From: stephen skinner (stephenski@gmail.com)
Date: Thu Nov 06 2008 - 04:37:57 ARST
thanks for your responce david ,
So let me just confirm ,
because the routes that would be advertised to R4 after the weight
manipulation would be IBGP routes ( from R3) , instead on EBGP routes from
R1
R2 will no longer advertise them to R4
Yes ?
On Thu, Nov 6, 2008 at 1:53 PM, David Lonnie <david.lonnie@gmail.com> wrote:
> 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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