Border gateway protocol (BGP) is a kind of routing protocol which is widely used in inter-domain connection. its main function is exchange the reachable information between autonomy systems.

• 摘要边界网关协议(BGP)属外部网关协议，是高性能核心路由器上必须运行的一种路由协议，它主要应用于各主干网所在自治域系统之间的互联。