The Exterior Gateway Protocol (EGP) is a routing protocol for the Internet originally specified in 1982 by Eric C. Rosen of Bolt, Beranek and Newman, and David L. Mills. It was first described in RFC 827 and formally specified in RFC 904 (1984). EGP is a type of path vector protocol. This article describes routing in computer networks, a method of finding paths from origins to destinations, along which information can be passed. ... 1982 (MCMLXXXII) is a common year starting on Friday of the Gregorian calendar. ... Bolt, Beranek and Newman (now called BBN Technologies) is a high technology company that provides research and development services. ... David L. Mills (born June 3, 1938) was the first head of the Internet Architecture Board. ... 1984 (MCMLXXXIV) is a leap year starting on Sunday of the Gregorian calendar. ... Path Vector Protocol is a computer network routing protocol, sometimes known as a policy routing protocol, that is used to span different autonomous systems. ...
During the early days of the Internet, an Exterior Gateway Protocol, EGP version 3, was used to interconnect autonomous systems. EGP3 should not be confused with EGPs in general. Currently, BGP is the accepted standard for Internet routing and has essentially replaced the more limited EGP3. In the Internet, an autonomous system (AS) is a collection of IP networks and routers, under the control of one or more entities, that presents a common routing policy to the Internet. ... The border gateway protocol (BGP) is one of the core routing protocols in the Internet. ...
Gateways which encounter EGP messages in their message streams which are not addressed to them may discard them.
However, a gateway is required to respond to an NR Poll from a direct neighbor within several seconds (subject to the qualification two paragraphs hence), even if the gateway believes that neighbor to be down.
When the stub declares the core gateways which are direct neighbors to be reachable, it should poll those gateways for NR messages at a rate not to exceed once per minute (or as specified in the Hello messages from the core gateways).
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