Getting 802.11r Fast Transition working with WPA(2)-Enterprise is quite painful. There is information on the forums, but things have changed quite a bit during the last few years. These are notes mostly for my own benefit.
Tricky bits as of OpenWRT 23.05 (in Luci "WLAN roaming" tab of wireless network settings):
- NAS Id should be set to something unique, like the name of the AP.
- Mobility domain defaults to a sane value. Leave it empty.
- Reassociation deadline's default of 1000 is bad. Apparently Cisco uses 20000 here, setting that appears to be helpful.
- FT Protocol "Over the air" is the good setting.
If you're using WPA2-PSK, check "Generate PMK locally" and you're done. Save&apply and it should just work.