WO2004071033A1 - 光ネットワーク、光エッジルータ及びそのプログラム、カットスルー方法およびエッジルータ - Google Patents
光ネットワーク、光エッジルータ及びそのプログラム、カットスルー方法およびエッジルータ Download PDFInfo
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- WO2004071033A1 WO2004071033A1 PCT/JP2004/000981 JP2004000981W WO2004071033A1 WO 2004071033 A1 WO2004071033 A1 WO 2004071033A1 JP 2004000981 W JP2004000981 W JP 2004000981W WO 2004071033 A1 WO2004071033 A1 WO 2004071033A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/04—Interdomain routing, e.g. hierarchical routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/52—Multiprotocol routers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/54—Organization of routing tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/62—Wavelength based
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0066—Provisions for optical burst or packet networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0071—Provisions for the electrical-optical layer interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0088—Signalling aspects
Definitions
- the present invention relates to an optical network, an optical edge router, and a program configured by a plurality of routers and an optical cross-connect.
- the present invention also relates to a communication method of a core network connected by an optical or layer 2 path, and particularly to a cut-through method.
- the present invention also relates to an information transfer network system for performing overnight transfer, and a bucket switch and a packet / circuit switch for the information transfer system, and more particularly, establishes a transmission path for transferring data and realizes data transfer.
- an information transfer network system for performing overnight transfer
- a bucket switch and a packet / circuit switch for the information transfer system, and more particularly, establishes a transmission path for transferring data and realizes data transfer.
- the peer model (1) is a model that uses the IP address in the same address space as the external IP network connected to the optical network for optical path routing (path control) and signaling (call control).
- the feature is that devices such as connect are recognized as one node from the external IP network. Therefore, it is possible to easily realize a multi-layer coordination function from the external IP network side, such as specifying an optical path and establishing an optical path in cooperation with a routing protocol in the external IP network.
- the address in the same space as the external IP network is used for controlling the optical path. Therefore, it is difficult to accommodate multiple external IP networks in one optical network.
- the address space of the optical network and the address space of the external IP network accommodated in it are completely independent, and the external IP network side does not see any topology / address inside the optical network. Absent. Therefore, contrary to the peer model, it is difficult to provide a multi-layer coordination function, but it is characterized in that it is easy to accommodate multiple networks.
- routing information exchange between external IP networks is generally performed by passing a routing protocol through an established optical path ⁇ ]. It is necessary to establish and release a single-neighbor adjacency. A change in the routing adjacency is perceived by the external IP network as a network topology change, and is a factor that increases the instability of the external IP network.
- multiplexing the multiple IP networks on a single optical network is efficient in using network resources such as optical fibers. It is very important.
- realizing a multi-layer coordination function that autonomously controls the optical path in response to fluctuations in the IP network increases the operating cost for carriers. It leads to reduction.
- the realization of the multi-layer coordination function will frequently cause the establishment and release of optical paths, but from the viewpoint of network stability, changes in the topology of optical paths will affect the routing of external IP networks. It is desirable to have no effect.
- a new optical IP network model that satisfies these requirements is required.
- a conventional core network consisting of an optical path or a layer 2 path
- an optical path setting function such as GM PLS (see, for example, prior art document 3) is added to an existing IP router as a luggage router Take.
- the edge routers are connected via normal IP connection (one-night connection) via these paths.
- the optical path or layer 2 path must be connected to the core network. Need to establish a mesh in the network. Therefore, as the number of edge routers increases, the number of paths held by one edge router also increases, and the number of IP interfaces that edge routers must have also increases.
- IP interfaces As described above, the number of IP interfaces that edge routers need to maintain increases as the size of the core network increases, but IP interfaces are generally expensive because they perform complex IP processing such as searching for IP addresses. In addition, its complexity is a bottleneck for improving interface speed.
- the number of connections that can be established by each device is restricted because the optical path is realized by wavelength or logical connection of Layer 2.
- the number of wavelength division multiplexing of the WDM device is restricted. Since the communication speed per wavelength is determined by the IP interface speed of the edge router, many wavelengths are consumed unless the interface speed is improved, and the number of edge routers that can be accommodated in the core network due to the limitation of the number of wavelengths of WDM equipment Is limited, and cannot cope with the enlargement of the network.
- the core network architecture including the conventional optical path or the layer 2 path has a problem in terms of economy and scalability.
- FIG. 11 is a diagram illustrating a conventional data transfer network configuration.
- a circuit switch 3200 including a plurality of optical cross-connects is connected by a single or a plurality of communication lines 3300 to form a circuit switching network such as an optical network.
- a plurality of bucket exchanges 310, such as an IP network are connected to the circuit switch of this circuit switching network via a communication line 330, thereby forming a bucket switching network such as an IP network.
- the circuit switch 3200 is composed of a circuit switch and a circuit path control unit.
- the line switch is connected to a line switch of one or more other line switches via a plurality of communication lines.
- the line path control unit controls the line switch and connects the two communication lines.
- Communication lines correspond to, for example, optical lines, SDH / SONET lines, ATM lines, MPLS-LSP, FR lines, and so on.
- the circuit path control unit is connected to a circuit switch of one or more other circuit switches by a communication path 3700 between circuit switches.
- the line path control unit exchanges information such as the number of communication lines connecting the mutual line exchanges via the inter-line switch communication path. For example, by using communication protocols such as OSPF-TE (see Prior Art Document 4) and PNNI (see Prior Art Document 5), the connection relationship of the entire circuit switching network can be known.
- FIG. 12 is a diagram showing connection information of the circuit switching network.
- the bucket exchange 3100 includes a bucket switch, a line setting control unit, and a packet path control unit.
- the bucket switch is connected to one or more circuit switches 3200 by a communication line 3300.
- the line setting control unit is connected to one or more circuit switches 3200 and a bucket switch / communication line 3600 between circuit switches.
- the line setting control unit sends a line setting control message to the line exchange 3200.
- the circuit switch 3200 selects the necessary free communication line for connecting between the two bucket switches based on the connection relation information of the entire circuit switching network in the circuit switching network. I do. For example, from the connection-related information, between the packet switch 3100-1 and the bucket switch 3100-2, the communication lines 3300-1-1, 2, 3300-2-1, 3300-5-1, and 3300-4-1 are free lines.
- the communication lines between the bucket exchange 3100-1 and the bucket exchange 3100-2 can be connected by connecting these communication lines with the circuit switches 3200-1, 2, and 3. Is determined, and based on the result of the determination, the line setting control message is transferred to the other circuit switch. By repeating this, communication lines are set up between the packet switches, and packetized data exchange becomes possible.
- the bucket path control unit inserts the packet path information message into the communication line 3300 by the bucket input / extraction circuit.
- the inserted packet path information message is transferred to one or more other bucket path control units via the communication line. By exchanging this message, it becomes possible to mutually obtain connection relation information of the bucket communication network.
