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PARAMETERS
These parameters are displayed:
Displaying QoS Egress Port Schedulers
◆
Port
– Port identifier.
◆
Mode
– Shows the scheduling mode for this port.
◆
Weight
– Shows the weight of each egress queue used by the port.
Configuring QoS Egress Port Scheduler, Queue Scheduler and Port Shapers
◆
Scheduler Mode
– The switch can be set to service the queues based on a strict rule that
requires all traffic in a higher priority queue to be processed before the lower priority
queues are serviced, or Deficit Weighted Round-Robin (DWRR) queuing which specifies a
scheduling weight for each queue. (Options: Strict, Weighted; Default: Strict)
DWRR services the queues in a manner similar to WRR, but the next queue is serviced only
when the queue’s Deficit Counter becomes smaller than the packet size to be transmitted.
Note that weighted scheduling uses a combination of weighted service for queues 0 - 6, and
strict service for the high priority queues 7 and 8.
◆
Queue Shaper
– Controls whether queue shaping is enabled for this queue on this port.
■ Enable – Enables or disables queue shaping. (Default: Disabled)
■ Rate – Controls the rate for the queue shaper. The default value is 500. This value is
restricted to 100-1000000 kbps, or 1-3300 Mbps.
■ Unit – Unit of measure for the queue shaper rate as “kbps” or “Mbps.” (Default: kbps)
■ Excess – Controls whether the queue is allowed to use excess bandwidth. (Default:
Disabled)
◆
Queue Scheduler
– When the Scheduler Mode is set to Weighted, you need to specify a
relative weight for each queue. DWRR uses a predefined relative weight for each queue
that determines the percentage of service time the switch services each queue before
moving on to the next queue. This prevents the head-of-line blocking that can occur with
strict priority queuing.
■ Weight – A weight assigned to each of the queues (and thereby to the corresponding
traffic priorities). This weight sets the frequency at which each queue is polled for service,
and subsequently affects the response time for software applications assigned a specific
priority value. (Range: 1-100; Default: 17)
■ Percent – The weight as a percentage for this queue.
◆
Port Shaper
– Sets the rate at which traffic can egress this queue.
■ Enable – Enables or disables port shaping. (Default: Disabled)
■ Rate – Controls the rate for the port shaper. The default value is 500. This value is
restricted to 100-1000000 kbps, or 1-3300 Mbps
■ Unit – Controls the unit of measure for the port shaper rate as “kbps” or “Mbps.” (Default:
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