From: Mohammed Al-zubi (mohammed@sulafsolutions.com)
Date: Tue Feb 18 2003 - 05:39:00 GMT-3
check of the "next-hop" addess for that route is reachable from R2, see if
you can ping the link between R1 and R3 from R2
.you can use next-hop-self command, but there are instances were its not
recommended
Mohammed
<><><><><><><><><><><><><><><><><><><><>
Mohammed Al-Zubi
VP Professional Services
24 Werner Ave. #21
Daly City, CA 94014
Tel: (650) 438-6384
Fax: (720) 293-4897
Email: mohammed@sulafsolutions.com
Web: www.sulafsolutions.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Richard Young
Sent: Wednesday, February 12, 2003 10:26 AM
To: ccielab@groupstudy.com
Subject: BGP Multihoming Two IBGP Routers to Two ISPs
Hi,
I have a question about a lab I am working on. The Lab has 5 routers.
R1 and R2 are directly connected ibgp neighbors in AS1001.
R3 is connected as an EBGP neighbor to R1 in AS 300.
R4 is an EBGP neighbor to R2 in AS400.
R5 is an EBGP neighbor ro both R3 and R4 in AS 500
R5 has one loopback 200.100.1.1 /24
R5 has one ethernet 200.100.2.0 /24
After all neighbors are established, I see two bgp paths to both networks
of R5 on R1, but I only see one path to both networks of R5 on R2.
It is like R1 is getting both networks but not forwarding them to R2.
My goal is to use BGP communities to set local preference but without
seeing both paths on both routers with the command "show ip bgp" the
route maps so not see the bgp paths and do not work.
Is there some BGP rule similar to split horizon that prevents IBGP
neighbors from sending all routes to all other fully meshed IBGP neighbors
in the same AS?
Thanks in advance.
Richard
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