KR102288042B1 - Method for protection switching service in virtual tenant network and controller - Google Patents

Abstract

Disclosed are a method and a controller for providing a virtual tenant network protection switching service. A protection switching service providing method according to an embodiment of the present invention proposes a technology for setting a real-time protection switching for a virtual tenant network path in order to provide reliability for a virtual tenant network service.

Description

{Method for protection switching service in virtual tenant network and controller}

The present invention relates to a virtual network technology, and more particularly, to a protection switching technology in a virtual network.

A virtual tenant network (VTN, hereinafter referred to as a VTN) refers to a virtual network of a tenant unit in which a user can configure and operate a desired network regardless of physical infrastructure. In order to provide a VTN service to a plurality of users in a software defined network (SDN, hereinafter referred to as SDN), a multi-tenancy-based network service must be provided. For example, when a user requests a VTN service from a controller of SDN, the controller maps a virtual network to a physical network located below and provides an independent network for each user so that data can be transmitted.

In a general network, a network connection service, for example, a dedicated line service and a protection switching service, is provided by a manual setting method of a network operator. Therefore, there is a limit in providing various network services in real time. Recently, SDN-based VTN technology is being developed to provide a real-time network connection service.

According to one embodiment, in order to improve the reliability of the VTN service, a controller for a VTN path and a real-time VTN protection switching service method are proposed.

A method of providing a protection switching service according to an embodiment includes receiving a protection switching setup request message for a path of a virtual tenant network from a client object, and analyzing the received protection switching setup request message so that a client object communicates with another client object. confirming that the protection switch group requests sharing of the protection switch group; and setting up a protection switch in which a plurality of client objects share a protection switch group when sharing is requested.

In the step of receiving the protection switching setting request message according to an embodiment, path characteristic information for the protection switching service, protection switching type, and protection switching setting selection information are received together from the client object, and the protection switching setting selection information is It includes whether to specify a group, whether to share the protection switching group, whether to use the exclusive use of the protection switching group, and whether to use the protection path when sharing the protection switching group.

According to an embodiment, the step of setting the protection switching exclusively using the protection switching group includes determining whether an existing protection switching group can be used if sharing of the protection switching group is not requested, and a new protection switching group must be used. In this case, it includes the steps of creating a new protection switching group and setting the protection switching, and if the existing protection switching group can be used as it is, setting the protection switching by adding a working path to the existing protection switching group.

In the step of determining whether the existing protection switching group can be used according to an embodiment, the existing protection switching group can be used by using path characteristic information, protection switching type, and protection switching setting selection information received from the client object. Determines whether a protection alternate group exists, whether the client object specifies a protection alternate group or uses an existing protection alternate group if there is one that can accommodate the working path, and creates a new protection alternate group if no one is available to decide

According to an embodiment, the step of creating a new protection switching group and setting the protection switching may include creating a new protection switching group and registering a working path and a protection path constituting the created protection switching group; requesting the server entity to establish a connection to the protection path, and setting a method for performing protection switching when a working path failure occurs.

In the step of setting the method for performing protection switching according to an embodiment, in the reactive protection mode, when a failure occurs in order to perform protection switching of the controller, the server entity is configured to notify the controller of a failure event. In the step of setting the method for performing protection switching according to another embodiment, in the proactive protection mode, when a failure occurs to perform protection switching of the server entity, it is set so that the server entity directly switches the working path to the protection path.

According to an embodiment, the step of setting the protection switching by adding a working path to the existing protection switching group includes adding the working path to the existing protection switching group, and performing protection switching of the controller in the reactive protection mode. The steps of setting the server object to notify the controller of a failure event when a failure occurs, and setting the server object to switch the working path to the protection path includes steps.

According to an embodiment, the step of setting the protection switching sharing the protection switching group includes: checking whether a plurality of clients sharing the protection switching group request to use the protection path; , decides whether the existing protection switching group can be used, creating a new protection switching group and setting the working path and protection path when a new protection switching group is to be used. adding a working path to the protection switching group of and setting the working path and the protection path, and adding the working path to the existing protection switching group when use of the existing protection switching group is available.

According to an embodiment, the step of setting the protection switching sharing the protection switching group includes notifying the client entity of a result of the protection switching setting when the protection switching setting is completed; and a working path identifier, protection path identifier, and protection switching group identifier , and notifying the client entity of protection switching information including protection switching type and protection switching group status information together.

The method of providing a protection switching service according to an embodiment further includes performing protection switching when a working path failure occurs.

The step of performing protection switching according to an embodiment includes receiving a failure event alarm message for protection switching from a server entity when a failure occurs in a working path in a reactive protection mode, and protection within the received failure event alarm message A step of looking up the routing information of the protection path corresponding to the working path in which the failure occurred by referring to the path information table using the switching information, the steps of switching the working path to the protection path by using the routing information of the protection path; and notifying the client entity that the has been performed.

