To enable sub-interface performance analysis, set the parameter AnalysisModeOfSubInterface-Performance to ENABLED for the appropriate interface.The steps to do this are as follows:
Open the Domain Manager Administration Console via Windows or via the Web Console.
From the tool bar, click on configure and select Polling and Thresholds.
Select the Tresholds Tab in the bottom left corner.
Underneath the domain tree, click the plus sign for Interface Groups
Select an Interface and click on the plus sign.
Click the plus sign to the left of Settings.
Select Ethernet Interface/Port Performance.
Scroll to the top of AnalysisModeofSubInterface-Performance.
Click on the drop down menu and select enable.