Specifications

About QoS
12-4 Configuring Quality of Service
WMM QoS Mode
RoamAboutSwitchesand R oamAboutaccesspointseachprovideclassificationandmarkingfor
WMMQoS:
•RoamAboutSwitchesclassifyandmarktrafficbasedon802.1ptagvalue(fortaggedtraffic)or
DifferentiatedServicesCodePoint(DSCP)value.
•RoamAboutaccesspointsclassifyingresstrafficfromwirelessclientsbasedontheservice
typevaluein
the802.11header,andmarktheDSCPvalueintheIPtunnelonwhichtheAP
forwardstheusertraffictotheswitch.
APsplacetrafficfromaRoamAbou tSwitchtoawirelessclientinaforwardingqueuebased
ontheDSCPvalueinthetunnelcarryingthetraffic,thenforward
thetrafficbasedonthe
queue’spriority.
Figure 12‐1onpage 12‐5showshowRoamAboutSwitchesclassifyingresstraffic.Figure 12‐2on
page 12‐6showshowRoamAboutSwitchesmarkegresstraffic.Figure 12‐3onpage 12‐7and
Figure 12‐4onpage 12‐8showhowAPsclassifyingresstrafficandmarkegress
traffic.Thefigures
showthedefaultmappingsbetweenDSCPandCoS.
ForinformationaboutchangingCoSmappings,see“ChangingCoSMappings”onpage 12‐17.