Reporting › Router Context Views › Top Interface Discard Rate (Table)

Top Interface Discard Rate (Table)

Use the Top Interface Discard Rate view to determine places where capacity problems may be occurring. Discards typically occur when interface buffers no longer have the capacity to store packets (because, for example, buffer memory is exhausted). Buffer congestion often indicates that the rate at which packets are arriving at the interface exceeds its transmission rate. Discards frequently occur in bursts. Elevated discard rates may be the result of either microcongestion or chronic congestion issues.

Use this view to identify the interfaces with the highest discard rates for inbound and outbound traffic for the selected device. Acceptable discard rates depend on the applications being served, the transmission protocols, and the SLAs established within your organization.

The Top Interface Discard Rate view includes interfaces in the selected managed item with the highest total discard rates during the selected time period. Color-coded bar charts indicate severity.

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

By default, the Top Interface Discard Rate view contains the following information:

Device

Identifies the device whose data is reflected in the view. 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.

Average Percent Discards In

Is the average rate of packet discards, expressed as a percentage of inbound traffic on the interface during the reporting period.

Average Percent Discards Out

Is the average rate of packet discards, expressed as a percentage of outbound traffic on the interface during the reporting period.

More information:

Interface Errors and Discards

Interface Reporting

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. Change the settings that are applied to the view if desired. Not all settings are available for all table view types:

   Measurement Settings

   Lets you select whether a total count or an average is displayed in the view.

   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.

   Direction Settings

   Lets you select the direction of data flow—either into or out of the interface.

   Affected % of reporting period

   Where available, sets the percentage of the reporting interval to which thresholds are applied.

   Default: 25%.

4. Click to expand nodes in the Context Settings area.
5. Locate the group whose data you want to see in the view and select it.
6. 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.

7. Click Save.

   The view is refreshed to reflect your updates.