H3C H3C SR6600 Configuration Manual - Qos Techniques Overview

2-2 

The IntServ model demands high storage and processing capabilities, because it requires that all nodes 

along the transmission path 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.  

For more information about RSVP, see MPLS TE in the MPLS Configuration Guide.  

DiffServ Model 

The differentiated services (DiffServ) model is a multiple-service model that can satisfy diverse QoS 

requirements. Unlike IntServ, DiffServ does not require an application to signal the network to reserve 

resources before sending data. DiffServ is easy to implement and extend.  

All QoS techniques in this document are based on the Diff-Serv model.  

QoS Techniques Overview 

The QoS techniques fall into traffic classification, traffic policing, traffic shaping, line rate, congestion 

management, and congestion avoidance. The following part briefly introduces these QoS techniques.  

Applying QoS Techniques in a Network 

Figure 2-1 

Position of the QoS techniques in a network 

As shown in 

Figure 2-1

, traffic classification, traffic shaping, traffic policing, congestion management, 

and congestion avoidance mainly implement the following functions: 

z

Traffic classification uses certain match criteria to assign packets with the same characteristics to a 

class. Based on classes, you can provide differentiated services.