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Shaper Template

The Shaper template is a simplified way of globally configuring QoS (Quality of Service) on the appliances:

  • The Shaper 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.

  • Applying the template to an appliance updates its system-level wan Shaper. If the appliance has any added, interface-specific Shapers, they are preserved.

  • 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.

  • You can rename or edit any traffic class.

  • To view any applied configurations, access the Configuration Templates & Policies > Shaping > Shaper page.


Dynamic Rate Control

Tunnel Max Bandwidth is the maximum rate at which an appliance can transmit.

Auto BW negotiates the link between a pair of appliances. In this example, the appliances negotiate each link down to the lower value, 100 Mbps.


However, if A and B transmit at the same time, Hub could easily be overrun.

If Hub experiences congestion:

  • Select Enable Dynamic Rate Control. Allows Hub to regulate the tunnel traffic by lowering each remote appliance’s Tunnel Max Bandwidth. The smallest possible value is that appliance’s Tunnel Min(imum) Bandwidth.

  • Inbound BW Limit caps how much bandwidth the appliance can receive.

Field Description
Add Interface Shaper Adds an interface-specific shaper for outbound or inbound traffic.
Enable 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.
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 Interface that is being shaped.
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 Name Name assigned to a traffic class, either prescriptively or by the user.

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