JP2003179631A - Data transmission system and method, information processing device and method, recording medium and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly transfer data. <P>SOLUTION: MPLS networks 71-1, 71-2 and 71-3 are successively connected. A data transmitter-receiver 121 has a local label path inside each network set to LERs 111-2 and 111-3 as entrance routers of the respective networks. Labels of the LERs 111-2 and 111-3 are reported to the data transmitter-receiver 121 as the entrance labels of the respective networks. For the LERs 112-1 and 112-2 as exit routers of the networks, by storing the labels of the LERs 111-2 and 111-3 as the entrance routers of the networks of a post stage, a global label path is set. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system and method, an information processing apparatus and method, a recording medium, and a program, and particularly to transmitting data quickly and easily via a plurality of networks. The present invention relates to a data transmission system and method, an information processing apparatus and method, a recording medium, and a program that enable the above.

[0002]

2. Description of the Related Art Recently, networks typified by the Internet have become widespread, and various types of data have been transferred via various types of networks. As one of such networks, a network using multi-protocol label switching has attracted attention. This Multi-Protocol Label Switching (MPLS) is based on IETF (Internet Engineering Ta
sk Force) RFC (Request For Comments)
3031.

IP used in the Internet
(Internet Protocol) When a packet moves through a network, the router analyzes the IP header to determine the next hop. That is, when the packet moves through the network, each IP router uniquely analyzes the layer 3 (network layer) address to determine the next hop destination. The process of determining the next hop destination is performed in two stages.

In the first stage, packets are classified into a Forward Equivalence Class (FEC). That is, routing is performed.

As a second step, each FEC is mapped to the next hop. That is, forwarding is performed.

As described above, in the conventional IP network,
Each time an IP router transfers a packet, it assigns a FEC to its destination address. That is, the processing of the first step and the second step is performed every time a packet is transferred.

On the other hand, in a network using MPLS, for example, the network 1 is composed of a plurality of routers as shown in FIG. A router located at an end point of the MPLS network 1 and serving as a connection point with another network is a label edge router (LER), and the other routers are label switching routers (LSRs). In the example of FIG. 1, the data transmission / reception device 1
1 is connected to LER21 and data transmission / reception device 12 is connected to LER2
2 is connected. Also, LER21 and LER22 are LSR
They are connected to each other by 31 to 34.

In such a network 1 based on MPLS, the process of assigning a specific FEC to a specific packet is performed only once by the LER arranged at the entrance when transferring the packet. For example, when a packet is transferred from the data transmission / reception device 11 to the data transmission / reception device 12, it is performed only once by the LER 21.

The FEC assigned to the packet is encoded into a short fixed-length value called a label, and is transferred to the next hop together with the packet.

At the subsequent hops, that is, LSR3
1 to LSR 34, the packet is layer 3
No address parsing is done. That is, the above-described first stage processing is not performed. Instead, in the network 1 using MPLS, the label is used as a table index value to determine the next hop and the new label. At the router, the old label is replaced with the new label and the packet is forwarded to the next hop.

The route of a packet classified into a specific FEC is called a label switch path (LSP).

The LSP starts with the LER at the entrance and starts with many LSRs.
Exit at the exit LER via.

To create an LSP, label distribution and resource reservation on the route are required. The LSP can be manually created by setting the label mapping of each note, or can be automatically created using the Label Distribution Protocol (LDP) defined in RFC3036.

[0014]

By the way, a non-MPLS network such as an existing IP network, for example, as shown in FIG. 2, is connected to the entrance / exit of a network using MPLS currently in operation. Often. In the example of FIG. 2, the IP network 51 is connected to the network 1 using MPLS via the LER 21.
Are connected, and the IP network 52 is connected via the LER 22.

In the IP network 51, the data transmitting / receiving device 11 and the data transmitting / receiving device 13 are connected to the IP router 41, and the IP router 41 is connected to the LER 21. In the IP network 52, the data transmitter / receiver 12 is connected to the IP router 42, and the IP router 42 is connected to the LER2.
Connected to 2.

In such a network system, for example, when an IP packet is transmitted from the data transmission / reception device 11 to the data transmission / reception device 12, a label is added to the IP packet transmitted from the IP network 51 in the network 1. It is transmitted within the network 1. Since this label is unnecessary in the IP network, it is deleted in the IP network 52.

FIG. 3 shows a configuration example of a packet (IP-MPLS packet) transferred in the network system 1 of FIG. As shown in the figure, a Layer 2 MAC (Media Access Control) header is placed at the beginning of the header, and then a label (Label) is placed. The IP address is placed next to the label, and then UDP / TC.
A P-header is placed, followed by a data bay load.

UDP (User Datagram Protocol) is TCP / IP
It is a transport layer protocol in the protocol, and performs best-effort datagram-oriented communication between processes (applications) on two nodes. TCP (Transmission Control Protocol) is a transport layer protocol in TCP / IP, and performs reliable session-oriented communication between processes (applications) on two nodes.

In the network 1 using such MPLS, after the LSP is set, the label transfer is performed without performing the layer 3 header analysis, so that the load is reduced. On the other hand, it is located at the entrance of the network 1.
LER21 and 22 analyze each input packet every time, and
You must assign an EC and add a label. For this reason, the load becomes large, the configuration of the LSR becomes complicated, and high-speed processing is required, resulting in an inevitable expensive device.

Further, when considering the speeding up and opticalizing of the network using MPLS, the LSRs 32 to 34 only perform the forwarding work corresponding to the second stage of the above two stages, so that the speedup is easy. it is conceivable that. On the other hand, LEs located at the gateway of the network
R21 and 22 need to analyze the layer 3 packet header (IP packet) for each packet and allocate the FEC and label, which makes speedup difficult, and considering network performance, a bottleneck for speedup. It is expected to become a neck.

The present invention has been made in view of such circumstances, and makes it possible to configure a network with an inexpensive device (router) and to quickly transfer data. To do.

[0022]

In a data transmission system according to the present invention, a first data transmitting / receiving device requests each device located at the entrance of a plurality of networks to set a route in the network to which the device belongs. However, each of the devices located at the entrances of the plurality of networks sets the route in the network to which the device belongs based on the request from the first data transmission / reception device, and sets the first label according to the internal route. The first data transmitting / receiving apparatus transmits the packet containing the notified label and data to the second data transmitting / receiving apparatus via the network.

The first data transmission / reception device can sequentially arrange, in the packet, a label corresponding to each internal route notified from a device located at the entrance of a plurality of networks from the downstream side of the route.

The first data transmitting / receiving device can acquire the label by using the border gateway protocol.

