[quagga-dev 10540] Re: bgp and Multiprotocol Extension Capability
chris.hall.list at highwayman.com
Wed May 22 18:18:36 BST 2013
Pradosh Mohapatra wrote (on Sun 19-May-2013 at 16:09 +0100):
> From RFC4724 (and this seems to imply what you are asking for):
> Address Family Identifier (AFI), Subsequent Address Family
> Identifier (SAFI):
> The AFI and SAFI, taken in combination, indicate that Graceful
> Restart is supported for routes that are advertised with the
> same AFI and SAFI. Routes may be explicitly associated with a
> particular AFI and SAFI using the encoding of [BGP-MP] or
> implicitly associated with <AFI=IPv4, SAFI=Unicast> if using
> the encoding of [BGP-4].
I dunno. The last sentence has all the appearance of a statement of
the blindingly obvious.
I guess it is meant to mean that you can advertise Graceful Restart
for IPv4/Unicast without supporting [BGP-MP]... but (even) in that
case, IPv4/Unicast needs to be included explicitly in the list,
despite the fact that you: a) don't understand any other afi/safi; b)
don't issue any MP-Ext; c) use the encoding of [BGP-4].
If it is meant to mean anything else, then I fear it has gone *way*
over my head :-(
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