North American Network Operators Group
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Re: BGP and aggregation

  • From: Stephen Griffin
  • Date: Mon May 13 17:45:10 2002 
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.