advertising BGP subnet from two ASs--one advertising the CIDR

From: Jeff Nelson (jnelson@rackspace.com)
Date: Fri Aug 27 2004 - 12:43:56 GMT-3


Say you're advertising a /20 from one AS. You want to take a /24 from
that and advertise it from another AS--I believe this is an "anycast"
solution for BGP created redundancy. When that /24 is created on the
other AS, it does not advertise it to its EBGP peer. Do I have this all
wrong? It would seem that since the router is receiving a /20 from the
other AS via EBGP, it won't advertise a subset of that to the same
neighbor. I though you could as long as it wasn't the same exact route.

??? any ideas ???

-- 
jeff


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