JP2003318970A - Network, node, and path setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform path setting even when a data channel and a control channel belong to separate networks. <P>SOLUTION: Information for designating a path is included in a resource assurance request from a receiver side node and even when a path setting request is directly transmitted to the receiver side node, nodes on a path specify a resource to be assured by them on the basis of the information designating the path included in the resource assurance request, and since the resource assurance request is transferred by each hop on the path passing nodes up to the sender node, the path can be set. <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 the GMPLS network will be described with reference to FIG. FIG. 8 is a diagram showing a conventional path setting procedure. When setting a path from the originating node A to the terminating node D, the originating node A
Sends a path setting request to the destination node D. The path setting request is sequentially transferred to the nodes B and C on the route, and reaches the destination node D. Thereafter, the destination node D sends a resource securing request to the originating node A. The resource securing request is sequentially transferred on the nodes C and B on the route in the reverse order of the path setting request, and reaches the originating node A.

At this time, when the nodes B and C on the route receive the path setting request from the originating node A,
The resources to be secured are recognized in advance in case a resource securing request from the destination node D arrives. 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.

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 transmission source or a data reception destination in the data transfer after the path is set between the source node and the destination node.

[0008]

In such a conventional path setting procedure, when setting a path from the originating node A to the terminating node D, the path setting request passes through the path. It needs to be forwarded on a hop-by-hop basis on nodes B and C. If it is not forwarded by hop,
In nodes B and C, even if a resource securing request arrives later, the resource to be secured requested by the resource securing request becomes unknown, and resource securing becomes difficult.

However, if the data channel and the control channel are configured in different networks as in the network configuration shown in FIG. 8, the path setting request is directly sent to the destination node, and the path setting is not performed. There is a problem that becomes difficult.

The present invention has been made against such a background, and a network, a node, a program and a recording medium capable of normally performing path setting even if the data channel and the control channel are different networks. And to provide a path setting method.

[0011]

According to the present invention, even if a path setting request is sent directly to a destination node by including information designating a route in a resource securing request from the destination node, The node on the route can identify the resource to be secured by itself, based on the information specifying the route included in the resource securing request,
Since the resource securing request is transferred to the originating node on the node passing through the path for each hop, the path can be set.

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. A network, wherein the feature of the present invention is that the source node includes means for transmitting a path setting request for securing resources on the route toward the destination node, The destination node includes means for securing resources related to the own node based on the path setting request and sending a resource securing request toward the node installed in the path, and the resource securing request includes the The node including the information specifying the route is included in the resource securing request even if the node installed in the route does not receive the path setting request. There the resource securing request while securing resources for its own node based on the information specifying the serial path at having means for relaying toward node of the calling side.

A second aspect of the present invention is that the source node is
It is applied to a network including a destination node and a node installed on a route between the source node and the destination node, and secures resources on the route as the source node. Means for sending a path setting request to the destination node to secure a resource related to its own node based on the path setting request as the destination node, and a resource securing request is installed in the path. The resource reservation request includes information for designating the route, and the resource reservation request is performed as a node installed on the route even if the path setting request is not received. The resource related to the own node is secured based on the information specifying the route included in Scan is a node, characterized in that the reservation-requested comprising means for relaying toward 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. A path setting for securing resources on the path as a function corresponding to a node applied to a network including a node installed in a path between the path and a path corresponding to the originating node. A function for transmitting a request to the destination node is realized, and as a function corresponding to the destination node, a resource for the own node is secured based on the path setting request and a resource securing request is installed on the route. The function for sending out to the specified node, the resource reservation request includes information for specifying the route,
As a function corresponding to the node installed on the route, even if the path setting request is not received, the resource securing request is secured while the resource related to the own node is secured based on the information specifying the route included in the resource securing request. Is a program that realizes a function of relaying to the node on the originating side.

