WLC 5760 and 802.11r/CCKM support

Question

Experts;
I have a couple of 5760 controllers running as MC/MA and I am planning to enable Layer 3 roaming between the two 5760 MC/MA controllers. On a 5508 controller running Air-IOS there is an option, "fast transition", for devices that support 802.11r, my understanding if a device doesn't support 802.11r "fast transition" should not be checked. 
I like to know if there is a similar command or option for 802.11r support on a 5760 controller and if the only configuration option to establish mobility between the 5760 controllers is that both controllers need to be in the same mobility group.
Thanks;
Juan

Answer 1

Hi Juan,
my understanding if a device doesn't support 802.11r "fast transition" should not be checked
This is because certain clients that does not support 802.11r (like Mac OSX) won't like when SSID advertising 802.1X & 802.r FT (802.11r mixed mode) on the same SSID. Therefore they will not associate to that SSID. See this post as it listed 802.11r supported & unsupported devices/OS.
https://supportforums.cisco.com/discussion/12314591/8021r-and-fast-roaming
You need to have IOS-XE 3.6 onward to support 802.11r mix mode. (7.6 or 8.0 for AireOS codes)
Regarding config you will find that options (enabling & Over the DS tick box) under SSID  configuration (refer link provided by Daniel). If you want to go more into detail how these different options work please read below, I have used 3850 in these post, but config should be same for a 5760.
1. http://mrncciew.com/2014/09/06/cwsp-802-11r-ft-association/
2. http://mrncciew.com/2014/09/08/cwsp-802-11r-over-the-ds-ft/
3. http://mrncciew.com/2014/09/07/cwsp-802-11r-over-the-air-ft/
In your case both 5760 should be in same mobility group in order to MDID to be same which is required for 802.11r fast roaming.
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HTH
Rasika