The step of performing protection switching according to another embodiment includes: in the proactive protection mode, when a failure occurs in the working path, protection switching is performed on the server object without intervention of the controller, and receiving notification that the protection switching has been performed from the server object; and notifying the client entity that a protection switchover has been performed.

A method of providing a protection switching service according to an embodiment comprises the steps of: receiving a protection path use release message from a client object; The step of determining whether to delete the protection switching group, if it is possible to delete the protection switching group, it requests the server object passing through the protection path to release the protection path, deletes the protection switching group to which the protection path belongs from the path information table, and sends the result of the protection switching cancellation to the client The method further includes the steps of notifying the entity; and if the protection switching group is maintained as it is, deleting the protection path from the protection switching group of the path information table and notifying the client entity of the result.

A protection switching service providing method according to an embodiment includes the steps of: receiving a working path use release message from a client entity; The step of determining whether to delete the protection switching group, if it is possible to delete the protection switching group, it requests the server object passing through the protection path to release the protection path, deletes the protection switching group to which the protection path belongs from the path information table, and sends the result of the protection switching cancellation to the client The method further includes the step of notifying the entity, and if the protection switching group is maintained as it is, deleting the working path from the protection switching group of the path information table and notifying the client entity of the result.

The step of requesting release of use of the working path according to an embodiment includes the steps of requesting to release the alarm event for the working path to be released to the server object in the reactive protection mode, and to the server object in the proactive protection mode and requesting to cancel the protection switching setting.

A controller according to another embodiment includes a first interface connected to a client object requesting a protection switching service for a path of a virtual tenant network, a second interface connected to a server object providing a network infrastructure, a working path and protection A path calculation unit that calculates the routing path of a path, a protection switching control unit that manages a protection switching group consisting of a working path and a protection path, sets protection switching according to the request of a client object, and performs protection switching; and a storage unit in which a path information table providing path information for a path information is stored.

The controller according to an embodiment provides a protection switching service related to a virtual tenant network configured as a virtual network of a tenant unit in a software-defined network to a client entity.

In the path information table according to an embodiment, a working path and a protection path are mapped for each protection switching group.

The protection switching control unit according to an embodiment sets the protection switching so that the protection switching is performed in the physical network infrastructure, and as the protection switching is performed in the physical network infrastructure, the standardized protection switching protocol can be used as it is.

According to an embodiment, a real-time protection switching setting for a VTN path may be configured to provide reliability for a Virtual Tenant Network (VTN, hereinafter referred to as a VTN) service.

In addition, by using Proactive protection mode to set protection switching to be performed in the physical network infrastructure, it is possible to provide protection switching service while using the existing standardized Automatic Protection Switching (APS) as it is. can Furthermore, protection path groups can be shared between client entities to provide low-cost VTN protection switching services.

The present invention not only enhances the competitiveness of telecommunication service providers, but also enables users to receive reliable network services in real time, thereby increasing satisfaction such as service quality improvement and cost reduction.

1 is a conceptual diagram for explaining a protection switching model in a virtual tenant network (Virtual Tenant Network: VTN, hereinafter referred to as VTN);
2 is a conceptual diagram for explaining VTN protection switching when a plurality of client entities share a 1:n protection switching group;
3 is a detailed configuration diagram of a VTN protection switching system and a controller constituting the system according to an embodiment of the present invention;
4 is a flowchart illustrating a VTN protection switching setting process according to an embodiment of the present invention;
5 is a flowchart illustrating a protection switching group setting process according to an embodiment of the present invention;
6 is a flowchart illustrating a working path setting process according to an embodiment of the present invention;
7 is a flowchart illustrating a VTN protection switching setting process according to another embodiment of the present invention;
8 is a flowchart illustrating a process for performing protection switching when a working path failure occurs according to an embodiment of the present invention;
9 is a flowchart illustrating a protection transfer release process according to an embodiment of the present invention;
10 is a flowchart illustrating a protection transfer release process according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

1 is a conceptual diagram for explaining a protection switching model in a virtual tenant network (VTN, hereinafter referred to as a VTN).

A software defined network (SDN, hereinafter referred to as SDN) provides a virtual tenant network (VTN, hereinafter referred to as VTN) service so that users can receive network services in real time, unlike existing networks. The VTN service can configure, change, and release the real-time network according to the user's request.

The present invention provides a technique in which a user can configure a VTN protection switching service in real time in order to improve the reliability of the VTN service. In this case, when a working path (WP) failure occurs, protection switching in which a path is replaced by a protection path (PP) may be performed in the physical network infrastructure or may be set to be performed in the virtual network infrastructure. When protection switching is set to be performed in the physical network infrastructure, the protection switching service can be provided while using the existing standardized automatic protection switching protocol (APS).

