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Method for preventing label switch path oscillating and interim label switching router

A label switching path and label switching technology, applied in data switching networks, digital transmission systems, electrical components, etc., can solve problems such as the inapplicability of LSP oscillation, and achieve the effect of saving system resource consumption, ensuring reliability, and reducing impact

Active Publication Date: 2009-10-07
NEW H3C TECH CO LTD
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  • Abstract
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Problems solved by technology

[0022] From the LSP revocation process in the independent mode, it can be seen that this kind of LSP revocation only occurs on the Transit LSR of the downstream LDP session DOWN. This kind of revocation to avoid the oscillation of the entire LSP is only applicable to the independent mode, and it is not applicable to the entire LSP oscillation caused by the revocation in the orderly mode.

Method used

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  • Method for preventing label switch path oscillating and interim label switching router
  • Method for preventing label switch path oscillating and interim label switching router
  • Method for preventing label switch path oscillating and interim label switching router

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Embodiment Construction

[0059] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0060] The present invention is a solution for preventing LSP oscillation, and its basic idea is: when the downstream LDP session is DOWN, the Transit LSR releases the FEC-label binding relationship issued from the LDP session, and does not immediately recycle the FEC-label issued upstream Instead, switch the local LSP corresponding to the released FEC-label binding relationship from Transit LSP to Proxy Egress LSP and maintain it for a period of time, and update the forwarding entry according to the switched local LSP

[0061] After the LSP is switched, it keeps forwarding normally according to the updated forwarding entry.

[0062] If the maintenance time of the Proxy Egress LSP exceeds the preset time, the Proxy EgressLSP will be revoked;

[0063] If the DOWN LDP session returns to normal before the maintenance time of the Proxy Egress LSP exceeds the ...

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Abstract

The present invention discloses a method for preventing label switch path oscillating and an interim LSR. In the method, when LDP session of the interim LSR is down in downstream, releasing an FEC-label binding relationship from the LDP session, a interim LSP corresponding to the released FEC-label binding relationship is switched as agent outlet and maintained for a period of time, and updating the transmitting item to keep normal transmission. If maintenance time of the agent outlet LSP exceeds a preset time, then repealing the agent outlet LSP; if the LDP session returns to normal before maintenance time of the agent outlet LSP exceeds a preset time, then reverting the agent outlet LSP to an interim LSP according to a re-announced FEC-label binding relationship of the downstream LDP neighbor, and updating the transmission item again. In this way, when a downstream session of the interim LSP is oscillating, repeated repealing and creation of the LSP is prevented.

Description

technical field [0001] The invention relates to network communication technology, in particular to a method for preventing LSP (Label Switched Path, label switching path) oscillation and a transit LSR (Label Switched Router, label switching router) for preventing LSP oscillation. Background technique [0002] MPLS (Multi Protocol Label Switch, Multi-Protocol Label Switching) is a classification and forwarding technology. MPLS classifies packets with the same forwarding behavior (for example, the same destination address, the same forwarding path, the same service level, etc.) into one class, and this class is called Forwarding Equivalent Class (FEC). Packets belonging to the same FEC will receive exactly the same treatment in the MPLS network. In the traditional IP forwarding scheme using the longest match algorithm, all packets to the same destination address are one FEC. In the MPLS system, a unique identifier, namely a label, is used to uniquely indicate the FEC to whic...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L29/06H04L45/50
Inventor 王蕊
Owner NEW H3C TECH CO LTD
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