Wireless controller all running differerent versions

[Sheraz.Salim]

HI we have a number of wirelss controllers are are running different version. we also have alsmost 800 ap running.

WLC 1 version 7.4.100

WLC 2 version 7.4.100

WLC 3  version 7.4.110

WLC 4 version 7.4.121

shall we not running same version for example 7.4.121 on all four controllers. please any advise whould be great.

[Leo Laohoo]

7.4???  

Geez, that's a very old firmware. 

At least go to 7.6 engineering release.  But make sure the APs are supported.

[Sheraz.Salim]

Hi thanks for your reply. We are planning to upgrade that is why i wanted to know shall we run same version on all controllers forexample 7.6 or will it be ok with little minor version for example 7.6.1 and 7.6.2

the resason for asking is recently we made a change in 7.4.100 (one of our controller)and some of the ap went down (rebooted). and we beleive as we are running different minor version that is why the ap rebooted.

[George Stefanick]

Here are the latest releases. If the controllers HA to each other you should always have them on the same code rev. What version are you WLCs?

[Prakash Parvathala · Accepted solution]

Here you go with the Software compatibility and wireless solution guide. 

You can make upgrade all your WLCs with respect to the APs supported software versions.

http://www.cisco.com/c/en/us/td/docs/wireless/compatibility/matrix/compatibility-matrix.html