D-Link DXS-3600 Series Reference Manual page 68

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
From Port ~ To Port
Scheduler Method
Figure 7-2 Port Scheduler Method Window
Description
Select the range of ports that will be used for this configuration here.
Select the scheduler method that will be applied to the specified
port(s). Options to choose from are Strict Priority (SP), Round-Robin
(RR), Weighted Round-Robin (WRR), Weighted Deficit Round-Robin
(WDRR), and Enhanced Transmission Selection (ETS). By default, the
output queue scheduling algorithm is WRR.
Strict Priority (SP) specifies that all queues use strict priority
scheduling. It provides strict priority access to the queues from the
highest CoS queue to the lowest.
Round-Robin (RR) specifies that all queues use round-robin
scheduling. It provides fair access to service a single packet at each
queue before moving on to the next one.
Weighted Round-Robin (WRR) operates by transmitting permitted
packets into the transmit queue in a round robin order. Initially, each
queue sets its weight to a configurable weighting. Every time a packet
from a higher priority CoS queue is sent, the corresponding weight is
subtracted by 1 and the packet in the next lower CoS queue will be
serviced. When the weight of a CoS queue reaches zero, the queue
will not be serviced until its weight is replenished. When weights of all
CoS queues reach 0, the weights get replenished at a time.
Weighted Deficit Round-Robin (WDRR) operates by serving an
accumulated set of backlogged credits in the transmit queue in a round
robin order. Initially, each queue sets its credit counter to a
configurable quantum value. Every time a packet from a CoS queue is
sent, the size of the packet is subtracted from the corresponding credit
counter and the service right is turned over to the next lower CoS
queue. When the credit counter drops below 0, the queue is no longer
serviced until its credits are replenished. When the credit counters of
all CoS queues reaches 0, the credit counters will be replenished at
that time. All packets are serviced until their credit counter is zero or
negative and the last packet is transmitted completely. When this
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