User guide

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9-5
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TTRIBUTES
Assigning QoS attributes is a three-step process which consists of defining three
interrelated QoS building blocks (defined below):
• Create a QoS profile.
QoS profile — A class of service that is defined through minimum and maximum
bandwidth parameters, configuration of buffering and RED, and prioritization
settings. The bandwidth and level of service that a particular type of traffic or
“traffic grouping” receives is determined by assigning it to a QoS profile.
• Assign one or more traffic groupings to a QoS profile to create a QoS policy.
Traffic grouping — A classification or traffic type that has one or more attributes in
common. These can range from a physical port to a VLAN to IP Layer 4 port
information. Traffic groupings are assigned to QoS profiles to modify switch
forwarding behavior. Traffic groupings transmitting out the same port that are
assigned to a particular QoS profile share the assigned bandwidth and prioritization
characteristics, and hence share the class of service.
QoS policy — The combination that results from assigning a traffic grouping to a
QoS profile.
• Monitor the performance of the application with the QoS monitor to determine
whether the policies are meeting the desired results.
The next sections describe each of these QoS components in detail.
Table 9- 1: Traffic Type and QoS Guidelines
Traffic Type Key QoS Parameters
Vo i c e Minimum bandwidth, priority
Video Minimum bandwidth, priority, buffering (varies)
Database Minimum bandwidth
Web browsing Minimum bandwidth for critical applications,
maximum bandwidth for non-critical applications,
RED
File server Minimum bandwidth