locator that<span></sp=
an></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
is NOT /128, the N-flag must be ignored, so the setting of the <span></span=
></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0A-flag
determines the anycast treatment of the prefix advertisement.<span></span><=
/span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0The
Prefix Attribute Flags Sub-TLV can be carried in the SRv6 Locator TLV</span=
><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0
=C2=A0as well as the Prefix Reachability TLVs.=C2=A0 When a router originat=
es </span><span></span></p>

<pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0both the Prefix Reachability TLV and the S=
Rv6 Locator TLV for a given <span></span></pre><pre style=3D"margin:0in 0in=
 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=
=C2=A0prefix, and the router is originating the Prefix Attribute Flags Sub-=
TLV<span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;=
font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 in one of the TLVs, the r=
outer SHOULD advertise identical versions of the <span></span></pre><pre st=
yle=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New=
&quot;">=C2=A0=C2=A0=C2=A0Prefix Attribute Flags Sub-TLV in both TLVs.=C2=
=A0 <span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt=
;font-family:&quot;Courier New&quot;">=C2=A0<span></span></pre><pre style=
=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&qu=
ot;">=C2=A0=C2=A0 If a router receives one Prefix Attribute Flags Sub-TLV i=
n the <span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10=
pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0Prefix Reachabili=
ty TLV and another in the SRv6 Locator TLV, the router should <span></span>=
</pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quo=
t;Courier New&quot;">=C2=A0=C2=A0=C2=A0use the prefix attribute flags recei=
ved in the Prefix Reachability TLV.<span></span></pre><pre style=3D"margin:=
0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=
<span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;fon=
t-family:&quot;Courier New&quot;">=C2=A0=C2=A0 If a router receives a Prefi=
x Attribute Flags Sub-TLV in the <span></span></pre><pre style=3D"margin:0i=
n 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=
=C2=A0=C2=A0Prefix Reachability TLV but not in the SRv6 Locator TLV, the ro=
uter should <span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-s=
ize:10pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0use the pre=
fix attribute flags received in the Prefix Reachability TLV.<span></span></=
pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;=
Courier New&quot;">=C2=A0<span></span></pre><pre style=3D"margin:0in 0in 0.=
0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 If =
a router receives a Prefix Attribute Flags Sub-TLV in the <span></span></pr=
e><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0=C2=A0SRv6 Locator TLV but not in the Prefix R=
eachability TLV,<span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;fo=
nt-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0 =C2=A0the router s=
hould use the prefix attribute flags received in the SRv6 Locator TLV.<span=
></span></pre>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=3D=3D=3D=3D
end insert new text =3D=3D=3D=3D=3D=3D=3D=3D=3D</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0</span><span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
The same prefix/SRv6 Locator can be advertised by multiple routers.</span><=
span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
If at least one of them sets the A-Flag in its advertisement, the</span><sp=
an></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
prefix/SRv6 Locator SHOULD be considered as anycast.</span></p><p class=3D"=
MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quo=
t;Calibri&quot;,sans-serif"><br></p><p class=3D"MsoNormal" style=3D"margin:=
0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"=
><br></p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:=
11pt;font-family:&quot;Calibri&quot;,sans-serif">=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br><span style=3D"font-size:10pt;font-fam=
ily:&quot;Courier New&quot;"></span><span></span></p>





</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps &lt;<a href=3D"mailto:chopp=
s@chopps.org">chopps@chopps.org</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">This begins a 2 week WG Last Call, ending =
after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions<br>
<br>
=C2=A0 <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6=
-extensions/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf=
.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a><br>
<br>
Authors please indicate if you aware of any other IPR beyond what is posted=
:<br>
<br>
=C2=A0 <a href=3D"https://datatracker.ietf.org/ipr/3796/" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/ipr/3796/</a><br>
<br>
Thanks,<br>
Chris &amp; Acee.<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div></div>

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Chris Bowers <chrisbowers.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-ads@ietf.org" <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Date: Thu, 30 Jan 2020 11:16:12 +0800
From: "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>
To: "Christian Hopps" <chopps@chopps.org>,  lsr <lsr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/bD4BsdQ0xzp-uy1Fswv13EcioRA>
Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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<html><head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-bo=
ttom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-family: ????=
; color: rgb(0, 0, 0); line-height: 1.5; }</style></head><body>=0A=
<div><span></span>support the adoption with the following comments.</div><d=
iv><br></div><div>1. What does SRH stack mean in section 4.2? AS specified =
in RFC8200 and&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; bac=
kground-color: transparent;">draft-ietf-6man-segment-routing-header</span><=
span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transp=
arent;">, only one SRH can be presented in one IPv6 header.</span></div><di=
v>2. The abbreviations used in this draft should be listed in a seperated s=
ection or point out where they are defined.</div><div>3.&nbsp;<span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: transparent;">Al=
gorithm field is defined for End.x SID to carry the algorithm the end.x sid=
 associates. But no&nbsp;</span><span style=3D"font-size: 10.5pt; line-heig=
ht: 1.5; background-color: transparent;">algorithm field is defined for End=
 SID in section 7. May I know the reason?</span></div>=0A=
<div><br></div><div>Best Regards,</div><div>Zhenqiang Li</div><hr style=3D"=
width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=3D"left">=0A=
<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10p=
t"><div>li_zhenqiang@hotmail.com</div></div></span></div>=0A=
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m"><div>&nbsp;</div><div style=3D"border:none;border-top:solid #B5C4DF 1.0p=
t;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT=
: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefe=
f; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D=
"mailto:chopps@chopps.org">Christian Hopps</a></div><div><b>Date:</b>&nbsp;=
2020-01-24&nbsp;04:24</div><div><b>To:</b>&nbsp;<a href=3D"mailto:lsr@ietf.=
org">lsr</a></div><div><b>CC:</b>&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv=
3-srv6-extensions@ietf.org">draft-li-lsr-ospfv3-srv6-extensions</a>; <a hre=
f=3D"mailto:lsr-ads@ietf.org">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.=
org">Christian Hopps</a>; <a href=3D"mailto:acee@cisco.com">Acee Lindem \(a=
cee\)</a></div><div><b>Subject:</b>&nbsp;[Lsr] WG Adoption Call for draft-l=
i-lsr-ospfv3-srv6-extensions</div></div></div><div><div>Hi LSR WG and Draft=
 Authors,</div>=0A=
<div>&nbsp;</div>=0A=
<div>The authors originally requested adoption back @ 105; however, some co=
mments were received and new version was produced. Moving forward...</div>=
=0A=
<div>&nbsp;</div>=0A=
<div>This begins a 2 week WG adoption poll for the following draft:</div>=
=0A=
<div>&nbsp;</div>=0A=
<div>&nbsp; https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-exten=
sions/</div>=0A=
<div> </div>=0A=
<div>Please indicate your support or objection by Feb 6, 2020.</div>=0A=
<div>&nbsp;</div>=0A=
<div>Authors, please respond indicating whether you are aware of any IPR th=
at applies to this draft.</div>=0A=
<div>&nbsp;</div>=0A=
<div>Thanks,</div>=0A=
<div>Chris &amp; Acee.</div>=0A=
<div>_______________________________________________</div>=0A=
<div>Lsr mailing list</div>=0A=
<div>Lsr@ietf.org</div>=0A=
<div>https://www.ietf.org/mailman/listinfo/lsr</div>=0A=
</div></blockquote>=0A=
</body></html>=

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hello Zhenqiang Li,

Thanks for your review and comments. Please check inline below.

From: li_zhenqiang@hotmail.com <li_zhenqiang@hotmail.com>
Sent: 30 January 2020 08:46
To: Christian Hopps <chopps@chopps.org>; lsr <lsr@ietf.org>
Cc: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extension=
s@ietf.org>; lsr-ads <lsr-ads@ietf.org>; Christian Hopps <chopps@chopps.org=
>; Acee Lindem (acee) <acee@cisco.com>
Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions

support the adoption with the following comments.

1. What does SRH stack mean in section 4.2? AS specified in RFC8200 and dra=
ft-ietf-6man-segment-routing-header, only one SRH can be presented in one I=
Pv6 header.

[KT] Thanks for catching this error and will fix as below:


OLD: The Maximum End Pop MSD Type specifies the maximum number of SIDs in
   the top SRH in an SRH stack to which the router can apply Penultimate
   Segment Pop (PSP) or Ultimate Segment Pop (USP)


NEW: The Maximum End Pop MSD Type specifies the maximum number of SIDs in

   the SRH for which the router can apply Penultimate

   Segment Pop (PSP) or Ultimate Segment Pop (USP)

2. The abbreviations used in this draft should be listed in a seperated sec=
tion or point out where they are defined.
[KT] We've followed the convention of expanding on first use as also provid=
ing reference where necessary. Please do let know if we've missed doing so =
anywhere.

3. Algorithm field is defined for End.x SID to carry the algorithm the end.=
x sid associates. But no algorithm field is defined for End SID in section =
7. May I know the reason?
[KT] The SRv6 Locator TLV that is the parent of the SRv6 End SID Sub-TLV ca=
rries the algorithm and hence there is no need to repeat in the Sub-TLV. Th=
is is not the case for SRv6 End.X SID Sub-TLV and hence it has the algorith=
m field.

Thanks,
Ketan

Best Regards,
Zhenqiang Li
________________________________
li_zhenqiang@hotmail.com<mailto:li_zhenqiang@hotmail.com>

From: Christian Hopps<mailto:chopps@chopps.org>
Date: 2020-01-24 04:24
To: lsr<mailto:lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions<mailto:draft-li-lsr-ospfv3-srv6-ext=
ensions@ietf.org>; lsr-ads<mailto:lsr-ads@ietf.org>; Christian Hopps<mailto=
:chopps@chopps.org>; Acee Lindem \(acee\)<mailto:acee@cisco.com>
Subject: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
Hi LSR WG and Draft Authors,

The authors originally requested adoption back @ 105; however, some comment=
s were received and new version was produced. Moving forward...

This begins a 2 week WG adoption poll for the following draft:

  https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
Please indicate your support or objection by Feb 6, 2020.

Authors, please respond indicating whether you are aware of any IPR that ap=
plies to this draft.

Thanks,
Chris & Acee.
_______________________________________________
Lsr mailing list
Lsr@ietf.org<mailto:Lsr@ietf.org>
https://www.ietf.org/mailman/listinfo/lsr

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<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Hello Zhe=
nqiang Li,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US">Thanks fo=
r your review and comments. Please check inline below.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-US"><o:p>&nbs=
p;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> li_zhenqiang@hotmail.com &lt;li_zhenqiang@hotmail.com&gt;
<br>
<b>Sent:</b> 30 January 2020 08:46<br>
<b>To:</b> Christian Hopps &lt;chopps@chopps.org&gt;; lsr &lt;lsr@ietf.org&=
gt;<br>
<b>Cc:</b> draft-li-lsr-ospfv3-srv6-extensions &lt;draft-li-lsr-ospfv3-srv6=
-extensions@ietf.org&gt;; lsr-ads &lt;lsr-ads@ietf.org&gt;; Christian Hopps=
 &lt;chopps@chopps.org&gt;; Acee Lindem (acee) &lt;acee@cisco.com&gt;<br>
<b>Subject:</b> Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-ext=
ensions<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">support the adoption with the following comment=
s.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">1. What does SRH stack mean in section 4.2? AS =
specified in RFC8200 and&nbsp;draft-ietf-6man-segment-routing-header, only =
one SRH can be presented in one IPv6 header.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><i>[KT] Thanks for catching this error and will f=
ix as below:<o:p></o:p></i></b></p>
<p class=3D"MsoNormal"><b><i><o:p>&nbsp;</o:p></i></b></p>
<pre><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif">OLD: =
</span></i></b><span style=3D"color:black">The Maximum End Pop MSD Type spe=
cifies the maximum number of SIDs in<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; the top SRH in an SRH stack to wh=
ich the router can apply Penultimate<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Segment Pop (PSP) or Ultimate Seg=
ment Pop (USP)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><o:p>&nbsp;</o:p></i></b></p>
<pre><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif">NEW:<=
/span></i></b><span style=3D"color:black"> The Maximum End Pop MSD Type spe=
cifies the maximum number of SIDs in<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; the SRH for which the router =
can apply Penultimate<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Segment Pop (PSP) or Ultimate=
 Segment Pop (USP)<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">2. The abbreviations used in this draft should =
be listed in a seperated section or point out where they are defined.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><b><i>[KT] We&#8217;ve followed the convention of ex=
panding on first use as also providing reference where necessary. Please do=
 let know if we&#8217;ve missed doing so anywhere.<o:p></o:p></i></b></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">3.&nbsp;Algorithm field is defined for End.x SI=
D to carry the algorithm the end.x sid associates. But no&nbsp;algorithm fi=
eld is defined for End SID in section 7. May I know the
 reason?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i>[KT] The SRv6 Locator TLV that is the parent o=
f the SRv6 End SID Sub-TLV carries the algorithm and hence there is no need=
 to repeat in the Sub-TLV. This is not the case for SRv6 End.X SID Sub-TLV =
and hence it has the algorithm field.<o:p></o:p></i></b></p>
<p class=3D"MsoNormal"><b><i><o:p>&nbsp;</o:p></i></b></p>
<p class=3D"MsoNormal"><b><i>Thanks,<o:p></o:p></i></b></p>
<p class=3D"MsoNormal"><b><i>Ketan</i></b><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Best Regards,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Zhenqiang Li<o:p></o:p></span></p>
</div>
<div class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
????&quot;,serif;color:black">
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" style=3D"=
color:#B5C4DF" align=3D"left">
</span></div>
<div>
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhenqiang@hotmail.=
com">li_zhenqiang@hotmail.com</a><o:p></o:p></span></p>
</div>
</div>
</div>
<blockquote style=3D"margin-left:6.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">From:</sp=
an></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">&nbsp;<a href=3D"mailto:chopps@chopps.org">Christian
 Hopps</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">Date:</sp=
an></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">&nbsp;2020-01-24&nbsp;04:24<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">To:</span=
></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-ser=
if;color:black">&nbsp;<a href=3D"mailto:lsr@ietf.org">lsr</a><o:p></o:p></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">CC:</span=
></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-ser=
if;color:black">&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-srv6-extensions=
@ietf.org">draft-li-lsr-ospfv3-srv6-extensions</a>;
<a href=3D"mailto:lsr-ads@ietf.org">lsr-ads</a>; <a href=3D"mailto:chopps@c=
hopps.org">
Christian Hopps</a>; <a href=3D"mailto:acee@cisco.com">Acee Lindem \(acee\)=
</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background:#EFEFEF"><b><span style=3D"font-=
size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:black">Subject:<=
/span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,san=
s-serif;color:black">&nbsp;[Lsr] WG Adoption Call for draft-li-lsr-ospfv3-s=
rv6-extensions<o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Hi LSR WG and Draft Authors,<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">The authors originally requested adoption back =
@ 105; however, some comments were received and new version was produced. M=
oving forward...<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">This begins a 2 week WG adoption poll for the f=
ollowing draft:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;
<a href=3D"https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extens=
ions/">https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions=
/</a><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Please indicate your support or objection by Fe=
b 6, 2020.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Authors, please respond indicating whether you =
are aware of any IPR that applies to this draft.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Chris &amp; Acee.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">_______________________________________________=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black">Lsr mailing list<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a=
><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;??=
??&quot;,serif;color:black"><a href=3D"https://www.ietf.org/mailman/listinf=
o/lsr">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
</body>
</html>

