Uptime

To view the uptime details of a network device, you can select the Uptime option from the Subsystem list. Figure 1 then appears.

Figure 1 : The Network Device Uptime Dashboard

This dashboard reveals the following:

1. The Device Uptime section of the dashboard reveals the total time for which the network device has been up and running since it was last rebooted. The Uptime/DownTime Summary section provides a quick summary of the availability of the device during the last 24 hours (by default) - the details include: the total duration for which the device has been up and running in the last 24 hours, the percentage uptime, the total duration (in the last 24 hours) for which the device was down, the percentage of downtime, and number of reboots during the last hour. Using these details, you can determine whether the agreed uptime levels for the device were met or not, and if not, how much is the device falling short of its desired performance levels.
2. You can also infer whether the device experienced any reboots during the last 24 hours. To know more about each reboot, refer to the Reboot Summary section. For every reboot that occurred in the last 24 hours (by default), this section reveals when the device was shutdown, when the reboot occurred, and how long did the device remain down until it was rebooted. This clearly indicates the frequency of the reboots, and helps determine whether such reboots were scheduled or unexpected.
3. The default Measure graphs in the History section indicate how long during the last 24 hours (by default) the device has been up, and whether the reboots scheduled for the device have occurred during the last hour or not. 
4. To view the measure graphs clearly, click on a graph of interest - this will enlarge that graph. Using these graphs, breaks in the availability of the device and failure of reboot schedules can be accurately identified and investigated. In addition, you can modify the dimension of the measure graphs from the default 3d to 2d.
5. Click on the icon at the right, top corner of the History section to view summary graphs using which you can effectively perform service level audits on a device, based on the duration of their availability. Determine the percentage of time for which the device was operational during the last day (by default), and also be notified of reboots that might have occurred on the device during the default timeline. If required, you can click on the Timeline link alter the graph timeline. 
6. Clicking on the icon in the History section will display trend graphs on device uptime;these trends reveal when during the last 24 hours uptime was the lowest, and when reboots failed. If required, you can click on the graph to expand it and alter its Timeline.
7. Besides the above, you can instantly change the timeline of the measure/summary/trend graphs in the History tab page and that of the Uptime/Downtime Summary and Reboot Summary. To change the timeline of a single graph on the other hand, click on the graph to enlarge it, and then proceed to change its timeline. 
8. Also, an enlarged summary/trend graph allows you to alter the graph Duration - i.e., view the daily or monthly summary/trend information, instead of the default hourly data.
9. Moreover, by default, the trend graphs in the History tab page plot the minimum and maximum values of a measure during the given timeline. In enlarged trend graphs, you can change the Graph type so that the average values or sum of trend values are plotted in the trend graphs instead.
10. At any point in time, you can switch to the measure graphs by clicking on the button.