[c-nsp] as path filtering in route map policy

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Wed Sep 22 11:05:12 EDT 2004


cisco-nsp-bounces at puck.nether.net <> wrote on :

> cocconi at canl.net :
>> I'm trying to do a route selection on a bgp prefix but when I use the
>> config below, all the packets are matched by the first route-map. Is
>> it possible to use the ip as-path access list in this  case ?
> 
> It's not possible and is disappointing. I'd really, really like to be
> able to use as_path in route-maps for policy routing and
> policing/shaping, also. 

The problem is the fact that the as-path is not stored in the FIB, so we
can't use it in the forwarding path. For QoS, you might want to check
out the "QoS Policy Propagation via Border Gateway Protocol" feature
which allows you to set the IP precedence based on
as-path/community/whatever..

	oli



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