Mobility Express部署外部镜像服务器

1、当我们部署完ME的时候，发现有一些AP虽然显示已经加入了WLC（ME），但是它其实并没有正常的工作，显示不可用：

(Cisco Controller) >show ap su

Number of APs.................................... 2

Global AP User Name.............................. Not Configured
Global AP Dot1x User Name........................ Not Configured

* prefix indicates Cisco Internal AP

AP Name                         Slots  AP Model              Ethernet MAC       Location              Country     IP Address       Clients  DSE Location  
------------------------------  -----  --------------------  -----------------  --------------------  ----------  ---------------  -------  --------------
*BJSL-1240680-AP1                2      AIR-AP1852I-H-K9       18:8b:45:0a:03:00  default location      CN          192.168.111.11   0        [0 ,0 ,0 ]
AP1                             2      AIR-CAP1702I-H-K9      88:1d:fc:3a:b2:14  default location                  192.168.111.10   0        [0 ,0 ,0 ]

(Cisco Controller) >show ap join stats summary all

Number of APs.............................................. 2

Base Mac             AP EthernetMac       AP Name                 IP Address         Status
18:8b:45:0a:74:c0    18:8b:45:0a:03:00    BJSL-1240680-AP1        192.168.111.11     Joined    
a0:ec:f9:50:a7:30    a0:ec:f9:50:a7:30    AP1                     192.168.111.10     Joined

这个时候，我们需要部署一个外部的server以供在线的设备去升级对应的版本，以加入ME正常工作：

如上配置信息Save之后，对应的设备将会自动从TFTP server下载需要的镜像。

对应的AP更换完成后，会重新加入WLC：

(Cisco Controller) >show ap summary

Number of APs.................................... 2

Global AP User Name.............................. Not Configured
Global AP Dot1x User Name........................ Not Configured

* prefix indicates Cisco Internal AP

AP Name                         Slots  AP Model              Ethernet MAC       Location              Country     IP Address       Clients  DSE Location  
------------------------------  -----  --------------------  -----------------  --------------------  ----------  ---------------  -------  --------------
*BJSL-1240680-AP1                2      AIR-AP1852I-H-K9       18:8b:45:0a:03:00  default location      CN          192.168.111.11   0        [0 ,0 ,0 ]
AP1                             2      AIR-CAP1702I-H-K9      88:1d:fc:3a:b2:14  default location      CN          192.168.111.10   0        [0 ,0 ,0 ]

此时就可以正常使用了。