322 Chapter 9: WAN Design Considerations
Scenarios
Scenario 1
Administrator Yoko has been tasked with making Beetlenet more reliable. In its current
configuration, the routers on Beetlenet are configured in a hub and spoke configuration, as
shown in Figure 9-12. Router Ringo, Router George, and Router Paul must route their traffic to
Router John.
Figure 9-12
Beetlenet
As the central hub and lead, Router John passes any data sent from one spoke router to the other
spoke routers. As lead router, John likes controlling the show. John does a good job for the most
part, but every now and then, after a wild night of routing, John has been known to throw up a
packet or two the next morning. When that happens, Router John can become a single point of
failure for the network. What are Ringo, George, and Paul to do?
1
How could you use load balancing to make Beetlenet more reliable?
2
Draw a proposed network diagram of Beetlenet with load balancing.
3
Verify that load balancing is occurring between networks.
4
What commands would you use? (Hint: Use show commands to verify that load balancing
is occurring between networks.)
5
What routing protocols could be loaded?
Scenario 2
Router John and Router Ringo have unequal-cost paths. Router John's S0 is connected at 56
Kbps, and Router John's S1 is connected at T1.
How might load balancing be accomplished when the costs are unequal?
Router John
Router George
Router Ringo
Router Paul
87200333.book Page 322 Wednesday, August 22, 2001 2:53 PM