Referring to FIG. 1 , the SDN-based VTN protection switching system includes a client entity 10 , a controller 12 , and a server entity 14 .

The number of client entities 10 may be plural, and for example, as shown in FIG. 1 , may be composed of n number of client entities 10-1, ..., 10-n. The number of server entities 14 may be plural. For example, as shown in FIG. 1 , it may be composed of n server entities 14-1, ..., 14-n.

The client entity 10 is a terminal possessed by a user and is located in an application plane that is a user plane to request and receive a VTN service. The controller 12 is located in a control plane to receive a request from the client entity 10 and control a physical network or a virtual network to provide a VTN service to the client entity 10 . The server entity 14 is located in the data plane and provides a physical network infrastructure or a virtual network infrastructure to the controller 12 .

The controller 12 provides a VTN service to the client entity 10 by controlling the physical or virtual network infrastructure provided from the server entity 14 . The server entity 14 provides a physical or virtual network infrastructure, and may be defined as a network such as multi-vendors, multi-domains, and multi-operators as well as network equipment. there is. When the client entity 10 requests the protection switching service for an arbitrary path in the VTN, the controller 12 sets the protection switching service in real time to the virtual or physical network infrastructure so that the protection switching service can be provided in real time.

When the client entity 10-1 according to an embodiment requests a protection switching service from the controller 12 for the VTN internal path AC, the controller 12 sends two server entities 14-1 and 14-n. Protection switching group (PG) containing working paths (A”,B”,D”,G”) and protection paths (A”,a, C”,E”,F”,G”) through ) constitutes After protection switching is set, if a working path fails, the working path is quickly switched to a protection path to minimize service interruption.

2 is a conceptual diagram for explaining VTN protection switching when a plurality of client entities share a 1:n protection switching group.

Referring to FIG. 2 , the protection switching group includes two working paths (path #1/path #2) and one protection path (path #3) owned by client object 1 (211), and client object 2 (212). Assume that it consists of one working path (path #1) owned by It is assumed that client entity 1 211 uses the protection path, and client entity 2 212 does not use the protection path and manages only state information. The controller 221 manages a protection switching group consisting of a protection path and a working path, sets protection switching for the protection path and the working path in the server entity, and manages routing path information passing through the server entities. Routing path information refers to a path through which data is actually transmitted for each VTN path of a client entity. Working path #1 in controller 221 corresponds to working path #1 of client entity 1 211 , and corresponds to path #1 through three server entities 201 , 202 and 203 .

The present invention relates to a protection switching setting technology for providing a VTN protection switching service (1+1, 1:1, 1:n, etc.) to multiple client entities, and satisfies the following requirements. For example, a 1:1 VTN protection switching service is provided in which one client object exclusively uses the protection switching group. As another example, a 1:n VTN protection switching service is provided in which a plurality of client entities share one protection switching group. At this time, when the client object requests to use the protected path, the protected path licensing service may be provided so that it can be used.

In case of a failure in the working path of the protection switching group, reactive protection mode is a method in which the controller directly performs protection switching, and Proactive protection is a method in which protection switching is performed in the server object. mode) Two methods are possible. In reactive protection mode, the controller presets a protection switching failure event to the server object, and then performs protection switching by receiving an event from the server object when a failure occurs. On the other hand, in the proactive protection mode, the controller sets the protection switching condition to the server object in advance, and when a failure occurs, the server object performs protection switching.

3 is a detailed configuration diagram of a VTN protection switching system and a controller constituting the system according to an embodiment of the present invention.

Referring to FIG. 3 , the VTN protection switching system includes a client entity 10 , a controller 12 and a server entity 14 .

In response to the protection switching service request of the client entity 10 , the controller 12 provides the protection switching service to the client entity 10 . The number of client entities 10 may be plural. For example, as shown in FIG. 3 , n client entities 10-1, 10-2, ..., 10-n may be configured. The server entity 14 provides the network infrastructure (working path and protection path) for protection switching to protection switching. The number of server entities 14 may be plural. For example, as shown in FIG. 1 , it may be composed of n server entities 14-1, 14-2, ..., 14-n.

The controller 12 according to an embodiment includes a first interface (North Band Interface, NBI) 121 , a second interface (South Band Interface, SBI) 122 , and a path computation element (PCE) 124 . ), a protection switching controller (PSC) 126 and a storage unit 128 . A path information table 1280 is stored in the storage unit 128 .

The first interface 121 provides an interface for connection with the client entity 10 . The second interface 122 provides an interface for connection with the server entity 14 . The path calculation unit 124 calculates routing paths of the protection path and the working path. The protection switching control unit 126 performs protection switching. The path information table 1280 provides path information for protection switching.

