1-3
Positions of the QoS Techniques in a Network
Figure 1-1
Positions of the QoS techniques in a network
As shown in
Figure 1-1
, traffic classification, traffic shaping, traffic policing, congestion management,
and congestion avoidance mainly implement the following functions:
z
Traffic classification uses certain match criteria to organize packets with different characteristics
into different classes. Traffic classification is the basis for providing differentiated services.
z
Traffic policing polices particular flows entering or leaving a device according to configured
specifications and can be applied in both inbound and outbound directions of a port. When a flow
exceeds the specification, some restriction or punishment measures can be taken to prevent
overconsumption of network resources.
z
Traffic shaping proactively adjusts the output rate of traffic to adapt traffic to the network resources
of the downstream device and avoid unnecessary packet drop and congestion. Traffic shaping is
usually applied to the outgoing traffic of a port.
z
Congestion management provides a resource scheduling policy to arrange the forwarding
sequence of packets when congestion occurs. Congestion management is usually applied to the
outgoing traffic of a port.
z
Congestion avoidance monitors the usage status of network resources and is usually applied to
the outgoing traffic of a port. As congestion becomes worse, it actively reduces the amount of
traffic by dropping packets.
Summary of Contents for S7906E - Switch
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