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What is RPF?
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A
router forwards a multicast datagram only if received on the up
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stream
interface to the source (i.e. it follows the distribution tree).
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The RPF Check
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The
source IP address of incoming multicast packets are
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checked
against a unicast routing table.
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If
the datagram arrived on the interface specified in the
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routing table for the source address; then
the RPF check
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succeeds.
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Otherwise,
the RPF Check fails.
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