Scenario

Given the configuration of EIGRP in Example 7-5, perform the tasks and answer the questions listed. The WAN has light user traffic and is a hub-and-spoke configuration, as shown in Figure 7-13.

Example 7-5 Scenario 7-2 Configuration interface Serial 0

encapsulation frame-relay interface Serial 0.1 point-to-point bandwidth 25

ip bandwidth-percent eigrp 123 90

interface Serial 0.2 point-to-point bandwidth 25

ip bandwidth-percent eigrp 123 90

The 256 kbps access line to the hub has 56 kbps access lines to each of 10 spoke sites. Each link has a Frame Relay CIR of 56 kbps. The access line to each router reflects the CIR. The access line to the hub router, Router A, is 256 kbps, but the CIR of the hub is the same as its access line.

From a Frame Relay perspective, it is said that a circuit is oversubscribed when the sum of CIRs of the remote circuits is higher than the CIR of the hub location. With 10 links, each with a CIR of 56 kbps, this circuit is clearly oversubscribed.

Figure 7-13 Diagram for Scenario 7-2

Figure 7-13 Diagram for Scenario 7-2

1 How much bandwidth has each circuit been allocated? Why was this value chosen by the administrator?

2 What bandwidth utilization is available to EIGRP? Why was this value chosen by the administrator?

4 Is summarization possible only on the routers entering the WAN cloud, or is it possible on the networks not shown in the figure, but on the other side of the routers? Give reasons for your answers.

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