在BGP4协议中，当出现故障时采用（ ）报文发送给邻居。
- A.trap
- B.update
- C.keepalive
- D.notification
正确答案及解析
正确答案
解析
BGP的四种报文：open，keepalive，update，notification。
其中OPEN是TCP连接建立后发送的第一个消息，用来建立BGP对等体之间的连接关系并进行参数协商。
BGP会通过相互发送Keepalive的数据来维持邻居关系，默认每60秒发送一次，保持时间为180秒，即到达180秒没有收到邻居的Keepalive，便认为邻居丢失，则断开与邻居的连接。
Update用来在对等体之间交换路由信息，既可以发布可达路由消息，也可以撤销不可达路由消息。
Notification用来通知错误。BGP发言者如果检测到对方发来的消息有错误或主动断开BGP连接，都会发送Notification通知邻居，并关闭连接。
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