KR20200025084A - Network migration apparatus and method using transport SDN - Google Patents

Abstract

The present invention relates to a line rearrangement method performed by a mass line rearrangement device to rearrange lines in a transmission network software defined network (SDN). In the method, when the mass line rearrangement device extracts a connection path for at least one mass line to be relocated, the connection path for a selected arbitrary line of at least one mass line is identified. The arbitrary line is divided into a configuration section, a switching section, and a termination section, and when a command for each section is created, the created command is transmitted to at least one node forming the arbitrary line to control the command to be executed to rearrange the line.

Description

Network migration apparatus and method using transport network software defined networking {Network migration apparatus and method using transport SDN}

TECHNICAL FIELD The present invention relates to an apparatus and method for mass network relocation using transmission network software defined networking.

Recently, packet-based transmission devices (eg, Packet Transport Network (PTN), POTN, etc.) in existing TDM-based transmission devices (eg, Multi-Service Provisioning Platform (MSPP), Optical Cross Connect (OXC) device, etc.) (Packet-Optic Transport Network) equipment is building next generation transport network. Although devices such as PTN and POTN are packet-based devices, they provide integrated services including time division multiplex (TDM) based transmission services for flexible switching with legacy legacy transmission networks.

Accordingly, as legacy transmission networks and next-generation transmission networks coexist, services must be operated in a manner in which multi-domains and multi-services of multi-vendors coexist. As a result, network providers are adopting transmission network software defined network (SDN) controller technology that enables faster design and automatic configuration of complex, multi-vendor, multi-domain transport network lines.

In order to transform a multi-domain multi-vendor complex transport network into a next-generation transport network, it is necessary to transfer a large number of existing circuits to the next-generation transport network. This causes several problems, such as:

First, when switching between multi-vendor circuits, it is very difficult to manually redeploy the circuits while minimizing the down time of the circuits. One vendor network can be used to relocate with a minimum transfer time by using relocation functions or solutions provided by the vendor. However, in a multi-vendor network, since there is no solution for relocating by controlling the devices of the multi-vendor at the same time, the manual processing is performed manually. For this reason, there is a problem that the trouble of line relocation work is large, and the down time of a service line also increases.

Second, when manually relocating a multi-vendor transmission network line, the optimal relocation is impossible because the connection path of the entire E2E (end-to-end) line cannot be identified. Rather than an optimal relocation operation that takes into account the entire network, only a local relocation operation can be performed to increase the convenience of the operation.

Thirdly, it is cumbersome to manually build a database for a large number of lines, and human errors may occur due to manual processing. When a large number of circuits are switched, many databases need to be changed manually. In this case, there is a problem that incorrect data construction may occur due to a new human error.

Accordingly, the present invention provides a transmission network mass circuit relocation apparatus and method for relocating a transmission network of a multi-band by minimizing interruption of a relocation circuit using SDN.

In a method for relocating a circuit in a transmission network software defined network, a mass circuit relocation device which is one feature of the present invention for achieving the technical problem of the present invention,

Extracting a connection path for at least one of the bulk circuits to be relocated, identifying a connection interval for a selected one of the at least one bulk circuits; Dividing the interval into sections, generating the separated section-specific instructions, and transferring the generated instructions to at least one node forming the arbitrary circuit, and controlling the command to be executed to rearrange the circuits. do.

The redistributing the circuit may include controlling a configuration command to be performed in at least one configuration node included in the configuration interval among all nodes located in the connection interval for the arbitrary circuit, and configured in the at least one configuration node. If the command is executed at the same time, checking whether there are a plurality of lines formed by the switching node included in the switching section of all the nodes, if there are a plurality of lines, the predetermined number of lines of the plurality of circuits to be switched Controlling a transfer command to a transfer node; controlling, by transferring a transfer command to the transfer node such that the remaining lines of the plurality of circuits are switched when the preset number of lines is switched, and in the transfer node. When all the formed circuits are switched, the termination period of all the nodes Controlling the termination node to execute the termination command.

