cisco-wlc环境下的airplay

EnterpriseandApplehavethislove/haterelationship.EndusersloveApple.ITtendstobehesitantinsupportingtheawesomefeaturestheycomewith.AirPlayisprobablythemostrequestedfeature.Ciscodidn’tofficiallysupportBonjourandAirPlayuntilversion7.4intheWirelessLANController.ThelatestrevisionshaveimprovementsinsupportingBonjourandespeciallyintheconfiguration.InthispostIwilldiscussconfigurationontheCiscoWLCversion7.6.100.0.WhatconfigurationisneededonyourswitchesandhowyoucanverifyBonjourisworking.We’llgetitworkingfordevicesonthesamesubnetandacrossdifferentsubnets,bothwiredandwireless.IwasabletotestthiswithmultipleiPadsandahandfulofiPhones.With3rdpartysoftwareIwasabletousemyWindows8laptoptoAirPlaymyscreentoanAppleTV.Nolagorjitterwasencounteredduringmytests.Tobefair,Idonothavealotofusershittingthewirelessnetworktoreallyseeanyperformancehits.BeforeconfiguringBonjour,Iperformedawirelesssitesurveyandmadeadjustmentstoprovidepropercoverageforconnectivityandensuredtherewasnointerference.CiscoWirelessLANControllerRequirementsToallowBonjourtotraversethewirelessnetworktherewillneedtobesomefeaturesenabled:mDNSBroadcastforwardingMulticastIGMPsnoopingBroadcastForwardingWithintheCiscoWLCinterface,clickonControllerandensureyou’reintheGeneralsection.Fromthissection,ensureBroadcastForwardingisEnabled.Thiswasrequiredbyoneofourvendors.WeuseSavantAVequipmentandtomanagethosedevices,andtoalsoallowBonjour,wehadtoenablethisfeature.ThisisaglobalfeatureofthewirelessLANcontroller.Additionally,changetheAPMulticastModetoMulticastandsetamulticastaddress.Whenselectingamulticastaddress,pickonefromtheprivatemulticastaddressspace.ClickforalargerimageOntheleftpane,expandmDNSandclickonGeneral.Inthiswindow,enablemDNSGlobalSnooping.TheCiscoWLCwillenablesomeservicesforyou.DependingonyourneedsforBonjour,you’lleitheraddorremoveservices.Toaddaservice,clickonthedropdownfor“SelectService”,selecttheservicerequired,enableQueryStatus,andthenclickAdd.Toremoveanexistingservice,hoveryourmouseoverthebluearrowiconandselectRemove.EnablingmDNS–ClickforLargerImageMovingontoDomainNamesyouwillseealistofentriesfromdevicescurrentlycommunicatingviaBonjour.Seeingdevicesinthissectionisagoodsign.ClickforLargerNoticethe“Type”column.Initially,youprobablywillseeonlyWirelessdevices.InordertoseeWireddevicesyoumustcreateaninterfaceontheWLCwithineachsubnetneedingaccesstoBonjourservices.WithinthatinterfaceconfigurationthemDNSProfileshouldalsobeselected.CreatinganInterfaceinthewiredsubnetSetthemDNSProfilefortheInterfaceAnotherlocationtoconfigurethemDNSProfileiswithintheWLANAdvancedSettings.EnabledthemDNSprofilefortheWLAN.mDNSBrowserisahandytooltoviewwhatthecontrollercanfindonthenetworkandwhatservicestringtheyareusing.SwitchConfigurationFirstfeaturethatmustbeenabledismulticast.Usethiscommandonyourswitchtoenablemulticast:ipmulticast-routingNextconfigurationitemistoentertheVLANinterfaceandconfigurethesparsemode:interfacevlanvlan-idippimsparse-modeThemaincommandisippimsparse-mode.WhatthiscommanddoesisallowtheSVItojoininsparsemodemulticasttraffic.TheclientsinthatVLANwillbeabletoreceivemulticasttrafficfromdifferentmulticastgroups.Sparsemodeusesapullmodeltodelivermulticasttraffic.YoucanreadmoreaboutSparseModeandtheothermodesonCisco.com:PIM-SMusesapullmodeltodelivermulticasttraffic.Onlynetworksegmentswithactivereceiversthathaveexplicitlyrequestedthedatawillreceivethetraffic.PIM-SMdistributesinformationaboutactivesourcesbyforwardingdatapacketsonthesharedtree.BecausePIM-SMusessharedtrees(atleast,initially),itrequirestheuseofarendezvouspoint(RP).TheRPmustbeadministrativelyconfiguredinthenetwork.SourcesregisterwiththeRPandthendataisforwardeddownthesharedtreetothereceivers.TheedgerouterslearnaboutaparticularsourcewhentheyreceivedatapacketsonthesharedtreefromthatsourcethroughtheRP.TheedgerouterthensendsPIM(S,G)joinmessagestowardsthatsource.EachrouteralongthereversepathcomparestheunicastroutingmetricoftheRPaddresstothemetricofthesourceaddress.Ifthemetricforthesourceaddressisbetter,itwillforwardaPIM(S,G)joinmessagetowardsthesource.IfthemetricfortheRPisthesameorbetter,thenthePIM(S,G)joinmessagewillbesentinthesamedirectionastheRP.Inthiscase,thesharedtreeandthesourcetreewouldbeconsideredcongruent.AfterconfiguringthesparsemodefortheSVI,wenowenableIGMPsnoopingontheswitchwiththiscommand:ipigmpsnoopingvlanvlan-idVerifyIGMPsnoopingwith:showipigmpsnoopingSDG01-SVRM-CSW-3750-01#showipigmpsnoopingGlobalIGMPSnoopingconfiguration:-----------------------------------IGMPsnooping:EnabledIGMPv3snooping(minimal):EnabledReportsuppression:EnabledTCNsolicitquery:DisabledTCNfloodquerycount:2LastMemberQueryInterval:1000Vlan1:--------IGMPsnooping:EnabledIGMPv2immediateleave:DisabledExplicithosttracking:EnabledMulticastrouterlearningmode:pim-dvmrpLastMemberQueryInterval:1000CGMPinteroperabilitymode:IGMP_ONLYCommandsusedtoverifymDNSontheCiscoWLC:showmdnsprofilesummaryshowmdnsprofiledetailprofile-nameshowmdnsservicesummaryshowmdnsservicedetailservice-nameshowinterfacedetinterface-nameshowinterfacegroupdetailinterface-group-namesho