这篇随笔主要记录的是Apple设备连接思科无线可能出现的问题,尤其是在思科WLC3504下部署的无线网络,这种故障体现的尤为明显。
1、场景
WLC版本:8.5.131
WLC型号:AIR-CT3504-K9
2、示例
假设在该无线网络下存在多个SSID,如果连接一个,再尝试连接另一个,可能会出现“无法连接该网络”/ "Unable to join the network SSID-name"
如下是一个例子,从RSCCIEW的SSID切换到TEST时出现的问题:
如果收集debug client xx.xx.xx.xx.xx.xx
可能会获取到如下信息:
(WLC1) >*apfMsConnTask_0: Jun 05 13:56:04.571: 54:26:96:3e:4b:ee Association received from mobile on AP 00:22:bd:98:3a:30
*apfMsConnTask_0: Jun 05 13:56:04.572: 54:26:96:3e:4b:ee Deleting client immediately since WLAN has changed
*apfMsConnTask_0: Jun 05 13:56:04.572: 54:26:96:3e:4b:ee Scheduling deletion of Mobile Station: (callerId: 50) in 1 seconds
*apfMsConnTask_0: Jun 05 13:56:04.883: 54:26:96:3e:4b:ee Ignoring 802.11 assoc request from mobile pending deletion
3、解决方法
通过在WLC上开启FAST SSID Change,该功能默认是关闭的。
When fast SSID changing is enabled, the controller allows clients to move between SSIDs. When the client sends a new association for a different SSID, the client entry in the controller connection table is cleared before the client is added to the new SSID. When fast SSID changing is disabled, the controller enforces a delay before clients are allowed to move to a new SSID.
当FAST SSID Change开启是,控制器允许客户端在SSID之间移动,这种情况下是当客户端发送一个新的关联信息到一个不同的SSID时,控制器上的客户端连接条目在该客户端连接到另一个SSID之前就会立即被清除掉。而当FAST SSID Change被关闭时,在客户端移动到一个新的SSID之前WLC会让这个操作延迟。
操作步骤:
3.1 登录WLC的GUI,打开General界面
3.2 在Fast SSID Change下拉框选择enable
3.3 点击apply
3.4 点击Save Configuration保存配置
通过命令行开启:
(WLC1) >config network fast-ssid-change ?
enable/disable] Enable or disables fast SSID changing for mobile stations
(WLC1) >config network fast-ssid-change enable
(WLC1) >save config
Are you sure you want to save? (y/n) y
Configuration Saved!
4、这个问题还可能伴随一个问题,WPA+WPA2 参数的问题。