H3C Technologies H3C S5120 Series Switches - Manual (Page 593)

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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.
History group
The history group defines that the system periodically collects statistics on traffic information at an
interface and saves the statistics in the history record table (ethernetHistoryTable) for query
convenience of the management device. The statistics data includes bandwidth utilization, number of
error packets, and total number of packets.
A history group collects statistics on packets received on the interface during each period, which can be
configured through the command line interface (CLI).
Ethernet statistics group
The statistics group defines that the system collects statistics on various traffic information on an
interface (at present, only Ethernet interfaces are supported) and saves the statistics in the Ethernet
statistics table (ethernetStatsTable) for query convenience of the management device. It provides
statistics about network collisions, CRC alignment errors, undersize/oversize packets, broadcasts,
multicasts, bytes received, packets received, and so on.
After the creation of a statistics entry on an interface, the statistics group starts to collect traffic statistics
on the interface. The result of the statistics is a cumulative sum.
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.