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  A Quick Introduction to BGP BGP, or Border Gateway Protocol, was created in the late 1980s by the Internet Engineering Task Force as a replacement for Interior Gateway Protocol (IGP) and Exterior Gateway Protocol (EGP). Its purpose is to connect different autonomous systems on the Internet. The first version, BGP-1, was defined in 1989 in a document called RFC 1105. The current version, BGP-4, was defined in 1995 in another document called RFC 1771. BGP and IPv4 & IPv6 BGP, or Border Gateway Protocol, is responsible for distributing routing information for both IPv4 and IPv6 addresses. It is an exterior gateway protocol, which means that it is used to exchange routing information between different Autonomous Systems (ASes) and not within a single AS. BGP has two versions: iBGP (Internal BGP) for routers within the same AS and eBGP (External BGP) for routers in different ASes. eBGP is generally used between network Providers so that they can share or advertise routes between e...