Hello,
Please do some test with following recommendations:
1) try to use the access control on an interface to be based on MAC addresses. In your case, when the port method is used, all the other 802.1X users on an interface can use network resources as long as one user is authenticated successfully. When the authenticated user goes offline, other users cannot use network resources. The port method is applicable to group users.
When the mac method is used, all 802.1X users on an interface are authenticated one by one. If a user goes offline, other users on this interface are not affected. The mac method is applicable to individual users.
<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] dot1x port-method mac
2)specify the user gateway IP address and its corresponding MAC address as the source IP address and source MAC address of offline detection packets. You can find them with 'display interface' command.
<HUAWEI> system-view
[HUAWEI] access-user arp-detect vlan 10 ip-address 192.168.1.1 mac-address 2222-1111-1234