Preventing Specific Devices from Being Discovered by Nectus
In this chapter, you’ll learn how to prevent specific Device types from being discovered by Nectus. These Devices remain hidden until you allow Nectus to discover them again.
The specific topics we will cover in this chapter are:
Why Prevent Specific Devices from Being Discovered?
How Does Nectus Prevent Specific Devices from Being Discovered?
Adding Devices to the Ignore OID List
Editing the Ignore OID List
1. Why Prevent Specific Devices from Being Discovered?
Preventing certain Device types from being discovered and displayed in the SNMP Devices list makes it easier to manage your network. For example, you could have hundreds or thousands of printers connected to your network. But under normal circumstances, you probably don’t need to monitor them. Preventing Nectus from discovering them saves system resources for the Device types you do want to monitor.
2. How Does Nectus Prevent Specific Devices from Being Discovered?
Nectus maintains information about every SNMP Device on the network in a Management Information Base (MIB). It groups information about similar Devices into levels. The highest level is the Manufacturer Level. Next is the Major Product Category Level, followed by the Product Specific Level. Nectus groups all instances of a particular Device type (Dell iDRACs for example) at the Product Specific Level. They are all assigned a Sub-Category Name and a common Object ID (OID) Prefix.
To prevent a specific type of Device from being discovered, you add its OID Prefix to the Ignore OID List. Once a day Nectus scans the network looking for Devices. Before it does, it consults the Ignore OID List, and ignores any Device with an Object ID (OID) contained in the List.
3. Adding Devices to the Ignore OID List
To add a Device type to the Ignore OID List, go to the SNMP Devices Panel on the Nectus Home screen and open the All Devices list. Navigate to the Product Specific Level containing the type of Device you want to hide and right-click it. In the shortcut menu that appears, select Add to Ignore List and Delete.
Confirm the operation in the “Add to Ignore List and Delete” dialog box that appears.
Nectus adds the Device type to the Ignore OID List and removes this Sub-Category and all its Devices from the SNMP Devices list.
4. Editing the Ignore OID List
You can manually edit the Ignore OID List to hide Device types, make them discoverable again, or change the OID Prefix associated with them.
To edit the Ignore OID List go to the Nectus Home Screen and select Settings -> Network Discovery Settings.
This opens the “WMI Monitoring Settings” dialog box. Select the Ignore OID List tab.
Use the controls here to add Device types to the Ignore OID List or remove them from it. Any previously hidden Devices will appear the next time Discovery runs.
You can also manually change the OID Prefix by clicking the Edit icon to the right of the Sub-category to open the “Update OID” dialog box.
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