Re: [Lsr] Mirja Kühlewind's No Objection on draft-ietf-isis-segment-routing-extensions-24: (with COMMENT)
Mirja Kuehlewind <ietf@kuehlewind.net> Tue, 14 May 2019 16:34 UTC
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From: Mirja Kuehlewind <ietf@kuehlewind.net>
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Date: Tue, 14 May 2019 18:34:36 +0200
Cc: The IESG <iesg@ietf.org>, "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>, Christian Hopps <chopps@chopps.org>, Uma Chunduri <uma.chunduri@huawei.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Subject: Re: [Lsr] Mirja Kühlewind's No Objection on draft-ietf-isis-segment-routing-extensions-24: (with COMMENT)
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Hi Les, Please see inline. > On 14. May 2019, at 18:12, Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote: > > Mirja - > > Thanx for the review. > Responses inline. > >> -----Original Message----- >> From: Mirja Kühlewind via Datatracker <noreply@ietf.org> >> Sent: Tuesday, May 14, 2019 4:58 AM >> To: The IESG <iesg@ietf.org> >> Cc: draft-ietf-isis-segment-routing-extensions@ietf.org; Christian Hopps >> <chopps@chopps.org>; Uma Chunduri <uma.chunduri@huawei.com>; >> aretana.ietf@gmail.com; lsr-chairs@ietf.org; uma.chunduri@huawei.com; >> lsr@ietf.org >> Subject: Mirja Kühlewind's No Objection on draft-ietf-isis-segment-routing- >> extensions-24: (with COMMENT) >> >> Mirja Kühlewind has entered the following ballot position for >> draft-ietf-isis-segment-routing-extensions-24: No Objection >> >> 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-isis-segment-routing-extensions/ >> >> >> >> ---------------------------------------------------------------------- >> COMMENT: >> ---------------------------------------------------------------------- >> >> A few comments/questions: >> >> 1) For both the Prefix Segment Identifier and the Adjacency Segment >> Identifier >> sub-TLV it is not fully clear to me what the value field is used for when the >> V-Flag is set. Can you further elaborate this in the draft or provide a >> respective pointer? >> > [Les:] https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-24#section-2.1.1.1 defines this. I was assuming that it is defined somewhere. Maybe putting a ref in the doc that points at this draft could be good. > >> 2) The F-Flag in Adjacency Segment Identifier sub-TLV and SID/Label Binding >> TLV >> is only one bit. I'm not expecting a new version of IP any time soon, >> however, >> maybe completely different address families could be useful as well. Not >> sure >> if only 1 bit is future-proof...? >> > [Les:] This is a very forward looking comment. :-) > > Seriously, if a new version of IP is invented there will be a LOT of protocol work required to support it. It is also not a given that MPLS would be supported for such a new IP version - so it isn't at all a given that these extensions (however modified) would apply. I’m actually not sure because many protocols that need to cover IPv4 and IPv6 have already a longer field (or alternative would need a new extension for any new protocol anyway)… > Also, changing the encoding now would be problematic for existing deployments (of which there are many) and I think we would have a hard time defining what an extensible encoding would be. I was assuming this answer already, so… > > I like to think we can deal with this when the time comes. > Sound OK? … I guess it’s fine. > >> 3) Would it make sense to also discuss any risk of leaking information (e.g. >> about the network topology) in the security consideration section? >> > > [Les:] Prefix leaking is an established practice in IS-IS dating back to RFC 1195, extended by RFC 5302, and not modified by this document. > Note that the Security section already discusses the advertisement of information used to program the MPLS forwarding plane - which covers the additional sub-TLV information which would accompany leaked prefixes. Adding a few sentences and pointers to the RFC you just listed could still be good! Mirja > > Les >
- [Lsr] Mirja Kühlewind's No Objection on draft-iet… Mirja Kühlewind via Datatracker
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Les Ginsberg (ginsberg)
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Mirja Kuehlewind
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Les Ginsberg (ginsberg)
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Les Ginsberg (ginsberg)
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Les Ginsberg (ginsberg)
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra
- Re: [Lsr] Mirja Kühlewind's No Objection on draft… Gyan Mishra