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

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Wed, 28 April 2021 00:16 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>
CC: Robert Raszuk <robert@raszuk.net>, "idr@ietf. org" <idr@ietf.org>, Ben Cox <ben=40benjojo.co.uk@dmarc.ietf.org>
Thread-Topic: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested
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Date: Wed, 28 Apr 2021 00:15:52 +0000
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References: <CAL=9YSVy+mvxvAv+maxkUSzPbe0bfnUy-XJJTtcVhi3S3bm=WQ@mail.gmail.com> <20210423212348.GB19004@pfrc.org> <CAOj+MMGH+y-gxSLaakknWSPFLEk9ikkUU1fa=3H0FjkokAbg3w@mail.gmail.com> <20210424004838.GC19004@pfrc.org> <CAOj+MMH5yzpPZjdUcfXV4cxCORqCsQY4X+niBjnwxjPfN-tsJA@mail.gmail.com> <BYAPR11MB3207E4A0BDC3367E21886C55C0439@BYAPR11MB3207.namprd11.prod.outlook.com> <20210427124724.GA21146@pfrc.org>
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Subject: Re: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested
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Jeff,

Your point, if I get it, is that if the peer is stuck receiving my
routes, it's likely stuck on receiving other routes too.

My response: It's a risk, but let the other routers take care of that
by resetting their sessions too.

I think the draft should have a discussion section to list all the
points we made in this thread to give operators a good base on which
to decide their own configurations.

I think the default should be a long timer and to retain the routes
when resetting the session. However, this choice should be configurable.


Regards,
Jakob.

-----Original Message-----
From: Jeffrey Haas <jhaas@pfrc.org> 
Sent: Tuesday, April 27, 2021 5:47 AM
To: Jakob Heitz (jheitz) <jheitz@cisco.com>
Cc: Robert Raszuk <robert@raszuk.net>et>; idr@ietf. org <idr@ietf.org>rg>; Ben Cox <ben=40benjojo.co.uk@dmarc.ietf.org>
Subject: Re: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested

On Sun, Apr 25, 2021 at 06:01:06AM +0000, Jakob Heitz (jheitz) wrote:
> A long time of TCP zero window does not indicate a data plane
> problem, nor a problem with routes received from the stuck peer.
> The blockage is in one direction only. The local speaker is unable
> to end routes to the stuck peer, but is able to receive routes
> from the stuck peer just fine.

A further bit of thinking for the problem:

While it's true that the blockage is one way, it's not necessarily
guaranteed that you're getting routes from the peer.  This is true even if
you might be receiving keepalives.

The example case would be a BGP that had a decoupled keepalive mechanism for
its FSM.  The implementation may not be draining its incoming rib-in from a
socket, and similarly may be stuck in publishing its rib-out.

Of course, there's no way to tell if this is happening.

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.

-- Jeff