Help for XR SNMP Tools - XR PerfMon Help

Using the FrontEnd

Special Tag Configuration

Special Tags are derived from ordinary SNMP variables, in most cases, implementing special calculations to obtain performance indicators based on raw SNMP data. Complex interface statistics (like bandwidth utilization, error rates or broadcast rates) can be obtained by creating special tags for each interface.

For each listed variable in the TAG view, you can manually configure the data type and filtering.

Help for XR SNMP Tools - Special TAG List View

Help for XR SNMP Tools - Special TAG List View

Special TAG View

Using the bottom toolbar, you can:

	Tag Scan: Scans the selected device for interfaces and create special tags automatically.
	Stop Scan: Stops any active device scans (tag scan).
	Check All: Checks all scanned/added variables.
	Unselect All: Unselects all scanned/added variables.

To manually add a Special Tag, you can use the "Add Tag" button on the top toolbar. Alternatively, you can right-click any empty space in the Tag View and select an item from the context menu. You can add:

	Statistical Items: Creates indicators based on raw data collected from a SNMP device.
			Link Utilization: Measures the usage of a link, in percent. Note that if the link is under very low usage, the utilization might be reported as 0%, as the value of this tag is an integer. If you need to measure very low rates, you might instead use Delta Items to monitor the ifInOctects and ifOutOctects variables of the link.
			Link Input Error Rate (raw): Measures the error rate of a link caused by input packets.
			Link Input Error Rate (percent): Measures the percent error rate of a link caused by input packets.
			Link Output Error Rate (percent): Measures the percent error rate of a link caused by output packets.
			Link Broadcast Rate: Measures the non routed data rate of a link.
			Link Unicast Rate: Measures routed data rate of a link.
	Delta Items: Calculates the delta (in time) of raw SNMP data.
	Specific Trap Items: Creates indicators that are triggered when specific trap events are received from the SNMP device. In this case you must provide a valid object identifier to be verified before triggering the state.
	Generic Trap Items: Creates indicators that are triggered when any trap events are received from the SNMP device. All traps are capable of triggering the state.

Note that you must enable and configure your SNMP device before setting up traps in the server.
You can edit the properties of a particular tag by either selecting it on the list and clicking on the "Tag Properties" button or right-clicking the tag and choosing "Tag Properties" from the context menu.

Tag Add/Remove Toolbar
Both options (adding or editing a Special Tag item) will display a detailed Tag configuration dialog box.

Help for XR SNMP Tools - Special Tag Configuration Dialog Box

Help for XR SNMP Tools - Special Tag Configuration Dialog Box

Special Tag Configuration Dialog Box

You can customize the following settings:

	OPC Name: Name that will be used by the server to publish this variable.
	Description: Detailed description of this special tag item.
	Filter MIB-II Variables to Required Parameters Only: If you check this box, the system will filter the dropdownlist to show only the required items.
	Parameter 1: First raw SNMP parameter required to calculate the tag value.
	Parameter 2: Second raw SNMP parameter required to calculate the tag value.
	Parameter 3: Third raw SNMP parameter required to calculate the tag value.
	1st Order Filter: Check to create an additional tag (with "_Filtered" in the name) that applies a low pass filter in this item.

The parameter list is loaded from the main OID List View from this device, so it's recommended that you scan the device for MIB-II OIDs before creating/editing Special Tags.
The required parameters changes when creating different Special Tags. This dialog shows beside each parameter (1, 2 or 3) what MIB-II variable is required to calculate the Special Tag.
Please notice that if you use a wrong parameter instead of the required one, the Tag calculation will fail. After editing or adding the tag, click on the "OK" button to close the Special Tag Edit dialog and update the item settings. If you want to discard all changes, just click the "Cancel" button to close the dialog.