Lab 5.4.5 Multi-Area OSPF Routing -- Stub and Totally Stubby Areas

Objectives:

  • Configure OSPF Area 1 as Stub and Totally Stubby

Scenario:

The BubbaGump ISP wants to limit the number of routes that enter Area 1 so you have been called to setup the area as STUB.

Tasks:

From the "Router D" console

NOTE: Ping all interfaces before beginning.

  1. Enter show ip ospf neighbor

What is the neighbor state?

  1. To configure an area OSPF as stub issue the following commands:

router-d(config)#router ospf 1
router-d(config-router)#area 1 stub
router-d(config-router)#control Z

  1. Enter show ip ospf neighbor

What is the neighbor state now? Why?

  1. Enter show ip route

What routes are now available?

From the "Router C" console

  1. Enter show ip route and show ip ospf neighbor. Report your findings below:

  1. To configure this OSPF router as a stub issue the following commands:

router-c(config)#router osfp 1
router-c(config-router)#area 1 stub
router-c(config-router)#control Z

Enter show ip route and show ip ospf neighbor

What changed? Why?

From the "Router B" console

  1. Enter show ip route and show ip ospf neighbor. Report your findings below:

  1. To configure area 1 only as a stub issue the following commands:

router-b(config)#router osfp 1
router-b(config-router)#area 1 stub
router-b(config-router)#control Z

  1. Enter show ip route and show ip ospf neighbor

What changed? Why?

From the "Router D"console

  1. Enter show ip route

Is there a gateway of last resort set? Why?

What routes are listed?

Scenario:

You have now been instructed by the BubbaGump ISP to make area 1 a totally stub network.

From the "Router B" console

  1. To configure this OSPF area as totally stub issue the following commands:

router-b(config)#router osfp 1
router-b(config-router)#no area 1 stub
router-b(config-router)#area 1 stub no-summary
router-b(config-router)#area 1 default-cost 10
router-b(config-router)#control Z

From the "Router D" console

  1. Enter show ip ospf border-router and show ip route

What routes are now listed?