Milan Technology MIL-SM8002TG - Manual (Page 106)

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SNTP Configuration interface
IGMP Configuration
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 have three fundamental types of
message as follows:
Message Description
Query
A message sent from the querier (IGMP router or switch) asking
for a response from each host belonging to the multicast group.