Specifications

Radio Interface
4-70 Advanced Configuration
– Support:WMMwillbeusedforanyassociateddevicethatsupportsthisfeature.Devices
thatdonotsupportthisfeaturemaystillassociatewiththeaccesspoint.
– Required:WMMmustbesupportedonanydevicetryingtoassociatedwiththeaccess
point.Devicesthatdonotsupportthisfeature
willnotbeallowedtoassociatewiththe
accesspoint.
• WMMBSSParameters–Theseparametersapplytothewirelessclients.
• WMMAPParameters–Theseparametersapplytotheaccesspoint.
– logCWMin(MinimumContentionWindow)–Theinitialupperlimitoftherandom
backoffwaittimebeforewirelessmediumaccess
canbeattempted.Theinitialwaittimeis
arandomvaluebetweenzeroandtheCWMinvalue.SpecifytheCWMinvalueinthe
range1‐15microseconds.NotethattheCWMinvaluemustbeequalorlessthanthe
CWMaxvalue.
– logCWMax(MaximumContentionWindow)–Themaximumupperlimit
oftherandom
backoffwaittimebeforewirelessmediumaccesscanbeattempted.Thecontention
windowisdoubledaftereachdetectedcollisionuptotheCWMaxvalue.Specifythe
CWMaxvalueintherange1‐15microseconds.NotethattheCWMaxvaluemustbe
greaterorequaltotheCWMinvalue.

– AIFS(ArbitrationInter‐FrameSpace)–Theminimumamountofwaittimebeforethenext
datatransmissionattempt.SpecifytheAIFSvalueintherange1‐15 microseconds.
– TXOPLimit(TransmitOpportunityLimit)–ThemaximumtimeanACtransmitqueue
hasaccesstothewirelessmedium.WhenanAC
queueisgrantedatransmitopportunity,
itcantransmitdataforatimeuptotheTxOpLimit.Thisdataburstinggreatlyimproves
theefficiencyforhighdata‐ratetraffic.Specifyavalueintherange0‐65535microseconds.
– AdmissionControl–Theadmissioncontrolmodefortheaccesscategory.Whenenabled,

clientsareblockedfromusingtheaccesscategory.(Default:Disabled)
Using the CLI to Configure WMM
Entertheinterfacewirelessmode,andtypewmmrequiredforclientsthatwanttoassociatewith
theaccesspoint.Thewmm‐acknowledge‐policycommandisusedtoenableordisablethe
acknowledgepolicyforeachaccesscategory. ThewmmparmscommanddefinesdetailedWMM
parameters.
Examples
RoamAbout 4102(if-wireless a)#wmm required
RoamAbout 4102(if-wireless a)#wmm-acknowledge-policy 0 noack
RoamAbout 4102(if-wireless a)#wmmparams ap 0 4 6 3 1 1
Toviewthe current802.11aradiosettingsforthedefaultinterface,usethe
showinterfacewirelessacommand.Toviewthecurrent802.11aradiosettingsforasepcificVAP
interface,usetheshowinterfacewirelessa<1‐7>command.
RBT4102-230.101#show interface wireless a
Wireless Interface Information
=========================================================================
----------------Identification-------------------------------------------
Description : WDS-link-a
SSID : SW-WDS
Channel : 48
Status : Enable