JP2003318969A - Network, node, and path setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce wait time of nodes and to quickly perform path setting. <P>SOLUTION: The node on a path receiving a path setting request from a sender side node transfers the request to a receiver side adjacent node, sequentially returns a resource assurance notice to the preceding node, and when the path setting request reaches the receiver side node, the receiver side node transmits a path setting end notice to the sender side node. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information communication network system, and more particularly to GMPLS (Generalized Mul).
ti Protocol Label Switching) network.

[0002]

2. Description of the Related Art The next-generation network will switch from photonic cross connect (PXC), which switches optical signals to electrical signals without converting them to electrical signals, to IP (Internet Protocol).
l) Composed of nodes in various layers up to the router that forwards the packet.

Such different Switching C
IETF (Internet Engineering Task Force) is standardizing a GMPLS control plane to which a framework of MPLS (Multi Protocol Label Switching) is applied in order to uniformly control nodes having availability.

In the path setting of the network, messages for establishing and maintaining the path are exchanged via the control channel, but in GMPLS, the control channel does not always physically match the data bearing link.

A path setting method in a conventional GMPLS network will be described with reference to FIG. FIG. 5 is a diagram showing a conventional path setting procedure. When setting a path from the originating node A to the destination node E, the originating node A sends a path setting request to the destination node E.
The path setting request is sequentially transferred to the nodes B, C and D on the route and reaches the destination node E. After that,
The destination node E sends a resource securing request to the originating node A. The resource reservation request is sequentially transferred on the nodes D, C, and B on the route in the reverse order of the path setting request, and reaches the originating node A.

The originating node is the node that sends the path setting request, and the destination node is the node that is the destination of the path setting request. Further, the path may be a unidirectional path or a bidirectional path. In the case of a bidirectional path, any node can be a data source or a data receiver in data transfer after the path is set between the source node and the destination node.

[0007]

In such a conventional path setting, after the path setting request arrives from the calling side node to the called side node, a resource securing request is first sent from the called side node to the calling side node. Is sent. That is, upon receiving the path setting request from the originating node, the nodes on the route recognize in advance the resources to be secured in preparation for the arrival of the resource securing request from the destination node. For example, the route through which the path setting request has arrived and the route through which the path setting request has been transferred are stored, and when a resource securing request arrives later, the resources of the route are secured.

[0008] As described above, in order to secure resources on the route, it is necessary to wait for a round trip of the message from end to end of the path, so it takes time to set the path.

The present invention has been made against such a background, and provides a network, a node, a program, a recording medium, and a path setting method that reduce the waiting time of a node and enable quick path setting. With the goal.

[0010]

In order to achieve the above object, in response to a path setting request from a calling side node, a node on a route transfers it to an incoming side adjacent node and When the path setting request reaches the destination node, the resource securing notification is returned, and a path setting completion notification is sent to the originating node.

In response to a path setting request from the originating node, the nodes on the route return resource allocation notifications in sequence, so that transfer of the path setting request and resource allocation for the own node can proceed simultaneously. The path can be set quickly. This reduces the waiting time of the node and enables quick path setting.

That is, a first aspect of the present invention includes a source node, a destination node, and a node installed on a path between the source node and the destination node. It is a network.

Here, a feature of the present invention is that the source node is provided with means for transmitting a path setting request for securing resources on the route toward the destination node. , A means for reserving a resource related to its own node on the basis of the path setting request, and a path setting request directed to the receiving side adjacent node when the resource is successfully secured by the securing means. And a means for transmitting a resource reservation notification to the adjacent node on the originating side, and for the destination node, means for reserving a resource related to the own node based on the path setting request,
When the resource securing is succeeded by the securing means, a resource securing notification is sent to the originating adjacent node and a path setting completion notification is sent to the originating node.

A second aspect of the present invention is that the source node and
A node applied to a network including a destination node and a node installed on a path between the source node and the destination node.

Here, a feature of the present invention is that, as the originating node, means for sending a path setting request for securing resources on the path to the destination node is provided, As a node installed on the path, means for reserving the resource for the own node based on the path setting request, and relaying the path setting request to the adjacent node on the receiving side when the reserving means succeeds in reserving the resource. And a means for sending a resource reservation notice to the adjacent node on the originating side, as the destination node, a means for reserving a resource related to the own node based on the path setting request, and a resource by the securing means. When the resource allocation is successful, the resource allocation notification is sent to the adjacent node on the originating side and the resource allocation notification is sent. There the setting completion notification to the place and means for sending towards the node of the calling side.

According to a third aspect of the present invention, when installed in an information processing device, the information processing device has a source node, a destination node, the source node and the destination node. It is a program that realizes a function corresponding to a node applied to a network including a node installed on a path between and.