The extracting of the connection path may include receiving port information for searching a line, checking the connection level of the line to be searched based on the port information, and checking whether there is connection information. Checking whether there is a physical link in a first direction in both directions of a connection section; if there is a physical link, checking connection information for a time slot block; and connecting information for the time slot block in the first direction. If it matches the connection level in the direction may include the step of identifying the connection path.

According to the present invention, a large number of transmission network lines can be relocated quickly, and a database for a large number of circuits can be automatically processed.

In addition, according to the present invention, it is possible to increase the work efficiency due to the relocation of the bulk circuit transport network and to improve the database inconsistency caused by the chronic human error.

In addition, customers using the transmission network are interested in applications such as emergency transfer and circuit relocation, so that revenue generation using SDN can be expected.

1 is an exemplary diagram of an environment including an SDN server including a large-capacity circuit relocation function according to an embodiment of the present invention.
2 is a structural diagram of a transmission network bulk line relocation device according to an embodiment of the present invention.
3 is an exemplary diagram of a node for circuit relocation according to an embodiment of the present invention.
4A and 4B are flowcharts illustrating a transmission network bulk line relocation method according to an embodiment of the present invention.
5 is a flowchart of a method for searching a circuit path according to an embodiment of the present invention.
6 is an exemplary diagram for end-to-end searching according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

Hereinafter, an apparatus and method for generating a circuit path of a transmission network based on learning path information generated based on a user experience according to an embodiment of the present invention will be described with reference to the drawings. In the embodiment of the present invention, the transport network software defined networking, that is, the transport SDN server is referred to as the transport network bulk circuit relocation device 100, but is not necessarily limited thereto. In the embodiment of the present invention, the circuit is only relocated among various circuit control requests, but is not necessarily limited thereto. In addition, in the embodiment of the present invention, for convenience of description, the path is also referred to as "section".

1 is an exemplary diagram of an environment including an SDN server including a large-capacity circuit relocation function according to an embodiment of the present invention.

As shown in FIG. 1, a transmission network according to an embodiment of the present invention is a multi-domain, and will be described with an example of three domains. In the exemplary embodiment of the present invention, each domain is illustrated as an example of a packet transport network (PTN), a multi service provisioning platform (MSPP), or an optical cross connect (OXC), but is not necessarily limited thereto. It can be applied to all transmission networks. Each domain is provided with a plurality of network devices.

The transmission network mass circuit relocation device 100 interworks with a database 400, a support system 200, a plurality of manager terminals 300, and a plurality of devices included in various domains. Here, the manager terminal 300 is a terminal possessed by a manager or an operator.

The transmission network bulk line rearrangement apparatus 100 searches for the processing line according to the mass line work processing request signal transmitted from the manager terminal 300 to design the connection path and the switching line. In addition, the configuration / transition / termination interval of the line is calculated, and a control signal for controlling nodes installed in the corresponding line is generated so that the relocation of the transmission network bulk line can be performed. This will be described later in detail.

The support system 200 then interworks with the transmission network mass circuit relocation device 100. When the support system 200 completes the relocation operation of the transmission network bulk line according to the control signal of the transmission network mass line relocation device 100, the support system 200 receives the connection path information of the changed line according to the relocation operation and receives a database ( 400).

Here, the support system 200 will be described using an example including a business support system (BSS) and an operation support system (OSS). Functions of the business support system and the operation support system are already known, and detailed descriptions thereof will be omitted in the embodiments of the present invention.

The database 400 stores and manages relocation information for the transmission network bulk circuit generated by the transmission network bulk circuit relocation device 100. Here, the relocation information includes bulk channel identification information, channel path information, and the like. The database 400 stores and manages port information and connection information to be provided by the transmission network mass circuit relocation device 100 when searching the entire circuit path (End-to-End).

In the above environment, the structure of the transmission network bulk line relocation device 100 for generating a control signal so that the relocation work of the transmission network bulk line can be performed will be described with reference to FIG. 2.

