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Hierarchy Level


Determine the percentage of excess port bandwidth for which a queue (forwarding class) that is not a strict-high priority queue or forwarding class set (priority group) can contend. Excess bandwidth is the extra port bandwidth left after strict-high priority queues and the guaranteed minimum bandwidth requirements of other queues (as determined by each queue’s transmit rate) are satisfied. With the exception of strict-high priority queues, the switch allocates extra port bandwidth to queues or to priority groups based on the configured excess rate. If you do not configure an excess rate for a queue, the default excess rate is the same as the transmit rate.

You cannot configure an excess rate on strict-high priority queues. Strict-high priority queues receive extra bandwidth based on an extra bandwidth sharing weight of “1”, which is not configurable. However, the switch serves traffic on strict-high priority queues up to the configured transmit rate before it serves any other queues, so by configuring an appropriate transmit rate on a strict-high priority queue, you can guarantee strict-high priority traffic on that queue is treated in the manner you want.


percent percentage—Percentage of the excess bandwidth to share.

  • Range: 0 through 100 percent

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 15.1X53-D10.