KR101965402B1 - Controller based protection apparatus and method for software defined network - Google Patents

Controller based protection apparatus and method for software defined network Download PDF

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Publication number
KR101965402B1
KR101965402B1 KR1020150071821A KR20150071821A KR101965402B1 KR 101965402 B1 KR101965402 B1 KR 101965402B1 KR 1020150071821 A KR1020150071821 A KR 1020150071821A KR 20150071821 A KR20150071821 A KR 20150071821A KR 101965402 B1 KR101965402 B1 KR 101965402B1
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path
protection
network
working path
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KR1020150071821A
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Korean (ko)
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KR20160106467A (en
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윤빈영
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한국전자통신연구원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/06—Generation of reports

Abstract

A controller-based protection device and method for a software defined network is provided. The network protection device includes a controller for performing protection switching on at least one working path in a Software Defined Network (SDN) and a first event in which the protection switching is performed, And may include a processor that establishes a protection path in advance before it occurs.

Description

[0001] CONTROLLER BASED PROTECTION APPARATUS AND METHOD FOR SOFTWARE DEFINED NETWORK [0002]

Relates to the field of protection of networks, and more particularly to protection devices and methods of software defined networks (SDN).

In terms of network protection requirements, there is a 50ms protection requirement for network protection based on the fact that if a failure of the voice connection is corrected within 50ms, the person is not aware of the failure. However, the 50ms protection requirement was derived in an age when most network traffic was focused on voice. Today, there are various types of application services, including data, streaming and video, and as a result, the need for 50ms protection requirements is becoming smaller and smaller.

On the other hand, SDN technology is evolving to provide improved scalability, reliability and agility when compared to conventional networks. There is a new need for controller-based protection devices and methods that enable SDNs to provide high availability and small latency in such environments. In addition, this controller-based protection method can improve the reliability of the network and can be expected to be used in various forms.

According to one side, a protection device of a software defined network (SDN) is provided. Wherein the protection device of the software defined network comprises a controller for performing protection switching on at least one working path in a software defined network and a controller for setting a first event in which the protection switching is performed, And may include a processor for establishing a protection path in advance. In addition, the processor may perform the protection switching by setting the protection path to a new working path when the first event occurs.

According to another aspect, a method of protecting a software defined network is provided. Wherein the protection method of the software defined network comprises establishing a protection switching method corresponding to each of the at least one level network protection devices disposed in at least one working path connecting the consumer virtual network and the physical network, The at least one level network protection device in the first working path may perform the set protection switching method when a message relating to an operational fault is received from the first working path in the path.

According to one embodiment, configuring the protection switching method may include setting an event that occurs in the at least one working path to the operational fault. In addition, the step of setting the protection switching method may further comprise setting a protection path in advance before receiving the message associated with the operation failure. In addition, the step of performing the protection switching method may perform the protection switching by setting the protection path as a new working path when the message is received.

According to another embodiment, the step of performing the protection switching may include a step of, when receiving the message, determining a restoration path in the at least one working path and setting the restoration path as a new working path to perform protection switching Step < / RTI > In addition, one of the at least one working path may be determined as the restoration path corresponding to a predetermined setting value.

According to yet another embodiment, the method of protecting a software defined network separates the at least one working path into a sub-connection in the same domain and an inter-connection that connects between neighboring domains Step < / RTI > In addition, the step of setting the protection switching method may respectively set the first protection switching method corresponding to the sub-connection and the second protection switching method corresponding to the inter-connection, respectively. The step of performing the protection switching method may further include performing protection switching according to the first protection switching method when receiving the message associated with the sub-connection, receiving the message associated with the inter-connection The protection switching can be performed according to the second protection switching method.

According to another aspect, a method of protecting a software defined network is provided. Said method comprising: establishing a first event in which protection switching is performed on at least one working path in a software defined network; and setting a protection path for said at least one working path in advance May be established. In addition, the protection method of the software defined network may further include, when the first event occurs, performing the protection switching by setting the protection path as a new working path.

According to one embodiment, the protection method of the software defined network comprises setting a second event occurring in the at least one working path and determining a restoration path in the software defined network when the second event occurs The method comprising the steps of: In addition, the step of determining the restoration path may determine the first working path corresponding to the predetermined set value among the at least one working path as the restoration path.

1A and 1B are block diagrams illustrating a network protection apparatus according to one embodiment.
2 is a block diagram illustrating a network protection apparatus according to one embodiment.
3 is an exemplary diagram illustrating a multi-level network protection apparatus in accordance with one embodiment.
4 is a block diagram illustrating a method of protecting a software defined network according to one embodiment.
5 is a block diagram illustrating a method of protecting a network in a multi-domain according to one embodiment.
6 is a block diagram illustrating a network protection method for a transport network.

