Netgear GS724TS-100NAS User Manual download pdf (Page 127)

Chapter 4: Configuring Quality of Service | 127

4. Configuring Quality of Service

Use the features in the QoS tab to configure Quality of Service (QoS) settings on the switch. The

QoS tab contains links to the following features:

• Class of Service on page 128

• Differentiated Services on page 135

In a typical switch, each physical port consists of one or more queues for transmitting packets on

the attached network. Multiple queues per port are often provided to give preference to certain

packets over others based on user-defined criteria. When a packet is queued for transmission in

a port, the rate at which it is serviced depends on how the queue is configured and possibly the

amount of traffic present in the other queues of the port. If a delay is necessary, packets get held

in the queue until the scheduler authorizes the queue for transmission. As queues become full,

packets have no place to be held for transmission and get dropped by the switch.

QoS is a means of providing consistent, predictable data delivery by distinguishing between

packets that have strict timing requirements from those that are more tolerant of delay. Packets

with strict timing requirements are given “special treatment” in a QoS-capable network. With this

in mind, all elements of the network must be QoS-capable. The presence of at least one node

which is not QoS-capable creates a deficiency in the network path and the performance of the

entire packet flow is compromised.

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Netgear GS724TS-100NAS User Manual Page 127