1-4QoS Feature Description ReferenceYou can configure the followingQoS actions for traffic separatelyas required on the S5100 series:z Priority trust modez Protocol packet priorityz Line rate (available only on theS5100-SI)z Burstz For information about prioritytrust mode, refer to PriorityTrust Mode.z For information aboutspecifying priority for protocolpackets, refer to ProtocolPriority.z For information about linerate, refer to Line Rate.z For information about theburst function, refer to Burst.CongestionmanagementThe S5100 series support SP,WRR, and SDWRR for queuing andsupport the following three queuescheduling modes:z SPz SDWRRz SP+SDWRRFor information about SP, WRR,and SDWRR, refer to QueueScheduling.Introduction to QoS FeaturesTraffic ClassificationTraffic here refers to service traffic, that is, all the packets passing by the switch.Traffic classification identifies packets conforming to certain characteristics according tocertain criteria. It is the foundation for providing differentiated services.In traffic classification, the priority bits in the type of service (ToS) field in the IP header canbe used to identify packets of different priorities. You can also define traffic match criteriato classify packets by the combination of source address, destination address, MACaddress, IP protocol or the port number of an application. Contents other than the headerinformation in packets are rarely used for traffic classification. You can define a class forpackets with the same quintuple (source address, source port number, protocol number,destination address and destination port number for example), or for all packets to acertain network segment.Priority Trust ModeIntroduction to precedence types1) IP precedence, ToS precedence, and DSCP
