Traffic classes differentiated (TCD) failure recovery method based on multi-protocol label switching technology (MPLS-TE)

Abstract

The invention discloses a traffic classes differentiated (TCD) failure recovery method based on a multi-protocol label switching technology (MPLS-TE). The method comprises an off-line processing stage and an on-line processing stage. In the off-line processing stage, by using a TCD algorithm, a label switched path (LSP) state information base is established and maintained in a network initialization stage, wherein the LSP state information base comprises an LSP identifier (ID), a main path, a backup path, a service flow attribute, a maintenance priority attribute and an establishment priority attribute and is used for subsequent flow switching and resource preemption. Two steps of flow switching and resource preemption are executed in the on-line processing stage. By adoption of the TCD algorithm, different failure recovery requirements of different service flows can be differentiated. The TCD algorithm has lower packet loss rate, shorter failure recovery time and higher resource utilization efficiency, and is superior to the conventional failure recovery algorithm.

Description

technical field [0001] The invention relates to an MPLS-TE-based traffic class-differentiated fault recovery method, which belongs to the technical field of communication. Background technique [0002] With the rapid increase of data traffic and users in the network, people's dependence on the network is increasing, and the reliability of the network is becoming more and more prominent. Therefore, network survivability technology emerges as the times require. The survivability of the network mainly refers to the ability of the network to automatically restore the services affected by the failure after the failure of nodes and links without human intervention. MPLS (Multi-Protocol Label Switching), as the next-generation core network switching technology, can not only provide more effective QoS (Quality of Service) guarantees and traffic engineering than traditional IP networks through label switching algorithms, but also has strong network survivability ability. The protec...

AI Technical Summary

Problems solved by technology

[0021] The algorithm proposed by this invention combines the advantages of the existing Makam algorithm and Haskin algorithm, and introduces the bandwidth preemption mechanism in DiffServ, which puts the minimization of link interruption and bandwidth in the first place, and solves the problems of previous fault recovery algorithms. The problem of bandwidth service degradation of high-level business flows after fault recovery fully ensures that high-priority data flows can be restored first, and at the same time ensures that the preempted data flows can maintain their basic QoS requirements to the greatest extent

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