608 | Multicast Listener Discoveryw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Figure 27-3. MLDv2 Multicast Listener ReportImplementation Information• In FTOS versions prior to 8.3.1.0: when a switch on which MLD snooping is enabled acts as Querier,queries sent to a specific port (in the event of a port enable, MLD leave, or MLD join), were sent withan all-zero (::) IPv6 source address. This might unintentionally indicate to another MLD switch that itis elected the Querier. Beginning with FTOS version 8.3.1.0, all queries are flooded on the VLAN sothat the IPv6 source address is correctly included in all queries.• MLDv2 Snooping ignores sources specified in exclude reports; all exclude (S,G) reports are treated asexclude (*,G).• The following querier commands are available for Layer 3 MLD and MLD Snooping: ipv6 mldlast-member-query-interval, ipv6 mld query-interval, ipv6 mld query-max-resp-time.Enabling MLDMLD is enabled automatically when IPv6 PIM is enabled.Related MLD Configuration Tasks• Change MLD Timer Values on page 609• Reduce Host Response Burstiness on page 609• Reduce Leave Latency on page 609• Configure a Static Group on page 610• Clear MLD Groups on page 611• Change the MLD Version on page 611Version(6)Traffic Class Flow Label Payload Length Next Header(0)Hop Limit(1) ICMPv6 PacketPreamble Start FrameDelimiterDestination MAC Source MAC Ethernet Type IPv6 Packet PaddingMLD 003Type Code(0)Multicast Address RecordChecksumCode: 130: Multicast Listener Query131: Multicast Listener Report132: Multicast Listener Done143: Version 2 Multicast Listener ReportFCSNext Header(58)Header ExtensionLength(0)Options(Router Alert)Reserved NRecord Type Aux Data Length(0)N Multicast Address Source AddressesCode: 1: MODE_IS_INCLUDE2: MODE_IS EXCLUDE3: CHANGE_TO_INCLUDE4: CHANGE_TO_EXCLUDE5: ALLOW_NEW_SOURCES6: BLOCK_OLD_SOURCES
