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Руководство пользователя. Версия 2.0 Страница: 583

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [583/741] 172936

ConfiguringAdvancedSettings

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page583

D‐LinkUWSUserManual

TunnelIPMTUSize SelectthemaximumsizeofanIPpackethandledbythenetwork.TheMTUis

enforcedonlyontunneledVAPs.

WhenIP packetsaretunneledbetweentheAPsandtheDWS‐4000Seriesswitch,the

packetsizeisincreasedby20bytesduringtransit.Thismeansthatclientsconf

igured

for1500byteIPMTUsizemayexceedthemaximumMTUsizeofexistingnetwork

infrastructurewhichissetuptoswitchandroute1518(1522‐tagged)byteframes.If

youincreasethetunnelIPMTUsize,youmustalsoincreasethephysicalMTUofthe

portsonwhichthetr

afficflows.

Note:fanyofthefollowingconditionsaretrue,youdonotneedtoincreasethe

tunnelIPMTUsize:

•ThewirelessnetworkdoesnotuseL3tunneling.

•Thetunnelingmodeisusedonlyforvoicetraffic,whichtypicallyhassmall

packets.

•ThetunnelingmodeisusedonlyforTC

Pbasedprotocols,suchasHTTP.Thisis

becausetheAPautomaticallyreducesthemaximumsegmentsizeforallTCP

connectionstofitwithinthetunnel.

ClusterPriority Specifythepriorityofthisswit chfortheClusterControllerelection.

TheswitchwithhighestpriorityinaclusterbecomestheClusterController.Ifthe

priorityisthesamefo

rallswitches,thentheswitchwithlowestIPaddressbecomes

theClusterController.Apriorityof0meansthattheswitchcannotbecomethe

ClusterController.Thehighestpossiblepriorityis255.

APClientQoS EnableordisabletheclientQoSfeature.IfAPClientQoSisdi

sabled,theClientQoS

configurationremainsinplace,butanyACLsorDiffServpoliciesappliedtowireless

trafficarenotenforced.

TheClientQoSfeatureextendstheprimaryQoScapabilitiesoftheDWS‐4000Series

switchtothewirelessdomain.Morespecifically,accesscontrollists(ACLs)and

differentiatedservice(Dif

fServ)policiesareappliedtowirelessclientsassociatedto

theAP.

TSPECViolationReport

Interval

ATSPECisatrafficspecificationthatissentfromaQoS‐capablewirelessclienttoan

APrequestingacertainamountofnetworkaccessforthetrafficstream(TS)it

represents.

TheTSPECViolationReportIntervals

pecifiesthenormalfrequencywithwhich

wirelessclientsdetectedasusingadmission‐controlledresourceswithoutproper

TSPECauthorizationarereportedthroughsystemloggingandSNMPtraps.

Ifaviolatingclientdisassociatesbeforethenextreportinginterval,itisreportedupon

disassociation.

Settingthisparameterto0disablesTSPECviolationreporting.

BaseIPPo

rt SetsthefirstIPportnumberwithintherangethatthewirelesssystemusestosend

andreceiveIPtraffic.

BydefaulttheWirelesssystemusestheIPports57775to57784.

IfyouchangethebaseIPport,thewirelessfeatureisautomaticallydisabledandre‐

enabled.ThedefaultWi

relessIPportisnotsentaspartoftheglobalswitch

configurationintheclusterconfigurationdistributioncommand,soeveryswitchin

theclustermustbeconfiguredindependentlywiththenewIPportnumber.

IftheWirelessIPportnumberischangedfromitsdefaultvalueontheswitch,thenit

stalsobechangedontheAccessPoints.TheportcanbesetontheAPviaanAP

administrativecommand,orDHCPoption43,sub‐option3.IftheportissetviaDHCP

thentheDHCPsettingsupersedestheconfiguredsetting.

Table346:GeneralGlobalConfigurations

Field Description

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [583/741] 172936

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