Re: [spring] https://datatracker.ietf.org/doc/html/draft-filsfilscheng-spring-srv6-srh-compression-02#section-4.1.1

[Gyan Mishra <[e-mail]>]

Sorry I missed that.

Thank you!!

On Fri, Sep 24, 2021 at 11:05 AM James Guichard <
[e-mail]> wrote:

> Hi Gyan,
>
>
>
> [Chair hat off …]
>
>
>
> You asked where in the CSID document it states “CSID draft recommended
> NEXT-C-SID use for 16-bit C-SIDs, and REPLACE-C-SID use for 32-bit C-SIDs. “
>
>
>
> Please see:
>
>
>
> *6
> <https://datatracker.ietf.org/doc/html/draft-filsfilscheng-spring-srv6-srh-compression-02#section-6>.
> C-SID and Block Length*
>
>
>
> *6.1
> <https://datatracker.ietf.org/doc/html/draft-filsfilscheng-spring-srv6-srh-compression-02#section-6.1>.
> C-SID Length*
>
>
>
>    The NEXT-C-SID flavor supports both 16- and 32-bit C-SID lengths.  A
>
>    C-SID length of 16-bit is recommended.
>
>
>
>    The REPLACE-C-SID flavor supports both 16- and 32-bit C-SID lengths.
>
>    A C-SID length of 32-bit is recommended.
>
>
>
> Jim
>
>
>
>
>
> *From:* Gyan Mishra <[e-mail]>
> *Sent:* Friday, September 24, 2021 10:53 AM
> *To:* Darren Dukes (ddukes) <[e-mail]>
> *Cc:* SPRING WG <[e-mail]>;
> [e-mail];
> [e-mail]
> *Subject:* Re: [spring]
> https://datatracker.ietf.org/doc/html/draft-filsfilscheng-spring-srv6-srh-compression-02#section-4.1.1
>
>
>
> Thank you Darren!
>
>
>
> Few comments.
>
>
>
> I do see many early allocation for C-SID for various endpoint behaviors.
>
>
>
> https://www.iana.org/assignments/segment-routing/segment-routing.xhtml
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iana.org%2Fassignments%2Fsegment-routing%2Fsegment-routing.xhtml&data=04%7C01%7Cjames.n.guichard%40futurewei.com%7C02af79e38912473c50e108d97f6b41be%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637680920918409649%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=eWX%2Bhuyl9obuOYLLxQs%2FoH4t7lllEfacUp5C0c5QgNg%3D&reserved=0>
>
>
>
> I was trying to find out where in the CSID draft that is stated.  Please
> provide the section.
>
>
>
> “CSID draft recommended NEXT-C-SID use for 16-bit C-SIDs, and
> REPLACE-C-SID use for 32-bit C-SIDs. “
>
>
>
> Just based on the CSID draft SRv6 forwarding plane flavors, SID
> formatting,  the NEXT-C-SID used a 16-bit combined NF -Locator/Function
> uSID variant where the REPLACE-C-SID uses a 32-bit combined
> NF-Locator/Function.
>
>
>
> I did not see explicit verbiage as to one flavor or the other for 16 or 32
> bit SID.
>
>
>
> I believe this  information is important to be included in the analysis
> draft as well.
>
>
>
> Section 6 talks about CSID length, Block length and GIB/LIB usage but does
> not specify explicitly what you are stating.
>
>
>
> As the WG has clearly stated that they would like a single solution,
> however CSID is inclusive of 2 SRv6 forwarding compression solutions not
> one from the two drafts - uSID & G-SID.
>
>
>
> So that would have to be hashed out by the WG taking into account the
>  interoperability issue that is the key point of contention to having
> multiple solutions from an operators perspective.
>
>
>
> Kind Regards
>
>
>
> Gyan
>
>
>
>
>
>
>
> On Fri, Sep 24, 2021 at 10:10 AM Darren Dukes (ddukes) <[e-mail]>
> wrote:
>
> Hi Gyan, as a DT member, I can answer your analysis draft question.
>
> Consistent with the requirement document, proposals were analyzed with
> 16-bit and 32-bit SID lengths, though several supported additional options.
>
> The CSID draft recommended NEXT-C-SID use for 16-bit C-SIDs, and
> REPLACE-C-SID use for 32-bit C-SIDs. The design team followed this
> recommendation in its analysis, though the CSID draft notes all flavors
> support both 16-bit and 32-bit C-SID length.
