Status and Statistics
RMON
Cisco 500 Series Stackable Managed Switch Administration Guide 36
2
Alarm counters can be monitored by either absolute values or changes (delta) in
the counter values.
To enter RMON alarms:
STEP 1 Click Status and Statistics > RMON > Alarms. All previously-defined alarms are
displayed. The fields are described in the Add RMON Alarm page below. In
addition to those fields, the following field appears:
• Counter Value—Displays the value of the statistic during the last sampling
period.
STEP 2 Click Add.
STEP 3 Enter the parameters.
• Alarm Entry No.—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.
• Counter Value—Number of occurrences.
• Sample Type—Select the sampling method to generate an alarm. The
options are:
- Absolute—If the threshold is crossed, an alarm is generated.
- Delta—Subtracts the last sampled value from the current value. The
difference in the values is compared to the threshold. If the threshold was
crossed, an alarm is generated.
• Rising Threshold—Enter the value that triggers the rising threshold alarm.
• Rising Event—Select an event to be performed when a rising event is
triggered. Events are created in the Events page.
• Falling Threshold—Enter the value that triggers the falling threshold alarm.
• Falling Event—Select an event to be performed when a falling event is
triggered.
• Startup Alarm—Select the first event from which to start generation of
alarms. Rising is defined by crossing the threshold from a low-value
threshold to a higher-value threshold.
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