V4ACITDM-MLD-snooping-lilian

,H-release(ACI4.1)MLDSnooping,MLDSnoopingFeatureOverview,MulticastListenerDiscovery(MLD)overview,MLDistheprotocolusedbythenetworkingdevicetodiscoverthepresenceofipv6capablemulticastlisteners(i.e.hostsinterestedtoreceiveipv6multicastpackets)onitsdirectlyattachedlinks,andtodiscoverspecificallywhichipv6multicastgroupsareofinteresttothosehostsMLDforIPv6isfunctionallysimilartoInternetGroupManagementProtocol(IGMP)forIPv4MLDmessagetypesareasubsetoftheICMPv6messages,andMLDmessagesareidentifiedinIPv6packetsbyaprecedingNext-Headervalueof58AllMLDmessagesaresentwithalink-localIPv6SourceAddress,anIPv6HopLimitof1,andanIPv6RouterAlertoptioninaHop-by-HopOptionsheader,MLDv1overview,TherearethreetypesofMLDv1messages:MLDversion1isbasedonversion2ofIGMPforIPv4MulticastListenerQuery(icmpv6type=130)TherearetwosubtypesofMulticastListenerQuerymessages:-GeneralQuery(GQ),usedtolearnwhichmulticastgroupaddresseshavelistenersonanattachedlinkMulticast-Group-SpecificQuery(GSQ),usedtolearnifaparticularmulticastgroupaddresshasanylistenersonanattachedlinkMulticastListenerReport(icmpv6type=131)MulticastListenerDone(icmpv6type=132),MLDv2overview,MLDversion2isbasedonversion3ofIGMPforIPv4MLDv2addstheabilityforanodetoreportinterestinlisteningtopacketswithaparticularmulticastaddressonlyfromspecificsourceaddressesorfromallsourcesexceptforspecificsourceaddresses.SimilartoMLDv1,TherearethreetypesofMLDv2messages:MulticastListenerQuery(icmpv6type=130)TherearetwosubtypesofMulticastListenerQuerymessages:GeneralQuery(GQ),usedtolearnwhichmulticastgroupaddresseshavelistenersonanattachedlinkMulticast-Group-SpecificQuery(GSQ),usedtolearnifaparticularmulticastgroupaddresshasanylistenersonanattachedlinkMLDv2MulticastListenerReport(icmpv6type=143)MulticastListenerDone(icmpv6type=132),MLDSnoopingOverview,MLDsnoopingisaperbridgedomain(BD)feature.ItdefineshowaleafswitchforwardsIPv6multicastpacketswithinaBD.WhenMLD-SnoopingisdisabledinaBD,allIPv6multicasttrafficarefloodedonallportsinallEPGswithintheBD.WhenMLD-SnoopingisenabledinaBD,knownIPv6multicasttrafficisforwardedONLYonportsintheBDwherefabrichasreceivedinterestviaMLDreports.UnknownIPv6multicasttrafficisforwardedinaccordancewithconfiguredforwardingmodeFloodorOptimized-Flood(OMF).Infloodmode,unknownIPv6multicasttrafficisfloodedtoallports/EPGswithintheBD.InOMFmode,unknownIPv6multicasttrafficisforwardedtomulticastrouterports.,Whenaleafreceivesmulticastpacketsfromalocallyattachedendpoint,itreplicatesandforwardsthepacketstoitsotherlocalportsintheBDbasedontheBDMLDsnoopingconfiguration.Additionally,italwaysforwardsonecopytothespinethatistheFTAGrootfortheBDGIPo.ThespinesendsonecopytoeachofotherleafsintheBDandtheleafthathasexternalMLDquerierormrouterconnected.Uponreceivingthepacketfromthespine,eachotherleafdoesitslocalmcastforwardingbasedontheBDMLDsnoopingconfiguration.WhenMLDsnoopingisdisabledinaBD,aleafforwardsthemulticastpacketstoallitslocalportsinthesameBD.,IPv6MulticastForwardinginaBD,IPv6MulticastForwardinginaBD(Conted),WhenMLDsnoopingisenabledforaBD:Eachleafreplicatesandforwardsknownmcasttraffictoitshostportsthathavereceiversinthemcastgroup.Ifthemcastgroupisunknowtoaleaf,i.e.theleafhasntlearnedanyreceiversforthisgrouponanyofitslocalhostports,itsforwardingbehaviorwilldependontheconfigurationforIPv6L3unknownmcastintheBDMLDsnoopingpolicy:IfitsFlood,theleafwillsendthepacketstoallitslocalhostportsintheBD.IfitsOptimizedFlood,theleafonlywillnotsendthepacketstoanyofitslocalhostports,exceptforthemrouterports(onwhichtheleafreceivedMLDqueries).