Operation Manual – Multicast
H3C S3100 Series Ethernet Switches Chapter 1 Multicast Overview
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z A multicast packet from Source arrives to VLAN-interface 1 of Switch C, and the
corresponding forwarding entry does not exist in the multicast forwarding table of
Switch C. Switch C performs an RPF check, and finds in its unicast routing table
that the outgoing interface to 192.168.0.0/24 is VLAN-interface 2. This means that
the interface on which the packet actually arrived is not the RPF interface. The
RPF check fails and the packet is discarded.
z A multicast packet from Source arrives to VLAN-interface 2 of Switch C, and the
corresponding forwarding entry does not exist in the multicast forwarding table of
Switch C. The router performs an RPF check, and finds in its unicast routing table
that the outgoing interface to 192.168.0.0/24 is the interface on which the packet
actually arrived. The RPF check succeeds and the packet is forwarded.
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