Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - Page 743

Configuring RIP parameters 24 Using prefix lists and route maps as route filters You can configure prefix lists to permit or deny specific routes, then apply them globally or to individual interfaces and specify whether the lists apply to learned routes (in) or advertised routes (out). You can configure route maps to permit or deny specific routes, then apply a route map to an interface, and specify whether the map applies to learned routes (in) or advertised routes (out). NOTE A route is defined by the destination's IP address and network mask. NOTE By default, routes that do not match a prefix list are learned or advertised. To prevent a route from being learned or advertised, you must configure a prefix list to deny the route. To configure a prefix list, enter commands such as the following. BigIron RX(config)# ip prefix-list list1 permit 192.53.4.1 255.255.255.0 BigIron RX(config)# ip prefix-list list2 permit 192.53.5.1 255.255.255.0 BigIron RX(config)# ip prefix-list list3 permit 192.53.6.1 255.255.255.0 BigIron RX(config)# ip prefix-list list4 deny 192.53.7.1 255.255.255.0 The prefix lists permit routes to three networks, and deny the route to one network. Since the default action is permit, all other routes (routes not explicitly permitted or denied by the filters) can be learned or advertised. Syntax: ip prefix-list permit | deny | any | any To apply a prefix list at the global level of RIP, enter commands such as the following. BigIron RX(config-rip-router)# prefix-list list1 in Syntax: [no] prefix-list in | out To apply prefix lists to a RIP interface, enter commands such as the following. BigIron RX(config-if-e1000-1/2)# ip rip prefix-list list2 in BigIron RX(config-if-e1000-1/2)# ip rip prefix-list list3 out Syntax: [no] ip rip prefix-list in | out In applies the prefix list to routes the device learns from its neighbor on the interface. Out applies the prefix list to routes the device advertises to its neighbor on the interface. The commands apply RIP list2 route filters to all routes learned from the RIP neighbor on port 1/2 and applies the lists to all routes advertised on port 1/2. To apply a route map to a RIP interface, enter commands such as the following. BigIron RX(config-if-e1000-1/2)# ip rip route-map map1 in Syntax: [no] ip rip route-map in | out The route-map can be a prefix list or an ACL. Setting this command can change the metric. In applies the route map to routes the device learns from its neighbor on the interface. Out applies the route map to routes the device advertises to its neighbor on the interface. BigIron RX Series Configuration Guide 671 53-1001810-01