CN116419100A

CN116419100A - Method and equipment for communicating optical transport network service

Info

Publication number: CN116419100A
Application number: CN202111656180.5A
Authority: CN
Inventors: 陈巍; 郑瑜
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-07-11
Also published as: WO2023124234A1

Abstract

The invention provides a method for communicating OTN business of an optical transport network, which is applied to an OTN system comprising first boundary point equipment BP1 and second boundary point equipment BP2, and comprises the following steps: BP1 receives a first message which is sent by first access point equipment and comprises a service identifier and a first user side channel identifier from a first port corresponding to a private network identifier; BP1 sends a second message comprising a private network identifier and a service identifier to BP 2; BP2 receives a third message which is sent by second access point equipment and comprises a service identifier and a second user side channel identifier from a second port corresponding to the private network identifier; BP2 allocates network side channel corresponding to service identifier in optical transmission tunnel between BP1 and BP2 corresponding to private network identifier, and establishes connection between second user side channel and network side channel; BP2 sends a fourth message comprising private network identification, service identification and identification of a network side channel to BP 1; and the BP1 establishes connection between the network side channel and the first user side channel according to the fourth message.

Description

Method and equipment for communicating optical transport network service

Technical Field

The present invention relates to the field of communications, and in particular, to a method and apparatus for communicating optical transport network services.

Background

With the development of all-optical service networks, optical transport networks (Optical Transport Network, OTN) are gradually sinking to metropolitan areas, covering a large number of edge nodes, and extending to access network devices. For such large-scale networks, operators typically divide network domains, for example by administrative area, by equipment provider, or by technical domain.

In the field of domain management, the requirement of cross-domain service appears. In the prior art, a unified network management configuration method is generally adopted, namely a top-level unified network management controller is deployed, global management is carried out on all domains of the whole OTN network, resource information such as relevant interfaces, links and the like of all devices in the network is firstly obtained, and then relevant configuration information is uniformly issued to open end-to-end service. The method has high management cost and poor flexibility.

Disclosure of Invention

The embodiment of the invention provides a method and equipment for communicating optical transport network services, which can complete the communication of cross-domain services by boundary point equipment without additional top network management for establishing an end-to-end service path.

In a first aspect, an embodiment of the present invention provides a method for communicating OTN services of an optical transport network, which is applied to an OTN system including a first endpoint device and a second endpoint device, including: the first boundary point equipment receives a first message sent by first access point equipment from a first port corresponding to the private network identification, wherein the first message comprises a service identification and a first user side channel identification; the first boundary point equipment sends a second message to the second boundary point equipment, wherein the second message comprises a private network identifier and a service identifier; the second boundary point equipment receives a third message sent by the second access point equipment from a second port corresponding to the private network identifier, wherein the third message comprises a service identifier and a second user side channel identifier; the second boundary point equipment distributes a network side channel corresponding to the service identifier in an optical transmission tunnel between the first boundary point equipment and the second boundary point equipment corresponding to the private network identifier, and establishes connection between the second user side channel and the network side channel; the second boundary point equipment sends a fourth message to the first boundary point equipment, wherein the fourth message comprises a private network identifier, a service identifier and a network side channel identifier; and the first boundary point equipment establishes connection between the network side channel and the first user side channel according to the fourth message.

By the method for dynamically distributing the network side channel resources, the communication of the cross-domain service can be completed by the boundary point equipment. The flexibility and the expandability of the system are improved.

In one possible design, the optical transmission tunnel is an optical channel data unit ODU, and the network side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU. Further improving the flexibility of the system.

In yet another possible design, the first message, the second message, the third message, or the fourth message is carried in the overhead of the OTN. The first message, the second message, the third message, or the fourth message is an extended path computation element protocol PCEP message or a border gateway protocol BGP message. These designs improve the compatibility of the system.

In a second aspect, an embodiment of the present invention provides a method for communicating OTN services of an optical transport network, which is applied to a boundary point device in an OTN, including: receiving a first message sent by the access point device through a port corresponding to the private network identifier, and receiving a second message sent by another boundary point device, wherein the first message comprises a service identifier and a user side channel identifier, and the second message comprises the private network identifier and the service identifier; and establishing connection between the user side channel and the network side channel according to the first message and the second message, wherein the network side channel is positioned in an optical transmission tunnel between the local boundary point equipment and another boundary point equipment corresponding to the private network identification.

