QoSTh series suppo tures listed in Table 45-1Supported By Switch 4500 Seriese Switch 4500 rt the QoS fea :Table 45-1 QoS fea 00 seriestures supported by Switch 45QoS Feature Description Refer to …Trafficclassificationtraffic based4500ollowingACLsz efer to theACL Operation and ACL Commandmanuals.Classify incomingon ACLs. The Switchseries support the ftypes of ACLs:For information about ACLs, rz Basic ACLsz Advanced ACLsz Layer-2 ACLsz User-definedz For information about traffic classification,refer to Traffic Classification.The Switch 4500 series supporting QoSatching thez For information about priority marking,refer toperforming the follow Priority Markingactions for packets m.z For information about traffic policing, refertospecified ACL: Traffic Policing.z Priority markingz Traffic policingz VLAN Mappingz For information about VLAN Mapping,refer to VLAN Mapping.z For information about traffic mirroring,refer to Traffic mirroringz Traffic mirroring .QoS actions required on theeries:ity trust modez Protocol packet priorityz ation about priority trust mode,refer toFor informYou can configure the following Priority Trust ModeQoS actions aSwitch 4500 s.For information abz out specifying priorityfor protocol packets, refer to Protocolz Prior Priority.z For information about line rate, refertoLine Ratez Line rate .CongestionavoidanceFor information about congestion avoidanceand WRED, refer to Congestion AvoidanceWRED .Congestionmanagementries support, and WRR queuealgorithms andfollowing five queuees:z WFQz WRRFor information about SP, WFQ, and WRR,refer to Queue SchedulingThe Switch 4500 seSP, WFQschedulingsupport thescheduling modz SP .z SP+WFQz SP+WRRIntroTraffiduction to QoS Functionsc ClassificationTraffic here refers to service traffic; that is, all the packets passing the switch.Traffic classification means identifying packets that conform to certain characteristics according tocertain rules. It is the foundation for providing differentiated services.In traffic classification, the priority bit in the type of service (ToS) field in IP packet header can be used toidentify packets of different priorities. The network administrator can also define traffic classificationpolicies to identify packets by the combination of source address, destination address, MAC address, IP45-3
