Re: [spring] I-D Action: draft-ietf-spring-srv6-srh-compression-04.txt

Francois Clad <fclad.ietf@gmail.com> Tue, 04 April 2023 17:03 UTC

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From: Francois Clad <fclad.ietf@gmail.com>
Date: Tue, 04 Apr 2023 19:03:33 +0200
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Subject: Re: [spring] I-D Action: draft-ietf-spring-srv6-srh-compression-04.txt
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Dear WG,



This email is to provide further information on the changes to Sec. 7 and 9
in draft-ietf-spring-srv6-srh-compression-04.



The new text in Sec. 7 describes how a C-SID compliant SR source node may
turn an uncompressed segment list comprising C-SID flavored SIDs into a
compressed segment list. An uncompressed segment list may contain a
combination of NEXT-C-SID and REPLACE-C-SID flavored SIDs, but also any
other SID defined in other documents (e.g., RFC 8986). Compression of
sequences of NEXT-C-SID flavored SIDs and sequences of REPLACE-C-SID
flavored SIDs are described.



The new text in Sec. 9 clarifies that an SR source node requires SID
structure information to perform the compression of a segment list provided
in uncompressed format.



Thanks,

Francois (on behalf of the C-SID co-authors)

On Tue, Apr 4, 2023 at 7:00 PM Francois Clad <fclad.ietf@gmail.com> wrote:

> Dear WG,
>
>
>
> This revision includes significant text changes following the continuous
> and very constructive feedback that we received from many WG participants.
>
>
>
> A summary of the changes is provided below. The authors will also send
> separate emails with further detail on the most important text changes.
>
>
>
> - Following feedback from Gyan and others [1], renamed and expanded Sec. 7
> (was: Efficient SID-list Encoding; now: SR Source Node) and Sec. 9 (Control
> Plane) to describe the method by which an SR source node may leverage the
> SID flavors in this document to encode a compressed SRv6 Segment List in
> the SRH.
>
> - Following offline feedback from WG participants before and during IETF
> 116, expanded Sec. 4 to specify the C-SID flavors applicability to the
> other SR intermediate endpoint behaviors in RFC 8986, namely End.T,
> End.B6.Encaps, End.B6.Encaps.Red, and End.BM. Updated the IANA
> consideration accordingly.
>
> - Following comments from Qiangzhou and other WG participants before
> IETF116, modified REPLACE-C-SID flavor for End and End.X (argument format
> and packet processing when the next C-SID value is 0).
>
> - Added End.DX* and End.DT* for REPLACE-C-SID flavor.
>
> - Following numerous questions from WG participants and implementers,
> added Sec. 6.4 with guidelines for installing C-SID flavored SIDs in FIBs.
>
> - For the same reason, also added the complete pseudocodes for End with
> NEXT-C-SID and End with REPLACE-C-SID in Appendix B.
>
> - Added new implementation reports received by the authors since the last
> revision (Nokia, Arrcus, Marvell, Broadcom, ZTE, H3C, and Ruijie Network).
>
> - NEXT-and-REPLACE-C-SID was removed from this version of the draft due to
> lack of implementation.
>
> - Various editorial fixes and addition of a new contributor.
>
>
>
> The authors would like once again to thank everyone who provided feedback
> or contributed text to this document.
>
>
>
> Thanks,
>
> Francois (on behalf of the C-SID co-authors)
>
>
>
> [1]:
> https://mailarchive.ietf.org/arch/msg/spring/aw56JRv8hPbRZEByguBaVZSNQBs/
>
> On Fri, Mar 31, 2023 at 11:29 PM <internet-drafts@ietf.org> wrote:
>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories. This Internet-Draft is a work item of the Source Packet
>> Routing
>> in Networking (SPRING) WG of the IETF.
>>
>>    Title           : Compressed SRv6 Segment List Encoding in SRH
>>    Authors         : Weiqiang Cheng
>>                      Clarence Filsfils
>>                      Zhenbin Li
>>                      Bruno Decraene
>>                      Francois Clad
>>    Filename        : draft-ietf-spring-srv6-srh-compression-04.txt
>>    Pages           : 45
>>    Date            : 2023-03-31
>>
>> Abstract:
>>    This document specifies new flavors for the SR endpoint behaviors
>>    defined in RFC 8986, which enable a compressed SRv6 Segment-List
>>    encoding in the Segment Routing Header (SRH).
>>
>> The IETF datatracker status page for this Internet-Draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-spring-srv6-srh-compression/
>>
>> There is also an htmlized version available at:
>>
>> https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-srh-compression-04
>>
>> A diff from the previous version is available at:
>>
>> https://author-tools.ietf.org/iddiff?url2=draft-ietf-spring-srv6-srh-compression-04
>>
>> Internet-Drafts are also available by rsync at rsync.ietf.org:
>> :internet-drafts
>>
>>
>> _______________________________________________
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>> https://www.ietf.org/mailman/listinfo/spring
>>
>