MLD snooping overview | Brocade Communications Systems IPMC5000PEF

IPv6 Multicast Traffic Reduction

● IPv6 Multicast Traffic Reduction	43
● MLD snooping overview	43
● MLD snooping configuration	48
● Displaying MLD snooping information	55
● Clearing MLD snooping counters and mcache	61

●Disabling the flooding of unregistered IPv6 multicast frames in an MLD-snooping-

enabled VLAN	62
● PIM6 SM traffic snooping overview	62
● PIM6 SM snooping configuration	65
● PIM6 SM snooping show commands	66

IPv6 Multicast Traffic Reduction

Lists IPv6 Multicast Traffic Reduction features supported on FastIron devices.

The following table lists the individual Brocade FastIron switches and the IPv6 Multicast Traffic Reduction features they support. These features are supported in the Layer 2 and Layer 3 software images.

Feature	ICX 6430	ICX 6450	FCX	ICX 6610	ICX 6650	FSX 800	ICX 7750
						FSX 1600

MLD v1/v2 snooping (global and local)	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

MLD fast leave for v1	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

MLD tracking and fast leave for v2	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

Static MLD groups with support for proxy	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

MLD v1/v2 snooping per VLAN	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

PIM6-SM snooping	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.01	08.0.10

MLD snooping overview

The default method a device uses to process an IPv6 multicast packet is to broadcast it to all ports except the incoming port of a VLAN. Packets are flooded by hardware without going to the CPU, which may result in some clients receiving unwanted traffic.

If a VLAN is not Multicast Listening Discovery (MLD) snooping-enabled, it floods IPv6 multicast data and control packets to the entire VLAN in hardware. When snooping is enabled, MLD packets are trapped to the CPU. Data packets are mirrored to the CPU and flooded to the entire VLAN. The CPU then installs hardware resources so subsequent data packets can be hardware-switched to desired

FastIron Ethernet Switch IP Multicast Configuration Guide	43
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Brocade Communications Systems IPMC5000PEF manual IPv6 Multicast Traffic Reduction, MLD snooping overview