2 is a structural diagram of a transmission network bulk line relocation device according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus 100 for bulk network relocation 100 includes a circuit design unit 110, a control signal generator 120, and a processor 130.

When the circuit design unit 110 receives a bulk line operation processing request signal including a line name or identification information of a line to be relocated from the manager terminal 300, the line design unit 110 is formed between the nodes and at least one node connected to the corresponding line. Extract the target line information including the paths that are already in use. Here, when the line design unit 110 receives the job processing request signal, the line design unit 110 extracts the work target line information based on the information stored in the interworking database 400.

The line design unit 110 generates a line relocation workbook for each of the extracted work target lines. Here, since the circuit design unit 110 generates the circuit relocation workbook or the information included in the circuit relocation workbook is various, the embodiment of the present invention is not limited to any one method.

In addition, the circuit design unit 110 extracts an alternate path to replace the connection path of each of the extracted work target lines based on the information stored in the database 400. And the line design part 110 designs the line about the extracted connection path. In the embodiment of the present invention, since the service is provided in the multi-vendor / multi-domain transport network environment, not the single-vendor / single-domain transport network environment, the information about the connection path is stored and managed in the database 400, and the circuit design unit 110 is provided. ) Will be described as an example.

The control signal generation unit 120 separates a circuit configuration section to form a new circuit, a switching section to be switched from an existing circuit, and a termination section to terminate the circuit from the existing circuit on the circuit designed by the circuit design unit 110. And after generating the command to be performed by the nodes located on the separated section according to the characteristics of the section, and generates a control signal for transmitting the generated command to the nodes.

The processor 130 transmits the control signal generated by the control signal generator 120 to the nodes located in the circuit relocation path, so that work such as interruption, transfer, termination, and configuration of the node for circuit relocation is performed. In addition, the processor 130 checks whether the command is executed on the line based on whether the node receives the command execution response signal according to the interruption / change / cancellation / configuration.

An example and a method of redistributing a line of a node on a transmission network to which a line is to be relocated by using the transmission network mass circuit relocation device 100 described above will be described with reference to FIGS. 3 to 5.

3 is an exemplary diagram of a node for circuit relocation according to an embodiment of the present invention.

As shown in FIG. 3, it is assumed in the embodiment of the present invention that six nodes A to F are installed between the first terminal and the second terminal. In addition, it is assumed that a packet from the first terminal to the second terminal currently moves through the path of "A-B-C-D", and redistributes the circuit connection to the C node to the E node. Only one circuit may exist between each node (eg, nodes A to B), and a plurality of circuits may exist (eg, nodes B to C).

Then, the transmission line mass circuit rearrangement apparatus 100 generates a control signal including a switching instruction and a termination instruction so that the circuit formed between the node B and the node C, and the circuit formed between the node C and the node D is performed. do. Then, a control signal including a configuration command is generated so that a circuit is newly configured from node B to node E and node E to node D.

In the above environment, a method of bulk network relocation by a transmission network will be described with reference to FIGS. 4A and 4B.

4A and 4B are flowcharts illustrating a transmission network bulk line relocation method according to an embodiment of the present invention.

First, as shown in FIG. 4A, when the network bulk line rearrangement apparatus 100 first receives a line work processing request signal from the manager terminal 300, the line identification information or line name included in the received line work processing request signal. On the basis of the extraction of the mass line of the work target (S100).

Here, when extracting a target line of work, the transmission network bulk line relocation device 100 directly inquires by the line name using a plurality of line names stored in the database 400, or is connected to a specific device which is an arbitrary node. It is possible to search and extract the existing line based on the device. Since the network mass line relocation device 100 extracts a target mass line by extracting a line name or a line connected to a specific device based on the device, it may be performed in various ways. Omit.

The transmission network mass line relocation device 100 generates a mass line relocation workbook for the extracted lines (S110). Here, the bulk line relocation work includes the high and low ports of the line, time slots, connection path information for the entire line, ring / end-to-end status for each connection path, relocation work intervals, the connection section hierarchy of the line (speed), and the number of lines. Information such as this is included. Here, the connection path information of the entire line includes device name, device port, and device time slot information of all connected devices.

