Connecting to Other Autonomous Systems

Border Gateway Protocol is the only routing protocol in operation today that uses Transmission Control Protocol (TCP) for the reliable movement of its update information. TCP is the connection-oriented protocol defined at the Transport layer of the OSI reference model that provides reliable delivery of data. Routers that are configured with the BGP routing protocol are commonly called BGP speakers. Any two routers that have generated a TCP connection for sharing BGP routing information are called peers, or neighbors. These BGP peers exchange different types of messages to open and maintain the connection. BGP speakers exchange network reachability information in the form of the full paths (BGP AS numbers) ...

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