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remark 2 XYZ
remark 4 this remark corresponds to permit any host 1.1.1.1
seq 4 permit ip any host 1.1.1.1
remark 6 this remark has no corresponding rule
remark 8 this remark corresponds to permit ip any host 1.1.1.2
seq 8 permit ip any host 1.1.1.2
seq 10 permit ip any host 1.1.1.3
seq 12 permit ip any host 1.1.1.4
Route Maps
Although route maps are similar to ACLs and prefix lists in that they consist of a series of commands that
contain a matching criterion and an action, route maps can modify parameters in matching packets.
ACLs and prefix lists can only drop or forward the packet or traffic. Route maps process routes for route
redistribution. For example, a route map can be called to filter only specific routes and to add a metric.
Route maps also have an “implicit deny.” Unlike ACLs and prefix lists; however, where the packet or traffic
is dropped, in route maps, if a route does not match any of the route map conditions, the route is not
redistributed.
Implementation Information
The implementation of route maps allows route maps with the no match or no set commands. When
there is no match command, all traffic matches the route map and the set command applies.
Important Points to Remember
• For route-maps with more than one match clause:
– Two or more match clauses within the same route-map sequence have the same match
commands (though the values are different), matching a packet against these clauses is a logical
OR operation.
– Two or more match clauses within the same route-map sequence have different match
commands, matching a packet against these clauses is a logical AND operation.
• If no match is found in a route-map sequence, the process moves to the next route-map sequence
until a match is found, or there are no more sequences.
• When a match is found, the packet is forwarded and no more route-map sequences are processed.
– If a continue clause is included in the route-map sequence, the next or a specified route-map
sequence is processed after a match is found.
Configuration Task List for Route Maps
Configure route maps in ROUTE-MAP mode and apply the maps in various commands in ROUTER RIP
and ROUTER OSPF modes.
The following list includes the configuration tasks for route maps, as described in the following sections.
• Create a route map (mandatory)
• Configure route map filters (optional)
• Configure a route map for route redistribution (optional)
• Configure a route map for route tagging (optional)
Access Control Lists (ACLs)
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