Re: [Idr] AD Review of draft-ietf-idr-bgp-ls-segment-routing-msd-09

"Ketan Talaulikar (ketant)" <ketant@cisco.com> Mon, 30 March 2020 12:51 UTC

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, "draft-ietf-idr-bgp-ls-segment-routing-msd@ietf.org" <draft-ietf-idr-bgp-ls-segment-routing-msd@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
CC: Susan Hares <shares@ndzh.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>
Thread-Topic: AD Review of draft-ietf-idr-bgp-ls-segment-routing-msd-09
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Date: Mon, 30 Mar 2020 12:51:39 +0000
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-ls-segment-routing-msd-09
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Hi Alvaro,

I see that the point of inclusion of advertisement of MSD in BGP-only networks is the only outstanding point to be addressed from your AD review. You have suggested that the aspects related to advertisement in BGP-only networks are better covered via draft-ketant-idr-bgp-ls-bgp-only-fabric.

As a co-author of both the concerned drafts, I am ok with removing the BGP-only network aspects from the MSD draft and taking it up in the draft that covers aspects of BGP-only networks.

Would like to take inputs of the WG as well on the same and we can plan to move the draft-ketant-idr-bgp-ls-bgp-only-fabric for adoption.

Thanks,
Ketan

-----Original Message-----
From: Alvaro Retana <aretana.ietf@gmail.com> 
Sent: 06 March 2020 22:41
To: draft-ietf-idr-bgp-ls-segment-routing-msd@ietf.org; Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Susan Hares <shares@ndzh.com>om>; idr-chairs@ietf.org; idr@ietf. org <idr@ietf.org>
Subject: Re: AD Review of draft-ietf-idr-bgp-ls-segment-routing-msd-09

On February 28, 2020 at 8:17:42 PM, Jeff Tantsura wrote:


Jeff:

Hi!


Thanks for the updated text -- I looked at -13.

I think that including BGP, in this document, as one of the sources of the MSD is not the right thing to do.  Please see the details below.

That is the only major item remaining.  Please take a look at idnits as there are a couple of unused references left:
https://tools.ietf.org/idnits?url=https://tools.ietf.org/id/draft-ietf-idr-bgp-ls-segment-routing-msd-13.txt


Thanks!

Alvaro.



> On Feb 26, 2020, 2:19 PM -0800, Alvaro Retana , wrote:
...
> > This document, like many other BGP-LS specifications to carry 
> > IGP-derived information is written with that assumption: that the 
> > information will come from the IGPs. However, §2 reads:
> >
> > The BGP-LS speaker may also advertise the MSD information for the 
> > local node and its links when not running any link-state IGP 
> > protocol e.g. when running BGP as the only routing protocol.
> >
> > This case (no IGP) is not fully explained in the text. Borrowing 
> > from the IGP RFCs, two clear pieces of information that are missing are:
> >
> > (1) A definition of what the Node/Link MSDs are. I borrowed from 
> > rfc8476 and made suggestions for §3 and §4 of this document (in-line)