Device and method for service recovery

Abstract

The invention relates to a device and a method for recovering service. The device essentially comprises a path computation element (PCE) and network nodes. The method essentially comprises the steps that: the nodes reports network failure information to the PCE; the PEC calculates LSP route of recovered rerouting according to the saved network information, obtained failure information and the information of label switching path (LSP) influenced by the failure; according to the LSP route of the recovered rerouting, corresponding recovered LSP is established so as to realize the recovery of the service. Utilization of the method of the invention can ensures that when failure occurs to the network, the PCE establishes the optimal recovered rerouting and shortens the time of rerouting according to the obtained network topology information of the whole network, the link information, the LSP information and the failure information reported by the nodes.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a device and method for service restoration. Background technique [0002] The service recovery technology in the network is an important technology to improve network reliability and network resource utilization. Service recovery is different from service protection. Service recovery does not need to reserve protection resources for the working LSP (Label Switching Path, Label Switching Path), but When the working LSP fails, dynamically calculate an available LSP that can bypass the fault point, so as to realize service rerouting and service recovery. The above service recovery technology greatly increases the reliability of the network on the basis of improving resource utilization. [0003] An implementation scheme of a service recovery technology in the prior art is: after a link fails, the head node of the LSP performs LSP rerouting and initiates a service recovery oper...

AI Technical Summary

Problems solved by technology

[0006] In the process of realizing the present invention, the inventors found that when the network scale of the above-mentioned implementation scheme of the service recovery technology in the prior art is large, the network topology information saved on each network element (such as the above-mentioned node A and node C) may not be comprehensive , which may cause the network element to fail to calculate the LSP recovery route

[0007] In this scheme, multiple LSP recovery routes are calculated by different source nodes at the same time, and there is no coordination among the source nodes, which may lead to conflicts between the LSP recovery routes calculated by each source node, or non-optimal LSP recovery routes

In addition, in this solution, even if the calculated LSP recovery route overlaps with the source LSP route, the recovery LSP must be re-established from the source node through signaling, which will prolong the service recovery time

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