Re: [Idr] [Re: Idr] I-D Action: draft-ietf-idr-bgp-extended-messages-31.txt

"Enke Chen (enkechen)" <enkechen@cisco.com> Tue, 02 July 2019 03:39 UTC

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From: "Enke Chen (enkechen)" <enkechen@cisco.com>
To: Randy Bush <randy@psg.com>
CC: "idr@ietf.org" <idr@ietf.org>, "Enke Chen (enkechen)" <enkechen@cisco.com>
Thread-Topic: [Idr] [Re: Idr] I-D Action: draft-ietf-idr-bgp-extended-messages-31.txt
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Date: Tue, 2 Jul 2019 03:39:09 +0000
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Subject: Re: [Idr] [Re: Idr] I-D Action: draft-ietf-idr-bgp-extended-messages-31.txt
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Hi, Randy:

Were there any specific issues for the capability to be unidirectional?   It's not
clear to me how requiring the capability to be bidirectional would help.

Thanks.  -- Enke

On 7/1/19, 6:05 PM, "Randy Bush" <randy@psg.com> wrote:

    > Apologies for being late in the review cycle of this document.  But I
    > have a basic question about the BGP capability defined in Sect 3:
    > 
    > --
    >    By advertising the BGP Extended Message Capability to a peer, a BGP
    >    speaker conveys that it is able to send, receive, and properly
    >    handle, see Section 4, BGP Extended Messages.
    > --
    > 
    > The text “… to send” does not seem to be necessary, and the spec would
    > be simpler and cleaner without it.
    > 
    > IMO the capability should be about “receiving” only. As long as a BGP
    > speaker is able and willing to receive large messages (by advertising
    > the capability), its neighbor would be allowed to send such messages
    > to the speaker. It really does not matter whether the speaker is able
    > / willing / need to send any large messages to its neighbors.  (Of
    > course certain “Operational” considerations still apply, especially
    > for IBGP, as discussed in the document.)
    > 
    > What do folks think?
    
    we weny around this at least twice during the wg process.  there was a
    dislike of the possibility of extended messages being unidirectional,
    error reporting, etc.
    
    but i have no dog in this fight
    
    randy