Displaying device and interface availability in a network view

Using the Unavailable Resources widget you can monitor, within a selected network view, the number of device and interface availability alerts that have been open for more than a configurable amount of time. By default this widget charts the number of device and interface availability alerts that have been open for up to 10 minutes, for more than ten minutes but less than one hour, and for more than one hour.

1. Network Health Dashboard
2. In the Network Health Dashboard, select a network view from the network view tree in the Network Views. The other widgets update to show information based on the network view that you selected.
   In particular, the Unavailable Resources widget updates to show device and interface availability in the selected network view.
   A second tab, called "Network View", opens. This tab contains a dashboard comprised of the Network Views GUI, the Event Viewer, and the Structure Browser, and it displays the selected network view. You can use this second tab to explore the topology of the network view that you are displaying in the Network Health Dashboard.

   For information about specifying which network view tree to display in the Network Health Dashboard, see Configuring the network view tree to display in the Network Health Dashboard.

3. In the Unavailable Resources widget, proceed as follows:
   To determine the number of unavailable devices and interface alerts, use the following sections of the chart and note the colors of the stacked bar segments and the number inside each segment.

   Restriction: By default, all of the bars described as follows are configured to display. However, you can configure the Unavailable Resources widget to display only specific bars. For example, if you configure the widget to display only the Device Ping and the Interface Ping bars, then only those bars will be displayed in the widget.

   Note: By default the data in the Unavailable Resources widget is updated every 20 seconds.

   SNMP Poll Fail

   Uses color-coded stacked bars to display the number of SNMP Poll Fail alerts within the specified timeframe.

   SNMP Link State

   Uses color-coded stacked bars to display the number of SNMP Link State alerts within the specified timeframe.

   Interface Ping

   Uses color-coded stacked bars to display the number of Interface Ping alerts within the specified timeframe.

   Device Ping

   Uses color-coded stacked bars to display the number of Device Ping alerts within the specified timeframe.

   Color coding of the stacked bars is as follows:

   Table 1. Color coding in the Unavailable Resources widget

   Color	Meaning
   Yellow	Number of alerts that have been open for up to 10 minutes.
   Pink	Number of alerts that have been open for more than 10 minutes and up to one hour.
   Blue	Number of alerts that have been open for more than one hour.

   Click any one of these bars to show the corresponding alerts for the devices and interfaces in the Event Viewer at the end of the Network Health Dashboard.

   Note: You can change the time thresholds that are displayed in this widget. The default threshold settings are 10 minutes and one hour. If your availability requirements are less stringent, then you could change this, for example, to 30 minutes and 3 hours. The change applies on a per-user basis.

   If none of the devices in the current network view is being polled by any one of these polls, then the corresponding stacked bar will always displays zero values. For example, If none of the devices in the current network view is being polled by the SNMP Poll Fail poll, then the SNMP Poll Fail bar will always displays zero values. If you are able to access the Configure Poll Policies panel in the Network Polling GUI, then you can use the Device Membership field on that table to see a list all of devices across all network views that are polled by the various poll policies.