Lab 5.5.2 Virtual-Links

Objectives:

  • Configure OSPF Virtual Links

Scenario:

The BubbaGump ISP has merged with the Newton ISP. Unfortunately, the Newton ISP already has an OSPF area 0. They will not renumber their OSPF area 0 so you must create a virtual link between the two companies.

Tasks:

  1. Cable the lab as shown above.

Configure OSPF routing in Area 0, 1, and 0 as shown above. Make sure you use loopback interfaces. Before continuing, what interfaces can you ping?

From the "Router C" console

  1. To configure the virtual link and implement multi-area OSPF between the two companies issue the following commands:

router-c(config)#router ospf 1
router-c(config-router)#area 1 virtual-link 2.0.202.206
router-c(config-router)#^Z

From the "Router B" console

  1. To configure the virtual link and implement multi-area OSPF between the two companies issue the following commands:

router-b(config)#router ospf 1
router-b(config-router)#area 1 virtual-link 1.2.202.206
router-b(config-router)#^Z

WARNING: If you did not use loopback addresses on your routers this will not work.

  1. Enter show ip ospf virtual-links. Report your findings below: