This help page is for version 3.8. The latest available help is for version 8.1.
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 requires SNMP credentials to be set, and also specific SNMP objects and thresholds to be selected.
The default SNMP credentials are set to use v2c with community string set to 'public'. That will work in many cases, but you might need to make changes depending on your environment. The current settings are shown in the dialog above near the top, and pressing the Configure button will let you change those settings. You can also right-click the computer/device in the Console and choose Type & Credentials -> Set SNMP Settings.
This dialog allows you to set the following items:
Once you have entered the information that will allow access to your SNMP agent, press OK in the "Set SNMP Settings" dialog to save the SNMP server settings and to return to the Configure SNMP Monitor dialog.
From the Configure SNMP Monitor dialog, 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.
Unlike many SNMP browsers that only show objects for which you have MIBs loaded, this SNMP browser shows all objects that are available on the remote machine. Loading MIBs will add additional detail (like symbolic object names instead of just the numeric OID, and also textual descriptions for the fields).
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.
The SNMP monitor can create charts from any of the counter values that are being monitored. This includes bar and line charts. Tabular HTML and .CSV output for importing into other apps (Excel) are also possible.
If you can't connect to a server/device via SNMP, make sure to double check the SNMP settings (version and community string in particular). Windows servers by default don't enable 'public' as a community string, and they don't accept SNMP requests from the network by default. These can both be changed by going to the SNMP server (in the Administrator Tools -> Services applet), to the Security tab.