excess-rate (Schedulers)
Syntax
excess-rate (percent percentage | proportion value);
Hierarchy Level
[edit class-of-service schedulers scheduler-name], [edit class-of-service traffic-control-profiles traffic-control-profile-name]
Description
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.
For
platforms that support the
proportion
option,
this option provides a greater range of values over the
percent option and hence influences the priorities assigned
to the queues.
Options
percentage—Percentage
of the excess bandwidth to share.
Range: 0 through 100 percent
Default: Excess bandwidth is shared in proportion to the configured transmit rate of each queue.
value—Proportion
of the excess bandwidth to share.
Range: 0 through 1000
Configure MPCs with increments of 10 from 0 through 1000.
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 9.3.