• BGP has the right set of functions to support the various interdomain routing policies. Contrary to BGP, interior routing protocols focus only on finding the optimum (usually fastest) route between two points, without respect to routing policies.

• BGP is an enhanced distance vector protocol with reliable transport provided by TCP, a rich set of metrics called BGP path attributes, and scalability features such as batched updates that make it suitable for very large networks.

• Customers that plan to connect to more than one ISP, and small ISPs that plan to have multiple Internet connections in the future, usually use BGP with their service provider.

1-18 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.

Lesson 2

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