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shaping-rate

Syntax

shaping-rate (rate | percent percentage);

Hierarchy Level

[edit class-of-service schedulers scheduler-name],[edit class-of-service traffic-control-profiles profile-name]

Release Information

Statement introduced in Junos OS Release 11.1 for the QFX Series.

Description

Configure the shaping rate. The shaping rate throttles the rate of packet transmission by setting a maximum bandwidth (rate in bits per second) or a maximum percentage of bandwidth for a queue or a forwarding class set. You specify the maximum bandwidth for a queue by using a scheduler map to associate a forwarding class (queue) with a scheduler that has a configured shaping rate. You specify the maximum bandwidth for a forwarding class set by setting the shaping rate for a traffic control profile, and then applying the traffic control profile and a forwarding class set to an interface.

We recommend that you configure the shaping rate as an absolute maximum usage and not as additional usage beyond the configured transmit rate (the minimum guaranteed bandwidth for a queue) or the configured guaranteed rate (the minimum guaranteed bandwidth for a forwarding class set).

Note: When you set the maximum bandwidth (shaping-rate value) for a queue or for a priority group at 100 Kbps or less, the traffic shaping behavior is accurate only within +/– 20 percent of the configured shaping-rate value.

Note: We recommend that you always apply a shaping rate to strict-high priority queues to prevent them from starving other queues. If you do not apply a shaping rate to limit the amount of bandwidth a strict-high priority queue can use, then the strict-high priority queue can use all of the available port bandwidth and starve other queues on the port.

Default

If you do not configure a shaping rate, the default shaping rate is 100 percent (all of the available bandwidth), which is the equivalent of no rate shaping.

Options

percent percentage—Shaping rate as a percentage of the available interface bandwidth.

Range: 1 through 100 percent

rate—Peak (maximum) rate, in bits per second (bps). You can specify a value in bits per second either as a complete decimal number or as a decimal number followed by the abbreviation k (1000), m (1,000,000), or g (1,000,000,000).

Range: 1000 through 10,000,000,000 bps

Required Privilege Level

interfaces—To view this statement in the configuration.
interface-control—To add this statement to the configuration.

 

Related Documentation

 

Published: 2014-07-23

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