Planet Networking & Communication WGSW-2840 User Manual page 59

A host sends an IGMP "report" to
A host will never send a report when it wants to leave a group (for version 1).
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
Delaying Member
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.
join a group
ants to leave a group (for version 2).
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:
Non-Member
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
p address: 224.0.0.1) periodically to see
ponse from a particular group,
Leave Group
Idle Member