Cisco Cisco 2106 Wireless LAN Controller

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. Up to 10 access points can be concurrently upgraded from the controller.

The 5500 series controllers can download the 6.0.188.0 software to 100 access points simultaneously.

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.

In controller software release 5.2 or later, the WLAN override feature has been removed from both the 
controller GUI and CLI. If your controller is configured for WLAN override and you upgrade to 
controller software release 6.0.188.0, the controller deletes the WLAN configuration and broadcasts all 
WLANs. You can specify that only certain WLANs be transmitted by configuring access point groups. 
Each access point advertises only the enabled WLANs that belong to its access point group. Access point 
groups do not enable WLANs to be transmitted on per radio interface of AP.

Y

Y

4

Y

Y

Y

Y

Y

Y

–

Y

Y

4

Y

Y

Y

Y

Y

Y

Y

–

Y

Y

Y

Y

Y

–

Y

Y

Y

Y

Y

Y

–

Y

Y

Y

Y

Y

Y

Y

1.

You can upgrade directly from software release 4.1.190.5 to 4.1.192.35M; however, upgrading to 4.1.191.24M before upgrading to 4.1.192.35M is 
highly recommended.

2.

CUSTOMERS WHO REQUIRE DYNAMIC FREQUENCY SELECTION (DFS) FUNCTIONALITY SHOULD NOT USE THIS RELEASE. This 
release does not provide DFS functionality fixes found in release 4.0.217.204. Additionally, this release is not supported in ETSI-compliant countries 
or Singapore.

3.

Release 4.0.217.204 provides fixes for DFS on 1510 series access points. This functionality is needed only in countries where DFS rules apply.

4.

An upgrade to 4.0.206.0 is not allowed in the following country codes when operating with the following access points: Australia (1505 and 1510), 
Brazil (1505 and 1510), Hong Kong (1505 and 1510), India (1505 and 1510), Japan (1510), Korea (1505 and 1510), Mexico (1505 and 1510), New 
Zealand (1505 and 1510), and Russia (1505 and 1510). Note: The 1505 mesh access point is not supported in release 5.0 and later. The 1510 mesh 
access point is supported only in mesh releases 4.1.190.5, 4.1.191.22M, and 4.1.192.xxM.