From: David Lonnie (david.lonnie@gmail.com)
Date: Thu Nov 06 2008 - 03:53:14 ARST
Hi,
I think A would be better.
Because R2 receives these routes from 2 paths. One is from R1 with weight
set 100, and another is from R3 with weight set 200.
So the best bgp routes on R2 are learned from R3.
According to ibgp learned routes will never advertise to other BGP
neighbors, R2 will never advertise these routes to R4.
That's why R4 can't receive routes from R2.
David
On Thu, Nov 6, 2008 at 1:29 PM, Jason Madsen <madsen.jason@gmail.com> wrote:
> I'm not exactly sure what you're trying to do in this scenario. Weight is
> locally significant only. It seems as though if you want to choose routes
> from one path over another by means of using Weight in AS2 you'd want to
> apply your weight values on R4. A numerically higher weight (more
> preferred) for the routes learned via either R2 or R3.
>
> Jason
>
> On Wed, Nov 5, 2008 at 10:08 PM, stephen skinner <stephenski@gmail.com
> >wrote:
>
> > 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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