In the path information table 1280, mapping information of a working path (W) and a protection path (P) is stored for each protection switching group (1+1, 1:1, 1:n, etc.) . The mapping information is used for a quick protection switching service to the protection path in the event of a working path failure. The route information table 1280 according to an embodiment stores VTN internal route information and information for each protection switching group.

VTN internal route information includes routing information for VTN internal routes, bandwidth and class of service information for VTN internal routes, and the like. Routing information for a route inside the VTN is represented by the set of server entities that the route traverses. The bandwidth and class of service information for the VTN internal route shows the bandwidth and class of service for the route.

The information for each protection switching group includes the type of protection switching (1+1, 1:1, 1:n), protection path routing information, working path routing information, bandwidth and service class information for the working path and protection path, and head end ( head-end) and tail-end information, and the like. In the protection route routing information, the routing path for the server object through which the actual data is delivered for the protection path among the virtual paths inside the VTN for the protection switching service is displayed. In the working path routing information, the routing path for the server object through which the actual data is delivered for the working path among the virtual paths inside the VTN for the protection switching service is displayed. The head-end and tail-end information is information about a head-end and tail-end server entity in which working path monitoring and protection switching are performed, and corresponds to a server entity bridging the working path and protection path.

The identification information is used to set and release protection switching between the controller 12 , the client entity 10 , and the server entity 14 . The identification information includes protection path identification information, working path identification information, protection switching group identification information, path identification information, and the like.

The protection path identification information is information used to designate or identify a protection path between the controller 12, the client entity 10, and the server entity 14, and when the protection path is established, the controller 12 communicates with the client entity 10. to the server entity 14 . The working path identification information is information used to designate or identify a working path between the controller 12, the client entity 10, and the server entity 14, and the controller 12 communicates with the client entity 10 when setting the working path. to the server entity 14 . The protection switching group identification information is information used to designate or identify a protection switching group between the controller 12, the client object 10, and the server entity 14, and when the protection path is established, the controller 12 controls the client object 10 ) and the server entity 14 . The path identification information is used to mutually identify the VTN internal path between the controller 12, the client entity 10, and the server entity 14, and when the path is established, the controller 12 sends the client entity 10 and the server entity 14. provided to

4 is a flowchart illustrating a VTN protection switching setting process according to an embodiment of the present invention. In detail, FIG. 4 is a flowchart illustrating a VTN protection switching setting process when a protection switching group is exclusively used by one client entity.

In order for the client object to be provided with the protection switching service, the path through which the VTN service will be provided must first be established. When a client object requests the controller to establish a VTN route, the controller establishes a routing route to the server object, and then sends the route identification information and completion message to the client object. After the VTN route setting is completed, the client object requests the protection switching service from the controller, including the path information to be provided with the VTN protection switching service, the type of protection switching, and the following protection switching configuration selection information.

As an example of the protection switching setting selection information, a client entity may designate a protection switching group. To do this, the client object can ask the controller to establish a working path within an already existing protection switch group. To specify the protection switching group, the client entity can use the protection switching group ID. As another example, the client object may not specify a protection switching group. For example, a client object may not specify a protection switching group, and the controller may ask the controller to assign a protection switching group. As another example, a client entity may have exclusive use of a protection switching group. In this case, both the protection path and the working path included in the protection switching group are owned by a single client object. As another example, a client object may share and use a protection switching group with other client objects. In 1:n protection switching, multiple client objects share and use one protection switching group. In this case, the working paths owned by the client entities are included in one protection switching group, so that the client entities share the protection path. If the client objects share a protection switching group, you can choose whether to use the protection path or not.

Hereinafter, the VTN protection switching setting process in the case where one client entity exclusively uses the protection switching group will be described below with reference to FIG. 4 .

3 and 4 , the controller 12 receives a protection switching setting request message from a predetermined client entity through the first interface 121 . In this case, the working path and protection switching setting selection information may be received together from the client entity. The first interface 121 of the controller 12 transmits the received protection switching setting request message to the protection switching control unit 126 .

When the protection switching control unit 126 receives the protection switching setting request message from the first interface 121 (401), it analyzes the received protection switching setting request message and determines whether the client object wants to share the protection switching with another client object. Confirm (402). If the client object wishes to share the protection switch, go to step 700. A detailed process for step 700 will be described later with reference to FIG. 7 .

In contrast, if one client entity wants to exclusively use the protection switching group, the controller 12 determines whether to use the existing protection switching group as it is or to create a new protection switching group ( 403 ). The working path for the protection switching service must belong to a specific protection switching group, and the existing protection switching group can be used as it is or a new protection switching group can be created. The controller 12 according to an embodiment determines whether an existing protection switching group can be used by using the protection switching type, protection switching setting selection information, path characteristic information (bandwidth and service class), and the like. When a client object designates a specific protection switch group according to the protection switch setting selection information, the existing protection switch group is used. Also, even if there is a protection switching group that can accommodate the working path, the existing protection switching group is used. However, if there is no protection switching group available, a new protection switching group is created.

