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Re: [Idr] Robert Wilton's Discuss on draft-ietf-idr-eag-distribution-16: (with DISCUSS)

"Rob Wilton (rwilton)" <rwilton@cisco.com> Tue, 18 May 2021 14:18 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Robert Wilton via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>
CC: "draft-ietf-idr-eag-distribution@ietf.org" <draft-ietf-idr-eag-distribution@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, Susan Hares <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: Robert Wilton's Discuss on draft-ietf-idr-eag-distribution-16: (with DISCUSS)
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Date: Tue, 18 May 2021 14:17:54 +0000
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Subject: Re: [Idr] Robert Wilton's Discuss on draft-ietf-idr-eag-distribution-16: (with DISCUSS)
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Hi Alvaro,


> -----Original Message-----
> From: Alvaro Retana <aretana.ietf@gmail.com>
> Sent: 18 May 2021 14:53
> To: Robert Wilton via Datatracker <noreply@ietf.org>; The IESG
> <iesg@ietf.org>; Rob Wilton (rwilton) <rwilton@cisco.com>
> Cc: draft-ietf-idr-eag-distribution@ietf.org; idr-chairs@ietf.org;
> Susan Hares <shares@ndzh.com>; idr@ietf.org
> Subject: Re: Robert Wilton's Discuss on draft-ietf-idr-eag-
> distribution-16: (with DISCUSS)
> 
> On May 18, 2021 at 6:16:19 AM, Robert Wilton wrote:
> 
> 
> Rob:
> 
> Hi!
> 
> 
> ...
> > I think that it would be helpful for this document to explicitly
> state how
> > this attribute behaves in conjunction with the existing
> Administrative Group
> > (color) TLV (1088). E.g., is the expectation that if this attribute
> is
> > published then the 1088 attribute would also always be published
> (with the
> > same first 32 bits)? Or is the expectation that this attribute can be
> > published without the 1088 attribute being published at all?
> >
> > Similarly, if a client receives both attributes there are there any
> > expectations to how it handles those, i.e., should it always use the
> new
> > attribute in preference? Or otherwise, what should it do if the
> values were
> > inconsistent between the two attributes?
> 
> This document defines an extension to BGP-LS (rfc7752), which leaves
> out of scope how the information is used by the client ("consumer" in
> rfc7752).  IOW, specifying the behavior is not in scope of this
> document.
[RW] 

My concern isn't really about how this information is used, but how the new version of this attribute is expected to interplay with the existing version of this attribute that only carries a 32-bit value.  I.e., can the client rely on the old 1088 attribute being published even in the case that the attribute field is longer than 32 bits?

Even if the answer is that the server can do whatever it likes, is it not better to explicitly state that than leave the reader wondering?

Thanks,
Rob


> 
> Thanks!
> 
> Alvaro.

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