>
> Darren
>
>
>
>
>
> On 2021-09-19, 3:34 PM, "spring" <[e-mail]> wrote:
>
>
>
> Dear Authors
>
>
>
> After having a few discussions on threads related to the SRv6 compression
> analysis draft results, as well as WG coming to consensus on a single SRv6
> compression solution, a few critical questions have come up related to
> C-SID draft that requires clarification by the authors.
>
>
>
> The C-SID draft has 3 compression solutions below and is a combination of
> the two drafts below which introduces 2 of the 3 compression solutions with
> the  C-SID draft introduction of yet a 3rd compression solution.
>
>
>
> Which of the 3 C-SID draft compression solutions was included as part of
> the DT analysis draft results and conclusion?
>
>
>
> This is a critical question that needs to be answered for clarification on
> the C-SID draft solution.
>
>
>
> As the WG has consensus on a single solution we need to have clarification
> from the authors which of the 3 compression solutions was included in the
> analysis.
>
>
>
> The three solutions are very different and all would yield different
> analysis results.
>
>
>
> I understand the authors have called the each solution a endpoint flavor
> which I see from the IANA codepoint allocations, however each flavor is a
> different solution.
>
>
>
> https://www.iana.org/assignments/segment-routing/segment-routing.xhtml
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iana.org%2Fassignments%2Fsegment-routing%2Fsegment-routing.xhtml&data=04%7C01%7Cjames.n.guichard%40futurewei.com%7C02af79e38912473c50e108d97f6b41be%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637680920918419645%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=QYAGkTnNs0Bfb768auk2U%2BzykfOw%2BPmF609Dj6gwlIQ%3D&reserved=0>
>
>
>
> So the WG as stated would like a single solution so now we need feedback
> from the authors which of the three solutions or endpoint flavors was part
> of the DT analysis draft that the authors would like to put forward as the
> single compression solution.
>
>
>
> C-SID is a combination of the two drafts below:
>
>
>
> Combination of the two drafts below:
>
>
>
> G-SID - Generalized SID “REPLACE-C-SID”
>
>
> https://datatracker.ietf.org/doc/html/draft-cl-spring-generalized-srv6-for-cmpr-03
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-cl-spring-generalized-srv6-for-cmpr-03&data=04%7C01%7Cjames.n.guichard%40futurewei.com%7C02af79e38912473c50e108d97f6b41be%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637680920918419645%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=xQXCNLDdSC4XXjdZXrLM05BxJ11M4cSZPtI2pSGURAA%3D&reserved=0>
>
>
>
> SRv6 uSID micro-segment “ NEXT-C-SID”
>
>
> https://datatracker.ietf.org/doc/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-10
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-filsfils-spring-net-pgm-extension-srv6-usid-10&data=04%7C01%7Cjames.n.guichard%40futurewei.com%7C02af79e38912473c50e108d97f6b41be%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637680920918429635%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=6CispEy1z1jsNI5LzPsbMA3aIlsImAZ4dgWZFrIneYk%3D&reserved=0>
>
>
>
> Kind Regards
>
>
>
> Gyan
>
> --
>
>
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>
> *Gyan Mishra*
>
> *Network Solutions Architect *
>
> *Email [e-mail] <[e-mail]>*
>
> *M 301 502-1347*
>
>
>
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> *Gyan Mishra*
>
> *Network Solutions Architect *
>
> *Email [e-mail] <[e-mail]>*
>
> *M 301 502-1347*
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*Network Solutions A**rchitect *

*Email [e-mail] <[e-mail]>*



*M 301 502-1347*