Netgear GS724Tv3 GS716Tv2/GS724Tv3 Software Admin Manual - Page 119
Configuring Quality of Service, Configuring Class of Service
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Chapter 4 Configuring Quality of Service This section gives an overview of Quality of Service (QoS) and explains the QoS features available from the Quality of Service navigation tree menu. This section contains the following subsections: • "Configuring Class of Service" on page 4-1 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. Configuring Class of Service The Class of Service (CoS) queueing feature lets you directly configure certain aspects of switch queueing. The priority of a packet arriving at an interface can be used to steer the packet to the appropriate outbound CoS queue through a mapping table. CoS queue characteristics that affect queue mapping, such as minimum guaranteed bandwidth, or transmission rate shaping are userconfigurable at the queue (or port) level. Four queues per port are supported. The Class of Service folder contains links to the following features: • "Basic CoS Configuration" on page 4-2 • "CoS Interface Configuration" on page 4-3 4-1 v1.0, July 2009