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CCNP ROUTE Command Guide: Implementing Path Control

Chapter Description

This chapter helps you prepare for the CCNP ROUTE exam by covering the following topics related to implementing path control: Offset lists, Cisco IOS IP Service Level Agreements, and Policy routing using route maps. It also uses route maps as a Configuration example.

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Policy Routing Using Route Maps

Router(config)#route-map ISP1 permit 20

Creates a route map named ISP1. This route map will permit traffic based on subsequent criteria. A sequence number of 20 is assigned.

Router(config-route-map)#match ip address 1

Specifies the match criteria (the conditions that should be tested); in this case, match addresses filtered using ACL 1.

Router(config-route-map)#set ip next hop 6.6.6.6

Specifies that packets that pass a match are output to the router at IP address 6.6.6.6.

Router(config-route-map)#set interface serial 0/0/0

Specifies the set actions (what action is to be performed if the match criteria is met); in this case, forward packets out interface serial 0/0/0.

Router(config-route-map)#set ip default next hop 6.6.6.6

Defines where to output packets that pass a match clause of a route map for policy routing and for which the Cisco IOS software has no explicit route to a destination.

Router(config-route-map)#set default interface serial 0/0/0

Defines where to output packets that pass a match clause of a route map for policy routing and have no explicit route to the destination.

Router(config-route-map)#exit

Returns to global configuration mode.

Router(config)#interface fastethernet 0/0

Moves to interface configuration mode.

Router(config-if)#ip policy route-map ISP1

Specifies a route map to use for policy routing on an incoming interface that is receiving the packets that need to be policy routed.

Router(config-if)#exit

Returns to global configuration mode.

Router(config)#ip local policy route-map ISP1

Specifies a route map to use for policy routing on all packets originating on the router.

Router(config)#interface fastethernet 0/0

Moves to interface configuration mode.

Router(config-if)#ip route-cache policy

Enables fast-switched policy routing.

A fast-switched PBR supports all the match commands and most of the set commands except for the following:

  • The set ip default next-hop command is not supported.
  • The set interface command is supported over point-to-point links, unless a route cache entry exists that uses the same interface that is specified in the set interface command in the route map.
Router#show ip policy

Displays route maps that are configured on the interfaces.

Router#show route-map 
                  [map-name]
               

Displays route maps.

Router#debug ip policy

Enables the display of IP policy routing events.

Router#traceroute

Enables the extended traceroute command, which allows the specification of the source address.

Router#ping

Enables the extended ping command, which allows for the specification of the source address.

4. Configuration Example: Route Maps | Next Section Previous Section