From: Nathan Chessin (nchessin@cisco.com)
Date: Wed Dec 11 2002 - 22:17:44 GMT-3
Hi All,
Something I am not sure about with BGP. If I have 3 different ASs, and one
transit AS, should I be doing mutual redistribution between BGP and IGP on
both routers?
____ ____________________________ _______________
AS 1 | eBGP |AS 2 | eBGP |AS 3 |
____ |---------------| R1 ------- R2 -------- R3 --------
R4| -----------------|______________|
-------------------------------------------------|
In this scenario, should I be performing mutual redistribution between the
IGP and BGP in AS 2 on R1 and R4, or will this confuse the process? It
appears to me that if I do mutual redistribution on both routers R1 and R4,
then it will seem like the same routes will be coming from multiple places.
So, I guess I could put a route-map on R1 only allowing the routes coming
from AS 1 to be redistributed into the IGP, and a route-map on R4 only
allowing routes coming from AS 3 to be redistributed into IGP.
If I redistribute IGP into BGP on R1, won't it be sent to R4 via BGP? So
the question is should I then redistribute IGP into BGP on R4 again?
Thanks,
Nate
.
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