Here, the feature of the present invention is that, as a function corresponding to the originating node, a path setting request for securing resources on the route is sent to the terminating node. The function is realized, and as a function corresponding to the node installed in the path, a function of securing a resource for the own node based on the path setting request is realized, and the path setting is performed when the resource securing is successful by the securing function. Realize the function of relaying the request to the destination adjacent node and sending the resource reservation notification to the source adjacent node,
As a function corresponding to the destination node, a function to secure a resource related to the own node based on the path setting request, and when the resource securing is successful by the securing function, a resource securing notification is directed to the originating adjacent node. The function of transmitting the path setting completion notification to the originating node is also realized.

A fourth aspect of the present invention is a recording medium readable by the information processing device, in which the program of the present invention is recorded. By recording the program of the present invention on the recording medium of the present invention, the information processing apparatus can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed in the information processing apparatus directly from a server holding the program of the present invention via a network.

As a result, by using an information processing device such as a computer device, it is possible to realize a network and a node in which the waiting time of a node is reduced and a quick path can be set.

A fifth aspect of the present invention is to provide a source node and
A path setting method applied to a network including a destination node and a node installed on a route between the source node and the destination node.

Here, a feature of the present invention is that the node on the originating side sends a path setting request for securing resources on the route to the node on the destination side, and sends the path setting request to the node on the destination side. The installed node attempts to secure resources for its own node based on the path setting request, and when the resource securing is successful as a result, relays the path setting request to the destination adjacent node and issues a resource securing notification. Of the destination node, the destination node tries to secure the resource for the own node based on the path setting request, and when the resource is successfully secured as a result, the resource securing notification is directed to the originating neighboring node. At the same time as sending, a path setting completion notification is sent to the originating node.

[0022]

DETAILED DESCRIPTION OF THE INVENTION A network according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the path setting procedure of this embodiment. FIG. 2 is a block diagram of a main part of a node on the calling side of this embodiment. FIG. 3 is a block diagram of the nodes on the route of this embodiment. FIG. 4 is a block diagram of the essential parts of the destination node of this embodiment.

In this embodiment, as shown in FIG. 1, a node A on the originating side, a node E on the destination side, and a node installed on the route between the node A on the originating side and the node E on the destination side. A network including B to D.

Here, the feature of this embodiment is that
As shown in FIG. 2, the path setting request sending unit 1 sends a path setting request for securing resources on the path to the node A on the calling side toward the node E on the called side.
3, each of the nodes B to D installed on the path secures a resource by the resource securing unit 2 that secures a resource related to its own node based on the path setting request, as shown in FIG. When successful, the request relay unit 3 that relays the path setting request to the receiving-side adjacent node and sends the resource securing notification to the calling-side adjacent node, and the receiving-side node E As shown in FIG. 4, a resource securing unit 2 that secures a resource related to its own node based on the path setting request, and when the resource securing unit 2 succeeds in securing the resource, sends a resource securing notification to the adjacent node on the originating side. In addition, a completion notification unit 4 that sends a path setting completion notification to the originating node A is provided.

In the present embodiment, for convenience of explanation, the originating side node A, the terminating side node E, and the nodes B to D on the route are explained as different block configurations, but in reality, each node is self-contained. Has a common block configuration capable of performing the respective functions of the originating node A, the destination node E, and the nodes B to D on the route according to the situation in which the node is placed.

The node of this embodiment can be realized by using a computer device which is an information processing device. That is, by installing in a computer device, a node installed on the computer device on the path between the originating node A, the destination node E, and the originating node A and the destination node E. A program that realizes a function corresponding to a node applied to a network including B to D, and as a function corresponding to a node A on the calling side,
A function corresponding to the path setting request sending unit 1 that sends a path setting request for securing resources on the path to the destination node E is realized, and a function corresponding to the nodes B to D installed on the path is realized. As a function for realizing the path setting request, a function corresponding to the resource securing unit 2 that secures a resource related to the own node is realized based on the path setting request, and when the resource securing is successful by the function corresponding to the resource securing unit 2, the path setting request is issued. The request relay unit 3 that relays to the destination adjacent node and sends the resource reservation notification to the source adjacent node.
And a function corresponding to the destination node E, which corresponds to the resource securing unit 2 that secures a resource related to the own node based on the path setting request, and a function corresponding to the resource securing unit 2. When a resource is successfully secured by the function, a program for realizing a function of sending a resource securing notification to an adjacent node on the sending side and sending a path setting completion notification to the node A on the sending side is installed in a computer device. According to the node A of this embodiment.
It can be a device corresponding to ~ E.

By recording the program of this embodiment on the recording medium of this embodiment, the computer device can install the program of this embodiment using this recording medium. Alternatively, the program of this embodiment can be directly installed in a computer device from a server holding the program of this embodiment via a network.