Contents

FastIron Ethernet Switch IP Multicast Page Contents Vlan Enabling Igmp V3 membership tracking and fast leave for Defining the maximum number of PIM cache entries Configuring Msdp Configuring Multicast Source Discovery Protocol MsdpConfiguring Msdp mesh groups Configuring Msdp mesh group 147 PIM Anycast RP 194 Configuring PIM Anycast RP196 Enabling MLDv2 197 209 Clearing IPv6 MLD traffic 206 Command syntax conventions Document conventionsText formatting conventions Convention Brocade resources Getting technical helpBrocade resources Document feedback Document feedback What’s new in this document IntroductionSupported hardware Support is added for static mroute How command information is presented in this guide How command information is presented in this guide Igmp snooping overview Supported IPv4 Multicast Traffic Reduction Queriers and non-queriers Queriers and non-queriers VLAN-specific configuration VLAN-specific configurationTracking and fast leave Forwarding mechanism in hardware Following notes apply to all devices Hardware resources for Igmp and PIM-SM snooping Igmp snooping configuration Igmp snooping configuration Igmp snooping mcache entries and group addresses Igmp snooping mcache entries and group addressesSyntax no system-max igmp-snoop-mcache num Configuring the Igmp mode Setting the maximum number of Igmp group addressesConfiguration notes for Layer 3 devices Setting the maximum number of Igmp group addresses Configuring the global Igmp mode Configuring the Igmp versionConfiguring the Igmp mode for a Vlan Configuring the global Igmp version Configuring the Igmp version for individual ports in a Vlan Configuring static groups to specific portsConfiguring the Igmp version for individual ports in a Vlan Information specific to FCX and ICX devices Disabling Igmp snooping on a Vlan Modifying the query interval active Igmp snooping mode onlyModifying the age interval for group membership entries Modifying the maximum response time Configuring report control Configuring report controlModifying the multicast cache age time Configuring static router ports Enabling or disabling error and warning messagesEnabling or disabling error and warning messages Turning off static group proxy Enabling fast convergence Enabling fast leave for IgmpEnabling fast leave for Igmp Syntax no multicast tracking Displaying the Igmp snooping configuration Igmp snooping show commandsIgmp snooping show commands Syntax multicast fast-convergence Displaying Igmp snooping errors Displaying Igmp snooping errorsSyntax show ip multicast error Displaying Igmp group information Displaying Igmp snooping mcache information Displaying Igmp snooping mcache informationSyntax show ip multicast group group-addressdetail tracking Displaying software resource usage for VLANs Displaying software resource usage for VLANsSyntax show ip multicast mcache Syntax show ip multicast resource Displaying the status of Igmp snooping traffic Displaying the status of Igmp snooping trafficSyntax show ip multicast traffic Displaying querier information Displaying querier information Displaying the active Interface with other querier present Displaying the passive interface with other querier present Displaying the passive interface with other querier present Clear commands for Igmp snooping Clear commands for Igmp snoopingClearing the Igmp mcache Clearing the mcache on a specific Vlan Clearing Igmp counters on VLANs PIM SM traffic snooping overviewApplication examples of PIM SM traffic snooping Clearing Igmp counters on VLANs IPv4 Multicast Traffic Reduction Configuration notes and limitations for PIM SM snooping Configuration notes and limitations for PIM SM snooping PIM SM snooping configuration PIM SM snooping configurationEnabling or disabling PIM SM snooping Enabling PIM SM snooping on a Vlan PIM SM snooping show commandsDisabling PIM SM snooping on a Vlan Displaying PIM SM snooping information Displaying PIM SM snooping information on a Layer 2 switch Displaying PIM SM snooping information on a Layer 2 switchSyntax show ip multicast pimsm-snooping vlan-id Syntax show ip multicast pimsm-snooping vlan vlan-id Multicast Group IP address of the multicast group IPv4 Multicast Traffic Reduction MLD snooping overview IPv6 Multicast Traffic Reduction FastIron Ethernet Switch IP Multicast Configuration Guide Forwarding mechanism in hardware Hardware resources for MLD and PIMv6 SM snooping MLD snooping configuration notes and feature limitations MLD snooping configuration notes and feature limitations MLD snooping-enabled queriers and