CN118233791A - Optical switching network system and optical switching network implementation method - Google Patents

Abstract

The invention discloses an optical switching network system and an optical switching network implementation method, wherein when an SDN controller in the system detects that any SDN switch sends a network segment access request, a destination port of optical switching equipment corresponding to the network segment access request is determined; and when the SDN controller detects that the destination port is unoccupied, the SDN controller performs increasing sequence sequencing on the destination port, and performs connection update on the sequencing optical switch according to a sequencing result so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the sequencing optical switch after connection update. The invention can calculate the sorting result of the destination port based on the SDN controller, and then can finish output sorting by controlling the sorting optical switch to make internal connection based on the sorting result, and further forms a non-blocking optical path based on the sorting optical switch and the optical switch unit after connection update. Therefore, the embodiment can simplify the system structure and reduce the control cost.

Description

Optical switching network system and optical switching network implementation method

Technical Field

The present invention relates to the field of digital information transmission technology, in particular to an optical switching network system and an optical switching network implementation method.

Background technique

Optical switching networks have become a popular alternative to traditional electrical switching networks due to their advantages such as high bandwidth, low latency, and low loss. Among them, the Banyan switching network can be used to design and implement optical switching networks with its simple structure, free routing, and unique path.

However, the Banyan network is a generalized non-blocking network, and there is a problem of internal path conflict. In order to solve this problem, a Batcher network can be added in front of the Banyan network to impose a pre-sorting to achieve strict non-blocking, thereby adding multiple levels of nodes and connections to the system, increasing the control cost of the system. Therefore, how to propose a non-blocking optical switching network with a simple structure and low control cost has become an urgent problem to be solved.

The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art.

Summary of the invention

The main purpose of the present invention is to provide an optical switching network system and an optical switching network implementation method, aiming to solve the technical problem of providing a non-blocking optical switching network with a simple structure and low control cost.

To achieve the above object, the present invention provides an optical switching network system, which includes: an SDN controller, a plurality of SDN switches and an optical switching device; the optical switching device includes a sorting optical switch and a plurality of optical switch units, and the sorting optical switch and the optical switch units form an optical switching network;

The SDN controller is provided with a southbound interface, the southbound interface is connected to a first end of the SDN switch, and a second end of the SDN switch is connected to the optical switching device;

The SDN controller is configured to determine, when detecting that any of the SDN switches sends a network segment access request, that the network segment access request corresponds to a destination port of the optical switching device;

The SDN controller is further configured to sort the destination ports in ascending order when detecting that the destination port is not occupied, and to update the connection of the sorted optical switch according to the sorting result, so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the sorted optical switch after the connection update.

Optionally, the SDN controller is further used to update the state of the optical switch unit according to the binary code of the destination port, so as to establish a target optical path corresponding to the network segment access request based on the connection of the updated sorting optical switch and the updated state of the optical switch unit.

Optionally, the SDN controller is further configured to generate a sorting configuration instruction according to the ascending sorting result of the destination port, and send the sorting configuration instruction to the sorting optical switch through the southbound interface, and the sorting optical switch performs the connection update upon receiving the sorting configuration instruction;

The SDN controller is further used to generate a state configuration instruction according to the binary code of the destination port, and send the state configuration instruction to the optical switch unit through the southbound interface. The optical switch unit performs the state update when receiving the state configuration instruction.

Optionally, the SDN controller is further configured to pool the port resources of the optical switching device to generate the port resource pool when the optical switching device is detected; the port resource pool includes the sorting optical switch and the plurality of optical switch units;

The SDN controller is further used to obtain node information of the sorting optical switch and the optical switch unit, and generate a connection configuration instruction according to the node information;

The SDN controller is further used to send a connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit.

Optionally, a port occupancy table is stored in the SDN controller, and the port occupancy table includes a port segment mapping relationship and a port occupancy status of the optical switching network;

The SDN controller is further configured to detect whether the destination port is occupied according to the port occupancy table;

The SDN controller is further configured to return the established optical path corresponding to the target port to the SDN switch corresponding to the network segment access request when detecting that the destination port is occupied.

Optionally, the SDN controller is further configured to, when detecting that a new optical path is established in the optical switching network, obtain an updated source network segment and an updated destination network segment corresponding to the new optical path;

The SDN controller is further configured to update the port occupancy table according to the update source network segment and the update destination network segment.

Optionally, the SDN controller is further provided with a northbound interface; the northbound interface is connected to the user interface;

The northbound interface is used to query the port status of the optical switching network when receiving a query instruction input by the user interface;

The northbound interface is further used to perform optical path control on the optical switching network when receiving an optical path configuration instruction input by the user interface.

Optionally, the northbound interface includes: a query submodule and a configuration submodule;

The query submodule is used to feedback the port occupancy status of the optical switching network when receiving the query instruction input by the user interface;

The configuration submodule is used to configure, delete or reset the optical path of the optical switching network when receiving the optical path configuration instruction input by the user interface.

In addition, to achieve the above-mentioned purpose, the present invention also proposes an optical switching network implementation method based on the above-mentioned optical switching network system, wherein the optical switching network implementation method is executed by the network twin service, and the optical switching network implementation method includes:

When the SDN controller detects that any of the SDN switches sends a network segment access request, it determines that the network segment access request corresponds to a destination port of the optical switching device;

When the SDN controller detects that the destination port is not occupied, it sorts the destination port in ascending order, generates a sorting configuration instruction according to the ascending sorting result of the destination port, and sends the sorting configuration instruction to the sorting optical switch through the southbound interface, and the sorting optical switch performs a connection update when receiving the sorting configuration instruction;

The SDN controller generates a state configuration instruction according to the binary code of the destination port, and sends the state configuration instruction to the optical switch unit through the southbound interface. The optical switch unit updates the state upon receiving the state configuration instruction, and establishes a target optical path corresponding to the network segment access request based on the connection of the updated sorting optical switch and the optical switch unit after the state update.

Optionally, when the SDN controller detects that the SDN switch sends a network segment access request, before determining that the network segment access request corresponds to a destination port of the optical switching device, the SDN controller further includes:

When the SDN controller detects the optical switching device, the port resources of the optical switching device are pooled to generate the port resource pool;

The SDN controller obtains node information of the sorting optical switch and the optical switch unit, and generates a connection configuration instruction according to the node information;

The SDN controller sends a connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit.

