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Re: [Idr] AD Review of draft-ietf-idr-bgp-extended-messages-20

Jeffrey Haas <jhaas@pfrc.org> Wed, 08 March 2017 21:35 UTC

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From: Jeffrey Haas <jhaas@pfrc.org>
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Date: Wed, 08 Mar 2017 13:35:01 -0800
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References: <DAEE98CC-8483-499E-B71C-FE4C6FC15A4A@cisco.com> <20170228210627.GB17448@pfrc.org> <3eb4d853-1d44-6250-c70a-26f60eac39e6@cisco.com> <006e01d296db$a7c4c320$f74e4960$@ndzh.com> <CA+b+ERmddHoq+4FmU+Ct3MhH46om8yUt69EoQMyLnzweHF=JgQ@mail.gmail.com> <010101d2974a$8520d060$8f627120$@ndzh.com> <CA+b+ERnejrof2dfvb4YuKpWieLxWOF7mTXkZpaOgJc=y=2V+XA@mail.gmail.com> <018c01d29756$c8b4f610$5a1ee230$@ndzh.com> <CA+b+ER=r6tF3t-THjN_zz5hOLETRV5MjpcoEo+79exeafWBNfQ@mail.gmail.com> <01b301d29758$180458e0$480d0aa0$@ndzh.com> <e2fd2bc1-94fa-66fb-e2f0-668ee5a1f1a1@cisco.com> <CE23F9A0-DC7B-4AC1-A6E4-6BF5A287B71D@nist.gov> <7657b686-0685-9bdf-17ba-e7d618a237aa@cisco.com> <C83C3A72-5059-4345-B0E7-AB7F9FD48E53@nist.gov> <edf306511fd84fbe8bceb4b5801be8ea@XCH-ALN-014.cisco.com> <bc0e6deb-f07b-4234-0c19-85acd162f5b6@cisco.com>
To: Enke Chen <enkechen@cisco.com>
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Cc: idr wg <idr@ietf.org>, Robert Raszuk <robert@raszuk.net>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-extended-messages@ietf.org" <draft-ietf-idr-bgp-extended-messages@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-extended-messages-20
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> On Mar 8, 2017, at 12:13 PM, Enke Chen <enkechen@cisco.com> wrote:
> 
> If one has to send a large OPEN, then it is rejected by the remote speaker, 
> then the session needs to be held down (or for slow retry) until the remote
> speaker is upgraded or the OPEN size reduced locally as you are saying.
> 
> The details need to be specified in a new revision.

This covers my prior comment: The minute you move to extended BGP Open size, you change what wiggle room we've left for version negotiation.

And perhaps that's fine.  I've spent my entire networking life in BGP-4.  A BGP-5 that only has interop with BGP-4 will likely be fine.

That said, you need to say this in the specs.

-- Jeff

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