In the data transmission method of the present invention, the first data transmission / reception device requests each device located at the entrance of the plurality of networks to set the route in the network to which the device belongs, Each of the devices located at the entrance sets the route in the network to which the device belongs based on the request from the first data transmitting / receiving device and notifies the first data transmitting / receiving device of the label according to the internal route. The first data transmitting / receiving device is characterized by transmitting the packet including the notified label and data to the second data transmitting / receiving device via the network.

The first information processing apparatus of the present invention includes a requesting means for requesting each device located at the entrance of a plurality of networks to set a route in the network to which the device belongs, Acquiring means for acquiring a label corresponding to each internal route notified from the device located and a packet including the label and data acquired by the acquiring means are transmitted to another information processing device via a plurality of networks. And a transmission means.

[0027] The transmission means can sequentially arrange, in the packet, a label corresponding to each internal route notified from a device located at the entrance of a plurality of networks from the downstream side of the route.

The plurality of networks are networks based on multi-protocol label switching, and the requesting means can execute the request based on the label distribution protocol.

The acquisition means can acquire the label using the border gateway protocol.

The first information processing method according to the present invention comprises: a request step for requesting each device located at the entrance of a plurality of networks to set a route in the network to which the device belongs; An acquisition step of acquiring a label corresponding to each internal route notified from the device located, and a packet including the label and the data acquired by the process of the acquisition step to another information processing device via a plurality of networks. And a transmission step of transmitting.

The program of the first recording medium of the present invention is
A program for an information processing device that transmits data to another information processing device via a plurality of networks, requesting each device located at the entrance of a plurality of networks to set a route in the network to which the device belongs Requesting step, an acquiring step of acquiring a label corresponding to each internal route notified from a device located at the entrance of a plurality of networks, and a plurality of packets including the label and data acquired by the processing of the acquiring step. And a transmission step of transmitting the information to another information processing apparatus via the network.

The first program of the present invention is for a computer controlling an information processing device for transmitting data to another information processing device via a plurality of networks, for each device located at the entrance of a plurality of networks. , A request step for requesting the setting of a path in the network to which the device belongs, an acquisition step for acquiring a label corresponding to each internal path notified from the devices located at the entrances of the plurality of networks, and a process of the acquisition step And a transmitting step of transmitting the packet including the acquired label and data to another information processing apparatus via a plurality of networks.

According to another aspect of the present invention, there is provided a second information processing apparatus which receives from the first data transmitting / receiving apparatus a request for setting a path for data transmission in a network, and a first means received by the receiving means. The setting means for setting the route in the network based on the request from the data transmitting / receiving device, the notifying means for notifying the label according to the internal route to the first data transmitting / receiving device, and the first data transmitting / receiving device have transmitted. And a transfer means for transferring the packet including the label and the data notified by the notification means to the second data transmitting / receiving device via the network.

The network may be a multiprotocol label switching based network.

A second information processing method of the present invention comprises a receiving step of receiving a request for setting a path for data transmission in a network from the first data transmitting / receiving apparatus,
A setting step of setting a route in the network based on a request from the first data transmitting / receiving apparatus received by the processing of the receiving step; a notifying step of notifying the label of the information processing apparatus to the first data transmitting / receiving apparatus, The present invention is characterized by including a transfer step of transferring the packet including the label and the data notified by the notifying step, which has been transmitted by the first data transmitting / receiving apparatus, to the second data transmitting / receiving apparatus via the network.

The program of the second recording medium of the present invention is
A program of an information processing apparatus, which is located at the entrance of a network and transfers the data transmitted from the first data transmitting / receiving apparatus to the second data transmitting / receiving apparatus via the network, the program being transmitted from the first data transmitting / receiving apparatus to the network. A receiving step of receiving a request for setting a path for data transmission in the step of setting a path in the network based on the request from the first data transmitting / receiving device received by the processing of the receiving step; A notification step of notifying the label of the processing device to the first data transmission / reception device, and a packet transmitted by the first data transmission / reception device and including the label and the data notified by the notification step to the second data transmission device via the network. And a transfer step of transferring to the data transmitting and receiving device.

A second program of the present invention controls an information processing device which is located at the entrance of the network and which transfers the data transmitted from the first data transmitting / receiving device to the second data transmitting / receiving device via the network. A receiving step of receiving a request for setting a path for data transmission in the network from the first data transmitting / receiving device to the computer, and the first step received by the processing of the receiving step.
Setting step of setting a route in the network based on a request from the data transmitting / receiving apparatus, a notifying step of notifying the label of the information processing apparatus to the first data transmitting / receiving apparatus, and the first data transmitting / receiving apparatus transmitted. And a transfer step of transferring the packet including the label and the data notified by the notification step to the second data transmission / reception device via the network.

The third information processing apparatus of the present invention receives the request for setting the path for data transmission in the network transmitted from the first data transmitting / receiving apparatus, and the receiving means. Request transfer means for transferring a request from the first data transmitting / receiving device to another information processing device located at the entrance of the second network.

Further provided is a label transfer means for transferring the label information transmitted from another information processing apparatus located at the entrance of the second network to the first data transmitting / receiving apparatus via the first network. You can do that.

The first network and the second network may be networks based on multiprotocol label switching.

A third information processing method according to the present invention comprises a receiving step of receiving a request for setting a path for data transmission in a network, which is transmitted from the first data transmitting / receiving apparatus, and a receiving step. And a request transfer step of transferring the generated request from the first data transmission / reception device to another information processing device located at the entrance of the second network.

The program of the third recording medium of the present invention is
A program of an information processing device, which is located at an exit of a first network and transfers data transmitted from a first data transmitting / receiving device to a second data transmitting / receiving device via a second network in a subsequent stage, The receiving step of receiving a request for setting a route for data transmission in the network, which is transmitted from the first data transmitting / receiving apparatus, and the request from the first data transmitting / receiving apparatus received by the processing of the receiving step, Request transfer step of transferring to another information processing apparatus located at the entrance of the network.

A third program of the present invention is located at the exit of the first network, and transmits the data transmitted from the first data transmitting / receiving apparatus to the second data transmitting / receiving apparatus via the second network in the subsequent stage. To the computer which controls the information processing device to be transferred to the receiving step of receiving the request for setting the path for data transmission in the network, which is transmitted from the first data transmitting / receiving apparatus, and received by the processing of the receiving step. A request transfer step of transferring a request from the first data transmitting / receiving device to another information processing device located at the entrance of the second network.

In the data transmission system and method of the present invention, the first data transmission / reception device requests each device located at the entrance of the network to set the route in the network, and each of the devices transmits The route in the network is set based on the request, and the label according to the internal route is notified to the first data transceiver, and the first data transceiver transmits the packet including the label via the network. And transfers it to the second data transmitting / receiving device.

