Reference Guide

122 | Access Control Lists (ACL), Prefix Lists, and Route-maps
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To view the configuration, use the show config command in the ROUTER OSPF mode (Figure 241) or the
show running-config ospf command in the EXEC mode.
Figure 7-16. Command Example: show config in ROUTER OSPF Mode
No CAM writes happen as a result of resequencing, so there is no packet loss; the behavior is like Hot-lock ACLs.
Route Maps
Route-maps are supported on platforms: c e s
Like ACLs and prefix lists, route maps are composed of a series of commands that contain a matching
criterion and an action, yet route maps can change the packets meeting the criterion. 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 FTOS implementation of route maps allows route maps with no match command or no set command.
When there is no match command, all traffic matches the route map and the set command applies.
distribute-list prefix-list-name in
[interface]
CONFIG-ROUTER-OSPF Apply a configured prefix list to incoming
routes. You can specify an interface.
If you enter the name of a non-existent prefix
list, all routes are forwarded.
distribute-list prefix-list-name out
[connected | rip | static]
CONFIG-ROUTER-OSPF Apply a configured prefix list to incoming
routes. You can specify which type of routes
are affected.
If you enter the name of a non-existent prefix
list, all routes are forwarded.
Command Syntax Command Mode Purpose
FTOS(conf-router_ospf)#show config
!
router ospf 34
network 10.2.1.1 255.255.255.255 area 0.0.0.1
distribute-list prefix awe in
FTOS(conf-router_ospf)#