Method and device for realizing multicast in hierarchy of virtual private LAN (Local Area Network) service (H-VPLS) network

Abstract

The embodiment of the invention provides a method and a device for realizing multicast in hierarchy of a virtual private LAN (Local Area Network) service (H-VPLS) network. According to the method and the device for realizing multicast in the H-VPLS network provided by the embodiment of the invention, a P2MP LSP (Point-to-MultiPoint Layered Service Provider) is established for at least two PW (Pseudo Wire) attributes corresponding to the same VSI (Virtual Switch Instance) respectively, and all leaf nodes included by each P2MP LSP are different and all comprise root nodes; when a multicast message to be forwarded transmitted by a source node is received, the multicast message to be forwarded is forwarded by other P2MP LSPs other than the P2MP LSP with the source node as the leaf node, so that a loop is prevented from being formed during forwarding of the multicast message, and the multicast forward performance during adoption of the P2MP LSP technology in the H-VPLS network is improved.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method and device for implementing multicast in a Hierarchy of Virtual Private LAN Service (H-VPLS for short) network. Background technique [0002] Virtual Private LAN Service (VPLS) is a Layer 2 Virtual Private Network (VPN) technology based on Multi-Protocol Label Switching (MPLS) and Ethernet technology. VPLS can enable users to simultaneously access the network from multiple geographically dispersed nodes and access each other, and make the connection effect between each node as if it is connected to a LAN. When VPLS forwards BUM (broadcast, unknown unicast, multicast) messages, it uses copy processing at the ingress node, and copies BUM messages on pseudowires (Pseudo Wire, PW). If there are multiple PWs using a shared When using a common path, multiple BUM packets will appear on the shared path, resulting in a waste of bandwidth. The traditional V...

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Problems solved by technology

However, in the scenario where PE-AGG is the root and all UPEs are leafs to establish a P2MP LSP, when UPE1 needs to access UPE3, after the unknown unicast traffic sent by UPE1 reaches PE-AGG, PE-AGG directly forwards the unknown unicast traffic to Import P2MP LSP; because the replication point of the traffic in the P2MP LSP moves down to the branch node, that is, close to the service provider side PE equipment (Service PE, SPE), therefore, the branch node SPE node cannot complete the pruning operation, resulting in the ingress The unknown unicast traffic of the P2MP LSP will be forwarded to UPE1 and UPE2, forming a loop

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