BGP weight

From: stephen skinner (stephenski@gmail.com)
Date: Thu Nov 06 2008 - 03:08:57 ARST


Hello ,
can i ask a quick question please

My topology

   R1
  | |
R2 R3
   | |
   R4

R1 is in AS1
R2,R3,R4 are in AS2

R1 peers to R2 and R3
R2 and R3 peer to R4

router-id are 1.1.1.1 - 2.2.2.3 - 3.3.3.3 - 4.4.4.4

R2 is setting all incoming routes from AS 1 with a weight of 100
R3 is setting all incoming routes from AS1 with a weight of 200

by default R4 sees routes in its BGP table from both R2 and R3

Question
when i set on R2 the weight of 200 to all incoming routes from R3.
R4 no longer sees any routes in its BGP table from R2.
is this because :-

A R2 is no longer advetising them because the bgp routing process says not
to advertise them to R4

B R4 , the BGP proccess is seeing these routes from R2 with a lower weight
and decides no tto use them.

TIA

stephen

-- 
Only two things are infinite, the universe and human stupidity, and I'm not
sure about the former.

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