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An exterior gateway protocol is an IP routing protocol used to exchange routing information between autonomous systems. This exchange is crucial for communications across the Internet. Notable exterior gateway protocols include Exterior Gateway Protocol (EGP), now obsolete, and Border Gateway Protocol (BGP).[1]: 188–189
By contrast, an interior gateway protocol is a type of protocol used for exchanging routing information between gateways (commonly routers) within an autonomous system (for example, a system of corporate local area networks). This routing information can then be used to route network-level protocols like IP.[1]: 178
- ^ a b Hunt, Craig (2002). TCP/IP network administration (3 ed.). O'Reilly Media. ISBN 9781449391430. OCLC 52356435. Archived from the original on 1 July 2020. Retrieved 5 November 2021 – via Dokuz Eylül University.