Networking 201

Copyright Priscilla Oppenheimer

Lab 4 IP Routing: OSPF and BGP

Scenario

You are a senior network administrator who has the job of installing a complex internetwork to connect various branch offices for a large company. You have decided to upgrade the routing to OSPF. You will also experiment with BGP.

Check the Current Status of IP Routing.

  1. Use the show ip protocol command to determine what routing protocol is currently in use, then remove it with a no command.
    1. For example, on the routers use the no router eigrp 100 command to remove EIGRP.

OSPF Link-State Routing

  1. On the routers, configure OSPF with the following commands:
    1. router ospf 100
    2. network 192.168.0.0 0.0.255.255 area 0
  2. Unfortunately, the PIX firewall doesn't support OSPF.
    1. If you are on a PIX, you can use default routing with the following command:
    2. route inside 192.168.0.0 255.255.0.0 192.168.20.4 1
  3. Check your work (and your cohorts' work) with the following commands.
    1. show ip route
    2. show ip interface
    3. show ip protocol
    4. show ip ospf
    5. show ip ospf database
    6. show ip ospf neighbor
    7. show ip ospf interface
    8. debug ip ospf events
  4. Test the network by pinging to all other devices. Can you reach every other device? Can you still reach the Internet?

BGP Path-Vector Routing

  1. On the routers, disable OSPF with the following command:
    1. no router ospf 100
  2. Work with your colleagues to select a unique autonomous system number for each network.
  3. Configure BGP with the following commands.
    1. router bgp <your autonomous system>
    2. network <your network> mask 255.255.255.0
    3. neighbor <IP address of your neighbor> remote-as <your neighbor's autonomous system>
  4. Test BGP with the following commands.
    1. show ip route
    2. show ip bgp
    3. show ip bgp neighbors
    4. show ip bgp paths
    5. show ip bgp summary
  5. Test the network by pinging to all other devices. Can you reach every other device? Can you still reach the Internet?

Submission

Write a short lab report that summarizes your work and any problems you ran into. The lab report should cover:

  1. State of the network before you made any changes
  2. Major changes that you made to the network
  3. Any problems you encountered
  4. Conclusions about the health of the network in its new state

Submit your report

  1. Attach an MS Word-compatible file to the assignment.
  2. Your report should be about 1/2 page long, using a 12-point font and double spacing. It doesn't have to be anything fancy.