iBGP next hop and multi-access media

Mon Oct 7 01:17:39 UTC 2002

Really, the only way this could happen is if Router B is not announcing its
routes to 172.16.16/24 and Router A has a default route to its Ethernet
interface.

C.

-----Original Message-----
From: Ralph Doncaster [mailto:ralph at istop.com] 
Sent: Sunday, October 06, 2002 9:06 PM
To: E.B. Dreger
Cc: nanog at merit.edu
Subject: Re: iBGP next hop and multi-access media

> RD> When I setup a situation like the above, with Router B advertising 
> RD> the 172.16.16.0/24 to router A, router A sees a next hop of 
> RD> 10.10.10.2.  This is not good since packets from A going to the 
> RD> 172.16.16 subnet get sent to Router B, which then ARPs the 
> RD> desitnation, instead of just being ARPed by router A.
> 
> Is this what you're trying to do:
> 
> 	route-map <foo>
> 	 match <whatever>
> 	 set ip next-hop <something>

Not really, what I want is router A to learn that ther is no next hop IP-
the subnet is on the local ethernet.

-Ralph