JP4951637B2 - Data transfer method, terminal node, and boundary node - Google Patents

Description

  The present invention relates to a data transfer method, a termination node, and a boundary node.

  SDH (Synchronous Digital Hierarchy) is widely used as a data communication technique for a carrier network, which is a backbone network installed by a communication carrier. Recently, research and development such as MPLS (Multi Protocol Label Switching) and PBB-TE (Provider Backbone Bridge Traffic Engineering) have been promoted as techniques for increasing the speed and capacity of data transfer using routers. Yes. As such a new data communication technology is developed and introduced, it is required to provide a wide area service by a multi-domain network using a plurality of different domains.

  Here, the domain refers to the entire region of a certain carrier network or each region obtained by dividing a certain carrier network. In the former case, the data communication technology may be different for each carrier (communication carrier). In the latter case, even in the network of the same carrier, each area such as SDH as a conventional technology and MPLS as a new technology are mixed. Depending on (domain), data communication technology may be different.

  FIG. 6 is a diagram illustrating a network in which a plurality of domains are connected. As shown in FIG. 6, for example, when a communication provider provides a service such as a wide area Ethernet (registered trademark) service or an ATM (Asynchronous Transfer Mode) leased line service, a new technology is introduced for each domain. In one service, different data communication technologies such as SDH and MPLS are used.

  In addition, in the prior art, as service line identification information when connecting between domains, Service VLAN IDs in Pseudowire (PW) (Non-patent Document 1) and Ethernet (registered trademark) (IEEE 802.1ad) frames using an MPLS Shim header (S-VID) (Non-Patent Document 2) and the like.

Ping Pan, “draft-pan-pwe3-ober-sub-ip-01”, IETF Internet-Draft, December 2005. IEEE 802.1ad-Provider Bridges, [online]. IEEE, 2008. [retrieved on 2009-01-23]. Retrieved from the Internet: <URL: http: //www.ieee802.org/1/pages/802.1ad. html>.

  However, since the boundary node of the conventional domain terminates the service on the premise of a single domain having the same data communication technology, each of the border nodes in each domain has a plurality of data communication technologies. A service is temporarily terminated in a domain, and different domains are connected to transfer data at a service layer that is a layer for controlling data communication in the service.

  FIG. 7 is a diagram illustrating an example in which a plurality of data communication technologies are applied to a multi-domain network in the conventional technology. In FIG. 7, three domains 10X, 10Y, and 10Z are connected to form a multi-domain network 900. In this case, for example, the boundary node 9D of the domain 10X transfers the data to the boundary node 9E belonging to the different domain 10Y. Therefore, the header of the transport layer 103 set for each domain 10 and the service line identification layer 105 (See reference numeral 901). Then, the boundary node 9D sets a boundary node 9E as a transfer destination in the service layer 101, and performs data communication.

  Therefore, the boundary node 9 of each domain 10 performs processing in the transport layer 103 that realizes the transfer in each domain 10 and the service line identification layer 105 that performs service line identification for specifying the user of each service, It is also necessary to support the processing of the service layer 101. This means that all boundary nodes 9 in each domain 10 need to correspond to all service types accommodated in the multi-domain network 900. In other words, when a plurality of services such as a wide area Ethernet (registered trademark) service and an ATM leased line service are accommodated, data transfer cannot be performed unless all the boundary nodes 9 have a function of processing each header. Become.

  The present invention has been made in view of such a background, and the present invention makes it unnecessary for the boundary node of each domain to process the header corresponding to each service accommodated in the multi-domain network. An object is to provide a data transfer method, a termination node, and a boundary node.

  In order to solve the above-described problem, the invention according to claim 1 is a data transfer method in a multi-domain network in which a plurality of domains are connected in a network, wherein the data is transmitted from a first network other than the multi-domain network. The first terminal node that has received the service information stores service line information including a service line number for identifying a user of the communication service in the first domain that is the domain including the first terminal node. A destination address of a header of a service layer for controlling data communication in a communication service provided by the network for the received data, and the multi-domain network among the nodes in the multi-domain network. Connect to a second network other than A header of a universal layer, which is a layer for transferring data in all domains in the multi-domain network, is added to the data in the first domain A service line number for identifying a service user is set on the basis of service line information stored in the storage unit, and the data in the universal layer header is transferred in the first domain. A border node in the first domain, which adds a transport layer header for transmitting the data, transmits the data to a relay node in the first domain, and receives the data from the relay node, When transmitting the data to a second domain connected to the first domain, the first domain And the second domain, a storage unit storing service line information including a service line number for specifying a user of the communication service is deleted, and a header of the transport layer of the data is deleted And changing the header of the universal layer to the service line number in the link between the first domain and the second domain based on the service line information stored in the storage unit, The boundary node in the second domain that has transmitted the data to the boundary node in the domain of the first domain and received the data from the boundary node in the first domain is configured to transmit the communication service in the second domain. A storage unit that stores service line information including a service line number for identifying a user of the user; The transport layer for changing the header of the universal layer to the service line number in the second domain based on the service line information stored in the storage unit and transferring the inside of the second domain The second terminal node in the second domain, which has transmitted the data to the relay node in the second domain and received the data from the relay node, transmits the data to the relay node in the second domain. Deleting the transport layer header and the universal layer header, and changing the destination address of the service layer of the data to the destination address of the node serving as the transmission destination of the second network, Features.

