Planet Networking & Communication WGS3-24000 User Manual page 114

The Time-to-Live (TTL) field of query messages is set to 1 so that the queries will not be forwarded to 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 to leave a multicast group are shown below:
Leave Group
(Stop Timer)
Join Group
(Send Report,
Start Timer)
Delaying Member
IGMP State Transitions
Non-Member
Leave Group
Query Received
(Start Timer)
Report Received
(Stop Timer)
Timer Expried
(Send report)
Idle Member
114