QoS

This chapter describes the implementation principle of class-based QoS, and configuration methods of traffic management, rate limiting, traffic shaping, and congestion management.

By matching packets with the rules, the class-based QoS technology groups the packets sharing common features into one class and provides the same QoS level for traffic of the same type. In this manner, the class-based QoS technology provides differentiated services.

• Traffic Management
  The following sections describe the configuration methods of class-based QoS traffic management, including the configurations of the traffic classifier, traffic behavior, traffic policy, and application of the traffic policy.
• Rate Limiting
  The rate limiting technology limits the rate of incoming and outgoing packets of an interface.
• Traffic Shaping
  Traffic shaping is also called queue shaping and interface shaping. The queue shaping technology limits traffic in a defined range by setting the shaping rate of packets of the entire queue. This prevents downstream traffic congestion.
• Congestion Management
  To ensure that delay-sensitive services have higher QoS level than non-delay-sensitive services, you can perform congestion management when temporary congestion occurs or increase bandwidth when the network is always congested. Congestion management technology sends flows of packets in queues by using queue scheduling technologies and scheduling algorithms.