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Re: [Idr] WG adoption call for draft-abraitis-bgp-version-capability-08, to end September 25

John Scudder <jgs@juniper.net> Thu, 12 January 2023 17:40 UTC

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From: John Scudder <jgs@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: Jeffrey Haas <jhaas@pfrc.org>, Donatas Abraitis <donatas.abraitis@hostinger.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, Alvaro Retana <aretana.ietf@gmail.com>, Bruno Decraene <bruno.decraene@orange.com>, IDR List <idr@ietf.org>
Thread-Topic: [Idr] WG adoption call for draft-abraitis-bgp-version-capability-08, to end September 25
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Subject: Re: [Idr] WG adoption call for draft-abraitis-bgp-version-capability-08, to end September 25
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> On Jan 11, 2023, at 11:07 AM, Robert Raszuk <robert@raszuk.net> wrote:
> 
> >  I think what you're intending to type is encoding the version capability in a new optional parameter 
> > different than a capability optional parameter.
> 
> Yes and I am not insisting on the choice of any specific encoding. 

For those who don’t remember the history you may want to take a look at RFC 4271 Section 6.2:

   If one of the Optional Parameters in the OPEN message is not
   recognized, then the Error Subcode MUST be set to Unsupported
   Optional Parameters.

That is, any RFC 4271 compliant implementation that receives an OPEN Optional Parameter that it doesn’t recognize will reset the session. This is exactly the reason Capabilities were introduced — because we realized that the way Optional Parameters were defined doesn’t lend itself to the introduction of new parameters. 

AFAICT it would be a nonstarter to use a new Optional Parameter for the application under discussion.

—John

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