Example BGP Using Loopback Addresses

6-44 Building Scalable Cisco Internetworks (BSCI) v3.0

The neighbor update-source command should be used on both routers. If router B points to loopback address of router C, and router C points at loopback address of router B, and neither uses the neighbor update-source command, the BGP session between these routers will not start.

Router B would send a BGP open packet to router C with the source IP address being either or Router C would review the source IP address and attempt to match it against its list of known neighbors. Router C would not find a match and would not respond to the open message from router B.

© 2006 Cisco Systems, Inc. Implementing BGP 6-45

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