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Date: Thu, 30 Jan 2020 16:15:30 +0800
From: "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>,  "Christian Hopps" <chopps@chopps.org>, lsr <lsr@ietf.org>
Cc: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>,  lsr-ads <lsr-ads@ietf.org>, "Christian Hopps" <chopps@chopps.org>,  "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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<html><head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"><s=
tyle>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-bottom:=
 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.Fo=
xDiv20200130153820872339 { }body { font-size: 10.5pt; font-family: =E5=BE=
=AE=E8=BD=AF=E9=9B=85=E9=BB=91; color: rgb(0, 0, 0); line-height: 1.5; }</s=
tyle></head><body>=0A=
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->=0A=
<div><span></span>Thank you KT for your quick response. Please see my reply=
 begins with [ZQ].</div>=0A=
<div><br></div><div>Best Regards,</div><div>Zhenqiang Li</div><hr style=3D"=
width: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=3D"left">=0A=
<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10p=
t"><div>li_zhenqiang@hotmail.com</div></div></span></div>=0A=
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m"><div>&nbsp;</div><div style=3D"border:none;border-top:solid #B5C4DF 1.0p=
t;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT=
: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefe=
f; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D=
"mailto:ketant@cisco.com" style=3D"color: blue; text-decoration: underline;=
">Ketan Talaulikar (ketant)</a></div><div><b>Date:</b>&nbsp;2020-01-30&nbsp=
;13:42</div><div><b>To:</b>&nbsp;<a href=3D"mailto:li_zhenqiang@hotmail.com=
" style=3D"color: blue; text-decoration: underline;">li_zhenqiang@hotmail.c=
om</a>; <a href=3D"mailto:chopps@chopps.org" style=3D"color: blue; text-dec=
oration: underline;">Christian Hopps</a>; <a href=3D"mailto:lsr@ietf.org" s=
tyle=3D"color: blue; text-decoration: underline;">lsr</a></div><div><b>CC:<=
/b>&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org" st=
yle=3D"color: blue; text-decoration: underline;">draft-li-lsr-ospfv3-srv6-e=
xtensions</a>; <a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; te=
xt-decoration: underline;">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.org=
" style=3D"color: blue; text-decoration: underline;">Christian Hopps</a>; <=
a href=3D"mailto:acee@cisco.com" style=3D"color: blue; text-decoration: und=
erline;">Acee Lindem (acee)</a></div><div><b>Subject:</b>&nbsp;RE: [Lsr] WG=
 Adoption Call for draft-li-lsr-ospfv3-srv6-extensions</div></div></div><di=
v><div class=3D"FoxDiv20200130153820872339">=0A=
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->=0A=
<div class=3D"WordSection1" style=3D"page: WordSection1;">=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S">Hello Zhenqiang Li,<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S">Thanks for your review and comments. Please check inline below.<o:p></o:=
p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>=0A=
<div>=0A=
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><span lang=3D"EN-US">From:</span></b>=
<span lang=3D"EN-US"> li_zhenqiang@hotmail.com &lt;li_zhenqiang@hotmail.com=
&gt;=0A=
<br>=0A=
<b>Sent:</b> 30 January 2020 08:46<br>=0A=
<b>To:</b> Christian Hopps &lt;chopps@chopps.org&gt;; lsr &lt;lsr@ietf.org&=
gt;<br>=0A=
<b>Cc:</b> draft-li-lsr-ospfv3-srv6-extensions &lt;draft-li-lsr-ospfv3-srv6=
-extensions@ietf.org&gt;; lsr-ads &lt;lsr-ads@ietf.org&gt;; Christian Hopps=
 &lt;chopps@chopps.org&gt;; Acee Lindem (acee) &lt;acee@cisco.com&gt;<br>=
=0A=
<b>Subject:</b> Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-ext=
ensions<o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">support the adoption with the follo=
wing comments.<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">1. What does SRH stack mean in sect=
ion 4.2? AS specified in RFC8200 and&nbsp;draft-ietf-6man-segment-routing-h=
eader, only one SRH can be presented in one IPv6 header.<o:p></o:p></span><=
/p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif"><o:p>&nbsp;</o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i>[KT] Thanks for catching this erro=
r and will fix as below:<o:p></o:p></i></b></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><o:p>&nbsp;</o:p></i></b></p>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif"=
>OLD: </span></i></b><span style=3D"color:black">The Maximum End Pop MSD Ty=
pe specifies the maximum number of SIDs in<o:p></o:p></span></pre>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; the top SRH in an SRH=
 stack to which the router can apply Penultimate<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; Segment Pop (PSP) or =
Ultimate Segment Pop (USP)<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><o:p>&nbsp;</o:p></i></b></p>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif"=
>NEW:</span></i></b><span style=3D"color:black"> The Maximum End Pop MSD Ty=
pe specifies the maximum number of SIDs in<o:p></o:p></span></pre>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><span style=3D"color:black">&nbsp;&nbsp; the SRH for which the r=
outer can apply Penultimate<o:p></o:p></span></pre>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><span style=3D"color:black">&nbsp;&nbsp; Segment Pop (PSP) or Ul=
timate Segment Pop (USP)<o:p></o:p></span></pre>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p><br></o:p></p><p class=3D"MsoNormal=
" style=3D"margin: 0cm 0cm 0.0001pt; font-family: Calibri, sans-serif;"><o:=
p style=3D"font-size: 19px;"><font color=3D"#ff0000">[ZQ] Fine.</font></o:p=
></p><p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 1=
1pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">2. The abbreviations used in this d=
raft should be listed in a seperated section or point out where they are de=
fined.<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i>[KT] We=E2=80=99ve followed the co=
nvention of expanding on first use as also providing reference where necess=
ary. Please do let know if we=E2=80=99ve missed doing so anywhere.<o:p></o:=
p></i></b></p><p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt;"><f=
ont color=3D"#ff0000" face=3D"Calibri, sans-serif"><span style=3D"font-size=
: 19px;"><br></span></font></p><p class=3D"MsoNormal" style=3D"margin: 0cm =
0cm 0.0001pt;"><font color=3D"#ff0000" face=3D"Calibri, sans-serif"><span s=
tyle=3D"font-size: 19px;">[ZQ] Some examples: SPF&nbsp;<span style=3D"line-=
height: 22px;">computation in secction 5, &nbsp;TBD in section 2.</span></s=
pan></font></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">3.&nbsp;Algorithm field is defined =
for End.x SID to carry the algorithm the end.x sid associates. But no&nbsp;=
algorithm field is defined for End SID in section 7. May I know the=0A=
 reason?<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i>[KT] The SRv6 Locator TLV that is =
the parent of the SRv6 End SID Sub-TLV carries the algorithm and hence ther=
e is no need to repeat in the Sub-TLV. This is not the case for SRv6 End.X =
SID Sub-TLV and hence it has the algorithm field.<o:p></o:p></i></b></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><o:p><br></o:p></i></b></p><p clas=
s=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-fa=
mily: Calibri, sans-serif;"><span style=3D"color: rgb(255, 0, 0); font-size=
: 19px; line-height: 28.5px;">[ZQ] Make sense but still a little bit weird<=
/span><span style=3D"color: rgb(255, 0, 0); font-size: 19px;">. Since any S=
ID belongs to a locator, or it is not routable, the algorithm field in the =
end.x sid is not needed, end.x sid associates the algorithm carried in the =
corresponding locator tlv.</span></p><p class=3D"MsoNormal" style=3D"margin=
: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b>=
<i><o:p>&nbsp;</o:p></i></b></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i>Thanks,<o:p></o:p></i></b></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i>Ketan</i></b><o:p></o:p></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><o:p>&nbsp;</o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Best Regards,<o:p></o:p></span></p>=
=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Zhenqiang Li<o:p></o:p></span></p>=
=0A=
</div>=0A=
<div class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-f=
amily:&quot;????&quot;,serif;color:black">=0A=
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" align=3D"=
left">=0A=
</span></div>=0A=
<div>=0A=
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Verdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhenqi=
ang@hotmail.com" style=3D"color: blue; text-decoration: underline;">li_zhen=
qiang@hotmail.com</a><o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<blockquote style=3D"margin-left: 6pt; margin-top: 0px;">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">From:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:chopps@chopps.org"=
 style=3D"color: blue; text-decoration: underline;">Christian=0A=
 Hopps</a><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Date:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;2020-01-24&nbsp;04:24<o:p></o:p></sp=
an></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">To:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:lsr@ietf.org" style=
=3D"color: blue; text-decoration: underline;">lsr</a><o:p></o:p></span></p>=
=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">CC:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-=
srv6-extensions@ietf.org" style=3D"color: blue; text-decoration: underline;=
">draft-li-lsr-ospfv3-srv6-extensions</a>;=0A=
<a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; text-decoration: =
underline;">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.org" style=3D"colo=
r: blue; text-decoration: underline;">=0A=
Christian Hopps</a>; <a href=3D"mailto:acee@cisco.com" style=3D"color: blue=
; text-decoration: underline;">Acee Lindem \(acee\)</a><o:p></o:p></span></=
p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Subject:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;T=
ahoma&quot;,sans-serif;color:black">&nbsp;[Lsr] WG Adoption Call for draft-=
li-lsr-ospfv3-srv6-extensions<o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Hi LSR WG and Draft Authors,<o:p></=
o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">The authors originally requested ad=
option back @ 105; however, some comments were received and new version was=
 produced. Moving forward...<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">This begins a 2 week WG adoption po=
ll for the following draft:<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;=0A=
<a href=3D"https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extens=
ions/" style=3D"color: blue; text-decoration: underline;">https://datatrack=
er.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/</a><o:p></o:p></span><=
/p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Please indicate your support or obj=
ection by Feb 6, 2020.<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Authors, please respond indicating =
whether you are aware of any IPR that applies to this draft.<o:p></o:p></sp=
an></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Thanks,<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Chris &amp; Acee.<o:p></o:p></span>=
</p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">___________________________________=
____________<o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Lsr mailing list<o:p></o:p></span><=
/p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><a href=3D"mailto:Lsr@ietf.org" sty=
le=3D"color: blue; text-decoration: underline;">Lsr@ietf.org</a><o:p></o:p>=
</span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><a href=3D"https://www.ietf.org/mai=
lman/listinfo/lsr" style=3D"color: blue; text-decoration: underline;">https=
://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</blockquote>=0A=
</div>=0A=
</div></div></blockquote>=0A=
</body></html>=

------=_001_NextPart565427046578_=------


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: RE: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Date: Thu, 30 Jan 2020 08:44:02 +0000
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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To: Chris Bowers <chrisbowers.ietf@gmail.com>, lsr@ietf.org
Cc: lsr-ads@ietf.org, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>
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From: Peter Psenak <ppsenak@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/97CWkJeF9uXIPQYXyEn_72TwMME>
Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Hi Chris,

please see inline (##PP)

On 29/01/2020 17:25, Chris Bowers wrote:
> I would like to proposed the following text to make section 6 more clear.
> 
> Thanks,
> Chris
> 
> ====================
> 
>   (existing text)
> 
> 
> 6.  Advertising Anycast Property
> 
>     Both prefixes and SRv6 Locators may be configured as anycast and as
> 
>     such the same value can be advertised by multiple routers.  It is
> 
>     useful for other routers to know that the advertisement is for an
> 
>     anycast identifier.
> 
>     A new flag in "Bit Values for Prefix Attribute Flags Sub-TLV"
> 
>     registry [RFC7794] is defined to advertise the anycast property:
> 
>         Bit #: 4 (Suggested - to be assigned by IANA)
> 
>         Name: Anycast Flag (A-flag)
> 
>         When the prefix/SRv6 locator is configured as anycast, the A-flag
> 
>         SHOULD be set. Otherwise, this flag MUST be clear.
> 
>     The A-flag MUST be preserved when leaked between levels.
> 
>     The A-flag and the N-flag MUST NOT both be set.
> 
> ==== start insert new text =======
> 
> 
> Certain use cases require prefixes/locators that uniquely belong to a node.
> 
> Since prefixes/locators which are not /128 should not have the N bit set,
> 
> this node local uniqueness is decided based on A bit for non-/128 prefixes.

