4.11.2 MLD Snooping
Multicast Listener Discovery (MLD) snooping, similar to IGMP snooping for IPv4, operates on IPv6 for multicast traffic. In
other words, MLD snooping configures ports to limit or control IPv6 multicast traffic so that multicast traffic is forwarded
to ports (or users) who want to receive it. In this way, MLD snooping can reduce the flooding of IPV6 multicast packets in
the specified VLANs. Please note that IGMP Snooping and MLD Snooping are independent of each other. They can both
be enabled and function at the same time.
4.11.2.1 Basic Configuration
Global Configuration
Snooping Enabled: Select the checkbox to globally enable MLD Snooping feature. When enabled, this device will monitor
network traffic and determine which hosts would like to receive multicast traffic. The switch can passively monitor or
snoop on MLD Listener Query and Report packets transferred between IP multicast routers and IP multicast service
subscribers to identify the multicast group members. The switch simply monitors the IGMP packets passing through it,
picks out the group registration information and configures the multicast filters accordingly.
Unregistered IPMCv6 Flooding Enabled: Set forwarding mode for unregistered (not-joined) IP multicast traffic. Select the
checkbox to flood traffic.
MLD SSM Range: SSM (Source-Specific Multicast) Range allows the SSM-aware hosts and routers run the SSM service
model for the groups in the address range.
Leave Proxy Enabled: To prevent multicast router from becoming overloaded with leave messages, MLD snooping
suppresses leave messages unless received from the last member port in the group. When the switch acts as the querier,
the leave proxy feature will not function.
Proxy Enabled: When MLD proxy is enabled, the switch exchanges MLD messages with the router on its upstream
interface, and performs the host portion of the MLD task on the upstream interface as follows:
When queried, it sends multicast listener reports to the group.
When a host joins a multicast group to which no other host belongs, it sends unsolicited multicast listener
reports to that group.
When the last host in a particular multicast group leaves, it sends an unsolicited multicast listener done report to
the all-routers address (FF02::2) for MLDv1.
Port Related Configuration
Port: List each port number. “All” rules apply to all ports.
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