Understanding BGP Concepts
BGP currently is in its fourth version, introduced in 1993 and defined in RFC 1771, Border Gateway Protocol 4 (BGP4). BGP is robust and incredibly scalable, with new features constantly being developed and added. It is generally viewed as an exterior routing protocol, and as such it supports loop-free interdomain routing between autonomous systems.
Autonomous Systems
As far as BGP is concerned, an autonomous system is a group of networks under a single technical administration, which implies using the same routing protocols and the same routing policy. There can be multiple Interior Gateway Protocols (IGPs) for internal autonomous system routing and an Exterior Gateway Protocol (EGP), such as BGP, for routing outside ...
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