What is Border Gateway Protocol?
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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