Planet IGS-801 [84/120] User s manual of igs 801m

Planet IGS-801 [84/120] User s manual of igs 801m
User’s Manual of IGS-801M
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 Rece
(Stop Ti
ived
mer)
Timer Expried
(Send report)
IGMP Querie
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is
more than on r/sw multicasting, one of these devices is elected “querier” and
assumes the quer t then propagates the service requests on to any
upstream multicast switch/router to ensure that it will continue to receive the multicast service.
Figure 4-7-4 IGMP State Transitions
r –
e route itch on the LAN performing IP
role of ying the LAN for group members. I
Multicast routers use this information, along with a multicast routing protocol such as
rt IP multicasting across the Internet. DVMRP or PIM, to suppo
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