PLANET WGSW-5242 - Manual (Page 86)

User’s Manual of WGSW-5242
86
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 4-6-4
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 r outers u se t his i nformation, al ong w ith a multicast r outing protocol s uch as
DVMRP or PIM, to support IP multicasting across the Internet.
4.6.2 Static Multicast
Static multicast groups provides a way to add and delete multicast addresses in the L2 address table.