- FIG. 13 is a diagram showing route information of the packet switching network. This route information Thus, the bucket transfer path can be determined.
- a packet switching network is equivalent to an IP packet network, etc., and uses a 0 SPF (refer to prior art document 6), an IS-IS (refer to prior art document 7) protocol, and the like, so that a packet network connection relationship and packet transfer are performed. It is possible to make a route decision. For example, it is determined that a packet addressed to the packet switch 100-3 from the packet switch 100_1 is transferred to the communication line 300-1-1.
- FIG. 14 is a diagram illustrating a conventional data transfer network configuration.
- the plurality of circuit switches 3200 are connected by one or more communication lines 3300 to form a circuit switching network.
- a plurality of bucket exchanges 3100 are connected to the circuit exchange of the circuit exchange network via the communication line 3300, thereby forming a packet exchange network.
- the circuit switch 320 is composed of a circuit switch and a circuit / packet route control unit.
- the line switch is connected to a line switch of one or more other line switches via a plurality of communication lines.
- the line and bucket path control unit controls the line switch and connects the two communication lines.
- the communication line corresponds to, for example, an optical line, a SDHZONET line, an ATM line, an MPLS-LSP, an FR line, and the like.
- the line / packet path control unit is connected to a line switch of one or more other line switches and a communication path 3700 between the line switches.
- the bucket switch 3100 is composed of a bucket switch and a line / bucket path control unit.
- the packet switch is connected to one or more circuit switches 320 and a communication line 330.
- the line 'bucket setting control unit' is connected by one or a plurality of line switches 3200 and a bucket switch Z communication line 3600 between Z line switches.
- the line / packet path control unit exchanges information such as the number of communication lines connecting the mutual circuit exchanges via the inter-exchange communication path 3700 and exchanges the packet path information message.
- connection information of the bucket communication network For example, OSPF—TE (see Prior Art Document 4) and PNNI (prior art)
- OSPF—TE see Prior Art Document 4
- PNNI prior art
- Figure 15 shows the integrated connection information of the circuit switching network and the packet switching network. Based on this information, the optimal packet transfer route can be determined.
- the line's packet route control unit uses the line network information and the packet network information.
- the communication lines 3300—1-2, 3300—2-1—3 300—5-1, and 3300—4-1 are circuit exchanges.
- the communication line between the packet switch 3100-1 and the bucket switch 3100-2 is connectable, and based on the determination result, Transfer the line setting control message to the other line switch.
- a communication line is set up between the packet switches, and packetized data exchange becomes possible.
- connection information of the circuit switching network and the connection information of the packet switching network are independent.
- the packet exchange cannot utilize the information of the circuit exchange network to optimally arrange communication lines between the bucket exchanges.
- connection information of the circuit switching network and the connection information of the packet switching network are shared, so that the packet switch uses the information of the circuit switching network to transmit the communication lines between the packet switches. It is possible to optimize the allocation of packets, for example, by transferring a packet addressed to the packet exchange 3100-1 to 3100-13 to the communication path 3600-1 and a bucket transfer network. The separation of the switching control network was a problem.
- Generalized ulti-Protocol Label Switching "Generalized Mmti-Protocol Label Switching Architecture", IETF Internet-Draft, [online], published in May 2003, [2003 Monthly Search], In-Yuichi Net ⁇ URL HYPERLINK "httpV / www.i etf.org//internet-drafts/draft-ietf-ccarap-gmpls-architecture-07.txt "http7 / ww wietf.org//internet-drafts/draft-ietf-ccamp-gmpls-architecture-07.txt Prior art Reference 2
- an object of the present invention is to provide an optical network or the like that can realize a multi-layer cooperation function and has high network stability.
- optical network system includes optical path establishing means, and includes a plurality of optical networks connecting an external IP network to the optical network, and an optical path connecting the optical network between the optical networks.
- optical network composed of a plurality of optical cross-connect devices each provided with a switching unit.
- the optical edge router comprises: (1) an optical network control instance that holds topology information in the optical network, performs routing and signaling of optical paths, and (2) ) Maintain the routing table of the external IP network and provide both IP network instances that operate the routing protocol with the external IP network.
- Optical path establishment means has a function of establishing an optical signal path.
- RSVP-TE of GMPLS corresponds to an optical path establishment unit.
- An “optical edge router” is a router that has the function of connecting an external IP network to an optical network. Specifically, this function associates an IP packet (destination IP address) to be processed with an optical path, and relays the IP packet to an appropriate optical path.
- the “optical cross-connect device (optical core router)” is a device that switches the optical signal path (optical path) by switching optical signals.
- An “optical path” is a path of an optical signal generally set in wavelength units, but in the present invention, it includes a TDM (Synchronous Optical NETwork / Synchronous Digital Hierarchy) (SODM / SDH) channel and the like. I have. Incidentally, in the GMPLS protocol described above, the wavelength and the TDM channel can be handled similarly.
- TDM Serial Optical NETwork / Synchronous Digital Hierarchy
- SODM / SDH Synchronous Digital Hierarchy
- Topic information in an optical network refers to, for example, the configuration of an optical network. Information about what interface each device has and what address is assigned to it.
- “Signaling” refers to identifying the other party, monitoring the status of each other, and exchanging requests.
- “Sidana ring protocol” is the protocol used for such exchanges.
- the address space of the external IP network and the address space used for optical network control are completely separated, and a single optical network can accommodate a plurality of IP networks.
- one optical edge router since one optical edge router has both of these instances, autonomous optical path control using information on the external IP network, that is, multi-layer coordination becomes possible.
- An instance is data as an actual value based on a class in object-oriented programming. Often used in contrast to classes, classes are described as "types” and instances as “r entities”.
- the optical network system of the present invention is characterized in that, in the optical network, a routing protocol for exchanging routing information between external IP networks is used for an optical edge router to which the external IP network is connected. This is to operate during the optical network control distance.
- the routing adjacency for exchanging the routing information of the external IP network always appears to be established during the optical edge period.
- This routing adjacency is completely unaffected by changes in the topology of the optical path, so that the topology always appears to be stable from the external network.
- a feature of the optical network system of the present invention is that in the optical network system, BGP (Border Gateway Protocol) is used as a protocol for exchanging route information of an external IP network.
- BGP Border Gateway Protocol
- BGP is a protocol for exchanging IP routing information between different networks, but in an embodiment described later, BGP is used as it is for exchanging routing information between optical edge routes.
- the present invention is an optical router for transferring a packet to and from an external IP network.
- This optical edge router includes a bucket transfer processing means for transferring a bucket with an adjacent router of the external IP network, and performs a process of exchanging route information with the adjacent router.