(Ineithercase,aleafwillalwayssendacopytothespineandacopytoeachofitslocalMLDquerier/mrouterports.),FeatureLimitations&Caveats,MLDSnoopingrequiresGen-2ornewerleafswitches.L3multicastroutingacrossBD/VRFisnotsupportedforIPv6multicasttrafficSupportupto2000IPv6multicastgroupstobesnoopedacrossthefabricConfigurationofstaticMLDsnoopingentrynotsupportedAccessfilterforMLDsnoopentriesviaroutemapisnotsupportedVirtualendpointsbehindtheVTEPs(VL)isnotsupportedinACI4.1releaseMulti-sitesupportisnotverifiedinACI4.1releaseEvenforthesourcespecificsnoopentrywithMLDv2,thehardwareforwardinghappenswith(*,G)lookup,MLDSnoopingGUIConfiguration,ConfiguringMLDSnoopingPolicyDuringBDCreation,MLDSnoopingisaconfigurationattributeforBD.ItcanbeconfiguredduringcreationofaBD.,MLDSnoopingCanbeConfiguredforExistingBD,Alternatively,MLDSnoopingcanbeconfiguredforanexistingBDunderPolicy-General,TheDefaultMLDSnoopingPolicy,Note:MLDsnoopingisdisabledinthedefaultpolicy.,ConfiguringMLDSnoopingPolicy,MLDsnoopingpolicycanbecreatedduringBDcreation/configuration.Also,userscancreateMLDsnoopingpoliciesunderTenant-Policies-MLDSnooping.,CreatingaPolicytoEnableMLDSnooping,Bydefault,MLDsnoopingisdisabled.NeedtoenableitsadminstateinaMLDsnoopingpolicy,CanselectivelyenableFastleavebehavior,and/orquerier.,EnableSwitchQuerierinMLDSnoopingPolicy,WhenquerierisenabledintheMLDsnoopingpoicyforaBD,allleafswitcheswillsendoutMLDqueriesfortheirhostportsinthisBD.,ConfigureIPv6LinkLocalAddressforQuerier,ACIusestheBDIPv6linklocaladdresstosendMLDquerieswhenMLDquerierisenabled.TheBDIPv6linklocaladdresscanbeconfiguredunderBBpolicy-L3Configuration.,L3UnknownMcastForwardingOptions,WhenMLDsnoopingisenabled,therearetwooptionsforIPv6L3unknownmcastforwarding:Flood(defaultsetting)unknownIPv6multicasttrafficisfloodedtoallports/EPGswithintheBD.OptimizedFloodunknownIPv6multicasttrafficisforwardedtomulticastrouterports.,MLDSnoopingShowCommands,ShowcommandsforMLDsnooping(PI),showipv6mldsnoopingevent-history|explicit-tracking|extended|groups|internal|lookup-mode|mrouter|querier|statistics|vlanshowipv6mldsnoopingevent-historycoop|mfdm-sum|object-store|statistics|vlan-events|mfdm|mld-snoop-internal|ribshowipv6mldsnoopingexplicit-trackingencap|vlanshowipv6mldsnoopinggroupsdetail|encap|summary|vlanshowipv6mldsnoopinginternalemulated-switch|event-history|ha|mfdm|ribs|slabs-mem|vtep-if-db|encap-db|fabric-groups|memory|proxy-querier|route-txlist|vpc|vxlan-mcast-encap-cfgshowipv6mldsnoopingmrouterdetail|encap|vlanshowipv6mldsnoopingquerierdetail|vlanshowipv6mldsnoopingstatisticsglobal|vlan,ShowMLDsnoopingvlan/querier,swmc1-leaf6#showipv6mldsnoopingvlan9MLDSnoopinginformationforvlan9MLDsnoopingenabledLookupmode:IPOptimisedMulticastFlood(OMF)enabledOMFconfigurationisshownhereMLDquerierpresent,address:fe80:100,version:2Querierinterval:125secsQuerierlastmemberqueryinterval:1secsQuerierrobustness:2Switch-querierenabled,addressfe80:100,currentlyrunningMLDv2ExplicittrackingenabledMLDv1FastleavedisabledMLDv1ReportsuppressionenabledMLDv2ReportsuppressionenabledLinkLocalGroupssuppressionenabledRouterportdetectionusingPIMHellos,MLDQueriesNumberofrouter-ports:0Numberofgroups:0VLANvPCfunctionenabledMulticastRoutingdisabledonVLANActiveports:Eth1/6Snoopingdoneonthisportswmc1-leaf6#showipv6mldsnoopingquerierVlanIPAddressVersionExpiresPort7fe80:200:1ff:fe00:901v100:04:14Tunnel1ExternalSwitchQuerier9fe80:222:bdff:fef8:19ffv200:01:39SwitchquerierBDactingasQuerierwithdefaultLLaddress20fe80:100v200:00:40SwitchquerierBDasQuerierwithfe80:100configuredasLLaddress,ShowMLDsnoopinggroups,swmc1-leaf6#showipv6mldsnoopinggroupsType:S-Static,D-Dynamic,R-RouterportVlanGroupAddressVerTypeEncapPortlist9ff05:4v2aaaa:1D10Eth1/69ff05:5v2aaaa:1D10Eth1/6swmc1-leaf6#,swmc1-leaf6#showipv6mldsnoopinggroupsvlan9detailGroupaddr:ff05:5Groupver:v2old-host-timer:notrunningLastreporter:fe80:200:1ff:fe00:910GroupReportTimer:0.000000Groupv2ExpiryReportTimer:00:00:28Numofsourcesjoined:1Sourceaddr:aaaa:1MLDv2reportsuppressflagissetEncap:10Dynamicmembports:Ethernet1/6expires:00:02:08vPCpeer-linksourceflag:include,ShowcommandsforMLDsnooping(MFDM),showforwardingdistributionmulticastvlan_dbshowforwardingdistributionl2multicastshowforwardingdistributionmulticastoutgoing-interface-listmetshowforwardingdistributionl2multicastvlanshowforwardingdistributionl2multicastgipishowforwardingdistributionl2multicastgipiv6showforwardingdistributionl2multicastgipivlanshowforwardingdistributionl2multicastgipiv6showforwardingdistributionl2multicastgipiv6vlanshowforwardingdistributionl2multicastomfshowforwardingdistributionl2multicastomfv6showforwardingdistributionl2multicastomfvlanshowforwardingdistributionl2multicastomfv6vlan,ShowcommandsforMLDsnooping(L2MCAST),showsysteminternalforwardingl2multicastsnooping-statusshowsysteminternalforwardingl2multicastallshowsysteminternalforwardingl2multicastgipiv6showsysteminternalforwardingl2multicastipmc4showsysteminternalforwardingl2multicastgipiv6showsysteminternalforwardingl2multicastgipivlanshowsysteminternalforwardingl2multicastgipiv6vlanshowsysteminternalforwardingl2multicastomfv6showsysteminternalforwardingl2multicastomfv6vlan2,MLD-snoopgroupinM2RIB/MFDM,swmc1-leaf6#showforwardingdistributionl2multicastgipiv6VLANGroupAddressSourceTypeEncapTypeGIPoMET/IPMC(SW)9ff05:40:GIPI110NAT0.0.0.03(1)9ff05:50:GIPI110NAT0.0.0.03(1),swmc1-leaf6#showl2mroutevlan9(vlan/9,aaaa:1,ff05:4),uptime:07:21:53,mldOutgoinginterfacelist:(count:1)NH:EPG:10GIPO:0.0.0.0,If:Ethernet1/6uptime:07:21:53,mld(vlan/9,aaaa:1,ff05:5),uptime:07:21:53,mldOutgoinginterfacelist:(count:1)NH:EPG:10GIPO:0.0.0.0,If:Ethernet1/6uptime:07:21:53,mld,MLD-snoopgroupinL2Mcast,module-1#showsysteminternalforwardingl2multicastsnooping-statusBD_VLANIGMP_SNUMCMLD_SNIPv6_UMC7EnabledFLOODEnabledFLOOD9EnabledFLOODEnabledOMFmodule-1#showsysteminternalforwardingl2multicastall90:OMF655359ff05:4GIPi110NAT0.0.0.03(1)9ff05:5GIPi110NAT0.0.0.03(1),MLD-snooprouteinSDK-HAL,module-1#showplatforminternalhalobjectsmcastl2mcastroutegroupaddrv6ff05:5/128extensionsOBJECT0:Handle:49579groupaddr:ff05:5/128grpprefixlen:0 x80sourceaddr:0.0.0.0/0l2mcastroutect