Border Gateway Protocol (BGP) is a standardized protocol designed to
transfer data and information between different host gateways, and over
autonomous systems on the Internet. BGP is a Path Vector Protocol (PVP), which
maintains paths to different hosts, networks and gateway routers and determines
its routing decisions based on it. It does not use Interior Gateway Protocol
(IGP) metrics for routing decisions, but only decides the route based on path,
network policies and rule sets.
·BGP is used for routing within an AS. It is then referred to as
Interior Border Gateway Protocol,
Internal BGP, or iBGP. Similarly when used in Internet applications, the
protocol may be referred to as Exterior Border Gateway Protocol, External BGP,
or EBGP. Majority of Internet service providers must use BGP to establish
routing between one another.
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