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Chapter 4: Web configuration
Quality of Service (QoS)
QoS overview
Quality of Service (QoS) is an advanced traffic prioritization feature that allows you to
establish control over network traffic. QoS permits the assignment of 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 data and permits prioritization of certain applications across the
network. You can define exactly how you want the switch to treat selected applications
and types of traffic. Use QoS on the system to control a wide variety of network traffic
functions by:
•
Classifying traffic based on packet attributes.
•
Assigning priorities to traffic (for example, setting higher priorities for time-critical or
business-critical applications).
•
Applying security policy through traffic filtering.
•
Providing predictable throughput for multimedia applications such as video
conferencing or voice over IP by minimizing delay and jitter.
•
Improving performance for specific types of traffic and preserving performance as
the amount of traffic grows.
•
Reducing the need to constantly add bandwidth to the network.
•
Managing network congestion.
The QoS page of the PoE web smart switch contains three types of QoS modes. All
three modes rely on predefined fields within the packet to determine the output queue.
•
First-In-First-Out Mode – The output queue assignment is determined with first-
come, first-served (FCFS) behavior.
•
All-High-before-Low Mode - The output queue assignment is determined by the
ToS or CoS field in the packets with strict priority.
•
Weighted-Round-Robin Mode - The output queue assignment is determined by
the ToS or CoS field in the packets with scheduling discipline policy.
The PoE web smart switch supports eight priority level queues; the queue service rate
is based on the WRR (Weight Round Robin). The WRR ratio of high-priority and low-
priority can be set to 4:1, 8:1, or any.
Priority mode
Set priority mode on the Priority Mode page.
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ES2402-24P-2C / ES2402-16P-2C / ES2402-8P-2C User Manual
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