On Oct 15, 2015, at 1:03 AM, Spencer Dawkins <[email protected]> 
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
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