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CCNP ROUTE Command Guide: Implementing Path Control

Mar 23, 2010

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Configuration Example: Route Maps

Figure 5-2 shows the network topology for the configuration that follows, which demonstrates how to configure route maps using the commands covered in this chapter.

Figure 5-2 Network Topology for Route Map Configuration

Assume for this example that you want to enforce the following policy:

Internet-bound traffic from 192.168.1.0/24 is to be routed to ISP1.
Internet-bound traffic from 172.16.1.0/24 is to be routed to ISP2.
All other traffic to be routed normally according to their destination addresses.

Portland Router

Router>enable	Moves to privileged mode.
Router#configure terminal	Moves to global configuration mode.
Router(config)#hostname Portland	Sets the hostname of this router.
Portland(config)#access-list 1 permit 192.168.1.0 0.0.0.255	Creates ACL 1, which will filter out addresses for our first route map.
Portland(config)#access-list 2 permit 172.16.1.0 0.0.0.255	Creates ACL 2, which will filter out addresses for our second route map.
Portland(config)#access-list 101 permit ip 192.168.1.0 0.0.0.255 172. 16.1.0 0.0.0.255	Creates an extended ACL, resulting in a filter based on both source and destination IP address.
Portland(config)#access-list 102 permit ip 172.16.1.0 0.0.0.255 192.168. 1.0 0.0.0.255	Creates an extended ACL, resulting in a filter based on both source and destination IP address.
Portland(config)#route-map ISP1 permit 10	Creates a route map called ISP1. This route map will permit traffic based on subsequent criteria. A sequence number of 10 is assigned.
Portland(config-route-map)#match ip address 1	Specifies the match criteria—match addresses filtered from ACL 1.
Portland(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 s0/0.
Portland(config-route-map)#exit	Returns to global configuration mode.
Portland(config)#route-map ISP2 permit 10	Creates a route map called ISP2.
Portland(config-route-map)#match ip address 2	Specifies the match criteria—match addresses filtered from ACL 2.
Portland(config-route-map)#set interface serial 0/0/1	Specifies the set actions (what action is to be performed if the match criteria is met); in this case, forward packets out interface s0/1.
Portland(config-route-map)#exit	Returns to global configuration mode.
Portland(config)#route-map 192To172 permit 10	Creates a route map named 192To172. This route map will permit traffic based on subsequent criteria. A sequence number of 10 is assigned.
Portland(config-route-map)#match ip address 101	Specifies the match criteria—match addresses filtered from ACL 101.
Portland(config-route-map)#set interface fastethernet 0/1	Specifies the set actions—forward packets out interface FastEthernet 0/1.
Portland(config-route-map)#exit	Returns to global configuration mode.
Portland(config)#route-map 172To192 permit 10	Creates a route map named 172To192.
Portland(config-route-map)#match ip address 102	Specifies the match criteria—match addresses filtered from ACL 102.
Portland(config-route-map)#set interface fastethernet 0/0	Specifies the set actions—forward packets out interface FastEthernet 0/0.
Portland(config-route-map)#exit	Returns to global configuration mode.
Portland(config)#interface serial 0/0/0	Moves to interface configuration mode.
Portland(config-if)#description link to ISP1	Sets a locally significant description of the interface.
Portland(config-if)#ip address 198.133.219.1 255.255.255.252	Assigns an IP address and netmask.
Portland(config-if)#no shutdown	Enables the interface.
Portland(config)#interface serial 0/0/1	Moves to interface configuration mode.
Portland(config-if)#description link to ISP2	Sets a locally significant description of the interface.
Portland(config-if)#ip address 192.31.7.1 255.255.255.252	Assigns an IP address and netmask.
Portland(config-if)#no shutdown	Enables the interface.
Portland(config)#interface fastethernet 0/0	Moves to interface configuration mode.
Portland(config-if)#ip address 192.168.1.1 255.255.255.0	Configures an IP address and netmask.
Portland(config-if)#ip policy route-map ISP1	Applies the route map named ISP1 to this interface.
Portland(config-if)#ip policy route-map 192To172	Applies the route map named 192To172 to this interface.
Portland(config-if)#no shutdown	Enables the interface.
Portland(config-if)#exit	Returns to global configuration mode.
Portland(config)#interface fastethernet 0/1	Moves to interface configuration mode.
Portland(config-if)#ip address 172.16.1.1 255.255.255.0	Configures an IP address and netmask.
Portland(config-if)#ip policy route-map ISP2	Applies the route map named ISP2 to this interface.
Portland(config-if)#ip policy route-map 172To192	Applies the route map named 172To192 to this interface.
Portland(config-if)#no shutdown	Enables the interface.
Portland(config-if)#exit	Returns to global configuration mode.
Portland(config)#exit	Returns to privileged mode.
Portland#copy running-config startup-config	Saves the configuration to NVRAM.

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