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Neighboring PIM-SM routers multicast periodic “Hello” messages
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to each other - default 30 secs.
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Hello-interval
tunable for faster convergence
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On receipt of a Hello message
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a router stores the IP address and
priority for that neighbor
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Router with highest IP address is selected as the DR, if the
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priorities match
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When DR goes down:
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new
one selected by scanning all neighbors on the interface and choosing
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the
one with the highest IP address
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DR sends
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“Join/Prune”
messages toward the RP from receiver network
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“Register”
messages toward the RP from source network
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