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Method for establishing recovery type path of different faults in one communication network

A technology of communication network and establishment method, which is applied in the field of fault recovery, and can solve the problem that segmented time-slots cannot be considered, etc.

Inactive Publication Date: 2003-08-20
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For failure recovery purposes, segmented time-slots cannot be considered

Method used

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  • Method for establishing recovery type path of different faults in one communication network
  • Method for establishing recovery type path of different faults in one communication network
  • Method for establishing recovery type path of different faults in one communication network

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Embodiment Construction

[0049] Referring to FIG. 1, there is shown an optical communication network of a first embodiment of the present invention comprising a network controller 1 and a plurality of nodes A to F interconnected by links in a mesh structure. For example, nodes A and B are interconnected by a link AB in the direction from node A to node B and by a link BA in the direction from node B to node A. In this embodiment, it is assumed that a path is established in a single direction from a start node to a terminal node. All links are denoted by SRLG (Shared Risk Link Group) identifiers G1 to G7. A bundle of links grouped under the same G1 includes, for example, the links AB, BA, AC and CA. All nodes are connected to a network controller 1 including a CPU 11 and a memory 12 via a control channel 100 .

[0050] A typical example of a structure of working paths and protection paths is established in the network of FIG. 1 . Assume that a working path 301 of restoration type "1+1" is establishe...

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Abstract

In a communications network where multiple shared risk link groups are formed by links having a common risk, unreserved bandwidths are defined corresponding to all SRLG's and a maximum bandwidth of each link is set as an initial value of each of the defined unreserved bandwidths when a working path or a protection path of "1+1" or "1:1" recovery type is requested. When a protection path of "shared" recovery type is requested, unreserved bandwidths are defined corresponding to the SRLG's to which the links of its corresponding working path belong and a maximum bandwidth of each link is set as an initial value to each of the defined unreserved bandwidths. The bandwidth of the working or protection path is subtracted from each of the unreserved bandwidths. The request is rejected if a minimum of the subtracted values is smaller than a threshold.

Description

technical field [0001] The present invention relates to fault recovery methods, and more particularly to a path establishment method capable of recovering a mesh network from a fault using different fault recovery types. Background technique [0002] In public communication networks, failure recovery is an indispensable task. Mesh network architectures have gained wide acceptance due to their multifaceted failover features. A fault recovery method using GMPLS (Generalized Multi-Protocol Label Switching: Generalized Multi-Protocol Label Switching) technology in a mesh network is published in the Internet draft "Generalized Multi-Protocol Label Switching" in IETF (Internet Engineering Task Force) by Eric Mannie It is described in "draft-ietf-ccamp-gmpls-architecture-01.txt" (hereinafter referred to as document 1) in Label Switching (GMPLS) Architecture". According to Chapter 12 of Document 1, failure recovery methods are classified into protection and recovery modes. In pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L45/24H04J14/02H04L1/22H04L45/243H04L45/247H04Q11/00
CPCH04J14/0294H04Q2011/0086H04J14/0284H04Q2011/0081H04J14/0295H04J14/0228H04L1/22H04Q2011/0088H04J14/0227
Inventor 石桥修末村刚彦
Owner NEC CORP
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