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现场所有的手持终端PDA出现随机不定时断网掉线,之后无法自动连接
1、由于是所有手持终端PDA随机不定时出现掉线情况,所以首先怀疑是终端有节电模式相关设置,经过查看手持终端PDA确实有节电模式的设置,所以将节电模式改为普通模式。同时在AP的radio口下配置了option keep-active enable,该命令用来开启缩短客户端休眠时间功能,开启缩短客户端休眠时间功能后,AP通过修改Beacon帧中的TIM,缩短了客户端的休眠时间,从而提高了传输效率。修改后终端掉线频率有所改善,但还是有很多终端仍然存在故障。
2、继续查看设备的配置信息,发现AP的radio口下禁用了低速率,查看终端网卡型号,发现该终端的网卡为型号很老,判断需要低速率支持,所以将禁用低速率的配置删除,修改配置后故障现象发生频率明显降低。
3、通过debug信息发现如下信息:设备收到终端的authentication request ,并且每次都回应authentication response,但是终端仍然会再次发出authentication request ,经过4次请求后,终端仍然没有继续发出关联报文,导致auth超时。
*Jan 11 13:41:23:844 2020 AC-M STAMGR/7/FSM: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Received authentication request in the Unauth state.
*Jan 11 13:41:23:845 2020 AC-M STAMGR/7/Event: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Processed authentication request successfully, and sent authentication response.
*Jan 11 13:41:23:845 2020 AC-M STAMGR/7/Timer: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Created state timer.
*Jan 11 13:41:23:845 2020 AC-M STAMGR/7/FSM: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Changed the client's state from Unauth to Auth.
*Jan 11 13:41:24:841 2020 AC-M STAMGR/7/FSM: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Received authentication request in the Auth state.
*Jan 11 13:41:24:841 2020 AC-M STAMGR/7/Event: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Processed authentication request successfully, and sent authentication response.
*Jan 11 13:41:24:842 2020 AC-M STAMGR/7/Timer: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Refreshed state timer.
*Jan 11 13:41:26:828 2020 AC-M STAMGR/7/FSM: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Received authentication request in the Auth state.
*Jan 11 13:41:26:829 2020 AC-M STAMGR/7/Event: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Processed authentication request successfully, and sent authentication response.
*Jan 11 13:41:26:829 2020 AC-M STAMGR/7/Timer: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Refreshed state timer.
*Jan 11 13:41:33:821 2020 AC-M STAMGR/7/FSM: [APID: 25] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-1151] Received authentication request in the Unauth state.
*Jan 11 13:41:33:822 2020 AC-M STAMGR/7/Event: [APID: 25] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-1151] Processed authentication request successfully, and sent authentication response.
*Jan 11 13:41:33:822 2020 AC-M STAMGR/7/Timer: [APID: 25] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-1151] Created state timer.
*Jan 11 13:41:33:822 2020 AC-M STAMGR/7/FSM: [APID: 25] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-1151] Changed the client's state from Unauth to Auth.
*Jan 11 13:41:36:849 2020 AC-M STAMGR/7/Timer: [APID: 27] [MAC: 0017-23c2-ae2f, BSSID: d461-fe2d-10f1] Auth state timer expired.
根据以上信息,可以看出问题是终端不继续执行关联过程导致,属于终端问题,所以建议现场尝试升级了终端的网卡驱动,升级后故障消失,问题解决。
1、关闭终端的节电模式,通过命令option keep-active enable缩短终端休眠时间;
2、删除禁用低速率的配置;
3、升级终端网卡驱动。
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