A fourth aspect of the present invention is to provide a source node and
It is applied to a network including a destination node and a node installed on a route between the source node and the destination node, and the source node secures resources on the route. A path setting request for sending to the destination node, the receiving node secures resources for its own node based on the path setting request and directs the resource securing request to the node installed in the route. The resource securing request includes information for designating the route, and the node installed in the route designates the route included in the resource securing request even if the node does not receive the path setting request. The resource securing request is secured based on the information and the resource securing request is issued to the originating node. A path setting method characterized by relaying toward.

The information designating the route includes:
It can include information that enumerates and specifies a node to be passed through and a label to be used.

Alternatively, the information designating the route can designate the route and also designate a route of an existing or new path included in the route. At this time, the information designating the route can designate the route and the route of the existing or new path included in the route by enumerating the nodes passing through and the label to be used. Alternatively, in the information designating the route, the route may be listed by designating the nodes passing through and the label to be used, and the route of the existing path included in the route may be designated by the path identifier.

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.

With this, it is possible to realize a network and a node that can perform path setting by using an information processing device such as a computer device even if the data channel and the control channel are different networks.

[0020]

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 essential parts 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. Figure 5
FIG. 4 is a diagram for explaining information designating a route of the first embodiment. FIG. 6 is a diagram for explaining the information designating the route of the second embodiment. FIG. 7 is a diagram for explaining the information designating the route of the third embodiment.

In the present embodiment, as shown in FIG. 1, a node A on the originating side, a node D on the destination side, and a node installed on the route between the node A on the originating side and the node D on the destination side. A network including B and C, which is a feature of this embodiment, is that a node A on the originating side receives a path setting request for securing resources on the route as shown in FIG. The destination-side node D is provided with a path setting request transmission unit 1, and the destination-side node D is provided with a path setting request transmission unit 1 as shown in FIG.
The resource securing unit 2 and the request sending unit 3 which secure resources for the own node based on the path setting request and transmit the resource securing request to the nodes B, C, and A installed on the path are provided. The request includes information designating the route, and the nodes B and C installed on the route have the information shown in FIG.
As shown in FIG. 3, even if the path setting request is not received, the resource relating to the own node is secured based on the information specifying the route included in the resource securing request, and the resource securing request is directed to the originating node A. It is provided with a resource securing unit 12 and a request relaying unit 13 for relaying the request.

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 D, and the originating node A and the destination node D. As a function corresponding to the nodes A to D applied to the network including B and C, and corresponding to the node A on the originating side, a path setting request for securing resources on the path is set on the destination side. Of the path setting request sending unit 1 which sends the path setting request sending unit 1 to the node D of the destination node D, and as a function corresponding to the destination node D, secures resources related to the own node based on the path setting request and secures the resource securing request. To realize the functions corresponding to the resource securing unit 2 and the request sending unit 3 that send the data to the nodes B, C, and A installed on the path. The resource reservation request includes information for designating the route, and is included in the resource reservation request even if the path setting request is not received as a function corresponding to the nodes B and C installed in the route. A program that secures resources related to its own node based on the information that specifies the route to be executed and realizes a function corresponding to the resource securing unit 12 and the request relay unit 13 that relays the resource securing request toward the originating node A. By installing the computer device in the computer device, the computer device can be a device corresponding to the nodes A to D of the present embodiment.

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 that can perform path setting even if the data channel and the control channel are separate networks.

Next, an embodiment of a network path setting method according to the present invention will be described. As shown in FIG. 1, the path setting request from the node A is directly sent to the node D via the control channel. The node D sends a resource reservation request to the node A, and enumerates the nodes passing through as nodes C, B, and A and specifies the nodes. Since the nodes B and C on the route transfer the message according to this designation, the path can be set.

(First Embodiment) A first embodiment will be described with reference to FIG. In the first embodiment, the information for designating the route includes information for designating the route by enumerating the nodes C, B, A passing through and the label # 1 to be used.

First, in the node D, there is no search for an existing route to the node C based on the information that the passing node included in the resource securing request is the node C and the label is # 1, so a route is newly established. And set this as the path of label # 1. That is, in the node D, a new path from the nodes D to C is set, and this is set as the path of label # 1.

