Lab 4.2.3 OSPF Timers

Objective:

Configure OSPF timers.

Scenario:

You have been called back by the ISP because their routers are not forming adjacencies with the routers you installed. They claim that they are getting timer errors?

From the "Router A" console

  1. Enter enable exec mode and issue the command show ip ospf interface fastethernet 0/0

What are the timer values currently set for Hello and Dead?

  1. Manually change the hello and dead interval on the fastethernet interfaces by issuing the following commands:
  • router-a(config)#interface fastethernet 0/0
  • router-a(config-if)#ip ospf hello-interval 30
  • router-a(config-if)#ip ospf dead-interval 120
  • router-a(config-if)#control Z
  1. Write the running-configuration to memory and issue the command show ip ospf neighbor

What routers are listed

  1. Enter show ip ospf database

What routers are listed?

From the "Router B" console

  1. Enter enable exec mode and change the timer values on "Router B"
  2. After about a minute, enter show ip ospf neighbor

What routers are listed?

  1. Enter debug ip ospf adj and record your findings below:

  1. Change the timer values on all the routers in OSPF area 0, write the running-configurations of all the routers to memory, and reboot all routers in OSPF area 0.

From the "Router B" console

  1. Enter enable exec mode and issue the command show ip ospf neighbor
  2. List below the router IDs of the routers in OSPF area 0