Example AS Path Attribute

In the figure, router A in AS 64520 advertises network When that route traverses AS 65500, router C prepends its own AS number to it. When reaches router B, it has two AS numbers attached to it. From the perspective of router B, the path to reach is (65500, 64520).

A similar process applies for the paths to networks and The path from router A to is (65500, 65000), which means traverse AS 65500 and then AS 65000. Router C will have to traverse path (65000) to reach, and path (64520) to reach


Building Scalable Cisco Internetworks (BSCI) v3.0

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