Module Objectives

Upon completing this module, you will be able to use BGP policy controls to influence the BGP route selection process in a network scenario in which you must support connections to multiple ISPs. This ability includes being able to meet these objectives:

■ Describe the function of a transit AS and the need for IBGP

■ Describe the interaction in a transit AS between EBGP and IBGP in relation to relevant attributes

■ Describe the function of an IGP in forwarding packets through an AS

■ Configure an AS to act as a transit backbone in a BGP network

■ Verify proper operation of a configured BGP transit network by performing the steps necessary to correct basic IBGP configuration errors

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

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