In-dept BGP protocol.

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BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between autonomous systems on the internet.

BGP is an exterior gateway protocol (EGP) that operates on TCP port 179.
It is used to establish and maintain routing information among routers in different autonomous systems (ASes).
BGP uses a path-vector algorithm to determine the best path for routing traffic.
It supports both IPv4 and IPv6 networks.
BGP allows routers to exchange information about network reachability and the path to reach those networks.
It provides scalability, policy control, and redundancy in large-scale networks.
BGP attributes like AS_PATH, NEXT_HOP, and LOCAL_PREF are used to influence routing decisions.
BGP can be used for traffic engineering, load balancing, and implementing security policies.
Examples of BGP implementations include Cisco IOS, Juniper Junos, and Quagga.

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