A first information processing apparatus and method of the present invention,
In the recording medium and the program, each device located at the entrance of a plurality of networks is requested to set a route in the network, and a packet including the label acquired from the device is transmitted to other devices via the network. Is transmitted to the information processing device.

A second information processing apparatus and method of the present invention,
In the recording medium and the program, the route in the network is set based on the request for setting the route from the first data transceiver, and the label according to the internal route is notified to the first data transceiver. It Then, the packet including the label transmitted by the first data transmission / reception device is transferred to the second data transmission / reception device via the network.

A third information processing apparatus and method of the present invention,
In the recording medium and the program, when the request for setting the route transmitted from the first data transmitting / receiving device is received, the request is transferred to another information processing device located at the entrance of the second network.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 4 shows a configuration example of a network system to which the present invention is applied. In the example of FIG. 4, the MPLS network 71-1 is replaced by the MPLS network 7
1-2 is connected, and further MP is added to MPLS network 71-2.
The LS network 71-3 is connected.

In the MPLS network 71-1, the data transmission / reception device 121 is connected to the LSRs 81-1 and 82-1 and the LER 112-1. LER112-1 is
It is connected to the LSRs 81-1 and 82-1 as well as to the LER 111-2 of the MPLS network 71-2.

In the MPLS network 71-2, LE
R111-2 to LSR81-2, 82-2, and LER11
2-2 are connected. For LER112-2, LSR81
-2, 82-2 are connected, and the LER 111-3 of the MPLS network 71-3 is connected. MPL
In the S network 71-3, the data transmission / reception device 123 uses the LSRs 81-3, 82-3 and the LER 111-3.
It is connected to the. LER111-3 also has LSR81-
3, 82-3 are also connected.

FIG. 5 shows a configuration example of the data transmission / reception device 121. Although not shown, the other data transmission / reception devices 123 have the same configuration.

In the example of FIG. 5, the data transmitter / receiver 1
21 has a path control unit 131, a data transfer unit 132, an extended label table 133, and a destination-exit router correspondence table 134.

The path control unit 131 for performing path control (LSP control) includes a local label path setting unit 141, a global label path setting unit 142, an entrance label setting unit 143,
And a BGP control unit 144. The local label setting unit 141 is, for example, a label distribution protocol (Label Distrib) described in RFC3036.
Set the local label path using the ution Protocol (LDP). The global label path setting unit 142 transmits / receives setting information of a label path (global label path) across a plurality of MPLS networks to / from another data transmitting / receiving device and an ingress router to perform setting.

The entrance label setting unit 143 requests and receives the entrance label value of the local label path of the MPLS network. The BGP control unit 144 uses a Border Gateway Protocol (BGP),
Alternatively, an alternative routing protocol is used to collect information about the ingress router and the egress router in each local label path. BGP is described in RFC1771.

The data transfer unit 132 should transfer the MPLS data transfer unit 161 that performs MPLS data transfer using MPLS described in RFC 3031 and the obtained ingress label value of the local label path of each MPLS network. RFC3032, which adds packets in a predetermined order and transfers them
The label stack unit 162 described in 1.

The extended label table 133 stores the correspondence between packet destinations and label values, the details of which will be described later with reference to FIG.

The destination-exit router correspondence table 134 stores the correspondence between the packet destinations and the exit routers when the packets are sent out. The details will be described later with reference to FIG.

The data transmitting / receiving apparatus of FIG. 5 basically represents the configuration of the data transmitting / receiving apparatus on the transmitting side, and the data transmitting / receiving apparatus on the receiving side has only a part of its functions. Good.

FIG. 6 shows a configuration example of the LER 111 as an entrance router arranged at the entrance of the network.

The LER 111 has a path control unit 201, a data transfer unit 202, a destination-exit router correspondence table 203, and a label table 204.

The path control unit 201 has a local label path setting unit 211, a global label path setting unit 212, an entrance label setting unit 213, and a BGP control unit 214. These are the local label path setting unit 1 included in the path control unit 131 in the data transmission / reception device 121 of FIG.
41, the global label path setting unit 142, the entrance label setting unit 143, and the BGP control unit 144 basically have the same functions.

The data transfer unit 202 has an MPLS data transfer unit 221. This MPLS data transfer unit 221 is also shown in FIG.
The MPLS data transfer unit 161 included in the data transfer unit 132 of the data transmission / reception device 121 has basically the same function.

The destination-exit router correspondence table 203 is a correspondence table similar to the destination-exit router correspondence table 134 in the data transmitting / receiving apparatus 121 of FIG.

The label table 204 stores the correspondence between ports and labels, and is referred to when transferring MPLS data within the MPLS network as in the conventional case.

FIG. 7 shows a configuration example of the LER 112 as an exit router arranged at the exit of the network.

The LER 112 has a path control unit 301, a data transfer unit 302, a destination-next network entrance router correspondence table 303, a label-port correspondence table 304, and a label table 305.

The path control unit 301 has a local label path setting unit 311, a global label path setting unit 312, and a BGP control unit 313. These have a function corresponding to the local label path setting unit 211, the global label setting unit 212, and the BGP control unit 214 in the path control unit 201 of the LER 111 as the ingress router of FIG.

The data transfer section 302 has an MPLS data transfer section 321. This MPLS data transfer unit 321 is shown in FIG.
The data transfer unit 202 of the LER 111 has the same function as the MPLS data transfer unit 211.

Destination-Next Network Ingress Router Correspondence Table 3
03 stores the correspondence between the packet destination and the next network ingress router, the details of which are shown in FIG.
Will be described later with reference to.

The label-port correspondence table 304 shows the path ID,
The correspondence between the label value and the port number is stored, and details thereof will be described later with reference to FIG.

The label table 305 is the LER 11 of FIG.
It is the same as the label table 204 of No. 1.

The entrance and the exit of the network are determined based on the direction of the packet to be transferred. Therefore, the LER basically has both a configuration when arranged at the entrance and a configuration when arranged at the exit. Specifically, each
The LER has all of the components shown in FIGS. 6 and 7.

Since the data transmitting / receiving device is an edge in the network to which it belongs, it has the functions of an ingress router and an egress router.

Further, the data transmitter / receiver, LER, LSR are
Both have the function of transferring control signals as IP packets based on the IP Routing process. BGP, IBG described later
P, EBGP, GPR, GPR response messages, etc. are transferred by this IP packet.

FIG. 8 shows a configuration example of the LSR 81.
Although not shown, the other LSRs 82 to 86 have the same configuration.

The LSR 81 has a path control unit 401, a data transfer unit 402, and a label table 403. The path control unit 401 includes a local label path setting unit 4
Have 11. The local label path setting unit 411 has a function corresponding to the local label path setting unit 211 in the path control unit 201 of the LER 111 in FIG. The data transfer unit 402 has an MPLS data transfer unit 421. The MPLS data transfer unit 421 uses the LER 111 of FIG.
MPLS data transfer unit 211 in the data transfer unit 202
It has the same function as.