##PP
above does not seem correct. Above seems to imply that for non-/128 
prefix, A-bit is replacement of N-bit.

A-bit applies to both /128 and non-/128 prefixes equally.

Current draft clearly states what to do when both N a A bits are set.



> 
>     When a prefix/locator iscategorized as anycast, it does not uniquely 
> belong
> 
>     to a node and cannot be used for such use cases.  The rules below 
> specify
> 
>     how to determine whether or not a prefix/locator should be treated 
> as anycast
> 
>     in various situations.
> 
> 
>     [RFC7794] contains the following restriction on the interpretation of the N-flag.
> 
>     "If the flag is set and the prefix length is NOT a host prefix
> 
>      (/32 for IPV4, /128 forIPv6), then the flag MUST be ignored."
> 
>     The current document does NOT modify this restriction on the interpretation of
> 
>     the N-flag imposed by [RFC7794].

##PP
I don't think above text is needed. And I don't think above is 
completely correct, as we define a new case in which the N-bit should be 
ignored (when A-bit is set).


> 
>     For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,
> 
>     if both N-flag and A-flag are set, the receiving router MUST treat the
> 
>     prefix advertisement as anycast.

##PP
we have following text in the draft already:

"If both N-flag and A-flag are set in the prefix/SRv6 Locator
    advertisement, the receiving routers MUST ignore the N-flag."



> 
>     For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,
> 
>     if the N-flag and A-flag are NOT set, the receiving routers
> 
>     MUST treat the prefix advertisement as anycast.  

##PP
I don't think above statement is correct. Why a node cannot advertise a 
/128 prefix which is not an anycast one and does not have a N-bit set?



> This rule ensures the
> 
>     correct interpretation of a prefix advertisement originated by
> 
>     a router that is not SRv6 capable and originates a legacy
> 
>     Prefix Attribute Flags Sub-TLV based on [RFC7794] alone.
> 
>     For a prefix/SRv6 Locator advertisement with a prefix/locator that
> 
>     is NOT /128, the N-flag must be ignored, so the setting of the
> 
>     A-flag determines the anycast treatment of the prefix advertisement.

##PP
A-flag does that regardless of the length of the prefix.


> 
>     The Prefix Attribute Flags Sub-TLV can be carried in the SRv6 
> Locator TLV
> 
>     as well as the Prefix Reachability TLVs.  When a router originates
> 
>     both the Prefix Reachability TLV and the SRv6 Locator TLV for a given
> 
>     prefix, and the router is originating the Prefix Attribute Flags Sub-TLV
> 
>     in one of the TLVs, the router SHOULD advertise identical versions of the
> 
>     Prefix Attribute Flags Sub-TLV in both TLVs.

##PP
Above seems a good suggestion. Will add it.

> 
>   
> 
>     If a router receives one Prefix Attribute Flags Sub-TLV in the
> 
>     Prefix Reachability TLV and another in the SRv6 Locator TLV, the router should
> 
>     use the prefix attribute flags received in the Prefix Reachability TLV.

##PP
above contradicts what you suggest in the previous paragraph, where you 
suggest we need to advertise with both prefix and locator, and here you 
suggest we ignore what we received in the locator.

Are you talking about the case where the content of the Prefix Attribute 
Flags Sub-TLV is different in prefix vs locator?
> 
>   
> 
>     If a router receives a Prefix Attribute Flags Sub-TLV in the
> 
>     Prefix Reachability TLV but not in the SRv6 Locator TLV, the router should
> 
>     use the prefix attribute flags received in the Prefix Reachability TLV.

##PP
do we really need this? If the originator does the right thing, then we 
don't have the problem. Cross referencing data between different TLVs 
complicates the implementations.


> 
>   
> 
>     If a router receives a Prefix Attribute Flags Sub-TLV in the
> 
>     SRv6 Locator TLV but not in the Prefix Reachability TLV,
> 
>     the router should use the prefix attribute flags received in the SRv6 Locator TLV.

##PP
same as above.

thanks,
Peter

> 
> ==== end insert new text =========
> 
>     The same prefix/SRv6 Locator can be advertised by multiple routers.
> 
>     If at least one of them sets the A-Flag in its advertisement, the
> 
>     prefix/SRv6 Locator SHOULD be considered as anycast.
> 
> 
> 
> ===================
> 
> 
> On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps <chopps@chopps.org 
> <mailto:chopps@chopps.org>> wrote:
> 
>     This begins a 2 week WG Last Call, ending after Feb 4, 2020, for
>     draft-ietf-lsr-isis-srv6-extensions
> 
>     https://datatracker.ietf..org/doc/draft-ietf-lsr-isis-srv6-extensions/
>     <https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/>
> 
>     Authors please indicate if you aware of any other IPR beyond what is
>     posted:
> 
>     https://datatracker.ietf.org/ipr/3796/
> 
>     Thanks,
>     Chris & Acee.
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org <mailto:Lsr@ietf.org>
>     https://www.ietf.org/mailman/listinfo/lsr
> 


