HP FlexNetwork NJ5000, User Manual

Page: 82 / 475

70
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:
•
Log
—Logs event information (including event time and description) in the event log table so the
management device can get the logs through SNMP.
•
Trap
—Sends an SNMP notification when the event occurs.
•
Log-Trap
—Logs event information in the event log table and sends an SNMP notification when
the event occurs.
•
None
—No action.
Alarm group
The RMON alarm group monitors alarm variables, such as the count of incoming 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. If the value of the monitored variable is greater
than or equal to the rising threshold, a rising event is triggered. If the value of the monitored variable
is smaller than or equal to the falling threshold, a falling event is triggered. The event is then handled
as defined in the event group.
If an alarm entry crosses a threshold multiple times in succession, the RMON agent generates an
alarm event only for the first crossing. For example, if the value of a sampled alarm variable crosses
the rising threshold multiple times before it crosses the falling threshold, only the first crossing
triggers a rising alarm event, as shown in
Figure 62 .
Figure 62 Rising and falling alarm events
RMON configuration task list
Configuring the RMON statistics function
The RMON statistics function can be implemented by either the Ethernet statistics group or the
history group, but the objects of the statistics are different, as follows:
•
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. Perform the tasks in
Table 26 to configure RMON Ethernet
statistics function.