After alarm messages are cleared, there is no way for the NMS to obtain any information about these cleared messages. Therefore, before deleting alarm messages, be sure that the NMS no longer needs these alarm messages.
In routine maintenance, you can run the following commands to clear alarm messages.
Run clear record device-alarm [ all | slot slot-id ]
Hardware alarms are cleared.
Run system-view
The system view is displayed.
Run alarm
The alarm view is displayed.
Run clear alarm active { all | sequence-number sequence-number }
Active alarms are cleared.