Configuring output filters for link performance alerts

You can set additional conditions on link alert output fields, so that only alerts satisfying these conditions are raised. For a link performance alert, the predefined set of elements on which you can use filters is limited to elements related to link characteristics and link utilization.

To configure output filters for a link alert:

  1. In the second step of the alert definitions wizard (Define triggering and propagation settings), switch to the Output filters tab.
  2. Click Add iconAdd filter group. It will display a pane in which you can select an element that you want to filter on and type a filtering expression. The list of available elements includes the link-related dimensions and metrics and an alert mode.
    1. Hover the mouse pointer above the element (dimension, metric, or other) name to display a list of elements to which you can apply a filter.

    2. Select an element from the list.

    3. Type the filter expression. When defining a filter, use basic syntax guidelines hidden under the Filter syntax guidelines icon. For more information, see Filter Syntax.

      While filtering by a metric value or by a specific dimension seems to be a standard action, filtering by an alert mode requires you to know the code names by which you can refer to each mode:

      SINGLEDIR

      Raise the alert if utilization in at least one direction, incoming or outgoing, is outside the specified threshold values.

      BOTHDIR

      Raise the alert if utilization in both directions, incoming and outgoing, is outside the specified threshold values.

      SNMPSINGLEDIR

      Raise the alert if SNMP utilization in at least one direction, incoming or outgoing, is outside the specified threshold values.

      SNMPBOTHDIR

      Raise the alert if SNMP utilization in both directions, incoming and outgoing, is outside the specified threshold values.

      BASELINE SINGLEDIR

      Raise the alert if baseline utilization in at least one direction, incoming or outgoing, is outside the specified threshold values.

      BASELINE BOTHDIR

      Raise the alert if baseline utilization in both directions, incoming and outgoing, is outside the specified threshold values.

      BASELINE SNMPSINGLEDIR

      Raise the alert if baseline SNMP utilization in at least one direction, incoming or outgoing, is outside the specified threshold values.

      BASELINE SNMPBOTHDIR

      Raise the alert if baseline SNMP utilization in both directions, incoming and outgoing, is outside the specified threshold values.

  3. Click Next to proceed to configuring alert notifications or click Finish to save the configuration.