On Friday, November 25, 2011 12:04:04 AM Oliver Boehmer (oboehmer) wrote: > But have you thought about orignating the aggregates you > advertise to the Internet (and customers) via some > central routers in your core, for example some RRs, > instead of on the edge(s)? This way you will never > advertise them in case your edge devices become isolated > (which, if I read you correctly, is the purpose of this > exercise?). > > If you chose this approach, you might also want to > advertise these aggregates with a special next-hop (like > a private 10.1.1.1), and add a static null0 to > 10.1.1.1/32 on all your BGP routers. Then every router > seeing the aggregate will automatically create a Null0 > and will drop all packets to unallocated address space > within these aggregates as soon as it enters your > network?
Exactly what we do - routes are originated from our route reflectors, announced into the network with a next-hop of '192.0.2.1' and '2001:db8::1'. Never had to worry about dead peering routers causing blackholes. Cheers, Mark.
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