Milan Technology MIL-SM808G Manuel D’Utilisation

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The switch supports IP multicasting.  You can enable IGMP via the web
management’s configuration screen. In addition, you can view different
multicast groups, VIDs and member ports, and IP multicast addresses that
range from 224.0.0.0 through 239.255.255.255.

The Internet Group Management Protocol (IGMP) is an internal protocol of
the Internet Protocol (IP) suite.  IP manages multicast traffic by using
switches, routers, and hosts that support IGMP. Enabling IGMP allows the
ports to detect IGMP queries and report packets and manage IP multicast
traffic through the switch. IGMP has three fundamental types of messages.

A message sent from the querier (IGMP router or switch) asking for a
response from each host belonging to the multicast group.

A message sent by a host to the querier to indicate that the host wants to be
or is a member of a given group indicated in the report message.

A message sent by a host to the querier to indicate that the host has quit to
be a member of a specific multicast group.