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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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<html><head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312"><=
style>body { line-height: 1.5; }blockquote { margin-top: 0px; margin-bottom=
: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-bottom: 0px; }div.F=
oxDiv20200130230533074745 { }body { font-size: 10.5pt; font-family: =CE=A2=
=C8=ED=D1=C5=BA=DA; color: rgb(0, 0, 0); line-height: 1.5; }</style></head>=
<body>=0A=
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->=0A=
<div><span></span>For the third concern, I think it is better to list the c=
onsiderations behind the format design of the TLVs to help readers understa=
nd them better. For the specification behavior you mention, this doc SHOULD=
 specify it explicitly.</div>=0A=
<div>By the way, what a router should do when it receives END.X SID contain=
ing algorithm that is different from the one carried in the convering locat=
or?</div><div><br></div><div>Best Regards,</div><div>Zhenqiang Li</div><hr =
style=3D"WIDTH: 210px; HEIGHT: 1px" color=3D"#b5c4df" size=3D"1" align=3D"l=
eft">=0A=
<div><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10p=
t"><div>li_zhenqiang@hotmail.com</div></div></span></div>=0A=
<blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5e=
m"><div>&nbsp;</div><div style=3D"border:none;border-top:solid #B5C4DF 1.0p=
t;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT=
: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefe=
f; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D=
"mailto:ketant@cisco.com" style=3D"color: blue; text-decoration: underline;=
">Ketan Talaulikar (ketant)</a></div><div><b>Date:</b>&nbsp;2020-01-30&nbsp=
;16:44</div><div><b>To:</b>&nbsp;<a href=3D"mailto:li_zhenqiang@hotmail.com=
" style=3D"color: blue; text-decoration: underline;">li_zhenqiang@hotmail.c=
om</a>; <a href=3D"mailto:chopps@chopps.org" style=3D"color: blue; text-dec=
oration: underline;">Christian Hopps</a>; <a href=3D"mailto:lsr@ietf.org" s=
tyle=3D"color: blue; text-decoration: underline;">lsr</a></div><div><b>CC:<=
/b>&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org" st=
yle=3D"color: blue; text-decoration: underline;">draft-li-lsr-ospfv3-srv6-e=
xtensions</a>; <a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; te=
xt-decoration: underline;">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.org=
" style=3D"color: blue; text-decoration: underline;">Christian Hopps</a>; <=
a href=3D"mailto:acee@cisco.com" style=3D"color: blue; text-decoration: und=
erline;">Acee Lindem (acee)</a></div><div><b>Subject:</b>&nbsp;RE: RE: [Lsr=
] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions</div></div></div=
><div><div class=3D"FoxDiv20200130230533074745">=0A=
<!--[if gte mso 9]><xml>=0A=
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" ></o:shapedefaults>=0A=
</xml><![endif]--><!--[if gte mso 9]><xml>=0A=
<o:shapelayout v:ext=3D"edit">=0A=
<o:idmap v:ext=3D"edit" data=3D"1" ></o:idmap>=0A=
</o:shapelayout></xml><![endif]-->=0A=
<div class=3D"WordSection1" style=3D"page: WordSection1;">=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S">Please check inline again.<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"mso-fareast-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>=0A=
<div>=0A=
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><span lang=3D"EN-US">From:</span></b>=
<span lang=3D"EN-US"> li_zhenqiang@hotmail.com &lt;li_zhenqiang@hotmail.com=
&gt;=0A=
<br>=0A=
<b>Sent:</b> 30 January 2020 13:46<br>=0A=
<b>To:</b> Ketan Talaulikar (ketant) &lt;ketant@cisco.com&gt;; Christian Ho=
pps &lt;chopps@chopps.org&gt;; lsr &lt;lsr@ietf.org&gt;<br>=0A=
<b>Cc:</b> draft-li-lsr-ospfv3-srv6-extensions &lt;draft-li-lsr-ospfv3-srv6=
-extensions@ietf.org&gt;; lsr-ads &lt;lsr-ads@ietf.org&gt;; Christian Hopps=
 &lt;chopps@chopps.org&gt;; Acee Lindem (acee) &lt;acee@cisco.com&gt;<br>=
=0A=
<b>Subject:</b> Re: RE: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6=
-extensions<o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></p>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black">Thank you KT for yo=
ur quick response. Please see my reply begins with [ZQ].<o:p></o:p></span><=
/p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></=
span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black">Best Regards,<o:p><=
/o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black">Zhenqiang Li<o:p></=
o:p></span></p>=0A=
</div>=0A=
<div class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-f=
amily:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=0A=
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" align=3D"=
left">=0A=
</span></div>=0A=
<div>=0A=
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Verdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhenqi=
ang@hotmail.com" style=3D"color: blue; text-decoration: underline;">li_zhen=
qiang@hotmail.com</a><o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<blockquote style=3D"margin-left: 6pt; margin-top: 0px;">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black">&nbsp;<o:p></o:p></=
span></p>=0A=
</div>=0A=
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">From:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:ketant@cisco.com" =
style=3D"color: blue; text-decoration: underline;">Ketan Talaulikar=0A=
 (ketant)</a><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Date:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;2020-01-30&nbsp;13:42<o:p></o:p></sp=
an></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">To:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:li_zhenqiang@hotmail=
.com" style=3D"color: blue; text-decoration: underline;">li_zhenqiang@hotma=
il.com</a>;=0A=
<a href=3D"mailto:chopps@chopps.org" style=3D"color: blue; text-decoration:=
 underline;">Christian Hopps</a>; <a href=3D"mailto:lsr@ietf.org" style=3D"=
color: blue; text-decoration: underline;">=0A=
lsr</a><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">CC:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-=
srv6-extensions@ietf.org" style=3D"color: blue; text-decoration: underline;=
">draft-li-lsr-ospfv3-srv6-extensions</a>;=0A=
<a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; text-decoration: =
underline;">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.org" style=3D"colo=
r: blue; text-decoration: underline;">=0A=
Christian Hopps</a>; <a href=3D"mailto:acee@cisco.com" style=3D"color: blue=
; text-decoration: underline;">Acee Lindem (acee)</a><o:p></o:p></span></p>=
=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Subject:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;T=
ahoma&quot;,sans-serif;color:black">&nbsp;RE: [Lsr] WG Adoption Call for dr=
aft-li-lsr-ospfv3-srv6-extensions<o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black;mso-fareast-l=
anguage:EN-US">Hello Zhenqiang Li,</span><span style=3D"color:black"><o:p><=
/o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black;mso-fareast-l=
anguage:EN-US">&nbsp;</span><span style=3D"color:black"><o:p></o:p></span><=
/p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black;mso-fareast-l=
anguage:EN-US">Thanks for your review and comments. Please check inline bel=
ow.</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black;mso-fareast-l=
anguage:EN-US">&nbsp;</span><span style=3D"color:black"><o:p></o:p></span><=
/p>=0A=
<div>=0A=
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><span lang=3D"EN-US" style=3D"color:b=
lack">From:</span></b><span lang=3D"EN-US" style=3D"color:black">=0A=
<a href=3D"mailto:li_zhenqiang@hotmail.com" style=3D"color: blue; text-deco=
ration: underline;">li_zhenqiang@hotmail.com</a> &lt;<a href=3D"mailto:li_z=
henqiang@hotmail.com" style=3D"color: blue; text-decoration: underline;">li=
_zhenqiang@hotmail.com</a>&gt;=0A=
<br>=0A=
<b>Sent:</b> 30 January 2020 08:46<br>=0A=
<b>To:</b> Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" style=
=3D"color: blue; text-decoration: underline;">chopps@chopps.org</a>&gt;; ls=
r &lt;<a href=3D"mailto:lsr@ietf.org" style=3D"color: blue; text-decoration=
: underline;">lsr@ietf.org</a>&gt;<br>=0A=
<b>Cc:</b> draft-li-lsr-ospfv3-srv6-extensions &lt;<a href=3D"mailto:draft-=
li-lsr-ospfv3-srv6-extensions@ietf.org" style=3D"color: blue; text-decorati=
on: underline;">draft-li-lsr-ospfv3-srv6-extensions@ietf.org</a>&gt;; lsr-a=
ds &lt;<a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; text-decor=
ation: underline;">lsr-ads@ietf.org</a>&gt;; Christian Hopps &lt;<a href=3D=
"mailto:chopps@chopps.org" style=3D"color: blue; text-decoration: underline=
;">chopps@chopps.org</a>&gt;;=0A=
 Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com" style=3D"color: b=
lue; text-decoration: underline;">acee@cisco.com</a>&gt;<br>=0A=
<b>Subject:</b> Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-ext=
ensions</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black">&nbsp;<o:p><=
/o:p></span></p>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">support the adoption with the follo=
wing comments.</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">1. What does SRH stack mean in sect=
ion 4.2? AS specified in RFC8200 and&nbsp;draft-ietf-6man-segment-routing-h=
eader, only one SRH can be presented in one IPv6 header.</span><span style=
=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">[KT] T=
hanks for catching this error and will fix as below:</span></i></b><span st=
yle=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">&nbsp;=
</span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;=
color:black">OLD: </span></i></b><span style=3D"color:black">The Maximum En=
d Pop MSD Type specifies the maximum number of SIDs in<o:p></o:p></span></p=
re>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; the top SRH in an SRH=
 stack to which the router can apply Penultimate</span><span style=3D"color=
:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;color:black">&nbsp;&nbsp; Segment Pop (PSP) or =
Ultimate Segment Pop (USP)</span><span style=3D"color:black"><o:p></o:p></s=
pan></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">&nbsp;=
</span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><b><i><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;=
color:black">NEW:</span></i></b><span style=3D"color:black"> The Maximum En=
d Pop MSD Type specifies the maximum number of SIDs in<o:p></o:p></span></p=
re>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><span style=3D"color:black">&nbsp;&nbsp; the SRH for which the r=
outer can apply Penultimate<o:p></o:p></span></pre>=0A=
<pre style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Cour=
ier New';"><span style=3D"color:black">&nbsp;&nbsp; Segment Pop (PSP) or Ul=
timate Segment Pop (USP)<o:p></o:p></span></pre>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black"><br>=0A=
<br>=0A=
<o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;color:re=
d">[ZQ] Fine.</span><span style=3D"font-size:10.5pt;color:black"><o:p></o:p=
></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black">&nbsp;<o:p><=
/o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">2. The abbreviations used in this d=
raft should be listed in a seperated section or point out where they are de=
fined.</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">[KT] W=
e=A1=AFve followed the convention of expanding on first use as also providi=
ng reference where necessary. Please do let know if we=A1=AFve missed doing=
 so anywhere.</span></i></b><span style=3D"color:black"><o:p></o:p></span><=
/p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;Microsoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></=
span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:14.5pt;color:re=
d">[ZQ] Some examples: SPF&nbsp;computation in secction 5, &nbsp;TBD in sec=
tion 2.</span><span style=3D"font-size:14.5pt;color:black"><o:p></o:p></spa=
n></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:#548235;mso-s=
tyle-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%">[KT]=
 Will expand SPF and some other such on first use :-). The TBD (to be decid=
ed) is for use until the code point are allocated=0A=
 by IANA.</span></i></b><span style=3D"color:#548235;mso-style-textfill-fil=
l-color:#548235;mso-style-textfill-fill-alpha:100.0%"><o:p></o:p></span></p=
>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"color:black">&nbsp;<o:p><=
/o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">3.&nbsp;Algorithm field is defined =
for End.x SID to carry the algorithm the end.x sid associates. But no&nbsp;=
algorithm field is defined for End SID in section 7. May I know the=0A=
 reason?</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">[KT] T=
he SRv6 Locator TLV that is the parent of the SRv6 End SID Sub-TLV carries =
the algorithm and hence there is no need to repeat in the Sub-TLV. This is =
not the case for SRv6 End.X SID Sub-TLV and hence=0A=
 it has the algorithm field.</span></i></b><span style=3D"color:black"><o:p=
></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black"><br>=
=0A=
<br>=0A=
</span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:14.5pt;color:re=
d">[ZQ] Make sense but still a little bit weird. Since any SID belongs to a=
 locator, or it is not routable, the algorithm field in the end.x sid is no=
t needed, end.x sid associates the algorithm carried=0A=
 in the corresponding locator tlv.</span><span style=3D"font-size:14.5pt;co=
lor:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoPlainText" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11p=
t; font-family: Calibri, sans-serif;"><b><i><span style=3D"color:#548235;ms=
o-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%">[=
KT]=0A=
</span><span style=3D"color:#548235;mso-style-textfill-fill-color:#548235;m=
so-style-textfill-fill-alpha:100.0%">Having an algorithm field advertised w=
ith the End.X SID makes it easier for implementation to find the algorithm =
specific End.X SID without making=0A=
 the longest prefix match on all locators advertised by the node to find th=
e algorithm to which the SID belongs. It also makes it possible to verify t=
hat the algorithm associated with the End.X SID matches that of the coverin=
g Locator when the link advertisement=0A=
 with End.X SID is received. <o:p></o:p></span></i></b></p>=0A=
<p class=3D"MsoPlainText" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11p=
t; font-family: Calibri, sans-serif;"><b><i><span style=3D"color:#548235;ms=
o-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%"><=
o:p>&nbsp;</o:p></span></i></b></p>=0A=
<p class=3D"MsoPlainText" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11p=
t; font-family: Calibri, sans-serif;"><b><i><span style=3D"color:#548235;ms=
o-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%">T=
hanks,<o:p></o:p></span></i></b></p>=0A=
<p class=3D"MsoPlainText" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11p=
t; font-family: Calibri, sans-serif;"><b><i><span style=3D"color:#548235;ms=
o-style-textfill-fill-color:#548235;mso-style-textfill-fill-alpha:100.0%">K=
etan</span></i></b><o:p></o:p></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">&nbsp;=
</span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">Thanks=
,</span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><b><i><span style=3D"color:black">Ketan<=
/span></i></b><span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Best Regards,</span><span style=3D"=
color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Zhenqiang Li</span><span style=3D"c=
olor:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<div class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt=
; font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-f=
amily:&quot;????&quot;,serif;color:black">=0A=
<hr size=3D"1" width=3D"210" style=3D"width:157.5pt" noshade=3D"" align=3D"=
left">=0A=
</span></div>=0A=
</div>=0A=
<div>=0A=
<div style=3D"margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-=
bottom:7.5pt">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Verdana&quot;,sans-serif;color:black"><a href=3D"mailto:li_zhenqi=
ang@hotmail.com" style=3D"color: blue; text-decoration: underline;">li_zhen=
qiang@hotmail.com</a></span><span style=3D"color:black"><o:p></o:p></span><=
/p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<blockquote style=3D"margin-left: 6pt; margin-top: 0px;">=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">From:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:chopps@chopps.org"=
 style=3D"color: blue; text-decoration: underline;">Christian=0A=
 Hopps</a></span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Date:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;color:black">&nbsp;2020-01-24&nbsp;04:24</span><span st=
yle=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">To:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:lsr@ietf.org" style=
=3D"color: blue; text-decoration: underline;">lsr</a></span><span style=3D"=
color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">CC:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;Tahoma=
&quot;,sans-serif;color:black">&nbsp;<a href=3D"mailto:draft-li-lsr-ospfv3-=
srv6-extensions@ietf.org" style=3D"color: blue; text-decoration: underline;=
">draft-li-lsr-ospfv3-srv6-extensions</a>;=0A=
<a href=3D"mailto:lsr-ads@ietf.org" style=3D"color: blue; text-decoration: =
underline;">lsr-ads</a>; <a href=3D"mailto:chopps@chopps.org" style=3D"colo=
r: blue; text-decoration: underline;">=0A=
Christian Hopps</a>; <a href=3D"mailto:acee@cisco.com" style=3D"color: blue=
; text-decoration: underline;">Acee Lindem \(acee\)</a></span><span style=
=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; background: rgb(239, 239, 239);"><b><span=
 style=3D"font-size:9.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:b=
lack">Subject:</span></b><span style=3D"font-size:9.0pt;font-family:&quot;T=
ahoma&quot;,sans-serif;color:black">&nbsp;[Lsr] WG Adoption Call for draft-=
li-lsr-ospfv3-srv6-extensions</span><span style=3D"color:black"><o:p></o:p>=
</span></p>=0A=
</div>=0A=
</div>=0A=
</div>=0A=
<div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Hi LSR WG and Draft Authors,</span>=
<span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">The authors originally requested ad=
option back @ 105; however, some comments were received and new version was=
 produced. Moving forward...</span><span style=3D"color:black"><o:p></o:p><=
/span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">This begins a 2 week WG adoption po=
ll for the following draft:</span><span style=3D"color:black"><o:p></o:p></=
span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;=0A=
<a href=3D"https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extens=
ions/" style=3D"color: blue; text-decoration: underline;">https://datatrack=
er.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/</a></span><span style=
=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Please indicate your support or obj=
ection by Feb 6, 2020.</span><span style=3D"color:black"><o:p></o:p></span>=
</p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Authors, please respond indicating =
whether you are aware of any IPR that applies to this draft.</span><span st=
yle=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">&nbsp;</span><span style=3D"color:b=
lack"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Thanks,</span><span style=3D"color:=
black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Chris &amp; Acee.</span><span style=
=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">___________________________________=
____________</span><span style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black">Lsr mailing list</span><span style=
=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><a href=3D"mailto:Lsr@ietf.org" sty=
le=3D"color: blue; text-decoration: underline;">Lsr@ietf.org</a></span><spa=
n style=3D"color:black"><o:p></o:p></span></p>=0A=
</div>=0A=
<div>=0A=
<p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size:10.5pt;font-fam=
ily:&quot;????&quot;,serif;color:black"><a href=3D"https://www.ietf.org/mai=
lman/listinfo/lsr" style=3D"color: blue; text-decoration: underline;">https=
://www.ietf.org/mailman/listinfo/lsr</a></span><span style=3D"color:black">=
<o:p></o:p></span></p>=0A=
</div>=0A=
</div>=0A=
</blockquote>=0A=
</div>=0A=
</div>=0A=
</blockquote>=0A=
</div>=0A=
</div></div></blockquote>=0A=
</body></html>=

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
Thread-Index: AQHV14JMeaBNUvcna0KLGQSdwObJEQ==
Date: Thu, 30 Jan 2020 15:31:11 +0000
Message-ID: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com>
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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To: "Acee Lindem (acee)" <acee@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
Cc: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hi Acee,

On 30/01/2020 17:11, Acee Lindem (acee) wrote:
> Hi Ketan,
> 
> In that case, it doesn’t make sense to include it in the End.X 
> advertisement since you need to look it up to check it anyway. I don’t 
> see any benefit here.
The benefit is to make sure that the END.X SID that was configured for 
the algo X is covered by the locator that has the same algo.

If you do not advertise the algo with END.X SID, you have no way of 
checking that on rcv side.

