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Shaper Tab

Configuration > Templates & Policies > Shaping > Shaper

This report provides a view of the Shaper settings.

The Shaper provides a simplified way to globally configure QoS (Quality of Service) on the appliances.



  • It shapes traffic by allocating bandwidth as a percentage of the system bandwidth.

  • The Shaper’s parameters are organized into ten traffic classes. Four traffic classes are preconfigured and named real-time, interactive, default, and best effort.

  • The system applies these QoS settings globally after compressing (deduplicating) all the outbound tunnelized and pass-through–shaped traffic, shaping it as it exits to the WAN.

  • To manage Shaper settings for an appliance’s system-level WAN Shaper, access the Shaper template.

  • For minimum and maximum bandwidth, you can configure traffic class values as a percentage of total available system bandwidth and as an absolute value. The appliance always provides the larger of the minimum values and limits bandwidth to the lower of the maximum values.

  • Max overrides Min if you set Min Bandwidth to a value greater than Max Bandwidth.

Shaper Tab Settings

Field Description
Excess Weighting If there is bandwidth left over after satisfying the minimum bandwidth percentages, the excess is distributed among the traffic classes in proportion to the weightings specified in the Excess Weighting column. Values range from 1 to 10,000.
Interface Shaper Enables a separate shaper for a specific WAN interface.

For WAN optimization, the interface shaper can be used, but it is not recommended.

For SD-WAN, it should never be used because overlay traffic is not directed to an interface shaper; traffic is always shaped by the default WAN shaper.
Max Bandwidth % This limits the maximum bandwidth that a traffic class can use to a percentage of total available system bandwidth.
Max Bandwidth Absolute (kbps) This limits the maximum bandwidth that a traffic class can use to an absolute value (kbps). You can specify a maximum absolute value to cap the bandwidth for downloads and streaming.
Max Wait Time Any packets waiting longer than the specified Max Wait Time are dropped.
Min Bandwidth % Refers to the percentage of bandwidth guaranteed to each traffic class, allocated by priority. However, if the sum of the percentages is greater than 100%, lower-priority traffic classes might not receive their guaranteed bandwidth if it is all consumed by higher-priority traffic.

Max overrides Min if you set Min Bandwidth to a value greater than Max Bandwidth.
Min Bandwidth Absolute (kbps) This guarantees a specific level of service when total system bandwidth declines. This is useful for maintaining the quality of VoIP, for example.
Priority Determines the order in which to allocate each class’ minimum bandwidth - 1 is first, 10 is last.
Rate Limit (kbps) You can set per-flow rate limit that a traffic class uses by specifying a number in the Rate Limit column. For no limit, use 0 (zero).
Recalc on IF State Changes When an interface state changes to UP or DOWN, selecting this recalculates the total bandwidth based on the configured bandwidth of all UP interfaces. For example, when wan0 goes down, wan0 bandwidth is removed from the total bandwidth when recalculating.
Traffic ID The number assigned to the traffic class.
Traffic Name The name assigned to a traffic class, either prescriptively or by the user.

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