Примечания к выпуску для Cisco Cisco 2106 Wireless LAN Controller

Controllers can be upgraded from one release to another. However, should you require a downgrade from 
one release to another, you may be unable to use the higher release configuration. The workaround is to 
reload the previous controller configuration files saved on the backup server or to reconfigure the 
controller.

Details for upgrading your network to release 4.0.217.204 from earlier releases of 3.1, 3.2 and 4.0 are 
described below

:

If your controller is installed with release 4.0.xx or 3.2.xx, you can upgrade directly to release 
4.0.217.204.

If your controller is installed with release 3.1.x, you must upgrade with one intermediate release 
prior to installing release 4.0.217.204. 

First, upgrade to 3.2.195.10

Secondly, upgrade to 4.0.217.204.

If you are operating with indoor and outdoor access points in your network in Europe, Singapore 
and other countries requiring Dynamic Frequency Selection (DFS) functionality, you should install 
release 4.0.217.204.

For the US and other countries that do not require DFS functionality:

Install 4.1.190.5 for outdoor mesh networks operating with Cisco Aironet 1500 (1505 and 1510) 
and 1520 series access points (1522).

If you are operating with indoor and outdoor access points (1505, 1510, and 1522), you will 
need to place all mesh traffic on a controller running release 4.1.190.5 and all indoor access 
points on a controller running release 4.1.185.0 or earlier 4.1.x version. Refer to the release 
notes for 4.1.190.5 and 4.1.185.0 at the following link for details on these releases: 

If you are operating with indoor and outdoor access points excluding 1522, you can operate with 
either release 4.1.185.0 or 4.1.190.5. (In the case of release 4.1.190.5, you must maintain 
separate controllers for indoor and outdoor access points as noted above.)

If you are operating with indoor access points only, you should install the latest non-mesh 
controller release such as 4.1.185.0.