Re: [GROW] Spencer Dawkins' No Objection on draft-ietf-grow-bmp-15: (with COMMENT)

"John G. Scudder" <jgs@juniper.net> Wed, 04 November 2015 05:44 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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To: Spencer Dawkins <spencerdawkins.ietf@gmail.com>
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Subject: Re: [GROW] Spencer Dawkins' No Objection on draft-ietf-grow-bmp-15: (with COMMENT)
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On Oct 15, 2015, at 1:03 AM, Spencer Dawkins <spencerdawkins.ietf@gmail.com> wrote:
> I found myself wondering when you can start route mirroring,

I think the answer is "pretty much any time" following the Initiation and Peer Up. It's true this isn't written down anywhere. I propose adding this to the end of S 4.7:

   A Route Mirroring message may be sent any time it would be legal to
   send a Route Monitoring message.

> and whether
> there was any guidance about what to do when a BGP speaker runs out of
> buffers so that route mirroring is no longer complete.

Yes, there is. You send one of these:

   o  Type = 1: Information.  A two-byte code that provides information
      about the mirrored message or message stream.  Defined codes are:
...
      *  Code = 1: Messages Lost.  One or more messages may have been
         lost.  This could occur, for example, if an implementation runs
         out of available buffer space to queue mirroring messages.

Thanks,

--John