- Routing information exchange means routing table creation means for creating a routing table and storing it in the storage means, topology information collection means for collecting topology information in the optical network and storing the information in the storage means, Signaling means for signaling the establishment and release of an optical path; path information notifying means for notifying the path information to another opposing optical edge router; and the routing table and the topology information.
- a packet transfer table which is read from the storage means and sets a packet transfer destination in the bucket transfer processing means.
- a bucket transfer table generation processing means for performing a process of generating the data.
- the packet transfer processing means corresponds to a transfer processing unit
- the route information exchange means corresponds to an IP network routing protocol processing unit
- the routing table creating means for creating a routing table is an IP network routing.
- the storage means for storing this routing table corresponds to the IP network routing table storage section
- the topology information collection means corresponds to the OSPF-TE processing section
- the signaling means corresponds to the RSVP-TE processing section.
- the route information notifying means corresponds to a BGP processing unit
- the storage means for storing topology information corresponds to an optical network topology DB.
- the invention of the present application is used in an optical edge router, which is used in an optical network and includes an arithmetic processing means for performing a predetermined arithmetic processing and a bucket transfer processing means for transferring a bucket between an external IP network.
- Program This program is executed by arithmetic processing means corresponding to a protocol processing unit of an embodiment to be described later.
- the processing arithmetic processing means includes a routing information exchange function, a routing table creation function, a topology information collecting function, a signaling function, and a routing information. Operate as notification function and packet transfer table generation processing function. It is another object of the present invention to provide a cut-through method and an edge-routing method that can achieve economy of the edge-routing and improve scalability by partially omitting the IP processing at the edge of the edge.
- the present invention is a cut-through method in which a plurality of edge lines interconnecting one core network and a plurality of external IP networks at their boundary points directly communicate with each other inside the core network.
- the feature of the present invention is that the input edge router previously holds a correspondence table between the destination IP address and the corresponding identifier indicating the output interface of the output edge router, and stores the input table at the time of IP packet transfer.
- the identifier corresponding to the destination IP address is assigned to the IP packet, and the IP bucket is transferred to the output interface by referring to the identifier assigned to the IP packet in the output edge router. .
- the IP address search which was conventionally performed at the edge routers at both ends of the core network, is performed only at the external IP network side interface at the input edge network. It is possible to omit complicated IP processing in the network-side interface and to limit it to only simpler identifier reference processing. This makes it possible to reduce the cost of the interface on the core network side of the edge router. Furthermore, since the interface speed can be expected to be higher due to the simplification of processing, the number of paths in the core network can be reduced by increasing the speed per path, and scalability can be improved.
- the IP functions that support the existing MPLS such as a table for managing the MPLS label (MPLS label table) and encapsulation hardware for adding or removing the MPLS label to or from the IP bucket are provided. It can be diverted and the development cost can be reduced.
- the edge routers exchange correspondence information between the destination IP address and the identifier corresponding to the destination IP address by a control signal.
- information necessary for generating a correspondence table between a destination IP address and the identifier is automatically generated in an edge route.
- the present invention provides an input unit that connects one core network and a plurality of external IP networks to each other at a boundary point thereof, and that processes input IP packets from the external IP network to the core network;
- This is an edge router including an output means for processing an output IP packet to the external IP network.
- the input means includes: means for holding a correspondence table between a destination IP address and an identifier indicating an output interface corresponding to the other IP address; Means for assigning the identifier corresponding to the destination IP address of the IP bucket to the IP bucket based on the correspondence table at the time of bucket transfer, and the output means refers to the identifier and indicates an output interface indicated by the identifier There is a means to transfer the IP bucket to According to the present invention, it is possible to realize an edge router device for performing a cut-through method in which a destination IP address search is performed only at an input edge router and an output interface is determined only at a simple identifier search process at an output edge router. .
- an MPLS label As the identifier.
- an element function of an IP router that supports an existing MPLS such as a table for managing an MPLS label (MPLS label table) and a hardware for adding or removing an MPLS label to or from an IP packet, is used. It is possible to reduce development costs.
- the present invention installs in an information processing apparatus, An input function of interconnecting one core network and a plurality of external IP networks at their boundary points, and processing input IP packets from the external IP network to the core network; and an input function for processing the external IP from the core network.
- Output to network This is a program that implements a function corresponding to an edge router that has an output function to process IP packets.
- the features of the present invention include, as the input function, a function of maintaining a correspondence table between a destination IP address and an identifier indicating an outgoing or incoming interface of another interface, and a function of another edge router.
- the function is to realize the function of transferring the IP bucket to the output interface indicated by the identifier. It is desirable to use an MPLS label as the identifier.
- the present invention is a recording medium readable by the information processing device, on which the program of the present invention is recorded. Since the program of the present invention is recorded on the recording medium of the present invention, the information processing apparatus can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed directly on the information processing apparatus from a server holding the program of the present invention via a network.
- the circuit switch in an information transfer network system having a plurality of circuit switches and a plurality of bucket switches connected by a communication line, the circuit switch includes a circuit switch and a circuit path control unit, and the circuit switch comprises: To the circuit switch A packet switch connected to the circuit switch, having a function of connecting any connected communication lines, including a packet switch, a circuit path control unit, a packet path control unit, and a cooperation control unit; The packet switch has a function of selecting and outputting a communication line to be transferred based on the destination information of the bucket transmitted by the communication line, and the line path control unit of the circuit switch uses the communication path between the circuit switches for other lines.
- the line path control unit of the bucket switch is connected to the line path control unit of the switchboard, and the line path control unit of the bucket switch is connected to the line path control unit of one or more circuit switches by a packet switch line-to-line switch communication path.
- the circuit path control unit of the bucket exchange and the circuit path control unit of the bucket exchange exchange communication network connection information to thereby establish a communication network.
- the packet route control unit has a function of grasping the line connection status.
- the packet route control unit exchanges packet route information via a communication line with a packet switch connected by a communication line, thereby establishing a packet switching connection. It has a function of grasping related information and determining a communication line to be output based on packet destination information.
- the cooperation control unit has a function of receiving an instruction of a new communication line, and has an instruction of a new communication line.
- the connection selection of the circuit switching network collected by the circuit path control unit and the connection information of the bucket exchange collected by the bucket path control unit are referred to, and the path selection of the new communication line is performed.
- Instructing the line path control unit to set a new communication line, and the line path control unit transmits a connection line setting control message so as to set the line according to the specified path.
- the circuit switch that sends out the connection line setting control message to the switch and sets up the communication line, and also has the function to transmit the message according to the specified route, so that the communication line between the bucket switches can be set.
- Information transfer network system is a function of receiving an instruction of a new communication line, and has an instruction of a new communication line.
- a packet switch and a circuit switch integrated with a packet switch and a circuit switch are mixed, and a communication line can be set between the packet switch and the packet switch.
- This is an information transfer network system.
- the present invention relates to a bucket switch in an information transfer network system having a plurality of circuit switches and a plurality of packet switches connected by a communication line, wherein the packet is transferred based on destination information of the bucket transmitted by the communication line.
