The Cisco Stack Layer
Using the test mapped to this layer, administrators can figure out the current status of the switch and the role of the switch.
By default, this layer will appear only when the Stack Switch Status test is enabled. To enable the test, go to the ENABLE / DISABLE TESTS page using the menu sequence : Agents -> Tests -> Enable/Disable, pick Cisco Catalyst Switch as the desired Component type, set Performance as the Test type, choose the test from the DISABLED TESTS list, and click on the < button to move the test to the ENABLED TESTS list. Finally, click the Update button.