Although illustration is omitted, the data transmitting / receiving device is
For example, it is configured by a personal computer or other information processing device.

Next, with reference to FIG. 9, a description will be given of a process when a packet is transferred via a plurality of MPLS networks. Now, assume that a packet is transmitted from the data transmission / reception device 121 to the data transmission / reception device 123.
In this case, the process shown in the flowchart of FIG. 10 is executed.

First, in step S211, an inter-network table generation process is executed. The details of which will be described later with reference to the flowchart of FIG.
Egress router correspondence table 134 (Fig. 5) and LER on the ingress side
The destination-exit router correspondence table 203 (FIG. 6) included in 111-2 and 111-3 is generated, and the LER on the exit side is generated.
A destination-next network entrance router correspondence table 303 (FIG. 7) included in 112-1 and 112-2 is created.

Next, in step S212, label path generation processing is executed. Details of this processing are shown in FIG.
As will be described later with reference to the flowchart of FIG. 5, this process generates a label path, and the extended label table 133 (FIG. 5) of the data transmitter / receiver 121, LER1.
Label tables 204 of 11-2 and 111-3 (FIG. 6) and label tables 3 of LER 112-1 and 112-2
05 (FIG. 7) is created. Further, the label-port correspondence table 304 (FIG. 7) of the LERs 112-1 and 112-2 arranged on the exit side is created.

Then, in step S213, data transfer processing is performed. Details of this processing will be described later with reference to the flowchart of FIG.

Further, if necessary, the label path is deleted by the label path deletion processing in step S214. Details of this processing will be described later with reference to the flowcharts of FIGS. 19 and 20.

FIG. 11 shows details of the inter-network table generation processing in step S211 of FIG. In this embodiment, each MPLS network and BGP
AS (Autonomous System) is set to be the same, and all data transmission / reception devices and LERs are set to function as border routers in AS.

First, in step S231, in the AS as a network controlled by a single policy,
Using IBGP (Internal BGP), a full mesh BGP session is established between the border routers, and the process of exchanging route information is executed. That is, the MPLS network 71-1
In the data transmission / reception device 121, the BGP control unit 144
And the BGP control unit 31 of the LER 112-1 as an egress router
A process for establishing a BGP session with 3 and exchanging route information is executed.

Similarly, in the MPLS network 71-2, the BGP control unit 21 of the LER 111-2 as an ingress router.
4 and the BGP control unit 3 of the LER 112-2 as an egress router
A process of establishing a BGP session with 13 and exchanging route information is executed. In addition, MPLS network 71
-3, BGP of LER111-3 as an ingress router
A process of establishing a BGP session and exchanging route information between the control unit 214 and the BGP control unit 144 of the data transmission / reception device 123 is executed.

In step S232, EBGP is performed between ASes.
Using (External BGP), the border router of the adjacent AS
A process for establishing a BGP session and exchanging route information is executed. That is, the BGP control unit 144 of the data transmission / reception device 121 of the MPLS network 71-1 and the LER 112-1
BGP control unit 313, LER 11 of MPLS network 71-2
1-2 BGP control unit 214, LER 112-2 BGP control unit 313, and MPLS network 71-3 LER 111
-3 BGP control unit 214 and data transmission / reception device 123 BGP
A process of exchanging route information is performed between the control units 144.

Then, in step S233, the BGP control unit 144 of the data transmitting / receiving apparatus 121 and the BGP control unit 21 of the LERs 111-2 and 111-3 as the ingress routers.
4 determines the border router to be the exit from the AS for each destination by referring to the RIB (routing information base) obtained from IBGP, and the destination-exit router correspondence table 13
4, 203. In the MPLS network 71-1, the LER 112-1 is the MPLS network 71-2.
In, the LER 112-2 is set as an egress router.

As a result, for example, a destination-exit router correspondence table as shown in FIG. 12 is created. The destination-exit router correspondence table of FIG. 12 represents an example of the destination-exit router correspondence table 134 of the data transmitting / receiving apparatus 121.

In the example of FIG. 12, the destination 192.16.
8.10.2 (IP address of the data transceiver 123)
192.
168.8.2 (IP address of LER 112-1 is stored).

Next, in step S234, the BGP control unit 313 of the egress router (LER 112-1, 112-2).
Refers to the RIB obtained from EBGP, A for each destination
The border router to be the entrance of S is determined and described in the destination-next network entrance router correspondence table 303. In the MPLS network 71-2, the LER 111-2 is the MPL.
In the S network 71-3, the LER 111-3
Each is considered an entrance router.

As a result, for example, a destination-next network entrance router correspondence table as shown in FIG. 13 is created. In the example of FIG. 13, the destination of the LSR 112-1 is-
An example of the next network entrance router correspondence table 303 is shown. In this example, the IP address 19 of the LER 111-2 is set as the next network ingress router corresponding to the destination 192.168.10.2.
2.168.9.1 is stored.

Details of the label path generation processing in step S212 of FIG. 10 will be described below with reference to FIG.

In step S 261, the local label path setting unit 141 of the data transmitting / receiving apparatus 121 has the MPLS
LER 112 as an exit router of network 71-1
A local label path is set up with the local label path setting unit 311 of -1. The details of this processing are the same as those of the conventional LDP described in RFC3036. By this process,
The label table is created as described above.

In step S262, the global label path setting unit 142 outputs a GPS (Global Path Setup) message to the LER 112-1. This GPS message includes the address of the data transmission / reception device 123 as the end point of the global label path.

In the LER 112-1, the local label path setting unit 311 executes the process of establishing a local label path with the data transmitting / receiving apparatus 121 in step S281, and then in step S282 the global label path setting unit. 312 receives the GPS message from the data transmission / reception device 121. At this time, in step S283, the global label path setting unit 312 transfers the GPS message to the LER 118-2 as the ingress router of the MPLS network 71-2 at the subsequent stage based on the destination-next network ingress router correspondence table 303. .

The global label path setting unit 212 of the LER 111-2, in step S301,
-1 receives the GPS message from the local label path setting unit 211, the destination-exit router correspondence table 203
Based on the above, a local label path is set up with the LER 112-2 as the egress router of the MPLS network 71-2. As mentioned above, this creates a label table at each LER or LSR in this network.

In step S302, the LER111-
The second global label path setting unit 212 transfers the GPS message to the LER 112-2.

The global label path setting unit 312 of the LER 112-2, in step S320,
-2, the process of establishing a local label path is executed, and then in step S321, the GPS of the LER111-2
When the message is received, in step S322,
Global label path setting unit 312 of LER 112-2
On the basis of the destination-next network entrance router correspondence table 303, transfers the GPS message to the LER 111-3 as the entrance router of the MPLS network 71-3 at the subsequent stage.

