proc SetCounterMultiValueNgpf { multiValue propertyIndex action } {
    # This API is for setting NGPF multivalue "property index" to true or false.
    # It checks to see if there is an overlay for the $propertyIndex.
    # If none, then create an overlay for the $propertyIndex.
    # If exists, verify if the overlay is for the $propertyIndex.
    # If it's not for the $propertyIndex, then create an overlay for it.

    # Example usage: EnableDisableSuppressArp calls this to 
    #                create, enable or disable a property index
    #                in which a property can have multiple indexes.

    set multiValueCurrentPattern [ixNet getAttribute $multiValue -pattern]
    if {$multiValueCurrentPattern != "counter"} {
	ixNet setAttribute $multiValue -pattern counter
	ixNet commit
	ixNet setAttribute $multiValue/counter -start $action
	ixNet commit
    }
    
    set overlayList [ixNet getList $multiValue overlay]
    
    set overlayDiscoveredFlag 0
    
    if {$overlayList != ""} {
	foreach overlay $overlayList {
	    set currentIndex [ixNet getAttribute $overlay -index]
	    
	    if {$currentIndex == $propertyIndex} {
		set overlayDiscoveredFlag 1
		puts "\nSetNgpfCounterMultiValue: Action = $action : propertyIndex = $propertyIndex"
		puts "\t$overlay"
		catch {ixNet setMultiAttr $overlay -value $action -valueStep $action -count 1 -index $propertyIndex} errMsg
		if {$errMsg != "::ixNet::OK"} {
		    puts "\nError SetNgpfCounterMultiValue: Set action to $action for overlay $currentOverlay: $errMsg"
		    return 1
		}
		ixNet commit
	    }
	}
	
	if {$overlayDiscoveredFlag == 0} {
	    # Getting here means no overlay found for the property Index.
	    # Have to create an overlay with the proper -index number.
	    puts "\nSetNgpfCounterMultiValue: No NGPF overlay for propertyIndex: $propertyIndex"
	    puts "Creating new overlay"
	    set currentOverlay [ixNet add $multiValue overlay]

	    puts "\nSetNgpfCounterMultiValue: Action = $action : propertyIndex = $propertyIndex"
	    puts "\t$overlay"
	    catch {ixNet setMultiAttr $currentOverlay -value $action -valueStep $action -count 1 -index $propertyIndex} errMsg
	    if {$errMsg != "::ixNet::OK"} {
		puts "\nError SetNgpfCounterMultiValue: Set action to $action for overlay $currentOverlay: $errMsg\n"
		return 1
	    }
	    
	    ixNet commit
	}
    }
    
    if {$overlayList == ""} {
	# Getting here means there are no overlays
	
	# Create Overlays with proper index number based on the portIndex
	# in $root/globals/topology/ipv4 -rowNames indexes
	puts "\nSetNgpfCounterMultiValue: No overlay exists"
	set currentOverlay [ixNet add $multiValue overlay]
	puts "Creating overlay: $currentOverlay"
	catch {ixNet setMultiAttr $currentOverlay -value $action -valueStep $action -count 1 -index $propertyIndex} errMsg
	if {$errMsg != "::ixNet::OK"} {
	    puts "\nError SetNgpfCounterMultiValue: Set action to $action for overlay $currentOverlay: $errMsg\n"
	    return 1
	}
	ixNet commit
    }
    return 0
}