无线控制器下AP随机下线问题

CAPWAP隧道关闭的原因：

   N/A：无

   Failed to create timer：创建定时器失败

   Neighbor dead timer expired：邻居报告定时器超时

   Request wait timer expired：等待请求消息定时器超时

   Data check timer expired：数据检测定时器超时

   Failed to process data channel keep-alive message：处理数据隧道保活报文失败

   Failed to process request：请求报文处理失败

   AP was reset：AP重启

   AP was deleted：AP被删除

   Failed to come online：AP上线失败

   Serial number changed：AP的Serial ID改变

   MAC address changed：AP的MAC地址改变

   Number of APs exceeded the limit：AP数量超出AC能力集

   Processed join request in Run state：在Run状态处理join request

   Failed to create AP context：创建AP上下文信息失败

   Received failure result code：CAPWAP状态机状态变迁时收到错误结果码

   Failed to retransmit message：报文重传失败

   Failed to download image file：下载AP镜像失败

   Image file downloaded successfully：AP下载镜像成功重启系统

   File operation timer expired：文件操作定时器超时

   Failed to add tunnel：添加隧道失败

   Received WTP tunnel down event from AP：AC收到AP的隧道down事件

   Backup AC closed the backup tunnel：备份AC关闭备份隧道

   Master and backup tunnel switchover：主备隧道切换

   Failed to inherit configuration：继承配置失败

   AP authentication failed：AP认证失败