From: Nathan Chessin (nchessin@cisco.com)
Date: Wed Dec 11 2002 - 22:49:08 GMT-3
Sorry, my diagram got messed up on the send...
This make more sense?
> 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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