In the following, some embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the present invention is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

The terms used in the following description are chosen to be generic and universal in the art to which they are related, but other terms may exist depending on the development and / or change in technology, customs, preferences of the technician, and the like. Accordingly, the terminology used in the following description should not be construed as limiting the technical thought, but should be understood in the exemplary language used to describe the embodiments.

Also, in certain cases, there may be a term chosen arbitrarily by the applicant, in which case the meaning of the detailed description in the corresponding description section. Therefore, the term used in the following description should be understood based on the meaning of the term, not the name of a simple term, and the contents throughout the specification.

FIGS. 1A and 1B illustrate an example of a network protection apparatus according to an exemplary embodiment of the present invention. 1A, a network protection device 100, a node A 110, a Node B 120, a working path 130 and a protection path 140 are shown. According to one embodiment, the network protection device 100 may create a protection path 140 and a working path 130 connecting the node A 110 and the node B 120. More specifically, the working path 130 and the protection path 140 may be created in a data plane that constitutes a software defined network. However, the network protection apparatus 100 according to the present invention may generate the protection path 140 in advance before a specific event corresponding to the path failure occurs in the working path 130. Therefore, it is possible to expect an effect that the network user is assured of higher availability.

Referring to FIG. 1B, a specific event 150 occurring on the working path 130 is shown. The network protection device 100 may set the specific event 150 as a path failure. Illustratively, the specific event 150 may be any one of a signal failure (SF), manual switching (MS), and forced switching (FS). In addition, the network protection apparatus 100 can perform protection switching in the event of a path failure on the working path 130. In one embodiment, the network protection device 100 may receive a message of a path failure corresponding to a particular event 150 from the working path 130. In addition, the protection switching performed by the network protection apparatus 100 may be to designate the protection path 140 as a new working path.

2 is a block diagram illustrating a network protection apparatus according to one embodiment. According to one embodiment, the network protection apparatus 200 includes a control unit 210 and a processor 220. The network protection apparatus 200 sets an event occurring in the working path as a path failure and protects the network by performing a protection switching in the event of a path failure. By way of example, the network may be a software defined network.

The control unit 210 may perform protection switching for at least one working path in the software defined network. More specifically, the protection switching may be to replace the first working path where the path failure occurs with a predetermined protection path.

Processor 220 may set a first event for performing protection switching. Illustratively, the first event may be any event that may occur in the process of transmitting and receiving data within the first working path. In addition, the processor 220 may set a protection path for performing protection switching in advance before the first event occurs. The processor 220 may perform the protection switching by setting the protection path to a new working path when the first event occurs. Since the processor 220 sets a protection path in advance before the first event occurs, the processor 220 can guarantee high availability to users of the network.

In another embodiment, the processor 220 may set a second event that occurs within at least one working path. Processor 220 may determine a recovery path in a software defined network if a second event occurs. More specifically, the processor 220 may determine one of the at least one working path as a recovery path corresponding to a predetermined set value. The setting value may be input from the user via the network protection device 200. [ A setting value for determining a specific restoration path may be specified according to the requirements of the user. Illustratively, the setting value may be a value that is specified to have a minimum delay time for connection among the at least one working path. In such a case, the processor 220 can set the optimal working path to the recovery path, allowing the operator of the network to spend less.

3 is an exemplary diagram illustrating a multi-level network protection apparatus according to one embodiment. 3, a plurality of customer nodes 311, 312 and 313 are connected to a plurality of physical networks 331, 332 and 333 through multi-level network protection devices 321, 322 and 323 Network is shown. Illustratively, in the present embodiment, three consumer virtual networks 311, 312 and 313, three levels of network protection devices 321, 322 and 323, and three physical networks 331, 332 and 333 are implemented Although the embodiment is shown, it is to be understood that the scope of the present invention is not limited to the number shown in the present embodiment but can be extended to at least one customer virtual network, at least one network protection apparatus, and at least one physical network, It will be obvious to those skilled in the art.

Each of the plurality of consumer virtual networks 311, 312 and 313 may be connected to any one of the plurality of physical networks 331, 332 and 333 and may be connected to the network protection devices 321, 322, Of the Convention. Illustratively, each of the plurality of consumer virtual networks 311, 312, and 313 may include at least one virtual node.

