Major Traffic Control Techniques - H3C S5600 Series Operation Manual

Operation Manual – QoS-QoS Profile
H3C S5600 Series Ethernet Switches

1.1.4 Major Traffic Control Techniques

Figure 1-1 End-to-end QoS model
As shown in the figure above, traffic classification, traffic policing, traffic shaping,
congestion management, and congestion avoidance are the foundations for a network
to provide differentiated services. They are described as follow:
Traffic classification identifies traffic based on certain matching rules. It is a
prerequisite for differentiated services and is usually applied in the inbound
direction of a port.
Traffic policing confines traffic to a specific specification and is usually applied in
the inbound direction of a port. You can configure restriction or penalty measures
against the exceeding traffic to protect carrier benefits and network resources.
Traffic shaping adapts output traffic rate usually to the input capability of the
receiving device to avoid packet drop and port congestion. Traffic shaping is
usually applied in the outbound direction of a port.
Congestion management handles resource competition during network
congestion. Generally, it adds packets to queues first, and then forwards the
packets by using a scheduling algorithm. Congestion management is usually
applied in the outbound direction of a port.
Congestion avoidance monitors the use of network resources and drops packets
actively when congestion reaches certain degree. It relieves network load by
adjusting traffics. Congestion avoidance is usually applied in the outbound
direction of a port.
Traffic classification is the basis of all the above-mentioned traffic management
technologies. It identifies packets using certain rules and makes differentiated services
possible. Traffic policing, traffic shaping, congestion management, and congestion
avoidance are methods for implementing network traffic control and network resource
management. They are occurrences of differentiated services.
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Chapter 1 QoS Configuration