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shaping-rate (Traffic Control Profiles)

Syntax

Hierarchy Level

Note:

Only devices that support enhanced transmission selection (ETS) or hierarchical scheduling support the traffic-control-profiles hierarchy.

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.

For ETS or hierarchical scheduling configuration, you specify the maximum bandwidth for a forwarding class set by setting the shaping rate for a traffic control profile. Then you associate the scheduler map with the traffic control profile, and then you apply the traffic control profile and a forwarding class set to an interface.

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:

On QFX5200, QFX5100, and EX4600 devices, 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.
Note:

On QFX5200 Series switches, a granularity of 64kbps is supported for the shaping rate. Therefore, the shaping rate on queues for 100g interfaces might not be applied correctly.
Note:

QFX10000 Series switches do not support the shaping-rate statement. However, you can configure the transmit-rate exact option to prevent a queue from consuming more bandwidth than you want the queue to consume.

On QFX10000 Series switches, we recommend that you use the transmit rate to set a limit on the amount of bandwidth that receives strict-high priority treatment on a strict-high priority queue. Traffic up to the transmit rate receives strict-high priority treatment. Traffic in excess of the transmit rate is treated as best-effort traffic that receives the strict-high priority queue excess rate weight of “1”. Do not use a shaping rate to set a maximum bandwidth limit on strict-high priority queues on QFX10000 Series switches.

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

interface—To view this statement in the configuration.

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

Release Information

Statement introduced in Junos OS Release 11.1.

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