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Method for setting path and node apparatus

A path setting and path technology, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problems of unable to automatically restore the path, difficult to confirm the normality of the main signal, communication service protection delay, etc.

Inactive Publication Date: 2008-03-05
HITACHI COMM TECH
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Problems solved by technology

Therefore, after the failure of the destination node is recovered, the path cannot be automatically restored
In addition, when the destination node cannot communicate under a failure state or the like, although it is difficult to confirm the normality of the main signal, by ensuring that the main signal traffic from the intermediate path to the destination node flows through the intermediate path, Therefore, there is a problem of delay in communication traffic protection, such as detection of a failure in the GMPLS network in the lower layer, and initiation of detour route selection in the lower layer.

Method used

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  • Method for setting path and node apparatus

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Embodiment Construction

[0039] Embodiments of the present invention will be described with reference to FIGS. 1 to 11 using the following examples. In addition, the same reference number is attached|subjected to the substantially same part, and description is not repeated. Here, FIG. 1 is a block diagram of a communication network. Fig. 2 is a detailed block diagram of a network structure within a communication network. Figure 3 is a block diagram of a GMPLS node. Figure 4 is a block diagram of a user node. Fig. 5 is a block diagram of a monitor control device. FIG. 6 is a transition diagram illustrating path opening processing. FIG. 7 is a flowchart of processing when routing to a GMPLS node. Fig. 8 is a diagram illustrating a message format of a mutual control protocol between nodes. Fig. 9 is a diagram explaining the object content of the inter-node mutual control protocol. Fig. 10 is a transition diagram illustrating forced path opening processing. Fig. 11 is a transition diagram illustra...

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Abstract

In a GMPLS node provided with inter-node control protocols including GMPLS, when an adjacent node is in a failure state, path establishment is automatically accomplished by providing a temporary reply to a path establishment request source node in response to a path establishment request, securing a source of an intermediate route, repeatedly transmitting a path establishment request to the adjacent node in the failure state according to specified conditions after completion of temporary path establishment, performing a path establishment process for the remaining section when the adjacent node recovers from the failure, and then transmitting a path establishment completion notification message to the request source node.

Description

technical field [0001] The present invention relates to a route setting method and a node device in an optical transmission system used in an optical transmission system used in a backbone network covering intercountries or within a country or in an urban network or a prefectural network, and particularly relates to a route setting method and a node device even when delivery to a destination is impossible. In the case of a signaling signal of a node, the route setting method and node device can also open a route to the immediately preceding node. Background technique [0002] In recent years, the research on the connection control technology between nodes in the transmission device is very active. As a technique for mutual control between nodes, there is a GMPLS (Generalized Multi-Protocol Label Switching) technique for opening a communication path using a label in a communication network constituted by a transmission device or the like. GMPLS technology is described in Non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/08H04L12/70
CPCH04L45/50H04L45/28H04L45/00H04L45/22
Inventor 铃木元树深代康之
Owner HITACHI COMM TECH
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