The global label path setting unit 212 of the MPLS network 72-3, in step S331,
Receive a GPS message from the LER 112-2. In step S332, the local label path setting unit 211 of the LER 111-3 exchanges data with the data transmitting / receiving device 123.
Put a local label path. As a result, the label table is created.

In step S333, LER1
The global label path setting unit 212 of 11-3 uses GPS
The message is transferred to the data transmission / reception device 123.

In step S351, the global label path setting unit 142 of the data transmitter / receiver 123 sets the LE
After performing processing for establishing a local label path with R111-3, in step S352, LER111
-Receive GPS message from -3.

As described above, when the GPS message reaches the data transmission / reception device 123, the entrance label setting unit 143 of the data transmission / reception device 121 requests each device to transmit the entrance label.

In step S353, the global label path setting unit 142 of the data transmitter / receiver 123 determines the GP
The S response message is generated and transmitted to the LER 111-3.

In step S334, the LER111-
When the global label path setting unit 312 of 3 receives the GPS response message from the data transmitting / receiving device 123,
In step S335, the label (entrance label) of LER111-3 is added to the GPS response message, and LER1
Transfer to 12-2.

At step S323, the LER 112-
The second global label path setting unit 312 uses the LER111
-3, when the GPS response message from -3 is received, the label-port correspondence table 304 is created in step S324, and the entrance label added to the GPS response message received from the LER 111-3 is associated with the port number. Describe. That is, in this case, as an entrance router
Since the label of the LER 111-3 is 3, the label 3 is stored in association with the port number and the IP of the global label path currently set.

At step S325, the LER 112-
The second global label path setting unit 312 transfers the GPS response message to the LER 111-2. This GPS response message includes the LER received in the process of step S324.
The label 111-3 is described.

The global label path setting unit 212 of the LER 111-2, at step S303, the LER 112
-2, the label corresponding to the internal route is further added and the GPS response message is transferred to the LER 112-1 in step S304.

In step S284, the global label path setting unit 312 of the LER 112-1 receives the LER 111.
-2, the label value and the port number are described in the label-port correspondence table 304 in step S285.

FIG. 15 shows an example of the label-port correspondence table 304 of the LER 112-1 as an egress router in this way. In this example, the label 1 of the LER 111-2 as the entrance router of the MPLS network 72-2 at the latter stage is stored in the number 1 as the path ID in association with the port number of number 1.

At step S286, the LER 112-
The global label path setting unit 312 of No. 1 transfers the GPS response message to the data transmission / reception device 121. This GP
The S response message contains the ingress label of the LER 111-3 as the ingress router of the MPLS network 71-3 and the MPLS.
LER111 as an entrance router of network 71-2
An entrance label of -2 is added.

In step S263, the global label path setting unit 142 of the data transmitting / receiving apparatus 121 has the LE
When the GPS response message from R112-1 is received, the entrance label value is described in the extended label table 133 in step S264.

FIG. 15 shows an example described in the extended label table 133 of the data transmitting / receiving apparatus 121 in this way.

In this example, the data transmitter / receiver 12
3 is stored as a destination, and the entrance label 3 of the LER 111-3, the entrance label 5 of the LER 111-2, and the LER 81-1 immediately after the data transmission / reception device 121 are correspondingly stored. Label 5 is described.

As described above, the data transmission / reception device 12
1 extended label table 133, LER 112-1, 11
Label tables 20 of 1-2, 112-2, and 111-3
In addition to 4,305, label tables 403 of LSRs 81-1, 81-2, 81-3 are created, and label-port correspondence tables 304 of LERs 112-1, 112-2 as egress routers are created.

When the egress router is connected to a plurality of MPLS networks, each ingress label value needs to be different. Therefore, when the data transmitting / receiving apparatus 121 receives the same ingress label from different MPLS networks, it requests the change. In response to this request, each MPLS network changes the entrance label and notifies the data transmission / reception device 121 of the changed entrance label.

Details of the data transfer process in step S213 in FIG. 10 will be described below with reference to the flowchart in FIG.

In step S401, the label stack unit 162 of the data transmitting / receiving apparatus 121 stores the destination (address of the data transmitting / receiving apparatus 123 of 192.168.10) stored in the extended label table 133 (FIG. 16). .. 2) (corresponding to the path ID of the label path), the ingress label value (3, 5, 5) is read out and stacked in a packet of data to be transferred.

The ingress label values (3, 5, 5) are arranged in order from the ingress label of the local label path in the MPLS network on the downstream side of the label path. In the present case, the most downstream MPLS network 71-
Entry label value 3 of local label label path in 3
Is described first, then the ingress label value 5 of the local label path in the upstream MPLS network 71-2, and finally the ingress label value 5 of the local label path in the MPLS network 71-1 including the data transmitter / receiver 121. Deploy. The MPLS data transfer unit 161 transmits the packet 501 in which the ingress label value is stacked from the output port stored in the extension level table 133 in association with the path ID to the LSR 81-1.

Upon receiving the packet, each device rewrites the transfer label into the next transfer label in accordance with the label table and outputs the packet from the output port stored in the label table corresponding to the transfer label. Transfer to the router at the latter stage.

However, in this embodiment, the device arranged immediately before the exit router of the local label path is
The label rewriting process of the packet is not performed, but the last label deleting process is performed. In the case of the example in FIG. 9, since the LSR 81-1 is arranged immediately before the LER 112-1 which is the exit router of the local label path (MPLS network 71-1), this entrance label deletion processing is executed.

The end point (LER) of each network path
Regarding relabeling with the LSR one before this, Penultimate Hop Pop described in RFC 3031
Processing according to ping is performed.

That is, when the MPLS data transfer unit 421 of the LSR 81-1 obtains the packet 501, (3, 5,
Of the three labels 6), the last transfer label 6 is deleted to leave only the ingress label (3, 5). And MPLS
The data transfer unit 421 sends the packet 502 having the label of (3, 5) to the LER 112-1 from the output port stored in the label table 403 corresponding to the label 6.
Transfer to.

MPLS data transfer unit 321 of LER 112-1
Receives the packet 502 from the LSR 81-1 in step S411, the subsequent (downstream) MPLS network 7 stored in the destination-next network entrance router correspondence table 303 in step S412.
The packet 503 is transferred to the LER 111-2 as the ingress router of 1-2. LER 112 as an exit router-
In No. 1, neither label rewriting processing nor deletion processing is executed.

When the MPLS transfer unit 221 of the LER 111-2 receives the packet 503 from the LER 112-1 in step S421, the MPLS transfer unit 221 corresponds to the final destination (address of the data transceiver 123) in the destination-exit router correspondence table 203. Then, the label path is sent to the exit router (LER 112-2 in this example) that has been stored.
Specifically, the transmission is performed as a packet 504 by changing the last label 5 to the label 1 of the LSR 81-2 according to the label path of the label table 204.

