Lab 8.5.2: On Demand Routing (ODR)

Objectives:

  • Configure ODR over a frame relay connection and redistribute ODR into IGRP.

Scenario:

You have been contracted by a small bank to install a Frame Relay network to connect their offices in Atlanta and Houston. The frame relay cloud may grow at a later date and to avoid the headache of numerous static routes on the Atlanta hub router, you decide to configure ODR. You have ordered Frame Relay service from a national Frame Relay service provider and have received the DLCIs in the above diagram. Routing should be handled using IGRP. Lastly, the ODR information needs to be redistributed into IGRP.

Notes: 

Lab Tasks:

  1. Cable the lab as shown in the diagram. Use the Adtran Atlas 550 to simulate the Frame Relay network.
  2. Configure all of the serial interfaces that connect to the Frame Relay network for Frame Relay encapsulation and set the LMI type to ANSI.
  3. Configure IP addresses on the interfaces as shown above.
  4. Frame Relay map commands must be used to map the IP addresses on the opposite end of the PVC to the associated DLCIs:

    • On the Atlanta router:

    Atlanta(config)#int s0/0
    Atlanta(config)#frame-relay map ip 192.168.4.3 18 broadcast

    • On the Houston router:

    Houston(config)#int s0/0
    Houston(config-if)#frame-relay map ip 192.168.4.1 16 broadcast

  5. Check your PVCs to make sure they are active.

    What command should be used to verify the operation of the PVCs?


  6. If your PVCs are active, attempt to ping to each address in the network. Record your results.






  7. What command can be used to check your Frame Relay maps?


  8. Configure a default route on the Houston router that sends all packets to Atlanta.

    What is the command to do this?


  9. Verify connectivity between Houston and Atlanta.
  10. Configure IGRP routing on the Atlanta router and advertise all directly connected networks. Be sure to prevent updates from being sent out the serial interface with the passive-interface command.
  11. Examine the routing table of Atlanta. Document your findings below. Do you see the Houston LAN advertised?
  12. Now it is time to configure ODR. ODR requires only one command for configuration. The command is :

    Atlanta(config)#router odr

    Note: Be sure that CDP is enabled on the Atlanta and Houston Routers!

  13. Now examine the routing table of Atlanta again. What do you notice that is different?






  14. ODR information can easily be redistributed into another routing protocol. Configure the Atlanta2 router as shown in the diagram . Configure IGRP routing for AS 100 and advertise the directly connected networks. Verify that the IGRP routes appear in the Atlanta and routing tables.
  15. To redistribute ODR into IGRP, issue the following commands:

    Atlanta(config)#router igrp
    Atlanta(config-router)#default-metric 1000 100 250 100 1500
    Atlanta(config-router)#redistribute ODR

  16. Login to the LAN router again. Did the route for 192.168.3.0 appear in the routing table?


  17. You have now configured ODR routing with redistribution into the core network. Whenever additional frame-relay connections are added, the only configuration needed will be at the branch router and a map command for frame-relay on the Atlanta router!