BGP performs interdomain routing in Transmission Control Protocol/Internet Protocol (TCP/IP) networks. BGP is an Exterior Gateway Protocol (EGP), which means that it performs routing between multiple autonomous systems and exchanges routing and reachability information with other BGP systems.

BGP was developed to replace its predecessor, the now obsolete EGP, as the standard exterior gateway routing protocol used in the global Internet. BGP solves serious problems with EGP and scales to Internet growth more efficiently.

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