A method and device and system for quick rerouting in MPLS network

Abstract

The invention provides a MPLS network quick rerouting realization method, device and system. The invention pertains to the communication field. The invention mainly comprises establishing protection LSP (label switched path) in the ring network topology by the source node of the protection LSP between the protection ring and the working LSP destination node so that the protection LSP can be used for realizing fast rerouting ring protection. Thus, the invention can realize fast rerouting protection of a plurality of nodes and link circuits only by establishing one protection LSP in the ring network topology. In prior art, a plurality of protection LSP is needed to realize fast rerouting protection of a plurality of nodes and link circuits. Therefore, information storage amount in node equipment is effectively reduced and bandwidth resource occupation in realizing fast rerouting protection can also be reduced.

Description

Technical field [0001] The present invention relates to the technical field of network communication, in particular to a method and system for realizing fast rerouting for MPLS (Multi-Protocol Label Switching). Background technique [0002] MPLS is a system used for fast data packet switching and routing. It provides network data traffic with goals, routing, forwarding, and switching capabilities. In order to improve the reliability of information transmission in MPLS networks, the IETF (Internet Engineering Task Force) has proposed a fast rerouting mechanism. The fast rerouting technology uses the capability of MPLS traffic engineering to provide fast protection switching capability for LSP (label switched path). [0003] The specific implementation process of MPLS fast rerouting includes: pre-establishing a local backup path as a protection LSP. The protection LSP requires that it will not be affected by link or node failures, so that when a failure occurs, a link or node failu...

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Problems solved by technology

[0011] When the above-mentioned existing rerouting protection technology is applied to a ring topology network, point-to-point LSP fast rerouting can be realized. However, it is not difficult to see that in the prior art, in order to protect the working LSP, it is necessary to remove the destination node of the working LSP Each node outside the network establishes a corresponding protection LSP for its downstream links or nodes. Therefore, to provide reliable protection, it is necessary to establish multiple protection LSPs, which will inevitably lead to complex implementation and network occupation in the process of providing protection for working LSPs. The problem with more resources

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