thanks,
Peter

> 
> Thanks,
> 
> Acee
> 
> *From: *"Ketan Talaulikar (ketant)" <ketant@cisco.com>
> *Date: *Thursday, January 30, 2020 at 11:06 AM
> *To: *Acee Lindem <acee@cisco.com>, "li_zhenqiang@hotmail.com" 
> <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr 
> <lsr@ietf.org>
> *Cc: *draft-li-lsr-ospfv3-srv6-extensions 
> <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
> *Subject: *RE: [Lsr] WG Adoption Call for 
> draft-li-lsr-ospfv3-srv6-extensions
> 
> Hi Acee/Zhen,
> 
> The sec 8 of the draft has the following text which specifies the 
> handling of this condition.
> 
>     All End.X SIDs MUST be subsumed by the subnet of a Locator with the
> 
>     matching algorithm which is advertised by the same node in an SRv6
> 
>     Locator TLV.  End.X SIDs which do not meet this requirement MUST be
> 
>     ignored.
> 
> Thanks,
> 
> Ketan
> 
> *From:* Acee Lindem (acee) <acee@cisco.com>
> *Sent:* 30 January 2020 21:01
> *To:* li_zhenqiang@hotmail.com; Ketan Talaulikar (ketant) 
> <ketant@cisco.com>; Christian Hopps <chopps@chopps.org>; lsr <lsr@ietf.org>
> *Cc:* draft-li-lsr-ospfv3-srv6-extensions 
> <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads <lsr-ads@ietf.org>
> *Subject:* Re: [Lsr] WG Adoption Call for 
> draft-li-lsr-ospfv3-srv6-extensions
> 
> Hi Ketan, Zhen,
> 
> What happens if there an algorithm conflict between the Adjacency END.X 
> SID and the longest match Locator SID? Either one has to take precedence 
> or this is an error condition. In either case, it needs to be documented.
> 
> Thanks,
> 
> Acee
> 
> *From: *"li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>" 
> <li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>>
> *Date: *Thursday, January 30, 2020 at 10:20 AM
> *To: *"Ketan Talaulikar (ketant)" <ketant@cisco.com 
> <mailto:ketant@cisco.com>>, Christian Hopps <chopps@chopps.org 
> <mailto:chopps@chopps.org>>, lsr <lsr@ietf.org <mailto:lsr@ietf.org>>
> *Cc: *draft-li-lsr-ospfv3-srv6-extensions 
> <draft-li-lsr-ospfv3-srv6-extensions@ietf.org 
> <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>, lsr-ads 
> <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>, Christian Hopps 
> <chopps@chopps.org <mailto:chopps@chopps.org>>, Acee Lindem 
> <acee@cisco.com <mailto:acee@cisco.com>>
> *Subject: *Re: RE: [Lsr] WG Adoption Call for 
> draft-li-lsr-ospfv3-srv6-extensions
> 
> For the third concern, I think it is better to list the considerations 
> behind the format design of the TLVs to help readers understand them 
> better. For the specification behavior you mention, this doc SHOULD 
> specify it explicitly.
> 
> By the way, what a router should do when it receives END.X SID 
> containing algorithm that is different from the one carried in the 
> convering locator?
> 
> Best Regards,
> 
> Zhenqiang Li
> 
> ------------------------------------------------------------------------
> 
> li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
> 
>     *From:*Ketan Talaulikar (ketant) <mailto:ketant@cisco.com>
> 
>     *Date:* 2020-01-30 16:44
> 
>     *To:*li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>;
>     Christian Hopps <mailto:chopps@chopps.org>; lsr <mailto:lsr@ietf.org>
> 
>     *CC:*draft-li-lsr-ospfv3-srv6-extensions
>     <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads
>     <mailto:lsr-ads@ietf.org>; Christian Hopps
>     <mailto:chopps@chopps.org>; Acee Lindem (acee) <mailto:acee@cisco.com>
> 
>     *Subject:* RE: RE: [Lsr] WG Adoption Call for
>     draft-li-lsr-ospfv3-srv6-extensions
> 
>     Please check inline again.
> 
>     *From:* li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
>     <li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>>
>     *Sent:* 30 January 2020 13:46
>     *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
>     <mailto:ketant@cisco.com>>; Christian Hopps <chopps@chopps.org
>     <mailto:chopps@chopps.org>>; lsr <lsr@ietf.org <mailto:lsr@ietf.org>>
>     *Cc:* draft-li-lsr-ospfv3-srv6-extensions
>     <draft-li-lsr-ospfv3-srv6-extensions@ietf.org
>     <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>; lsr-ads
>     <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>; Christian Hopps
>     <chopps@chopps.org <mailto:chopps@chopps.org>>; Acee Lindem (acee)
>     <acee@cisco.com <mailto:acee@cisco.com>>
>     *Subject:* Re: RE: [Lsr] WG Adoption Call for
>     draft-li-lsr-ospfv3-srv6-extensions
> 
>     Thank you KT for your quick response. Please see my reply begins
>     with [ZQ].
> 
>     Best Regards,
> 
>     Zhenqiang Li
> 
>     ------------------------------------------------------------------------
> 
>     li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
> 
>         *From:*Ketan Talaulikar (ketant) <mailto:ketant@cisco.com>
> 
>         *Date:* 2020-01-30 13:42
> 
>         *To:*li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>;
>         Christian Hopps <mailto:chopps@chopps.org>; lsr
>         <mailto:lsr@ietf.org>
> 
>         *CC:*draft-li-lsr-ospfv3-srv6-extensions
>         <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads
>         <mailto:lsr-ads@ietf.org>; Christian Hopps
>         <mailto:chopps@chopps.org>; Acee Lindem (acee)
>         <mailto:acee@cisco.com>
> 
>         *Subject:* RE: [Lsr] WG Adoption Call for
>         draft-li-lsr-ospfv3-srv6-extensions
> 
>         Hello Zhenqiang Li,
> 
>         Thanks for your review and comments. Please check inline below.
> 
>         *From:*li_zhenqiang@hotmail.com
>         <mailto:li_zhenqiang@hotmail.com> <li_zhenqiang@hotmail.com
>         <mailto:li_zhenqiang@hotmail.com>>
>         *Sent:* 30 January 2020 08:46
>         *To:* Christian Hopps <chopps@chopps.org
>         <mailto:chopps@chopps.org>>; lsr <lsr@ietf.org
>         <mailto:lsr@ietf.org>>
>         *Cc:* draft-li-lsr-ospfv3-srv6-extensions
>         <draft-li-lsr-ospfv3-srv6-extensions@ietf.org
>         <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>; lsr-ads
>         <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>; Christian Hopps
>         <chopps@chopps.org <mailto:chopps@chopps.org>>; Acee Lindem
>         (acee) <acee@cisco.com <mailto:acee@cisco.com>>
>         *Subject:* Re: [Lsr] WG Adoption Call for
>         draft-li-lsr-ospfv3-srv6-extensions
> 
>         support the adoption with the following comments.
> 
>         1. What does SRH stack mean in section 4.2? AS specified in
>         RFC8200 and draft-ietf-6man-segment-routing-header, only one SRH
>         can be presented in one IPv6 header.
> 
>         */[KT] Thanks for catching this error and will fix as below:/*
> 
>         *//*
> 
>         */OLD: /*The Maximum End Pop MSD Type specifies the maximum number of SIDs in
> 
>             the top SRH in an SRH stack to which the router can apply
>         Penultimate
> 
>             Segment Pop (PSP) or Ultimate Segment Pop (USP)
> 
>         *//*
> 
>         */NEW:/*The Maximum End Pop MSD Type specifies the maximum number of SIDs in
> 
>             the SRH for which the router can apply Penultimate
> 
>             Segment Pop (PSP) or Ultimate Segment Pop (USP)
> 
> 
> 
> 
>         [ZQ] Fine.
> 
>         2. The abbreviations used in this draft should be listed in a
>         seperated section or point out where they are defined.
> 
>         */[KT] We’ve followed the convention of expanding on first use
>         as also providing reference where necessary. Please do let know
>         if we’ve missed doing so anywhere./*
> 
>         [ZQ] Some examples: SPF computation in secction 5,  TBD in
>         section 2.
> 
>         */[KT] Will expand SPF and some other such on first use :-). The
>         TBD (to be decided) is for use until the code point are
>         allocated by IANA./*
> 
>         3. Algorithm field is defined for End.x SID to carry the
>         algorithm the end.x sid associates. But no algorithm field is
>         defined for End SID in section 7. May I know the reason?
> 
>         */[KT] The SRv6 Locator TLV that is the parent of the SRv6 End
>         SID Sub-TLV carries the algorithm and hence there is no need to
>         repeat in the Sub-TLV. This is not the case for SRv6 End.X SID
>         Sub-TLV and hence it has the algorithm field./*
> 
>         */
> 
> 
>         /*
> 
>         [ZQ] Make sense but still a little bit weird. Since any SID
>         belongs to a locator, or it is not routable, the algorithm field
>         in the end.x sid is not needed, end.x sid associates the
>         algorithm carried in the corresponding locator tlv.
> 
>         */[KT] Having an algorithm field advertised with the End.X SID
>         makes it easier for implementation to find the algorithm
>         specific End.X SID without making the longest prefix match on
>         all locators advertised by the node to find the algorithm to
>         which the SID belongs. It also makes it possible to verify that
>         the algorithm associated with the End.X SID matches that of the
>         covering Locator when the link advertisement with End.X SID is
>         received. /*
> 
>         *//*
> 
>         */Thanks,/*
> 
>         */Ketan/*
> 
>         *//*
> 
>         */Thanks,/*
> 
>         */Ketan/*
> 
>         Best Regards,
> 
>         Zhenqiang Li
> 
>         ------------------------------------------------------------------------
> 
>         li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
> 
>             *From:*Christian Hopps <mailto:chopps@chopps.org>
> 
>             *Date:* 2020-01-24 04:24
> 
>             *To:*lsr <mailto:lsr@ietf.org>
> 
>             *CC:*draft-li-lsr-ospfv3-srv6-extensions
>             <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>;
>             lsr-ads <mailto:lsr-ads@ietf.org>; Christian Hopps
>             <mailto:chopps@chopps.org>; Acee Lindem \(acee\)
>             <mailto:acee@cisco.com>
> 
>             *Subject:* [Lsr] WG Adoption Call for
>             draft-li-lsr-ospfv3-srv6-extensions
> 
>             Hi LSR WG and Draft Authors,
> 
>             The authors originally requested adoption back @ 105;
>             however, some comments were received and new version was
>             produced. Moving forward...
> 
>             This begins a 2 week WG adoption poll for the following draft:
> 
>             https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
> 
>             Please indicate your support or objection by Feb 6, 2020.
> 
>             Authors, please respond indicating whether you are aware of
>             any IPR that applies to this draft.
> 
>             Thanks,
> 
>             Chris & Acee.
> 
>             _______________________________________________
> 
>             Lsr mailing list
> 
>             Lsr@ietf.org <mailto:Lsr@ietf.org>
> 
>             https://www.ietf.org/mailman/listinfo/lsr
> 


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>,  Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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To: "Acee Lindem (acee)" <acee@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
Cc: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Thu, 30 Jan 2020 18:24:29 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/WOPDE0PDZNhz51MFgmhZQL2TtAA>
Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Hi Acee,

On 30/01/2020 18:12, Acee Lindem (acee) wrote:
> Hi Peter,
> 
> On 1/30/20, 11:36 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:
> 
>      Hi Acee,
>      
>      On 30/01/2020 17:11, Acee Lindem (acee) wrote:
>      > Hi Ketan,
>      >
>      > In that case, it doesn’t make sense to include it in the End.X
>      > advertisement since you need to look it up to check it anyway. I don’t
>      > see any benefit here.
>      The benefit is to make sure that the END.X SID that was configured for
>      the algo X is covered by the locator that has the same algo.
>      
>      If you do not advertise the algo with END.X SID, you have no way of
>      checking that on rcv side.
> 
> Ok - so it is to verify that algorithm for the adjacency matches that algorithm for the longest match locator - which may be advertised by a >different OSPFv3 router. Correct? 

yes.


>I guess I don't see why the algorithm for the END.X SID just isn't defined as the algorithm from the longest match locator. That way, everyone in >the area would use the same one and there would be less that could go wrong. What am I missing?

locators may change over time. During the reconfiguration a END.X SID 
may wrongly be associated with the incorrect locator from a different algo.

Also if for some reason the right locator is not advertised (due to a 
bug on the originator), END.X SID traffic may be sent using a wrong 
algo. We wanted to avoid it as that can be seen as a security issue.