The present invention discloses an optical switching network system and an optical switching network implementation method, the system comprises: an SDN controller, a plurality of SDN switches and an optical switching device; the optical switching device comprises a sorting optical switch and a plurality of optical switch units, the sorting optical switch and the optical switch unit constitute an optical switching network; the SDN controller is provided with a southbound interface, the southbound interface is connected to the first end of the SDN switch, and the second end of the SDN switch is connected to the optical switching device; the SDN controller is used to determine the destination port of the optical switching device corresponding to the network segment access request when detecting that any SDN switch sends a network segment access request; the SDN controller is also used to sort the destination port in increasing order when detecting that the destination port is not occupied, and update the connection of the sorting optical switch according to the sorting result, so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the sorting optical switch after the connection is updated. The SDN controller is also used to update the state of the optical switch unit according to the binary code of the destination port, so as to construct a target optical path corresponding to the network segment access request based on the sorting optical switch after the connection is updated and the optical switch unit after the state is updated. The SDN controller is also used to generate a sorting configuration instruction according to the ascending sorting result of the destination port, and send the sorting configuration instruction to the sorting optical switch through the southbound interface. The sorting optical switch performs a connection update when receiving the sorting configuration instruction; the SDN controller is also used to generate a state configuration instruction according to the binary code of the destination port, and send the state configuration instruction to the optical switch unit through the southbound interface. The optical switch unit performs a state update when receiving the state configuration instruction. The SDN controller stores a port occupancy table, which includes the port network segment mapping relationship and port occupancy status of the optical switching network; the SDN controller is also used to detect whether the destination port is occupied according to the port occupancy table; the SDN controller is also used to return the established optical path corresponding to the target port to the SDN switch corresponding to the network segment access request when detecting that the destination port is occupied. The SDN controller is also used to obtain the updated source network segment and the updated destination network segment corresponding to the new optical path when detecting that a new optical path is established in the optical switching network; the SDN controller is also used to update the port occupancy table according to the updated source network segment and the updated destination network segment. The present invention can design a set of software-hardware combined sorting-Banyan optical switching network based on SDN software technology. The prior art needs to sort through a complex Batcher network, which has a complex structure and complex control. The present invention can be combined with an SDN controller and a sorting optical switch. When constructing an optical path, the SDN controller only needs to calculate the sorting result of the destination port by software, so as to control the sorting optical switch to update the internal connection to complete the sorting, thereby forming an optical path. Therefore, the present invention can simplify the system structure and reduce the control cost. Compared with the traditional Banyan switching network with Log2N level nodes of N×N ports, the present invention only adds a layer of sorting optical switch. Although there are (Log2N+1) level nodes at this time, the added sorting optical switch can be combined with SDN software technology to realize sorting pre-position, and the complexity is much lower than the traditional Batcher-Banyan network. At the same time, the present invention can realize sorting calculation and scheduling through the system software layer, and send the corresponding connection configuration instructions and state configuration instructions to the OCS device through the Openflow protocol to realize the function of the sorting-Banyan optical switching network, so as to construct the optical path simply and quickly, and also reduce the control difficulty.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a block diagram of a first embodiment of an optical switching network system according to the present invention;

FIG2 is a system physical architecture diagram of a first embodiment of an optical switching network system of the present invention;

FIG3 is a schematic diagram showing port occupancy of a first embodiment of an optical switching network system of the present invention;

4 is a schematic diagram of the state of an optical switch unit of a first embodiment of an optical switching network system of the present invention;

5 is a schematic diagram of the software architecture of the second embodiment of the optical switching network system of the present invention;

6 is a schematic diagram of the northbound interface configuration of the second embodiment of the optical switching network system of the present invention;

7 is a schematic diagram of optical switching network connections of a second embodiment of an optical switching network system of the present invention;

8 is a schematic diagram of the port arrangement relationship of the second embodiment of the optical switching network system of the present invention;

FIG9 is a system architecture diagram of a second embodiment of an optical switching network system of the present invention;

10 is a schematic diagram of a first process of a first embodiment of a method for implementing an optical switching network according to the present invention;

FIG. 11 is a schematic diagram of a second flow chart of the first embodiment of the optical switching network implementation method of the present invention.

The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

It is understandable that in order to solve the problem of internal path conflicts in the Banyan network, the existing solution is to add a Batcher network in front of the Banyan network, but since the Batcher network itself has a relatively complex structure, it will greatly increase the complexity of the system structure, and thus also increase the control cost of the system. At the same time, SDN (Software Defined Network) has been widely used since its birth because of its centralized management and control layer, and optical switching networks are no exception, and many OCS (Optical Circuit Switching) also support SDN controller management.

Therefore, in order to solve the above problems, a simple optical switching network is proposed. In this embodiment, an SDN controller can be used to manage and control OCS, pool its port resources, simulate multiple 2×2 optical switches to build a Banyan multi-stage switching network, and implement pre-Batcher sorting at the software level to replace the complex connections in the existing actual Batcher network. This can simplify the complexity of the networking structure and control algorithm while realizing a strictly non-blocking network. Specifically, an embodiment of the present invention provides an optical switching network system, referring to Figure 1, which is a structural block diagram of a first embodiment of an optical switching network system of the present invention.

In this embodiment, the system includes: an SDN controller, a plurality of SDN switches and an optical switching device; the optical switching device includes a sorting optical switch and a plurality of optical switch units, and the sorting optical switch and the optical switch units form an optical switching network;

The SDN controller is provided with a southbound interface, the southbound interface is connected to a first end of the SDN switch, and a second end of the SDN switch is connected to the optical switching device;

The SDN controller is configured to determine, when detecting that any of the SDN switches sends a network segment access request, that the network segment access request corresponds to a destination port of the optical switching device;

The SDN controller is further configured to sort the destination ports in ascending order when detecting that the destination port is not occupied, and to update the connection of the sorted optical switch according to the sorting result, so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the sorted optical switch after the connection update.

It should be noted that the optical switching network system proposed in this embodiment can be applied to any network, wherein the above-mentioned SDN controller is an application in the software defined network (SDN), which is responsible for traffic control to ensure the intelligent network. The SDN switch is a new type of switch device, which can communicate with the SDN controller by using the OpenFlow protocol, receive and execute the instructions of the SDN controller, and realize flexible control of network traffic. In practical applications, the SDN switch can be connected to different physical network devices (mobile phones, computers or tablets, etc.) or OVS (Open VSiwtch, virtual switch) to realize network communication of connected devices.

