Ruijie RG-S2900G-E Series, Configuration Manual

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Configuration Guide MLD Snooping Configuration
Figure 1 Two types of MLD Snooping ports
Multicast Router Port: a multicast device of the switch to connect layer 3, e.g., Eth 0 /
1 port;
Member Port: the short form of the IPv6 multicast group member port, also called
Listener Port. For example, the Access Switch Eth0/2
、
Eth0/3 and Eth0/4 port.
MLD Profiles
MLD Profiles are actually some group filters, which can define a series of multicast
address ranges, and permit or deny the access of those multicast addresses,
providing usage for different functions of the following "multicast address ranges for
SVGL mode application", "multicast data area to be filtered by router port", "MLD
Filtering range", etc.
Working Modes
DISABLE mode: Under this mode, MLD Snooping is out of function, i.e., layer 2
multicast equipment does not "snoop" the MLD message between hosts and router,
and multicast frames are broadcast in VLAN.
IVGL (Independent VLAN Group Learn) working mode: Under this mode, multicast
stream among all VLANs is inter-independent. A host can only request multicast
stream from the router port in the same VLAN where the host is located; switch can
only transmit the multicast data flow being received from any VLAN to listener ports
in the same VLAN.
Working Principle
The switch that runs MLD Snooping processes different MLD messages in the
following ways:
1. MLD QUERY
Layer 3 multicast equipments regularly send group-general query message to all
hosts and routers (address: FF 02::1) within local network segment to find out which
listeners of IPv 6 multicast group exist in this local network segment. A switch
transmits MLD group-general query message being received to all other ports except
receive port within VLAN and process the receive port in the following ways:

If the port is already included in the list of router ports, its aging timer should
be reset.

If the port is not included in the list of router ports, it should be added to the
list of router ports and its aging timer should be enabled.

Whenever receiving MLD group-general query message, layer 2 multicast
equipment will update respective aging timers of all listener ports and