Re: [Idr] Capability Advertisement in draft-ietf-idr-bgp-extended-messages

Randy Bush <randy@psg.com> Thu, 01 August 2019 06:17 UTC

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Date: Wed, 31 Jul 2019 23:17:52 -0700
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From: Randy Bush <randy@psg.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
Cc: Jeffrey Haas <jhaas@pfrc.org>, "Enke Chen (enkechen)" <enkechen@cisco.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-extended-messages@ietf.org" <draft-ietf-idr-bgp-extended-messages@ietf.org>, Susan Hares <shares@ndzh.com>
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Subject: Re: [Idr] Capability Advertisement in draft-ietf-idr-bgp-extended-messages
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> A BGP speaker MUST NOT send the extended messages capability in an
> OPEN message to any BGP speaker if it has received an OPEN message
> without the extended message capability from any BGP speaker.

so, until every router in the bgp internet is extended enabled, no
router may use extended.

i suspect you may not want this consequence.

randy