It is easy to understand that the above-mentioned network segment access request is a connection request sent by the device connected to the access end of the SDN switch. The access device can be an OVS device or other host device. For ease of understanding, Figure 2 is used as an example for illustration. Figure 2 is a system physical architecture diagram of the first embodiment of an optical switching network system of the present invention. As shown in Figure 2, in this embodiment, the first end of each SDN switch can be connected to the SDN controller through a southbound interface, and the second end of each SDN switch is connected to the optical switching device. At the same time, the access end of each SDN switch can be connected to the OVS device or other host device. The OVS device or other host device is responsible for managing the devices under the defined network segment, which are uniformly managed by the SDN controller.

It should be understood that the above-mentioned optical switching equipment is an OCS (Optical Circuit Switching) device that supports SDN control, which can establish an optical path from the source end to the destination end for each connection request (a dedicated wavelength needs to be allocated on each link). As shown in Figure 2, in this embodiment, the port of OCS can be divided into two parts: a sorting module, namely the above-mentioned sorting optical switch and a number of 2×2 optical switch units. It is easy to understand that, among them, a number of 2×2 optical switch units can constitute a Banyan structure optical switching network, and combined with the sorting optical switch, a sorting-Banyan optical switching network can be formed. At the same time, the sorting optical switch can perform output sorting under the control of the SDN controller, thereby avoiding internal conflict problems in the Banyan network. Therefore, compared with the complex Batcher network structure of the existing solution, this embodiment can achieve output sorting through a sorting optical switch, which greatly simplifies the system structure, that is, reduces the control cost.

It is understandable that the above network segment access request may include the destination network segment that the access device needs to connect to or access. Therefore, when the SDN controller detects that any SDN switch sends a network segment access request, it needs to determine the OCS device output port corresponding to the destination network segment included in the network segment access request, that is, the occupancy of the above destination port.

It is easy to understand that in order to reduce control complexity and improve control efficiency, in this embodiment, a port occupancy table may be pre-established in the SDN controller, and the port occupancy table may include the port segment mapping relationship and port occupancy status of the sorting-Banyan optical switching network in the OCS device. Therefore, further, as an implementable method, in this embodiment, the SDN controller is also used to detect whether the destination port is occupied according to the port occupancy table;

The SDN controller is further configured to return the established optical path corresponding to the target port to the SDN switch corresponding to the network segment access request when detecting that the destination port is occupied.

It should be noted that the above-mentioned port-to-network segment mapping relationship can be a mapping relationship between the input and output ports of the sorting-Banyan optical switching network and the corresponding connected network segment (or gateway) address, and the above-mentioned port occupancy status can be the occupancy status of the optical path between the input port and the output port of the sorting-Banyan optical switching network (or the occupancy status of the system input and output ports). For ease of understanding, assuming that the sorting-Banyan optical switching network is an optical switching network with an 8×8 structure in actual application, Figure 3 is used as an example for illustration. Figure 3 is a schematic diagram of the port occupancy table of the first embodiment of an optical switching network system of the present invention. As shown in Figure 3, the port occupancy table can store the occupancy status of 8 input ports and 8 output ports and the corresponding connected network segment (or gateway) address respectively. Among them, the network segment row stores the network segment (or gateway) address of the port connection; the occupied row stores the port status, and the port status is represented by a number, -1 means unoccupied, 0-7 means occupied, and also refers to the opposite end port of the optical path, that is, the corresponding connected port. Therefore, Figure 3 can indicate that there are three optical paths in the optical switching network: input 0-output 7, input 1-output 6, and input 2-output 4, and the network segment address corresponding to input 0 is: 1.1.0.x, the network segment address corresponding to input 7 is: 1.1.15.x, and the network segment mapping relationship of the remaining ports is similar, which will not be repeated here.

It should be understood that if the SDN controller learns that the destination port is occupied by querying the port occupancy table, it means that a stable optical path has been established between the destination port and an input port. The SDN controller can directly feedback the established optical path currently corresponding to the destination port to the SDN switch that sends the network segment access request. Specifically, the SDN controller can return the input and output port numbers and the corresponding network segments corresponding to the two ends of the established optical path, thereby establishing a communication connection between the access device that sends the network segment access request and the network segment corresponding to the destination port.

It can be understood that the above port occupancy table needs to be continuously updated and maintained. Therefore, further, as an implementable method, in this embodiment, the SDN controller is also used to obtain an updated source network segment and an updated destination network segment corresponding to the new optical path when a new optical path is detected to be established in the optical switching network;

The SDN controller is further configured to update the port occupancy table according to the update source network segment and the update destination network segment.

It should be noted that the above-mentioned update source network segment can be the network segment corresponding to the input port of the new optical path, and the update destination network segment can be the network segment corresponding to the output port of the new optical path. After the new optical path is established, the SDN controller can map the update source network segment and the update destination network segment to the corresponding access port, and then update the port network segment mapping relationship and port occupancy status stored in the port occupancy table in real time. In addition, in addition to the above situation, when it is detected that the OVS host or other host device is connected to the sorting-Banyan optical switching network, the input or output port will also report this situation to the SDN controller. The SDN controller can also map the network segment managed by the OVS host or other host device to the access port, and then update the port occupancy table through the above method.

It should be understood that if the SDN controller learns that the destination port is not occupied by querying the port occupation table, it means that the current destination port does not have a corresponding optical path, and the SDN controller needs to extract the destination port and establish a corresponding optical path. Therefore, this embodiment can sort the destination ports in ascending order, and update the connection of the sorted optical switch according to the sorting result, so as to construct the target optical path corresponding to the network segment access request based on the optical switch unit and the sorted optical switch after the connection update.

It is easy to understand that in the sorting-Banyan optical switching network, there may be other output ports other than the destination port that have established or are to establish optical paths, that is, there is more than one optical path in the sorting-Banyan optical switching network. Therefore, in order to avoid conflicts within the sorting-Banyan optical switching network, this embodiment can replace the existing complex wiring Batcher network at the software level by combining the pre-Batcher sorting with the sorting optical switch, that is, in this embodiment, the SDN controller can be combined with the sorting optical switch to sort the output ports.