Likewise, by the method for dynamically distributing the network side channel resources, the communication of the cross-domain service can be completed by the boundary point equipment. The flexibility and the expandability of the system are improved.

In one possible design, receiving the first message and the second message includes: and receiving the first message, determining that the second message is not received according to the private network identifier and the service identifier, sending a third message comprising the private network identifier and the service identifier to another boundary point device, and receiving the second message returned by the other boundary point device, wherein the second message comprises the identifier of the network side channel. These designs increase the flexibility of the system.

In yet another possible design, receiving the first message and the second message specifically includes: receiving a first message, and determining that a second message sent by another boundary point device is received according to the private network identifier and the service identifier; the establishing connection between the user side channel and the network side channel according to the first message and the second message specifically comprises: distributing network side channels corresponding to service identifiers in the optical transmission tunnel, and establishing connection between the user side channels and the network side channels according to the user side channel identifiers; the method further comprises the steps of: and sending a third message comprising the private network identifier, the service identifier and the network side channel identifier to another boundary point device. These designs increase the flexibility of the system.

Also, in one possible design, the optical transport tunnel is an ODU and the network side channel is an OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU. To further increase the flexibility of the system.

In yet another possible design, the messages are carried in the overhead of the OTN. The message may be an extended PCEP message or BGP message. These designs improve the compatibility of the system.

In a third aspect, an embodiment of the present invention provides an optical transmission system, which includes executing the first endpoint device and the second endpoint device in the method of the first aspect, which are not described in detail.

In a fourth aspect, an embodiment of the present invention provides an optical transmission device, which has a function of implementing the optical transmission boundary point device behavior in the method in the second aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions, including, for example: a communication unit and a connection unit, wherein the communication unit is used for: receiving a first message sent by the access point device through a port corresponding to the private network identifier, and receiving a second message sent by another boundary point device, wherein the first message comprises a service identifier and a user side channel identifier, and the second message comprises the private network identifier and the service identifier; the connection unit is used for: and establishing connection between the user side channel and the network side channel according to the first message and the second message, wherein the network side channel is positioned in an optical transmission tunnel between the local boundary point equipment and another boundary point equipment corresponding to the private network identification.

In one possible design, the structure of the optical transmission device includes a processor and a memory, the memory being configured to store program codes for performing the above-described method, the processor being configured to execute the program stored in the memory.

In a fifth aspect, an embodiment of the present invention provides a computer storage medium storing computer software instructions for use with the above-described optical transmission device, including a program designed to execute the above-described aspects.

According to the technical scheme provided by the embodiment of the invention, the end-to-end service path is established by dynamically distributing the network side channels, and the communication of the cross-domain service can be completed by the boundary point equipment without additionally adding a top network manager. The service can be configured independently, and when the network scale and the service scale are continuously enlarged, the flexibility is high and the expandability is good.

Drawings

Fig. 1 is a schematic diagram of an OTN network system architecture according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a communication OTN service according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of another communication OTN service according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an optical transmission device according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of an optical transmission device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. It will be apparent that the described embodiments are merely some, but not all, of the embodiments of the present application. As a person of ordinary skill in the art can know, with the development of technology and the appearance of new scenes, the technical solutions provided in the embodiments of the present application are applicable to similar technical problems.

The method for communicating OTN services provided by the embodiment of the invention is applied to an OTN system comprising a plurality of domains. Fig. 1 is a schematic diagram of an OTN system according to an embodiment of the present invention. The OTN system includes 1 intermediate domain, and 4 edge domains N1, N2, N3, N4 connected through the intermediate domain. The intermediate domain includes 3 Boundary Point (BP) devices BP1, BP2, BP3, which are connected to Access Point (AP) devices AP1, AP2, AP3, AP4 in the 4 edge domains N1, N2, N3, N4, respectively. After OTN service is communicated, application devices in the edge domains N1, N2, N3 and N4 are interconnected through access point devices and boundary point devices.

In the method for communicating OTN services provided by the embodiment of the present invention, a private network is formed by a plurality of application devices and access point devices in the edge domain. For example, in the system shown in fig. 1, a private network may be formed by N1 and N2; or a private network can be formed by N1, N2 and N4. The access point device of the edge domain is connected with the boundary point device of the middle domain, and the boundary point device of the middle domain can be connected with a plurality of edge domains to support a plurality of private networks. For example, in fig. 1, BP1 connects two edge domains N1 and N4 through two ports.

