From: Athaide, Dwayne (DAthaide@eprod.com)
Date: Sat Mar 29 2008 - 00:02:13 ART
Thanks I think I got a handle on this.
Thanks again
-----Original Message-----
From: Chris McGuire [mailto:cmcguire@firstdigital.com]
Sent: Friday, March 28, 2008 10:00 PM
To: Athaide, Dwayne; groupstudy
Subject: Re: help with bgp
The best way to satisfy your requirement would be with changing the
Weight
on R3 inbound from the external AS to a higher priority. This will cause
R3
and R3 alone to prefer the route out. Other routers in their AS will
continue to use the Local preference assigned by R1.
I understand the logic of EBGP (pref 20) over Ibgp (pref 200). However,
BGP
will not look at this until way down the line. It will first look at the
Weight, then the local preference.... And actually 9th preference
prefers
EBGP over IBGP. So using the Weight would be optimal for your
requirement.
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.h
tml#
wp1000898
HTH
-chris
On 3/28/08 2:01 PM, "Athaide, Dwayne" <DAthaide@eprod.com> wrote:
> (R1-R2-R3)
>
> Is there a way to stop the propagation of a modified local preference
> value within an AS without making any configuration to the router that
> needs to keep its default value. In this case R3. For example R1 and
R3
> are connected to the same external AS and learning routes from the AS.
> R1 has modified the routes learnt via the external AS by using local
> preference. R2 now gets those routes and passes it on to R3. Now R3
> uses R1 as an exit point. Anyway to have R3 ignore the higher local
> preference it learns on R3 and have it exit directly by not making any
> changes on R3.
>
> Thanks
>
>
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