Further, as an implementable embodiment, in this embodiment, the SDN controller is further used to generate a sorting configuration instruction according to the ascending sorting result of the destination port, and send the sorting configuration instruction to the sorting optical switch through the southbound interface, and the sorting optical switch performs the connection update when receiving the sorting configuration instruction;

It should be noted that, in this embodiment, the SDN controller can sort the destination ports and other output ports that need to be sorted in ascending order. For example, if the output ports corresponding to the input ports 0-2 of the sorting-Banyan optical switching network are output ports 7, 4, and 6, respectively, then the ascending sorting results output by the SDN controller may be: output ports 4, 6, and 7. After calculating the ascending sorting results, the SDN controller can generate the corresponding sorting configuration instructions, and send them to the sorting optical switch through the southbound interface based on the OpenFlow protocol. The sorting optical switch performs a connection update upon receiving the sorting configuration instructions, and the optical paths output by the updated sorting optical switch are also arranged according to the ascending sorting results. If, as shown above, the output ports corresponding to the input ports 0-2 of the sorting-Banyan optical switching network are output ports 7, 4, and 6, respectively, then the optical paths corresponding to the outputs of the updated sorting optical switch are: the optical path of output port 4, the optical path of output port 6, and the optical path of output port 7.

It is easy to understand that after the above-mentioned sorting optical switch performs connection update, only the connection relationship inside the sorting optical switch is updated. In order to avoid conflicts inside the sorting-Banyan optical switching network, the SDN controller in this embodiment also needs to schedule the internal state of the optical switch unit to form a complete optical path. Therefore, further, as an implementable method, in this embodiment, the SDN controller is also used to update the state of the optical switch unit according to the binary code of the destination port, so as to form a target optical path corresponding to the network segment access request based on the sorting optical switch after the connection update and the optical switch unit after the state update.

It is understandable that the optical switch units are all switches of 2x2 structure, and their internal states can be 0 or 1. For ease of understanding, FIG4 is taken as an example for illustration, which is a schematic diagram of the states of the optical switch units of the first embodiment of an optical switching network system of the present invention. As shown in FIG4, state 0 can indicate that the input of the 2×2 switch is always connected to the upper end of the output; state 1 can indicate that the input of the 2×2 switch is always connected to the lower end of the output.

Specifically, as an implementable method, in this embodiment, the SDN controller is also used to generate a status configuration instruction according to the binary code of the destination port, and send the status configuration instruction to the optical switch unit through the southbound interface, and the optical switch unit performs the status update when receiving the status configuration instruction.

It should be noted that each output port including the destination port can be encoded by a corresponding binary code, for example, output port 7 corresponds to binary code 111, output port 6 corresponds to binary code 110, and output port 4 corresponds to binary code 100. The binary code of each output port corresponds to the state of the optical switch unit through which the corresponding output optical path passes. Therefore, in this embodiment, the SDN controller can also generate a state configuration instruction according to the binary code of the destination port, and send the state configuration instruction to the optical switch unit through the southbound interface. When the optical switch unit receives the state configuration instruction, it performs the corresponding internal state configuration, thereby forming a target optical path corresponding to the destination port based on the connection of the updated sorting optical switch and the optical switch unit after the state is updated.

In summary, this embodiment can design a set of software and hardware combined sorting-Banyan optical switching network based on SDN software technology. Specifically, compared with the traditional Banyan switching network with N×N ports and Log2N-level nodes, this embodiment only adds a layer of sorting optical switches. Although there are (Log2N+1)-level nodes at this time, the added sorting optical switches can be combined with SDN software technology to achieve sorting pre-positioning, and the complexity is much lower than the traditional Batcher-Banyan network. At the same time, this embodiment can implement sorting calculation and orchestration scheduling through the system software layer, and send the corresponding connection configuration instructions and status configuration instructions to the OCS device through the Openflow protocol to realize the function of the sorting-Banyan optical switching network, which can simply and quickly build an optical path and reduce the control difficulty.

The present embodiment discloses an optical switching network system, which includes: an SDN controller, a plurality of SDN switches and an optical switching device; the optical switching device includes a sorting optical switch and a plurality of optical switch units, and the sorting optical switch and the optical switch unit constitute an optical switching network; the SDN controller is provided with a southbound interface, the southbound interface is connected to the first end of the SDN switch, and the second end of the SDN switch is connected to the optical switching device; the SDN controller is used to determine the destination port of the optical switching device corresponding to the network segment access request when detecting that any SDN switch sends a network segment access request; the SDN controller is also used to sort the destination port in increasing order when detecting that the destination port is not occupied, and update the connection of the sorting optical switch according to the sorting result, so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the sorting optical switch after the connection is updated. The SDN controller is also used to update the state of the optical switch unit according to the binary code of the destination port, so as to construct a target optical path corresponding to the network segment access request based on the sorting optical switch after the connection is updated and the optical switch unit after the state is updated. The SDN controller is also used to generate a sorting configuration instruction according to the ascending sorting result of the destination port, and send the sorting configuration instruction to the sorting optical switch through the southbound interface. The sorting optical switch performs a connection update when receiving the sorting configuration instruction; the SDN controller is also used to generate a state configuration instruction according to the binary code of the destination port, and send the state configuration instruction to the optical switch unit through the southbound interface. The optical switch unit performs a state update when receiving the state configuration instruction. The SDN controller stores a port occupancy table, which includes the port network segment mapping relationship and port occupancy status of the optical switching network; the SDN controller is also used to detect whether the destination port is occupied according to the port occupancy table; the SDN controller is also used to return the established optical path corresponding to the target port to the SDN switch corresponding to the network segment access request when detecting that the destination port is occupied. The SDN controller is also used to obtain the updated source network segment and the updated destination network segment corresponding to the new optical path when detecting that a new optical path is established in the optical switching network; the SDN controller is also used to update the port occupancy table according to the updated source network segment and the updated destination network segment. This embodiment can design a set of software and hardware combined sorting-Banyan optical switching network based on SDN software technology. The existing technology needs to sort through a complex Batcher network, which has a complex structure and complex control. This embodiment can be combined with an SDN controller and a sorting optical switch. When constructing an optical path, the SDN controller only needs to calculate the sorting result of the destination port by software, so as to control the sorting optical switch to update the internal connection to complete the sorting, thereby forming an optical path. Therefore, this embodiment can simplify the system structure and reduce the control cost. Compared with the traditional Banyan switching network with Log2N-level nodes of N×N ports, this embodiment only adds a layer of sorting optical switches. Although there are (Log2N+1)-level nodes at this time, the added sorting optical switch can be combined with SDN software technology to realize sorting pre-position, and the complexity is much lower than the traditional Batcher-Banyan network. At the same time, this embodiment can realize sorting calculation and orchestration scheduling through the system software layer, and send the corresponding connection configuration instructions and status configuration instructions to the OCS device through the Openflow protocol to realize the function of sorting-Banyan optical switching network, which can simply and quickly build an optical path and reduce the control difficulty.

