As of LCOS 10.20 Rel the SSID is still broadcast when using the function "AP standalone operation" in combination with a WLC Tunnel when the WLAN Controller has an outage. Thus short outages like a restart of the WLAN Controller can be attenuated, since the authentication of WLAN devices on access points still persists afterwards.

Data transfer via the WLC Tunnel during a WLAN Controller outage is still not possible when using the function "AP standalone operation"!