Opportunistic key caching delegates the management of the WLAN client keys to a WLAN controller, or to a central switch, which manages all of the access points in the network. If a client logs on to an access point, the WLAN controller behind it works as an authenticator to manage the keys and send the PMK to the access point, which is ultimately received by the client. If the client moves to another cell, it uses this PMK and the MAC address of the new access point to calculate a PMKID. It then send this to the new access point in the hope that OKC is enabled there (therefore "opportunistic"). If the access point cannot handle the PMKID, then it negotiates an 802.11X authentication with the client in the usual manner.
A LANCOM access point can even perform OKC if the WLAN controller is temporarily unavailable. In this case, it stores the PMK and sends this to the WLAN controller when it becomes available again. Ultimately it sends the PMK to all of the access points in the network, which allows clients to use OKC to login after a change of radio cell.
This setting enables OKC on the access point that is being managed by the WLAN controller.
- Telnet path:
- Possible values:
- Yes
- No
- Default:
- Yes