[c-nsp] BGP local preference

[Chris Woodfield]

Another solution would be to prepend your ASN one or more times  
outbound on the backup link via an outbound route map. The benefit of  
this over a MED would be that ASN comparison is automatic, whereas  
the downstream router may have to hit a knob (bgp always-compare-MED)  
to make that work.

HTH,

-Chris

On Jan 23, 2007, at 6:25 AM, Frotzler, Florian wrote:

>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net
>> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Michael  
>> Robson
>> Sent: Dienstag, 23. Jänner 2007 11:26
>> To: cisco-nsp at puck.nether.net
>> Subject: [c-nsp] BGP local preference
>>
>> I am administering a Cisco 6500-based core (Sup720s) where I
>> am exchanging routes with edge sites using eBGP. Each site
>> has an uplink to 2 separate core routers and I am using a
>> route map to set the local preference so that the core always
>> prefers one of the site links over the other. I would also
>> like to affect the default route that we are sending them so
>> that when they send traffic out, it prefers the same link,
>> but it appears that you cannot set a local preference on the
>> way out of a router (I guess that's why it's called a "local
>> preference). Is there another way to affect the route to
>> achieve this "default route affecting" (this would be
>> preferred over the site setting the local preference).
>
> The local preference is indeed local to the AS, but the MED  
> attribute was designed to exactly achieve what you want :)
>
> http://www.cisco.com/en/US/tech/tk365/ 
> technologies_tech_note09186a0080094934.shtml
>
>
>> Thanks,
>>
>> Michael.
>
> Cheers,
> Florian
>
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