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Chapter 4
Web Configuration & Operation
4.6.1.8.3 RMON Alarm Configuration
RMON Alarm configuration defines specific criteria that will generate response events. It can be set to test data over any
specified time interval and can monitor absolute or changing values. Alarms can also be set to respond to rising or falling
thresholds.
ID:
Indicates the index of the entry. The range is from 1 to 65535.
Interval:
The polling interval for sampling and comparing the rising and falling threshold. The range is from 1to 2^31
seconds.
Variable:
The object number of the MIB variable to be sampled. Only variables of the type ifEntry.n.n may be sampled.
Possible variables are InOctets, InUcastPkts, InNUcastPkts, InDiscards, InErrors, InUnknownProtos, OutOctets,
OutUcastPkts, OutNUcastPkts, OutDiscards, OutErrors, and OutQLen.
Sample Type:
Test for absolute or relative change in the specified variable.
Absolute:
The variable is compared to the thresholds at the end of the sampling period.
Delta:
The last sample is subtracted from the current value and the difference is compared to the thresholds.
Value:
The statistic value during the last sampling period.
Startup Alarm:
Select a method that is used to sample the selected variable and calculate the value to be compared
against the thresholds.
Rising or Falling:
Trigger alarm when the first value is larger than the rising threshold or less than the falling
threshold.
Rising:
Trigger alarm when the first value is larger than the rising threshold.
Falling:
Trigger alarm when the first value is less than the falling threshold.
Rising Threshold:
If the current value is greater than the rising threshold and the last sample value is less than this
threshold, then an alarm will be triggered. After a rising event has been generated, another such event will not be
generated until the sampled value has fallen below the rising threshold, reaches the falling threshold, and again moves
back up to the rising threshold. The threshold range is -2147483647 to 2147483647.
Rising Index:
Indicates the rising index of an event. The range is 1
~
65535.
Falling Threshold:
If the current value is less than the falling threshold, and the last sample value was greater than this
threshold, then an alarm will be generated. After a falling event has been generated, another such event will not be
generated until the sampled value has risen above the falling threshold, reaches the rising threshold, and again moves
back down to the failing threshold. (Range: -2147483647 to 2147483647)
Falling Index:
Indicates the falling index of an event. The range is 1
~
65535.
Click the “Add New Entry” button to insert a new entry to the list.
Click the “Delete” button to remove a newly-inserted entry or select the checkbox to remove a saved entry during the
next save.
Click the “Save” button to save settings or changes.
Click the “Reset” button to restore changed settings to the default settings.
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