Border Gateway Protocol
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it makes routing decisions based on paths, network policies, or rule-sets configured by a network administrator.
| Communication protocol | |
BGP state machine | |
| Abbreviation | BGP |
|---|---|
| Purpose | exchange Internet Protocol routing information |
| Introduction | June 1, 1989 |
| Based on | EGP |
| OSI layer | Application layer |
| Port(s) | tcp/179 |
| RFC(s) | § Standards documents |
| Internet protocol suite |
|---|
| Application layer |
| Transport layer |
| Internet layer |
| Link layer |
BGP used for routing within an autonomous system is called Interior Border Gateway Protocol (IBGP). In contrast, the Internet application of the protocol is called Exterior Border Gateway Protocol (EBGP).
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