H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 20)

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IntServ model
The integrated service (IntServ) model is a multiple-service model that can accommodate diverse QoS
requirements. It provides the most granularly differentiated QoS by identifying and guaranteeing definite
QoS for each data flow.
In the IntServ model, an application must request service from the network before it sends data. IntServ
signals the service request with the Resource Reservation Protocol (RSVP). All nodes receiving the request
reserve resources as requested and maintain state information for the application flow.
The IntServ model demands high storage and processing capabilities because it requires all nodes along
the transmission path to maintain resource state information for each flow. The model is suitable for
small-sized or edge networks, but not large-sized networks, for example, the core layer of the Internet,
where billions of flows are present.
DiffServ model
The differentiated service (DiffServ) model is a multiple-service model that can satisfy diverse QoS
requirements. It is easy to implement and extend. DiffServ does not signal the network to reserve
resources before sending data, as IntServ does.
All QoS techniques in this document are based on the DiffServ model.
QoS techniques overview
The QoS techniques include traffic classification, traffic policing, traffic shaping, line rate, congestion
management, and congestion avoidance. The following sections briefly introduce these QoS techniques.
Applying QoS techniques in a network
Figure 3 Position of the QoS techniques in a network
As shown in Figure 3 , traffic classification, traffic shaping, traffic policing, congestion management, and
congestion avoidance mainly implement the following functions: