Reporting › Network Device Health Dashboard › Top Interface Errors/Discards (Table)

Top Interface Errors/Discards (Table)

The Top Interface Errors/Discards view lets you quickly determine likely places where problems are occurring.

When detected in the inbound direction, errors typically indicate problems with the transmission medium (for example, cable or fiber). Outbound errors indicate problems with the interface hardware. The acceptable rate of errors for any given interface is typically zero (0) errors.

Each reported discard is a packet that the reporting interface threw out. The sending host must retransmit such packets if a reliable protocol such as TCP is used to send the data end-to-end. Interface discards are typically the result of congested queues serving the interface.

Use this view to compare discard and error rates for inbound and outbound traffic on selected interfaces. Interfaces in the reporting groups or in the managed objects with the highest total loss rates during the selected time period are included. By default, averages are displayed as an average total per interface for the selected time range. However, you can change the View Metrics As setting to see rate metrics (Rate value) or totals (Count value).

You can sort the table columns to compare error rates by interface description, for example.

Click the name of an item to see more data from that item.

By default, the Top Interface Errors/Discards view contains the following information:

Device Name

Identifies the managed item that was the source of the performance data. If an administrator defined an alias for the device item, the alias is displayed. Otherwise, the discovered device name is displayed.

Name

Is the name of the interface.

Description

Is the type of interface, such as Gigabit Ethernet. If an administrator defined an alternate interface description, the alternate description is displayed. Otherwise, the discovered description is displayed.

Total Discards In

Is the total number of discarded packets for inbound traffic on the interface during the reporting period.

Total Discards Out

Is the total number of discarded packets for outbound traffic on the interface during the reporting period.

Total Errors In

Is the total number of errored packets for inbound traffic on the interface during the reporting period.

Total Errors Out

Is the total number of errored packets on the interface during the reporting period.

Edit Table View Settings

You can change several settings for each view on a dashboard. In addition to providing a new title, you can change settings that are related to severity ratings. To ensure excellent performance in a large reporting environment, you can set an upper limit on the number of results that are returned. You can also select another group context for the data.

Follow these steps:

1. Click the Options (gear) icon on the view, and select Edit from the menu.

   The view Settings dialog opens.

2. Change the view Title or Subtitle to reflect the modified view.
3. Select whether to show the metric as a rate (N per second) or as a total count.
4. Change the settings that are applied to the view if desired. Not all settings are available for all table view types:

   Moderate Status Start

   The lowest value for metrics that are displayed as Moderately Degraded in the view. Applies to the color-coding of gauge charts in gauge/table views.

   Default: Depends on the performance metrics reflected in the view. Click Use Defaults to revert to factory defaults.

   Critical Status Start

   The lowest value for metrics that are displayed as Critically Degraded in the view. Applies to the color-coding of gauge charts in gauge/table views.

   Default: Depends on the performance metrics reflected in the view.

   Results Limit (Max Rows)

   Limits the number of table rows that are returned by the associated database query to preserve monitoring-system performance.

5. (Optional) Select the 'Time Filtering: Enabled' check box.
6. Select the Time Zone filter that best represents the geographic location of the business function. The list contains only time zones that are associated with the site groups of the current tenant.
7. Select the appropriate Business Hour filter. The options in the list are available only after you select a Time Zone filter.

   Important! The list is not filtered by group or item context. If you have selected a context for the view, select the business hours that are associated with the applicable site. Otherwise, the view contains no data. Click to expand nodes in the Context Settings area.

8. Click to expand nodes in the Context Settings area.
9. Locate the group whose data you want to see in the view and select it.
10. Select the scope of your changes from the Apply Changes drop-down. Select one of the following options:
    • For All Tenant Users: Saves the changes so that they are only available to users associated with your tenant (possibly the Default Tenant).
    • My User Account: Saves the changes to your user account as a default for this view.
    • My Current Session: Reverts the changes when you log out.

    Note: The availability of these options depends on your user account role rights.

11. Click Save.

    The view is refreshed to reflect your updates.