Method and system for realizing multicasting between virtual private networks

Abstract

The invention discloses a method for realizing the multicasting between virtual private networks. The corresponding relationship of a provider edge (PE) of a user side and the virtual private network (VPN) in which the data source is located is established when a routing entry of the requested source data is not found in the VPN in which the user is located, and the routing entry of the requested source data is found in other VPNs by the provider edge (PE) of the user side; an adding message is sent and is added into a public network multicasting network of the VPN in which the source data is located; and a public network message of the source data packed by the source data PE is received by the PE of the user side according to the corresponding relationship of the PE of the user side and the VPN in which the source data is located, the public network message is packed, and the source data is sent to the user. The invention also discloses a system for realizing the multicasting between the VPNs, thus realizing the multicasting across the VPNs, and solving the application problem of the public source.

Description

technical field [0001] The invention relates to the multicast technology of communication network, in particular to a method and system for realizing multicast among virtual private networks. Background technique [0002] Existing Internet technology is becoming more and more mature, and its scale is also increasing, and the realization of virtual private network (VPN, Virtual Private Network) is becoming more and more common. VPN applications have reached a very popular level. However, the unicast VPN service is increasingly unable to meet the needs of network development. While multicast is developing rapidly, in order to meet the needs of multicast VPN, the demand for multicast VPN is also showing an urgent trend. [0003] The existing Border Gateway Protocol / Multiprotocol Label Switching (BGP / MPLS) VPN solution solves the realization of unicast VPN, but this method is only suitable for unicast, and cannot be well realized for multicast VPN. The multicast VPN implementa...

AI Technical Summary

Problems solved by technology

[0007] However, the obvious disadvantage of the existing MD implementation is that each VPN can only perform multicast in its own MD, and cannot realize multicast across VPNs. That is to say, if a user in VPN2 wants to receive data from a source in VPN1, This can only be achieved unless a separate VPN MD is configured for the source in VPN1 and the user in VPN2

[0008] It can be seen from this that although the application of MD solves the basic problem of implementing multicast in VPN, there is a limit to the implementation of multicast across VPNs for the application of public sources; while using multiple MD deployments to solve the application of public sources, The configuration is complicated, and as more and more MDs are configured, since each MD consumes a public network multicast address, the available range of public network multicast addresses will become less and less, which makes the planning of cross-VPN multicast more and more difficult

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