LevelOne GEL-1061, User Manual

Page: 377 / 500

Chapter 13
| Basic Administration Protocols
Remote Monitoring
– 377 –
Configuring
RMON Alarms
Use the Administration > RMON (Configure Global - Add - Alarm) page to define
specific criteria that will generate response events. Alarms can be set to test data
over any specified time interval, and can monitor absolute or changing values (such
as a statistical counter reaching a specific value, or a statistic changing by a certain
amount over the set interval). Alarms can be set to respond to rising or falling
thresholds. (However, note that after an alarm is triggered it will not be triggered
again until the statistical value crosses the opposite bounding threshold and then
back across the trigger threshold.
Command Usage
◆
If an alarm is already defined for an index, the entry must be deleted before any
changes can be made.
Parameters
These parameters are displayed:
◆
Index – Index to this entry. (Range: 1-65535)
◆
Variable – The object identifier of the MIB variable to be sampled. Only
variables of the type etherStatsEntry.n.n may be sampled.
Note that etherStatsEntry.n uniquely defines the MIB variable, and
etherStatsEntry.n.n defines the MIB variable, plus the etherStatsIndex. For
example, 1.3.6.1.2.1.16.1.1.1.6.1 denotes etherStatsBroadcastPkts, plus the
etherStatsIndex of 1.
◆
Interval – The polling interval. (Range: 1-31622400 seconds)
◆
Sample Type – Tests for absolute or relative changes in the specified variable.
■
Absolute – The variable is compared directly to the thresholds at the end
of the sampling period.
■
Delta – The last sample is subtracted from the current value and the
difference is then compared to the thresholds.
◆
Rising Threshold – If the current value is greater than or equal to the rising
threshold, and the last sample value was less than this threshold, then an alarm
will be generated. 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. (Range: 0-2147483647)
◆
Rising Event Index – The index of the event to use if an alarm is triggered by
monitored variables reaching or crossing above the rising threshold. If there is
no corresponding entry in the event control table, then no event will be
generated. (Range: 0-65535)
◆
Falling Threshold – If the current value is less than or equal to the falling
threshold, and the last sample value was greater than this threshold, then an