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Chapter 4: Web configuration
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NS3562-8P-2S User Manual
• Click
Delete
to delete the MLD profile entry in the Port Filter Status page.
Quality of Service (QoS)
Understanding QoS
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.
To implement QoS on a network, perform the following actions:
1. Define a service level to determine the priority that will be applied to traffic.
2. Apply a classifier to determine how the incoming traffic will be classified and thus
treated by the industrial managed switch.
3. Create a QoS profile that associates a service level and a classifier.
4. Apply a QoS profile to a port(s).
The QoS page of the industrial managed switch contains three types of QoS mode, all
of which rely on predefined fields within the packet to determine the output queue:
•
802.1p Tag Priority
–
The output queue assignment is determined by the IEEE
802.1p VLAN priority tag.
•
IP DSCP
–
The output queue assignment is determined by the TOS or DSCP field
in the IP packets.