Viewing VLAN Changes

The VLAN Changes page (Device Viewer > Switch > VLAN Changes) presents a zoomable bar chart reflecting the frequency of VLAN topology changes in the network. You can perform basic troubleshooting of problems in the spanning tree network, as VLAN changes usually occur as a result of topology changes in the network, for example when a switch port goes down and the spanning tree has to reconverge around a different set of designated ports. To display the history for a specific VLAN, open the VLAN list (in the header), then click the VLAN name. Clicking a bar object in the chart displays the event log describing the change.

Click and drag the mouse across any part of the chart to zoom into a data set. To zoom back out, click Show All in the chart.