ZyXEL GS-1548 User Guide - Page 67

QoS, 11.1 QoS Overview, 11.1.1 Weighted Round Robin (WRR)

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CHAPTER 11 QoS This chapter introduces the quality of service (QoS) parameters you can configure on the Switch. 11.1 QoS Overview QoS is used to help solve performance degradation when there is network congestion. Use the QoS Setting screen to configure queuing algorithms for outgoing traffic. Queuing algorithms allow switches to maintain separate queues for packets from each individual source or flow and prevent a source from monopolizing the bandwidth. 11.1.1 Weighted Round Robin (WRR) Round Robin scheduling services queues on a rotating basis and is activated only when a port has more traffic than it can handle. A queue is given an amount of bandwidth irrespective of the incoming traffic on that port. This queue then moves to the back of the list. The next queue is given an equal amount of bandwidth, and then moves to the end of the list; and so on, depending on the number of queues being used. This works in a looping fashion until a queue is empty. Weighted Round Robin (WRR) scheduling uses the same algorithm as round robin scheduling, but services queues based on their priority and queue weight (the number you configure in the queue Weight field) rather than a fixed amount of bandwidth. WRR is activated only when a port has more traffic than it can handle. Queues with larger weights get more service than queues with smaller weights. This queuing mechanism is highly efficient in that it divides any available bandwidth across the different traffic queues and returns to queues that have not yet emptied. GS-1524/GS-1548 User's Guide 67

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GS-1524/GS-1548 User’s Guide
67
C
HAPTER
11
QoS
This chapter introduces the quality of service (QoS) parameters you can configure
on the Switch.
11.1
QoS Overview
QoS is used to help solve performance degradation when there is network
congestion. Use the
QoS Setting
screen to configure queuing algorithms for
outgoing traffic.
Queuing algorithms allow switches to maintain separate queues for packets from
each individual source or flow and prevent a source from monopolizing the
bandwidth.
11.1.1
Weighted Round Robin (WRR)
Round Robin scheduling services queues on a rotating basis and is activated only
when a port has more traffic than it can handle. A queue is given an amount of
bandwidth irrespective of the incoming traffic on that port. This queue then moves
to the back of the list. The next queue is given an equal amount of bandwidth, and
then moves to the end of the list; and so on, depending on the number of queues
being used. This works in a looping fashion until a queue is empty.
Weighted Round Robin (WRR) scheduling uses the same algorithm as round robin
scheduling, but services queues based on their priority and queue weight (the
number you configure in the queue
Weight
field) rather than a fixed amount of
bandwidth. WRR is activated only when a port has more traffic than it can handle.
Queues with larger weights get more service than queues with smaller weights.
This queuing mechanism is highly efficient in that it divides any available
bandwidth across the different traffic queues and returns to queues that have not
yet emptied.