Refer to the exhibit.
Which interface(s) will show ip rpf 1.1.1.2 indicate as RPF interface(s)?
A.
Ethernet 1/0
B.
Ethernet 0/0
C.
Both Ethernet 0/0 and Ethernet 1/0
D.
RPF will fail
Explanation:
When troubleshooting multicast routing, the primary concern is the source address. Multicast has
a concept of Reverse Path Forwarding check (RPF check). When a multicast packet arrives on an
interface, the RPF process checks to ensure that this incoming interface is the outgoing interface
used by unicast routing to reach the source of the multicast packet. This RPF check process
prevents loops. Multicast routing does not forward a packet unless the source of the packet
passes a reverse path forwarding (RPF) check. Once a packet passes this RPF check, multicast
routing forwards the packet based only upon the destination address.http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094b55.shtml