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CCNP ROUTE Command Guide: Implementing Path Control

Sample Chapter is provided courtesy of Cisco Press.
Date: Mar 23, 2010.

Chapter Information

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.
	NOTE In route maps, the default action is to permit.
	NOTE The sequence-number is used to indicate what position the route map is to have in a list of route maps configured with the same name. If no sequence number is given, the first condition in the route map is automatically numbered as 10.
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.
	NOTE If no explicit route exists in the routing table for the destination network address of the packet (that is, the packet is a broadcast packet or destined to an unknown address), the set interface command has no effect and is ignored.
	NOTE A default route in the routing table will not be considered an explicit route for an unknown destination address.
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.
	NOTE This is recommended for point-to-point links only.
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

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