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Re: [Sidrops] Format of ASPA RTR PDU

"Dale W. Carder" <dwcarder@es.net> Wed, 20 December 2023 19:16 UTC

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Date: Wed, 20 Dec 2023 13:15:56 -0600
From: "Dale W. Carder" <dwcarder@es.net>
To: Claudio Jeker <cjeker@diehard.n-r-g.com>
Cc: gengnan <gengnan=40huawei.com@dmarc.ietf.org>, sidrops <sidrops@ietf.org>
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Subject: Re: [Sidrops] Format of ASPA RTR PDU
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Thus spake Claudio Jeker (cjeker@diehard.n-r-g.com) on Tue, Dec 19, 2023 at 11:05:39AM +0100:
> On Tue, Dec 19, 2023 at 03:07:25AM +0000, gengnan wrote:
> Critical Issues for draft-ietf-sidrops-8210bis:

<snip>
 
> - Section  7. Protocol Version Negotiation
>    While implementing this in stayrtr and openbgpd I realized that the
>    currently proposed version negotiation is brittle and prone to unwanted
>    downgrades.

Could you elaborate on this?  Do you perceive the brittleness as
occurring more in the implementation of the cache or on the router?  

As I read 8210bis, the router is in control of this process, starting 
with the highest version number it supports, working its way down 
triggered by the error code or a lower version # response from the 
cache.

Dale

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