non-queriers MLD snooping-enabled queriers and non-queriers MLD and Vlan configuration MLD snooping configurationMLD and Vlan configuration MLDv1 with MLDv2 Configuring the hardware and software resource limits Configuring the global MLD modeConfiguring the hardware and software resource limits Configuring the global MLD version Modifying the query interval active MLD snooping mode onlyModifying the age interval Modifying the age interval Syntax no ipv6 multicast report-control Modifying the multicast cache aging timeSyntax no ipv6 multicast leave-wait-time num Syntax no ipv6 multicast mcache-age num Configuring the MLD mode for a Vlan Disabling error and warning messagesConfiguring the MLD version for the Vlan Disabling error and warning messages Configuring static groups Configuring the MLD version for individual portsConfiguring the MLD version for individual ports Disabling static group proxy By default, MLD snooping proxy is enabled Configuring fast leave for MLDv1Syntax no multicast6 proxy-off Syntax no multicast6 tracking Syntax show ipv6 multicast error Displaying MLD snooping error informationDisplaying MLD snooping information Enabling fast convergence Displaying MLD group information Displaying MLD group information Displaying MLD snooping mcache information Displaying MLD snooping mcache informationSyntax show ipv6 multicast mcache System-max mld-snoop-mcache command IPv6 Multicast Traffic ReductionSyntax show ipv6 multicast resource Displaying status of MLD snooping traffic Displaying status of MLD snooping trafficSyntax show ipv6 multicast traffic Displaying MLD snooping information by Vlan Displaying MLD snooping information by VlanSyntax show ipv6 multicast vlan vlan-id Clearing MLD counters on all VLANs Clearing MLD snooping counters and mcacheClearing the mcache on all VLANs Clearing traffic counters on a specific Vlan Application examples of PIM6 SM traffic snooping PIM6 SM traffic snooping overview IPv6 Multicast Traffic Reduction Configuration notes and limitations for PIM6 SM snooping Configuration notes and limitations for PIM6 SM snooping PIM6 SM snooping configuration PIM6 SM snooping configurationEnabling or disabling PIM6 SM snooping Enabling PIM6 SM snooping on a Vlan PIM6 SM snooping show commandsDisabling PIM6 SM snooping on a Vlan Displaying PIM6 SM snooping information Displaying PIM6 SM snooping for a Vlan Displaying PIM6 SM snooping for a VlanSyntax show ipv6 multicast pimsm-snooping vlan vlan-id Displaying PIM6 SM snooping for a Vlan A mixed stack only Supported IPv4 Multicast Protocols features PIM-SSM IPv4 Multicast Protocols Overview of IP multicasting System-max command changesSupport for Multicast Multi-VRF Multicast terms Show and clear command support Show and clear command supportChanging global IP multicast parameters Concurrent support for multicast routing and snooping Defining the maximum number of PIM cache entries Defining the maximum number of Igmp group addressesDefining the maximum number of PIM cache entries Modifying Igmp V1 and V2 query interval period Changing Igmp V1 and V2 parametersModifying Igmp V1 and V2 membership time Modifying Igmp V1 and V2 maximum response time Security enhancement for Igmp Adding an interface to a multicast groupSecurity enhancement for Igmp Syntaxno ip igmp max-response-time num Configuring multicast non-stop routing Configuration considerationsMulticast non-stop routing Multicast non-stop routing PIM v6 is configured PIM v4 is configuredDisplaying the multicast NSR status Displaying the multicast NSR status Passive multicast route insertion Passive multicast route insertion Configuring Pmri Configuring PmriSyntax no hardware-drop-disable IP multicast boundaries Displaying multicast boundaries Configuring multicast boundariesStandard ACL to permit multicast traffic Extended ACL to deny multicast traffic PIM Dense PIM Dense Initiating PIM multicasts on a network Pruning a multicast treeInitiating PIM multicasts on a network Pruning leaf nodes from a multicast tree Grafts to a multicast tree Grafts to a multicast tree PIM DM versions Configuring PIM DMEnabling PIM on the device and an interface Globally enabling and disabling PIM Enabling a PIM version Modifying neighbor timeoutModifying PIM global parameters Modifying PIM global parameters Modifying hello timer Modifying prune timerModifying the prune wait timer Modifying inactivity timer Modifying graft retransmit timerFailover time in a multi-path topology Selection of shortest path back to source Displaying basic PIM Dense configuration information Configuring