Reverse path forwarding (RPF) checking method and device

The embodiment of the invention discloses an RPF checking method. The method comprises the following steps: after receiving a multicast data message from a head node, a tail node can obtain a multicast source address, a multicast group address and packaging information carried in the multicast data message; and then, according to the multicast source address, the multicast group address and the first corresponding relation, obtaining a first identifier used for identifying an upstream multicast next hop UMH node corresponding to the multicast data message; in addition, the tail node can obtain a second identifier used for identifying the head node corresponding to the multicast data message according to the packaging information of the multicast data message and the second corresponding relation; finally, after the first identifier and the second identifier are obtained, the tail node can perform RPF check according to the first identifier and the second identifier. In the embodiment of the invention, the dat