To protect the connection path, a multi-level network protection device can set each protection method according to each level of network protection device. In addition, the multi-level network protection device may configure each network protection method independently of the last connected physical network 331, 332, 333. In one embodiment, the network protection method may be one of a controller-based network protection method and a controller based restoration method. More specifically, in the case where the controller-based network protection method is set, the multi-level network protection devices 321, 322, and 323 can expect an effect of achieving high connectivity and low latency.

Illustratively, assume that the first level network protection device 321 has selected a controller-based network protection method for network protection between the first consumer virtual network 311 and the first physical network 331 lets do it. The first level network protection device 321 may set a plurality of events that can be recognized as a path failure within the current working path 341. [ In addition, the first-level network protection device 321 may set a protection path 342 for performing protection switching in advance before any one of a plurality of events occurs. In addition, when a path fault is reported within the working path 341, the first level network protection apparatus 321 may set the protection path 342 to a new working path to perform protection switching. The first level network protection device 321 may enable network protection by allowing the first customer virtual network 311 to utilize a predetermined protection path 342 for data transmission and reception in case of a path failure.

In another embodiment, when the third network protection device 323 has selected a controller-based network restoration method for network protection between the connection of the second level consumer virtual network 312 and the second physical network 332 . If a path failure 352 is reported within the currently working working path 351, the third level network protection device 323 may perform path computation for path recovery. Depending on the outcome of the path calculation, the third level network protection device 323 may set a new working path 353 to allow the network to operate. The new working path 353 may be the path that is fastest or most cost-effective to reflect the current network environment. Thus, the third level network protection device 323 may perform a low cost network protection method.

4 is a block diagram illustrating a method of protecting a software defined network according to one embodiment. A method of protecting a software defined network (400) includes deploying (410) at least one level network protection device, establishing (420) a protection switching method corresponding to the at least one level network protection device And if the message related to the operation failure is received, performing the set protection switching method (430).

Step 410 is where each of the at least one level network protection device is placed on at least one working path in the software defined network. More specifically, the at least one working path may be a path connecting at least one consumer virtual network to at least one physical network. In addition, in step 410, each of the at least one level network protection device may be located at a particular level within at least one working path and arranged in a multi-level structure.

Step 420 is to establish a protection switching method corresponding to each of the at least one level network protection devices. More specifically, the protection switching method can be any one of a controller-based network protection method and a controller-based network restoration method. In addition, step 420 may include setting an event that may occur within at least one working path to an operational failure. Illustratively, the event can be either a failure occurrence, a manual transfer, or a forced transfer. In one embodiment, if a controller-based network protection method is configured, step 420 may further comprise establishing a protection path in advance before receiving a message associated with an operational failure.

Step 430 is a step of performing the set protection switching method when receiving a message related to an operation failure from the working path. Illustratively, when a message associated with an operational fault is received from a first working path in at least one working path, at least one level network protection device in the first working path can perform a protection switching method. In one embodiment, if a controller-based network recovery method is configured in step 420, step 430 determines a recovery path in at least one working path when receiving a message associated with an operational failure, And performing the protection switching by setting the determined restoration path as a new working path. More specifically, step 430 may determine, as a restoration path, one working path having a minimum delay time for connection among at least one working path. In another embodiment, if a controller-based network protection method is configured in step 420, then in step 430, upon receiving a message associated with an operational failure, step 430 sets the protection path to a new working path, . ≪ / RTI >

5 is a block diagram illustrating a method of protecting a network in a multi-domain according to one embodiment. A network protection method 500 in a multi-domain includes separating 510 a working path into either a sub-connection and an inter-connection, respectively, and a first protection corresponding to the sub- And setting (520) a second protection switching method corresponding to the switching method and the inter-connection.

Step 510 is a step of separating at least one working path in the software defined network into either one of sub-connection and inter-connection, respectively. In one embodiment, the sub-connection may be a working path that exists in the same domain. In another embodiment, the inter-connection may be a working path connecting between different neighboring domains. Within a software defined network, the consumer virtual network may request network protection for connection to the physical network. In addition, the multi-domain may be a network in which there is a working path connecting different domains within a software defined network. However, there are nodes in the multi-domain that use different network policies, network device vendors and protocols to implement the same network protection method in end-to-end connection Difficulties exist. Accordingly, the network protection method of the present invention can provide a method for separating at least one working path into either one of sub-connection and inter-connection, respectively, so that different network protection methods can be performed.

Step 520 is a step of setting a first protection switching method corresponding to the sub-connection and a second protection switching method corresponding to the inter-connection, respectively. In step 520, either the controller-based network protection method or the controller-based restoration method may be selected for the first protection switching method and the second protection switching method according to the network environment. As described above, the network protection method of the present invention can set each network protection method considering the difference of the network policy, the network device manufacturer, and the protocol of each working path, The problem of the network protection method in the multi-domain network of Fig.

