Reverse-path forwarding
Multicast routing technique to minimize loops and enhance security / From Wikipedia, the free encyclopedia
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Reverse-path forwarding (RPF) is a technique used in modern routers for the purposes of ensuring loop-free forwarding of multicast packets in multicast routing and to help prevent IP address spoofing in unicast routing.[1]
This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (May 2019) |
In standard unicast IP routing, the router forwards the packet away from the source to make progress along the distribution tree and prevent routing loops. In contrast, the router's multicast forwarding state runs more logically by organizing tables based on the reverse path, from the receiver back to the root of the distribution tree at the source of the multicast. This approach is known as reverse-path forwarding.