5 , which is a schematic diagram of the software architecture of the second embodiment of the optical switching network system of the present invention, based on the first embodiment shown in FIG. 1 above, a second embodiment of the optical switching network system of the present invention is proposed.

As shown in FIG5 , in this embodiment, the SDN controller is further provided with a northbound interface; the northbound interface is connected to the user interface;

The northbound interface is used to query the port status of the optical switching network when receiving a query instruction input by the user interface;

The northbound interface is further used to perform optical path control on the optical switching network when receiving an optical path configuration instruction input by the user interface.

It should be noted that the above-mentioned northbound interface can be an external API (Application Programming Interface) interface of the SDN connector, which can be displayed externally in the network UI (Website User Interface) interface in the terminal device. When the user logs in to the UI interface, the API interface can be used to provide information query and optical path control services to the user. Specifically, the northbound interface can be used to query the network address mapping, the port and the optical path occupancy status between ports, and can also be used to edit and sort the optical paths of the Banyan optical switching network according to the optical path configuration instructions entered by the user through the user interface.

Further, as an implementable method, in this embodiment, the northbound interface includes: a query submodule and a configuration submodule;

The query submodule is used to feedback the port occupancy status of the optical switching network when receiving the query instruction input by the user interface;

The configuration submodule is used to configure, delete or reset the optical path of the optical switching network when receiving the optical path configuration instruction input by the user interface.

It should be understood that, in this embodiment, the above-mentioned query submodule can be used to query the occupancy and mapping relationship of the ports corresponding to the optical paths already included in the sorting-Banyan optical switching network of the current system; the configuration submodule can be used to manually edit the status of the optical path, that is, to manually add, delete or reset the optical path in the sorting-Banyan optical switching network of the current system. Specifically, as shown in Figure 6, Figure 6 is a schematic diagram of the northbound interface configuration of the second embodiment of the optical switching network system of the present invention. As shown in Figure 6, five interfaces can be configured in the northbound interface, and the five interfaces can be used to query the occupancy of the input port, the occupancy of the output port, manually add (or configure) the optical path, manually delete (or release) the optical path, and manually reset the optical path. The result corresponding to the northbound interface displayed on the UI interface is shown in the return column of Figure 6, and this embodiment will not be repeated.

It can be understood that when the user inputs the instruction to manually configure or delete the optical path through the user interface, the SDN controller can send the corresponding connection configuration instructions and status configuration instructions to the sorting optical switch and optical switch unit through Openflow to connect the N×N sorting optical switch and the 2×2 optical switch unit to generate or delete a path. This part of the connection is updated in real time after the calculation and arrangement according to the request of the SDN controller, and the port occupancy table needs to be updated after the path is changed.

It is easy to understand that the connection configuration instructions and state configuration instructions issued by the above SDN control can only control the internal connection between the sorting optical switch and the optical switch unit. In order to further achieve the strict non-blocking of the sorting-Banyan optical switching network, this embodiment can also set the fixed connection between the sorting optical switch and the optical switch unit in advance according to the port of the OCS device. Therefore, in this embodiment, the SDN controller is also used to pool the port resources of the optical switching device when detecting the optical switching device to generate the port resource pool;

The SDN controller is further used to obtain node information of the sorting optical switch and the optical switch unit, and generate a connection configuration instruction according to the node information;

The SDN controller is further used to send a connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit.

It should be noted that in this embodiment, an optical switching device supporting SDN control is used. Therefore, when the SDN controller detects the optical switching device, it can manage several OCS ports according to the number of optical ports of the optical switching device itself to form a port resource pool and perform the following tasks:

First, the SDN controller can form an N×N sorting optical switch, the number of ports of the sorting optical switch is consistent with the scale of the NxN Batcher sorting ports, and the sorting switch port numbers are stored in the resource pool for easy calling.

Then, the SDN controller can group the remaining OCS ports into several 2×2 optical switch units in groups of 4, which can functionally implement 0/1 state switching and form a Banyan network. At this time, the 0/1 switch port number can also be stored in the resource pool for easy call.

Finally, the sorting optical switch is connected to the Banyan network input port (specific numbered 2x2 optical switch port) to form a sorting-Banyan optical switching network. The SDN controller can obtain the node information of the determined sorting optical switch and optical switch unit, and determine the fixed arrangement between the sorting optical switch and the optical switch unit that will not cause blocking based on the node information, and generate connection configuration instructions based on the determined fixed arrangement and send them to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit. It is easy to understand that all connections are completed by the controller after completing resource pooling and starting to send configuration.

In a specific implementation, the scheduling storage method in the pool can be divided according to the nodes of the sorting-Banyan networking, and Figure 7 is used as an example for illustration. Figure 7 is a schematic diagram of the optical switching network connection of the second embodiment of the optical switching network system of the present invention. Assume that the optical switching network is an 8×8 structured network, that is, the SDN controller can divide it into S0, S1, S2 and S3 nodes after detecting the optical switching network. Among them, the S0 node can be an 8×8 sorting optical switch with a total of port numbers 0-15; S1 to S3 can be three-level nodes representing Banyan network ports, each level has port numbers 0-15, and S1 to S3 each have 4 2x2 optical switch ports, such as S1.0-S1.3 represent the four ports of the first 2×2 optical switch under the S1 node. The solid line connection between the sorting optical switch and the optical switch unit in Figure 7 is the fixed connection mentioned above, which is a fixed arrangement after the system is started and cannot be changed; the internal connection between the sorting optical switch and the optical switch unit is the above-mentioned configurable, deleted or reset optical path, which is the SDN controller that arranges and calculates the internal connection of the sorting optical switch and the 2×2 optical switch according to the source to destination port of the optical path. This part of the connection can be adjusted and transformed in real time according to the request as mentioned above. It can be understood that the connection relationship of the SDN controller to arrange the nodes at all levels (taking the connection in Figure 7 as an example, the optical path from system input 000 to system output 111) can be implemented by referring to the following pseudo code:

system.inport[0] = s0[0];

s0[0].next = s0[10];

s0[10].next = s1[4];

s1[4].next = s1[13];

s1[13].next = s2[5];

s2[5].next = s2[13];

s2[13].next = s3[6];

s3[6].next = s3[15];

system.outport[7]=s3[15].

