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

Jeffrey Haas <jhaas@pfrc.org> Wed, 28 April 2021 13:23 UTC

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Date: Wed, 28 Apr 2021 09:46:45 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
Cc: Robert Raszuk <robert@raszuk.net>, "idr@ietf. org" <idr@ietf.org>, Ben Cox <ben=40benjojo.co.uk@dmarc.ietf.org>
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Subject: Re: [Idr] draft-spaghetti-idr-bgp-sendholdtimer - Feedback requested
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Jakob,

On Wed, Apr 28, 2021 at 12:15:52AM +0000, Jakob Heitz (jheitz) wrote:
> 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.

One of the things I think is valuable about the discussion is it likely
belongs in a document for users of TCP for routing - and perhaps other
applications.  BGP tends to just be the most visible "victim" of these sort
of problems:
- The sessions are long-lived.
- The amount of data is modest, but the timeliness requirements are
  important.
- The routing system is negatively impacted when this sort of congestion
  occurs.

I don't think we have strong consensus for what BGP should do when these
problems occur, but we're starting to build quite the attack tree for the
scenario.

-- Jeff