User`s guide

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2.5 QOS
2.5.1 Understand QOS
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,
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 use QoS on your system to:
 Classifying traffic based on MAC addres/ 802.1p priority bits/ VLAN/ ports.
 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.
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 Switch then groups classified traffic in order to schedule them with
the appropriate service level.
DiffServ Code Point (DSCP) － is the 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 that will be 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 Switch will treat
certain types of traffic. Rules are associated with a QoS Profile (see above).
To implement QoS on your network, you need to carry out 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 Switch.
3: Create a QoS profile which associates a service level and a classifier.
4: Apply a QoS profile to a port(s).