Cisco Cisco 4402 Wireless LAN Controller

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

The Cisco WiSM requires software release SWISMK9-32 or later.

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

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 a controller is upgraded, the code on its associated access points is also automatically upgraded. 
When an access point is loading code, each of its lights 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. The access points must remain powered, and the controller must not be reset during this time.

Cisco recommends the following sequence when performing an upgrade:

Upload your controller configuration files to a server to back them up.

Turn off the controller 802.11a and 802.11b networks.

Upgrade your controller to software release 4.0.179.8, following the instructions in the Cisco 
Wireless LAN Controller Configuration Guide, Release 4.0. Click this link to browse to that 
document: 

Re-enable your 802.11a and 802.11b networks.