Cisco NXOSIOS Multicast Comparison.docx

Cisco NXOSIOS Multicast Comparison.docx

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CiscoNXOSIOSMulticastComparison

Objective

ThistechnoteoutlinesthemaindifferencesinmulticastprotocolsupportbetweenCisco®NX-OSSoftwareandCiscoIOS®Software.SampleconfigurationsareincludedforCiscoNX-OSandCiscoIOSSoftwaretodemonstratethesimilaritiesanddifferences.PleaserefertotheNX-OSdocumentationonConCforacompletelistofsupportedfeatures.

MulticastOverview

Multicasttransmission（one-to-many）providesthecapabilityforasourcehosttoforwardIPpacketstoaninterestedgroupofdestinationhosts,asopposedtousingunicasttransmission（one-to-one）orbroadcasttransmission（one-to-everyoneinthebroadcastdomain）.Multicastfunctionallyistypicallyenabledusingmultipleprotocols.ThistechnoteincludesthefollowingCiscoNX-OSprotocols:

ProtocolIndependentMulticast（PIM）,InternetGroupMembershipProtocol（IGMP）andMulticastSourceDiscoveryProtocol（MSDP）.

ImportantCiscoNX-OSandCiscoIOSSoftwareDifferences

InCiscoNX-OS:

PIMandMSDPprotocolsrequireaLANEnterpriseServiceslicense.

Theglobalipmulicast-routingcommanddoesnotexistandisnotrequiredtoenablemulticastforwarding/routing.（ItisrequiredinCiscoIOSSoftwaretoenablemulticastforwarding/routing）

PIMcommand-lineinterface（CLI）configurationandverificationcommandsarenotavailableuntilyouenablethePIMfeaturewiththefeaturepimcommand.

MSDPCLIconfigurationandverificationcommandsarenotavailableuntilyouenabletheMSDPfeaturewiththefeaturemsdpcommand.

IGMPversions2and3aresupported.IGMPversion1andVersion3Litearenotsupported.

AnIGMPSnoopingQuerierisconfiguredunderthelayer-2VLANwiththeipigmpsnoopingquerierCLIcommand（PhysicalL3interfacescannotbeconfiguredasIGMPSnoopingQueriers）.InCiscoIOSSoftware,itisconfiguredunderthelayer-3interface.

PIMversion2SparseModeissupported.CiscoNX-OSdoesnotsupportPIMversion1SparseModeorDenseMode.

PIMStaticRendezvousPoint（RP）automaticallyoverridesdynamicallylearnedRP's,whereastheCiscoIOSSoftwarerequirestheoverridestaticRPCLIoption.

WhenconfiguringaPIMAuto-RP,CiscoNX-OSusesadefaultscopeof32,whereasCiscoIOSSoftwarerequiresittobespecifiedwiththescopeoption（1-255）.

WhenconfiguringPIMAuto-RPorBSRRP,CiscoNX-OSmulticastdevicesmustbeenabledtolistenand/orforwardRPadvertisementswiththeippimauto-rpforward|listenortheippimbsrforward|listeninterfaceCLIcommands.CiscoIOSSoftwaredoesnothavetheabilitytoenable/disableRPforwardingandlisteningcapabilities.

ThePIMdomainborderippimbsr-borderinterfaceCLIcommandpreventsBSR,Candidate-RPandAuto-RPpacketsfrombeingsentorreceivedonaninterface.TheCiscoIOSSoftwarecommandequivalentonlypreventsBSRpackets.AdditionalconfigurationisrequiredtopreventCandidate-RPandAuto-RPpackets.

PIMneighborauthentication（IPSecah-md5）canbeenabledtoauthenticatedirectlyconnectedneighborstoincreasesecurity.CiscoIOSSoftwaredoesnotsupportthisfunctionality.

