Re: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested

Jeffrey Haas <jhaas@pfrc.org> Wed, 28 April 2021 13:19 UTC

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Date: Wed, 28 Apr 2021 09:42:22 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: "UTTARO, JAMES" <ju1738@att.com>
Cc: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "idr@ietf. org" <idr@ietf.org>, Ben Cox <ben=40benjojo.co.uk@dmarc.ietf.org>, Robert Raszuk <robert@raszuk.net>
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Subject: Re: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested
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Jim,

On Tue, Apr 27, 2021 at 03:15:07PM +0000, UTTARO, JAMES wrote:
> > From: Idr <idr-bounces@ietf.org> On Behalf Of Jeffrey Haas
> > This isn't a strong argument that Graceful Restart proecures may not still
> > be appropriate.  After all, we have some portion of a rib that may be
> > correct.  However, there's perhaps an argument that that it might be less in
> > sync in some circumstances than others.
>
> [Jim U>] Certain BGP FOUs i.e Kompella, BGP LU are less dynamic implying that the specification of state is relatively static. For certain FOUs I accept less than perfection in the interest of maintaining a service or network. This discussion would benefit from recognizing the differences. 

A valid point.  And perhaps a related warning about the "all eggs in one
basket" problem of everything on the same session.  Structural separation of
address families is one way to avoid that problem.

This is the usual point where the conversation starts swinging towards the
BGP multisession document. 

And it's worth noting that an implementation may decide that during Graceful
Restart that it doesn't want to preserve the incoming RIB and can do so on a
per-family basis.

-- Jeff