Step 520, when receiving a message of an operational fault associated with the sub-connection, performs a protection switching in accordance with the first protection switching method, and if a message of operational failure associated with the inter- 2 protection switching method according to the protection switching method.

6 is a block diagram illustrating a network protection method for a transport network. A network protection method 600 for a transport network includes establishing (610) a protection switching method for a transport network connected to a first level network protection device of at least one level network protection device, (Step 620). ≪ RTI ID = 0.0 > The network protection method 600 for the transport network can provide higher availability to the L3 layer for the router. It is possible to set a protection switching method corresponding to each of the transmission networks transmitting IP (Internet Protocol) packets, thereby ensuring high availability. A multiprotocol generally includes several domains, and the protocol used may be different for each domain. In such a case, there may exist domains using different protocols on one working path. Therefore, there is a need to separate intervals using the same protocol. This is because the paths using different protocols are different from the OAM (Operations, Administration and Maintenace) protocols, and failures can not be detected. Therefore, the following embodiment is provided.

Step 610 is the step of establishing a protection switching method for the transport network connected to the first level network protection device from at least one level network protection device present in the software defined network. In one embodiment, the transport network may be an IP (Internet Protocol) over Ethernet (Ethernet) network. In another embodiment, the transport network may be an IP over MPLS-TE (Multi-Protocol Label Switching-Traffic Engineering) network. In yet another embodiment, the transmission network may be an IP over WDM (Wavelength Division Multiplexing) network. Although the above description describes embodiments of three transmission networks, it is not intended to limit or limit the scope of the present invention, and the transmission network of the above description may be any of the various types of protocols used for data transmission and reception today . In addition, the protection switching method can be either a controller-based network protection method or a controller-based network restoration method.

Step 620 is a step of performing a protection switching method corresponding to the transmission network. More specifically, step 620 may perform a protection switching method corresponding to the transport network in the event that a message of operational failure is received within at least one working path connecting the transport network. The controller-based network protection method and the controller-based network restoration method can be applied as described above.

The embodiments described above may be implemented in hardware components, software components, and / or a combination of hardware components and software components. For example, the devices, methods, and components described in the embodiments may be implemented within a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array such as an array, a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing apparatus may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced. Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (20)

An SDN control unit for performing protection switching on at least one working path connecting nodes in a Software Defined Network (SDN); And
A processor for setting a protection path in advance before the first event occurs,
Lt; / RTI >
Wherein the SDN control unit obtains information occurring on the at least one working path and performs protection switching directly to the at least one working path when a path fault occurs on the at least one working path. The method according to claim 1,
Wherein the processor sets the protection path to a new working path when the first event occurs, thereby performing the protection switching. The method according to claim 1,
Wherein the processor sets a second event that occurs within the at least one working path and determines a recovery path within the software defined network if the second event occurs. The method of claim 3,
Wherein the processor determines one restoration path as the working path corresponding to a predetermined set value among at least one restoration path. delete delete delete delete delete delete delete delete delete delete delete delete Establishing a first event in which protection switching is performed on at least one working path through which the SDN control unit connects nodes in a software defined network;
The processor establishing a protection path for the at least one working path before the first event occurs; And
Wherein the SDN control obtains information occurring on the at least one working path and performs protection switching directly to the at least one working path when a path fault occurs on the at least one working path
The method comprising the steps of: 18. The method of claim 17,
When the first event occurs, performing the protection switching by setting the protection path as a new working path
Further comprising the steps of: 18. The method of claim 17,
Establishing a second event occurring within the at least one working path; And
Determining a restoration path in the software defined network when the second event occurs;
Further comprising the steps of: 20. The method of claim 19,
Wherein the step of determining the restoration path determines the first restoration path as the working path corresponding to a preset value among at least one restoration path.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150043383A1 (en) 2013-08-07 2015-02-12 Telefonaktiebolaget L M Ericsson (Publ) Automatic establishment of redundant paths with cautious restoration in a packet network
US20160020942A1 (en) 2014-07-16 2016-01-21 Mandar Joshi Linear path protection in a centralized controller environment

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Publication number Priority date Publication date Assignee Title
KR101587258B1 (en) * 2012-09-07 2016-01-20 한국전자통신연구원 Method and appratus for protection switching

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150043383A1 (en) 2013-08-07 2015-02-12 Telefonaktiebolaget L M Ericsson (Publ) Automatic establishment of redundant paths with cautious restoration in a packet network
US20160020942A1 (en) 2014-07-16 2016-01-21 Mandar Joshi Linear path protection in a centralized controller environment

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