It should be understood that the correspondence between the input and output ports of the optical switching network system and the sorting-Banyan port also needs to be preserved, for example, the system input 0-7 corresponds to the 0-7 port of the S0 node, and the output 0-7 corresponds to the 8-15 port of the S3 node. The intuitive port arrangement relationship can be referred to Figure 8, which is a schematic diagram of the port arrangement relationship of the second embodiment of the optical switching network system of the present invention.

Therefore, when the network structure of the optical switching equipment is an 8×8 structure, this embodiment can construct a 4-level node 8×8 non-blocking sorting-Banyan network based on SDN technology. Here, Figure 7 is used as an example to illustrate the optical path construction process of the sorting-Banyan network, assuming that the three optical paths between the input port and the output port are 0:7, 1:6 and 2:4 respectively).

The SDN controller must first sort the destination ports of the three optical paths in ascending order (the S0 sorting switch is completed). After sorting, the outputs of S0 from top to bottom can be 100, 110, and 111 (corresponding to destination ports 4, 6, and 7). Therefore, the SDN controller sends down the configuration to connect ports 0, 1, and 2 of S0 to ports 10, 9, and 7 respectively.

Next, based on the unique characteristics of the Banyan network path, the binary codes (100, 110, 111) of the system output ports 4, 6, and 7 are also the basis for controlling the state of the 2×2 optical switch of the Banyan network node. Each bit of the binary code from high to low is an input parameter for controlling the 0/1 state of the corresponding 2×2 optical switch at each node. Therefore, the state of the three paths through the 2×2 optical switch can be expressed as:

S1[0]->S1[9]->S2[4]->S2[12]->S3[4]->S3[12](100, output port 4);

S1[2]->S1[11]->S2[6]->S2[15]->S3[7]->S3[14](110, output port 6);

S1[4]->S1[13]->S2[5]-S2[13]->S3[6]->S3[15](111, output port 7).

The above statement can be understood in conjunction with the definition in FIG8 , for example, S1[0] represents port 0 of the S1 node. It can be seen that the SDN controller only needs the sorting results and binary codes of all optical path destination ports to control the internal connection of the corresponding switches, without the need for complex control costs. The specific system architecture refers to FIG9 , which is a system architecture diagram of the second embodiment of the optical switching network system of the present invention. As can be seen from FIG9 , the input and output ends of the optical switching network system can be interconnected using the sorting-Banyan network within the system, that is, this embodiment can construct a non-blocking optical switching network with a simple structure and easy control.

This embodiment discloses that the SDN controller is also provided with a northbound interface; the northbound interface is connected to the user interface; the northbound interface is used to query the port status of the optical switching network when receiving a query instruction input by the user interface; the northbound interface is also used to control the optical path of the optical switching network when receiving an optical path configuration instruction input by the user interface. In this embodiment, the northbound interface includes: a query submodule and a configuration submodule; the query submodule is used to feedback the port occupancy of the optical switching network when receiving a query instruction input by the user interface; the configuration submodule is used to configure, delete or reset the optical path of the optical switching network when receiving an optical path configuration instruction input by the user interface. Therefore, this embodiment can facilitate users to conduct timely and rapid information query and manual configuration of the optical path through the northbound interface, thereby simplifying the control difficulty. In addition, in this embodiment, the SDN controller is also used to pool the port resources of the optical switching device to generate a port resource pool when the optical switching device is detected; the SDN controller is also used to obtain the node information of the sorting optical switch and the optical switch unit, and generate a connection configuration instruction according to the node information; the SDN controller is also used to send the connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit. Therefore, this embodiment can realize non-blocking interconnection of the input and output ends based on the fixed connection between the sorting optical switch and the optical switch unit and the optical path connection inside the switch.

An embodiment of the present invention provides an optical switching network implementation method based on the above optical switching network system. Referring to FIG. 10 , FIG. 10 is a schematic diagram of a first flow chart of a first embodiment of the optical switching network implementation method of the present invention.

In this embodiment, the optical switching network implementation method is implemented based on the above optical switching network system, and the optical switching network implementation method includes the following steps:

Step S10: When the SDN controller detects that any of the SDN switches sends a network segment access request, the SDN controller determines that the network segment access request corresponds to a destination port of the optical switching device;

It should be noted that the execution subject of the method of this embodiment can be an SDN controller deployed in any network, which can be an application in the software defined network (SDN) responsible for traffic control to ensure the intelligent network. The SDN switch is a new type of switch device, which can communicate with the SDN controller by using the OpenFlow protocol, receive and execute the instructions of the SDN controller, and realize flexible control of network traffic. In practical applications, the SDN switch can be connected to different physical network devices (mobile phones, computers or tablets, etc.) or OVS (Open VSiwtch, virtual switch) to realize network communication of connected devices.

It is easy to understand that the above network segment access request is a connection request sent by the device connected to the access end of the SDN switch. The access device can be an OVS device or other host device. The OVS device or other host device is responsible for managing the devices under the defined network segment and is uniformly managed by the SDN controller.

Step S20: When the SDN controller detects that the destination port is not occupied, it sorts the destination port in ascending order, generates a sorting configuration instruction according to the ascending sorting result of the destination port, and sends the sorting configuration instruction to the sorting optical switch through the southbound interface. The sorting optical switch performs a connection update upon receiving the sorting configuration instruction;

Step S30: The SDN controller generates a status configuration instruction according to the binary code of the destination port, and sends the status configuration instruction to the optical switch unit through the southbound interface. The optical switch unit updates the status upon receiving the status configuration instruction, and establishes a target optical path corresponding to the network segment access request based on the connection of the updated sorting optical switch and the optical switch unit after the status update.

