Viewing Statistics
Managing RMON Statistics
Cisco Small Business 300 Series Managed Switch Administration Guide 22
2
Defining RMON Alarms
RMON alarms provide a mechanism for setting thresholds and sampling intervals
to generate exception events on any RMON counters or any other SNMP object
counter maintained by the agent. Both the rising and falling thresholds must be
configured in the alarm. After a rising threshold is crossed, another rising event is
not generated until the companion falling threshold is crossed. After a falling alarm
is issued, the next alarm is issued when a rising threshold is crossed.
One or more alarms are bound to an event. The event indicates the action to be
taken when the alarm occurs.
The Alarms Page
provides the ability to configure alarms and to bind them with
events. Alarm counters can be monitored by either absolute values or changes
(delta) in the counter values.
To enter RMON alarms:
STEP 1 Click RMON > Alarms. The Alarms Page
opens.
STEP 2 Click Add. The Add RMON Alarm Page opens.
STEP 3 Enter the parameters.
• Alarm Entry—Displays the alarm entry number.
• Interface—Select the type of interface for which RMON statistics are
displayed.
• Counter Name—Select the MIB variable that indicates the type of
occurrence measured.
• Sample Type—Select the sampling method to generate an alarm. The
options are:
- Delta—Subtracts the last sampled value from the current value. The
difference in the values is compared to the threshold. If the threshold was
passed, an alarm is generated.
- Absolute—If the threshold is passed, an alarm is generated.
• Rising Threshold—Enter the rising counter value that triggers the rising
threshold alarm.
• Rising Event—Select an event, from those that you defined in the Events
table, to be performed when a rising event is triggered.
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