SNMP Monitor
The SNMP Monitor works as an SNMP Manager--it can query local or remote SNMP agents for specific values, and then compare those values to thresholds. If the thresholds are passed, actions are fired. In addition, the retrieved values are also stored in the database for creating reports.
Configuring the SNMP Monitor is very simple. When the monitor dialog above comes up, you need to choose the SNMP version of the remote agent (v1, v2c and v3 are supported). If using v3 and a username/password, that information also needs to be entered. The default configuration comes up with a community string of 'public' and v2c as the version. This works in many, many cases.
Once you have entered the information that will allow access to your SNMP agent, press the Add button. That will display the dialog shown below. The SNMP monitor will query the remote agent and show you a list of all SNMP objects available from the agent. Those objects are also displayed using information from default MIBs that are on your system. If you have additional MIB files for objects that you want to view, press Load MIB button to select the MIB file. The display will update to include information from the newly loaded MIB file.
As you move through the SNMP object tree, you'll see that the information at the bottom of the dialog changes. This bottom part of the dialog gives you information about each object according to any applicable MIB that was loaded. In addition, you can press the Recent Value button to see what the value is at that moment. You can navigate to the object that you're interested in, or use the Find button to find an object. The Find button will search for OIDs, object names and object values. You can press the Find button again after a search to keep searching further for the same value.
Once your target object has been found, press the green Monitor Selected Object button. This will show you a small dialog where you can configure the thresholds for the value of that object. Once the threshold is set, you're brought back to the previous dialog so you can continue selecting addtional objects to monitor. When you're finished, press the Done button to return to the main SNMP Monitor configuration dialog.
Similar to the other monitors, the SNMP Monitor also supports the Actions button for easily specifying alerts and actions to take when thresholds are passed, and a Schedule button to control how often the various SNMP objects are queried.