Planet WGSW-24040 User Manual page 139

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:
Delaying Member
IGMP Querier –
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is more
than one router/switch on the LAN performing IP multicasting, one of these devices is elected "querier" and assumes the
role of querying the LAN for group members. It then propagates the service requests on to any upstream multicast
switch/router to ensure that it will continue to receive the multicast service.
Multicast routers use this information, along with a multicast routing protocol such as
DVMRP or PIM, to support IP multicasting across the Internet.
Non-Member
Leave Group
(Stop Timer)
Join Group
(Send Report,
Start Timer)
Query Received
(Start Timer)
Report Received
(Stop Timer)
Timer Expried
(Send report)
Figure 4-9-4 IGMP State Transitions
User's Manual of WGSW-24040 / WGSW-24040R
Leave Group
Idle Member
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SGSW-24040 / SGSW-24040R