H3C Technologies H3C S7500E Series Switches - Manual (Page 137)

8-3
Event group
The event group defines event indexes and controls the generation and notifications of the
events triggered by the alarms defined in the alarm group and the private alarm group. The
events can be handled in one of the following ways:
z Log: Logging event related information (the occurred events, contents of the event, and so
on) in the event log table of the RMON MIB of the device, and thus the management device
can check the logs through the SNMP Get operation.
z Trap: Sending a trap to notify the occurrence of this event to the network management
station (NMS).
z Log-Trap: Logging event information in the event log table and sending a trap to the NMS.
z None: No action
Alarm group
The RMON alarm group monitors specified alarm variables, such as total number of received
packets (etherStatsPkts) on an interface. After you define an alarm entry the system gets the
value of the monitored alarm variable at the specified interval, when the value of the monitored
variable is greater than or equal to the upper threshold, an upper event is triggered; when the
value of the monitored variable is smaller than or equal to the lower threshold, a lower event is
triggered. The event is then handled as defined in the event group.
If the value of a sampled alarm variable overpasses the same threshold multiple times, only the
first one can cause an alarm event. That is, the rising alarm and falling alarm are alternate.
Private alarm group
The private alarm group calculates the values of alarm variables and compares the result with
the defined threshold, thereby realizing a more comprehensive alarming function.
System handles the prialarm alarm table entry (as defined by the user) in the following ways:
z Periodically samples the prialarm alarm variables defined in the prialarm formula.
z Calculates the sampled values based on the prialarm formula.
z Compares the result with the defined threshold and generates an appropriate event.
If the count result overpasses the same threshold multiple times, only the first one can cause an
alarm event. That is, the rising alarm and falling alarm are alternate.