Lab 5.3.3 Area Range

Objectives:

  • Configure OSPF to summarize addresses within an area.

Scenario:

You have been hired by The Washington Post to setup a WAN for their 3 sites. You must setup sites in summarizable groups of addresses to reduce the number of routes in the routing table. You must use the area range command to summarize OSPF Area 2.

Tasks:

  1. Cable the lab as shown above.

Configure OSPF routing in Area 0, 1 and 2 as shown above. Ping all interfaces before continuing.

  1. Enter show ip route

Are there two separate routes to the 206.202.16.0 and 206.202.31.0 networks?

From the "Router B" console

  1. To setup multi-area OSPF summarization on this router issue the following commands:

router-b(config)#router ospf 1
router-b(config-router)#area 2 range 206.202.16.0 255.255.240.0
router-b(config-router)#^Z

From the "Router A" console

  1. Enter show ip route

What does "IA" represent?

How many bits are in the route for 206.202.16.0 ? Why?

What is the range of networks being advertised?

  1. Ping and trace to 206.202.31.1

What did the router reply with?

  1. Enter trace 206.202.18.1

What did the router reply with? Report your findings below: