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Definition: EGP

(1) (Exterior Gateway Protocol) A broad category of routing protocols that are designed to span different autonomous systems. Contrast with IGP.

(2) (Exterior Gateway Protocol) The original exterior gateway routing protocol (see above), which was widely used in the U.S. Data Defense Network (DDN) and National Science Foundation Network (NSFNet). EGP was a distance vector protocol that used polling to retrieve routing information. EGP was superseded by BGP. See BGP and routing protocol.