When using the existing protection switching group as it is, the controller 12 sets the protection switching by adding a working path to the existing protection switching group ( S421 ). The detailed process of step 421 will be described later with reference to FIG. 6 . Next, the controller 12 notifies the client entity of the protection switching setting result ( 422 ). At this time, such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths, etc.) Protection switching information can be notified together.

When a new protection switching group is used, the controller 12 creates a new protection switching group and registers a working path and a protection path in the path information table 1280 ( 411 ). The detailed process of step 411 will be described later with reference to FIG. 5 . When a client object exclusively uses a protection switching group, that client object has ownership (license) of the protection path. Next, the controller 12 notifies the client entity of the protection switching setting result ( 412 ). Protection switching such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths, etc.) inform information.

5 is a flowchart illustrating a protection switching group establishment process according to an embodiment of the present invention. In detail, FIG. 5 is a flowchart illustrating a protection switching group establishment process when a new protection switching group is created.

3 and 5 , the controller 12 calculates the routing path of the protection path that can satisfy the user's request without overlapping with the working path through the path calculation unit 124, and the protection switching control unit In step 126, a new protection switching group is created and a working path and a protection path are registered in the path information table 1280 (501).

The controller 12 then requests 502 the server entity 14 through which the protection path passes to establish a connection to the protection path. At this time, the controller 12 provides protection switching identification information including a protection switching group ID and a protection path ID so that the server entity 14 and the protection path can be mutually recognized, so that the server entity 14 is protected when the protection switching occurs. It is used to notify the controller 12 .

Next, the controller 12 sets a method for performing protection switching when a working path failure occurs ( 503 ). In this case, one of two methods, a reactive protection mode and a proactive protection mode, may be set by the network operator's selection.

In the reactive protection mode, the controller 12 requests the server entity 14 located at both endpoints (head-end and tail-end) of the working path to alarm a failure event when a failure to the working path occurs. The controller 12 provides path identification information including a protection switching group ID and a working path ID to the server entity 14 . When a failure event occurs in the working path, the server entity 14 transmits the working path ID, protection switching group ID, and failure event information in which the failure occurred to the controller 12 . Upon receiving the failure event alarm, the controller 12 refers to the path information table 1280 to look up the protection path and switches the working path to the protection path.

In the proactive protection mode, the controller 12 transmits the protection switching identification information including the protection switching group ID and the working path ID for protection switching to the server entity 14 located at both end points (head-end and tail-end) of the working path. provided to And when a working path failure occurs, the server entity 14 directly requests to switch the working path to a protection path. When the protection switchover is performed in the server entity 14, the controller 12 is notified that the protection switchover has been performed. At this time, the protection switching identification information including the protection switching group ID and the working path ID is also notified to the controller.

6 is a flowchart illustrating a working path setting process according to an embodiment of the present invention, and in detail, is a flowchart illustrating a working path setting process when an existing protection switching group is used.

3 and 6 , the controller 12 adds a working path for the protection switching service to the protection switching group of the path information table 1280 ( 601 ). Then, the controller 12 sets a method for performing protection switching when a working path failure occurs ( 602 ). In this case, one of two methods, a reactive protection mode and a proactive protection mode, may be set by the network operator's selection. Since the protection switching execution method setting 602 is set in the same manner as in step 503 described above with reference to FIG. 5 , a detailed description thereof will be omitted.

7 is a flowchart illustrating a VTN protection switching setting process according to another embodiment of the present invention. In detail, FIG. 7 is a flowchart illustrating a VTN protection switching setting process when a plurality of client entities share one protection switching group.

Referring to FIGS. 3 and 7 , the controller 12 determines whether client entities sharing one protection switching group request use of a protection path ( 701 ). When multiple client entities share the protection switching group and do not want to use the protection path, it is determined whether or not the protection switching group previously set for the working path requesting protection switching can be used ( 702 ). When a new protection switching group is to be used, a new protection switching group is created and a working path and a protection path are set (711). Step 711 may be performed by steps 501, 502, and 503 described above with reference to FIG. 5 . Next, the controller 12 notifies the client entity of the protection switching setting result ( 712 ). At this time, such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths, etc.) Protection switching information can be notified together.

On the other hand, when the client entity wants to use the existing protection switching group without a request for setting up a new protection switching group, the protection switching is set by adding a working path to the existing protection switching group ( 721 ). Step 721 may be performed by steps 601 and 602 described above with reference to FIG. 6 . Next, the controller 12 notifies the client entity of the protection switching setting result ( 722 ). At this time, protection such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths, etc.) Transfer information can be notified together.

