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802.11r, which is the IEEE standard for fast roaming, introduces a new concept of roaming where the initial handshake with the new AP is done even before the client roams to the target AP, which is called Fast Transition (FT). The initial handshake allows the client and APs to do the Pairwise Transient Key (PTK) calculation in advance. These PTK keys are applied to the client and AP after the client does the re-association request or response exchange with the new target AP. The FT key hierarchy is designed to allow clients to make fast BSS transitions between APs without requiring re-authentication at every AP. 802.11r eliminates much of the handshaking overhead while roaming, thus reducing the handoff times between APs while providing security and QoS. This is useful for client devices that have delay-sensitive applications such as voice and video and is the key requirement for voice over Wi-Fi.
This chapter includes the following topics:
security ft [ over-the-ds | reassociation-timeout timeout-in-seconds] Example: Controller(config-wlan)# security ft reassociation-timeout 23 |
Controller(config-wlan)#security wpa akm ft ? dot1x Configures 802.1x support psk Configures PSK support
show wlan name wlan-name |
Displays the WLAN parameters on the WLAN. The FT parameters are displayed. Example: FT Support :Enabled FT Reassociation Timeout :10 FT Over-The-DS mode :Enabled |
Controller#debug dot11 dot11r ? all all events 802.11r event keys 802.11r keys
Controller#set trace dot11 dot11r ? event 802.11r event debugging filter Trace Adapted Flag Filter keys 802.11r keys debugging level Trace Level