Operation Manual – Multicast ProtocolH3C S3610&S5510 Series Ethernet Switches Chapter 3 MLD Snooping Configuration3-133.5 Configuring MLD Snooping Querier3.5.1 Configuration PrerequisitesBefore configuring MLD Snooping querier, complete the following task:z Enable MLD Snooping in the VLAN.Before configuring MLD Snooping querier, prepare the following data:z MLD general query interval,z MLD last-member query interval,z Maximum response time for MLD general queries,z Source IPv6 address of MLD general queries, andz Source IPv6 address of MLD multicast-address-specific queries.3.5.2 Enabling MLD Snooping QuerierIn an IPv6 multicast network running MLD, a multicast router or Layer 3 multicast switchis responsible for sending periodic MLD general queries, so that all Layer 3 multicastdevices can establish and maintain multicast forwarding entries, thus to forwardmulticast traffic correctly at the network layer. This router or Layer 3 switch is calledMLD querier.However, a Layer 2 multicast switch does not support MLD, and therefore cannot sendMLD general queries by default. By enabling MLD Snooping querier on a Layer 2switch in a VLAN where multicast traffic needs to be Layer-2 switched only and noLayer 3 multicast devices are present, the Layer 2 switch will act as the MLD querier tosend periodic MLD queries, thus allowing multicast forwarding entries to be establishedand maintained at the data link layer.Follow these steps to enable the MLD Snooping querier:To do... Use the command... RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —Enable the MLD Snoopingquerier mld-snooping querier RequiredDisabled by default