On the other hand, in the step 701 of determining whether client objects sharing one protection switching group request the use of the protection path, if the client objects want to use the protection path, the working path requesting the protection switching is previously set. It is determined whether the existing protection switching group can be used (731). If it is necessary to create a new protection switching group, for example, if the protection path cannot be used while using the existing protection switching group because it is being used by another client object, create a new protection switching group and set the protection path and working path. Set (741). Step 741 may be performed by steps 501, 502, and 503 described above with reference to FIG. 5 . Next, the controller 12 notifies the client entity of the protection switching setting result (742). Protection such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (such as whether protection switching is used and the number of working paths) information, etc. Transfer information can be notified together. It can also notify the approval of the use of the protected route.

On the other hand, if the previously set protection switching group is available, it is checked whether the protection path is available (732). In addition, the protection switching is set (751). Step 751 may be performed by steps 601 and 602 described above with reference to FIG. 6 . Next, the controller 12 notifies the client entity of the protection switching setting result (752). Protection such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (such as whether protection switching is used and the number of working paths) information, etc. Transfer information can be notified together. It can also notify the approval of the use of the protected route.

On the other hand, if it is not possible to use the protection path, a new protection switching group is created and a protection path and a working path are set ( 741 ). Step 741 may be performed by steps 501, 502, and 503 described above with reference to FIG. 5 . Next, the controller 12 notifies the client entity of the protection switching setting result (742). Protection such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (such as whether protection switching is used and the number of working paths) information, etc. Transfer information can be notified together. It can also notify the approval of the use of the protected route.

8 is a flowchart illustrating a process for performing protection switching when a working path failure occurs according to an embodiment of the present invention.

3 and 8 , the controller 12 may perform protection switching in two methods, a reactive protection mode and a proactive protection mode.

In the case of the reactive protection mode, when a failure occurs in the working path, the controller 12 receives a failure event alarm message for protection switching from the server entity 14 (801). In this case, the protection switching group ID, the working path ID, and the protection switching information including the fault event type may be received together. The controller 12 receives the failure event alarm message from the server entity 14 through the second interface 122 and transmits it to the protection switching control unit 126, and the protection switching control unit 126 analyzes the received message. .

The protection switching control unit 126 of the controller 12 uses the protection switching information in the received message to refer to table information for each protection switching group, and routing information (head-end and tail-end server) of the protection path corresponding to the faulty working path. entity information) is looked up (802). Then, the protection switching control unit 126 requests the head-end and tail-end server entities to switch the working path to the protection path ( 803 ). The controller 12 then notifies the client entity 10 that the protection switchover has been performed (804). At this time, such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths, etc.) Notifications may be included with protection switching information.

In the case of the proactive protection mode, when a failure occurs in the working path, the server entity 14 automatically performs protection switching without intervention of the controller 12 . In this case, the protection switching control unit 126 of the controller 12 is notified that the protection switching has been performed from the server entity 14 through the second interface 122 ( 811 ). The received protection switching notification message may include protection switching group ID and working path ID information. Then, the controller 12 notifies the client entity 10 that the protection switchover has been performed ( 812 ). At this time, protection switching such as working path ID, protection path ID, protection switching group ID, protection switching type (1+1, 1:1, 1:n), protection switching group status information (whether protection switching is used and the number of working paths) information can be shared.

9 is a flowchart illustrating a protection transfer release process according to an embodiment of the present invention, and is a flowchart illustrating a protection transfer release process for a protection path in detail.

There are two types of protection transfer release. The first is a case in which the client entity 10 provides the controller 12 with protection switching group ID and working path ID information to request release of protection switching for the working path. The second case is when the client object 10 provides the protection switching group ID and protection path ID information to the controller 12 to release only the protection path use. A protection switch release process for the protection path will be described later with reference to FIG. 9 , and a protection switch release process for the working path will be described later with reference to FIG. 10 .

3 and 9 , the controller 12 receives a protection path use release message including protection switching group ID and protection path ID information from the client entity 10 through the first interface 121 (901) ). The received message is transmitted to the protection switching control unit 126 of the controller 12 .

The protection switching control unit 126 refers to the protection switching group ID and protection path ID information in the received message, and the head-end and tail-end server objects of the protection path in the path information table 1280 . look up information Then, the head-end and tail-end server entities are requested to release use of the protection path used by the client entity 10 ( S902 ).

Next, the protection switching control unit 126 determines whether to delete the protection switching group ( S903 ). If there is no working path and none of the protection paths in use in the protection switching group, the protection switching group can be deleted. To delete the protection switching group, the protection switching control unit 126 instructs the server object passing the protection path to release the protection path, deletes the protection switching group to which the protection path belongs from the path information table 1280, and displays the result. Notifies the client entity (904). On the other hand, when the protection switching group is maintained, the protection switching control unit 126 deletes the protection path from the protection switching group of the path information table 1280 and notifies the client entity of the result (905).

