From: Kay D (krsna83@gmail.com)
Date: Mon Jun 05 2006 - 12:54:46 ART
Hi Chris,
Yes both the BB routers were transmitting the same info
.And there is no manipulation on the attributes including AS Path .Please
let me know if there if could be another way out .
I am just wondering if cost "extcommunity" would make a difference
,have not tried it though .
KayD
On 6/5/06, Chris Lewis <chrlewiscsco@gmail.com> wrote:
>
> I do not tihnk you have given enough information. Were the backbones
> sending identical updates? Was one BB router sending updates with AS path
> prepend?
>
> Although you can do very complex things with BGP, it operates in a very
> simple way. Know the BGP path selection process from the documentation CD
> and basically route selection can only follow that process
>
>
> On 6/5/06, Kay D <krsna83@gmail.com> wrote:
>
> > Hi ,one of my colleagues had asked me this question
>
> B1---R2-----R3----R4----B2
>
> R2-confed as 64112 -AS 31
> R3-confed as 64111 -AS 31
> r4-confed as 64111 -AS 31
>
> B1- AS 30
> B2- AS 30
>
> B1 and B2 were pumping similiar routes
>
> R2 for some reason was choosing the routes from B2
> although i could see that Weight,local pref nor any visible attributes
> were
> manipulated in "sh ip bgp"
>
>
> (i tried to do a recreate of the same setup but R2 was choosing the route
> from B1)
>
>
> Questions :
>
> 1. )please help me understand why R2 is selecting the route from B2
>
> 2.)how do i go about in making R2 select routes from B1 "only by
> configuring R2 and not by manipulating weight and local
>
> preference "
>
> Please post your ideas
>
>
> Thanks ,
> Kay D
>
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