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RPF Checks
The routing table used for RPF checks can be the
same routing table used to forward unicast IP packets, or it can be
a separate routing table used only for multicast RPF checks. In either
case, the RPF table contains only unicast routes, because the RPF
check is performed on the source address of the multicast packet,
not the multicast group destination address, and a multicast address
is forbidden from appearing in the source address field of an IP packet
header. The unicast address can be used for RPF checks because there
is only one source host for a particular stream of IP multicast content
for a multicast group address, although the same content could be
available from multiple sources.
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