When receiving a design option for circuit relocation from the plurality of manager terminals 300 connected to the transmission network mass circuit relocation device 100, the option is set as a basic circuit design option of relocation operations. The design options here include device name / port / timeslot to be relocated, passthru device name / port / timeslot for designing the circuit, exclusion device name / port / timeslot, specific network (e.g. MSPP network / PNT network) / OXC network, PONT network, etc.) via the pass option information.

 In addition, the transmission network mass line relocation device 100 extracts the connection paths of the extracted respective lines (S120). Here, in a multi-vendor / multi-domain transport network environment, the circuit full path (E2E) cannot be identified through a specific element management system (EMS) or one device. Accordingly, the end-to-end connection path of the circuits is extracted using the database 400 for connection information between each vendor and connection paths between other vendors.

When extraction of the connection path is completed in step S120, the transmission network mass circuit relocation device 100 selects an arbitrary circuit in order to perform the relocation operation for each of the plurality of relocation target circuits. Then, by performing the line design of the selected line, the connection section to the network to be relocated (S130).

The transmission network mass circuit rearrangement apparatus 100 generates a command for the corresponding line by separating the configuration section, the transfer section, and the termination section of the corresponding line, respectively (S140). When the command generation is completed, the transmission network mass circuit relocation device 100 transmits a relocation command of the line to a node in the path of each line, and confirms whether the circuit relocation is successful (S150).

If the circuit relocation is successful, the transmission network mass circuit relocation device 100 transmits the result of the operation to the database 400 to update the database 400 (S160). Then, the transmission network mass circuit relocation device 100 transmits the operation result to the support system 200, so that the changed circuit information in which the transmission network mass circuit is relocated in the support system 200 is generated (S170). Here, the changed line information includes the line device name / port / time slot of the changed section.

On the other hand, if it is confirmed in step S150 that the line relocation is not successful, the relocation work for the line is terminated and another line work is performed. The operation of the line that has not succeeded in the relocation of the line can be manually retried and rolled back after the automatic relocation of the remaining lines is completed.

Here, a method of generating a command for circuit relocation by the transmission network mass circuit relocation device 100 in step S140 will be described with reference to FIG. 4B.

As shown in FIG. 4B, the operation for relocating a transmission network is selected by selecting a circuit configuration section for newly configuring a circuit, a circuit switching section of a switching section to be switched among existing lines, and a circuit termination section in which an existing circuit is terminated. In addition, the transmission network mass circuit rearrangement apparatus 100 generates a command corresponding to the selected section and transmits the command to the nodes in the corresponding section, and then controls the nodes to execute in turn, thereby reconfiguring the circuit according to the command.

To this end, first, the transmission network bulk line relocation device 100 controls all nodes located in the circuit configuration section to simultaneously execute configuration commands generated by the transmission network bulk line relocation device 100 (S200).

For example, as shown in FIG. 3, Node A, Node B, Node C, and Node D currently constitute 'ABCD paths', and the circuit connected to Node C is rearranged through Node E to' Assume that you want to change to 'ABED path'. Then, Node A, Node B, Node E, and Node D, which are the entire configuration sections, simultaneously execute configuration commands, and Node C must execute the transfer command and the termination command sequentially.

The transmission network mass line relocation device 100 checks whether the node line configuration is successful according to simultaneous execution of the command (S201). The transmission network mass circuit rearrangement apparatus 100 transmits a command to nodes in need of configuration, and nodes receiving the command simultaneously execute a configuration command. The nodes transmit a success response response to the performed configuration command to the transport network bulk relocation device 100, respectively. If at least one node of the plurality of nodes that receives the configuration command fails to execute the configuration command, and transmits a timeout or configuration failure response to the transport network bulk relocation device 100, the transport network bulk relocation device 100 corresponds. The automatic relocation operation is terminated by recognizing a configuration failure for the line (S209).