The MPLS transfer section 421 of the LSR 81-2 uses the LER1
When the packet 504 from 11-2 is received, since it is the router immediately before the egress router 112-2 of the MPLS network 71-2, the process of deleting the last label at that time is executed. That is, in the packet 505, (3,
Of the two labels 1), the last label 1 is deleted and the number of labels is only 3.

When the LER 112-2 receives the packet 505 output by the LSR 81-2 in step S431, in step S432, the packet 5 having the label 3 is neither rewritten nor deleted.
06 is transferred to the LER 111-3 as an entrance router of the MPLS network 71-3 at the subsequent stage.

The MPLS data transfer unit 221 of the LER 111-3 as an ingress router of the MPLS network 71-3, at step S441, the upstream MPLS network 7
When the packet 506 transferred from the LER 112-2 as the exit router of 1-2 is received, step S44
2, the last label value 3 is rewritten to the label 2 of the LSR 81-3 which is the next transfer destination router according to the label table 204, and the LSR 81-
Transfer to 3.

When the packet 507 is received, the LSR 81-3 is the router immediately before the data transmitting / receiving apparatus 123 as the egress router of the MPLS network 71-3, and therefore executes the label deleting process to include only the data (label (Not included) as the packet 508, the data transmitting / receiving device 12
Send to 3.

In step S451, the MPLS data transfer section 161 of the data transmitting / receiving apparatus 123 determines that the LER111-
The packet 508 output by 3 is acquired. The label is no longer present in this packet.

As described above, the data transmission / reception device 12
The packet transmitted from No. 1 is received by the data transmission / reception device 123.

In this way, when a packet is transferred via a plurality of MPLS networks, the label (entrance label) of the ingress router of each MPLS network is stacked in the packet, as shown in FIG. The order of this label is described in order from the most downstream entrance label,
At the very end (outside), the most upstream entrance label is described. For this label stack, see RFC3032 M
Processing is performed according to the rules of PLS-Label Stacking.

A port selection label may be added to the label stack in order to select the output port of the egress router. In this case, the output port is selected based on the label value of the MPLS network regardless of Penultimate Hop Popping.

Details of the label path deleting process in step S214 of FIG. 10 will be described below with reference to the flowcharts of FIGS.

The data transmitting / receiving device
When deleting the label table, the LER and LSR temporarily store the record to be deleted, and based on the storage, GPR,
Send and receive GPR response messages.

First, in step S501, the local label path setting unit 141 of the data transmitting / receiving apparatus 121.
Specifies the LER 112-1 as an egress router based on the destination-egress router correspondence table 134, and with it,
Delete the local label path. At this time, the LSR 81-1 and LER 112-1 included in the local label path are also included.
The path data is deleted from the label table of.

In step S502, the global label path setting unit 142 generates a GPR (Global Path Remove) message and sends it to the LER 11 via the LSR 81-1.
Send to 2-1. This GPR message is a message requesting deletion of the global label path, and includes the address of the data transmitting / receiving device 123 as the end point of the global label path.

At step S511, the LER 112-
When the global label path setting unit 312 of No. 1 receives the GPR message from the data transmitting / receiving apparatus 121 in step S512 after executing the process of deleting the local label path with the data transmitting / receiving apparatus 121, the In S513, based on the destination-next network ingress router 303, the LER111-
Transfer to 2.

The global label path setting section 212 of the LER 111-2, in step S521, the LER 112
When the GPR from -1 is received, in step S522, the LER 112-2 as an egress router is specified based on the destination-egress router correspondence table 203, and the local label path is deleted from the LER 112-2. At this time, LSR81-
2, the path data is deleted from the label table of the LER 112-2.

In step S523, the global label path setting unit 212 sends the GPR message to the LER 112-
Transfer to 2.

At step S531, the LER 112-
The second global label path setting unit 312 uses the LER111
-2, the GPR message from the LER 111-2 is received in step S532 after the process of deleting the local label path is executed, and this message is received in step S533 based on the destination-next network ingress router 303. , LER111-3.

The global label path setting unit 212 of the LER 111-3, in step S541,
-2, the data transmission / reception device 123 (exit router) is specified based on the destination-exit router correspondence table 203, and the local label path is deleted with respect to it in step S542. At this time, LSR81
-3, the path data is deleted from the label table.

In step S543, the global label path setting unit 212 sends the GPR message to the LSR81-
3 to the data transmitting / receiving apparatus 123.

In step S551, the local label path setting unit 141 of the data transmitter / receiver 123 determines the LER
111-3, the process of deleting the local label path is executed, and then in step S552, the LER111
-3 receives the GPR message.

In step S601, the global label path setting unit 142 of the data transmitter / receiver 123 sets the GP
R response message is sent to LER111 via LSR81-3.
-3.

In step S611, the LER111-
When the global label path setting unit 212 of No. 3 receives the GPR response message from the data transmitting / receiving device 123,
In step S612, the GPR response message is sent to LER1.
Transfer to 12-2.

The global label path setting unit 312 of the LER 112-2, at step S621,
When the GPR response message from -3 is received, the data of the path to be deleted is deleted from the label-port correspondence table 304 in step S622. Step S6
At 23, the global label path setting unit 312 of the LER 112-2 transfers the GPR response message to the LER 111-2 via the LSR 81-2.

The global label path setting unit 212 of the LER 111-2, in step S631,
-2, the GPR response message is received by the LER 112-1 in step S632.
Transfer to.

The global label path setting unit 312 of the LER 112-1 determines in step S641 the LER 111
-2, the PGR response message is sent to the LSR 81-1 in step S642.
To the data transmission / reception device 121 via the.

The global label path setting unit 142 of the data transmitting / receiving apparatus 121, in step S651, sets the LE
The PGR response message from R112-1 is sent to LSR81-1
To receive via. In step S652, the global label path setting unit 142 causes the extended label table 1
The data of the path to be deleted is deleted from 33.

As described above, the data of the unnecessary path is deleted as needed.

In the above processing example, the route of the global label path is set based on the IP routing method of BGP.
It is also possible to add the information of each label edge router forming the path to the message. FIG. 21 shows
An example of a GPS message in this case is shown.

In the example of FIG. 21, following the IP header, GPS indicating that this packet is a GPS message
A header is added. In addition, a list of IP addresses of ingress routers and egress routers on the path is added after that.

In this example, the GPS message is
The destination address of the IP packet header is changed to the IP address listed first in the list, and the IP address is transferred to the destination indicated by the address. When it arrives at the first address in the list, the address value listed second in the list is written to the destination address in the IP packet header and the GPS message is forwarded to that address.