- Select a communication line A bucket switch having an output function, and a circuit of a communication network connected by a circuit path control unit of one or more circuit switches and a communication path between the bucket switches and the circuit switches, and exchanging connection information of the communication lines.
- It has a packet path control unit that has a function to determine which communication line to output based on packet destination information and a function to receive a new communication line instruction.
- a link control unit that performs route selection of a new communication line, and instructs the line route control unit on a setting route of the new communication line, and wherein the line route control unit determines a route designated by the cooperation control unit. Accordingly, a connection line setting control message is sent to the circuit switch to set the line, and the circuit switch receiving the connection line setting control message sets the communication line based on the connection line setting control message, and instructs the route to be instructed.
- This is a packet switch that can send messages in accordance with, and set up communication lines between bucket switches.
- the present invention relates to a bucket circuit switch in an information transfer network system having a plurality of circuit switches connected by communication lines, a plurality of bucket switches, and a bucket circuit switch, wherein the bucket is connected to the circuit switch.
- a line switch having a function of connecting arbitrary communication lines, and a packet switch having a function of selecting and outputting a communication line to be transferred based on the destination information of a bucket transmitted by the communication line.
- a circuit path control unit connected to the circuit path control unit of one or more circuit switches and a communication path between the circuit switches, and having a function of grasping the line connection status of the communication network by exchanging communication line connection information. Exchanges bucket route information via a communication line with a packet exchange connected to the communication line via a communication line.
- the 'It has a bucket path control unit that has a function to determine the communication line to be output based on the packet connection information based on the connection connection information of the exchange and a function to receive the instruction of the new communication line.
- the connection information of the circuit switching network collected by the circuit path control unit, and the bucket collected by the bucket path control unit A link control unit for selecting a new communication line by referring to two pieces of exchange connection information, and instructing the line route control unit to set a new communication line setting route.
- FIG. 1 is a diagram showing the overall configuration of an optical network including an external IP network in the present embodiment.
- FIG. 2 is a diagram showing an adjacent relationship between the instances and routings held by each node of the optical network in FIG.
- FIG. 3 is a diagram illustrating an example of an IP network routing table according to the present embodiment.
- FIG. 4 is a functional block diagram showing a more specific configuration of the light edge router in the present embodiment.
- FIG. 5 is a functional block diagram showing a more specific configuration of the optical cross-connect in the present embodiment.
- FIG. 6 is a sequence diagram showing an example of the flow of the route information in the present embodiment.
- FIG. 7 is a diagram illustrating an outline of an optical network.
- FIG. 8 is a diagram illustrating details of the optical cut-through processing.
- FIG. 9 is a diagram for explaining the MPLS label table.
- FIG. 10 is a diagram illustrating a configuration of an edge router that realizes optical cut-through.
- FIG. 11 is a diagram for explaining a conventional data transfer network configuration (part 1).
- FIG. 12 is a diagram showing connection information of the circuit-switched network of FIG.
- FIG. 13 is a diagram showing path information of the packet switching network of FIG.
- FIG. 14 is a diagram for explaining a conventional data transfer network configuration (part 2).
- FIG. 15 is a diagram showing integrated connection information of the circuit switching network and the bucket switching network of FIG.
- FIG. 16 is a diagram illustrating a data transfer network configuration according to the third embodiment of this invention.
- FIG. 17 is a diagram showing connection information of the circuit switching network of FIG.
- FIG. 18 is a diagram showing route information of the bucket switching network of FIG.
- FIG. 19 is a diagram for explaining a fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing an entire configuration of an optical network including an external IP network.
- the optical network 1001 has two external IP networks 1002 A and 1002 B as external IP networks 1002, for a total of four sites (1002A1, 1002A2, 1002 B1, 1002 B 2) Contained.
- the external IP network 1002 A and the external IP network 1002 B are accommodated in the optical network 1001 via the optical edge router 1003, and an optical cross-connect (optical cross-connect device) is connected between the optical edge routers 1003.
- An optical path 1005 is established through 1004 (1004a, 1004b--).
- a BGP peer 1006 is established between the optical edge routers 1003 to exchange route information of the external IP network.
- GM PLS will be used as the optical path control protocol in the optical network.
- the GMP LS used in the present embodiment is a technology for routing signals on the optical IP network 1001, but in the conventional MPLS (Multi-Protocol Label Switching), a label is added to a bucket for routing. While the route was specified, GMPLS determined the routing route based on the wavelength of the optical signal, or prepared a dedicated IP channel for control and routed the actual data as an optical signal.
- MPLS Multi-Protocol Label Switching
- the peer 1006 is established between the optical edge routers 1003 and exchanges information using a protocol called BGP.
- This BGP is a one-to-one protocol.
- the BGP peer 1006 can be established by, for example, (1) establishing a connection by a three-way handshake by TCP, (2) transmitting an OPEN message, (3) KE EPAL I VE message is returned, and so on.
- the routing table (see Figure 3 below) is exchanged, route information is updated by UPDA TE messages, periodic KEEP ALI VE messages are exchanged, and An exchange takes place.
- the code of the external IP network 2 is simply denoted by reference numeral 1002 when it is described in a high-level concept, and when it is specifically described individually, reference numerals 1002A and 1002B are used. Further, reference numerals 1 002 A 1, 1 002 A 2, 1 002 B 1 and 1 002 B 2 are used. The same applies to the optical edge router 3 and the like, and the symbol 1003 is simply used when describing the general concept, and the symbol 1003A1 003B and the symbol 1003A1 , 1003 A2, 1003 B1 and 1003 B2.
- the sign INS is used when describing the concept in a high-level concept, and the sign INSi or INSp is used when describing it individually and concretely.
- the description of other codes shall conform to the codes 1002, 1003, and the like.
- FIG. 2 is a diagram showing the adjacency between instances and routings held by each node of the optical network in FIG.
- the optical network 1001 1 shown in FIG. 2 is the same as that shown in FIG. 1.-The external IP network 1002 A and the external IP network 1002 B A total of four sites (1002 Al, 1002A2, 1002 B1, 1002 B 2) are accommodated in each of the two sites.
- Each external IP network 1002 (1002A1, 1002A2, 1002B1, 1002B2) is connected via the optical edge line 1003 (1003A1, 1003A2, 1003B1, 1003B2). Ne The network is housed in 10 1 1.
- the optical edge router 1003 is connected through the optical cross connect 1004 (1004 a, 1004 b--).
- the external IP network is composed of a normal IP router R (referred to as “adjacent IP router R” as appropriate).
- each node optical edge router 1003, optical cross-connect 1004
- One optical edge router 1003 has both an optical network control instance I NSp and an IP network instance I NS i.
