What Is Exterior Gateway Protocol (EGP)?

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There was a time when the globe was more straightforward, and the Internet was smaller. It was a duration when people knew their neighbors by name, and it didn't matter if they lived in different countries. Every boday liked everyone and also lived a happy life. There was no trouble in this merry land. This is because there were no borders yet, only autonomous systems. It was the Interior Gateway Protocols that made all of this happen. They were the protocols of choice for data exchange between neighboring gateway hosts in autonomous systems. The most popular protocols were Exterior Gateway Protocol (EGP), frequently used by research institutes, universities, government agencies and private organizations. As the Internet grew bigger and bigger, EGP couldn't keep up with its growth, so it was replaced by Border Gateway Protocol (BGP). EGP is based on periodic message exchange polling for neighbor reachability and poll commands to request update responses. The protocol also includes a simple mechanism for gateways to detect when a neighbor has failed, allowing them to remove the neighbor from their routing tables. EGP is documented in RFC 904, published in April 1984. EGP is also known as External Gateway Protocol. Before the introduction of BGP, Internet hosts used EGP for data table routing exchanges. The EGP routing table included known routers, addresses, cost metrics and each optimal route selection path. The EGP model is built with the finite event, action and transition automation. The EGP model was constructed on finite state machine (FSM) technology. FSM technology is a computer science that uses limited states and events to determine how the system will react to an input or event. It's used to decide which action to take next to complete an operation successfully.

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