  In this way, in the multi-domain network, the service layer header is processed at each boundary node by introducing a universal layer that is a layer extending from the first terminal node to the second terminal node. Can eliminate the need to do.

  Specifically, the first terminal node in the multi-domain network that has received data from another network changes the service layer destination address of the received data to the destination address of the second terminal node, and Add a universal layer header throughout the domain network. As a result, the service layer header can be encapsulated to transfer data. Subsequently, a transport layer header for transferring the domain is added to the data with the universal layer header added, and the data is transferred to the relay node.

  When a border node connected to another domain receives data from a relay node in its own domain, the border node deletes the transport layer header and changes the universal layer header. , Transfer data to the border node of the other domain to connect.

  At this time, since the header of the service layer is encapsulated in the boundary node in the multi-domain network, it is not necessary to process the service layer in each boundary node. That is, it is possible to eliminate the need for the boundary node to have a function of processing a header corresponding to each service accommodated in the multi-domain network.

  The invention according to claim 2 is a terminal node connected to a network other than the multi-domain network in a multi-domain network in which a plurality of domains are connected in the network, and transmits and receives data. A communication unit that receives the data from a first network other than the multi-domain network and transmits the data to a second network other than the multi-domain network, and an address including a destination address related to a node to which the data is transferred And a storage unit storing service line information including a service line number for specifying a user of the communication service, and the terminal node is connected to the first network and receives the data If it is the first terminal node, the receiving node For the received data, the destination address of the header of the service layer for controlling data communication in the communication service provided by the network is used as the second address other than the multi-domain network by using the address information stored in the storage unit. A destination address of a second terminal node connected to the network, and a header of a universal layer, which is a layer for transferring data in all domains in the multi-domain network, is added to the received data, The service line number in the first domain which is the domain including the first terminal node is set based on service line information stored in the storage unit, and the universal layer header is added to the data To transfer within the first domain A transport layer header is added, the data is transmitted to the relay node in the first domain via the communication unit, and the terminal node is a second terminal node connected to a second network In this case, the transport layer header added to the transmitted data and the universal layer header are deleted, and the destination address of the service layer header of the data is changed to the address information stored in the storage unit. And changing to a destination address of a node serving as a transmission destination of a second network other than the multi-domain network, and transmitting the data to the second network via the communication unit. .

  By doing so, when the terminal node is the first terminal node connected to the first network, the first terminal node sets the destination address of the service layer to the destination address of the second terminal node. Set. The first terminal node then encapsulates the service layer header by adding a universal layer header. Furthermore, it is possible to transfer data by adding a transport layer header to data to which a universal layer header is added.

  In addition, when the terminal node is a second terminal node connected to the second network, the second terminal node deletes the transport layer header and universal layer header added to the received data. Then, the data can be transmitted by changing the destination address of the service layer to the destination address of the node serving as the transmission destination of the second network.

  The invention according to claim 3 is a boundary node that transmits and receives data between the domains in a multi-domain network in which a plurality of domains are connected in the network, and the boundary node transmits the data between the domains. A communication unit that performs transmission and reception; and a storage unit that stores address information regarding a node to which the data is transferred and service line information including a service line number for specifying a user of the communication service, and the network A header of a universal layer, which is a layer for transferring data in all domains in the multi-domain network, is added to a header of a service layer for controlling data communication in a communication service provided by Transport layer for transporting For the data to which a header is added, when the boundary node is a first boundary node that receives the data from a relay node in the first domain to which the boundary node itself belongs, the transport layer of the data In the link directed to the second boundary node in the second domain connected to the boundary node based on the service line information stored in the storage unit. The service line number is changed, the data is transmitted to a second boundary node in the second domain, and the boundary node receives the data from the first boundary node in the first domain. When the second boundary node in the second domain, the universal layer header is stored in the storage unit. Based on line information, change to the service line number in the second domain, add a header of the transport layer for transferring in the second domain, and relay in the second domain The data is transmitted to a node.

  In this way, the first boundary node in the first domain adds the universal layer header to the service layer header and further transfers the data with the transport layer header from the relay node. When received, the transport layer header is deleted, the universal layer header is changed to the service line number in the link directed to the second boundary node, and data is transmitted to the second boundary node. it can. Therefore, the header of the service layer can be kept encapsulated in the first boundary node. That is, it is possible to eliminate the necessity of providing a function for processing a header corresponding to each service at the boundary node in the multi-domain network.

  If the boundary node is the second boundary node in the second domain that has received data from the first boundary node in the first domain, the service line number in the universal layer header is changed, A transport layer header can be added to transmit data to the relay node in the second domain.

  The invention according to claim 4 is a data transfer method in a multi-domain network in which a plurality of domains are connected in the network, wherein the first termination receives the data from a first network other than the multi-domain network. For the received data, a destination address of a header of a service layer for controlling data communication in a communication service provided by the network is set to a destination address other than the multi-domain network among the nodes in the multi-domain network. Set to a destination address of a second terminal node connected to the second network, and adds a universal layer header, which is a layer for transferring data in all domains in the multi-domain network, to the data, Malt A service line number for specifying a service user in an in-network is set, and a transport layer header for transferring the first domain is added to the data to which the universal layer header is added. The boundary node in the first domain that transmits the data to the relay node in the first domain and receives the data from the relay node connects to the first domain. When transmitting the data to a domain, it is a layer that controls the connection between the boundary node in the first domain and the boundary node in the second domain by deleting the header of the transport layer of the data A header of a boundary node connection layer is added, and the data is transmitted to the boundary node in the second domain, and the first domain The transport for the border node in the second domain that has received the data from the border node in the Internet to delete the border node connection layer header of the data and transfer the data in the second domain A second end node in the second domain, which adds a layer header, transmits the data to a relay node in the second domain, and receives the data from the relay node; Deleting the transport layer header of the data and the universal layer header, changing the destination address of the service layer of the data to the destination address of the node that is the destination of the second network, It is characterized by.