a DR priorityConfiguring a DR priority Syntax no ip pim dr-priority priority-value Displaying all multicast cache entries Displaying all multicast cache entries in a pruned stateDisplaying all multicast cache entries in a pruned state Syntax show ip pim vrf vrf-name prune IPv4 Multicast Protocols Blocked Filter L2 FID Displaying information across VRFs Displaying information across VRFs PIM Sparse PIM Sparse device typesPIM Sparse Configuring PIM Sparse RP paths and SPT pathsRP paths and SPT paths Current limitations Configuring global PIM Sparse parametersEnabling PIM Sparse for a specified VRF Current limitations Configuring BSRs Configuring PIM interface parametersConfiguring PIM interface parameters Syntax no ip pim-sparse Configuring RPs Configuring RPsSyntax no rp-candidate add group-addrmask-bits Syntax no rp-candidate delete group-addrmask-bits Statically specifying the RPSyntax clear ip pim vrf vrf-name rp-map Syntax no rp-address ip-addr Configuring an ACL based RP assignment Configuration considerationsACL based RP assignment Displaying the static RP Multicast Outgoing Interface OIF list optimization PIM PassivePIM Passive Syntax no ip pim passive Displaying system values Displaying PIM resourcesDisplaying system values Syntax show ip pim all-vrf vrf vrf-name hw-resource Syntax show ip pim all-vrf vrf vrf-name resource Displaying basic PIM Sparse configuration information Output from the show ip pim all-vrf hw-resource commandSyntax show ip pim vrf vrf-name sparse This field Displays Global PIM Sparse mode settings Output of the show ip pim sparse command Output of the show ip pim sparse command Displaying a list of multicast groupsDisplaying a list of multicast groups Displaying BSR information Output from the show ip pim group commandDisplaying BSR information Syntax show ip pim vrf vrf-name group Syntax show ip pim vrf vrf-name bsr Output from the show ip pim bsr command Displaying candidate RP information Output from the show ip pim bsr commandDisplaying candidate RP information This system is not a Candidate-RP Displaying RP-to-group mappings Output from the show ip pim rp-candidate commandDisplaying RP-to-group mappings Syntax show ip pim vrf vrf-name rp-map Displaying RP Information for a PIM Sparse group Output of the show ip pim rp-map commandDisplaying the RP set list Displaying RP Information for a PIM Sparse group Displaying multicast neighbor information Displaying multicast neighbor informationSyntax show ip pim vrf vrf-name rp-set Syntax show ip pim vrf vrf-name neighbor Displaying the PIM multicast cache Displaying the PIM multicast cache IPv4 Multicast Protocols Ingress Vlan Displaying the PIM multicast cache for DIT Displaying the PIM multicast cache for DIT Displaying PIM traffic statistics Clearing the PIM forwarding cacheClearing the PIM forwarding cache Syntax show ip pim vrf vrf-name mcache dit-idx dit Syntax show ip pim vrf vrf-name traffic join-prune rx tx Clearing the PIM message counters Clearing the PIM message countersSyntax clear ip pim vrf vrf-name traffic Displaying PIM RPF Configuring Multicast Source Discovery Protocol MsdpDisplaying PIM RPF Syntax show ip pim vrf vrf-name rpf ip-address Peer Reverse Path Forwarding RPF flooding Source Active cachingPeer Reverse Path Forwarding RPF flooding Configuring Msdp peers Configuring MsdpConfiguring Msdp Enabling Msdp Designating the interface IP address as the RP IP address Disabling an Msdp peerDisabling an Msdp peer Syntax no msdp-peer ip-addrshutdown Filtering incoming and outgoing Source-Active messages Filtering Msdp source-group pairsExample Filtering Msdp source-group pairs IPv4 Multicast Protocols Displaying Msdp information Filtering advertised Source-Active messagesDisplaying summary information Filtering advertised Source-Active messages Syntax show ip msdp summary Displaying peer information Msdp peer information Syntax show ip msdp vrf vrf-name peer TCP Statistics IPv4 Multicast Protocols Displaying Source Active cache information Displaying Msdp RPF-Peer Displaying Msdp RPF-PeerSyntax show ip msdp vrf vrf-name rpf-peer ip-addr Displaying Msdp VRF RPF-Peer Displaying Msdp PeerClearing Msdp information Clearing peer information Clearing the source active cache Configuring Msdp mesh groupsClearing the source active cache for a VRF Clearing Msdp statistics Configuring Msdp mesh group Configuring Msdp mesh group Msdp Anycast RP Configuring Msdp Anycast RPMsdp Anycast RP Syntax no mesh-group group-namepeer-address Example Example RP 1 configuration PIMR1 configuration RP 2 configuration PIMR2 