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PIM Overview Configuring PIM
page 7-10 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
Note. The Join message is known as a (*,G) join because it joins group G for all sources to that group.
Note. Depending on the network configuration, multiple routers may exist between the receiver’s DR and
the RP router. In this case, the (*, G) Join message travels hop-by-hop toward the RP. In each router along
the way, the multicast tree state for group G is instantiated. These Join messages converge on the RP to
form a distribution tree for group G that is rooted at the RP.
PIM Join Message from DR
Legend
Sender 1
Receiver 1
RP Router
Receiver Designated
Router (DR)
IGMP Join from Receiver