  Thus, according to the data transfer method according to the present embodiment, since the header of the service layer is encapsulated in the boundary node in the multi-domain network, each boundary node needs to process the service layer. There is no. That is, it is possible to eliminate the need for the boundary node to have a function of processing a header corresponding to each service accommodated in the multi-domain network. In addition, since the universal layer header is also encapsulated, universal layer processing at the boundary node can be eliminated.

  The invention according to claim 5 is a boundary node that transmits and receives data between the domains in a multi-domain network in which a plurality of domains are connected in the network, and the boundary node transmits the data between the domains. A communication unit that performs transmission and reception; and a storage unit that stores address information related to a node to which the data is transferred, and in a header of a service layer for controlling data communication in a communication service provided by the network, For the data to which a universal layer header that is a layer for transferring data in all domains in a multi-domain network is added and a transport layer header for transferring the domain is added, the boundary The node belongs to the border node itself If it is a boundary node that receives the data from a relay node in one domain, the header of the transport layer of the data is deleted, and a boundary node in the first domain and a first node connected to the boundary node A header of a boundary node connection layer that is a layer for controlling communication with a boundary node in the second domain, and transmits the data to the boundary node in the second domain. For deleting the boundary node connection layer header of the data and transferring the data in the second domain when the data is the boundary node in the second domain that has received the data from the boundary node in the domain. A header of the transport layer is added, and the data is transmitted to a relay node in the second domain.

  By doing in this way, when the boundary node in the first domain receives the data in which the universal layer header is added to the service layer header and the transport layer header is further added from the relay node, The transport layer header can be deleted, the border node connection layer header added, and the data sent to the border node in the second domain. Thus, at the border node in the first domain, the service layer header can remain encapsulated and does not need to be processed. That is, it is possible to eliminate the necessity of providing a function for processing a header corresponding to each service at the boundary node in the multi-domain network. Further, by adding the header of the boundary node connection layer, the header of the universal layer can also be encapsulated, and the control in the universal layer can be made unnecessary at the boundary node.

  If the boundary node is a boundary node in the second domain that has received data from the boundary node in the first domain, the boundary node connection layer is deleted and a transport layer header is added, Data can be transmitted to a relay node in the second domain.

  According to the present invention, there is provided a data transfer method, a termination node, and a boundary node that can prevent the boundary node of each domain from processing a header corresponding to each service accommodated in the multi-domain network. can do.

It is a figure which shows the structural example of the multi-domain network which concerns on this Embodiment 1. FIG. It is a functional block diagram which shows the structural example of the termination | terminus node which concerns on this Embodiment 1. FIG. It is a functional block diagram which shows the structural example of the boundary node which concerns on this Embodiment 1. FIG. It is a figure which shows the structural example of the multi-domain network which concerns on this Embodiment 2. FIG. It is a functional block diagram which shows the structural example of the boundary node which concerns on this Embodiment 2. FIG. It is a figure which shows the network with which the some domain was connected. It is a figure which shows the example which applied the some data communication technique to the multi-domain network in the prior art.

  Next, modes for carrying out the invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. First, an outline of data communication in the multi-domain network 100 according to the first embodiment will be described with reference to FIG. In this embodiment, the data may be an IP (Internet Protocol) packet, an Ethernet (registered trademark) frame, or the like, but will be described as transmitting an IP packet.

(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration example of a multi-domain network 100 according to the first embodiment. As shown in FIG. 1, the multi-domain network 100 includes a plurality of domains 10 (domains 10X, 10Y, 10Z). Each domain 10 includes a boundary node 2, a relay node 3, and a link 4 that connects the nodes. A boundary node 2 that is connected to a node belonging to a network other than the multi-domain network 100 and transmits / receives data to / from the node is referred to as a termination node 1.

  The multi-domain network 100 according to the first embodiment shown in FIG. 1 is different from the multi-domain network 900 according to the prior art shown in FIG. 7 in that (1) the destination address setting destination of the service layer 101 is a domain boundary It is different in that it is not a node (boundary node 9D in FIG. 7) but a terminal node 1 (terminal node 1L in FIG. 1) of the multi-domain network 100. Further, (2) instead of the service line identification layer 105 (see FIG. 7) terminating for each domain, a universal layer 102 set throughout the entire multi-domain network 100 is set.

  That is, the termination node 1A (see FIG. 1) that has received data from a node belonging to a network other than the multi-domain network 100 sends the destination address of the service layer 101 to the termination node 1L that is a node that is an exit of the multi-domain network 100. Set. Then, instead of the service line identification layer 105 (see FIG. 7) terminated for each domain shown in FIG. 7, a universal layer 102 (see FIG. 1) set across all domains is provided. The end node 1A adds a header of the universal layer 102 including a service line number (for example, service line number “1”) for identifying the service user to the header of the service layer 101. With this process, the header of the service layer 101 is encapsulated. Next, the terminal node 1A adds the header of the transport layer 103 and transfers it to the relay node 3 in the domain 10X.

