From: stephen skinner (stephenski@gmail.com)
Date: Thu Nov 06 2008 - 03:44:23 ARST
hi jason ,
thanks for your reply
i setup this config last night and noticed that when i set the inbound
weight of routes from R3 on R2 to 200 ,
R2 set its prefered route to get to AS1 by R3 ( which is the desired
result)
when i cleared by bgp neibhours on R2 , i noticed that R4 lost all the R2
routes from its BGP routing table ,
i then unset the weighting on R2 , then cleared the bgp neibhour states,
i treid this setting and unsetting several times and got the same results.
i am just not sure why ??
is R2 now not sending the routes or is R4 discounting these routes ??
or is it just me ???
cheers
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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