- the optical network control instance INS ⁇ operates a routing protocol and a signaling protocol for controlling the optical path 1005 in the optical network 1001, and the topology information inside the optical network 1 obtained by them. Hold.
- OSPF—TE Open Shortest Path First-TE
- RS VP—TE Resource reSerVation Protocol-TE
- OSPF-TE uses route selection.
- RSVP—TE is a protocol for establishing a label path along a specified route, and is currently being extended so that an optical path 1005 (see Fig. 1) can also be established.
- the IP network instance INSi exchanges external IP network route information with the external IP network 1002, and as shown in FIG. 3, a routing table of the external IP network 1002 (hereinafter referred to as “IP network Ching table ”).
- the IP network routing table stores information such as a destination IP address prefix (Destination network address), a buttress mask (Address mask), and a next hop (Next nop), as shown in FIG.
- the routing table is initialized, and the routing table is updated due to a change in topology, a change in the route due to a router failure, etc.
- 03 and the IP network routing table are the same as general routers and routing tables.
- FIG. 4 is a functional block diagram showing a more specific configuration of the optical edge router in the present embodiment.
- the optical edge router 1003 (1003A1, 1003A2, 1003B1, 1003B2) in the present embodiment will be described with reference to FIG.
- the optical edge router 1003 is configured to include a protocol processing unit (arithmetic processing unit) 1031 that performs processing by software and a transfer processing unit 1032 that performs processing by hardware.
- the protocol processing unit 1031 has the above-described IP network instance I NSi and the above-described optical network control instance I NSp.
- IP Network Instance I NSi is an IP network routing protocol that runs a routing protocol that exchanges external IP network routing information with the neighboring node (normal IP router R) of the external IP network 1002.
- a processing unit 1311, and an IP network routing table storage unit 1312 that stores an IP network routing table (see FIG. 3) generated by the routing protocol are provided.
- the IP network routing table includes a process in which the IP network routing protocol processing unit 1311 writes the route information received from the external IP network 1002, and a process in which the external IP network route information storage unit 1314 writes the route information stored therein. Generated by either of the above processes.
- the IP network route information on the external IP network 1002 side (reference numeral 1002 A1 side) is received by the IP network routing protocol processing unit 1311. Is written to the external IP network route information storage unit 1314.
- the IP network route information of the other site (reference numeral 1002 A2 side) is Yes) It is received by the BGP processing unit 13 17 from the optical edge router 1003 (3 A2) via the BGP peer 1006, and written into the external network route information storage unit 1 3 14.
- OSPFGPBGP OSPFGPBGP or the like can be used as the routing protocol.
- An SPF—TE processing unit 13 15 and an RS VP—TE processing unit 13 16 for signaling the establishment and release of the optical path 1005 are provided. The operation of these two processing units 1315 and 1316 follows the standard operation specified by GMPLS.
- the optical network control instance I NSp notifies the other opposing optical edge router 1003 of the external IP network routing information (the same content as the routing information of the above-described IP network routing table) to the BGP processing unit 1. 3 1 7 is provided.
- the BGP processing unit 13 17 also has a function of receiving the notification in the opposite direction, that is, the external IP network route information notified from the other opposing optical router 1003.
- Reference numeral 1313 denotes an optical network topology DB that stores the topology information collected by the OS PF-TE processing unit 1315.
- the optical network topology DB 13 13 also stores and reads information from and to the RS VP-TE processing unit 1316.
- Reference numeral 1314 denotes an external IP network route information storage unit that stores external IP network route information.
- the protocol processing unit 1031 includes the IP network routing table stored in the IP network routing table storage unit 1312 and the optical network 100 stored in the optical network topology DB 3 13.
- a bucket transfer table generation processor 1318 for creating a packet transfer table for setting how to transfer a received IP packet based on the topology information of No. 1 is provided.
- the transfer processing unit 1032 includes a packet transfer processing unit 1321a, 1321b, a packet transfer table storage unit 1322, and a packet switch 1323.
- processing of converting an IP packet of an electrical signal into an IP packet of an optical signal and conversely, processing of converting an IP packet of an optical signal into an IP packet of an electrical signal, The route of the packet is switched by the packet switch 1 3 2 3 and the transfer process is performed.
- the transfer processing unit 103 is built in an interface card (also called a line card).
- This interface card is composed of an optical line (optical fiber), an optical signal terminal (optical signal—electrical signal), and a packet transfer processor. 1 3 2 1 (hop determination by 1P address search) 1 packet switch 1 3
- the connection configuration is as follows. At present, optical fiber is the main line, so the signal output to the external IP network 1002 is also an IP packet as an optical signal (converted to an electrical signal in the subsequent stage).
- the bucket transfer processing section 1321a and the packet transfer processing section 10332b have the same configuration, and the bucket transfer processing section 1321a of the external IP network 1002 side and the external A conversion unit (not shown) that converts an optical signal and an electric signal into and out of the network exists between the network 1002.
- the IP network routing table has information as shown in FIG. 3 corresponding to the type of the routing protocol operating with the adjacent IP router R on the external IP network 102 side.
- the packet transfer table holds simplified information that can be recognized by hardware.
- the optical cross-connect 104 holds only the optical network control instance IN Sp and does not have the IP network instance INSi. Therefore, the optical cross-connect 104 does not exchange any route information (external IP network route information) with the external IP network 2 and only controls the optical network 1001.
- FIG. 5 is a functional block diagram showing a more specific configuration of the optical cross connect in the present embodiment. Referring to FIG. 5, the optical cross connector according to the present embodiment is described. G 1004 (1004 a, 1004 b-).
- the optical cross-connect 1004 includes a protocol processing unit 1041 and a transfer processing unit 1042, like the optical edge router 1003 (see FIG. 4).
- the protocol processing unit 1041 includes an optical network control instance I NSp.
- the transfer processing unit 1042 includes optical interfaces 1421a and 1421, an optical table storage unit 1422, and an optical switch 1423. With the configuration of the transfer processing unit 1042, switching control of the optical path 1005 is performed.
- the optical path table stored in the optical path table storage unit 1422 holds the correspondence relationship between the ingress port number and the egress port number set by RS VP-TE signaling when the optical path is established, and Switch 1423 sets the line (optical path 1005) according to this correspondence.
- a normal IP routing connection 1008 such as OSPF or BGP is established between the optical edge router 1003 and the neighboring IP router R of the external IP network 1002, and the exchange of routing information (external IP network routing information) is performed.
- the optical edge router 1003 A1 receives the route information of the external IP network 1002 A1 from the external IP network 1002 A1 and accommodates another site (the external IP network 1002 A2). Advertise the route information received from Hikari Kaeda 1003 A2 to the external IP network 1002 A 1 side.
- BGP peers 1006 are established between the optical edge routers 1003 so that each optical edge router 1003 exchanges external IP network route information received from the external IP network 1012.