  The boundary node 2D that has received the data from the relay node 3 deletes the header of the transport layer 103. Then, the boundary node 2D changes the header of the universal layer 102 to the service line number (for example, service line number “2”) in the link 4 between the boundary nodes 2D-2E, and the data is changed to the boundary node 2E of the domain 10Y. Forward to. Then, the boundary node 2E that has received the data from the boundary node 2D changes the header of the universal layer 102 to the service line number (for example, the service line number “3”) in the domain 10Y. Further, the boundary node 2E adds the header of the transport layer 103 and transfers the data to the relay node 3 in the domain 10Y.

  By doing so, the header of the service layer 101 in the multi-domain network 100 in FIG. 1 remains “L”, and is not processed by the boundary node 2 or the relay node 3 but transferred to the terminal node 1L. can do. That is, it is not necessary for each boundary node 2 to have a function of processing a header corresponding to each service.

  Hereinafter, specific functions of the terminal node 1 and the boundary node 2 constituting the multi-domain network 100 will be described first, and then a data transfer method as the entire multi-domain network 100 will be described in detail.

(Terminal node)
FIG. 2 is a functional block diagram illustrating a configuration example of the termination node 1 according to the first embodiment. As shown in FIG. 2, the terminal node 1 includes a control unit 20, a communication unit 30, and a storage unit 40 (see FIG. 1 as appropriate). The function of the control unit 20 is realized by, for example, a CPU (Central Processing Unit) included in the terminal node 1 developing and executing a program stored in the storage unit 40 in the memory.

  The control unit 20 is responsible for overall data transfer processing, and includes a layer processing unit 210 and a data transfer unit 250. The layer processing unit 210 adds / deletes a header for each layer of data to be transmitted / received, and includes a service layer processing unit 220, a first universal layer processing unit 230, and a transport layer processing unit 240. Consists of. Further, the data transfer unit 250 performs a process of transferring the data for which the header of each layer is controlled by the layer processing unit 210 to another node via the communication unit 30.

  The service layer processing unit 220 in the layer processing unit 210 includes an address recognition unit 221 and an address change unit 222. The address recognition unit 221 recognizes a destination address that is a transfer destination of data attached to the header of the service layer 101. Further, the address changing unit 222 performs a process of replacing the destination address added to the header with the destination address serving as the transfer destination based on the address information 41 described later stored in the storage unit 40. The address changing unit 222, when the terminal node 1 is the terminal node 1 that has received data from a node belonging to another network, sets the destination address of the service layer 101 as another data outlet in the multi-domain network 100. Set to the destination address of terminal node 1.

  The first universal layer processing unit 230 adds / deletes the header of the universal layer 102 for controlling data through all the domains 10 in the multi-domain network 100 to the header of the service layer 101, and recognizes the line number. A section 231, a header addition section 232, and a header deletion section 233. The line number recognizing unit 231 recognizes a service line number for specifying a service user attached to the header of the universal layer 102. Then, the header addition unit 232 adds the universal layer 101 header to the service layer 102 header. With this process, the header of the service layer 101 is encapsulated. The header deletion unit 233 deletes the universal layer 102 header attached to the data received via the communication unit 30.

  The transport layer processing unit 240 adds or deletes the header of the transport layer 103 necessary for performing transfer within the domain 10 to the header of the universal layer 102, and transfers the transfer identifier recognition unit 241 and the header addition unit. 242 and a header deletion unit 243. The transfer identifier recognition unit 241 recognizes a transfer identifier attached to the header of the transport layer 103. The header adding unit 242 adds the header of the transport layer 103 to the header of the universal layer 102. By this processing, the header of the universal layer 102 is encapsulated. The header deletion unit 243 deletes the header of the transport layer 103 attached to the data received via the communication unit 30.

  Next, the communication unit 30 includes a first interface 31 connected to a node in the multi-domain network 100 and a second interface 32 connected to a node belonging to another network outside the multi-domain network 100. Consists of.

  The storage unit 40 includes storage means such as a RAM (Random Access Memory), a hard disk, and a flash memory, and stores address information 41 and service line information 42. The address information 41 stores a destination address related to a node that is a data transfer destination in the multi-domain network 1, and also identifies identification information (transfer identifier or the like) of a node that is a data transfer destination for a node connected to its own node. ) Is stored. In the service line information 42, a service line number, which is identification information for specifying a service user, is set and stored for each domain 10. For example, a service line number is designated for each company, and information for identifying a user of a service provided by a communication carrier is stored.

(Boundary node)
Next, the boundary node 2 in the multi-domain network 100 will be described. FIG. 3 is a functional block diagram illustrating a configuration example of the boundary node 2 according to the first embodiment. As shown in FIG. 3, the boundary node 2 includes a control unit 20, a communication unit 30, and a storage unit 40 (see FIG. 1 as appropriate). The function of the control unit 20 is realized by, for example, the CPU provided in the boundary node 2 developing and executing a program stored in the storage unit 40 in the memory.

