For the device to learn multicast-router interfaces and group-member interfaces, an MLD querier must exist in the network. For the device itself to function as an MLD querier, MLD must be enabled on the device. You can statically configure an interface to be a multicast-router interface or a group-member interface.

What is MLD querier?

The querier is a multicast router or a switch that periodically asks MLD hosts on the network to verify their multicast join requests. There is one querier for each VLAN, and all switches on the VLAN listen to the responses of MLD hosts to multicast queries and forward or block multicast traffic accordingly.

Should I use IGMP snooping?

IGMP snooping is an important feature of network switches. When it is enabled, the bandwidth consumption will be reduced in a multi-access LAN environment so as to avoid flooding the entire VLAN, and network information security can also be improved at the same time.