From: Zhonglin Zhou (zhouzl@xxxxxxxxxxxxxx)
Date: Tue Sep 14 1999 - 01:14:18 GMT-3
On Mon, 13 Sep 1999 10:35:01 -0700
"Peter Van Oene" <vantech@sympatico.ca> wrote:
> Can anyone clarify if my understanding of route-maps is correct?
>
> I see them used in two places:
>
> 1: Directing routed packets
> By using policy routing, packets flowing through the router can
> be policy routed via the route map statements. Specifics like
> next hop or interface to be forwarded on make these modifications.
> In essence, packets matching the match criteria are pulled out of the
> normal routing process and are policy routed. Packets not matching
> a match criteria are forwarded to the normal routing process.
>
> 2: Influencing IGP redistribution
> At an point of IGP or IGP to EGP redistrbution, route-maps enable
> an administrator to modify route parameters like metrics, metric types,
> and specific BGP paramaters. Packets not matching a match criteria
> are not redistributed. Hence it is useful to add a default match
> criteria
> if your intent is only to modify some routes but continue to redist the
> rest
>
> The key point is that Route-maps are not used within a single IGP to
> modify IGP paramenters - For example, if I config an ip local policy
> route-map to modify OSPF metric types, it simply isn't going to do
> anything.
>
I believe you can change the metric type in ospf using route-map, I have
done so before.
> Am I correct in my statements or I am missing something?
>
> (sometimes when prepping for the lab I find you distance yourself
> from practicality and try to achieve the unnecesary ::)
>
>
> Peter Van Oene
> Senior Systems Engineer
> UNIS LUMIN Inc.
> www.unislumin.com
>
>
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