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A host sends an IGMP
“report”
to
host will never send a report when it wants to leave a group (for version 1).
ants to leave a group (for version 2).
p address: 224.0.0.1) periodically to see
ponse from a particular group,
p members on the network.
messages is set to 1 so that the queries will not be forwarded to
o leave a multicast group are shown below:
join a group
A
A host will send a
“leave”
report when it w
Multicast routers send IGMP queries (to the all-hosts grou
whether any group members exist on their sub networks. If there is no res
the router assumes that there are no grou
The Time-to-Live (TTL) field of query
other sub networks.
IGMP version 2 introduces some enhancements such as a method to elect a multicast queried for each
LAN, an explicit leave message, and query messages that are specific to a given group.
The states a computer will go through to join or t
Non-Member
Delaying Member
Idle Member
Leave Group
Leave Group
(Stop Timer)
Join Group
(Send Report,
Start Timer)
Query Received
(Start Timer)
Report Received
(Stop Timer)
Timer Expried
(Send report)
IGMP State Transitions
IGMP Snooping Configuration
The default status of the IGMP Snooping function is disabled. To turn on the IGMP Snooping, select
“Enable”
of the
IGMP Snooping Status
field and click on the
“OK”
button to save.