From: stephen skinner (stephenski@gmail.com)
Date: Thu Nov 06 2008 - 04:33:12 ARST
R2 /R3 /R4 are all fully meshed , sorry bad diagram ...
i am applying a weight statement to the neibhour
my config is as follows
R1
router bgp 1
network 199.199.1.0 mask 255.255.255.0
network 199.199.2.0 mask 255.255.255.0
network 199.199.3.0 mask 255.255.255.0
network 199.199.4.0 mask 255.255.255.0
neibhour 10.2.2.2 remote-as 2
neibhour 10.2.2.3 remote-as 2
R2
router bgp 2
neibhour 10.2.2.1 remote-as 1
neibhour 10.2.2.1 weight 200
neibhour 10.2.2.3 remote-as 2
neibhour 10.2.2.4 remote-as 2
R3
router bgp 2
neibhour 10.2.2.1 remote-as 1
neibhour 10.2.2.1 weight 100
neibhour 10.2.2.2 remote-as 2
neibhour 10.2.2.2 weight 200
neibhour 10.2.2.4 remote-as 2
R4
neibhour 10.2.2.3 remote-as 2
neibhour 10.2.2.3 remote-as 2
cheers
On Thu, Nov 6, 2008 at 1:51 PM, Jason Madsen <madsen.jason@gmail.com> wrote:
> Hi Stephen,
>
> you mentioned that R2, 3, and 4 are all in AS2, but it appears they're in a
> hub and spoke arrangement. are you using route reflection or a
> confederation configuration? how are you specifying routes learned by R3 on
> R2? i see now why folks don't always answer my questions :-) it's
> difficult to provide feedback when there aren't config's and/or output to
> look at. if no one provides you with a better answer, you may want to post
> some.
>
> Jason
>
> On Wed, Nov 5, 2008 at 10:44 PM, stephen skinner <stephenski@gmail.com>wrote:
>
>> 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.
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> Only two things are infinite, the universe and human stupidity, and I'm
>> not sure about the former.
>>
>
>
-- Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.Blogs and organic groups at http://www.ccie.net
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