Thus, using the computer device,
It is possible to realize a network and a node in which the waiting time of the node is reduced and the path can be set quickly.

The embodiments of the present invention will be described in more detail below.

An embodiment of a network path setting method according to the present invention will be described with reference to FIG. Node A
The path setting request from the node is first sent to the node B on the route. The node B secures the resource regarding the own node, returns the resource securing notification to the node A, and transfers the path setting request to the node C. Similarly, the node C and the node D also transmit the resource reservation notification and transfer the path setting request. When the path setting request reaches the node E, it means that the resources on the route are successfully reserved, and thus the node E is the node A.
Send a path setting completion notification to. This path setting completion notification may be sent using any prompt means such as being sent directly without passing through a node on the route. Node A
Upon receiving the path setting completion notification, the user can know that the path setting is completed and can start using the path.

In this way, the method of sequentially establishing a path for each section can monitor the quality of the optical signal on the path in parallel with the path setting, with respect to the deterioration due to the propagation distance of the optical signal. It is effective when reproducing an optical signal on the route.

If the resource reservation fails during the path setting, the node notifies another node of the error and releases the already reserved resource.

[0033]

As described above, according to the present invention,
The waiting time of the node is reduced, and quick path setting is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a path setting procedure of this embodiment.

FIG. 2 is a block diagram of a main part of a node on the calling side according to this embodiment.

FIG. 3 is a block diagram of a main part of a node on a route according to this embodiment.

FIG. 4 is a block diagram of a main part of a destination node according to the present embodiment.

FIG. 5 is a diagram showing a conventional path setting procedure.

[Explanation of symbols]

1-path setting request transmission part 2 Resource securing department 3 Request relay unit 4 Completion notification section A to E nodes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naoaki Yamanaka             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Ya Imajuku             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5K030 GA01 HA08 HC01 HD03 LB05                       LC09 MA04 MB16                 5K033 AA02 CB06 CC01 DB16 DB18

Claims (5)

[Claims] 1. A network including a calling-side node, a called-side node, and a node installed on a route between the calling-side node and the called-side node, wherein: Comprises means for sending a path setting request for securing resources on the route toward the destination node, and the node installed on the route includes a resource related to its own node based on the path setting request. And a means for relaying the path setting request to the receiving-side adjacent node and sending a resource-securing notification to the calling-side adjacent node when the resources are successfully secured by the securing means. The destination node includes means for reserving resources related to the own node based on the path setting request, and means for reserving the resources. Network, characterized in that a means for sending towards the path setting completion notification sends out towards the resource reservation notification to the calling side neighboring node to the node of the calling side when a successful source secured. 2. A node applied to a network including a source node, a destination node, and a node installed on a path between the source node and the destination node, wherein: The source node includes means for transmitting a path setting request for securing resources on the route to the destination node, and the node installed on the route is based on the path setting request. A means for reserving a resource related to a node, and when the resource reserving by the reserving means is successful, the path setting request is relayed to the destination adjacent node and the resource reservation notification is transmitted to the originating adjacent node. Means, as the destination node, means for reserving resources related to its own node based on the path setting request, When the resource securing is succeeded by the securing means, a resource securing notification is sent to an adjacent node on the originating side and a path setting completion notification is sent to the originating node. The node to do. 3. When installed in an information processing device, the information processing device is installed in a source node, a destination node, and a path between the source node and the destination node. In a program that realizes a function corresponding to a node applied to a network including a specified node, a path setting request for securing resources on the path is set as a function corresponding to the node on the calling side. The function to send to the node of the node is realized, and the function to secure the resource related to the own node based on the path setting request is realized as a function corresponding to the node installed in the path, and the resource is secured by the function to secure. If it succeeds, the path setting request is relayed to the destination adjacent node and the resource securing notification is issued. As a function corresponding to the destination node, the function of transmitting to the adjacent node is realized, and the function of securing the resource related to the own node based on the path setting request and the resource securing by the securing function are successful. A program that realizes a function of sending a resource reservation notification to an adjacent node on the calling side and sending a path setting completion notification to the node on the calling side. 4. A recording medium readable by the information processing device, in which the program according to claim 3 is recorded. 5. A path setting method applied to a network including a source node, a destination node, and a node installed on a path between the source node and the destination node. , The originating node sends out a path setting request for securing resources on the route to the destination node, and the node installed on the route, based on the path setting request, its own node When the resource reservation is succeeded as a result, the path setting request is relayed to the destination adjacent node and the resource reservation notification is sent to the source adjacent node, and the destination node Then, based on the path setting request, an attempt is made to secure resources for the own node. Is sent to an adjacent node on the calling side, and a path setting completion notification is sent to the node on the calling side.