thanks,
Peter



> 
> Thanks,
> Acee
> 
>      
>      thanks,
>      Peter
>      
>      >
>      > Thanks,
>      >
>      > Acee
>      >
>      > *From: *"Ketan Talaulikar (ketant)" <ketant@cisco.com>
>      > *Date: *Thursday, January 30, 2020 at 11:06 AM
>      > *To: *Acee Lindem <acee@cisco.com>, "li_zhenqiang@hotmail.com"
>      > <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr
>      > <lsr@ietf.org>
>      > *Cc: *draft-li-lsr-ospfv3-srv6-extensions
>      > <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
>      > *Subject: *RE: [Lsr] WG Adoption Call for
>      > draft-li-lsr-ospfv3-srv6-extensions
>      >
>      > Hi Acee/Zhen,
>      >
>      > The sec 8 of the draft has the following text which specifies the
>      > handling of this condition.
>      >
>      >     All End.X SIDs MUST be subsumed by the subnet of a Locator with the
>      >
>      >     matching algorithm which is advertised by the same node in an SRv6
>      >
>      >     Locator TLV.  End.X SIDs which do not meet this requirement MUST be
>      >
>      >     ignored.
>      >
>      > Thanks,
>      >
>      > Ketan
>      >
>      > *From:* Acee Lindem (acee) <acee@cisco.com>
>      > *Sent:* 30 January 2020 21:01
>      > *To:* li_zhenqiang@hotmail.com; Ketan Talaulikar (ketant)
>      > <ketant@cisco.com>; Christian Hopps <chopps@chopps.org>; lsr <lsr@ietf.org>
>      > *Cc:* draft-li-lsr-ospfv3-srv6-extensions
>      > <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads <lsr-ads@ietf.org>
>      > *Subject:* Re: [Lsr] WG Adoption Call for
>      > draft-li-lsr-ospfv3-srv6-extensions
>      >
>      > Hi Ketan, Zhen,
>      >
>      > What happens if there an algorithm conflict between the Adjacency END.X
>      > SID and the longest match Locator SID? Either one has to take precedence
>      > or this is an error condition. In either case, it needs to be documented.
>      >
>      > Thanks,
>      >
>      > Acee
>      >
>      > *From: *"li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>"
>      > <li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>>
>      > *Date: *Thursday, January 30, 2020 at 10:20 AM
>      > *To: *"Ketan Talaulikar (ketant)" <ketant@cisco.com
>      > <mailto:ketant@cisco.com>>, Christian Hopps <chopps@chopps.org
>      > <mailto:chopps@chopps.org>>, lsr <lsr@ietf.org <mailto:lsr@ietf.org>>
>      > *Cc: *draft-li-lsr-ospfv3-srv6-extensions
>      > <draft-li-lsr-ospfv3-srv6-extensions@ietf.org
>      > <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>, lsr-ads
>      > <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>, Christian Hopps
>      > <chopps@chopps.org <mailto:chopps@chopps.org>>, Acee Lindem
>      > <acee@cisco.com <mailto:acee@cisco.com>>
>      > *Subject: *Re: RE: [Lsr] WG Adoption Call for
>      > draft-li-lsr-ospfv3-srv6-extensions
>      >
>      > For the third concern, I think it is better to list the considerations
>      > behind the format design of the TLVs to help readers understand them
>      > better. For the specification behavior you mention, this doc SHOULD
>      > specify it explicitly.
>      >
>      > By the way, what a router should do when it receives END.X SID
>      > containing algorithm that is different from the one carried in the
>      > convering locator?
>      >
>      > Best Regards,
>      >
>      > Zhenqiang Li
>      >
>      > ------------------------------------------------------------------------
>      >
>      > li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
>      >
>      >     *From:*Ketan Talaulikar (ketant) <mailto:ketant@cisco.com>
>      >
>      >     *Date:* 2020-01-30 16:44
>      >
>      >     *To:*li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>;
>      >     Christian Hopps <mailto:chopps@chopps.org>; lsr <mailto:lsr@ietf.org>
>      >
>      >     *CC:*draft-li-lsr-ospfv3-srv6-extensions
>      >     <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads
>      >     <mailto:lsr-ads@ietf.org>; Christian Hopps
>      >     <mailto:chopps@chopps.org>; Acee Lindem (acee) <mailto:acee@cisco.com>
>      >
>      >     *Subject:* RE: RE: [Lsr] WG Adoption Call for
>      >     draft-li-lsr-ospfv3-srv6-extensions
>      >
>      >     Please check inline again.
>      >
>      >     *From:* li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
>      >     <li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>>
>      >     *Sent:* 30 January 2020 13:46
>      >     *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
>      >     <mailto:ketant@cisco.com>>; Christian Hopps <chopps@chopps.org
>      >     <mailto:chopps@chopps.org>>; lsr <lsr@ietf.org <mailto:lsr@ietf.org>>
>      >     *Cc:* draft-li-lsr-ospfv3-srv6-extensions
>      >     <draft-li-lsr-ospfv3-srv6-extensions@ietf.org
>      >     <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>; lsr-ads
>      >     <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>; Christian Hopps
>      >     <chopps@chopps.org <mailto:chopps@chopps.org>>; Acee Lindem (acee)
>      >     <acee@cisco.com <mailto:acee@cisco.com>>
>      >     *Subject:* Re: RE: [Lsr] WG Adoption Call for
>      >     draft-li-lsr-ospfv3-srv6-extensions
>      >
>      >     Thank you KT for your quick response. Please see my reply begins
>      >     with [ZQ].
>      >
>      >     Best Regards,
>      >
>      >     Zhenqiang Li
>      >
>      >     ------------------------------------------------------------------------
>      >
>      >     li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
>      >
>      >         *From:*Ketan Talaulikar (ketant) <mailto:ketant@cisco.com>
>      >
>      >         *Date:* 2020-01-30 13:42
>      >
>      >         *To:*li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>;
>      >         Christian Hopps <mailto:chopps@chopps.org>; lsr
>      >         <mailto:lsr@ietf.org>
>      >
>      >         *CC:*draft-li-lsr-ospfv3-srv6-extensions
>      >         <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>; lsr-ads
>      >         <mailto:lsr-ads@ietf.org>; Christian Hopps
>      >         <mailto:chopps@chopps.org>; Acee Lindem (acee)
>      >         <mailto:acee@cisco.com>
>      >
>      >         *Subject:* RE: [Lsr] WG Adoption Call for
>      >         draft-li-lsr-ospfv3-srv6-extensions
>      >
>      >         Hello Zhenqiang Li,
>      >
>      >         Thanks for your review and comments. Please check inline below.
>      >
>      >         *From:*li_zhenqiang@hotmail.com
>      >         <mailto:li_zhenqiang@hotmail.com> <li_zhenqiang@hotmail.com
>      >         <mailto:li_zhenqiang@hotmail.com>>
>      >         *Sent:* 30 January 2020 08:46
>      >         *To:* Christian Hopps <chopps@chopps.org
>      >         <mailto:chopps@chopps.org>>; lsr <lsr@ietf.org
>      >         <mailto:lsr@ietf.org>>
>      >         *Cc:* draft-li-lsr-ospfv3-srv6-extensions
>      >         <draft-li-lsr-ospfv3-srv6-extensions@ietf.org
>      >         <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>>; lsr-ads
>      >         <lsr-ads@ietf.org <mailto:lsr-ads@ietf.org>>; Christian Hopps
>      >         <chopps@chopps.org <mailto:chopps@chopps.org>>; Acee Lindem
>      >         (acee) <acee@cisco.com <mailto:acee@cisco.com>>
>      >         *Subject:* Re: [Lsr] WG Adoption Call for
>      >         draft-li-lsr-ospfv3-srv6-extensions
>      >
>      >         support the adoption with the following comments.
>      >
>      >         1. What does SRH stack mean in section 4.2? AS specified in
>      >         RFC8200 and draft-ietf-6man-segment-routing-header, only one SRH
>      >         can be presented in one IPv6 header.
>      >
>      >         */[KT] Thanks for catching this error and will fix as below:/*
>      >
>      >         *//*
>      >
>      >         */OLD: /*The Maximum End Pop MSD Type specifies the maximum number of SIDs in
>      >
>      >             the top SRH in an SRH stack to which the router can apply
>      >         Penultimate
>      >
>      >             Segment Pop (PSP) or Ultimate Segment Pop (USP)
>      >
>      >         *//*
>      >
>      >         */NEW:/*The Maximum End Pop MSD Type specifies the maximum number of SIDs in
>      >
>      >             the SRH for which the router can apply Penultimate
>      >
>      >             Segment Pop (PSP) or Ultimate Segment Pop (USP)
>      >
>      >
>      >
>      >
>      >         [ZQ] Fine.
>      >
>      >         2. The abbreviations used in this draft should be listed in a
>      >         seperated section or point out where they are defined.
>      >
>      >         */[KT] We’ve followed the convention of expanding on first use
>      >         as also providing reference where necessary. Please do let know
>      >         if we’ve missed doing so anywhere./*
>      >
>      >         [ZQ] Some examples: SPF computation in secction 5,  TBD in
>      >         section 2.
>      >
>      >         */[KT] Will expand SPF and some other such on first use :-). The
>      >         TBD (to be decided) is for use until the code point are
>      >         allocated by IANA./*
>      >
>      >         3. Algorithm field is defined for End.x SID to carry the
>      >         algorithm the end.x sid associates. But no algorithm field is
>      >         defined for End SID in section 7. May I know the reason?
>      >
>      >         */[KT] The SRv6 Locator TLV that is the parent of the SRv6 End
>      >         SID Sub-TLV carries the algorithm and hence there is no need to
>      >         repeat in the Sub-TLV. This is not the case for SRv6 End.X SID
>      >         Sub-TLV and hence it has the algorithm field./*
>      >
>      >         */
>      >
>      >
>      >         /*
>      >
>      >         [ZQ] Make sense but still a little bit weird. Since any SID
>      >         belongs to a locator, or it is not routable, the algorithm field
>      >         in the end.x sid is not needed, end.x sid associates the
>      >         algorithm carried in the corresponding locator tlv.
>      >
>      >         */[KT] Having an algorithm field advertised with the End.X SID
>      >         makes it easier for implementation to find the algorithm
>      >         specific End.X SID without making the longest prefix match on
>      >         all locators advertised by the node to find the algorithm to
>      >         which the SID belongs. It also makes it possible to verify that
>      >         the algorithm associated with the End.X SID matches that of the
>      >         covering Locator when the link advertisement with End.X SID is
>      >         received. /*
>      >
>      >         *//*
>      >
>      >         */Thanks,/*
>      >
>      >         */Ketan/*
>      >
>      >         *//*
>      >
>      >         */Thanks,/*
>      >
>      >         */Ketan/*
>      >
>      >         Best Regards,
>      >
>      >         Zhenqiang Li
>      >
>      >         ------------------------------------------------------------------------
>      >
>      >         li_zhenqiang@hotmail.com <mailto:li_zhenqiang@hotmail.com>
>      >
>      >             *From:*Christian Hopps <mailto:chopps@chopps.org>
>      >
>      >             *Date:* 2020-01-24 04:24
>      >
>      >             *To:*lsr <mailto:lsr@ietf.org>
>      >
>      >             *CC:*draft-li-lsr-ospfv3-srv6-extensions
>      >             <mailto:draft-li-lsr-ospfv3-srv6-extensions@ietf.org>;
>      >             lsr-ads <mailto:lsr-ads@ietf.org>; Christian Hopps
>      >             <mailto:chopps@chopps.org>; Acee Lindem \(acee\)
>      >             <mailto:acee@cisco.com>
>      >
>      >             *Subject:* [Lsr] WG Adoption Call for
>      >             draft-li-lsr-ospfv3-srv6-extensions
>      >
>      >             Hi LSR WG and Draft Authors,
>      >
>      >             The authors originally requested adoption back @ 105;
>      >             however, some comments were received and new version was
>      >             produced. Moving forward...
>      >
>      >             This begins a 2 week WG adoption poll for the following draft:
>      >
>      >             https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/
>      >
>      >             Please indicate your support or objection by Feb 6, 2020.
>      >
>      >             Authors, please respond indicating whether you are aware of
>      >             any IPR that applies to this draft.
>      >
>      >             Thanks,
>      >
>      >             Chris & Acee.
>      >
>      >             _______________________________________________
>      >
>      >             Lsr mailing list
>      >
>      >             Lsr@ietf.org <mailto:Lsr@ietf.org>
>      >
>      >             https://www.ietf.org/mailman/listinfo/lsr
>      >
>      
>      
> 
> 
> 


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>,  Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/LRcbU_e0cpmAkEI8YmraAI3rBr4>
Subject: Re: [Lsr] IS-IS Requirements for Area Abstraction (Corrected Alias for ADs)
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Acee and Chris,
The flood-reflector draft solves a legitimate problem for large networks. T=
his is of high interest.

Thanks,
Alankar





On January 27, 2020 at 1:27:13 PM, Acee Lindem (acee) (acee@cisco.com<mailt=
o:acee@cisco.com>)

wrote:



Speaking as WG Co-chair:







At IETF 107, we had a protracted discussion of several drafts having  goal

of reducing the amount of link-state information that must be flooded into

the level-2 area. We have two drafts that do this essentially via

abstraction of the level-1 areas. These are:







https://www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt



https://www.ietf.org/id/draft-chen-isis-ttz-07.txt







There are various reasons why these drafts can't consolidated involving

both IPR and government restrictions. Refer to

https://datatracker.ietf.org/meeting/106/materials/minutes-106-lsr-00 for

the complete discussion.







We have another draft that also reduces the amount of link-state

information each IS-IS router must maintain but using IS-IS reflectors.

This is slightly different but also avoids leaking all the level-1 area

link-state to the level-2 area.







https://www.ietf.org/id/draft-przygienda-lsr-flood-reflection-01.txt







Given the amount of overlap and the conflicts amongst these drafts, the

chairs/Ads are now asking whether there is a really a strong requirement to

advance one or more of these documents. Especially given that we are

already moving forward with both IS-IS/OSPF flooding reductions and the

Hierarchal IS-IS work. Additionally,  we anticipate we'll reach an impasse

in consolidating these drafts. We'd really like to hear from the operators

that would deploy these mechanisms.