Thereafter, the same processing is repeated until the data transmitting / receiving apparatus located at the end point of the global label path is GP
S Message is forwarded.

When the GPS message arrives, the ingress router and the egress router of each MPLS network perform the local label setting process as in the above-described embodiment. The global label path is deleted by the same process.

The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processes is executed by software, a program that constitutes the software executes a variety of functions by installing a computer in which dedicated hardware is installed or various programs. It is installed from a network or a recording medium into a general-purpose personal computer or the like capable of performing the above.

This recording medium is a magnetic disk (including a floppy disk) on which a program is recorded and an optical disk (CD-ROM (Compact Disk- Read Only
Memory), DVD (including Digital Versatile Disk), magneto-optical disk (including MD (Mini-Disk)), semiconductor memory, or other package media, and is pre-installed in the device body. ROM in which the program is recorded, which is provided to the user in the state
It is composed of a hard disk, etc.

In the present specification, the steps for describing the program recorded on the recording medium are not limited to the processing performed in time series in the order described, but are not necessarily performed in time series. It also includes processing executed in parallel or individually.

In this specification, the system means
It represents the entire apparatus composed of a plurality of devices.

As described above, according to the present invention, a plurality of
It becomes possible to perform communication across the MPLS network. Then, at that time, it is not necessary to analyze the layer 3 header even when the MPLS network is changed,
The transfer rate can be increased accordingly. In addition, the load can be reduced accordingly.

Further, since it is not necessary to refer to the header of layer 3, it is possible to eliminate the restriction of the protocol used in layer 3 and above, and it is possible to carry out communication by an arbitrary protocol, that is, protocol-free communication.

Further, if one network is enlarged, it is not necessary to analyze the layer 3 header at least in the network, so that the transfer processing in the network can be speeded up.
In that case, there is no choice but to increase the number of labels in one network, and if the number of labels is represented by 20 bits, the number of nodes cannot be increased beyond that number. On the other hand, in the present invention, a plurality of
Since it is possible to connect MPLS networks while retaining their advantages, a new MPLS network can be created when the number of nodes in one MPLS network is saturated, and the number of nodes is not limited. .

Further, by only slightly modifying the conventional LER mechanism, MPLS communication across a plurality of MPLS networks becomes possible. Therefore, it is not necessary to make a drastic correction to the entire existing network, and it is possible to realize a faster network at a lower cost by merely making a partial correction.

[0164]

As described above, according to the present invention, it is possible to easily and quickly transfer data without complicating the structure.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a conventional MPLS network.

FIG. 2 is a diagram illustrating a configuration of a conventional network including an IP network and an MPLS network.

3 is a diagram illustrating a configuration of a packet used in the network system of FIG.

FIG. 4 is a diagram showing a configuration of an MPLS network to which the present invention is applied.

FIG. 5 is a block diagram showing a configuration of a data transmission / reception device.

FIG. 6 is a block diagram showing a configuration of a label edge router as an ingress router.

FIG. 7 is a block diagram showing a configuration of a label edge router as an egress router.

FIG. 8 is a block diagram showing a configuration of a label switch router.

FIG. 9 is a diagram showing a configuration of a network system configured by a plurality of MPLS networks.

FIG. 10 is a flowchart illustrating a process of the network system of FIG.

11 is a flowchart illustrating the details of the inter-network table generation processing in step S211 of FIG.

FIG. 12 is a diagram showing an example of a destination-exit router correspondence table.

FIG. 13 is a diagram showing an example of a destination-next network entrance router correspondence table.

FIG. 14 is a flowchart illustrating details of label path generation processing in step S212 of FIG.

FIG. 15 is a diagram showing an example of a label-port correspondence table.

FIG. 16 is a diagram showing an example of an extended label table.

FIG. 17 is a flowchart illustrating details of the data transfer process in step S213 of FIG.

FIG. 18 is a diagram showing a structure of an MPLS packet with label stacking.

FIG. 19 is a flowchart illustrating details of label path deletion processing in step S214 of FIG.

20 is a flowchart illustrating details of label path deletion processing in step S214 of FIG.

FIG. 21 is a diagram showing a GPS message format when a path is explicitly designated.

[Explanation of symbols]

11, 12, 13 Data transmitter / receiver, 71-1 to 71-3 MPLS network, 81-1 to 82-3
LSR, 111-2, 111-3, 112-1, 11
2-2 LER, 201 path control unit, 202 data transmission unit, 203 destination-exit router correspondence table, 20
4 label table, 211 local label path setting unit, 212 global label path setting unit, 21
3 entrance label setting unit, 214 BGP control unit, 22
1 MPLS data transfer unit, 301 path control unit, 302
Data transfer unit, 303 destination-next network entrance router correspondence table, 304 label-port correspondence table, 3
05 label table, 311 local label path setting unit, 312 global label path setting unit, 31
3 BGP control unit, 321 MPLS data transfer unit, 40
1-path control unit, 402 data transfer unit, 403
Label table, 411 local label path setting unit, 421 MPLS data transfer unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jun Onoe             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5K030 HA08 HB11 HD03

Claims (22)

