Heavy route method for fast searching path in T-MPLS network

A path and routing technology, applied in the direction of data exchange network, data exchange through path configuration, digital transmission system, etc., can solve the problem of occupying large network resources, and achieve the effect of saving consumed resources and fast rerouting recovery

Inactive Publication Date: 2008-07-30
BEIJING UNIV OF POSTS & TELECOMM
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Both of these methods use a pre-established backup path to pr...

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  • Heavy route method for fast searching path in T-MPLS network
  • Heavy route method for fast searching path in T-MPLS network
  • Heavy route method for fast searching path in T-MPLS network

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[0022] specific implementation plan

[0023] Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and detailed descriptions of known functions or configurations included herein or shown in the accompanying drawings are omitted to avoid unnecessarily obscuring the subject matter of the present invention. describe.

[0024] Under normal circumstances, services in the T-MPLS network are forwarded according to the allocated label switching path LSP. The following will describe the process of quickly finding a rerouting path for a faulty downstream neighbor node when a network fault occurs, and realizing rapid service recovery.

[0025] Figure 1 shows the transmission of packets over the network in a T-MPLS network to which fast rerouting can be applied.

[0026] Figure 1 shows that the service LSP is LSR1 → LSR2 → LSR3 → LSR4 → LSR5 → LSR6; A route detection packet (reroute packet), that is, R4 sends a rer...

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Abstract

The invention relates to a heavy-route strategy used for protecting and recovering a LSP path in the T-MPLS network, the mechanism provides a novel heavy-route protecting and recovering method used for quickly searching the path in the T-MPLS network, through a joint route and a signaling process, based on the detecting signal of a RSVP-TE signaling expand heavy-route, after the failure occurs, the detecting signal is flowed by adjacent nodes at the backward position of the failure, according to the forwarding strategy of each node and the decision rule, whether the node is an effective node on the protected LSP is judged, if the node is an effective node on the protected LSP, the establishing request of the heavy route path is performed, otherwise, the flowage is performed continuously. Through adopting the method, the protected path can be quickly searched after the failure of the network occurs, therefore, the bandwidth resource and the label resource in the T-MPLS network are saved, the interrupting time of traffic flow is greatly reduced, the recovering speed of the traffic flow is improved, the quick heavy-route and the protection and recovery of a traffic path is realized, and the demand of the real traffic is satisfied.

Description

[0001] Field [0002] The invention relates to a rerouting protection recovery method when a metropolitan area transmission network fails, and more specifically relates to a rerouting protection recovery method for quickly finding a path when a T-MPLS network fails. Background technique [0003] Network survivability mechanisms can be classified from different angles, mainly including the following classification methods: according to the recovery granularity, they are divided into link-based and channel-based protection / restoration mechanisms; according to whether the protection resources can be shared, they are divided into dedicated and shared protection mechanism; according to the calculation method of the recovery path, it is divided into pre-computation and real-time calculation recovery; according to the route calculation mechanism and the control mechanism of recovery realization, it is divided into centralized and distributed control recovery. [0004] With the contin...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/28H04L12/24H04L45/50
Inventor 尧昱梁伟李彬张永军黄善国顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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