However, if the circuit configuration of all the plurality of nodes is successful, the transmission network mass circuit relocation device 100 checks whether the number of switching lines is two or more lines in the switching section to be switched among the existing lines (S202). As a result of checking in step S202, when the transfer line is two or more lines, only the preset number of the transfer lines is controlled so that the transfer instruction is executed at the same time (S203).

For example, assume that a 10 Mbps Ethernet line is configured with five 2 Mbps lines between Node B and Node C as shown in FIG. In this case, the first half of the circuits are switched. For Ethernet circuits with the Link Capacity Adjustment Scheme (LCAS) set, only three circuits are deleted at 10M first, so that even if the circuit is relocated to another section, that is, to a node B-node E path, between node B and node C during the relocation time Two connected 2Mbps lines allow service to be continuously exchanged between the first terminal and the second terminal. Through this, the node B-node C-node D path may be rearranged to the node B-node E-node D without interrupting service provided to the terminal.

The transmission network mass circuit rearrangement apparatus 100 controls to simultaneously perform a circuit switching command on three circuits for devices corresponding to the switching interval, and then checks whether the circuit switching command is simultaneously performed on the three circuits (S204). Only when all commands to the devices corresponding to the transfer section succeed, the simultaneous execution of the transfer command is recognized as successful.

However, if a circuit change command is not performed on any one line, the network bulk circuit relocation device 100 recognizes the switchover failure and immediately performs rollback for all nodes corresponding to the switchover period (S210). In other words, if there are two or more transfer sections, the transfer status of the corresponding nodes should be the same. Therefore, if all nodes fail, determine whether the transfer is successful and perform automatic rollback when one of the nodes fails so that the previous line is not down. .

If it is confirmed in step S204 that the circuit switching is successful in the predetermined number of lines, the transmission network mass circuit relocation device 100 controls the circuit switching command to be executed simultaneously on the nodes of all switching intervals on the remaining lines (S205). . If the transfer command is not made in any one line, step S210 is performed.

However, if the transfer is successful, the transmission network mass circuit relocation device 100 processes the same for the termination section. That is, in order to be terminated all the lines in the termination section, the control is executed so that the termination command at the same time in all nodes of the termination section (S207).

The transmission network mass circuit rearrangement apparatus 100 checks whether the command is executed in all nodes in the termination period (S208). If the channel termination is successful, the transmission network mass circuit rearrangement apparatus 100 ends the operation. However, if the circuit termination command is not executed in any one node, the circuit is not terminated, and the automatic termination of the automatic relocation operation is determined as the termination failure (S211).

In a circuit in which only one circuit is switched, switching without line interruption is impossible. Therefore, in order to minimize the interruption period, the circuit interruption is minimized by simultaneously issuing a transfer command to the nodes in the transition period.

Next, a method of searching the entire line connection path of the work target line extracted in step S100 of FIG. 4A will be described with reference to FIG. 5.

5 is a flowchart of a method for searching a circuit path according to an embodiment of the present invention.

As shown in FIG. 5, in order to search for the end-to-end line, the transmission network mass line rearrangement apparatus 100 obtains port information for searching for the line input from the manager terminal 300 (S300). Then, the transmission network mass circuit relocation device 100 finds a connection path at the corresponding port (S301).

For example, assume that there is a connection path in the third E1 (2 Mbps) time slot of the first block (AUG1) of the 10 Gbps port. In order to find the end-to-end line of the corresponding line, the transmission network mass line rearrangement apparatus 100 first checks the connection level (signal level) of the line to be searched to determine whether a connection path actually exists in the port and time slot of the corresponding device (S302). ). If the connection information does not exist, the transmission network mass circuit relocation device 100 determines that the connection path does not exist and ends the circuit search procedure (S303).

However, if the connection information is present, the transmission network mass circuit rearrangement apparatus 100 designates both sides of the connection section in the first direction and the second direction, and searches for the connection path from the first direction.