[Claims] 1. A data transmission system for transmitting data from a first data transmission / reception device to a second data transmission / reception device via a plurality of networks, wherein the first data transmission / reception device is provided at an entrance of a plurality of the networks. Requesting each device located to set a route in the network to which the device belongs, and each of the devices located at the entrance of the plurality of networks is based on a request from the first data transmitting / receiving device. And sets a route in the network to which the device belongs, and notifies the first data transmission / reception device of a label corresponding to an internal route, and the first data transmission / reception device sets the label Data transmission, characterized in that a packet containing data is transmitted to the second data transmitting / receiving device via the network. system. 2. The first data transmission / reception device sequentially arranges, in the packet, labels used to determine internal routes of the plurality of networks from the downstream side of the route. The described data transmission system. 3. The data transmission system according to claim 1, wherein the first data transmission / reception device acquires the label using a border gateway protocol. 4. A data transmission method of a data transmission system for transmitting data from a first data transmitting / receiving device to a second data transmitting / receiving device via a plurality of networks, wherein the first data transmitting / receiving device has a plurality of Requesting each device located at the entrance of the network to set a route in the network to which the device belongs, each of the devices located at the entrance of the plurality of networks from the first data transmission / reception device On the basis of the request, the route in the network to which the device belongs is set, and the label corresponding to the internal route is notified to the first data transmitting / receiving device, and the first data transmitting / receiving device is notified. And transmitting a packet including the label and data to the second data transmitting / receiving device via the network. And data transmission method. 5. In an information processing device for transmitting data to another information processing device via a plurality of networks, a route in the network to which the device belongs to each device located at the entrance of the plurality of networks. Requesting means for requesting the setting of, a acquiring means for acquiring a label used for determining the internal routes of the plurality of networks, and a packet including the label and the data acquired by the acquiring means via a plurality of the networks. And a transmission unit for transmitting the information to the other information processing apparatus. 6. The information processing according to claim 5, wherein the transmission means sequentially arranges, in the packet, labels used for determining internal routes of the plurality of networks from the downstream side of the route. apparatus. 7. The network according to claim 5, wherein the plurality of networks are networks based on multi-protocol label switching, and the requesting unit executes the request based on a label distribution protocol. Information processing equipment. 8. The information processing apparatus according to claim 5, wherein the acquisition unit acquires the label using a border gateway protocol. 9. An information processing method of an information processing device for transmitting data to another information processing device via a plurality of networks, wherein said device belongs to each device located at the entrance of said plurality of networks. A request step for requesting the setting of a route in the network, an obtaining step for obtaining a label used to determine the internal routes of the plurality of networks, and a packet including the label and the data obtained by the process of the obtaining step, And a transmission step of transmitting the information to the other information processing apparatus via a plurality of the networks. 10. A program for an information processing device for transmitting data to another information processing device via a plurality of networks, wherein the device belongs to each device located at the entrance of the plurality of networks. A request step for requesting the setting of a route within the network, an obtaining step for obtaining a label used for determining the internal routes of the plurality of networks, and a packet including the label and data obtained by the process of the obtaining step, And a transmission step of transmitting the information to the another information processing apparatus via a plurality of the networks, the recording medium having a computer-readable program recorded thereon. 11. A computer for controlling an information processing device that transmits data to another information processing device via a plurality of networks, wherein the device belongs to each device located at the entrance of the plurality of networks. A request step for requesting the setting of a route within the network, an obtaining step for obtaining a label used for determining the internal routes of the plurality of networks, and a packet including the label and data obtained by the process of the obtaining step, And a transmission step of transmitting the information to the other information processing apparatus via a plurality of the networks. 12. An information processing apparatus, which is located at an entrance of a network and transfers data transmitted from a first data transmitting / receiving apparatus to a second data transmitting / receiving apparatus via the network, wherein the first data transmitting / receiving apparatus is provided. From the above, receiving means for receiving a request for setting a path for data transmission in the network, and setting the path in the network based on the request from the first data transmitting / receiving device received by the receiving means. A setting unit; a notifying unit for notifying the first data transmitting / receiving device of a label according to an internal path; and the label and data transmitted by the first data transmitting / receiving device and notified by the notifying unit. Transfer means for transferring a packet to the second data transmission / reception device via the network. The information processing apparatus according to claim. 13. The information processing apparatus according to claim 12, wherein the network is a network based on multi-protocol label switching. 14. An information processing method for an information processing apparatus, which is located at an entrance of a network and transfers data transmitted from a first data transmitting / receiving apparatus to a second data transmitting / receiving apparatus via the network, Receiving a request for setting a path for data transmission in the network from the data transmitting / receiving apparatus, and the network based on the request from the first data transmitting / receiving apparatus received by the processing in the receiving step. And a notification step of notifying the label according to the internal path to the first data transmitting / receiving apparatus, and a notification step transmitted by the first data transmitting / receiving apparatus. A packet including the label and data is transmitted via the network to the second data. The information processing method characterized by comprising a transfer step of transferring to the communication apparatus. 15. A program of an information processing apparatus, which is located at an entrance of a network and transfers data transmitted from a first data transmitting / receiving apparatus to a second data transmitting / receiving apparatus via the network, the program comprising: A receiving step of receiving a request for setting a path for data transmission in the network from the data transmitting / receiving apparatus, and the network based on the request from the first data transmitting / receiving apparatus received by the processing of the receiving step. And a notification step of notifying the label according to the internal path to the first data transmitting / receiving apparatus, and a notification step transmitted by the first data transmitting / receiving apparatus. A packet including the label and data is transmitted / received via the network to the second data. Recording medium readable program computer, which comprises a transfer step of transferring devices are recorded. 16. A computer for controlling an information processing device, which is located at an entrance of a network and transfers data transmitted from a first data transmitting / receiving device to a second data transmitting / receiving device via the network, Receiving a request for setting a path for data transmission in the network from the data transmitting / receiving apparatus, and the network based on the request from the first data transmitting / receiving apparatus received by the processing in the receiving step. And a notification step of notifying the label according to the internal path to the first data transmitting / receiving apparatus, and a notification step transmitted by the first data transmitting / receiving apparatus. A packet including the label and data is transferred to the second data via the network. Program for executing a transfer step of transferring to a receiving device. 17. Located at the exit of the first network,
An information processing apparatus for transferring data transmitted from a first data transmitting / receiving apparatus to a second data transmitting / receiving apparatus via a second network in a subsequent stage, the network being transmitted from the first data transmitting / receiving apparatus. Receiving means for receiving a request for setting a path for data transmission in the above, and other information for receiving the request from the first data transmitting / receiving device received by the receiving means at the entrance of the second network. An information processing device, comprising: a request transfer unit for transferring to a processing device. 18. A label for transferring information about a label transmitted from the other information processing device located at the entrance of the second network to the first data transmission / reception device via the first network. The information processing apparatus according to claim 17, further comprising a transfer unit. 19. The first network and the second network are networks based on multiprotocol label switching.
7. The information processing device according to 7. 20. Located at the exit of the first network,
An information processing method for an information processing apparatus, comprising: transferring data transmitted from a first data transmitting / receiving apparatus to a second data transmitting / receiving apparatus via a second network in a subsequent stage; Further, a receiving step of receiving a request for setting a path for data transmission in the network, and a request from the first data transmitting / receiving device received by the processing of the receiving step, And a request transfer step of transferring to another information processing apparatus located at. 21. Located at the exit of the first network,
A program of an information processing device for transferring data transmitted from a first data transmission / reception device to a second data transmission / reception device via a second network at a subsequent stage, the program comprising:
A receiving step of receiving a request for setting a route for data transmission in the network, which is transmitted from the data transmitting / receiving apparatus, and a request from the first data transmitting / receiving apparatus received by the processing of the receiving step, A request transfer step of transferring to another information processing device located at the entrance of the second network, the recording medium having a computer-readable program recorded thereon. 22. Located at the exit of the first network,
The data transmitted from the first data transmission / reception device is transmitted from the first data transmission / reception device to a computer that controls an information processing device that transfers the data to the second data transmission / reception device via the second network in the subsequent stage. Further, a receiving step of receiving a request for setting a path for data transmission in the network, and a request from the first data transmitting / receiving device received by the processing of the receiving step, And a request transfer step of transferring to another information processing apparatus located at.