- the BGP peer 1006 is established between the optical network control instances INSp of each optical fiber 1003, and the external IP network route information exchanged is that of the external IP network 2. ---That is, each optical edge router 1003 passes the external IP network route information of the external IP network 1002 held in the IP network instance INS i to the optical network control instance INSp side (notification ), And advertise to opposing optical edge data 1003 through BGP peer 1006.
- the BGP peer 1006 is established only between the optical edge routers 1003 accommodating the sites belonging to the same external IP network 1002.
- the external IP networks 1002A1 and 1002A2 are the same, and the external IP networks 1002B1 and 1002B2 are the same. is there.
- the optical network control instance INSp establishes a GMPLS adjacency 1007 with an adjacent node in the optical network 1001. Specifically, an adjacency between OS PF-TE, which is a routing protocol of GMPLS, is established, and topology information in the optical network 1001 is exchanged. When the optical path 1005 is established and released, the message of the RS VP-TE signaling is carried via the adjacency between the optical network control instances INSp.
- the GMPL S adjacency 1007 connects all the optical network control instances I NSp in the optical network 1001 (to each other), while exchanging the external IP network route information of the external IP network 1002
- a BGP peer 1006 is not established between IP network instances INS i that accommodate different external IP networks 1002. Therefore, the optical network control instance I NSp is shared by all the accommodated external IP networks 1002, but the IP network instance I NSi is independent for each external IP network 1002.
- the external IP network 1 The optical edge router 1003 A 1 that accommodates 002 A establishes a BGP peer 1006 with the optical edge router 1003 A 2, but the optical edge router 1003 B 1 that accommodates the external IP network 1002 B No BGP peer 1006 is established with the same 1003 B2.
- one optical edge router 1003 exchanges the optical network control instance I NSp for controlling the optical path 1005 with the external IP network route information of the external IP network 1002.
- a plurality of external IP networks 1002 can be accommodated with high stability, a multi-layer coordination function can be realized, and easily.
- multi-layer coordination it is possible to establish and release an autonomous optical path 1005 linked to the external IP network 1002, and to efficiently and efficiently use optical resources such as wavelength-to-optical fiber. Can be used.
- network costs can be reduced and low-cost, large-capacity IP services can be provided to users.
- FIG. 6 is a sequence diagram showing an example of the flow of the route information (external IP network route information).
- An example of the flow of the external IP network route information (the external IP network 1002A1 ⁇ the optical network 1001 ⁇ the external IP network 1002A2) in this embodiment will be described with reference to this sequence diagram and FIG. I do.
- the optical edge router 1003 A1 of the optical network 100 1 is connected to the external IP network 1 by the routing protocol operating on the IP network instance I NS i of the optical edge router 1003 A 1.
- the external IP network route information (step S101) sent from 002A1 is received.
- the optical edge router 1003A1 notifies the received external IP network path information to the optical network control instance INSp inside the server 1003A1 (step S10112).
- the optical network control instance I NSp notified of the external IP network route information transmits the opposing (adjacent) optical edge router 1003 A2 via the BGP peer 1006, that is, the external IP network 1002 A 2 to the optical network 100
- the external IP network route information is advertised to the optical edge router 3 A2 connected to 1 (step S101).
- the external IP network route information from the neighboring IP router R is [IP Processing and transfer in the order of the network communication protocol processing unit 131 1) ⁇ [IP network routing table storage unit 1312] ⁇ [external IP network routing information storage unit 13 14] ⁇ [: 60? Processing unit 1317] Is advertised to the opposing optical edge router 1003 via the BGP peer 1006.
- the optical edge router 1003A2 which receives the external IP network route information advertised via the BGP peer 1006, internally transmits the received external IP network route information from the optical network control instance I NSp to the IP network instance I. Notify NS i (step S 1014).
- This external IP network route information is advertised to the external IP network 1002 A2 by the routing protocol running on the IP network instance INSi (step S1015).
- the external IP network 1002 may be another optical network. Further, as long as the optical network 1001 is connected to another external IP network 1002 by the optical edge router 1003, the internal configuration of the optical network 1001 does not matter. For example, the optical cross-connect 1004 is not narrowly interpreted.
- FIGS. Fig. 7 is a diagram illustrating the outline of the optical network.
- FIG. 8 is a diagram for explaining the details of the optical cutting process.
- FIG. 9 is a diagram for explaining the MPLS label table.
- FIG. 10 is a diagram illustrating the configuration of an edge-routing device for realizing optical cut-through.
- an optical network 2001 as one core network and a plurality of external IP networks 2002 are connected to each other at their boundary points, and as shown in FIG.
- the feature of the present embodiment is that the IPZMPLS interface 2017 holds IP PZMPLS forwarding that holds a correspondence table between a destination IP address and an identifier indicating a corresponding output interface of another edge line.
- a packet transfer process for adding the identifier corresponding to the destination IP address of the IP packet to the IP packet based on the IP packet transfer table 20 19 and the IP packet transfer table 20 19 to another edge router based on the IPZMPL S forwarding table 20 19
- the MPLS interface 2020 includes an MPLS transfer processing unit 2021 and an MPLS forwarding table 2022 for referring to the identifier and transferring the IP packet to an output interface indicated by the identifier. .
- the MPLS label is used as the identifier.
- the correspondence table is generated or updated based on the correspondence information acquired by the signal processing unit 2011.
- the MPLS label is applied as an identifier indicating the output interface of the output edge router, and the destination IP address and the MPLS label value are automatically exchanged between the edge routers by a control signal.
- the core network is assumed to be an optical network that directly connects Etzil overnight by an optical path.
- the optical network 2001 is a network composed of OXC (Optical Cross Connect) 2003, WDM, etc., and a plurality of edge routers 2004 located at the boundary with the external IP network 2002. Direct IP communication via 5 is possible. Also, a control signal 2006 for exchanging the destination IP address and the corresponding MPLS label value flows between the edge routers 2004.
- the ETSURU is composed of a control signal processing unit 2011 and a transfer processing unit 2012.
- the control signal processing unit 201 1 exchanges the destination IP address and MP LS between the routing protocol module 2013 for exchanging route information with the external IP network 2002 and another edge router connected to the optical network 2001.
- IP route for exchanging labels ⁇ Consists of two modules, MPLS label exchange protocol module 2014, IP routing table 2015 that holds correspondence between destination IP address, next hop address, and output interface number, destination IP address, input It has two tables of MPLS Label Table 2016 which hold the correspondence of label value, output label value and output interface number.
- the transfer processing unit 2012 ′ includes a plurality of IP / MPLS interfaces 2017 facing the external IP network 2002 side and a plurality of MPLS interfaces 2020 facing the optical network 2001 side.
- the IPZMPLS interface 2017 is composed of a bucket transfer processing unit 2018 that performs packet transfer processing using the destination IP address as a key, and an IP / MPLS forwarding table 2019 that is referred to at that time.
