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Re: [Idr] Mirja Kühlewind's No Objection on draft-ietf-idr-bgp-extended-messages-33: (with COMMENT)

Alvaro Retana <aretana.ietf@gmail.com> Tue, 30 July 2019 19:00 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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Date: Tue, 30 Jul 2019 15:00:32 -0400
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To: Susan Hares <shares@ndzh.com>, Mirja Kühlewind <ietf@kuehlewind.net>, The IESG <iesg@ietf.org>
Cc: idr-chairs@ietf.org, draft-ietf-idr-bgp-extended-messages@ietf.org, idr@ietf.org
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Subject: Re: [Idr] Mirja Kühlewind's No Objection on draft-ietf-idr-bgp-extended-messages-33: (with COMMENT)
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On July 30, 2019 at 12:22:13 PM, Susan Hares (shares@ndzh.com) wrote:

Sue:

Hi!

On #2, the Discussion from the WG (over long period of time) suggested that
this exact statement was not clearly stated in RFC4271.


This is the text that Mirja highlighted:

   If a BGP message with a Length greater than 4,096 octets is received
   by a BGP listener who has not advertised the Extended Message
   Capability, the listener MUST treat this as a malformed message, and
   MUST generate a NOTIFICATION with the Error Subcode set to Bad
   Message Length (see [RFC4271] Sec 6.1).

First of all, if a BGP router doesn't support Extended Messages it means it
doesn't support this document...so we can't Normatively tell them what to
do.

rfc4271/§6.1 (Message Header Error Handling) specifies what to do if, among
other things, the length is greater than 4096...so that would be what the
speaker who doesn't support this document would do.

NEW>
   If a BGP message with a Length greater than 4,096 octets is received
   by a BGP listener who has not advertised the Extended Message
   Capability, the listener will generate a NOTIFICATION with the Error
   Subcode set to Bad Message Length ([RFC4271], Section 6.1).


Thanks!

Alvaro.

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