Border Gateway Protocol (BGP) is an example of an External Gateway Protocol (EGP).BGP exchanges routing information between autonomous systems while guaranteeing loop-free path selection.

• 边界闸道协定(BGP)是外部闸道协定(EGP)的一个例子，BGP在自主系统间交换路由资讯，保证选择的路径是无迴圈的。