  The control unit 20 is responsible for overall data transfer processing, and includes a layer processing unit 210 and a data transfer unit 250. The layer processing unit 210 includes a second universal layer processing unit 260 and a transport layer processing unit 240. Here, the processing of the data transfer unit 250 and the transport layer processing unit 240 is the same as that of the terminal node 1 described in FIG.

  The second universal layer processing unit 260 includes a line number recognition unit 261 and a line number change unit 262. The line number recognition unit 261 recognizes the service line number attached to the header of the universal layer 102. Further, the line number changing unit 262 changes the service line number recognized by the line number recognizing unit 261. Specifically, when the boundary node 2 is a node that transfers data to the boundary node 2 of another domain 10, the storage unit 40 stores the service line number that identifies the service user in the link 4 between the boundary nodes 2. It is changed based on the service line information 42 within. If the boundary node 2 is the boundary node 2 that transfers data in its own domain 10, it is changed to a service line number that identifies a service user in that domain 10.

  The communication unit 30 includes a third interface 33 connected to the relay node 3 in the same domain 10 and a fourth interface 34 connected to the boundary node 2 in a different domain 10. Further, the storage unit 40 stores address information 41 and service line information 42 as in the terminal node 1 of FIG.

(Data Transfer Method of Embodiment 1)
Next, processing of the data transfer method according to the first embodiment will be described with reference to FIGS. 2 and 3 and FIG.

(Processing of first terminal node)
First, data is input from a node (symbol P) belonging to a network (first network) other than the multi-domain network 100 to a terminal node 1A (first terminal node) (see FIG. 1) in the multi-domain network 100. Then, the address recognition unit 221 (see FIG. 2) of the terminal node 1A recognizes the destination address “A” from the header of the service layer 101 of the input data. Then, the address changing unit 222 replaces the destination address of the data service layer 101 with the destination address “L” of the terminal node 1L (second terminal node) serving as the data outlet in the multi-domain network 100.

  Next, the header adding unit 232 of the first universal layer processing unit 230 uses the service line number (for example, the domain) for identifying the service user in the universal layer 102 based on the service line information 42 in the storage unit 40. The header including the service line number in 10X is set to “1”. With this process, the header of the service layer 101 is encapsulated.

  Subsequently, the header adding unit 242 of the transport layer processing unit 240 sets a transfer identifier (for example, “1” as the transfer identifier) necessary for transferring between the relay nodes 3 in the domain 10X (first domain). Add a header containing By this processing, the header of the universal layer 102 is further encapsulated. Here, a number corresponding to the data communication technology of each domain 10 is attached to the transfer identifier. For example, a time slot number corresponds to SDH, and an MPLS label or the like corresponds to a transfer identifier.

  Then, the data transfer unit 250 processes the header including the transfer identifier of the transport layer 103 attached to the data, thereby transferring the data to each relay node 3 of the domain 10X. At this time, since the headers of the universal layer 102 and the service layer 101 are encapsulated, they are not processed in the relay node 3 in the domain 10X.

(Processing of the first boundary node)
When the boundary node 2D (first boundary node) (refer to FIG. 1) of the domain 10X receives data from the relay node 3, the header deletion unit 243 of the transport layer processing unit 240 (refer to FIG. 3) transfers the data The header of the port layer 103 is deleted. Then, the line number recognizing unit 261 of the second universal layer processing unit 260 recognizes the service line number, and the line number changing unit 262 determines between the boundary nodes 2D-2E based on the service line information 42 in the storage unit 40. To the service user's service line number (for example, service line number “2”). Then, the data transfer unit 250 transfers data to the boundary node 2E of the domain 10Y. At this time, since the header of the service layer 101 is encapsulated, it is not processed in the boundary node 2D.

(Processing of second boundary node)
Processing of the boundary node 2 (second boundary node) belonging to another domain 10 (second domain) that has received data from the boundary node 2 in the domain 10 will be described. In FIG. 1, since the boundary node 2E of the domain 10Y and the boundary node 2I of the domain 10Z perform the same processing, the description will be made assuming that the boundary node 2I has received data.

  When the boundary node 2I (second boundary node) receives data from the boundary node 2H of the domain 10Y, the line number recognition unit 261 of the second universal layer processing unit 260 (see FIG. 3) recognizes the service line number. Then, the line number changing unit 262 changes the service line number (for example, service line number “5”) in the domain 10Z (second domain) based on the service line information 42 in the storage unit 40. Subsequently, the header adding unit 242 of the transport layer processing unit 240 adds a header including a transfer identifier (for example, transfer identifier “2”) necessary for transferring between the relay nodes 3 in the domain 10Z. By this processing, the header of the universal layer 102 is further encapsulated.

  Then, the data transfer unit 250 processes the header including the transfer identifier of the transport layer 103 attached to the data, thereby transferring the data to each relay node 3 of the domain 10Z. At this time, since the headers of the universal layer 102 and the service layer 101 are encapsulated, they are not processed in the relay node 3 in the domain 10X.

(Processing of second terminal node)
When the terminal node 1L (second terminal node) (see FIG. 1) of the domain Z receives data from the relay node 3, the header deleting unit 243 of the transport layer processing unit 240 (see FIG. 2) transmits the data The header of the port layer 103 is deleted. Next, the header deletion unit 233 of the first universal layer processing unit 230 deletes the header of the universal layer 102. Then, the address recognition unit 221 of the service layer processing unit 220 recognizes the destination address “L” from the header of the service layer 101. Then, the address changing unit 222 replaces the destination address of the data service layer 101 with the destination address of a node (symbol Q) belonging to a network (second network) other than the multi-domain network 100, and the data transfer unit 250 sets the data Forward.

