Handsets that support fast transition only over the distribution system do a full EAP roam. The WLAN offers fast transition only over the air. Phones that support the over-the-air method roam quickly. What should change for the handsets?
Select an answer to reveal the explanation.
Short Explanation
The handsets speak one dialect of the shortcut and the WLAN is advertising the other. Your phones happen to speak the dialect on the air, so they look fine. Offer the method the handsets support, and a faster beacon will not translate it.
Full Explanation
Fast transition comes in an over-the-air method and an over-the-distribution-system method. These handsets support only the distribution-system method, and the WLAN offers only the over-the-air method, so the handsets cannot use the shortcut and they do a full EAP roam. Phones that support the offered method roam quickly, which shows the WLAN's method works for them. Offer the method the handsets support. Hiding the SSID does not convert one method into the other. Disabling data rates does not remove the handshake. The beacon interval does not add a fast-transition method. The handset supports fast transition only over the distribution system, and the WLAN offers it only over the air. The handset falls back to a full roam. Match the mode. Exam caveat: offering a method still requires the client to use it. A handset with fast transition disabled in its own settings will do a full roam on a perfectly matched WLAN. Operational check: match the method, roam a handset, and confirm the second access point does not record a full EAP exchange.