BGP - Border Gateway Protocol (1)
Routing involves 2 activities
- optimal path determination ( complex issue)
- transport of packets through network (relatively straightforward)
BGP performs inter-domain routing in TCP/IP networks
BGP is an exterior gateway protocol (performs routing between multiple autonomous systems or domains and exchanges routing information with other BGP systems)
BGP was developed to replace its predecessor: EGP (Exterior Gateway Protocol - a particular instance if an exterior gateway protocol)
RFC 1771, 1654 (obsolete 1105, 1163, 1267)
autonomous system (routing domain) - portion of inter-network under common administrative authority