Thank you for your kind reply
I found the log message as below:
(CSTWCMS01) (config) #show log user-debug all
Jan 31 14:58:28 :501095: <NOTI> |stm| Assoc request @ 14:58:28.228745: 20:68:9d:3b:f5:3a (SN 3927): AP 10.242.182.102-24:de:c6:81:ec:b0-CSTAPOS02
Jan 31 14:58:28 :501100: <NOTI> |stm| Assoc success @ 14:58:28.235012: 20:68:9d:3b:f5:3a: AP 10.242.182.102-24:de:c6:81:ec:b0-CSTAPOS02
Jan 31 14:58:28 :501065: <DBUG> |stm| Sending STA 20:68:9d:3b:f5:3a message to Auth and Mobility Unicast Encr WPA2 8021X AES Multicast Encr WPA2 8021X AES VLAN 0x1e, wmm:1, rsn_cap:28
Jan 31 14:58:28 :522035: <INFO> |authmgr| MAC=20:68:9d:3b:f5:3a Station UP: BSSID=24:de:c6:81:ec:b0 ESSID=CSTY5X VLAN=30 AP-name=CSTAPOS02
Jan 30 22:50:28 :500511: <DBUG> |mobileip| Station 20:68:9d:3b:f5:3a, 0.0.0.0: Received association on ESSID: CSTY5X Mobility service ON, HA Discovery on Association Off, Fastroaming Disabled, AP: Name CSTAPOS02 Group VAP_1 BSSID 24:de:c6:81:ec:b0, phy g, VLAN 30
Jan 31 14:58:28 :500010: <NOTI> |mobileip| Station 20:68:9d:3b:f5:3a, 0.0.0.0: Mobility trail, on switch 10.242.182.3, VLAN 30, AP CSTAPOS02, CSTY5X/24:de:c6:81:ec:b0/g
Would you please kindly have a look on it ?
Many thanks
Simon