Next, in the node C, there is no search for an existing route to the node B based on the information that the passing node included in the resource reservation request is the node B and the label is # 1, so the route is set to the route. It is newly established and this is the path with label # 1. That is, in the node C, a new path leading to the node B is set, and this is set as the path of label # 1.

Next, in the node B, there is no search for an existing route to the node A based on the information that the node passing through included in the resource reservation request is the node A and the label is # 1, so the route is set to the route. It is newly established and this is the path with label # 1. That is, in the node B, a new path to the node A is set, and this is set as the path of label # 1.

As a result, the path of label # 1 from nodes A to D is set. In the path with the label # 1, the packet with the label # 1 is immediately transferred to the node D without reading its IP address.

(Second Embodiment) A second embodiment will be described with reference to FIG. In the second embodiment, the information designating the route designates the route and also designates a route of an existing or new path included in the route. At this time,
The information for designating the route enumerates the route and the route of the existing or new path included in the route by listing the nodes C, H, G, B, A and the label # 1 to be used.

First, in the node D, since there is no search for an existing route to the node C based on the information that the transit node included in the resource securing request is the node C and the label is # 1, the route is newly established. And set this as the path of label # 1.

Next, in the node C, an existing route to the node H is searched based on the information that the transit node included in the resource reservation request is the node H and the label is # 1, and the lower layer node is searched. The path with the label # 1 is set to the existing route to the node H which is

Next, in the node H, an existing route to the node G is searched based on the information that the transit node included in the resource securing request is the node G and the label is # 1, and the same as its own node. The path with the label # 1 is set to the existing route to the node G which is a lower layer node.

Next, in the node G, an existing route to the node B is searched based on the information that the passing node included in the resource reservation request is the node B, and the label is # 1, The path with the label # 1 is set to the existing route to the node B, which is a higher layer node.

Next, in the node B, there is no search for the existing route to the node A based on the information that the transit node included in the resource securing request is the node A and the label is # 1, so A route to A is newly established and this is designated as a path with label # 1.

In the second embodiment, since the existing path can be used as the path between the nodes B and C, it is possible to effectively use the network resource.

(Third Embodiment) A third embodiment will be described with reference to FIG. In the third embodiment, the information designating the route designates the route and also designates a route of an existing or new path included in the route. At this time,
The information designating the route enumerates and designates the nodes C and A passing through the route and the label # 1 to be used, and designates the route of the existing path included in the route as the path identifiers #hc, #h. , #Bg.

First, in the node D, since there is no search for an existing route to the node C based on the information that the transit node included in the resource securing request is the node C and the label is # 1, the node C does not have to search. A route up to is newly established, and this is designated as the path of label # 1.

Next, in the node C, based on the information that the path identifier of the route included in the resource securing request is #hc and the label is # 1, it is confirmed that the route to the node H is already established. It is determined and the path with label # 1 is set in the existing route to the node H, which is a lower layer node. That is, the existence of the existing route can be recognized from the existence of the path identifier.

Next, in the node H, based on the information that the path identifier of the route included in the resource securing request is #h and the label is # 1, the node G
It is determined that the route up to is existing, and the path with the label # 1 is set to the existing route up to the node G which is a lower layer node like the own node.

Next, in the node G, based on the information that the path identifier of the route included in the resource securing request is #bg and the label is # 1, it is confirmed that the route to the node B is already established. It is determined and the path with label # 1 is set on the existing route to the node B, which is a node on the upper layer than the own node.

Next, in the node B, there is no search for the existing route to the node A based on the information that the transit node included in the resource reservation request is the node A and the label is # 1, so the node A route to A is newly established and this is designated as a path with label # 1.

In the third embodiment, as in the second embodiment, the existing path can be used as the path between the nodes B and C.
Effective use of network resources can be achieved.

