Draytek VigorAP 910C User Manual page 189

Fast Roaming
(WPA/802.1x)
After finishing this web page configuration, please click OK to save the settings.
the wireless station can connect to the adjacent AP (with better
RSSI).

With Adjacent AP RSSI over – Specify a value as a
threshold.
Enable – Check the box to enable fast roaming configuration.
PMK Cache Period - Set the expire time of WPA2 PMK
(Pairwise master key) cache. PMK Cache manages the list from
the BSSIDs in the associated SSID with which it has
pre-authenticated. Such feature is available for WPA2/802.1
mode.
Pre-Authentication - Enables a station to authenticate to
multiple APs for roaming securer and faster. With the
pre-authentication procedure defined in IEEE 802.11i
specification, the pre-four-way-handshake can reduce handoff
delay perceivable by a mobile node. It makes roaming faster and
more secure. (Only valid in WPA2)
Enable - Enable IEEE 802.1X Pre-Authentication.
Disable - Disable IEEE 802.1X Pre-Authentication.
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VigorAP 910C User's Guide