In a private network which can support a plurality of services, for example, in a private network consisting of N1 and N2, a service a can be formed by an application device E1 in N1 and an application device E2 in N2; the application devices E1, E5 in N1 and the application devices E2, E6 in N2 constitute the service B. The end-to-end service can be distinguished by combining different private network identifications and service identifications.

The embodiment of the invention provides a method for communicating OTN services, which is applied to the OTN system shown in fig. 1. As shown in fig. 2, an edge domain N1 and an edge domain N2 form a private network "1", and an application device E1 and an application device E2 form a service "a" in the private network, so as to implement end-to-end service communication. The method specifically comprises the following steps:

s201, configuring private network identifiers and corresponding ports at boundary point equipment, and configuring optical transmission tunnels between boundary points corresponding to the private network identifiers.

And configuring a private network identifier and a corresponding port on the boundary point equipment connected with the private network, wherein the corresponding port is connected with the access point equipment of the edge domain contained in the private network. In the example shown in fig. 2, a private network ID and a corresponding port connected to AP1 are configured in BP 1. And configuring a private network identification ID and a corresponding port connected with the AP2 in the BP2. The private network ID may be composed of letters or numbers. For example, the private network ID is "1". Further, an optical transmission tunnel connected to BP2 corresponding to the private network is configured on BP1, and an optical transmission tunnel connected to BP1 corresponding to the private network is configured on BP2. The optical transport tunnel may be an ODUk (Optical channel Data Unit ) tunnel, or an OSU (Optical Service Unit, optical traffic unit) tunnel. The optical transport tunnel includes a plurality of network-to-network interface (NNI) channels for supporting data access requirements of a plurality of services in the private network. The configuration can be realized through a network management system or can be directly realized on boundary point equipment.

S202, configuring service in the edge domain N1.

After configuration, the application device E1 in the edge domain may connect with the outside domain through the access point device AP 1. The AP1 is configured with a service identification ID. The service ID may consist of letters or numbers, for example the service ID is "a". The service ID may be unique within the private network or globally unique. The AP1 is further configured with an identifier of a first user side channel (user-network interface, UNI) of the connection BP1 corresponding to the service ID, for example, the first user side channel identifier is OSU channel number "1.1".

S203, the AP1 sends a first message to the BP 1.

The sent first message includes a service ID "a" and a first user side channel identifier "1.1". The first packet may be implemented by an extended PCEP (Path Computation Element Protocol ) or BGP (Border Gateway Protocol, border gateway protocol), carried in the overhead of the OTN, such as GCC0/1/2, as will the "packet" appearing hereinafter.

S204, BP1 sends a second message to BP2.

And the BP1 determines that the first message is associated with the private network ID '1' according to the port for receiving the first message, and the BP1 stores the corresponding relation of the private network ID, the service ID and the first user side channel identifier. And the BP1 sends a second message to other boundary point devices of the same private network so as to inform the boundary point devices of service related information. The second message includes private network ID, service ID, and the device identifier "BP1".

And after the BP2 receives the second message, the corresponding relation of the private network ID, the service ID and the boundary point equipment identifier BP1 is locally stored.

S205, the service is configured in the edge domain N2.

Similarly to step S202 described above, after configuration, the edge domain application device E2 may connect with the outside domain through the access point device AP 2. The AP2 is configured with a service identification ID "a". The AP2 is further configured with an identifier of a second user side channel (user-network interface, UNI) connected to BP2 corresponding to the service ID, for example, the second user side channel identifier is OSU channel number "2.2".

S206, the AP2 sends a third message to the BP2.

Similar to the above step S203, the third packet is sent to include the service ID "a" and the second user side channel identifier "2.2". The third message may also be implemented by extending PCEP or BGP.

S207, BP2 connects the second user-side channel and the network-side channel.

The BP2 determines, according to the port from which the third packet is received, that the third packet is associated with the private network ID "1", and further determines, according to the third packet including the service ID "a" and the corresponding relationship between the private network ID, the service ID, and the BP1 stored after the BP2 receives the second packet in the foregoing step 204, that the connection between the BP1 and the BP2 needs to be established for the service "a". BP2 selects one network-side channel NNI from the optical transmission tunnel between BP1 and BP2, for example, the channel number is "x". The optical transmission tunnel is an optical channel data unit ODU, and the network side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU.

After determining the network side channel NNI, BP2 generates a cross mapping path locally, and connects the second user side channel "2.2" and the network side channel "x".

S208, BP2 sends a fourth message to BP 1.

