C
HAPTER
11
| Quality of Service
Packet Scheduling
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PACKET SCHEDULING
You can set the switch to service the queues based on a strict rule that
requires all traffic in a higher priority queue to be processed before lower
priority queues are serviced, Weighted Fair Queuing (WFQ), or Weighted
Round-Robin (WRR) queuing that specifies a relative weight of each queue.
The traffic classes are mapped to one of the eight egress queues provided
for each port. You can assign a weight to each of these queues (and
thereby to the corresponding traffic priorities). This weight sets the
frequency at which each queue will be polled for service, and subsequently
affects the response time for software applications assigned a specific
priority value.
PARAMETERS
◆ Scheduling Algorithm — Selects the service method used for port
egress queues.
■
Weight-fair-queue — Services the egress queues containing data
based on the weight of the queue compared to the sum of the
weights of all queues. (This is the default selection.)
■
Weight-round-robin — Shares bandwidth at the egress ports by
using the scheduling weights for queues 1 through 8 respectively.
WRR specifies a relative weight for each queue that determines the
percentage of service time the switch services each queue before
moving on to the next queue.
◆ Queue ID — Output queue buffer. (Range: 1-8, where 8 is the highest
priority queue)
◆ Weight — Set a new weight for the selected traffic class. (Range: Strict
or 1-15)
Use queue weights 1-15 for queues to allocate service time based on
WFQ or WRR. Queue weights must be configured in ascendant manner,
assigning more weight to each higher numbered queue.
Strict priority requires all traffic in the queue to be processed before
lower priority queues are serviced.
WEB INTERFACE
To configure port-level DSCP remarking:
1. Click Configuration, QoS, Packet Scheduling.
2. Select the scheduling algorithm, WFQ or WRR.
3. Map scheduling weights to a queue ID, or select “Strict.”
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