PIMneighborloggingcanbeenabledwiththeglobalippimlog-neighbor-changesCLIcommand.（CiscoIOSSoftwareenablesPIMneighborloggingbydefault）

ThedataintheMSDPSource-Active（SA）messagesarecachedbydefault,whereasCiscoIOSSoftwarerequiresthecache-sa-stateandcache-rejected-saCLIcommands.

PIMSparseModeisnotsupportonIPTunnelinterfaces.

PIMisconfiguredwiththeSourceSpecificMulticsat（SSM）grouprange232.0.0.0/8bydefault（ippimssmrange232.0.0.0/8）.

ThingsYouShouldKnow

ThefollowinglistprovidessomeadditionalfactsaboutCiscoNX-OSthatshouldbehelpfulwhendesigning,configuring,andmaintainingmulticastenablednetworks.

Ifyouremovethefeaturepimcommand,allrelevantPIMconfigurationinformationisalsoremoved.

Ifyouremovethefeaturemsdpcommand,allrelevantMSDPconfigurationinformationisalsoremoved.

IGMPSnoopingisenabledgloballybydefault.Itcanbedisabledglobally,orperlayer-2VLANwiththenoigmpsnoopingcommand.

IGMPversion2isenabledbydefaultwhenPIMSparseModeisconfiguredonaninterface.

PIMsupportsthreemodesofoperation:

AnySourceMulticast（ASM）,SingleSourceMulticast（SSM）,BidirectionalSharedTree（Bidr）.ThedefaultmodeisASM.BidrcanbeconfiguredwiththebidroptionwhenconfiguringaRP.

TheCiscoNX-OSsupportsfourtypesofPIMRendezvousPoints:

Static,Bootstraprouter（BSR）,Auto-RPandAnycast-RP.（DonotconfigureBSRandAuto-RPinthesamenetwork）

TheCiscoNX-OShastwodifferentCLIsyntaxoptionswhenconfiguringBSRandAutoRP's（NewCiscoNX-OSsyntax,andbackwardscompatibleCiscoIOSSoftwaresyntax）.

TheCiscoNX-OSsupportsmulticastroutingperlayer-3VirtualRoutingandForwarding（VRF）instance.

PIMSSMandBidrarenotsupportedonVirtualPort-Channels（vPCs）.

ConfigurationComparison

ThefollowingsamplecodeshowsconfigurationsimilaritiesanddifferencesbetweentheCiscoNX-OSandCiscoIOSSoftwareCLIs.Therearefewsignificantdifferences:

CiscoNX-OSdoesnotrequiretheglobalipmulicast-routingcommand,butdoesrequirePIMandMSDPtobeenabledindividuallywiththeglobalfeatureCLIcommands.TheCiscoNX-OShasbackwardscompatiblesyntaxwithCiscoIOSSoftwarewhenconfiguringPIMBSRandAuto-RP,butCiscoNX-OSrequiresRPforwardingand/orlisteningtobeconfiguredpriortolearningorforwardingdynamicRPinformation.BothCiscoNX-OSandCiscoIOSSoftwaresupportmulticastroutingwithinaVRFinstance,butCiscoNX-OSrequiresglobalcommandstobeconfiguredundertheVRFcontextasopposedtousingthevrfoptionaswithCiscoIOSSoftware.

CiscoIOSCLI

CiscoNX-OSCLI

EnablingMulticastForwarding

ipmulticast-routing

TheCiscoNX-OSdoesnothaveasingleglobalcommandtoenablemulticastforwarding/routing.