The transmission network bulk line relocation apparatus 100 searches whether there is a physical link connected in the first direction (S304), and checks whether a physical link exists in the first direction (S305). If there is a physical link, the transmission network bulk circuit relocation device 100 checks the connection information for the corresponding time slot block (S308).

If there is the connection information, the transmission network mass circuit relocation device 100 checks whether the connection hierarchy for the time slot block matches the connection hierarchy in the first direction (S310). If there is a connection path of the same level as the first direction in the corresponding time slot, it may be selected in the first direction as it is and continue to follow the connection path (S311).

If the hierarchy is different, the hierarchy can be a larger hierarchy or a smaller hierarchy. In this case, it is assumed that there is a connection path of the hierarchy by creating a virtual time slot. And based on this information to find a connection path (S312). If there are no more physical links or connection paths to follow in the first direction, an end point in which the last selected level is the same as the first time slot is selected as an end point in the second direction (S306). Similarly to the first direction, the second direction performs steps S304 to S312 to find an end point of the second direction (S307).

An example for end-to-end searching by the method described above will be described with reference to FIG. 6.

6 is an exemplary diagram for end-to-end searching according to an embodiment of the present invention.

As shown in FIG. 6, it is assumed that the starting point of the end-to-end system has selected the third 2 Mbps time slot of the first block of the 10 Gbps physical link. The point is indicated as a 'start point' in FIG. 6.

First, E-2 is connected to E-1 point. In order to find the endpoint connected to E-1, the transmission network bulk relocation device 100 searches for the physical link and connection information associated with D. D-2 cannot follow as it has different levels (signal levels).

Assuming that there is a third 2Mbps time slot of the first block in the block of 155Mbps, it follows a specific time slot within the corresponding 155Mbps to find the connection path. It finds D-1 and follows the connection path again. In C, too, you must follow a virtual connection path.

In the system corresponding to Node B, since there is a time slot with a matching 2Mbps signal level, the corresponding path is found. Finally, the A-1 time slot is found and then terminated. At this time, since A-1 is a virtual time slot, the final A end point actually selected is selected as B-1. Similarly, the second point can be found in the same way and selected as F-2.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (4)

A method in which a mass circuit redeployment device redeploys a circuit in a transport network software defined network, the method comprising:
Extracting a connection path for at least one bulk circuit to be relocated,
Identifying a connection interval for a selected one of the at least one bulk circuit.
Dividing the arbitrary line into a constituent section, a transfer section, and a termination section, generating a separated section-specific command, and
Transferring the generated command to at least one node forming the arbitrary line, and controlling the command to be executed to rearrange the line.
Line relocation method comprising a. The method of claim 1,
Relocating the line,
Controlling a configuration command to be performed in at least one configuration node included in the configuration interval among all nodes located in the connection interval for the arbitrary circuit;
If the configuration command is executed simultaneously in the at least one configuration node, checking whether there are a plurality of circuits formed by the transfer node included in the transfer interval among all the nodes;
Transmitting a switching command to the switching node so that only a predetermined number of circuits of the plurality of circuits are switched if the plurality of circuits are plural;
When the preset number of circuits is switched, transferring and controlling a transfer command to the transfer node so that the remaining circuits of the plurality of circuits are switched; and
If all circuits formed at the transfer node are switched, controlling the termination node in the termination interval among all the nodes to execute the termination command;
Line relocation method comprising a. The method of claim 2,
If the configuration command is not executed in any of the configuration nodes, the automatic relocation operation is terminated due to the configuration failure for the line.
And if any one of the plurality of circuits is not switched, rollback is performed for all switching nodes corresponding to the switching interval. The method of claim 1,
Extracting the connection path,
Receiving port information for retrieving the line,
Checking whether connection information exists by checking a connection level of a line to be searched based on the port information;
If there is connection information, checking whether a physical link exists in a first direction in both directions of the connection section;
If there is a physical link, checking the connection information for the time slot block, and
If the connection information for the time slot block matches the connection level in the first direction, checking the connection path
Line relocation method comprising a.

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