If fixed user names are configured in the VLANIF interface view, Eth-Trunk interface view or port group view, the password must be set.
If a MAC address is configured as the user name in the port group view, the password cannot be set.
If configured in the system view, the user name format is valid for commands on all interfaces; if configured in the interface view, the user name format is valid for commands on this interface only. If configured in the interface view and system view at the same time, the user name format configured in the interface view has higher priority.