TRENDware TEG-S2500i, Руководство пользователя

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2.5.6 Filter Database
2.5.6.1. IGMP Snooping
The 24+2G switch supports multicast IP. One can enable IGMP protocol on this web page, and then
display the IGMP snooping information on this page. There are all multicast groups, VIDs and member
ports in the list. 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.
IGMP can manage the multicast traffic if the members (switches, router or other network devices) of
group support IGMP. With IGMP enable, the member ports will detect IGMP queries, report packets and
manage the IP multicast traffic through the switch.
IGMP have three fundamental types of message as follows:
Message Description
Query A message sent from the queries (IGMP router or switch) asking for a
response from each host belonging multicast group.
Report A message sent by a host to the queries 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 queries to indicate that the host has quit being
a member of a specific multicast group.