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Re: [Idr] Éric Vyncke's No Objection on draft-ietf-idr-bgpls-srv6-ext-12: (with COMMENT)

Alvaro Retana <aretana.ietf@gmail.com> Thu, 15 December 2022 11:32 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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Date: Thu, 15 Dec 2022 05:32:30 -0600
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To: Éric Vyncke via Datatracker <noreply@ietf.org>, Éric Vyncke <evyncke@cisco.com>, The IESG <iesg@ietf.org>
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Subject: Re: [Idr] Éric Vyncke's No Objection on draft-ietf-idr-bgpls-srv6-ext-12: (with COMMENT)
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On December 15, 2022 at 4:19:21 AM, Éric Vyncke wrote:


Eric:

Hi!  thanks fo the review!

...
> ### Section 3.1
>
> I second John's point on the lack of specification for the Flag field. This
> document does not specify how to interpret the values. It happens that the
> IS-IS and OSPFv3 specify a 16-bit value with currently the same semantic
> associated to the 16-bit but I fear that this is quite dangerous to have the
> *same* field specified in several documents. Strongly suggest creating a IANA
> registry for this 16-bit field shared by (at least) 3 IETF drafts.
>
> The same comment applies to many other values in the document.

BGP-LS is a transport for information originated by OSPF/IS-IS.  The
BGP-LS Consumer is the user of this information, and the only node
that would interpret it.  rfc7752 (and more clearly in rfc7752bis)
leave the validation and use of the contents up to the Consumer, which
is not a BGP speaker, so it is out of scope.

The BGP-LS UPDATES include an indication of the origin protocol
(OSPF/IS-IS) so the Consumer can interpret the fields accordingly.

That is how all the BGP-LS extensions have been specified to date.


Alvaro.

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