10 is a flowchart illustrating a protection transfer release process according to another embodiment of the present invention, and in detail, is a flowchart illustrating a protection transfer release process for a working path.

3 and 10 , the controller 12 receives a working path release message including protection switching group ID and working path ID information from the client entity 10 through the first interface 121 . The received message is transmitted to the protection switching control unit 126 of the controller 12 .

The protection switching control unit 126 looks up head-end and tail-end server entity information of the working path from the path information table 1280 with reference to the protection switching group ID and the working path ID in the received working path release message. And it requests the server entity 14 to release the working path ( 1002 ). It can operate according to two types of protection switching setting methods. In the reactive protection mode, the server object 14 is requested to release the alarm event for the working path to be released, and in the proactive protection mode, the server object 14 is requested to be released. ) to cancel the protection transfer setting.

Next, it is determined whether to delete the protection switching group ( 1003 ). If there is neither a working path nor a protection path in the protection switching group, the protection switching group can be deleted. In order to delete the protection switching group, the protection switching control unit 126 requests the server entity 14 passing through the protection path to release the protection path, and deletes the protection switching group to which the protection path belongs from the path information table 1280. , notifies the client entity 10 of the result of canceling the protection switching ( 1005 ). On the other hand, if the protection switching group is maintained, the protection switching control unit 126 deletes the working path from the path information table 1280 and notifies the client entity 10 of the result ( 1004 ).

The client entity 10, the controller 12, and the server entity 14 use the protection switching group ID, the protection path ID, and the working path ID to synchronize the state information for each protection switching group. That is, when a periodic update message or the status of the protection switching group is changed, the status message is frequently exchanged to synchronize the status information of the protection switching group.

So far, the present invention has been looked at focusing on the embodiments thereof. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

10: client object 12: controller
14: server object 121: first interface
122: second interface 124: path calculation unit
126: protection switching control unit 128: storage unit
1280: route information table

Claims (20)

