Figure 5-2 on page 173 depicts the interaction between Interior and Exterior Gateway Protocols. It shows the Interior Gateway Protocols used to maintain routing information within each AS. The figure also shows the Exterior Gateway Protocols maintaining the routing information between autonomous systems.Within an AS, multiple interior routing processes can be used. When this occurs, the AS must appear to other autonomous systems as having a single coherent interior routing plan. The AS must present a consistent view of the internal destinations.
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