  By doing so, in each boundary node 2 in the multi-domain network 100, the header of the service layer 101 is encapsulated, so that it is not necessary to process the service layer 101 in each boundary node 2. That is, it is possible to eliminate the need for the boundary node 2 to have a function of processing a header corresponding to each service accommodated in the multi-domain network 100.

(Embodiment 2)
Next, a data transfer method according to the second embodiment, which is a modification of the first embodiment, will be described. In the data transfer method according to the first embodiment, as illustrated in FIG. 1, the connection between the domains 10 is performed in the universal layer 102. In this case, the boundary node 2 of each domain 10 becomes a relay node in the universal layer 102 and performs data relay processing. In the data transfer method according to the second embodiment, the connection between the domains 10 is performed in the transport layer 103, and there is no relay node in the universal layer 102, and the processing of the universal layer 102 is performed up to the end of the multi-domain network 200. It is characterized by not performing.

  First, an outline of data communication in the multi-domain network 200 according to the second embodiment will be described with reference to FIG. FIG. 4 is a diagram illustrating a configuration example of the multi-domain network 200 according to the second embodiment. The configuration of the multi-domain network 200 shown in FIG. 4 is composed of a plurality of domains 10 (domains 10X, 10Y, and 10Z), similarly to the multi-domain network 100 shown in FIG. Each domain 10 includes a terminal node 1 in the multi-domain network 200, a boundary node 5 having a function different from that of the boundary node 2 in the first embodiment, a relay node 3, and a link 4.

  Compared with the multi-domain network 100 according to the first embodiment illustrated in FIG. 1, the multi-domain network 200 according to the second embodiment illustrated in FIG. 4 has (1) a service line number in the universal layer 102 for each domain 10. It is different in that it is set over the terminal node of the multi-domain network 200. Further, (2) the difference is that the boundary node connection layer 104 is set as a layer for controlling communication of the link 4 connecting the boundary nodes 5 of the domains 10.

  In other words, the boundary node 5D (see FIG. 4) of the domain 10X that has received data from the relay node 3 deletes the header of the transport layer 103, adds the header of the boundary node connection layer 104, and adds the boundary node 5E of the domain 10Y. Transfer data to At this time, since the header of the service layer 101 and the header of the universal layer 102 are encapsulated, they are not processed in the boundary node 5. Therefore, similarly to the first embodiment, each boundary node 5 can eliminate the need to have a function of processing a header corresponding to each service.

  Hereinafter, specific functions of the boundary node 5 configuring the multi-domain network 200 will be described, and then a data transfer method as the entire multi-domain network 200 will be described in detail. Note that the termination node 1 in the multi-domain network 200 has the same function as the termination node 1 in the first embodiment, and thus description thereof is omitted.

(Boundary node)
FIG. 5 is a functional block diagram illustrating a configuration example of the boundary node 5 according to the second embodiment (see FIG. 4 as appropriate). The difference from the boundary node 2 shown in FIG. 3 is that the second universal layer processing unit 260 is not provided in the layer processing unit 210 of the boundary node 5, while the boundary node connection layer processing unit 270 is provided. It is. In addition, the service line information 42 is not stored in the storage unit 40. A description of the same configuration as that of the boundary node 2 in FIG. 3 is omitted.

  The boundary node connection layer processing unit 270 (see FIG. 5) adds / deletes the header of the boundary node connection layer 104 to control the data transfer through the link 4 between the boundary nodes 5 to the universal layer 102 header. And includes a header recognition unit 271, a header addition unit 272, and a header deletion unit 273. The header recognition unit 271 recognizes the header of the boundary node connection layer 104. Then, the header adding unit 272 adds the header of the boundary node connection layer 104 to the header of the universal layer 102. By this processing, the header of the universal layer 102 is encapsulated. The header deletion unit 273 deletes the header of the boundary node connection layer 104 attached to the data received via the communication unit 30.

  As described above, the boundary node 5 according to the second embodiment encapsulates and transfers the headers of the service layer 101 and the universal layer 102 in the multi-domain network 200 by providing the boundary node connection layer processing unit 270. Can do.

(Data transfer method of Embodiment 2)
Next, processing of the data transfer method according to the second embodiment will be described with reference to FIGS. 2 and 5 and FIG.

(Processing of first terminal node)
First, when data is input from a node belonging to a network (first network) other than the multi-domain network 200 to a termination node 1A (first termination node) (see FIG. 4) in the multi-domain network 200, the termination is performed. The address changing unit 222 (see FIG. 2) of the node 1A changes the destination address of the service layer 101 to the destination address “L” of the terminal node 1L (second terminal node) serving as the data exit in the multi-domain network 200. .

  Next, the header adding unit 232 of the first universal layer processing unit 230 adds a header including a service line number (for example, service line number “1”) for identifying the service user in the universal layer 102. . In the first embodiment, the service line number is set for each domain 10, but in the second embodiment, a service line number common to the entire multi-domain network 200 is assigned. With this process, the header of the service layer 101 is encapsulated. Then, the header adding unit 232 of the transport layer processing unit 230 adds the header, so that the header of the universal layer 102 is further encapsulated and the data is transferred to the relay node 3.

