A method, device and system for establishing a multicast distribution tree across VPNs

Abstract

The invention discloses a method for establishing a multicast distribution tree in a mode of inter-virtual private network (VPN), equipment and a system thereof. The method comprises the following steps that: when receiving bootstrap messages (BSM) published by a bootstrap router (BSR) in a first VPN, a first provider edge (PE), which is responsible for forwarding the message inter-VPN, floods on all multicast interfaces in virtual routing and forwarding (VRF) information of the first VPN and the VRF information of the each second VPN of the BSM according to the preconfigured VRF information of the first VPN and the VRF information of the each second VPN associated with the first VPN; customer edges (CEs) in the first VPN and the second VPN learn rendezvous point (RP) information which is in the received BSM; the CEs in the first VPN and the second VPN send Joint messages to the learned RP so as to construct the multicast distribution tree in the mode of inter-VPN. By using the invention, in the current multicast VPN outside network application, a problem of large network maintenance workload caused by static configuration of the RP can be solved and single point faults are not easy to be formed.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a method, device and system for establishing a multicast distribution tree across VPNs. Background technique [0002] A virtual private network (Virtual Private Network, VPN) refers to providing users with dedicated communication links on a public network. These dedicated communication links do not need to be realized by setting up dedicated physical links, so it is called a virtual private network. [0003] The VPN consists of an edge device (Provider Edge, PE) of the operator network, a core router (Provider, P) of the operator network, and an edge device (Customer Edge, CE) of the customer network. The PE is connected to the CE, and it puts the user network data arriving on the CE on the public network for transmission (the PE at this position is called the ingress PE); and it also transmits the message carrying the user network data from the public network through the CE ...

AI Technical Summary

Problems solved by technology

[0010] The embodiments of the present invention provide a method, device and system for establishing a multicast distribution tree across VPNs, which are used to solve the problem of heavy network maintenance workload due to the static configuration of the RP in the existing multicast VPN extranet application , and it is easy to form a single point of failure problem

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