wx3520H STAMGR/6/STAMGR_CLIENT_SNOOPING日志咨询问题

某局点Portal认证出现异常掉线问题，异常掉线时间点在AC上出现如下日志，这个日志记录了终端的哪些行为，是否会导致终端Portal异常下线

%Aug 23 17:54:29:538 2018 DaHua_Branch_Master_AC DOT1X/6/DOT1X_WLAN_LOGIN_SUCC: -Username=37643-UserMAC=14ab-c562-854a-BSSID=600b-0311-63c1-SSID=dahuavip-VLANID=220; A user passed 802.1X authentication and came online. //终端1x认证成功

%Aug 23 17:54:29:931 2018 DaHua_Branch_Master_AC STAMGR/6/STAMGR_CLIENT_ONLINE: Client 14ab-c562-854a went online from BSS 600b-0311-63c1 with SSID dahuavip on AP nanjing_ap1. State changed to Run. //终端上线

%Aug 23 17:54:30:743 2018 DaHua_Branch_Master_AC STAMGR/6/STAMGR_CLIENT_SNOOPING: Detected client IP change: Client MAC: 14ab-c562-854a, IP: 172.18.62.20, -NA-, -NA-, -NA-, Username: 37643,  AP name: nanjing_ap1, Radio ID: 1, Channel number: 36, SSID: dahuavip, BSSID: 600b-0311-63c1.//这个日志表示什么意思？地址改变了？

%Aug 23 17:54:34:690 2018 DaHua_Branch_Master_AC STAMGR/6/STAMGR_CLIENT_SNOOPING: Detected client IP change: Client MAC: 14ab-c562-854a, IP: 172.18.62.20, -NA-, -NA-, -NA-, Username: 37643,  AP name: nanjing_ap1, Radio ID: 1, Channel number: 36, SSID: dahuavip, BSSID: 600b-0311-63c1.