Chapter 4: Web configuration
NS3552-8P-2S-V2 User Manual 173
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.
QoS terminology
• Classifier – Classifies the traffic on the network. Traffic classifications are
determined by protocol, application, source, destination, and so on. You can create
and modify classifications. The industrial managed switch then groups classified
traffic in order to schedule them with the appropriate service level.
• DiffServ Code Point (DSCP) – Traffic prioritization bits within an IP header that are
encoded by certain applications and/or devices to indicate the level of service
required by the packet across a network.
• Service Level – Defines the priority given to a set of classified traffic. You can
create and modify service levels.
• Policy – Comprises a set of rules that are applied to a network so that a network
meets the needs of the business. That is, traffic can be prioritized across a network
according to its importance to that particular business type.
• QoS Profile – Consists of multiple sets of rules (classifier plus service level
combinations). The QoS profile is assigned to a port(s).
• Rules – Comprises a service level and a classifier to define how the industrial
managed switch will treat certain types of traffic. Rules are associated with a QoS
profile.
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.
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