BGP

At its core, BGP is about establishing and maintaining peering relationships between routers. Before any routing information is exchanged, both routers must progress through a defined sequence of connection states, managed by the BGP state machine.

The Internet, in its magnificent global sprawl, is fundamentally a network of networks. Unlike the neatly contained domains governed by Interior Gateway Protocols (IGPs) such as OSPF or EIGRP, the vast inter-domain landscape requires a routing protocol designed for entirely different challenges. Enter the Border Gateway Protocol (BGP)—the undisputed