BGP Local pref with Route-map

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Dec 13th, 2008
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hi,

In CBT Nuggets, Jeremy says that, if we do not specify a permit statement at the end of the route-map, all unmatched routes will be discarded.

However, in Cisco IOS Cookbook, I read that even if we do not specify a permit statement at the end, all routes will submit to the standard routing process.

Any clarification?

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Giuseppe Larosa Sat, 12/13/2008 - 11:47
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hello Wassim,

my understanding is the following:

when an empty final permit statement is needed or not depends on the route-map usage:


-if the route-map is used to perform route filtering and manipulation all unmatched prefixes will be discarded: not sent to a BGP neighbor or not considered in protocol redistribution.


- if the route-map is used for PBR packets not matching any route-map block will be not discarded but routed normally using standard unicast destination based routing


Hope to help

Giuseppe


Richard Burts Sat, 12/13/2008 - 19:06
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Giuseppe


Well explained and exactly correct.


HTH


Rick

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