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Old one is EGP
and new what is use is BGP.
BGP is mostly use as a exterior gateway protocol
Interior Gateway Protocol (IGP) and Exterior Gateway Protocol (EGP)
They categorize routeing protocols in which area they function
Interior Gateway Protocols : they used to exchange routeing information between gateways "Routers" within an autonomous system "AS" ex. a corporate local area network, the kind of protocols falls down to this category is OSPF, RIP, IS-IS.
Exterior Gateway Protocols : they used to exchange routing information between autonomous systems they rely on IGP protocols to get route information with an AS, the kind of protocols falls down to this category is EGP, BGP.
A routing protocol with different Autonomous System is called an Exterior Gateway Protocol.
BGP is an example of this type of protocol.
TCP/IP
Exterior Gateway Protocol (EGP) is a protocol for exchanging routing information between two neighbor gateway hosts (each with its own router) in a network of autonomous systems. EGP is commonly used between hosts on the Internet to exchange routing table information.
