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In that sense, the only exterior gateway protocol is BGP, which is a routing protocol we speak out in the Internet. The others there are considered interior gateway protocols and are typically run within the confines of an organizationâs private networks.n the TCP/IP protocol stack, the routed protocol is IP and the routing protocols abound; RIP and EIGRP are examples of that. Now different routing protocols will be more accurate in maintaining the topology information and learning about changes.
BGP may be used for routing within an autonomous system. In this application it is referred to as Interior Border Gateway Protocol, Internal BGP, or iBGP. In contrast, the Internet application of the protocol may be referred to as Exterior Border Gateway Protocol, External BGP, or EBGP. BGP router used only for a network with a single point of entry to the Internet may have a much smaller routing table size (and hence RAM and CPU requirement) than a multihomed network. Even simple multihoming can have modest routing table size.