What exactly is the difference between PKC and OKC?
Seems to be a lot of confusion out there. What are the cold hard facts?
The WLC FAQ says
"PKC is a feature enabled in Cisco 2006/410x/440x ..."
The Debug Guide says
"The WLC only supports OKC..."
Wireless LAN Controller (WLC) Design and Features FAQ
Q. What is PKC and how does it work with the Wireless LAN Controller (WLC)?
A. PKC stands for Proactive Key Caching. It was designed as an extension to the 802.11i IEEE standard. PKC is a feature enabled in Cisco 2006/410x/440x Series Controllers which permits properly equipped wireless clients to roam without full re-authentication with an AAA server.
WLC Debug and Show Commands
PMKID Caching Fails
Check if the client supports opportunistic key cache (OKC).
Note: OKC is not the same as proactive key cache (PKC) as specified in 802.11I. The WLC only supports OKC.