It should be understood that the above optical switching equipment is an OCS (Optical Circuit Switching) equipment that supports SDN control, which can establish an optical path from the source end to the destination end for each connection request (a dedicated wavelength needs to be allocated on each link). It is understandable that the above network segment access request may include the destination network segment that the access device needs to connect or access. Therefore, when the SDN controller detects that any SDN switch sends a network segment access request, it needs to determine the OCS device output port corresponding to the destination network segment included in the network segment access request, that is, the occupancy of the above destination port.

It is easy to understand that in order to reduce the control complexity and improve the control efficiency, the present embodiment may pre-establish a port occupancy table in the SDN controller, and the port occupancy table may include the port network segment mapping relationship and port occupancy status of the sorting-Banyan optical switching network in the OCS device. The port network segment mapping relationship may be a mapping relationship between the input and output ports of the sorting-Banyan optical switching network and the corresponding connected network segment (or gateway) address, and the port occupancy status may be the occupancy status of the optical path between the input port and the output port of the sorting-Banyan optical switching network (or the occupancy status of the system input and output ports).

It should be understood that if the SDN controller learns that the destination port is occupied by querying the port occupancy table, it means that a stable optical path has been established between the destination port and an input port. The SDN controller can directly feedback the established optical path currently corresponding to the destination port to the SDN switch that sends the network segment access request. Specifically, the SDN controller can return the input and output port numbers and the corresponding network segments corresponding to the two ends of the established optical path, thereby establishing a communication connection between the access device that sends the network segment access request and the network segment corresponding to the destination port.

If the SDN controller learns that the destination port is not occupied by querying the port occupancy table, it means that the current destination port does not have a corresponding optical path, and the SDN controller needs to extract the destination port and establish a corresponding optical path. Therefore, this embodiment can sort the destination ports in ascending order, and update the connection of the sorting optical switch according to the sorting result. In the sorting-Banyan optical switching network, there may be output ports other than the destination port that have established or are yet to establish optical paths, that is, there is more than one optical path in the sorting-Banyan optical switching network. Therefore, in order to avoid conflicts within the sorting-Banyan optical switching network, this embodiment can replace the existing complex wiring Batcher network at the software level by combining the pre-Batcher sorting with the sorting optical switch, that is, this embodiment can sort the output ports by the SDN controller in combination with the sorting optical switch. The specific sorting process is as described above and will not be repeated here.

It is understandable that after the above-mentioned sorting optical switch performs connection update, only the connection relationship inside the sorting optical switch is updated. In order to avoid conflicts within the sorting-Banyan optical switching network, the SDN controller in this embodiment also needs to schedule the internal state of the optical switch unit to update the state of the optical switch unit, thereby forming a complete optical path, and then return the newly built completed optical path to the SDN switch that sends the network segment access request. The specific connection update and state update process is as described above and will not be repeated here.

It is easy to understand that the connection configuration instructions and state configuration instructions issued by the above SDN control can only control the internal connection between the sorting optical switch and the optical switch unit. In order to further realize the strict non-blocking of the sorting-Banyan optical switching network, this embodiment can also set the fixed connection between the sorting optical switch and the optical switch unit according to the port of the OCS device in advance. Therefore, further, as an implementable method, refer to Figure 11, which is a second flow diagram of the first embodiment of the optical switching network implementation method of the present invention. In this embodiment, before step S10, it also includes:

Step S01: When the SDN controller detects the optical switching device, the SDN controller pools the port resources of the optical switching device to generate the port resource pool;

Step S02: the SDN controller obtains node information of the sorting optical switch and the optical switch unit, and generates a connection configuration instruction according to the node information;

Step S03: the SDN controller sends a connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit.

It should be noted that in this embodiment, an optical switching device supporting SDN control is used. Therefore, when the SDN controller detects the optical switching device, it can manage several OCS ports according to the number of optical ports of the optical switching device itself to form a port resource pool and perform the following tasks:

First, the SDN controller can form an N×N sorting optical switch, the number of ports of the sorting optical switch is consistent with the scale of the NxN Batcher sorting ports, and the sorting switch port numbers are stored in the resource pool for easy calling.

Then, the SDN controller can group the remaining OCS ports into several 2×2 optical switch units in groups of 4, which can functionally implement 0/1 state switching and form a Banyan network. At this time, the 0/1 switch port number can also be stored in the resource pool for easy call.

Finally, the sorting optical switch is connected to the Banyan network input port (specifically numbered 2x2 optical switch port) to form a sorting-Banyan optical switching network. The SDN controller can obtain the node information of the determined sorting optical switch and optical switch unit, and determine the fixed arrangement between the sorting optical switch and the optical switch unit that will not cause blocking based on the node information, and generate connection configuration instructions based on the determined fixed arrangement and send them to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit. It is easy to understand that all connections are completed by the controller after completing resource pooling and starting the configuration. The specific configuration process and connection effect can be shown in Figure 7, which will not be repeated here.

It is understandable that the above port occupancy table needs to be constantly updated and maintained. Therefore, when a new optical path is established, the SDN controller can map the network segment corresponding to the input port of the new optical path and the network segment corresponding to the output port of the new optical path to the corresponding access port, and then update the port network segment mapping relationship and port occupancy status stored in the port occupancy table in real time. In addition, in addition to the above situation, when it is detected that the OVS host or other host device is connected to the sorting-Banyan optical switching network, the input or output port will also report this situation to the SDN controller. The SDN controller can also map the network segment managed by the OVS host or other host device to the access port, and then update the port occupancy table through the above method.

In summary, this embodiment can design a set of software and hardware combined sorting-Banyan optical switching network based on SDN software technology. Specifically, compared with the traditional Banyan switching network with N×N ports and Log2N-level nodes, this embodiment only adds a layer of sorting optical switches. Although there are (Log2N+1)-level nodes at this time, the added sorting optical switches can be combined with SDN software technology to achieve sorting pre-positioning, and the complexity is much lower than the traditional Batcher-Banyan network. At the same time, this embodiment can implement sorting calculation and orchestration scheduling through the system software layer, and send the corresponding connection configuration instructions and status configuration instructions to the OCS device through the Openflow protocol to realize the function of the sorting-Banyan optical switching network, which can simply and quickly build an optical path and reduce the control difficulty.

