Protection switching method in multiprotocol label switching system

Abstract

The invention discloses a method for protecting the switch of multiple-protocol label switch system, comprising that: any node of multiple-protocol label switch system detects the accidence, and searches the relative label switch path of said accidence; the node which has detected the accidence transmits the alarming instruction information to the source node of each relative label switch path; and said source node continuously receives the alarming instruction signals in relative number to start the switch-protect process. The invention can improve the speed of switch-protect process of label switch path to meet the demand of switch-protect process in the level of telecommunication.

Description

Technical field [0001] The present invention relates to a multi-protocol label switching (MPLS, Multi-protocol Label Switched) technology, in particular to a protection switching method in an MPLS system. Background technique [0002] Multi-protocol label switching (MPLS, Multi-protocol Label Switched) technology emerged in the mid-1990s. It focuses on the virtual path identifier (VPI) / virtual path identifier (VCI) in the asynchronous transfer mode (ATM). , Virtual ChannelIdentifier) ​​and other switching ideas, and seamlessly integrate the flexibility of IP routing technology and the simplicity of Layer 2 switching technology, thereby realizing the addition of MPLS connection-oriented features in connectionless IP networks. In the IP network system, multiple label switched paths (LSP, Label Switched Path) are established by using the MPLS technology to provide some management and operation methods for the IP network system. [0003] In fact, the key to MPLS technology is the int...

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Problems solved by technology

For example, the minimum frame length of an FFD frame is 44 bytes, plus two layers of label encapsulation (such as Ethernet encapsulation), the minimum frame length of an FFD frame will reach 64 bytes, and if it is to meet the requirements of the carrier class, it will be 64 bytes. Byte FFD frames are sent at a rate of 100 per second, and in one LSP, only FFD frames will occupy at least 64×8×100=51200bit / S bandwidth, so this protection switching method is not convenient for large-scale Promotion of OAM Function in MPLS Network System

Therefore, ITU-T Rec.Y.1711 stipulates that it is recommended to set the sending speed of FFD frames to 20 frames per second, but this will cause the detection time of LOCV faults to be as long as 150ms, that is, the sink node of the LSP needs at least 150ms delay to The completion of the protection switching process cannot meet the requirements of the carrier-class protection switching process within 50ms; it can be seen that the use of FFD frames to detect LOCV faults, and then complete the protection switching process, there is a contradiction between setting the FFD frame transmission speed and occupying too much bandwidth question

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