configuration Configuring PIM Anycast RPPIM Anycast RP PIM Anycast RP Displaying information for a PIM Anycast RP interface Displaying information for a PIM Anycast RP interfaceSyntax show ip pim vrf vrf-name anycast-rp Static multicast routes Static multicast routes Configuring Igmp Proxy Igmp proxy configuration notesIgmp Proxy Igmp proxy limitations Filtering groups in proxy report messages Displaying Igmp Proxy informationFiltering groups in proxy report messages Use the show ip igmp proxy summary Output of show ip igmp proxyOutput of show ip igmp proxy summary Syntax show ip igmp proxy stats Igmp Default Igmp version Default Igmp versionCompatibility with Igmp V1 Globally enabling the Igmp version Enabling the Igmp version per interface settingGlobally enabling the Igmp version Syntax no ip igmp version version-number Enabling membership tracking and fast leave Enabling membership tracking and fast leaveSyntax no ip igmp tracking Or this command Setting the query intervalCreating a static Igmp group Creating a static Igmp group Setting the maximum response time Setting the group membership timeSetting the group membership time Displaying IGMPv3 information Age 253 226.0.0.1 Displaying static Igmp groups Clearing the Igmp group membership tableDisplaying the Igmp status of an interface Clearing the Igmp group membership table IPv4 Multicast Protocols Displaying Igmp traffic status Clearing Igmp traffic statisticsClearing Igmp traffic statistics Syntax show ip igmp vrf vrf-name traffic Displaying Igmp settings Syntax show ip igmp vrf vrf-name settingsSyntax clear ip igmp vrf vrf-nametraffic Source-specific multicast Configuring PIM SSM group rangeIgmp V3 and source specific multicast protocols Source-specific multicast Configuring multiple SSM group ranges Syntax no ssm-enable range group-addressaddress-maskSyntax no ssm-enable range acl-idor acl-name IGMPv2 SSM mapping Displaying information for PIM SSM range ACLDisplaying information for PIM SSM range ACL Configuring the IGMPv2 SSM mapping commands Configuring an ACL for IGMPv2 SSM mappingConfiguring an ACL for IGMPv2 SSM mapping Enabling IGMPv2 SSM mapping Displaying an Igmp SSM mapping information Example configurationDisplaying an Igmp SSM mapping information Syntax show ip igmp vrf vrf-name ssm-map A mixed stack only 3rd generation modules only Supported IPv6 Multicast Features IPv6 PIM Sparse PIM Sparse router typesIPv6 PIM Sparse RP paths and SPT paths Configuring IPv6 PIM-SM on a virtual routing interface IPv6 PIM-Sparse modeIPv6 PIM-Sparse mode Enabling IPv6 PIM-SM for a specified VRF Setting the BSR message interval Configuring BSRsConfiguring BSRs Syntax no bsr-msg-interval num Configuring candidate RP Configuring candidate RPSyntax no rp-candidate add group-ipv6addressmask-bits Syntax no rp-candidate delete group-ipv6addressmask-bits Syntax no rp-address ipv6-addr Embedded Rendezvous PointIpv6-addrparameter specifies the IPv6 address of the RP Syntax clear ipv6 pim vrf vrfname rp-map Changing the Shortest Path Tree threshold Setting the RP advertisement intervalChanging the Shortest Path Tree threshold Syntax no rp-embedded Changing the PIM Join and Prune message interval Changing the PIM Join and Prune message intervalSyntax rp-adv-interval seconds Syntax no message-interval seconds Setting the register suppress interval Setting the prune wait intervalSetting the register probe time Setting the prune wait interval Changing the hello timer Setting the inactivity timerSetting the inactivity timer Syntax no hello-timer seconds Syntax no ssm-enable range address-range Configuring Source-specific MulticastEnabling Source-specific Multicast Enabling Source-specific Multicast Configuring Pmri Passive Multicast Route InsertionDisplaying hardware-drop Displaying system values Displaying basic PIM Sparse configuration information Syntax show ipv6 pim vrf vrf-name sparse IPv6 Multicast Protocols Displaying IPv6 PIM interface information Displaying IPv6 PIM interface information Syntax show ipv6 pim vrf vrf-name group Displaying a list of multicast groups Output from the show ipv6 pim group command Displaying BSR informationSyntax show ipv6 pim vrf vrf-name bsr Displaying candidate RP information Syntax show ipv6 pim vrf vrf-name rp-candidate Displaying RP-to-group mappings Displaying the RP set list Displaying RP information for an IPv6 PIM Sparse groupDisplaying RP information for an IPv6 PIM Sparse group Syntax show ipv6 pim vrf vrf-name rp-map Displaying multicast neighbor information Syntax show ipv6 pim vrf vrf-name rp-setSyntax