This embodiment discloses a method for implementing an optical switching network, which includes: when an SDN controller detects an optical switching device, pooling the port resources of the optical switching device to generate a port resource pool; the SDN controller obtains node information of the sorting optical switch and the optical switch unit, and generates a connection configuration instruction according to the node information; the SDN controller sends the connection configuration instruction to the sorting optical switch and the optical switch unit to form a fixed connection between the sorting optical switch and the optical switch unit. When the SDN controller detects that any SDN switch sends a network segment access request, it determines the destination port of the optical switching device corresponding to the network segment access request; when the SDN controller detects that the destination port is not occupied, it sorts the destination port in ascending order, generates a sorting configuration instruction according to the result of the ascending sorting of the destination port, and sends the sorting configuration instruction to the sorting optical switch through the southbound interface. The sorting optical switch updates the connection when receiving the sorting configuration instruction; the SDN controller generates a state configuration instruction according to the binary code of the destination port, and sends the state configuration instruction to the optical switch unit through the southbound interface. The optical switch unit updates the state when receiving the state configuration instruction, and constructs the target optical path corresponding to the network segment access request based on the sorting optical switch after the connection update and the optical switch unit after the state update.

It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims (10)

1. An optical switching network system, the system comprising: an SDN controller, a plurality of SDN switches and optical switching equipment; the optical switching equipment comprises a sequencing optical switch and a plurality of optical switch units, wherein the sequencing optical switch and the optical switch units form an optical switching network;

The SDN controller is provided with a southbound interface, the southbound interface is connected with a first end of the SDN switch, and a second end of the SDN switch is connected with the optical switching equipment;

The SDN controller is configured to determine, when detecting that any of the SDN switches sends a network segment access request, that the network segment access request corresponds to a destination port of the optical switching device;

The SDN controller is further configured to perform, when detecting that the destination port is unoccupied, order-increasing ordering on the destination port, and perform connection update on the ordering optical switch according to an ordering result, so as to construct a target optical path corresponding to the network segment access request based on the optical switch unit and the ordering optical switch after connection update.

2. The optical switching network system of claim 1, wherein,

The SDN controller is further configured to perform a state update on the optical switch unit according to the binary code of the destination port, so as to construct a target optical path corresponding to the network segment access request based on the sequenced optical switch after the connection update and the optical switch unit after the state update.

3. The optical switching network system of claim 2, wherein,

The SDN controller is further configured to generate a sorting configuration instruction according to an increasing sorting result of the destination port, and send the sorting configuration instruction to the sorting optical switch through the southbound interface, where the sorting optical switch performs the connection update when receiving the sorting configuration instruction;

The SDN controller is further configured to generate a state configuration instruction according to the binary code of the destination port, and send the state configuration instruction to the optical switch unit through the southbound interface, where the optical switch unit performs the state update when receiving the state configuration instruction.

4. The optical switching network system of claim 1, wherein,

The SDN controller is further configured to pool port resources of the optical switching device when the optical switching device is detected, and generate the port resource pool; the port resource pool comprises the sequencing optical switch and the plurality of optical switch units;

The SDN controller is further used for acquiring node information of the sequencing optical switch and the optical switch unit and generating a connection configuration instruction according to the node information;

the SDN controller is further configured to issue a connection configuration instruction to the sequencing optical switch and the optical switch unit, so as to form a fixed connection between the sequencing optical switch and the optical switch unit.

5. The optical switch network system of claim 1, wherein a port occupancy table is stored in the SDN controller, the port occupancy table including a port segment mapping relationship and a port occupancy condition of the optical switch network;

The SDN controller is further configured to detect whether the destination port is occupied according to the port occupancy table;

The SDN controller is further configured to return, when it is detected that the destination port is occupied, an established optical path corresponding to the destination port to an SDN switch corresponding to the network segment access request.

6. The optical switching network system of claim 5, wherein the SDN controller is further configured to, when detecting that a new optical path is established in the optical switching network, obtain an update source network segment and an update destination network segment corresponding to the new optical path;

The SDN controller is further configured to update the port occupancy table according to the update source network segment and the update destination network segment.

7. The optical switching network system of claim 1, wherein the SDN controller is further provided with a northbound interface; the north interface is connected with the user interface;

the north interface is used for inquiring the port state of the optical switching network when receiving an inquiry command input by the user interface;

The north interface is further configured to perform optical path control on the optical switching network when receiving an optical path configuration instruction input by the user interface.

8. The optical switching network system of claim 7, wherein the northbound interface comprises: a query sub-module and a configuration sub-module;

the inquiry submodule is used for feeding back the port occupation condition of the optical switching network when receiving the inquiry instruction input by the user interface;

the configuration submodule is used for carrying out optical path configuration, deletion or reset on the optical switching network when receiving the optical path configuration instruction input by the user interface.

9. An optical switching network implementation method based on the optical switching network system according to any one of claims 1 to 5, characterized in that the method comprises:

When the SDN controller detects that any SDN switch sends a network segment access request, determining that the network segment access request corresponds to a destination port of the optical switching device;

when the SDN controller detects that the destination port is unoccupied, the destination port is subjected to order-increasing ordering, an ordering configuration instruction is generated according to an order-increasing ordering result of the destination port, the ordering configuration instruction is issued to the ordering optical switch through the southbound interface, and the ordering optical switch performs connection updating when receiving the ordering configuration instruction;

The SDN controller generates a state configuration instruction according to the binary code of the destination port, and issues the state configuration instruction to the optical switch unit through the southbound interface, the optical switch unit performs the state update when receiving the state configuration instruction, and a target optical path corresponding to the network segment access request is constructed based on the ordered optical switch after connection update and the optical switch unit after state update.

10. The method of implementing an optical switch network of claim 9, wherein the SDN controller, when detecting that the SDN switch sends a network segment access request, before determining that the network segment access request corresponds to a destination port of the optical switch device, further includes:

When the SDN controller detects the optical switching equipment, port resources of the optical switching equipment are pooled, and the port resource pool is generated;

the SDN controller obtains node information of the sequencing optical switch and the optical switch unit, and generates a connection configuration instruction according to the node information;

and the SDN controller issues a connection configuration instruction to the sequencing optical switch and the optical switch unit to form fixed connection between the sequencing optical switch and the optical switch unit.