NetComm NP2624M - Manual (Page 26)

26 NP2624M User Guide
YML827 Rev1
2.5.6 Filter Database
2.5.6.1. IGMP Snooping
The NP2624M switch supports multicast IP. IGMP protocol can be enabled on this web page,
and IGMP snooping information is displayed on this page. All multicast groups, VIDs and
member ports are displayed 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 groups support IGMP. With IGMP enabled, 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 is sent from the queries (IGMP router
or switch) asking for a response from each host
belonging multicast group.
Report A message is 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 is sent by a host to the queries to indicate
that the host has quit being a member of a specific
multicast group.