Netgear M4300-24X24F (XSM4348S) - Stackable Managed Switch with 48x10G including 24x10GBASE-T and 24xSFP+ Layer 3 Guia Do Administrador

Multicast Listener Discovery (MLD) protocol enables IPv6 routers to discover multicast 
listeners, the nodes that are configured to receive multicast data packets, on its directly 
attached interfaces. The protocol specifically discovers which multicast addresses are of 
interest to its neighboring nodes and provides this information to the active multicast routing 
protocol that determines the flow of multicast data packets. 

Periodically, the multicast router sends general queries requesting multicast address listener 
information from systems on an attached network. These queries are used to build and 
refresh the multicast address listener state on the attached networks. In response to the 
queries, multicast listeners reply with membership reports. These membership reports 
specify their multicast addresses listener state and their desired set of sources with 
current-state multicast address records. 

The multicast router also processes unsolicited filter- mode-change records and 
source-list-change records from systems that want to indicate interest in receiving or not 
receiving traffic from particular sources.

In this case, PIM-DM is enabled on Switch A and Switch B, and MLD is enabled on Switch 
B’s port 1/0/24 to discover the multicast listeners.

2001:2::/65

Port 1/0/13

Port 1/0/1

2001:1::/64

Port 1/0/21

Port 1/0/24

2001:3::/64