H3C S5500-SI Series Operation Manual

Also see for S5500-SI Series: Configuration Operation manual Configuration guide Configuration guide Configuration guide

Operation Manual – QoSH3C S5500-SI Series Ethernet Switches Chapter 1 QoS Overview1-4taken to protect the business interests and network resources of the operator frombeing damaged.z Congestion management: Congestion management is necessary for solvingresource competition. Congestion management is generally to cache packets inthe queues and arrange the forwarding sequence of the packets based on acertain scheduling algorithm.z Congestion avoidance: Excessive congestion will impair the network resources.Congestion avoidance is to supervise the network resource usage. When it isfound that congestion is likely to become worse, the congestion avoidancemechanism will drop packets and regulate traffic to solve the overload of thenetwork.z TS: TS is a traffic control measure to regulate the output rate of the traffic actively.TS regulates the traffic to match the network resources that can be provided by thedownstream devices so as to avoid unnecessary packet loss and congestion.Among the traffic management techniques, traffic classification is the basis because itidentifies packets according to certain match rules, which is the prerequisite ofproviding differentiated services. TP, TS, congestion management, and congestionavoidance control network traffic and assigned resources from different approaches,and are the concrete ways of providing differentiated services.S5500-SI Series Ethernet Switches support the following functions:z Traffic classificationz Access controlz TPz Congestion management1.5.1 Traffic ClassificationTraffic classification is to identify packets conforming to certain characters according tocertain rules. It is the basis and prerequisite for proving differentiated services.A traffic classification rule can use the precedence bits in the type of service (ToS) fieldof the IP packet header to identify traffic with different precedence characteristics. Atraffic classification rule can also classify traffic according to the traffic classificationpolicy set by the network administrator, such as the combination of source addresses,destination addresses, MAC addresses, IP protocol or the port numbers of theapplications. Traffic classification is generally based on the information in the packetheader and rarely based on the content of the packet. The classification result isunlimited in range. They can be a small range specified by a quintuplet (source address,source port number, protocol number, destination address, and destination portnumber), or all the packets to a certain network segment.Generally, the precedence of bits in the ToS field of the packet header is set whenpackets are classified on the network border. Thus, IP precedence can be used directlyas the classification criterion inside the network. Queue techniques can also process

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