Scenario 7-4: Configuring Prefix Lists

In this scenario, you build upon the network in Figure 7-6. You use some handy configuration tips to simulate an ISP environment and use prefix lists on R1 to ensure that you receive only necessary information to save bandwidth and IP and BGP table sizes. This scenario encompasses only two routers to demonstrate the power of BGP. Figure 7-7 displays the two-router topology with the router named ISP1 simulating an ISP environment.

Figure 7-7. Two-Router ISP Simulation

First, configure some routes on ISP1 pointing to Null0 (a bit bucket, commonly used in BGP to advertise routes statically for entries in the ...

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