Chapter 9 : Lab 9.3.3 Troubleshooting OSPF Routing Issues

Step 1: Connect the equipment

  1. Connect the Fa0/0 interface of each router to the Fa0/1 interface of each switch using a straightthrough cable.
  2. Connect each host to the Fa0/2 switch port of each switch using a straight-through cable.
  3. Connect serial cables from each router to the other routers according to the topology diagram.

Step 2: Load the preconfiguration on R1

  1. See your instructor to obtain the preconfigurations for this lab. Instructor note: The preconfigurations are included at the end of this lab.
  2. Connect a Host H1 to the console port of Router 1 for loading the preconfigurations using a terminal emulation program.
  3. Transfer the configuration from H1 to Router 1:

1) In the terminal emulation program on the PC, choose Transfer > Send Text File.

2) Locate the file for the configuration of Router 1 provided by your instructor and choose Open to start the transfer of the preconfiguration to Router 1.

3) When the transfer is complete, save the configuration.

Step 3: Load the preconfiguration on R2

Copy the preconfiguration on R2 using the process detailed in Step 2.

Step 4: Load the preconfiguration on R3

Copy the preconfiguration on R3 using the process detailed in Step 2.

Step 5: Troubleshoot Router R1 Issues

You are a network administrator, located at the same site as the R1 router, and a user calls the help desk stating that they cannot connect to a file server. You determine that the user is on the network (R1) and that the server is on the network (R3). You visit the user and begin troubleshooting.

  1. Begin troubleshooting at host H1 connected to the R1 router
  2. b. Examine the R1 router to find possible configuration errors. Begin by viewing the summary of status information for each interface on the router.
  3. Check to see if there are routes to the other networks by examining the output of the show ip

route command.

  1. Check the OSPF neighbor adjacencies on R1 using the show ip ospf neighbors command.

Step 6: Troubleshoot Router R3 Issues

  1. To help diagnose potential problems with R3, telnet from R1 to the R3 router using the IP address of the R3 S0/0/0 interface ( and enter the vty password (cisco) for R3 when prompted. Enter privileged EXEC mode (password class).
  2. While connected to R3 via Telnet, use the show ip route command to see which OSPF routes R3 has learned.
  3. Use the show ip protocols command to determine which networks R3 is advertising.


Step 7: Troubleshoot Router R2 Issues – Part A

You have resolved the problems with access to the file server on the network.

Step 8: Troubleshoot Router R2 Issues – Part B

Although you resolved the problem with OSPF area mismatch on the R2 WAN link, many of your users stillcannot connect to the ISP through R2. You suspect that the problem is still with R2 but is not related to theOSPF area mismatch problem solved earlier.

  1. To verify this, issue more test pings to the ISP.
  2. You note that only users on the R2 LAN can access the Internet and users on R2 and R3 LANs cannot.


Step 9: Reflection

A number of configuration errors appeared in the preconfigurations that were provided for this lab. Use this space below to write a brief description of the errors that you found on each router.?

The student should briefly summarize the errors identified in this lab


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