Cisco Cisco 2106 Wireless LAN Controller

Software is factory installed on your controller and automatically downloaded to the access points after 
a release upgrade and whenever an access point joins a controller. As new releases become available for 
the controllers and their access points, consider upgrading.

The Cisco WiSM requires software release SWISMK9-32 or later. The Supervisor 720 12.2(18)SXF2 
supports the Cisco WiSM software release 3.2.78.4 or above, and the Supervisor 720 12.2(18)SXF5 
(Cisco IOS Software Modularity) supports the Cisco WiSM software release 4.0.155.5 (with Cisco IOS 
Software Modularity).

The Cisco WiSM is supported on Cisco 7609 and 7613 Series Routers running only Cisco IOS Release 
12.2(18)SXF5 or later.

The Cisco Wireless LAN Controller Network Module-Enhanced (WLCM-E) is supported on Cisco 
28/37/38xx Series Integrated Services Routers running Cisco IOS Release 12.4(11)T2 or later.

To use the controller in the Catalyst 3750G Wireless LAN Controller Switch, the switch must be running 
Cisco IOS Release 12.2.25.FZ or 12.2(25)SEE.

To find the software release running on your controller, look on the Monitor > Summary page of the 
controller GUI or enter show sysinfo on the controller command line interface (CLI).

When you upgrade the controller’s software, the software on the controller’s associated access points is 
also automatically upgraded. When an access point is loading software, each of its LEDs blinks in 
succession. 

Do not power down the controller or any access point during this process; otherwise, you might corrupt 
the software image! Upgrading a controller with a large number of access points can take as long as 30 
minutes, depending on the size of your network. However, with the increased number of concurrent 
access point upgrades supported in software release 4.0.206.0 and later, the upgrade time should be 
significantly reduced. The access points must remain powered, and the controller must not be reset 
during this time.