In the figure, AS 65000 and AS 64900 send all routes into AS 64500. The ISP that a specific router within AS 64500 uses to reach the external networks is determined by the BGP protocol.
The routers in AS 64500 can be configured to influence the path to certain networks. For example, router A and router B can influence the outbound traffic from AS 64500.
6-12 Building Scalable Cisco Internetworks (BSCI) v3.0
© 2006 Cisco Systems, Inc.
BGP Routing Between Autonomous Systems
This topic describes how BGP routes between autonomous systems.
BGP Autonomous Systems
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