Lab  7.3.5 Simple Route Map 

Objectives:  

  • Configure a simple route-map to control traffic flow.

Scenario:  

Based on your current configuration, all traffic destined for network 192.168.1.0 originating from 192.168.4.0 will travel via 192.168.3.0. Your task is to configure a route-map that will send all traffic destined for 192.168.1.0 via 192.168.2.0.

Initial Configuration:

Configure the above network as shown in the diagram above. Use OSPF as your routing protocol. Also, on interface S 0/0, issue the command bandwidth 128. This will make the link between Routers A and B appear to be slower than the link between Routers A and C, forcing OSPF to choose the link between A and C as the optimum path to 192.168.1.0. Verify all links are operational and use the trace command to verify traffic from 192.168.4.0 destined for 192.168.1.0 is using the link between Routers A and C. Now you can begin the actual lab!

Configuring the Route map:

  1. Traffic will be entering Router A via Ethernet 0. So we must activate a route map on that interface. In this lab we will name the route map CHANGEROUTE. To enable the route map on an interface, issue the command:

    RouterA(config-if)# ip policy route-map CHANGEROUTE
  2. Next we will need an access list statement in order to identify the packets that need to be policy routed. In this case, it will be packets from 192.168.4.0. This can be taken care of with a standard access list statement:

    RouterA(config)#access-list 1 permit 192.168.4.0 0.0.0.255

  3. It is now time to configure the actual route map. The first step is to configure an instance of the route map. The second step is to identify the packets that need to be route mapped. The third step to tell the router where to send the packet. Use the following commands:

    RouterA(config)# route-map CHANGEROUTE permit 10 
    RouterA(config-route-map)# match ip address 1 
    RouterA(config-route-map)# set interface serial 0/0

  4. Verify that the route map is functioning. To view the process, issue the debug ip policy command and then ping from the workstation on 192.168.4.0.

    What are the results of the debug ip policy command?



    What other command could you use to verify the route map is working and your packets are traveling over the desired link?