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Re: [Lsr] Barry Leiba's No Objection on draft-ietf-isis-segment-routing-extensions-24: (with COMMENT)

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Thu, 16 May 2019 05:01 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Barry Leiba <barryleiba@computer.org>, The IESG <iesg@ietf.org>
CC: "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>
Thread-Topic: Barry Leiba's No Objection on draft-ietf-isis-segment-routing-extensions-24: (with COMMENT)
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Date: Thu, 16 May 2019 05:01:28 +0000
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Subject: Re: [Lsr] Barry Leiba's No Objection on draft-ietf-isis-segment-routing-extensions-24: (with COMMENT)
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Barry -

Thanx for the review.
Response inline.

> -----Original Message-----
> From: Barry Leiba via Datatracker <noreply@ietf.org>
> Sent: Wednesday, May 15, 2019 9:30 PM
> 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; lsr@ietf.org
> Subject: Barry Leiba's No Objection on draft-ietf-isis-segment-routing-
> extensions-24: (with COMMENT)
> 
> Barry Leiba 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.)
> 
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> 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:
> ----------------------------------------------------------------------
> 
> — Section 4.4 —
> As you’re defining a new Expert Review registry, it would help to include
> some
> brief guidance for the designated expert (see RFC 8126).
> 

[Les:] In this case this is easier said than done. Exactly what other functions might be appropriately supported by sub-TLVs in these TLVs is unclear at this time. Earlier versions of the draft had a number of Explicit Routable Objects (ERO) - but over the course of the development of the SR technology these proved to be not implemented by anyone so they were removed. What a future use case might be cannot be predicted. Folks who propose extensions will have to define why these TLVs are the appropriate place for a new sub-TLV and the WG and Designated Experts will have to use their good judgment to evaluate the request.

So other than some vague words I really don't know what to say. WE could say "follow the guidelines in RFC 8126" - but that seems implicit.

   Les

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