A method and system for realizing cross-virtual private local area network multicast

Abstract

The invention discloses a method and system for realizing cross-virtual private local area network multicast, which can configure the mapping relationship between multicast group, multicast source and multicast VFI; search for the multicast group requested by the multicast user according to the mapping relationship The multicast VFI to which it belongs; maintain the multicast forwarding table according to the found multicast VFI. The method and system of the present invention can realize cross-VFI multicast in the two-layer network equipment, and can accurately distinguish the multicast source requested by the user from the multicast group of the multicast VFI, thereby solving the problem of when a multicast user requests the same multicast group When using multicast data from different multicast sources, the multicast data stream cannot be accurately forwarded to multicast users; effectively reduces the network load and system overhead of the multicast source server for copying multicast data streams, and improves the bandwidth of network devices Utilization rate and other performances; and, by mapping multicast groups and multicast sources to corresponding multicast VFIs, the accuracy of multicast data stream 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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