282 CHAPTER 7: MONITORING THE NETWORK■ For other devices the hierarchy lists the device as the top-level folderand the known links to the device as nodes below that.Selecting the top-level folder, which is the default, changes the displayedlive graphs on the right-hand side of the display to graphs of the monitorsthat monitor the general state of the device.Selecting a link node changesthe displayed live graphs on the right-hand side of the display to graphsof the monitors that monitor the state of the link.■ When you launch the Live Graphs window for a link, the tree lists thelink as the top-level folder, and the right-hand side of the displayshows live graphs for all of the link’s monitors.Live Graphs Display The live graphs display area, on the right-hand side, shows live graphs forthe states of the monitors relevant to the item selected in the tree.Eachmonitor’s entry shows the name of the monitor that the graph is for andthe graph itself:Figure 126 Live Graph DisplayThe graph displays the historical state of the monitor. For example, for theIP Ping Service monitor, the graph displays a history of the IP pingresponse time for the device.A history for each monitor is maintained, by default, for ten minutes. Thisstored data allows you to instantly see the most recent ten minutes ofactivity on any monitor, at any time. This may be useful in helping todetermine the network activity immediately preceding a current networkproblem.If you launch the Live Graphs window within 10 minutes of startingmonitoring against a device or link, you will only see data for the timethat the device or link has been monitored. When you stop monitoringagainst a device or link, 3Com Network Director will discard allmaintained data against the device or link.
