QoS

This chapter describes the implementation principle of class-based QoS, and configuration methods of traffic management, interface-based rate limit, traffic shaping, priority mapping, and congestion management. The S2700SI switches do not support the QoS function.

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.
• Interface-based Rate Limit
  The interface-based rate limit technology limits the rate of incoming and outgoing packets of an interface.
• Traffic Shaping
  Traffic shaping is also called queue 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. The S2710SI-52P, S2700EI or S2700EI-52P switches do not support this function.
• Priority Mapping
  You can configure priority mappings and trusted interfaces. The S2710SI-52P, S2700EI or S2700EI-52P switches do not support this function.