3Com S7902E, Configuration Manual

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Trap: Sending a trap to notify the occurrence of this event to the network management station
(NMS).
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Log-Trap: Logging event information in the event log table and sending a trap to the NMS.
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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:
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Periodically samples the prialarm alarm variables defined in the prialarm formula.
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Calculates the sampled values based on the prialarm formula.
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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.
Configuring the RMON Statistics Function
RMON statistics function can be implemented by either the Ethernet statistics group or the history group,
but the objects of the statistics are different, you can choose to configure a statistics group or a history
group accordingly.
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A statistics object of the Ethernet statistics group is a variable defined in the Ethernet statistics
table, and the recorded content is a cumulative sum of the variable from the time the statistics entry
is created to the current time. For detailed configuration, refer to Configuring the RMON Ethernet
Statistics Function .