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

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Thu, 15 December 2022 11:38 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Éric Vyncke via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>
CC: "draft-ietf-idr-bgpls-srv6-ext@ietf.org" <draft-ietf-idr-bgpls-srv6-ext@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "shares@ndzh.com" <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>, "tim@qacafe.com" <tim@qacafe.com>
Thread-Topic: Éric Vyncke's No Objection on draft-ietf-idr-bgpls-srv6-ext-12: (with COMMENT)
Thread-Index: AQHZEHjwt/LsWGhGTkWOS40ArIKAI65u41SA
Date: Thu, 15 Dec 2022 11:38:31 +0000
Message-ID: <0C6CFF46-04F1-4C48-9673-9C767AC7F14E@cisco.com>
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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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Hello Alvaro,

Thanks for educating me on this topic. The rationale makes sense but is not that apparent in the I-D, should the value be considered as opaque in BGP-LS ? I.e., not bearing any semantic for the BGP-LS component (but only to its users ?like a TCP/UDP payload ?)

There is still the question about IS-IS & OSPFv3 having the same set of flags *right now*. Would a divergence be allowed ? (broader scope question than this I-D)

Regards

-éric

On 15/12/2022, 12:32, "Alvaro Retana" <aretana.ietf@gmail.com <mailto:aretana.ietf@gmail.com>> wrote:


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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