3Com 9100 manual Quality of Service QOS, Building Blocks

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QUALITY OF SERVICE (QOS)

	This chapter describes the concept of Quality of Service (QoS) and
	explains how to configure QoS on the switch.
Overview of	QoS is a feature of the Switch 9100 that allows you to specify different
Quality of Service	service levels for traffic traversing the switch. QoS is an effective control
	mechanism for networks that have heterogeneous traffic patterns. Using
	QoS, you can specify the service that a traffic type receives.
	The main benefit of QoS is that it allows you to have control over the
	types of traffic that receive enhanced service from the system. For
	example, if video traffic requires a higher priority than data traffic, using
	QoS you can assign a different QoS profile to those VLANs that are
	transmitting video traffic.
Building Blocks	The service that a particular type of traffic receives is determined by
	assigning a QoS profile to a traffic grouping or classification. The building
	blocks are defined as follows:
	■ QoS profile — Defines bandwidth and prioritization parameters.
	■ Traffic grouping — A method of classifying or grouping traffic that
	has one or more attributes in common.
	■ QoS policy — The combination that results from assigning a QoS
	profile to a traffic grouping.
	QoS profiles are assigned to traffic groupings to modify switch
	forwarding behavior. When assigned to a traffic grouping, the
	combination of the traffic grouping and the QoS profile comprise an
	example of a single policy that is part of Policy-Based QoS.