Method and device for realizing multicast in layered virtual private area network service network

Abstract

Embodiments of the present invention provide a method and device for realizing multicast in a layered virtual private area network service network. In the method and device for implementing multicast in the H-VPLS network provided by the embodiments of the present invention, a P2MP LSP is respectively established for at least two PW attributes corresponding to the same VSI, and the leaf nodes included in each P2MP LSP are not The same, and both include the root node; when receiving the multicast message to be forwarded sent by the source node, forward the multicast message to be forwarded through other P2MP LSPs except the P2MP LSP with the source node as the leaf node , thereby avoiding the formation of loops when forwarding multicast packets, and improving the multicast forwarding performance when the P2MP LSP technology is used in the H-VPLS network.

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 is moved 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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