Reverse Path Forwarding is a method used by multicast routers to avoid routing loops in multicast network. A multicast router will not forward the multicast traffic to other router untill it passes RPF Check.
Whenever the router receives the multicast packet it checks source ip address of multicast packet, if the source ip address is matching with the interface which is present in the routing table then RPF is successful.
It means Multicast traffic will not be accepted on the router interface untill that is the outgoing interface to forward the traffic in routing table.
In this Diagram,R3 is receiving the multicast traffic from R1 and R2 for multicast group 226.1.1.1. Here source is the server which is sending the multicast traffic (10.1.1.0) and destination is multicast IP address( 226.1.1.1). Now R3 will check the routing table for the source IP address, and the interface s0/1 is going to pass RPF check. R3 will accept the multicast traffic from R1 and it drops the multicast traffic from R2, by this it saves the bandwidth.
Whenever the router receives the multicast packet it checks source ip address of multicast packet, if the source ip address is matching with the interface which is present in the routing table then RPF is successful.
It means Multicast traffic will not be accepted on the router interface untill that is the outgoing interface to forward the traffic in routing table.
In this Diagram,R3 is receiving the multicast traffic from R1 and R2 for multicast group 226.1.1.1. Here source is the server which is sending the multicast traffic (10.1.1.0) and destination is multicast IP address( 226.1.1.1). Now R3 will check the routing table for the source IP address, and the interface s0/1 is going to pass RPF check. R3 will accept the multicast traffic from R1 and it drops the multicast traffic from R2, by this it saves the bandwidth.
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