The BP2 sends a fourth message to the BP1 to inform NNI information related to BP1 service. The fourth message includes private network ID "1", service ID "a", and identifier "x" of network side channel.

S209, BP1 connects the network-side channel and the first user-side channel.

The BP1 acquires that the BP2 has selected the network side channel "x" of the service "a" according to the information in the fourth message, and the BP1 generates a cross mapping path locally to connect the network side channel "x" and the first user side channel "1.1", i.e. the BP1 connects the first user side channel of the AP1 in the step S202.

By the method, the end-to-end service path is established between N1 and N2, and the communication of the cross-domain service can be completed by the boundary point equipment without additionally adding a top network manager. The services in different edge domains can be configured independently, and the expandability is good when the network scale is continuously enlarged.

In some scenarios, BP1 may be directly connected to a headquarter network or a cloud system of the user, so that the step S203 is not required to be executed, and only the service ID and the user side channel need to be directly configured in BP1, which is not described in detail.

In the embodiment shown in fig. 2, because the times of configuring the services in the private network are different between N1 and N2, the times of executing the steps of message receiving and sending processing, connecting the network side channel and the user side channel by the boundary point devices BP1 and BP2 are different. In general, the boundary point devices of the intermediate domain have the same function, and they may receive the message sent by the AP device before, or after. That is, one boundary point device BP may perform the processing steps of BP1 in fig. 2, and may also perform the processing steps of BP2 in fig. 2.

As shown in fig. 3, an embodiment of the present invention provides a method for communicating OTN traffic applied to a border point device BP, where a private network identifier and a corresponding port are already configured in the BP, and an optical transport tunnel is configured between the BP and another border point device in the OTN intermediate domain. The method comprises the following steps:

s301, receiving a first message sent by access point equipment and a second message sent by another boundary point equipment, wherein the first message comprises a service identifier and an identifier of a user side channel, and the second message comprises the private network identifier and the service identifier;

the BP may first receive a message from the access point device, such as BP1 in fig. 2, or may first receive a message sent by another BP, such as BP2 in fig. 2.

If the BP receives the first message sent by the access point device and determines, according to the locally stored information, that the second message sent by another BP has not been received yet, then, as in the foregoing step S204, the BP sends a message to the other BP, where the message carries a private network ID, a service ID, and a device identifier, so as to notify the peer "the peer has a service connection requirement", and the BP waits for receiving the second message returned by the peer. If the BP receives the first message sent by the access point equipment and determines that the second message sent by another BP is received according to the locally stored information, the condition of executing the subsequent connection of the user side channel and the network side channel is indicated.

If the BP receives a message sent by another BP, and according to the locally stored information, it is determined that the message sent by the AP has not been received yet, it is indicated that the AP connected with the equipment has not had a service connection requirement, the BP waits for receiving the message sent by the AP connected with the equipment, and after receiving the message, it connects the user side channel with the network side channel and notifies the other BP to connect so as to establish an end-to-end service path. If the BP receives the message sent by another BP and determines that the message sent by the AP is received according to the locally stored information, the condition of executing the subsequent connection of the user side channel and the network side channel is indicated.

S302, establishing connection between the user side channel and a network side channel according to the first message and the second message, wherein the network side channel is positioned in the optical transmission tunnel.

By the method, a plurality of BP devices can establish an end-to-end service path, and the communication of the cross-domain service can be completed only by the boundary point device without additionally adding a top network manager. The expandability of the OTN system is good.

The embodiment of the invention also provides a schematic structural diagram of the optical transmission device, as shown in fig. 4, which comprises a communication unit 401 and a connection unit 402; wherein:

the communication unit is used for: receiving a first message sent by the access point device through a port corresponding to the private network identifier, and receiving a second message sent by another boundary point device, wherein the first message comprises a service identifier and a user side channel identifier, and the second message comprises the private network identifier and the service identifier;

the connection unit is used for: and establishing connection between the user side channel and the network side channel according to the first message and the second message, wherein the network side channel is positioned in an optical transmission tunnel between the local boundary point equipment and another boundary point equipment corresponding to the private network identification.

Further, the communication unit and the connection unit implement the relevant functions in the foregoing methods, which are not described herein.

In an embodiment, the light delivery device is presented in the form of a functional unit. "unit" herein may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above described functionality. In a simple embodiment, one skilled in the art will recognize that it may be implemented using a processor, memory, and communication interface.

