RFC 4271 (Request for Comments 4271)

RFC 4271 defines the Border Gateway Protocol (BGP), which is the main way large networks on the internet share routing information. It helps different networks, or autonomous systems, exchange data about how to reach various destinations efficiently and reliably. BGP ensures that data finds the best path across complex, interconnected networks, playing a critical role in internet stability, scalability, and security. This document provides the technical standards and procedures for implementing BGP, enabling internet providers and large organizations to maintain consistent, accurate routing across the global network.