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PIM Overview
Note. The Join message is known as a (*,G) join because it joins group G for all sources to that group.
Receiver Designated
Router (DR)
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.
page 6-10
RP Router
Receiver 1
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
Configuring PIM
Sender 1
Legend
IGMP Join from Receiver
PIM Join Message from DR
March 2011
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