receiving a protection switching setup request message for a path of a virtual tenant network from a client entity;
analyzing the received protection switching setup request message to determine whether a client object requests sharing of a protection switching group with another client object;
if the client object does not request to share the protection switching group, establishing protection switching in which a single client object exclusively uses the protection switching group; and
When a client object requests to share a protection switching group, setting a protection switching in which a plurality of client objects share a protection switching group;
The steps of setting the protection switching group exclusively using the protection switching group are:
determining whether an existing protection switching group can be used or whether a new protection switching group should be used if the protection switching group sharing is not requested;
setting the protection switching by creating a new protection switching group when it is necessary to use a new protection switching group; and
setting protection switching by adding a working path to the existing protection switching group when the existing protection switching group can be used as it is;
Protection switching service providing method comprising a. The method of claim 1, wherein the step of receiving the protection switching setup request message comprises:
Receives path attribute information for protection switching service, protection switching type, and protection switching setting selection information from the client object together,
The protection switching setting selection information includes whether a protection switching group is specified, whether the protection switching group is shared, whether the protection switching group is used exclusively, and whether a protection path is used when the protection switching group is shared. delete The method of claim 1, wherein determining whether to use the existing protection switching group comprises:
Determines whether an existing protection switch group can be used by using the path attribute information, protection switch type, and protection switch setting selection information received from the client object;
When the client object specifies a protection alternate group or there is a protection alternate group that can accommodate the working path, it decides to use the existing protection alternate group, and if there is no protection alternate group available, it decides to create a new protection alternate group. How to provide protection switching service. The method of claim 1, wherein the setting of the protection switching by creating the new protection switching group comprises:
creating a new protection switching group and registering a working path and a protection path constituting the created protection switching group;
requesting a server object through which the protection path passes to establish a connection to the protection path; and
setting a method for performing protection switching when a working path failure occurs;
Protection switching service providing method comprising a. The method of claim 5, wherein the setting of the protection switching method comprises:
A method of providing a protection switching service, characterized in that, in the reactive protection mode, the server entity sets an alarm event to the controller when a failure occurs in order to perform protection switching of the controller. The method of claim 5, wherein the setting of the protection switching method comprises:
A method of providing a protection switching service, characterized in that in the proactive protection mode, the server object directly switches the working path to the protection path when a failure occurs in order to perform the protection switching of the server object. The method of claim 1, wherein the step of setting protection switching by adding a working path to the existing protection switching group comprises:
adding a working path to an existing protection switching group;
In the reactive protection mode, setting the server entity to notify the controller of a failure event when a failure occurs in order to perform protection switching of the controller; and
In the proactive protection mode, setting the server object to directly switch the working path to the protection path when a failure occurs to perform protection switching of the server object;
Protection switching service providing method comprising a. receiving a protection switching setup request message for a path of a virtual tenant network from a client entity;
analyzing the received protection switching setup request message to determine whether a client object requests sharing of a protection switching group with another client object;
if the client object does not request to share the protection switching group, establishing protection switching in which a single client object exclusively uses the protection switching group; and
When the client object requests to share the protection switching group, setting the protection switching in which a plurality of client objects share the protection switching group;
The step of setting the protection switching sharing the protection switching group comprises:
checking whether a plurality of clients sharing the protection switching group request to use the protection path;
If you do not request to use a protection path, determine whether an existing protection switching group can be used. If a new protection switching group needs to be used, create a new protection switching group, set the working path and protection path, adding a working path to an existing protection switching group if the switching group is available; and
When requesting to use a protection path, it determines whether the existing protection switching group can be used or not. adding a working path to an existing protection switching group if use of a switching group is available;
Protection switching service providing method comprising a. 10. The method of claim 9, wherein the step of setting the protection switch sharing the protection switch group comprises:
notifying the client object of the result of the protection switching setting when the protection switching setting is completed; and
notifying the client entity of protection switching information including the working path identifier, the protection path identifier, the protection switching group identifier, the protection switching type, and the protection switching group status information together;
Protection switching service providing method comprising a. The method of claim 1, wherein the protection switching service providing method comprises:
performing protection switching in the event of a working path failure;
Protection switching service providing method, characterized in that it further comprises. The method of claim 11 , wherein performing the protection switching comprises:
In the reactive protection mode, when a failure occurs in the working path, receiving a failure event alarm message for protection switching from the server entity;
using the protection switching information in the received failure event alarm message to refer to a path information table to look up routing information of a protection path corresponding to a working path in which a failure occurs;
switching a working path to a protection path using routing information of the protection path; and
notifying the client entity that a protection switchover has been performed;
Protection switching service providing method comprising a. The method of claim 11 , wherein performing the protection switching comprises:
In the proactive protection mode, when a failure occurs in the working path, protection switching is performed on the server object without the intervention of a controller, and receiving notification from the server object that the protection switching has been performed; and
notifying the client entity that a protection switchover has been performed;
Protection switching service providing method comprising a. The method of claim 1, wherein the protection switching service providing method comprises:
receiving a protection path disable message from the client object;
requesting the server object to disable the protection path being used by the client object;
determining whether to delete the protection switching group or to keep the protection switching group;
if it is possible to delete the protection switching group, requesting the server object passing through the protection path to release the protection path, deleting the protection switching group to which the protection path belongs from the path information table, and notifying the client object of the result of canceling the protection switching; and
if the protection switching group is maintained, deleting the protection path from the protection switching group in the path information table and notifying the client object of the result;
Protection switching service providing method, characterized in that it further comprises. The method of claim 1, wherein the protection switching service providing method comprises:
receiving a working path release message from the client entity;
requesting the server object to release the working path being used by the client object;
determining whether to delete the protection switching group or to keep the protection switching group;
if it is possible to delete the protection switching group, requesting the server object passing through the protection path to release the protection path, deleting the protection switching group to which the protection path belongs from the path information table, and notifying the client object of the result of canceling the protection switching; and
if the protection switching group is maintained, deleting the working path from the protection switching group in the path information table and notifying the client object of the result;
Protection switching service providing method, characterized in that it further comprises. The method of claim 15, wherein the step of requesting release of use of the working path comprises:
requesting the server object to clear the alarm event for the working path to be cleared in reactive protection mode; and
requesting the server object to cancel the protection switching setting in the proactive protection mode;
Protection switching service providing method comprising a. a first interface connected to a client object that requests a protection switching service for a path of a virtual tenant network or requests release of use of a protection path;
a second interface connected to a server object providing a network infrastructure or releasing a protection path used by a client object;
a path calculation unit for calculating a working path and a routing path of the protection path;
It manages the protection switching group consisting of the working path and the protection path, sets protection switching according to the request of the client object, performs protection switching, and receives a request to cancel the use of the protection path from the client object, and determines whether to delete the protection switching group. a protection switching control unit to determine; and
A path information table providing path information for protection switching is stored, and according to the decision of the protection switching control unit, the protection switching group to which the protection path belongs is deleted from the path information table or the protection path is selected from the protection switching group of the path information table. storage to delete;
Virtual tenant network controller comprising a. 18. The method of claim 17, wherein the controller is
The virtual tenant network controller according to claim 1, wherein in the software-defined network, a protection switching service related to a virtual tenant network composed of a virtual network of each tenant is provided to the client entity. 19. The method of claim 18,
A virtual tenant network controller for protection switching in a virtual tenant network, wherein a working path and a protection path are mapped for each protection switching group in the path information table. 19. The method of claim 18, wherein the protection switching control unit
A virtual tenant network controller, characterized in that the standardized protection switching protocol can be used as it is by setting the protection switching so that the protection switching is performed in the physical network infrastructure and performing the protection switching in the physical network infrastructure.

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