
User’s Manual of LRP-822CS/LRP-1622CS
167
sages 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:
message, and query mes
Figure 4-7-6
IGMP State Transitions
IGMP Quer
A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is more
than one rou
tch o
g, 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
ier –
ter/swi
n the LAN performing IP multicastin
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
ternet.
DVMRP or PIM, to support IP multicasting across the In
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