[c-nsp] BGP Route selection

Gary Roberton gary.ciscomail at gmail.com
Fri May 23 12:27:31 EDT 2008


Update - used local preference set on the receiving router and got the
behaviour I wanted.  Thanks to all for help and suggestions.  I did it using
set local-pref on a route map of the receiving router.

Cheers

Have a good weekend.

Gary

On Fri, May 23, 2008 at 4:58 PM, Gary Roberton <gary.ciscomail at gmail.com>
wrote:

> Pete
>
> To clarify  - if I just adjust the local preference on the receiving
> router, that should do it?
>
> But if I didn't have an admin control of the receiving router I would do it
> on the advertising router by requesting a community.
>
> Just sanity checking...
>
>
>
> On Fri, May 23, 2008 at 4:53 PM, Pete Templin <petelists at templin.org>
> wrote:
>
>> Gary Roberton wrote:
>>
>>  Router A BGP table entry is shown here;
>>>
>>> *  90.0.0.0 <http://90.0.0.0>         10.40.1.6 <http://10.40.1.6>
>>>         50             0 64604 1000 i
>>>
>>> *>                  10.40.1.2 <http://10.40.1.2>
>>>      0 64603 1000 i
>>>
>>>
>> Paths come from different neighbor ASes, so MED doesn't apply unless you
>> override default behavior.
>>
>> On most newer IOSes, oldest path wins, so everything's working as
>> expected.
>>
>> You should tweak a different knob to achieve the desired results. Origin
>> code comes to mind as an easy twiddle.  Or, have the remote routers send a
>> community to request a particular local preference (as someone else
>> suggested) - you'll need a community-list and a route-map to catch this.  Or
>> just write a route-map to adjust local-pref or weight upon local receipt of
>> the prefix.
>>
>> pt
>>
>
>


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