Shaper Template
TheShapertemplate 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 thesystem bandwidth.
The Shaper’s parameters are organized into ten traffic classes. Four traffic classes are preconfigured and namedreal-time,interactive,default, andbest 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-levelwanShaper. 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 theConfiguration Templates & Policies > Shaping > Shaperpage.
Dynamic Rate Control
Tunnel Max Bandwidthis the maximum rate at which an appliance can transmit.
Auto BWnegotiates the link between a pair of appliances. In this example, the appliances negotiate each link down to the lower value, 100 Mbps.
However, ifAandBtransmit at the same time,Hubcould easily be overrun.
IfHubexperiences congestion:
SelectEnable Dynamic Rate Control. AllowsHubto regulate the tunnel traffic by lowering each remote appliance’s Tunnel Max Bandwidth. The smallest possible value is that appliance’sTunnel Min(imum)Bandwidth.
Inbound BW Limitcaps 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 | 使一个单独的塑造者佛r 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 theExcess Weightingcolumn. 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 specifiedMax Wait Timeare 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. MaxoverridesMinif you setMin Bandwidthto a value greater thanMax 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 -1is first,10is 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, use0(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, whenwan0goes down,wan0bandwidth is removed from the total bandwidth when recalculating. |
| Traffic Name | Name assigned to a traffic class, either prescriptively or by the user. |