Method and system for realizing across virtual private local area network multicast

Abstract

The invention discloses a method and a system for realizing across virtual private local area network multicast. The mapping relationship of a multicast group, a multicast source and a multicast VFI (Virtual Forward Instance) is configured; according to the mapping relationship, the multicast VFI to which the user-requested multicast group belongs is found; and according to the found multicast VFI, a multicast forward table is maintained. In the method and the system, across VIF multicast can be realized in two layer of network equipment, the multicast source requested by the user and the multicast group of the multicast VFI can be accurately distinguished so as to solve the problem that multicast dataflow can not be accurately forwarded to the multicast user when the multicast user broadcasts the multicast data in different multicast sources in the same multicast group; network load and system expenditure for the multicast source server to copy the multicast dataflow is effectively lowered, the performance, such as the bandwidth use ration and the like, of the network equipment can be improved; in addition, the multicast group and the multicast source are mapped to the corresponding multicast VFI; and the accuracy on multicast dataflow transmission is guaranteed.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for realizing multicasting across a virtual private local area network. Background technique [0002] VPN (Virtual Private Network, Virtual Private Network) is a technology that utilizes public network resources to establish a dedicated communication network, and is used to realize remote wide-area connections. VPLS (Virtual Private Lan Service, Virtual Private Network Service) is a layer-2 virtual private LAN technology based on MPLS (Multi-Protocol Label Switch, Multi-Protocol Label Switching) / IP network and Ethernet technology, and belongs to L2VPN (Layer 2 Virtual Private Network , Layer 2 virtual private network). VPLS connects users at different sites through a wide area network or a metropolitan area network, thereby forming a virtual local area network, and each virtual local area network is called a VFI (Virtual Forward Instance, virtual forwarding instance...

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Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a method and system for multicasting across virtual private local area networks, to solve the problem that multicast users and multicast sources are in different virtual private local area networks, and a multicast group has multiple When the multicast source is used, since the cross-VFI forwarding cannot be realized, the same multicast source duplicates multiple multicast data streams, resulting in a waste of bandwidth resources.

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