Method for establishing return tag exchange route in multiprotocol tag exchange system

A label switching path, multi-protocol label technology, applied in transmission systems, electrical components, etc., can solve problems such as protection switching failure and fault information transmission

Inactive Publication Date: 2006-08-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Since the return LSP determined by the routing algorithm is likely to overlap with the working LSP, that is, the return LSP is established along the opposite direction of the working LSP, so that once the overlapping network fails, the sink node sends The fault information cannot be correctly transmitted to the source node through the return LSP, which eventually leads to the failure of protection switching

Method used

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  • Method for establishing return tag exchange route in multiprotocol tag exchange system
  • Method for establishing return tag exchange route in multiprotocol tag exchange system

Examples

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Embodiment 1

[0035] The establishment method of returning LSP described in this embodiment includes the following steps:

[0036] Step 101: The source node sends an LSP establishment request with an explicit routing object to initiate establishment of a backup LSP, and each LSR in the backup LSP path establishes the backup LSP according to the path recorded in the explicit routing object.

[0037]According to the protocol, the source node in the MPLS network can establish an LSP by displaying the route. In this manner, the source node predetermines the path of the backup LSP, records the path in the explicit routing object of the LSP establishment request, and sends it to the next-hop LSR recorded in the explicit routing object. During the establishment of the backup LSP, each LSR establishes the forwarding path of the backup LSP according to the next-hop LSR recorded in the displayed routing object, and finally establishes the backup LSP according to the path recorded in the displayed rou...

Embodiment 2

[0043] The establishment method of returning LSP described in this embodiment includes the following steps:

[0044] Step 201: The source node sends an LSP establishment request with a recorded routing object to initiate the establishment of a backup LSP, and each LSR in the backup LSP path establishes a backup LSP according to a routing algorithm, and records the path of the backup LSP in the recorded routing object.

[0045] According to the protocol, the source node in the MPLS network can also initiate the establishment of a backup LSP in a hop-by-hop manner. In this way, each LSR in the LSP establishment process determines the next-hop LSR according to a certain routing algorithm. At this time, if the record routing object is carried in the LSP establishment request, each LSR in the establishment process will record its next-hop LSR, that is, the forwarding path in the record routing object. Therefore, when the backup LSP is established, that is, when the LSP establishme...

Embodiment 3

[0052] Step 301: the sink node sends an LSP establishment request with an explicit routing object to initiate establishment of a backup LSP, and each LSR on the backup LSP establishes the backup LSP according to the explicit routing object;

[0053] Step 302: After the backup LSP is established, the source node learns the path of the backup LSP in the MPLS network through the display route object in the LSP establishment message;

[0054] Step 303: The source node returns the display routing object in the LSP establishment request according to the reverse direction of the path of the backup LSP, that is, according to the sequence of all LSRs on the backup LSP path, arranges all LSRs in the reverse direction, and records them in the display routing object in sequence object, at this time, the path recorded in the display routing object is the reverse path of the backup LSP;

[0055] Step 304: The source node sends an LSP establishment request with the explicit routing object co...

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Abstract

A method for setting up switching path of return countermark in multiprotocol countermark switching system includes utilizing the last node to record path of standby countermark switching path after said path is set up, building up display route object by said node according to recorded reverse path of said path, sending request of setting up countermark switching path with said display route object and issuing said path, setting up said return countermark switching path by each node on said path according to said display route object.

Description

technical field [0001] The invention relates to a protection method for a label switching path (LSP, Label Switch Path) in a multi-protocol label switching (MPLS, Multi-protocol Label Switching) technology, in particular to a method for establishing a return LSP in a multi-protocol label switching system. Background technique [0002] MPLS technology is a new routing and switching technology that can provide high-speed and reliable data packet transmission. IP routers using MPLS technology, ATM, and Frame Relay (FR, Frame Relay) switches are collectively called Label Switch Routers (LSR, Label Switch Router), and a transmission channel composed of a group of LSRs connected together is called LSP. In order to ensure that the message can be correctly transmitted to the destination node, the MPLS network usually adopts the 1+1 protection mode or 1:1 protection mode commonly used in general networks to protect the LSPs in the network. [0003] In the 1+1 protection mode, the MP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06
CPCH04L45/22H04L45/50H04L45/28H04L45/02
Inventor 卢超刚符伟权星月李晓东何健飞
Owner HUAWEI TECH CO LTD
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