Operation Manual – QoSH3C S3610&S5510 Series Ethernet SwitchesChapter 2 Traffic Classification, TP, and TSConfiguration2-7traffic of a certain connection is excess, TP can choose to drop the packets or to resetthe priority of the packets.TP is widely used in policing the traffic into the network of internet service providers(ISPs). TP can classify the policed traffic and perform pre-defined policing actionsbased on different evaluation results. These actions include:z Forwarding conforming packets or non-conforming packets.z Dropping conforming or non-conforming packets.z Marking a conforming packet with a new 802.1p precedence value and forwardingthe packet.z Marking a conforming packet with a new IP precedence value and forwarding thepacket.z Marking a conforming packet or a non-conforming packet with a new DSCPprecedence value and forwarding the packet.2.3.5 TSTS is a policy used to adjust the rate of outbound traffic actively. A typical TSimplementation is to control outbound traffic according to the traffic control settings ofthe downstream network nodes.The difference between TP and TS lies in that when traffic exceeds the set threshold,TP drops packets and TS caches packets or add packets to queues, as shown in Figure2-5. Cached packets are sent at an even rate only when there are enough tokens in thetoken bucket. Another difference between the two is that TS results in additional delayand TP seldom does.TokenbucketDropPacketclassificationPackets to be sentthrough this portContinueto sendPut tokens in the bucket at theset rateQueueFigure 2-5 Diagram for TSFor example, assume that Switch A sends packets to Switch B. Switch B performs TPfor packets from Switch A. Packets exceeding the set threshold are simply dropped.
