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4.6 Quality of Service
Quality of Service (QoS) is an advanced traffic prioritization feature that allows you to establish control over network
traffic. QoS enables you to assign various grades of network service to different types of traffic, such as multi-media, video,
protocol-specific, time critical, and file-backup traffic.
QoS reduces bandwidth limitations, delay, loss, and jitter. It also provides increased reliability for delivery of your data and
allows you to prioritize certain applications across your network. You can define exactly how you want the switch to treat
selected applications and types of traffic.
You can use QoS on your system to:
• Classifying traffic based on packet attributes.
• Assigning priorities to traffic (for example, to set higher priorities to time-critical or business-critical applications).
• Applying security policy through traffic filtering.
• Provide predictable throughput for multimedia applications such as video conferencing or voice over IP by
minimizing delay and jitter.
• Improve performance for specific types of traffic and preserve performance as the amount of traffic grows.
• Reduce the need to constantly add bandwidth to the network.
• Manage network congestion.
The QoS page of the Industrial PoE Switch contains three types of QoS mode - the 802.1p mode, DSCP mode or
Port-base mode can be selected. Both the three mode rely on predefined fields within the packet to determine the output
queue.
802.1p Tag Priority Mode –The output queue assignment is determined by the IEEE 802.1p VLAN priority tag.
IP DSCP Mode - The output queue assignment is determined by the TOS or DSCP field in the IP packets.
Port-Base Priority Mode – Any packet received from the specify high priority port will treated as a high priority
packet.
The Industrial PoE Switch supports two priority level queue, the queue service rate is based on the WRR(Weight Round
Robin) alorithm. The WRR ratio of high-priority and low-priority can be set to "4:1 and 8:1.
The screen in
Figure 4-39
shows the Quality of Service configuration page.
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User's Manual
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