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The ARF file can also be customized with a standard text editor. You may wish to include graphs
of humidity sensors or switches. In addition, any sensor status can be visually graphed.
Polling SNMP, Thresholds, and Alarm
NNM can read the Status field to determine if any of the sensors have a problem. Polling is the
most effective method of monitoring network connectivity failures. While the securityProbe does
send traps there is no guarantee that a trap will be delivered to the monitoring station.
The network traffic generated by polling is very limited. The temperature sensor only needs to be
read once every five minutes or more. This will depend on your current requirements.
Setting Up Polling
To setup polling go to the NNM toolbar and click Options > Data Collection & Thresholds:
SNMP
The dialog box appears. Click Edit > MIB Object > New
The dialog to pick the OID to monitor appears. Click on the + to expand the private tree. Then
expand enterprises > AKCP > securityProbe. This exposes the securityProbe MIB.
You can monitor the status of an individual sensor by choosing the status OID for that sensor.
For example, sensorProbeTempStatus is for the status of temperature sensor.
A second dialog appears allowing you to further refine the details of what you wish to poll. On the
"Set Collection Mode", select "Store, Check Thresholds". Enter the IP Address of the
securityProbe in the Source field. Press Add to add that data source to the list of nodes to be
monitored.
Next, you can change the polling interval. For now, we will enter 5 seconds. This will cause the
node to be polled every 5 seconds. This is too often for a working environment. However, it will
help to test the securityProbe if we poll more often. Once testing is complete, we can set the
polling to a larger interval.
Set the Threshold Parameters to >= 3. This means that we will cause an alarm to be triggered
whenever the status is greater than or equal to 3. When the status is equal to 3 this means that
the status of one of the sensors is at warning.
Set the Rearm value to < 3. When the status is at 2, the sensors are at or below normal status.
When the status is at 1, the sensors status is noStatus. The noStatus status is set when the
sensor is set to offline.
Set the Consecutive Samples to 1 for both the Threshold and The Rearm sections. Set the
Rearm Value Type to Absolute. Press OK to add this MIB Object to the collection list and return
to the main dialog.
In order for this new collection to become effective, you must save it. From the dialog menu, click
File > Save. You are now polling the sensor Status
Polling using RO (read only) and RW (read-write) communities. Follow the example below.