Users Guide

Dell# show running-config acl
!
ip access-list extended test
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 prex 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.
Implementation Information
ACLs and prex lists can only drop or forward the packet or trac. Route maps process routes for route redistribution. For example,
a route map can be called to lter only specic routes and to add a metric.
Route maps also have an “implicit deny.” Unlike ACLs and prex lists; however, where the packet or trac is dropped, in route maps,
if a route does not match any of the route map conditions, the route is not redistributed.
The implementation of route maps allows route maps with the no match or no set commands. When there is no match command, all
trac 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
dierent), matching a packet against these clauses is a logical OR operation.
– Two or more match clauses within the same route-map sequence have dierent 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 specied route-map sequence is processed after a
match is found.
Conguration Task List for Route Maps
Congure 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 conguration tasks for route maps, as described in the following sections.
• Create a route map (mandatory)
• Congure route map lters (optional)
• Congure a route map for route redistribution (optional)
• Congure a route map for route tagging (optional)
Creating a Route Map
Route maps, ACLs, and prex lists are similar in composition because all three contain lters, but route map lters do not contain the
permit and deny actions found in ACLs and prex lists.
Route map lters match certain routes and set or specic values.
Access Control Lists (ACLs)
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