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transmit-rate (Schedulers)


Hierarchy Level


Specify the transmit rate or percentage for a scheduler.


If you do not include this statement, the default scheduler transmission rate and buffer size percentages for queues 0 through 7 are 95, 0, 0, 5, 0, 0, 0, and 0 percent, respectively.


On PTX10008 and PTX10016 routers, the default scheduler transmission rate is set to 25 percent for strict-high queues if you do not set the transmission rate for the schedulers for strict-high queues.



(Optional) Enforce the exact transmission rate. Under sustained congestion, a rate-controlled queue that goes into negative credit fills up and eventually drops packets. This value should never exceed the rate-controlled amount. For PTX Series routers, this option is allowed only on the non-strict-high (high, medium-high, medium-low, or low) queues.

percent percentage

Percentage of transmission capacity. A percentage of zero drops all packets in the queue unless additional bandwidth is available from other queues.

  • Range: 0 through 100 percent for M, MX and T Series routers and EX Series switches; 1 through 100 percent for PTX Series routers

  • On M Series Multiservice Edge Routers, for interfaces configured on 4-port E1 and 4-port T1 PICs only, you can configure a percentage value only from 11 through 100. These two PICs do not support transmission rates less than 11 percent.

  • The configuration of the transmit-rate percent 0 exact statement at the [edit class-of-service schedules scheduler-name] hierarchy is ineffective on T4000 routers with Type 5 FPC.

  • On MIC and MPC interfaces on MX Series routers, when the transmit rate is configured as a percentage and exact or rate-limit is enabled on a queue, the shaping rate of the parent node is used to compute the transmit rate. If exact or rate-limit is not configured, the guaranteed rate of the parent node is used to compute the transmit rate.

  • On PTX Series routers, unconfigured interfaces are equivalent to percent 0. This means the system offers no guaranteed rate on the interface, and the queue will always be scheduled in the excess priority.


Transmission rate, in 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: 3200 through 6,400,000,000,000 bps


For all MX Series interfaces, the rate can be from 65,535 through 6,400,000,000,000 bps.


(Optional) Limit the transmission rate to the rate-controlled amount by applying a policing action to the queue. Packets are hard-dropped when traffic exceeds the specified maximum transmission rate.


For PTX Series routers, this option is allowed only on the strict-high queue. We recommend that you configure rate limit on strict-high queues because the other queues may not meet their guaranteed bandwidths. The rate-limit option cannot rate limit the queue if strict-priority scheduling is configured with the strict-priority-scheduler statement.


The configuration of the rate-limit statement is supported on T4000 routers only with a Type 5 FPC.

remainder percentage

Use the remaining rate available.

Required Privilege Level

interface—To view this statement in the configuration.

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

Release Information

Statement introduced before Junos OS Release 7.4.

rate-limit option introduced in Junos OS Release 8.3. Applied to the Multiservices PICs in Junos OS Release 9.4.