BGP hidden best path selection ?

From: Kay D (krsna83@gmail.com)
Date: Mon Jun 05 2006 - 08:20:49 ART


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



This archive was generated by hypermail 2.1.4 : Sat Jul 01 2006 - 07:57:32 ART