Border Gateway Protocol (BGP) was developed as a replacement for the EGP described previously. BGP is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP). In contrast to the obsolete EGP, which was used for interior as well as exterior routing, BGP is used only for exterior routing and has additional features compared to EGP. BGP has now become a commonly used exterior routing protocol. The latest version of BGP is BGP Version 4. BGP exchanges network reachability information amongst autonomous systems. The information exchanged also includes a list of autonomous systems that receive the information. This enables the routers to build a graph of the structure of the ...

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