- the MPLS interface 2020 includes an MPLS transfer processing unit 2021 that performs bucket transfer processing using an MPLS label value as a key, and an MPLS forwarding table 2022 referred to at that time.
- the following processing is performed. First, of the correspondence information between the destination IP address received by the IP route ′ MPLS label exchange protocol module 2014 and the MPLS label value, only the IP address information is written into the IP routing table 2015, and the MPLS label value is included. Write all information to MP LS Label Table 2016. In the IP routing table 2015, the received destination IP address and the corresponding next hop address, that is, the IP address of the opposite edge router, and the corresponding edge router are stored in the same way as the routing table of a normal router. The output interface number directed to is written.
- the MPLS label table 2016 stores the destination IP address as shown in FIG. Address 2031, an input label value 2032, an output label value 2033, and an output interface 2034.
- the destination IP address received from the opposite edge router is written to the destination IP address 2031
- the received MPLS label value is written to the output label value 2033
- the output interface number is written to the output interface 2034.
- the routing protocol module 2013 advertises the new route information written in the IP routing table 2015 to the external IP network 2002.
- the information written in the MPLS label table 2016 is converted into the format of a forwarding table referred to at the time of bucket transfer, and transferred to the IPZMPLS interface 2017 and MPLS interface 2020.
- processing is performed as follows.
- the routing protocol module 2013 receiving the route information writes the received route into the IP routing table 2015.
- the routing protocol module 2013 notifies the IP route / MPLS label exchange protocol module 2014 that the new route information has been written to the IP routing table 201-5
- the IP route / MPLS label exchange protocol module 2014 reads the newly written route information from the IP routing table 2015 and assigns a label value corresponding to the route (destination IP address). Further, the corresponding information of the destination IP address and the assigned label value is notified to the opposing edge router using the control signal 2006, and is written in the MPLS label table 2016.
- the destination IP address read from the IP routing table 2015 is written to the destination IP address 2031, and the label value assigned by the IP route / MPLS label exchange protocol module 2014 is written to the input label value 2032.
- the information newly written in the IP routing table 2015 and the MPLS label table 2016 is converted into the format of a forwarding table referred to at the time of bucket transfer, and the IPZMPLS interface 20 Transfer to 17 and MPLS interface 2020.
- Jill 2004-1 and Edge Router 2004-2 are connected by an optical path 2005 via an optical network 2001.
- the destination IP address on the IP routing table 2015 held by each edge router 2004-1 and 2004-2 The edge routers 2004-1 and 2004-2 respectively notify the corresponding edge routers 2044-1 and 2004-2 of the corresponding relationship of the MPLS label value corresponding to the one selected by the edge routers 2004-1 and 2004-2.
- edge router 2004-2 holds the route information to 100.1.1.024, and selects the corresponding label value as 15, the combination is sent to the edge signal through the control signal 2006. Notify Router 2004-1.
- Edgler Kazuya 2004- 1 entered his IPZZPLS forwarding table 210 19 into an entry with the information that a packet addressed to 100.1.1.1./24 should be labeled 15. Add.
- an IP packet 2007 addressed to 100.1.1.1 from the external IP network 2002 is input to the edge router 2004-1.
- the interface on the optical network 2001 side has the MPLS label Only the processing can be limited, and the IP processing can be omitted.
- the edge rule of this embodiment can be realized by using a computer as an information processing device. That is, by installing in a computer device, the optical network 1 which is one core network and a plurality of external IP networks 2002 are mutually connected to the computer device at the boundary points thereof.
- Input function corresponding to the PLS interface 201, and optical network 2001 to the external IP network 2 A program for realizing a function corresponding to an edge router having an output function corresponding to the MPLS interface 202 that processes an output IP packet to the input IP packet 202.
- the input function includes a destination IP address and a destination IP address.
- IP ZM PLS forwarding table 210 Corresponds to the IP ZM PLS forwarding table 210 that holds the correspondence table with the identifier indicating the output interface of the corresponding other edge router. And a packet transfer for assigning the identifier corresponding to the destination IP address of the IP bucket to the IP packet based on the IP ZM PLS forwarding table 210 when transferring the IP packet to another edge router.
- a function corresponding to the processing section 21018 is realized.
- an MPLS transfer processing section 202 and MPLS for referring to the identifier and transferring an IP bucket to an output interface indicated by the identifier are provided.
- the combination device By installing a program for realizing a function corresponding to the forwarding table 202 into a computer device, the combination device can be made a device corresponding to the edge router of the present embodiment. it can.
- An MPLS label is used as the identifier.
- the computer device can control the correspondence information between the destination IP address and the identifier corresponding to the destination IP address by a control signal as a function of the edge router of the present embodiment.
- a function corresponding to the control signal processor 2101, which is exchanged between edge routers, is realized.
- the control signal processor 210 A function of generating or updating the correspondence table based on the correspondence information acquired in 1 is realized.
- the program of the present embodiment is recorded on the recording medium of the present embodiment, and
- the user device can use the recording medium to install the program of the present embodiment.
- the program of the present embodiment can be directly installed in a computer device via a network from a server holding the program of the present embodiment.
- the present embodiment can be implemented in addition to the first embodiment by mounting some of the functions described in the present embodiment on the optical edge router 1003 in FIG. 4, and can be implemented in the first embodiment.
- the economics and scalability of edge routers can be improved by using a cut-through method.
- the optical edge line 1003 in FIG. 4 by adding a function to exchange the MPLS label value to the 80? Processing unit 1317, the IP route in Fig. 8
- the MPLS label value storage function By adding the MPLS label value storage function to the bucket transfer tape storage unit 1322, it is equivalent to the IPZMPLS forwarding table 2019 in FIG. 8, and by adding the MPLS transfer function to the packet transfer processing unit 1321b.
- the optical edge line 1003 in FIG. 4 has a function equivalent to the et al.
- FIG. 16 is a diagram illustrating a data transfer network configuration according to the third embodiment of this invention.
- the plurality of circuit switches 3200 are connected by one or more communication lines 3300 to form a circuit switching network.
- a plurality of bucket exchanges 31000 are connected to the circuit exchange of this circuit exchange network via the communication line 3300, and a bucket exchange network is constituted.
- the circuit switch 3200 includes a circuit switch and a circuit path control unit.
- the line switch is connected to the line switch of one or more other line switches via a plurality of communication lines.
- the line path control unit controls the line switch and connects the two communication lines.
- Communication lines correspond to, for example, optical lines, SDHZSONET lines, ATM lines, MP LS-LSP, FR lines, and the like.
- the circuit path control section includes a circuit path control section of one or more other circuit switches 3200 and a circuit path control section of the bucket switch 31000, and a communication path 3700 between the circuit switches and a communication path 3 between the bucket switch and the circuit switch, respectively. 6- £ »CH connected here.
