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User’s Manual of FGSW-2620VM / FGSW-2620PVM
98
The states a computer will go through to join or to leave a multicast group are shown below:
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)
Figure 4-8-4: IGMP State Transitions
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.