bgp keepalive

BGP中的Keepalive是一种定期发送的报文，用于维持BGP邻居关系。如果收到正确的Update或Keepalive报文，BGP就认为对端处于正常运行状态，并保持BGP连接。Keepalive报文的格式只包含报文头，没有附加其他任何字段。该报文的目的是确保BGP会话的连通性，并及时检测到邻居的异常情况。如果收到错误的Update或Keepalive报文，BGP将发送Notification报文通知对端，并转至Idle状态。而Route-refresh报文不会改变BGP状态。如果收到Notification报文，BGP会转至Idle状态。另外，如果收到TCP拆链通知，BGP会断开连接并转至Idle状态。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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