Configuring a Border Gateway Protocol (BGP) network in a transit services configuration requires special care to ensure consistency of routing information throughout the autonomous system (AS). Understanding the interaction between External Border Gateway Protocol (EBGP) and Internal Border Gateway Protocol (IBGP) is crucial to successfully configuring and troubleshooting the transit autonomous network.

This lesson introduces the requirements of IBGP and describes how routers residing in the transit AS process the next-hop attribute. Changes to the normal processing of the next-hop attribute are also described in this lesson. The lesson concludes with a comparison between EBGP and IBGP.

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