[spring] Benoit Claise's Discuss on draft-ietf-spring-problem-statement-06: (with DISCUSS and COMMENT)
"Benoit Claise" <bclaise@cisco.com> Fri, 22 January 2016 22:11 UTC
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Subject: [spring] Benoit Claise's Discuss on draft-ietf-spring-problem-statement-06: (with DISCUSS and COMMENT)
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Benoit Claise has entered the following ballot position for draft-ietf-spring-problem-statement-06: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-spring-problem-statement/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I would like to discuss this point with the responsible area director during the telechat. No action from the authors is required on this point at this point. The manageability considerations section is a direct cut/paste from a charter (i.e. minimal effort) + two informative references to drafts, not even WG docs. What are we suppose to conclude from this, in terms of manageability requirements? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- - It seems to me that, when speaking of SPRING, people speaks of Segment Routing. The section title 3.3.1.2.2. is "SDN/SR use-case" btw. Why not mention it somewhere in the doc, for this first SPRING document? "SPRING is also known as Segment Routing" - The SPRING architecture SHOULD support traffic engineering, including: To be consistent with the two previous use cases, I guess you want: The SPRING architecture SHOULD support the following traffic engineering, requirements: Otherwise, it seems that TE is an optional use case, which somehow contradicts: In this context, Source Packet Routing in Networking (SPRING) architecture is being defined in order to address the use cases and requirements described in this document. =============================================================== Now updated with Tim Chown's OPS DIR review: Overall this document is quite close to being ready, but I have a few comments below for consideration by the AD / authors. This draft is a problem statement (in the form of a number of use cases) and a set of requirements for Source Packet Routing in Networks (SPRING) or, as it is otherwise known, Segment Routing. It is one of a large number of active documents in the SPRING WG, as listed at https://tools.ietf.org/wg/spring/. These include forays into solution space (e.g. the IPv6 SRH, tagged as a 6man draft) and the SPRING architecture, which can be found at https://tools.ietf.org/html/draft-ietf-spring-segment-routing-07. There is clearly significant interest in the IETF in developing the SR architecture(s) and solutions. The work in SPRING is already quite advanced, and thus one might query the value of extensive effort in nailing down the problem statement and requirements. However, I feel it is proper that the WG should ensure that the basis for their published solutions has been through an appropriate consensus process, esp. should the rationale for certain requirements need to be revisited in the future. In that light, the document feels somewhat ânote formâ, in that requirements are scattered through the discussed use cases, and many are not explained in any detail (presumably as the authors assume certain level knowledge from those in the WG), e.g. what is meant by âshared risk constraintsâ? The terminology could be better explained, for a broader audience, and to reduce any potential ambiguity. The requirements take the form of (depending on how you count them) 32 SHOULDs, and there are, perhaps a little surprisingly, no MUSTs. Are the authors confident that every SHOULD is just that, and that there are no mandatory requirements? I might have queries over certain capabilities (implementations of requirements) in the document, e.g. insertion / removal of IPv6 SRHs, but I think itâs better that this document avoids drifting into discussing potential solution spaces. The Security Considerations section is quite light, though it does contain one SHOULD. I assume more detailed security discussion is to be contained in the solution documents, although I note that the Security Considerations section of the architecture document is also very brief.
- [spring] Benoit Claise's Discuss on draft-ietf-sp… Benoit Claise
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