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Re: [Gen-art] Genart last call review of draft-ietf-idr-bgp-open-policy-18

Alvaro Retana <aretana.ietf@gmail.com> Tue, 04 January 2022 16:02 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: draft-ietf-idr-bgp-open-policy.all@ietf.org, last-call@ietf.org, idr@ietf.org, gen-art@ietf.org
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Subject: Re: [Gen-art] Genart last call review of draft-ietf-idr-bgp-open-policy-18
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On January 4, 2022 at 10:44:35 AM, Gyan Mishra wrote:

Gyan:


...
> > All capabilities are signaled in the OPEN, so there's no possibility
> > for receiving a Role Capability afterwards.
>
> Gyan> Agreed. The multiple capabilities received is mentioned in the text,
> Gyan> however as it’s signaled in the open how would multiple capabilities
> Gyan> be received. As the role capabilities are sent in the open , how can
> Gyan> the possibility of multiple capabilities occur?

The OPEN can include multiple instances of the same capability.  This
is from rfc5492:

   BGP speakers SHOULD NOT include more than one instance of a
   capability with the same Capability Code, Capability Length, and
   Capability Value.  Note, however, that processing of multiple
   instances of such capability does not require special handling, as
   additional instances do not change the meaning of the announced
   capability; thus, a BGP speaker MUST be prepared to accept such
   multiple instances.

   BGP speakers MAY include more than one instance of a capability (as
   identified by the Capability Code) with non-zero Capability Length
   field, but with different Capability Value and either the same or
   different Capability Length.  Processing of these capability
   instances is specific to the Capability Code and MUST be described in
   the document introducing the new capability.


Alvaro.

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