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Hierarchy Level


For Gigabit Ethernet IQ, Channelized IQ PICs, and FRF.15 and FRF.16 LSQ interfaces only, base the delay-buffer calculation on a delay-buffer rate.


If you do not include this statement, the delay-buffer calculation is based on the guaranteed rate if one is configured, or the shaping rate if no guaranteed rate is configured. For more information, see Table 1.


percent percentage

For LSQ interfaces, delay-buffer rate as a percentage of the available interface bandwidth.

  • Range: 1 through 100 percent


Delay-buffer 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 6,400,000,000,000 bps


    Through Junos OS Release 13.3, the upper limit is 160,000,000,000 bps. Starting with Junos OS Release 14.1, the upper limit is 6,400,000,000,000 bps.


    Starting with Junos 17.2R1, the default minimum delay buffer threshold for MPCs is changed from 4096 bytes to 1568 bytes. This change improves the delay of time that packets can spend in the buffer. However, this lower minimum delay buffer threshold is easier to exceed than before and can cause tail drops. Juniper recommends you configure sufficient delay buffer rate to reduce this impact. In CIR mode, for nodes that do not have a guaranteed rate configured, Juniper also recommends that you configure a delay buffer rate equal to the shaping rate.

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 7.6.