LevelOne GSW-2493, Руководство пользователя

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Forwarding and Filtering
IGMP Snooping
The switch support IP multicast, you can enable IGMP protocol on web management’s
switch setting advanced page, then display the IGMP snooping information in this page,
you can view difference multicast group VID and member port in here, IP multicast
addresses 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 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.
Report
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.
Leave
Group
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.
When you enable the IGMP Snooping, you will see the relate information show as
following figure.