Border Gateway Protocol
![BGP state machine](/Images/godic/202501/19/BGP_FSM.svg1151.png")
![BGP table growth on the Internet](/Images/godic/202501/19/BGP_Table_growth.svg1151.png")
![Number of AS on the Internet vs number of registered AS](/Images/godic/202501/19/Internet_AS.svg1151.png")
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. The protocol is often classified as a path vector protocol but is sometimes also classed as a distance-vector routing protocol. The Border Gateway Protocol makes routing decisions based on paths, network policies, or rule-sets configured by a network administrator and is involved in making core routing decisions.