show ipv6 pim vrf vrf-name neighbor Displaying the IPv6 PIM multicast cache Displaying the IPv6 PIM multicast cache For Replication Entry Displaying IPv6 PIM counters Displaying IPv6 PIM RPFDisplaying IPv6 PIM RPF Syntax show ipv6 pim vrf vrf-name rpf ip-address Displaying the IPv6 PIM resources Displaying the IPv6 PIM resourcesSyntax show ipv6 pim vrf vrf-name counter Syntax show ipv6 pim all-vrf vrf vrf-name resource Displaying PIM traffic statistics Displaying PIM traffic statisticsSyntax show ipv6 pim all-vrf vrf vrf-name hw-resource Syntax show ipv6 pim vrf vrf-name traffic Clearing the IPv6 PIM message counters Clearing the IPv6 PIM forwarding cacheClearing the IPv6 PIM forwarding cache Syntax clear ipv6 pim vrf vrf-name cache Clearing the IPv6 PIM traffic Defining the maximum number of IPv6 PIM cache entriesClearing the IPv6 PIM traffic Configuring a static multicast route within a VRF Configuring a static multicast route within a VRF Route Precedence Admin-distance Syntax no anycast-rprp-address my-anycast-rp-set-acl Displaying information for an IPv6 PIM Anycast RP interface Displaying information for an IPv6 PIM Anycast RP interfaceSyntax show ipv6 pim vrf vrf-name anycast-rp Setting the group membership time Configuring MLD parameters for default and non-default VRFsEnabling MLDv2 Enabling MLDv2 Setting the maximum response time Defining the maximum number of MLD group addressesDefining the maximum number of MLD group addresses Setting the last listener query interval Setting the query intervalSetting the robustness Setting the query interval Setting the version Configuring MLD parameters at the interface levelSetting the version Specifying a port version Displaying MLD information Setting the version on an interfaceEnabling MLD tracking on an interface Enabling MLD tracking on an interface Displaying MLD group information Displaying MLD definitions for an interfaceSyntax show ipv6 mld vrf vrf-name group Displaying MLD settings Displaying MLD settings Following command displays static MLD groups for the cs VRF Syntax show ipv6 mld vrf vrf-name settingsDisplaying static MLD groups Displaying static MLD groups Displaying MLD traffic Output from the show ipv6 mld vrf cs static commandDisplaying MLD traffic Report has a Receive and a Send section Clearing IPv6 MLD traffic IPv6 Multicast BoundariesClearing the IPv6 MLD group membership table cache Clearing IPv6 MLD traffic ACL to permit multicast traffic Configuration considerationsACL to deny multicast traffic Syntax no ipv6 multicast-boundary acl-spec Displaying multicast boundaries Removes multicast routes from the mRTM Clear ip mroute Clear ipv6 mroute Privileged Exec modeClear ipv6 mroute Removes IPv6 multicast routes from the mRTM Ip mroute Ip max-mrouteIp max-mroute Ip max-mroute num No ip max-mroute Ip mroute next hop Configures a static multicast route with a next hopIp mroute next hop Tunnel num Ip mroute next-hop-enable-default Ip mroute next-hop-enable-defaultIp mroute vrf vrf-name next-hop-enable-default No ip mroute vrf vrf-name next-hop-enable-default Ip mroute next-hop-recursion Ip multicast disable-floodingIp mroute next-hop-recursion Ip mroute vrf vrf-name next-hop-recursion Ipv6 mroute Ipv6 max-mrouteIpv6 max-mroute Ipv6 max-mroute num Configures a static mroute with a next hop Modes VRF configuration modeCommand Default No next-hop static mroute is configured Ipv6 mroute next hop Ipv6 mroute next-hop-enable-default Ipv6 mroute next-hop-enable-defaultIpv6 mroute vrf vrf-name next-hop-enable-default No ipv6 mroute vrf vrf-name next-hop-enable-default Ipv6 mroute next-hop-recursion Ipv6 multicast disable-floodingIpv6 mroute next-hop-recursion Ipv6 mroute vrf vrf-name next-hop-recursion Route-precedence Route-precedence Route-precedence admin-distance Route-precedence admin-distanceShow ip mroute Static IP Multicast CommandsConnected This example displays information for IP multicast route Show ip multicast optimization Displays information for configured multicast routesShow ip static mroute Show ip multicast optimization ipmc Ipmc Show ipv6 mroute Show ipv6 mrouteConnect Summary Show ipv6 multicast optimization Modes Privileged Exec modeThis example displays information for IPv6 multicast route Syntax show ipv6 multicast optimization l2mc Displays information for configured IPv6 multicast routes Show ipv6 static mrouteShow ipv6 static mroute Show ipv6 static mroute Command output CommandFeature support Igmp snooping Show command Show commands show commandMulticast fast-convergencecommand Multicast fast-leave-v2command