Reverse path forwarding (RPF) checking method and device

Abstract

The embodiment of the invention discloses an RPF checking method, and the method comprises the steps: enabling a tail node to obtain a multicast source address, a multicast group address and packaginginformation carried in a multicast data message after the tail node receives the multicast data message from a head node; and then, according to the multicast source address, the multicast group address and the first corresponding relationship, a first identifier is acquired for identifying an upstream multicast next-hop UMH node corresponding to the multicast data message. In addition, a tail node can also obtain a second identifier for identifying the head node corresponding to the multicast data message according to the encapsulation information of the multicast data message and the secondcorresponding relationship. 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 theembodiment of the invention, the data length of the first identifier and the data length of the second identifier are both smaller than 128 bits, so that in the embodiment of the invention, two piecesof data smaller than 128 bits can be compared, and RPF check is simplified.

Description

technical field [0001] The present application relates to the communication field, in particular to a reverse path forwarding RPF check method and device. Background technique [0002] Currently, a virtual private network (virtual private network, VPN) may be deployed on a network edge node (provider edge, PE) of a core network provided by an operator. Correspondingly, the VPN instance can be used to process multicast services. Wherein, the multicast service can send a multicast data packet from one PE to one or more other PEs in the multicast group. [0003] In practical applications, when a multicast data packet is sent from one PE to multiple other PEs, the PE receiving the multicast data packet, such as the tail node, needs to perform Reverse path forwarding (RPF) check. The tail node determines whether to forward the multicast data message according to the check result. Wherein, the RPF check refers to determining whether the multicast data packet comes from a selec...

AI Technical Summary

Problems solved by technology

[0004] When the operator's network on which the VPN is deployed is an Internet protocol version 6 (IPv6) network, the RPF check performed by the tail node for the multicast service is relatively complicated.

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