Why is a member switch displayed as unknown or down while the member switch is actually Up

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S series switches (excluding the S1700) in V200R002 and later versions, and V100R006C05 do not support HGMP.
When a member switch in a cluster is Up but displayed as unknown or down, the possible causes and solutions are as follows:
Cause 1: The configuration is not saved after the switch is added to the cluster and reset.
Solution: Add the member switch to the cluster again and save the configurations of the command switch and the member switch.

Cause 2: The command switch re-establishes a cluster but the command for deleting the original cluster is not delivered to the member switch. This is because the member switch is Down when the cluster is deleted or the command switch is reset without saving the configuration. The new cluster name is different from the original one. Another possible cause is that the super password is configured on the member switch using the super password command.
NOTE: S series switches in V200R003 and later versions, and V100R006C05 do not support the super password command.
The super password configured on the command switch is copied to member switches when the cluster is created.
In this case, you cannot add the member by running the command of re-joining the cluster. The message “Candidate device refused�?is displayed.
Solution:
Re-establish a cluster using the original cluster name, add the member switch to the cluster again, and save the configuration.
Specify the super password to add the member switch to the cluster.

Cause 3: The mVLAN configured on the member switch is different from that configured on the command switch.
Solution: Change the mVLAN on the member switch to ensure that the mVLANs of all switches in the cluster are the same.
NOTE: In this case, you cannot add the member by running the command of re-joining the cluster. The message “Candidate device no response�?or no message is displayed.

Other related questions:
Why is displayed radio member traffic information inaccurate
When you display information about all load balancing groups, the radio member traffic information is inaccurate. The possible causes are as follows: 1. Radio frequency does not work up to snuff and upstream and downstream services are abnormal. 2. Check whether the AP reports traffic information at a regular interval of 30s: run the display load-balance-group all command in V200R006 and earlier versions, and the display sta-load-balance static-group command in V200R006 and later versions. 3. Traffic information in the packets reported by the AP is inaccurate. 4. The AC does not receive or correctly process the packets reported by the AP.

How to restart a member CE switch in a stack
-In a stack of CE12800s, run the reset chassis chassis-id command in the user view to restart the specified member switch.
-In a stack of CE8800&7800&6800&5800s, run the reset slot slot-id command in the user view to restart the specified member switch.
Before restarting a member switch, save the stack configuration to ensure that the restarted switch can join the stack normally.

How to add a stack member CE switch
To add a member switch to a stack, perform the following operations: 1. Upgrade the software version of the switch to the current stack system version to prevent multiple restarts resulted from version synchronization and speed up stack setup. 2. Complete the stack configuration of the switch, save the configuration, and then power off the switch. 3. Connect the switch to the stack using stack cables. 4. Power on the switch to enable it to join the stack without affecting the stack.

An S series switch detects that a member on the U2000 is in another cluster
A member device is in another cluster on the U2000. This is because the mVLAN configured on the member device is different from that configured on the command switch. The solution is to change the mVLAN on the member switch to ensure that the mVLANs of all switches in the cluster are the same. Note: S series switches excluding the S1700 in V200R002 and later versions, and V100R006C05 do not support HGMP.

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