Alarms

When a device becomes faulty or works abnormally, the device system generates an alarm according to the types of the fault and faulty module. The system stores the alarm to the alarm buffer and generates logs. If a network management system (NMS) is configured, the device system also sends a trap to the NMS through the Simple Network Management Protocol (SNMP). In addition, the system is capable of detecting changes in operation environment. When a requirement for operation conditions cannot be met, the system generates an alarm.

To view alarm information, enable alarm debugging to display alarm information on the terminal. Alarm information is also stored in the alarm buffer, so you can use commands to view all alarms in the alarm buffer.

Alarms are classified into:

• Fault alarms: generated when hardware faults or exceptions of key functions occur.
• Recovery alarms: generated when faulty devices or abnormal functions recover.
• Event alarms: generated when the user needs to be prompted.

Alarms can be viewed in two ways:

• Display alarms on the graphic user interface (GUI) of the NMS.
• Run the display trapbuffer [ size value ] command to view alarms in the alarm buffer. The displayed alarms vary according to the value field. If the actual number of alarms is smaller than the specified number of alarms to be displayed, the actual number of alarms are displayed.