EnablingthePIMFeature

CiscoIOSSoftwaredoesnothavetheabilitytoenableordisablePIM.

featurepim

ConfiguringaPIMStaticRP

ippimrp-address172.16.1.1

ippimrp-address172.16.1.1

ConfiguringaPIMBSRRP

interfaceLoopback10

ipaddress172.16.1.1255.255.255.255

ippimsparse-mode

ippimbsr-candidateLoopback10

ippimrp-candidateLoopback10group-list10

access-list10permit224.0.0.03.255.255.255

interfaceloopback10

ipaddress172.16.1.1/32

ippimsparse-mode

ippimbsrbsr-candidateloopback10

ippimbsrrp-candidateloopback10group-list224.0.0.0/4

ippimbsrforwardlisten

or

ippimbsr-candidateloopback10

ippimrp-candidateloopback10group-list224.0.0.0/4

ippimbsrforwardlisten

ConfiguringaPIMAuto-RP

interfaceLoopback10

ipaddress172.16.1.1255.255.255.255

ippimsparse-mode

ippimsend-rp-announceLoopback10scope32group-list10

ippimsend-rp-discoveryLoopback10scope32

access-list10permit224.0.0.03.255.255.255

interfaceloopback10

ipaddress172.16.1.1/32

ippimsparse-mode

ippimauto-rprp-candidateloopback10group-list224.0.0.0/4ippimauto-rpmapping-agentloopback10

ippimauto-rpforwardlisten

or

ippimsend-rp-announceloopback10group-list224.0.0.0/4

ippimsend-rp-discoveryloopback10

ippimauto-rpforwardlisten

ConfiguringaPIMAnycast-RP

CiscoIOSSoftwaredoesnothavetheabilitytoenablethePIMAnycastRPfeature.

interfaceloopback10

ipaddress172.16.1.1/32

ippimanycast-rp172.16.1.1192.168.10.2

ConfiguringPIMSparseModeonanInterface

interfaceTenGigabitEthernet1/1

ipaddress192.168.10.1255.255.255.0

ippimsparse-mode

interfaceEthernet1/1

ipaddress192.168.10.1/24

ippimsparse-mode

ConfiguringPIMNeighborAuthentication

CiscoIOSSoftwaredoesnothavetheabilitytoenableneighborauthentication.

interfaceEthernet1/1

ipaddress192.168.10.1/24

ippimsparse-mode

ippimhello-authenticationah-md53a667d47acc18ea6b

ConfiguringaPIMBSRBorderonanInterface

interfaceTenGigabitEthernet1/1

ipaddress192.168.10.1255.255.255.0

ippimbsr-border

ippimsparse-mode

ipmulticastboundary10

access-list10deny224.0.1.39

access-list10deny224.0.1.40

access-list10permit224.0.0.015.255.255.255

interfaceEthernet1/1

ipaddress192.168.10.1/24

ippimsparse-mode

ippimborder

ConfiguringPIMinaNon-DefaultVRFInstance

ipvrfproduction

ipmulticast-routingvrfproduction

interfaceLoopback10

ipvrfforwardingproduction

ipaddress172.16.1.1255.255.255.255

ippimsparse-mode

interfaceTenGigabitEthernet1/1

ipvrfforwardingproduction

ipaddress192.168.10.1255.255.255.0

ippimsparse-mode

ippimvrfproductionrp-address172.16.1.1

vrfcontextproduction

ippimrp-address172.16.1.1group-list224.0.0.0/4

interfaceloopback10

vrfmemberproduction

ipaddress172.16.1.1/32

interfaceEthernet1/1

vrfmemberproduction

ipaddress192.168.10.1/24

ippimsparse-mode

ConfiguringIGMPVersion3foranInterface

interfaceTenGigabitEthernet1/1

ipaddress192.168.10.1255.255.255.0

ippimsparse-mode

ipigmpversion3

interfaceEthernet1/1

ipaddress192.168.10.1/24

ippimsparse-mode

ipigmpversion3

ConfiguringanIGMPSnoopingQuerierforaVLAN

interfaceVlan10

ipaddress192.168.10.1255.255.255.0

ipigmpsnoopingquerier

vlan10

ipigmpsnoopingquerier192.168.10.1

ConfiguringMSDP（Anycast-RP）

interfaceLoopback0

descriptionMSDPPeerAddress

ipaddress192.168.1.1255.255.255.255

interfaceLoopback10

descriptionPIMRPAddress

ipaddress1.1.1.1255.255.255.255

ippimrp-addr