BGP: Difference between revisions
→Filter with Route Maps
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=Filter with Route Maps=
*Route maps are very powerful filtering tools, they can be used to accomplish the following tasks:
Filter on IP prefixes coming from a specific autonomous system
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Modify BGP attributes
*Match clauses in the BGP route map can be based on the following:
IP network numbers and subnet masks (prefix list or access list)
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IGP route type
*With a route map, the following can be set:
Origin
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MED
*You can apply a route map on incoming or outgoing routing information for a neighbor.
*The routing information must be permitted by the route map to be accepted.
*If the route map has no statement explicitly permitting a route, the route is implicitly denied and dropped.
*The syntax required is as follows:
Router(config-router)# neighbor ip-address route-map name in|out
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