Sean,
I would assume that R3 also has two BGP routes to R2, but does not have an
entry in the routing table either.
Step 1 of the BGP decision process is to ignore routes with an
inaccessible next hop.
Make sure that R4 knows how to reach the interface(s) advertising the
networks that R1 is advertising. Normally, this would be done with an IGP
such as OSPF, RIP, IGRP, etc; it could be done with static routes, but
this is not a scalable solution.
--phil
On Wed, 4 Oct 2000, Sean Wu wrote:
So what possible reason can cause this problem?
I have four routers,
R1 <-------> R2
^ ^
| |
| |
| |
v v
R3 <-------> R4
AS1: R1
AS2: R2
AS3: R3+R4
IBGP between R3 and R4, EBGP between R1/R2, R2/R4, R1/R3
Everything else looks fine, and almost symetric configuration on R1/R3 and
R2/R4
But R3 can see R2 in routing table and BGP table, while
R4 doesn't see R1's ip in ip routing table, but it does see R1 in BGP table
via two different paths
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