In the referenced message, Ralph Doncaster said: > > > BGP will discard any prefix with its own AS in the path, for loop > > prevention. Hence, one half of the AS would still be unable to > > reach the other half. This is why a partitioned AS is a failure > > condition. A tunnel is a means to keep the AS nonpartitioned. > > I was thinking of doing iBGP over my transit connections (with a couple > of static routes so the iBGP works) AND over my inter-city circuit. Any > reason why this won't work? > > -Ralph
The loss of igp metric will make it untenable at best. Do it over a GRE tunnel, with your regular igp (isis, ospf, eigrp, or shudder rip). default routes have their own problems which only treat the symptoms of a partitioned as, rather than the problem.