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RFC 1771 defines the current Border Gateway Protocol 4 (BGP-4) implementation. BGP relies on a reliable transport mechanism to establish its connection and for exchanging information between BGP peers. BGP uses TCP port 179 for this purpose and benefits from the TCP protocol to offer reliable communication between BGP speakers . RFC 1771 describes in detail the requirements of BGP neighbor relationships, BGP update format, error notifications, and handling of special cases. Proper BGP functionality requires proper configuration on the routers and correct implementation of the protocol per RFC 1771. The sections that follow address these aspects of BGP:
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