The optical transmission device in the embodiments of the present invention may also be implemented in the form of a computer device (or system) in fig. 5. Fig. 5 is a schematic diagram of a computer device according to an embodiment of the present invention. The computer device comprises at least one processor 501, a communication bus 502, a memory 503 and at least one communication interface 504, and may also comprise an IO interface 505.

The processor may be a general purpose Central Processing Unit (CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention.

A communication bus may include a path to transfer information between the aforementioned components.

A communication interface, using any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio Access Network (RAN), wireless local area network (Wireless Local Area Networks, WLAN), etc.

The Memory may be, but is not limited to, read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, random access Memory (random access Memory, RAM) or other type of dynamic storage device that can store information and instructions, but may also be electrically erasable programmable read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), compact disc read-Only Memory (Compact Disc Read-Only Memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be stand alone and coupled to the processor via a bus. The memory may also be integrated with the processor.

Wherein the memory is used for storing application program codes for executing the scheme of the invention, and the execution is controlled by the processor. The processor is configured to execute application code stored in the memory.

In particular implementations, the processor may include one or more CPUs, each of which may be a single-Core (single-Core) processor or a multi-Core (multi-Core) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In a specific implementation, the computer device may also include an input/output (I/O) interface, as one embodiment. For example, the output device may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like. The input device may be a mouse, a keyboard, a touch screen device, a sensing device, or the like.

The computer device may be a general purpose computer device or a special purpose computer device. In particular implementations, the computer device may be a desktop, laptop, web server, palmtop (Personal Digital Assistant, PDA), mobile handset, tablet, wireless terminal device, communication device, embedded device, or device having a similar structure as in fig. 5. Embodiments of the invention are not limited to the type of computer device.

The optical transmission boundary point device as in fig. 1 may be the device shown in fig. 5, in which one or more software modules are stored. The optical transmission device may implement the software modules by means of a processor and program code in a memory, completing the above method.

The embodiment of the present invention also provides a computer storage medium for storing computer software instructions for use in the apparatus shown in fig. 4 or fig. 5, which includes a program designed to execute the method embodiment. The above-described method can be realized by executing a stored program.

Although the invention is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. A computer program may be stored/distributed on a suitable medium supplied together with or as part of other hardware, but may also take other forms, such as via the Internet or other wired or wireless telecommunication systems.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations may be made thereto. Accordingly, the specification and drawings are merely exemplary illustrations of the present invention as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The method for communicating OTN business of the optical transport network is applied to an OTN system comprising first boundary point equipment and second boundary point equipment, and is characterized by comprising the following steps:

the first boundary point equipment receives a first message sent by first access point equipment from a first port corresponding to a private network identifier, wherein the first message comprises a service identifier and a first user side channel identifier;

the first boundary point equipment sends a second message to the second boundary point equipment, wherein the second message comprises the private network identifier and the service identifier;

the second boundary point equipment receives a third message sent by second access point equipment from a second port corresponding to the private network identifier, wherein the third message comprises the service identifier and a second user side channel identifier;

the second boundary point equipment distributes a network side channel corresponding to the service identifier in an optical transmission tunnel between the first boundary point equipment and the second boundary point equipment corresponding to the private network identifier, and establishes connection between a second user side channel and the network side channel;

the second boundary point equipment sends a fourth message to the first boundary point equipment, wherein the fourth message comprises the private network identifier, the service identifier and the identifier of the network side channel;

and the first boundary point equipment establishes the connection between the network side channel and the first user side channel according to the fourth message.

2. The method of claim 1, wherein the optical transmission tunnel is an optical channel data unit ODU, and the network side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU.

3. The method of claim 1 or 2, wherein the first, second, third, or fourth message is carried in an overhead of an OTN.

4. A method according to any one of claims 1 to 3, wherein the first, second, third or fourth message is an extended path computation element protocol PCEP message or a border gateway protocol BGP message.

5. The method for communicating OTN business of the optical transport network is applied to boundary point equipment in the OTN and is characterized by comprising the following steps:

receiving a first message sent by an access point device through a port corresponding to a private network identifier, and receiving a second message sent by another boundary point device, wherein the first message comprises the service identifier and a user side channel identifier, and the second message comprises the private network identifier and the service identifier;

and establishing connection between a user side channel and a network side channel according to the first message and the second message, wherein the network side channel is positioned in an optical transmission tunnel between the local boundary point equipment and the other boundary point equipment corresponding to the private network identification.

