Method, device and system for establishing P2MP (point to multiple points)

Abstract

The embodiment of the invention discloses a method for establishing P2MP (point to multiple points) LSPs (label switched paths), comprising the following steps: the node receives a P2MP LSP establishment request message from an upstream node by the node, wherein, the request message carries the information of the P2P LSP needs to be transformed; the node judges whether the P2P LSP needing to be transformed exists on a first link according to the information of the P2P LSP needing to be transformed, and whether the first link is the link between the mode and the upstream node, if so, a resource of the P2PLSP on the first link is selected as the resource of the P2MP LSD on the first link, if not, a new resource is reserved as the resource of the P2MP LSP on the first link; the node sends the P2PMP LSP to the upstream node by the node to establish a first response message which indicates the resource of the P2P LSP on the first link; whether the P2P LSP needs to be transformed exists on the link is judged according to the information of the P2P LSP needing to be transformed in P2MP LSP establishment request message, if so, the bandwidth resource connected with the P2P LSP is reused, at the moment, the P2P LSP resource is not dismantled, thus realizing the uninterrupted transformation.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a P2MP establishment method, device and system. Background technique [0002] Point-to-multipoint (Point to Multi-Point, P2MP) multicast technology is a transmission technology that transmits services from a single sender to multiple receivers. P2MP technology was first applied in IP network. As people's demand for communication is getting higher and higher, demand for large-bandwidth multicast services such as video conferencing, video-on-demand, and multi-party database backup began to appear. To support these types of multicast services , it is necessary to establish and maintain a P2MP multicast tree in the transport network. A multicast tree refers to a unidirectional tree connection with fixed bandwidth between a source network element and multiple sink network elements in a transport network. The source network element of a multicast tree is usually called t...

AI Technical Summary

Problems solved by technology

[0006] In the existing technology, the conversion is realized by dismantling first and then building, that is, first dismantling the P2P LSP, releasing resources, and then recalculating and establishing the P2MP LSP connection from the source node to each leaf node. of disruptions impacting the customer experience

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