Method, device and system for establishing switching multicast distribution tree

Abstract

The embodiment of the invention discloses a method for establishing a switching multicast distribution tree (a public network forwarding tunnel) in a multicast virtual private network (VPN). In the method, a provider edge (PE) at a source end sends a switching message containing a switching group address to a downlink PE along a share-multicast distribution tree (share-MDT), wherein the switching message is used for establishing the switching multicast distribution tree; and a register message is sent to a rendezvous point (RP) in a public network before multicast streaming on the share-MDT starts to switch so as to trigger the RP in the public network and the PE at the source end to establish the switching multicast distribution tree with a PE at a receiving end. The embodiment of the invention also provides a corresponding device and system. By using the method, the switching multicast distribution tree can be established before the multicast streaming is switched to the switching multicast distribution tree from the share-MDT, thus the problem of packet loss of the multicast steaming can be avoided in the process of switching the multicast streaming to the switching multicast distribution tree from the share-MDT.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a method, device and system for establishing a switching multicast distribution tree in a multicast virtual private network. Background technique [0002] With the development of network technology, the entire network system has become larger and larger, and a large number of sub-network systems have also been produced. In order to realize data isolation between subnet systems and data intercommunication between subnet nodes in the same subnet system but in different geographic locations, virtual private network (VPN) technology has begun to be widely used. VPN uses tunnel technology to establish a dedicated data transmission channel on the backbone network to realize the transparent transmission of private network (subnet) protocol messages and data messages on the public network. [0003] With the widespread application of VPN technology, users have increasingly urgent...

AI Technical Summary

Problems solved by technology

In this way, there will inevitably be a small amount of packet loss during the switchover from Share-MDT to Switch-MDT

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