Border Gateway Protocol is a Path Vector protocol that is primarily used to exchange Network Layer Reachability Information between routing domains or autonomous systems. In other words, BGP is used as an inter-domain or inter-autonomous system protocol. NLRI is exchanged between BGP routers, referred to as BGP speakers, using UPDATE messages. The NLRI is composed of a prefix and a length. The prefix refers to the network address for that subnet and the length specifies the number of network bits and is simply a network mask in CIDR notation while. Some NLRI examples include 10.0.0.0 . . .
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