(Summary of Examples) As described above, as the information for designating the route included in the path setting request, the label used for the path can be listed and designated together with the node. Further, although the case where one label # 1 is designated has been described in the present embodiment, a plurality of labels # 1 to # 1 are designated.
#N can also be specified. If there are multiple labels specified in this way, the node A that receives the request
Can select a label to use from multiple labels. Furthermore, when no label is specified, the node receiving the request can freely select the label.

When the paths extend over a plurality of layers, it is possible to enumerate the nodes passing through those lower layer paths and specify the routes, or, instead of enumerating the nodes, assign them to the lower layer paths. It is also possible to specify a route using the assigned path identifier.

Even when the path setting request is transferred on a hop-by-hop basis not on the control channel but on the data channel, by collecting the routing information in the resource reservation request, the path setting request is collected in the process of being transferred. Efficient path setting can be performed by reflecting the created resource information in the resource securing request.

[0048]

As described above, according to the present invention,
The path can be set even if the data channel and the control channel are separate networks.

[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 for explaining information designating a route according to the first embodiment.

FIG. 6 is a diagram for explaining information designating a route according to the second embodiment.

FIG. 7 is a diagram for explaining information designating a route according to the third embodiment.

FIG. 8 is a diagram showing a conventional path setting procedure.

[Explanation of symbols]

1-path setting request transmission part 2, 12 Resource securing section 3 Request sending part 13 Request relay unit A to J nodes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kohei Shiomoto             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                 5K034 AA17 DD01 EE09 FF06 FF08                       FF11 LL01

Claims (9)

[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 transmitting a path setting request for securing resources on the route to the destination node, and the destination node securing resources relating to its own node based on the path setting request. And a means for sending a resource reservation request to the node installed on the path, the resource reservation request includes information for specifying the path, the node installed on the path, the Even if the path setting request has not been received, it is possible to relate to the own node based on the information specifying the route included in the resource securing request. Network, characterized in that said resource reservation request comprises means for relaying toward node of the calling side while securing the source. 2. The present invention is 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 node includes means for transmitting a path setting request for securing resources on the route to the destination node, and the destination node secures resources related to its own node based on the path setting request. And a means for transmitting a resource reservation request to a node installed on the path, the resource reservation request includes information designating the path, and the path setting is performed as a node installed on the path. Even if the request is not received, the resource related to the own node is re-established based on the information specifying the route included in the resource securing request. Node, characterized in that it comprises means for relaying toward node of the calling side the resource securing request while securing the over scan. 3. When the information processing device is installed, the information processing device is installed in a source node, a destination node, and a path between the source node and the destination node. A node corresponding to the destination node, which is a function corresponding to the node applied to the network including the specified node, and which is a function corresponding to the node on the originating side. As a function corresponding to the destination node, and secures resources for the own node based on the path setting request, and transmits a resource securing request to the node installed on the route. The resource reservation request includes information designating the route, and corresponds to the node installed in the route. As a function, even if the path setting request is not received, the resource relating to the own node is secured based on the information specifying the route included in the resource securing request, and the resource securing request is relayed to the originating node. A program that realizes the function to perform. 4. The present invention is 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 node sends a path setting request for securing the resource on the route to the destination node, and the destination node secures a resource related to its own node based on the path setting request and a resource securing request. To the node installed on the path, the resource reservation request includes information designating the path, the node installed on the path, even if it has not received the path setting request The resource related to the own node is secured based on the information specifying the route included in the resource securing request, and the resource is secured. Path setting method characterized by relaying toward the coercive request to the node of the calling side. 5. The network according to claim 1, wherein the information for designating the route includes information for designating the route by enumerating nodes passing through and labels used. 6. The network according to claim 1, wherein the information designating the route designates the route and also designates a route of an existing or new path included in the route. 7. The information designating the route, according to claim 1 or 6, wherein the route and the route of an existing or new path included in the route are designated by enumerating nodes to be passed and labels to be used. network. 8. The information for designating the route specifies the route by enumerating the nodes passing through and the label to be used, and designating the route of the existing path included in the route by a path identifier. The network according to 1 or 6. 9. A recording medium readable by the information processing device, in which the program according to claim 3 is recorded.