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Initial SA message sent when source first registers
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May
optionally encapsulate first data packet
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Subsequent SA messages periodically refreshed every
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60 seconds as long as source still active by originating
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RP
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Other MSDP peers dont originate this SA but only
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forward it if received
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SA messages cached on router for new group members
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that may join
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Reduced
join latency
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Prevent
SA storm propagation
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