Qos Techniques - HP 5830 Series Configuration Manual

QoS techniques

The QoS techniques include traffic classification, traffic policing, traffic shaping, rate limit, congestion
management, and congestion avoidance. The following section briefly introduces these QoS techniques.
Figure 3 Position of the QoS techniques in a network
As shown in
congestion avoidance mainly implement the following functions:
Traffic classification uses certain match criteria to assign packets with the same characteristics to a
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class. You can provide differentiated services based on classes.
• Traffic policing polices flows entering or leaving a device, and imposes penalties on traffic flows
that exceed the preset threshold to prevent aggressive use of network resources. You can apply
traffic policing to both incoming and outgoing traffic of a port.
To eliminate packet drops, traffic shaping proactively adapts the output rate of traffic to the network
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resources available on the downstream device. Traffic shaping usually applies to the outgoing
traffic of a port.
Congestion management provides a resource scheduling policy to determine the packet forwarding
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sequence when congestion occurs. Congestion management usually applies to the outgoing traffic
of a port.
• Congestion avoidance monitors the network resource usage and is usually applied to the outgoing
traffic of a port. When congestion worsens, congestion avoidance reduces the queue length by
dropping packets.
Figure 3, traffic classification, traffic shaping, traffic policing, congestion management, and
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