Thanks,

Acee and Chris

  *   [Lsr] IS-IS Requirements for Area Abstraction (...<https://mailarchiv=
e.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY>  Acee Lindem (acee)
  *   Re: [Lsr] IS-IS Requirements for Area Abstracti...<https://mailarchiv=
e.ietf.org/arch/msg/lsr/jJQ46a8JaoR0zGPXrHFXMDj_l2A>  Alvaro Retana
  *   Re: [Lsr] IS-IS Requirements for Area Abstracti...<https://mailarchiv=
e.ietf.org/arch/msg/lsr/_OH-yLPTmp41xpSVxGKqH87iJWU>  Tony Przygienda


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Acee and Chris,<o:p></o:p></p>
<p class=3D"MsoNormal">The flood-reflector draft solves a legitimate proble=
m for large networks. This is of high interest.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Alankar<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>On January 27, 2020 at 1:27:13 PM, Acee Lindem (acee) (<a href=3D"mail=
to:acee@cisco.com">acee@cisco.com</a>)<o:p></o:p></pre>
<pre>wrote:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Speaking as WG Co-chair:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>At IETF 107, we had a protracted discussion of several drafts having&n=
bsp; goal<o:p></o:p></pre>
<pre>of reducing the amount of link-state information that must be flooded =
into<o:p></o:p></pre>
<pre>the level-2 area. We have two drafts that do this essentially via<o:p>=
</o:p></pre>
<pre>abstraction of the level-1 areas. These are:<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><a href=3D"https://www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt=
">https://www.ietf.org/id/draft-li-lsr-isis-area-proxy-01.txt</a><o:p></o:p=
></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><a href=3D"https://www.ietf.org/id/draft-chen-isis-ttz-07.txt">https:/=
/www.ietf.org/id/draft-chen-isis-ttz-07.txt</a><o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>There are various reasons why these drafts can&#8217;t consolidated in=
volving<o:p></o:p></pre>
<pre>both IPR and government restrictions. Refer to<o:p></o:p></pre>
<pre><a href=3D"https://datatracker.ietf.org/meeting/106/materials/minutes-=
106-lsr-00">https://datatracker.ietf.org/meeting/106/materials/minutes-106-=
lsr-00</a> for<o:p></o:p></pre>
<pre>the complete discussion.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>We have another draft that also reduces the amount of link-state<o:p><=
/o:p></pre>
<pre>information each IS-IS router must maintain but using IS-IS reflectors=
.<o:p></o:p></pre>
<pre>This is slightly different but also avoids leaking all the level-1 are=
a<o:p></o:p></pre>
<pre>link-state to the level-2 area.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><a href=3D"https://www.ietf.org/id/draft-przygienda-lsr-flood-reflecti=
on-01.txt">https://www.ietf.org/id/draft-przygienda-lsr-flood-reflection-01=
.txt</a><o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Given the amount of overlap and the conflicts amongst these drafts, th=
e<o:p></o:p></pre>
<pre>chairs/Ads are now asking whether there is a really a strong requireme=
nt to<o:p></o:p></pre>
<pre>advance one or more of these documents. Especially given that we are<o=
:p></o:p></pre>
<pre>already moving forward with both IS-IS/OSPF flooding reductions and th=
e<o:p></o:p></pre>
<pre>Hierarchal IS-IS work. Additionally,&nbsp; we anticipate we&#8217;ll r=
each an impasse<o:p></o:p></pre>
<pre>in consolidating these drafts. We&#8217;d really like to hear from the=
 operators<o:p></o:p></pre>
<pre>that would deploy these mechanisms.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Thanks,<o:p></o:p></pre>
<pre>Acee and Chris<o:p></o:p></pre>
<ul type=3D"disc">
<li class=3D"depth-0" style=3D"mso-list:l0 level1 lfo2"><a href=3D"https://=
mailarchive.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY">[Lsr] IS-IS =
Requirements for Area Abstraction (...</a>&nbsp;&nbsp;Acee Lindem (acee)<o:=
p></o:p></li><li class=3D"depth-1" style=3D"mso-list:l0 level1 lfo2"><a hre=
f=3D"https://mailarchive.ietf.org/arch/msg/lsr/jJQ46a8JaoR0zGPXrHFXMDj_l2A"=
>Re: [Lsr] IS-IS Requirements for Area Abstracti...</a>&nbsp;&nbsp;Alvaro R=
etana<o:p></o:p></li><li class=3D"depth-1" style=3D"mso-list:l0 level1 lfo2=
"><a href=3D"https://mailarchive.ietf.org/arch/msg/lsr/_OH-yLPTmp41xpSVxGKq=
H87iJWU">Re: [Lsr] IS-IS Requirements for Area Abstracti...</a>&nbsp;&nbsp;=
Tony Przygienda<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
CC: draft-li-lsr-ospfv3-srv6-extensions <draft-li-lsr-ospfv3-srv6-extensions@ietf.org>, lsr-ads <lsr-ads@ietf.org>
Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
Thread-Index: AQHV14JMeaBNUvcna0KLGQSdwObJEagDXuqA//+uLICAAFrIAP//tiUAgABXOYD//64xgAAx7mrQ//+vJQA=
Date: Fri, 31 Jan 2020 12:31:59 +0000
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "li_zhenqiang@hotmail.com" <li_zhenqiang@hotmail.com>, Christian Hopps <chopps@chopps.org>, lsr <lsr@ietf.org>
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Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions
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From: Chris Bowers <chrisbowers.ietf@gmail.com>
Date: Fri, 31 Jan 2020 14:10:41 -0600
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To: Peter Psenak <ppsenak@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Cc: lsr@ietf.org, lsr-ads@ietf.org, Christian Hopps <chopps@chopps.org>,  "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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Peter and Les,

It seems to me that for the Node Flag in RFC7794 and the proposed Anycast Flag

in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately concerned with

how to identify IGP-Node Segments and IGP-Anycast Segments, as defined
in RFC8402,

the Segment Routing Architecture document.



If this is the case, then the following text from RFC8402 is very relevant.

============

3.2.  IGP-Node Segment (Node-SID)



   An IGP Node-SID MUST NOT be associated with a prefix that is owned by

   more than one router within the same routing domain.



3.3.  IGP-Anycast Segment (Anycast-SID)

   ....

   An IGP-Anycast segment MUST NOT reference a particular node.

   ....

============

This text can be interpreted in two different ways.



Interpretation I)

A prefix-SID can have the following three possible states.

Ia) Node-SID

Ib) Anycast-SID

Ic) neither Node-SID nor Anycast-SID



Interpretation II)

A prefix-SID can have the following two possible states.

IIa) Node-SID

IIb) Anycast-SID



If Interpretation I) is correct, then I think that the current encodings in

draft-ietf-lsr-isis-srv6-extensions-04 do not allow us

to unambiguously identify a Node-SID for a non-/128

prefix/locator.  For example, the End-SIDs within a /64 locator with the
A-flag set could

either be Ia) a Node-SID  or Ic) neither Node-SID nor Anycast-SID.

I think a reasonable solution would be to remove the restriction

on the N-flag to allow it to be used for non-/128 prefixes/locators.  This

would allow the three possible prefix-SIDs states to be easily represented.



If Interpretation II) is correct, then I think that the current encodings
in

draft-ietf-lsr-isis-srv6-extensions-04 need clarification with respect to

how to interpret a /128 prefix/locator advertisement with N=0, A=0. We

have to decide between interpreting the End-SIDs within the locator

as either Node-SIDs or Anycast-SIDs, since there is no third option.

I think that interpreting the End-SIDs as Anycast-SIDs in the N=0, A=0

case is preferable because it preserves backwards compatibility.


Thanks,

Chris




On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak <ppsenak@cisco.com> wrote:

> Hi Chris,
>
> please see inline (##PP)
>
> On 29/01/2020 17:25, Chris Bowers wrote:
> > I would like to proposed the following text to make section 6 more clear.
> >
> > Thanks,
> > Chris
> >
> > ====================
> >
> >   (existing text)
> >
> >
> > 6.  Advertising Anycast Property
> >
> >     Both prefixes and SRv6 Locators may be configured as anycast and as
> >
> >     such the same value can be advertised by multiple routers.  It is
> >
> >     useful for other routers to know that the advertisement is for an
> >
> >     anycast identifier.
> >
> >     A new flag in "Bit Values for Prefix Attribute Flags Sub-TLV"
> >
> >     registry [RFC7794] is defined to advertise the anycast property:
> >
> >         Bit #: 4 (Suggested - to be assigned by IANA)
> >
> >         Name: Anycast Flag (A-flag)
> >
> >         When the prefix/SRv6 locator is configured as anycast, the A-flag
> >
> >         SHOULD be set. Otherwise, this flag MUST be clear.
> >
> >     The A-flag MUST be preserved when leaked between levels.
> >
> >     The A-flag and the N-flag MUST NOT both be set.
> >
> > ==== start insert new text =======
> >
> >
> > Certain use cases require prefixes/locators that uniquely belong to a
> node.
> >
> > Since prefixes/locators which are not /128 should not have the N bit set,
> >
> > this node local uniqueness is decided based on A bit for non-/128
> prefixes.
>
> ##PP
> above does not seem correct. Above seems to imply that for non-/128
> prefix, A-bit is replacement of N-bit.
>
> A-bit applies to both /128 and non-/128 prefixes equally.
>
> Current draft clearly states what to do when both N a A bits are set.
>
>
>
> >
> >     When a prefix/locator iscategorized as anycast, it does not uniquely
> > belong
> >
> >     to a node and cannot be used for such use cases.  The rules below
> > specify
> >
> >     how to determine whether or not a prefix/locator should be treated
> > as anycast
> >
> >     in various situations.
> >
> >
> >     [RFC7794] contains the following restriction on the interpretation
> of the N-flag.
> >
> >     "If the flag is set and the prefix length is NOT a host prefix
> >
> >      (/32 for IPV4, /128 forIPv6), then the flag MUST be ignored."
> >
> >     The current document does NOT modify this restriction on the
> interpretation of
> >
> >     the N-flag imposed by [RFC7794].
>
> ##PP
> I don't think above text is needed. And I don't think above is
> completely correct, as we define a new case in which the N-bit should be
> ignored (when A-bit is set).
>
>
> >
> >     For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,
> >
> >     if both N-flag and A-flag are set, the receiving router MUST treat
> the
> >
> >     prefix advertisement as anycast.
>
> ##PP
> we have following text in the draft already:
>
> "If both N-flag and A-flag are set in the prefix/SRv6 Locator
>     advertisement, the receiving routers MUST ignore the N-flag."
>
>
>
> >
> >     For a prefix/SRv6 Locator advertisement with a /128 prefix/locator,
> >
> >     if the N-flag and A-flag are NOT set, the receiving routers
> >
> >     MUST treat the prefix advertisement as anycast.
>
> ##PP
> I don't think above statement is correct. Why a node cannot advertise a
> /128 prefix which is not an anycast one and does not have a N-bit set?
>
>
>
> > This rule ensures the
> >
> >     correct interpretation of a prefix advertisement originated by
> >
> >     a router that is not SRv6 capable and originates a legacy
> >
> >     Prefix Attribute Flags Sub-TLV based on [RFC7794] alone.
> >
> >     For a prefix/SRv6 Locator advertisement with a prefix/locator that
> >
> >     is NOT /128, the N-flag must be ignored, so the setting of the
> >
> >     A-flag determines the anycast treatment of the prefix advertisement.
>
> ##PP
> A-flag does that regardless of the length of the prefix.
>
>
> >
> >     The Prefix Attribute Flags Sub-TLV can be carried in the SRv6
> > Locator TLV
> >
> >     as well as the Prefix Reachability TLVs.  When a router originates
> >
> >     both the Prefix Reachability TLV and the SRv6 Locator TLV for a given
> >
> >     prefix, and the router is originating the Prefix Attribute Flags
> Sub-TLV
> >
> >     in one of the TLVs, the router SHOULD advertise identical versions
> of the
> >
> >     Prefix Attribute Flags Sub-TLV in both TLVs.
>
> ##PP
> Above seems a good suggestion. Will add it.
>
> >
> >
> >
> >     If a router receives one Prefix Attribute Flags Sub-TLV in the
> >
> >     Prefix Reachability TLV and another in the SRv6 Locator TLV, the
> router should
> >
> >     use the prefix attribute flags received in the Prefix Reachability
> TLV.
>
> ##PP
> above contradicts what you suggest in the previous paragraph, where you
> suggest we need to advertise with both prefix and locator, and here you
> suggest we ignore what we received in the locator.
>
> Are you talking about the case where the content of the Prefix Attribute
> Flags Sub-TLV is different in prefix vs locator?
> >
> >
> >
> >     If a router receives a Prefix Attribute Flags Sub-TLV in the
> >
> >     Prefix Reachability TLV but not in the SRv6 Locator TLV, the router
> should
> >
> >     use the prefix attribute flags received in the Prefix Reachability
> TLV.
>
> ##PP
> do we really need this? If the originator does the right thing, then we
> don't have the problem. Cross referencing data between different TLVs
> complicates the implementations.
>
>
> >
> >
> >
> >     If a router receives a Prefix Attribute Flags Sub-TLV in the
> >
> >     SRv6 Locator TLV but not in the Prefix Reachability TLV,
> >
> >     the router should use the prefix attribute flags received in the
> SRv6 Locator TLV.
>
> ##PP
> same as above.
>
> thanks,
> Peter
>
> >
> > ==== end insert new text =========
> >
> >     The same prefix/SRv6 Locator can be advertised by multiple routers.
> >
> >     If at least one of them sets the A-Flag in its advertisement, the
> >
> >     prefix/SRv6 Locator SHOULD be considered as anycast.
> >
> >
> >
> > ===================
> >
> >
> > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps <chopps@chopps.org
> > <mailto:chopps@chopps.org>> wrote:
> >
> >     This begins a 2 week WG Last Call, ending after Feb 4, 2020, for
> >     draft-ietf-lsr-isis-srv6-extensions
> >
> >     https://datatracker.ietf.
> .org/doc/draft-ietf-lsr-isis-srv6-extensions/
> >     <
> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/>
> >
> >     Authors please indicate if you aware of any other IPR beyond what is
> >     posted:
> >
> >     https://datatracker.ietf.org/ipr/3796/
> >
> >     Thanks,
> >     Chris & Acee.
> >     _______________________________________________
> >     Lsr mailing list
> >     Lsr@ietf.org <mailto:Lsr@ietf.org>
> >     https://www.ietf.org/mailman/listinfo/lsr
> >
>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Peter and Les,</div><div><br></div><div>
















<pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt"><span style=3D"font-f=
amily:arial,sans-serif">It seems to me that for the Node Flag in RFC7794 an=
d the proposed Anycast Flag <span></span></span></pre><pre style=3D"margin:=
0in 0in 0.0001pt;font-size:10pt"><span style=3D"font-family:arial,sans-seri=
f">in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately concerned w=
ith <span></span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-si=
ze:10pt"><span style=3D"font-family:arial,sans-serif">how to identify IGP-N=
ode Segments and IGP-Anycast Segments, as defined in RFC8402, <span></span>=
</span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt"><span st=
yle=3D"font-family:arial,sans-serif">the Segment Routing Architecture docum=
ent.=C2=A0 <span></span></span></pre><pre style=3D"margin:0in 0in 0.0001pt;=
font-size:10pt"><span style=3D"font-family:arial,sans-serif">=C2=A0</span><=
/pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot=
;Courier New&quot;"><span style=3D"font-family:arial,sans-serif">If this is=
 the case, then the following text from RFC8402 is very relevant.</span><sp=
an></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-f=
amily:&quot;Courier New&quot;">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<span></=
span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family=
:&quot;Courier New&quot;">3.2.=C2=A0 IGP-Node Segment (Node-SID)<span></spa=
n></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&q=
uot;Courier New&quot;"><span>=C2=A0</span></pre><pre style=3D"margin:0in 0i=
n 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=
 An IGP Node-SID MUST NOT be associated with a prefix that is owned by<span=
></span></pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-fam=
ily:&quot;Courier New&quot;">=C2=A0=C2=A0 more than one router within the s=
ame routing domain.<span></span></pre><pre style=3D"margin:0in 0in 0.0001pt=
;font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0</span></p=
re><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;C=
ourier New&quot;">3.3.=C2=A0 IGP-Anycast Segment (Anycast-SID)<span></span>=
</pre><pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quo=
t;Courier New&quot;">=C2=A0=C2=A0 ....<span></span></pre><pre style=3D"marg=
in:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;">=C2=
=A0=C2=A0 An IGP-Anycast segment MUST NOT reference a particular node.<span=
></span></pre>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=C2=A0=C2=A0
....<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<span><=
/span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt"><sp=
an style=3D"font-family:arial,sans-serif"><span style=3D"font-size:10pt">Th=
is
text can be interpreted in two different ways.<span></span></span></span></=
p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt"><span>=C2=A0</span></span></span></p><span style=3D"font-family:arial,=
sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">Interpretation
I) <span></span></span></span></p><span style=3D"font-family:arial,sans-ser=
if">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">A
prefix-SID can have the following three possible states.<span></span></span=
></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">Ia)
Node-SID<span></span></span></span></p><span style=3D"font-family:arial,san=
s-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">Ib)
Anycast-SID <span></span></span></span></p><span style=3D"font-family:arial=
,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">Ic)
neither Node-SID nor Anycast-SID<span></span></span></span></p><span style=
=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt"><span>=C2=A0</span></span></span></p><span style=3D"font-family:arial,=
sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">Interpretation
II) <span></span></span></span></p><span style=3D"font-family:arial,sans-se=
rif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">A
prefix-SID can have the following two possible states.<span></span></span><=
/span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">IIa)
Node-SID<span></span></span></span></p><span style=3D"font-family:arial,san=
s-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">IIb)
Anycast-SID <span></span></span></span></p><span style=3D"font-family:arial=
,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt"><span>=C2=A0</span></span></span></p><span style=3D"font-family:arial,=
sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">If
Interpretation I) is correct, then I think that the current encodings in <s=
pan></span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">draft-ietf-lsr-isis-srv6-extensions-04
do not allow us<span></span></span></span></p><span style=3D"font-family:ar=
ial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">to
unambiguously identify a Node-SID for a non-/128 <span></span></span></span=
></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">prefix/locator.=C2=A0
For example, the End-SIDs within a /64 locator with the A-flag set could<sp=
an></span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">either
be Ia) a Node-SID =C2=A0or Ic) neither Node-SID nor Anycast-SID.<span></spa=
n></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">I
think a reasonable solution would be to remove the restriction<span></span>=
</span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">on
the N-flag to allow it to be used for non-/128 prefixes/locators.=C2=A0 Thi=
s<span></span></span></span></p><span style=3D"font-family:arial,sans-serif=
">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">would
allow the three possible prefix-SIDs states to be easily represented.<span>=
</span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt"><span>=C2=A0</span></span></span></p><span style=3D"font-family:arial,=
sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">If
Interpretation II) is correct, then I think that the current encodings in <=
span></span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">draft-ietf-lsr-isis-srv6-extensions-04
need clarification with respect to <span></span></span></span></p><span sty=
le=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">how
to interpret a /128 prefix/locator advertisement with N=3D0, A=3D0. We<span=
></span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">have
to decide between interpreting the End-SIDs within the locator<span></span>=
</span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">as
either Node-SIDs or Anycast-SIDs, since there is no third option.<span></sp=
an></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">I
think that interpreting the End-SIDs as Anycast-SIDs in the N=3D0, A=3D0<sp=
an></span></span></span></p><span style=3D"font-family:arial,sans-serif">

</span><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11=
pt"><span style=3D"font-family:arial,sans-serif"><span style=3D"font-size:1=
0pt">case
is preferable because it preserves backwards compatibility.</span></span></=
p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><br></p><p class=3D"MsoNormal" st=
yle=3D"margin:0in 0in 0.0001pt;font-size:11pt"><span style=3D"font-family:a=
rial,sans-serif">Thanks,</span></p><p class=3D"MsoNormal" style=3D"margin:0=
in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif">=
<span style=3D"font-family:arial,sans-serif">Chris</span><br></p><p class=
=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:=
&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-family:&=
quot;Courier New&quot;"><span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;"><span>=C2=A0</span></span></p>





</div><div><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak &lt;<a href=3D=
"mailto:ppsenak@cisco.com">ppsenak@cisco.com</a>&gt; wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex">Hi Chris,<br>
<br>
please see inline (##PP)<br>
<br>
On 29/01/2020 17:25, Chris Bowers wrote:<br>
&gt; I would like to proposed the following text to make section 6 more cle=
ar.<br>
&gt; <br>
&gt; Thanks,<br>
&gt; Chris<br>
&gt; <br>
&gt; =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
&gt; <br>
&gt;=C2=A0 =C2=A0(existing text)<br>
&gt; <br>
&gt; <br>
&gt; 6.=C2=A0 Advertising Anycast Property<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 Both prefixes and SRv6 Locators may be configured a=
s anycast and as<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 such the same value can be advertised by multiple r=
outers.=C2=A0 It is<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 useful for other routers to know that the advertise=
ment is for an<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 anycast identifier.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 A new flag in &quot;Bit Values for Prefix Attribute=
 Flags Sub-TLV&quot;<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 registry [RFC7794] is defined to advertise the anyc=
ast property:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Bit #: 4 (Suggested - to be=
 assigned by IANA)<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Name: Anycast Flag (A-flag)=
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 When the prefix/SRv6 locato=
r is configured as anycast, the A-flag<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SHOULD be set. Otherwise, t=
his flag MUST be clear.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 The A-flag MUST be preserved when leaked between le=
vels.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 The A-flag and the N-flag MUST NOT both be set.<br>
&gt; <br>
&gt; =3D=3D=3D=3D start insert new text =3D=3D=3D=3D=3D=3D=3D<br>
&gt; <br>
&gt; <br>
&gt; Certain use cases require prefixes/locators that uniquely belong to a =
node.<br>
&gt; <br>
&gt; Since prefixes/locators which are not /128 should not have the N bit s=
et,<br>
&gt; <br>
&gt; this node local uniqueness is decided based on A bit for non-/128 pref=
ixes.<br>
<br>
##PP<br>
above does not seem correct. Above seems to imply that for non-/128 <br>
prefix, A-bit is replacement of N-bit.<br>
<br>
A-bit applies to both /128 and non-/128 prefixes equally.<br>
<br>
Current draft clearly states what to do when both N a A bits are set.<br>
<br>
<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 When a prefix/locator iscategorized as anycast, it =
does not uniquely <br>
&gt; belong<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 to a node and cannot be used for such use cases.=C2=
=A0 The rules below <br>
&gt; specify<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 how to determine whether or not a prefix/locator sh=
ould be treated <br>
&gt; as anycast<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 in various situations.<br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 [RFC7794] contains the following restriction on the=
 interpretation of the N-flag.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0&quot;If the flag is set and the prefix length is N=
OT a host prefix<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0(/32 for IPV4, /128 forIPv6), then the f=
lag MUST be ignored.&quot;<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 The current document does NOT modify this restricti=
on on the interpretation of<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0the N-flag imposed by [RFC7794].<br>
<br>
##PP<br>
I don&#39;t think above text is needed. And I don&#39;t think above is <br>
completely correct, as we define a new case in which the N-bit should be <b=
r>
ignored (when A-bit is set).<br>
<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0For a prefix/SRv6 Locator advertisement with a=
 /128 prefix/locator,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 if both N-flag and A-flag are set, the receiving ro=
uter MUST treat the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0prefix advertisement as anycast.<br>
<br>
##PP<br>
we have following text in the draft already:<br>
<br>
&quot;If both N-flag and A-flag are set in the prefix/SRv6 Locator<br>
=C2=A0 =C2=A0 advertisement, the receiving routers MUST ignore the N-flag.&=
quot;<br>
<br>
<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 For a prefix/SRv6 Locator advertisement with a /128=
 prefix/locator,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 if the N-flag and A-flag are NOT set, the receiving=
 routers<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0MUST treat the prefix advertisement as anycast=
.=C2=A0 <br>
<br>
##PP<br>
I don&#39;t think above statement is correct. Why a node cannot advertise a=
 <br>
/128 prefix which is not an anycast one and does not have a N-bit set?<br>
<br>
<br>
<br>
&gt; This rule ensures the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0correct interpretation of a prefix advertiseme=
nt originated by<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0a router that is not SRv6 capable and originat=
es a legacy<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Attribute Flags Sub-TLV based on [RFC77=
94] alone.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 For a prefix/SRv6 Locator advertisement with a pref=
ix/locator that<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 is NOT /128, the N-flag must be ignored, so the set=
ting of the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0A-flag determines the anycast treatment of the=
 prefix advertisement.<br>
<br>
##PP<br>
A-flag does that regardless of the length of the prefix.<br>
<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0The Prefix Attribute Flags Sub-TLV can be carr=
ied in the SRv6 <br>
&gt; Locator TLV<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0as well as the Prefix Reachability TLVs.=C2=A0 When=
 a router originates<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0both the Prefix Reachability TLV and the SRv6 =
Locator TLV for a given<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0prefix, and the router is originating the Pref=
ix Attribute Flags Sub-TLV<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 in one of the TLVs, the router SHOULD advertise ide=
ntical versions of the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Attribute Flags Sub-TLV in both TLVs.<b=
r>
<br>
##PP<br>
Above seems a good suggestion. Will add it.<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 If a router receives one Prefix Attribute Flags Sub=
-TLV in the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Reachability TLV and another in the SRv=
6 Locator TLV, the router should<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0use the prefix attribute flags received in the=
 Prefix Reachability TLV.<br>
<br>
##PP<br>
above contradicts what you suggest in the previous paragraph, where you <br=
>
suggest we need to advertise with both prefix and locator, and here you <br=
>
suggest we ignore what we received in the locator.<br>
<br>
Are you talking about the case where the content of the Prefix Attribute <b=
r>
Flags Sub-TLV is different in prefix vs locator?<br>
&gt; <br>
&gt;=C2=A0 =C2=A0<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 If a router receives a Prefix Attribute Flags Sub-T=
LV in the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Reachability TLV but not in the SRv6 Lo=
cator TLV, the router should<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0use the prefix attribute flags received in the=
 Prefix Reachability TLV.<br>
<br>
##PP<br>
do we really need this? If the originator does the right thing, then we <br=
>
don&#39;t have the problem. Cross referencing data between different TLVs <=
br>
complicates the implementations.<br>
<br>
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 If a router receives a Prefix Attribute Flags Sub-T=
LV in the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0=C2=A0SRv6 Locator TLV but not in the Prefix Reachab=
ility TLV,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0the router should use the prefix attribute flags re=
ceived in the SRv6 Locator TLV.<br>
<br>
##PP<br>
same as above.<br>
<br>
thanks,<br>
Peter<br>
<br>
&gt; <br>
&gt; =3D=3D=3D=3D end insert new text =3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 The same prefix/SRv6 Locator can be advertised by m=
ultiple routers.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 If at least one of them sets the A-Flag in its adve=
rtisement, the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0=C2=A0 prefix/SRv6 Locator SHOULD be considered as anycast=
.<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
&gt; <br>
&gt; <br>
&gt; On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps &lt;<a href=3D"mailto:=
chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a> <br>
&gt; &lt;mailto:<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chop=
ps@chopps.org</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0This begins a 2 week WG Last Call, ending after Feb=
 4, 2020, for<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-extensions<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf." rel=3D"norefe=
rrer" target=3D"_blank">https://datatracker.ietf.</a>.org/doc/draft-ietf-ls=
r-isis-srv6-extensions/<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"https://datatracker.ietf.org/doc/dra=
ft-ietf-lsr-isis-srv6-extensions/" rel=3D"noreferrer" target=3D"_blank">htt=
ps://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/</a>&gt;<=
br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Authors please indicate if you aware of any other I=
PR beyond what is<br>
&gt;=C2=A0 =C2=A0 =C2=A0posted:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org/ipr/3796/" =
rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/ipr/3796/=
</a><br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0Chris &amp; Acee.<br>
&gt;=C2=A0 =C2=A0 =C2=A0_______________________________________________<br>
&gt;=C2=A0 =C2=A0 =C2=A0Lsr mailing list<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">L=
sr@ietf.org</a> &lt;mailto:<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank=
">Lsr@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.org/mailman/listinfo/ls=
r" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listin=
fo/lsr</a><br>
&gt; <br>
<br>
</blockquote></div></div>

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions
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