6. The method of claim 5, wherein the receiving the first message and the second message comprises: and receiving the first message, determining that the second message is not received yet according to the private network identifier and the service identifier, sending a third message comprising the private network identifier and the service identifier to the other boundary point device, and receiving a second message returned by the other boundary point device, wherein the second message comprises the identifier of the network side channel.

7. The method of claim 5, wherein the receiving the first message and the second message comprises: receiving the first message, and determining that a second message sent by the other boundary point equipment is received according to the private network identifier and the service identifier;

the establishing connection between the user side channel and the network side channel according to the first message and the second message specifically includes: distributing network side channels corresponding to the service identifiers in the optical transmission tunnel, and establishing connection between the user side channels and the network side channels according to the user side channel identifiers;

the method further comprises the steps of: and sending a third message comprising the private network identifier, the service identifier and the network side channel identifier to the other boundary point device.

8. The method according to any of claims 5 to 7, wherein the optical transport tunnel is an optical channel data unit ODU and the network side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU.

9. The method according to any of claims 5 to 8, wherein the first message, the second message, or the third message is carried in an overhead of an OTN.

10. The method according to any of claims 5 to 9, wherein the first, second or third message is an extended path computation element protocol, PCEP, message or a border gateway protocol, BGP, message.

11. An optical transmission system comprising a first boundary point device and a second boundary point device, wherein:

the first boundary point device is used for; receiving a first message sent by first access point equipment from a first port corresponding to private network identification, and sending a second message to second boundary point equipment, wherein the first message comprises a service identification and a first user side channel identification, and the second message comprises the private network identification and the service identification;

the second boundary point device is configured to: receiving the second message, receiving a third message sent by a second access point device from a second port corresponding to the private network identifier, wherein the third message comprises the service identifier and a second user side channel identifier, distributing a network side channel corresponding to the service identifier in an optical transmission tunnel between the first boundary point device and the second boundary point device corresponding to the private network identifier, establishing connection between the second user side channel and the network side channel, and sending a fourth message to the first boundary point device, wherein the fourth message comprises the private network identifier, the service identifier and the identifier of the network side channel;

the first boundary point apparatus is further configured to: and establishing connection between the network side channel and the first user side channel according to the fourth message.

12. The OTN system of claim 11, wherein the optical transmission tunnel is an optical channel data unit ODU, and the network side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU.

13. The OTN system of claim 11 or 12, wherein the first, second, third, or fourth message is carried in an overhead of the OTN.

14. The OTN system of any of claims 11 to 13, wherein the first, second, third, or fourth message is an extended path computation element protocol PCEP message or a border gateway protocol BGP message.

15. An optical transmission device, comprising: a communication unit, a connection unit, wherein,

the communication unit is used for: receiving a first message sent by an access point device through a port corresponding to a private network identifier, and receiving a second message sent by another boundary point device, wherein the first message comprises the service identifier and a user side channel identifier, and the second message comprises the private network identifier and the service identifier;

the connection unit is used for: and establishing connection between a user side channel and a network side channel according to the first message and the second message, wherein the network side channel is positioned in an optical transmission tunnel between the local boundary point equipment and the other boundary point equipment corresponding to the private network identification.

16. The light-transmitting device according to claim 15, wherein the communication unit is specifically configured to: and receiving the first message, determining that the second message is not received yet according to the private network identifier and the service identifier, sending a third message comprising the private network identifier and the service identifier to the other boundary point device, and receiving a second message returned by the other boundary point device, wherein the second message comprises the identifier of the network side channel.

17. The light-transmitting device according to claim 15, wherein the communication unit is specifically configured to: receiving the first message, and determining that a second message sent by the other boundary point equipment is received according to the private network identifier and the service identifier;

the connecting unit is specifically used for: distributing network side channels corresponding to the service identifiers in the optical transmission tunnel, and establishing connection between the user side channels and the network side channels according to the user side channel identifiers;

the communication unit is further configured to: and sending a third message comprising the private network identifier, the service identifier and the network side channel identifier to the other boundary point device.

18. The optical transmission apparatus according to any one of claims 15 to 17, wherein the optical transmission tunnel is an optical channel data unit ODU and the network-side channel is an optical service unit OSU; alternatively, the optical transmission tunnel is a high-order ODU, and the network-side channel is a low-order ODU.

19. The optical transmission device according to any one of claims 15 to 18, wherein the first, second, or third message is carried in an overhead of an OTN.

20. The optical transmission device according to any one of claims 15 to 19, wherein the first, second or third message is an extended path computation element protocol PCEP message or a border gateway protocol BGP message.