Fast SSID changing is must to be included, this feature in the controller allows clients to move faster between SSIDs.
The 802.11k standard allows clients to request neighbor reports containing information about known neighbor access points that are candidates for a service set transition. This feature can limit the need for active and passive scanning and results in efficient roaming. It is recommended to enable this feature on SSID's supporting clients with 802.11k.
It is recommended to enable the 802.11v to improve the battery life of the client by enabling them to sleep longer. Another enhancement is to enable the WLAN to send requests to associated clients, advising the clients as to better APs to associate to. This is useful for both load balancing and in directing poorly connected clients.
Optimized Roaming feature should be Disabled because Apple, Samsung, and other modern devices use the newer 802.11r, 802.11k, and 802.11v roaming improvements. This setting is Disabled by default
Band select doesnt have anything to do with roaming as this feature is there to steer the clients from 2.4 to 5GHz band.
Addiotinally you can consider enabling 802.11r. 802.11r FT in Adaptive mode will only work for Apple & some Samsung clients while other FT capable clients, which are not Apple or supported samsung devices, will not be able to use the feature. Another way of configuring FT is Mixed Mode. Mix Mode is achieved by Enabling FT and in the “authorization Key Management” section selecting both “PSK” and “FT+PSK”, or “802.1x” and “FT+802.1x”. This will allow all clients to connect to the SSID while FT capable clients will be able to take advantage of this feature, regardless of their manufacturer. FT Mixed Mode may bring issues with some old devices and should therefore be tested before a wide adaption.It is recommended to use the FT over the air for faster roaming, rather than FT over the DS. Please test this is a test bed before enabling it on production.