(Processing of border nodes in the first domain)
When the boundary node 5D (see FIG. 4) of the domain 10X (first domain) receives data from the relay node 3, the header deletion unit 243 (see FIG. 5) of the transport layer processing unit 240 transports the data. The layer 103 header is deleted. Next, the header adding unit 272 of the boundary node connection layer processing unit 270 adds a header including transfer destination identification information (for example, identification number “6”). Then, the data transfer unit 250 transfers data to the boundary node 5E of the domain 10Y. At this time, since the header of the service layer 101 and the header of the universal layer 102 are encapsulated, they are not processed in the boundary node 5D.

(Processing of border nodes in the second domain)
Next, processing of the boundary node 5 of another domain 10 (second domain) that has received data from the boundary node 5 in the domain 10 will be described. In FIG. 4, since the boundary node 5E of the domain 10Y and the boundary node 5I of the domain 10Z perform the same processing, the description will be made assuming that the boundary node 5I has received data.

  When the boundary node 5I (see FIG. 4) receives data from the boundary node 5H of the domain 10Y, the header deletion unit 273 (see FIG. 5) of the boundary node connection layer processing unit 270 causes the boundary node connection layer 104 of the data to Remove the header. Next, the header adding unit 242 of the transport layer processing unit 240 adds a header including a transfer identifier (for example, transfer identifier “2”) for transferring the domain 10Z (second domain), and the data transfer unit 250 transfers the data to the relay node 3.

(Processing of second terminal node)
Similarly to the processing of the second terminal node according to the first embodiment, the terminal node 1L (second terminal node) (see FIG. 4) that has received the data from the relay node 3 receives the header of the transport layer 103 and The header of the universal layer 102 is deleted. Then, the address changing unit 222 of the service layer processing unit 230 replaces the destination address of the service layer 101 with the destination address of a node belonging to a network (second network) other than the multi-domain network 200, and the data transfer unit 250 Transfer data.

  Thus, according to the data transfer method according to the second embodiment, since the header of the service layer 101 is encapsulated in the boundary node 5 in the multi-domain network 200, each boundary node 5 There is no need to process the service layer 101. That is, it is possible to eliminate the need for the boundary node 5 to have a function of processing a header corresponding to each service accommodated in the multi-domain network 200. Moreover, since the header of the universal layer 102 is also encapsulated, the processing of the universal layer 102 in the boundary node 5 can be eliminated.

  As described above, according to the data transfer method, the termination node, and the boundary node according to the present embodiment, the header of the service layer 101 is encapsulated in the boundary node in the multi-domain network. There is no need to process the service layer 101.

  Furthermore, in the conventional multi-domain network, header processing is necessary for each layer of the service layer 101, the service line identification layer 105, and the transport layer 103 of each data at the boundary node. Processing of the header of the service layer 101 can be eliminated. Therefore, the calculation processing load of each boundary node can be reduced and the data transfer rate can be improved.

  In the conventional multi-domain network 900, since data transfer control is performed for each domain 10, path switching for transferring data is also performed for each domain 10. However, in the present embodiment, by introducing the universal layer 102 that spans a plurality of domains 10 in the multi-domain networks 100 and 200, the path switching across the domains 10 becomes possible.

DESCRIPTION OF SYMBOLS 1 End node 2, 5, 9 Boundary node 3 Relay node 4 Link 10 Domain 20 Control part 30 Communication part 31 1st interface 32 2nd interface 33 3rd interface 34 4th interface 40 Memory | storage part 41 Address information 42 Service line information 100, 200, 900 Multi-domain network 101 Service layer 102 Universal layer 103 Transport layer 104 Border node connection layer 105 Service line identification layer 210 Layer processing unit 220 Service layer processing unit 221 Address recognition unit 222 Address change unit 230 1 Universal layer processing unit 231 261 Line number recognition unit 232 242 272 Header addition unit 233 243 273 Header deletion unit 240 Transformer Toreiya processing unit 241 transfers the identifier recognition section 250 the data transfer unit 260 the second universal layer processing unit 262 line number change unit 270 boundary node connection layer processing unit 271 the header recognizer

Claims (5)

