Complete Protocol dictionary, glossary and reference
BGP-4: Border Gateway Protocol version 4
The Border Gateway Protocol (BGP) is the routing protocol used to exchange routing information across networks. BGP runs over TCP and is an inter-Autonomous System routing protocol. Border Gateway Protocol version 4 (BGP-4), the current version of BGP, provides a set of mechanisms for supporting Classless Inter-Domain Routing (CIDR). These mechanisms include support for advertising a set of destinations as an IP prefix and eliminating the concept of network "class" within BGP. BGP-4 also introduces mechanisms which allow aggregation of routes, including aggregation of AS paths.