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Fast rerouting method and label exchange router

A label switching path and routing technology, applied in the communication field, can solve problems such as the inability to protect the CR-LDP path, achieve the effect of reducing message loss and improving reliability

Inactive Publication Date: 2009-02-18
HUAWEI TECH CO LTD
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  • Description
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Problems solved by technology

[0010] At present, the industry proposes the FRR-RSVPTE (Fast Rerouting-Resource Reservation Protocol Traffic Engineering) solution, which can use RSVP TE to implement fast rerouting. This technical solution can only meet the needs of RSVP-TE, a software description protocol, and cannot protect CR-LDP path

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  • Fast rerouting method and label exchange router
  • Fast rerouting method and label exchange router
  • Fast rerouting method and label exchange router

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Embodiment Construction

[0034] The embodiment of the present invention provides CR-LDP supporting fast rerouting. By extending CR-LDP and adding TLV (type-length-value) in the corresponding message, a tunnel can be established for CR-LDP LSP as a backup, and it can communicate with all For the above LSP binding, when a link or node failure occurs, the remote session is used at the first and last nodes of the backup tunnel to maintain the activity of the original path, and the first node of the original path is established with the same CR- The alternative path identified by the LDP switches the data flow to the alternative path for transmission, and withdraws the original path from the head node.

[0035] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] The flow process of the embodiment of the present invention is as figure 1 As shown, it includes the following steps: before performing the following steps, set link or nod...

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Abstract

The invention relates to quick heavy-route method and label switching router. The method comprises: setting standby path for label switching path based on constrained routing and binding with the label switching path, first node of label switching path receiving notice information with path protection type-length-value TLV from insert knot of standby path when the label switching path is in failure, switching data of failure path to standby path for label transmission. The inventive example provides a label exchange tunnel based on constrained condition as prefabricated standby path to protect CR-LSP and avoid link and node failure.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a fast rerouting method and a label switching router. Background technique [0002] MPLS (Multiprotocol Label Switching Protocol) is a general solution for dynamically designing and changing traffic to ensure sequential and time-controlled forwarding. In order to distribute network traffic smoothly and coherently, constraint-based routing can make path computation more conveniently controlled by constraints, such as bandwidth, management policies, routers' ability to handle events, and so on. [0003] The MPLS architecture (RFC3031) exploits the advantages of traffic engineering in two distinct ways. That is, run CR-LDP (Label Distribution Protocol based on Constrained Routing) or RSVP-TE (Traffic Engineering of Resource Reservation Protocol) on the core network. Among them, RSVP-TE is a protocol expressed in software, which uses IP datagrams to transmit signaling, thereb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/28H04L45/50
Inventor 爱德珍娜维地那特
Owner HUAWEI TECH CO LTD
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