A data transfer method in a multi-domain network in which multiple domains are connected in a network,
The first terminal node that has received the data from the first network other than the multi-domain network is:
A storage unit storing service line information including a service line number for specifying a user of a communication service in the first domain, which is the domain including the first terminal node;
For the received data, the destination address of the header of the service layer for controlling data communication in the communication service provided by the network is the second network other than the multi-domain network among the nodes in the multi-domain network. Set to the destination address of the second terminal node connected to
A header of a universal layer that is a layer for transferring data in all domains in the multi-domain network is added to the data, and a service line number for specifying a service user in the first domain is added. , Setting based on the service line information stored in the storage unit,
Adding a transport layer header for transferring within the first domain to the data to which the universal layer header has been added;
Sending the data to a relay node in the first domain;
The boundary node in the first domain that has received the data from the relay node is
When transmitting the data to a second domain connected to the first domain,
A storage unit storing service line information including a service line number for identifying a user of the communication service in a link between the first domain and the second domain;
Delete the transport layer header of the data,
Changing the universal layer header to the service line number in the link between the first domain and the second domain, based on the service line information stored in the storage unit;
Sending the data to a border node in the second domain;
A border node in the second domain that has received the data from a border node in the first domain is:
A storage unit storing service line information including a service line number for identifying a user of the communication service in the second domain;
Changing the universal layer header of the data to the service line number in the second domain based on the service line information stored in the storage unit;
Adding a transport layer header for forwarding within the second domain;
Sending the data to a relay node in the second domain;
The second terminal node in the second domain that has received the data from the relay node is
The transport layer header and the universal layer header of the data are deleted, and the destination address of the service layer of the data is changed to the destination address of the node that is the transmission destination of the second network, and then transmitted. ,
A data transfer method in a multi-domain network. In a multi-domain network in which a plurality of domains are connected in the network, the terminal node is connected to a network other than the multi-domain network and transmits and receives data.
The termination node relates to a communication unit that receives the data from a first network other than the multi-domain network and transmits the data to a second network other than the multi-domain network, and a node to which the data is transferred A storage unit storing address information including a destination address and service line information including a service line number for specifying a user of the communication service; and
When the terminal node is a first terminal node connected to the first network and receiving the data,
For the received data, the destination address of the header of the service layer for controlling the data communication in the communication service provided by the network is set to a destination other than the multi-domain network by using the address information stored in the storage unit. Set the destination address of the second terminal node connected to the network of
A header of a universal layer that is a layer for transferring data in all domains in the multi-domain network is added to the received data, and the first domain that is the domain including the first terminal node is added. The service line number in is set based on the service line information stored in the storage unit,
Adding a transport layer header for transferring within the first domain to the data to which the universal layer header has been added;
Transmitting the data to the relay node in the first domain via the communication unit;
When the terminal node is a second terminal node connected to a second network,
Delete the transport layer header and the universal layer header added to the transmitted data;
Using the address information stored in the storage unit, the destination address of the header of the data service layer is changed to the destination address of a node that is a transmission destination of a second network other than the multi-domain network,
Transmitting the data to the second network via the communication unit;
A terminal node characterized by In a multi-domain network in which multiple domains are connected in a network, the boundary node performs transmission and reception of data between the domains,
The boundary node includes a communication unit that transmits and receives the data between the domains, service line information including address information regarding a node to which the data is transferred, and a service line number for identifying a user of the communication service. A storage unit stored therein,
A universal layer header that is a layer for transferring data in all domains in the multi-domain network is added to a service layer header for controlling data communication in a communication service provided by the network, and For the data with the transport layer header added for transfer within the domain,
When the boundary node is a first boundary node that receives the data from a relay node in a first domain to which the boundary node itself belongs,
Delete the transport layer header of the data,
Based on the service line information stored in the storage unit, the universal layer header is changed to the service line number in the link toward the second boundary node in the second domain connected to the boundary node. And
Sending the data to a second border node in the second domain;
If the border node is a second border node in the second domain that has received the data from a first border node in a first domain;
Changing the universal layer header to the service line number in the second domain based on the service line information stored in the storage unit;
Adding a transport layer header for forwarding within the second domain;
Transmitting the data to a relay node in the second domain;
Boundary node characterized by A data transfer method in a multi-domain network in which multiple domains are connected in a network,
The first terminal node that has received the data from the first network other than the multi-domain network is:
For the received data, the destination address of the header of the service layer for controlling data communication in the communication service provided by the network is the second network other than the multi-domain network among the nodes in the multi-domain network. Set to the destination address of the second terminal node connected to
A universal layer header, which is a layer for transferring data in all domains in the multi-domain network, is added to the data, and a service line number for specifying a service user in the multi-domain network is set. And
Adding a transport layer header for transferring within the first domain to the data to which the universal layer header has been added;
Sending the data to a relay node in the first domain;
The boundary node in the first domain that has received the data from the relay node is
When transmitting the data to a second domain connected to the first domain,
Delete the transport layer header of the data,
Adding a header of a boundary node connection layer that is a layer for controlling connection between the boundary node in the first domain and the boundary node in the second domain;
Sending the data to a border node in the second domain;
A border node in the second domain that has received the data from a border node in the first domain is:
Delete the border node connection layer header of the data;
Adding a transport layer header for forwarding within the second domain;
Sending the data to a relay node in the second domain;
The second terminal node in the second domain that has received the data from the relay node is
The transport layer header and the universal layer header of the data are deleted, and the destination address of the service layer of the data is changed to the destination address of the node that is the transmission destination of the second network, and then transmitted. ,
A data transfer method in a multi-domain network. In a multi-domain network in which multiple domains are connected in a network, the boundary node performs transmission and reception of data between the domains,
The boundary node includes a communication unit that transmits and receives the data between the domains, and a storage unit that stores address information regarding a node to which the data is transferred,
A universal layer header that is a layer for transferring data in all domains in the multi-domain network is added to a service layer header for controlling data communication in a communication service provided by the network, and For the data with the transport layer header added for transfer within the domain,
When the boundary node is a boundary node that receives the data from a relay node in a first domain to which the boundary node itself belongs,
Delete the transport layer header of the data,
Adding a header of a boundary node connection layer that is a layer for controlling communication between the boundary node in the first domain and the boundary node in the second domain connected to the boundary node;
Sending the data to a border node in the second domain;
If the border node is a border node in the second domain that has received the data from a border node in the first domain;
Delete the border node connection layer header of the data;
Adding a transport layer header for forwarding within the second domain;
Transmitting the data to a relay node in the second domain;
Boundary node characterized by

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