Refer to the exhibit. Which interface(s) will show ip rpf 1.1.1.2 indicate as RPF interface(s)?

The correct answer is A. Ethernet 1/0. 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…

IP Multicast

Question

Exhibit

Options

AEthernet 1/0
BEthernet 0/0
CBoth Ethernet 0/0 and Ethernet 1/0
DRPF will fail

How the community answered

(37 responses)

A
78% (29)
B
3% (1)
C
14% (5)
D
5% (2)

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.

Topics

#RPF check#ip rpf command#multicast routing table#ECMP multicast

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