- the line path control unit exchanges information such as the number of communication lines connecting the mutual line exchanges via the inter-exchange communication path 3700. For example, by using a communication protocol such as OSPF- ⁇ (see Prior Art Document 4) or PNNI (see Prior Art Document 5), the connection relation of the entire circuit switching network can be known.
- FIG. 17 is a diagram showing connection information of the circuit switching network.
- the packet switch 31000 connected to the circuit switch is composed of a packet switch, a circuit path control unit, a coordination control unit, and a packet path control unit.
- the packet switch is connected to one or more circuit switches 3200 by a communication line 3300.
- the circuit path control unit is connected to the circuit path control unit of one or more circuit switches 3200 and the communication line 3600 between the bucket switch and the circuit switch.
- the line path control unit collects information such as the number of communication lines of the circuit switching network via the communication path. For example, by using a communication protocol such as OSPF-TE (see Prior Art Document 4) or PNNI (see Prior Art Document 5), it is possible to know the connection relationship of the entire circuit switching network.
- FIG. 17 is a diagram showing connection information of the circuit switching network.
- the bucket path control unit inserts a packet path information message into the communication line 3300 by the bucket input / extraction circuit.
- the inserted bucket path information message is transferred to one or more other bucket path control units via the communication line 3300.
- FIG. 18 is a diagram showing route information of the packet switching network.
- the packet transfer route can be determined based on this route information.
- the bucket switching network is equivalent to an IP packet network and the like, and uses the OSPF (see prior art document 7) protocol and the like to determine the connection relation of the bucket network and determine the bucket transfer route. It is possible to For example, it is determined that a bucket addressed to the packet switch 3100-0-3 from the packet switch 3100-1 is transferred to the communication line 3300-1.
- the coordinating control unit when instructed by the maintenance personnel or the like to set up a new communication line between any two packet exchanges to the 'bucket exchange', uses the connection information of the circuit exchange network collected by the circuit path control and Then, referring to the two pieces of the packet switching network connection information collected by the packet path control unit, select a communication line, and instruct the line path control to send a connection line setting control message. For example, from the connection-related information, the communication lines 3 0 0 1 1 2 and 3 0 0 2-1 and 3 0 0 5 between the packet switch 1 00 0-1 and the bucket switch 1 00 0-2.
- FIG. 19 is a view for explaining a fourth embodiment of the present invention.
- the data transfer network of the present embodiment is composed of a plurality of circuit switches 3200, a plurality of bucket switches 310, and a bucket / circuit switch 3200- It consists of 1 and a communication line connecting each exchange.
- the bucket circuit switch 3200-0-1 includes a circuit switch, a bucket switch, a circuit path control unit, a packet path control unit, and a cooperation control unit.
- the circuit path control unit in the present embodiment is configured by connecting the circuit path control unit of the bucket switch 310 of the third embodiment and the circuit path control unit of the circuit switch 320 by an internal communication path. ing.
- the line switch has a function of connecting arbitrary communication lines connected to the line switch.
- the packet switch has a function of selecting and outputting a communication line to be transferred based on destination information of a packet transmitted by the communication line.
- the circuit path control unit is connected to the circuit path control unit of the circuit switch by the communication path between the circuit switches, and ascertains the line connection status of the communication network by exchanging communication line connection information. have.
- the packet small path control unit exchanges packet path information with the packet switch connected via the communication line via the communication line, thereby grasping the connection relation information of the packet exchange and obtaining the packet destination information. Based on this, it has a function to determine the communication line to be output.
- the coordination control unit has a function of receiving an instruction for a new communication line from a maintenance person or the like.When an instruction for a new communication line is received, the connection information of the circuit switching network collected by the line path control unit and the bucket path control. With reference to the two pieces of information on the connection of the bucket exchange collected by the unit, the new communication line route is selected and the setting route of the new communication line is instructed to the line route control unit.
- the line route control unit sends a connection line setting control message to the circuit switch to set up the line, and sends the message to the circuit switch receiving the connection line setting control message.
- the communication line is set based on the connection line setting control message, and the message is transmitted according to the instructed route, and the communication line is set between the bucket exchange and the bucket-line exchange.
- ADVANTAGE OF THE INVENTION while improving the utilization efficiency of optical resources by accommodating a plurality of IP networks in a single optical network, autonomous control of the optical path according to the status of the IP network can be realized. One-shot cost reduction is also possible. At the same time, conceal optical path topology changes from external IP networks This makes it possible to stably maintain the routing of the IP network. That is, according to the present invention, it is possible to provide an optical network or the like that can realize a multi-layer cooperation function and has high network stability.
- IP address search processing is limited to input edge routers only, and output edge routers can select output interfaces only by processing simple identifiers such as MPLS labels, thereby simplifying the processing required at the optical network side interface. And contributes to economical edge routers.
- the interface speed can be expected to increase with the simplification of processing, the speed per optical path can be increased by increasing the speed per optical path, thereby improving the speed within the core network. The number of optical paths can be reduced, and network scalability can be improved.
- the packet switch can use the information of the circuit switch network to optimally arrange communication lines between the packet switches.
- the packet circuit switch can use the information of the circuit switch network to optimally arrange communication lines with the bucket switch. This makes it possible to use communication lines according to the situation such as the amount of traffic in the packet-switched network at that time, and realize efficient use of resources that constitute communication lines such as optical fiber wavelengths. You.
Abstract
Description
Claims
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US10/544,156 US8532087B2 (en) | 2003-02-03 | 2004-02-02 | Optical network, optical edge router, program thereof, cut through method, and edge router |
EP04707288.9A EP1592181B1 (en) | 2003-02-03 | 2004-02-02 | Optical network, optical edge router, program thereof, cut through method, and edge router |
JP2005504806A JP3895360B2 (ja) | 2003-02-03 | 2004-02-02 | 光ネットワーク、光エッジルータ及びそのプログラム |
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EP (3) | EP2043380A1 (ja) |
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CN104243204B (zh) * | 2014-09-03 | 2017-10-27 | 中国电子科技集团公司第三十四研究所 | 光通信网中设备的状态收集和远端控制的方法 |
US10237202B2 (en) | 2015-03-06 | 2019-03-19 | Nec Corporation | Network control device, network control method, and recording medium for program |
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Also Published As
Publication number | Publication date |
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EP1592181A4 (en) | 2008-06-04 |
US20060126642A1 (en) | 2006-06-15 |
JPWO2004071033A1 (ja) | 2006-06-01 |
EP2043380A1 (en) | 2009-04-01 |
EP1592181A1 (en) | 2005-11-02 |
US8532087B2 (en) | 2013-09-10 |
JP3895360B2 (ja) | 2007-03-22 |
EP1592181B1 (en) | 2015-01-21 |
EP2034676A1 (en) | 2009-03-11 |
EP2034676B1 (en) | 2014-11-12 |
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