The Top Least Reachable Devices chart lets you determine which devices have been powered on but unreachable during a selected time frame. A device can be unreachable due to a fault in the network path to the device. For example, the switch port connecting the device was down, or the WAN connection to the site where the device is located was down. The device can also be unreachable because it has become unresponsive. Or new security protocols that have been implemented are blocking ping tests to the device from a CA data source.
The Top Least Reachable Devices chart displays reachability percentages for the indicated devices during the selected time period. The bar chart shows the 10 devices with the greatest amount of connectivity-related downtime (the lowest average reachability).
By default, the Top Least Reachable Devices chart includes the following information:
Identifies the managed item that is associated with the performance data. If an administrator defined an alias for the device item, the alias is displayed. Otherwise, the discovered device name is displayed.
Reports the percentage of attempts that the device was reachable—a ping response was received from the device during each polling interval—divided by all attempts during the selected time period. For each polling interval, the reachability is one of the following values:
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