Install guide

Software Version 2.7.4 39

Software Version 2.7.4

C613-10444-00 REV A

OSPF: Route Filtering with Route Maps

This enhancement enables you to configure route maps to filter OSPF routes.

Route maps allow you to configure complex flexible filters. They achieve this

by having several levels of structure:

■ each route map consists of multiple entries

■ each entry consists of an action (include or exclude) and at least one clause:

• zero or one match clauses, which determine which OSPF route attributes

match the entry. If you do not specify a match clause, every route

matches.

The match fields relevant for OSPF are interface, prefix list, next hop,

route source, metric, route type and tag.

• zero or more set clauses, which change the attributes of matching

routes.

The set clauses relevant for OSPF are metric, type and tag.

You can use the route map in OSPF:

■ to filter OSPF routes before adding them to the IP route table for IP to use.

To do this, create the route map and use it in the command:

set ospf inroutemap=routemap-name

■

when redistributing static routes as OSPF AS external LSAs. See “OSPF:

Redistributing Static Routes” on page 46.

Modified Commands

For the add ip routemap and set ip routemap commands, this section only lists

the command syntax that is relevant for OSPF. Further options for BGP are

described in the Border Gateway Protocol version 4 (BGP-4) chapter of your

router or switch’s Software Reference.

add ip routemap

Syntax for

match clauses