KR20110046837A - Method for managing network based on data distribution service - Google Patents

Abstract

PURPOSE: A method for managing network based on data distribution service is provided to manage a network in real time through a rapid transmission of network management information which is for network management in an Ethernet base public network and a indoor environment of a client. CONSTITUTION: A network management topic about a network management data generating on a network is set(602). At least one subject among the set subjects is subscribed(604). Network management data coinciding to the subscribed subject is posted by the set subject in real time(606). The network management data coinciding with the subscribed subject is received based on a data distribution service(608).

Description

Network control method based on data distribution service {METHOD FOR MANAGING NETWORK BASED ON DATA DISTRIBUTION SERVICE}

The present invention relates to a network control method based on a data distribution service, and more particularly, instead of request-response based on the Simple Network Management Protocol (SNMP), the intention to subscribe to the network management data is subscribed to the subject. By publishing the network management data generated for each subject, the present invention relates to a network control method based on a data distribution service, in which a network control system and a network node can exchange network management data in real time.

Operation, Administration, and Maintenance (OAM) devices detect network failures and measure network performance. To this end, the OAM device includes devices for monitoring network operation required for network failure detection and network performance measurement.

A typical OAM device is implemented only at the physical layer such as synchronous digital hierarchy (SDH) in the Internet including switches and routers. Therefore, the central control system can manage and control the state of the physical layer of the devices on the network by using the OAM device implemented in the physical layer between network nodes. On the other hand, it is difficult to measure Quality of Service (QoS) factors at the Ethernet layer, that is, at the Ethernet level. For example, management at the Ethernet layer includes frame delay, frame delay variation and frame loss.

Ethernet is a trend that extends from enterprise-wide local area networks (LANs) to carrier networks. For example, carrier networks include carrier Ethernet. As such, since the network from the corporate campus to the carrier's network is built on an Ethernet basis, end-to-end management and monitoring at the Ethernet layer is required.

Recently, standardization is underway to introduce OAM devices in the Ethernet layer such as connectivity verification, fault detection, performance monitoring and warning display. Ethernet OAM devices enable network operators to measure QoS factors such as frame delay, frame delay variation and frame loss. Ethernet OAM devices use these measurements to identify problems before they spread to the network, so that network users are not affected by network faults.

1 is a block diagram of a public network and a premises network to which a conventional SNMP-based network control system is applied.

As shown in FIG. 1, a conventional SNMP-based network management system (NMS) 110 may include a manager 111, an SNMP 112, a UDP 113, an IP 114, and an Ethernet 115. And SDH 116. The router 120 includes an agent 121, an SNMP 122, a UDP 123, an IP 124, an Ethernet 125, and an SDH 126. There is a public network between the network control system 110 and the router 120. In addition, the router 120 is connected to the server 131 and the terminal 132 through a switch 130 connected to the premises network.

The router 120 in the network stores information collected through the OAM function in the form of a management information base (MIB). The network control system 110 that performs network management includes an SNMP agent 121 and a network control system 110 embedded in each network device (eg, the router 120) based on the Simple Network Management Protocol (SNMP). Network management information is obtained through communication between the managers 111 of FIG. Simple Network Management Protocol (SNMP) is an application layer standard protocol established on TCP / IP for the purpose of managing and monitoring network devices.

In the physical layer of the SDH 116, the OAM function is set by the standardization mechanism. Therefore, the remote network control system 110 may facilitate information management of the physical layer with respect to the router 120 having the physical layer of the SDH 126. However, network devices installed in customer premises networks often do not include the SDH physical layer. There is a problem that it is not easy for the remote network control system 110 to manage a network device that does not include this SDH physical layer. In addition, the OAM function for managing the Ethernet layer is often not implemented in a network device. As such, when the OAM function is not implemented, there is a problem that the network control system 110 does not easily manage the network device at the Ethernet level.

The SNMP agent 121 is installed in the managed network device, that is, the router 120. The SNMP agent 121 performs a function of collecting and storing network management information related to management and monitoring of the router 120 according to a preset standard. The SNMP manager 111 collects information related to network management and monitoring (for example, configuration information, performance information, and failure information) from the SNMP agent 121 of the router 120 to manage the entire network.

The conventional SNMP-based network control system 110 is a client-server method. The network control system 110 uses a client-centric scheme in which the service provider (server) transmits the requested information to the service requester (client) when the service requester (client) requests it. For example, the client may be a manager 111, and the system including the manager 111 is called the network control system 110. The server may be an agent 121 and operates on network devices that are to be managed and collects necessary network management information and transmits the collected network management information to the manager 111 of the network control system 110.

The SNMP manager 111 needs to receive a network management information collected or stored by the SNMP agent 121 and reduce a time for processing a network failure through the network management information. That is, it is desirable to keep the time at the time of transmission and processing of network management information to a minimum.

However, the conventional SNMP-based network control system 110 has a problem that it takes a long time to get the network management information when collecting the management information using the polling technique of SNMP. In other words, the time required for transmitting network management information between the network control system 110 and the network nodes (for example, the router 120 and the switch 130, etc.) to be managed will be described. Based on SNMP, data transmission / reception takes a lot of time.

That is, the network control system 110 that remotely manages the overall management of the nodes and links on the network should quickly identify problems and take appropriate measures so that the effects of network problems and defects do not reach network users. However, the conventional network control system 110 performs overall management of nodes and links on the network based on SNMP. In this case, since the SNMP method operates on a client-server basis for requesting network management information and waiting for a response from an agent in a network node to be managed, it is not suitable for immediate transmission and reception of information.

In addition, the conventional SNMP-based network control system 110 does not collect or use network management information based on the Ethernet OAM function, there is a problem that it is not easy to manage other network devices in the Ethernet-based network.

Therefore, the prior art as described above has a problem in that the transmission / reception time of network management information is delayed due to the use of SNMP based request and response methods, and it is difficult to manage network devices based on Ethernet. It is a subject of the present invention.

Therefore, the present invention subscribes to the intention to receive the network management data by subject and publishes the network management data generated by each subject instead of the request-response method based on the Simple Network Management Protocol (SNMP). It is an object of the present invention to provide a network control method based on a data distribution service that allows a network control system and a network node to exchange network management data in real time when the corresponding condition is satisfied.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The present invention, in order to solve the above problems, instead of request-response based on the Simple Network Management Protocol (SNMP), subscribe to the intention to receive the network management data by the subject (subject) and the network management data generated by each subject By publishing, the network control system and the network node can send and receive network management data in real time if the corresponding condition is satisfied.

More specifically, the method of the present invention provides a data distribution service based network control method, comprising: a subject setting step of setting a network management theme for network management data occurring on a network; A topic joining step of subscribing to at least one topic among the set topics; And a data posting step of posting network management data corresponding to the subscribed topic in real time for each of the set topics.

The method may further include a data receiving step of receiving network management data corresponding to the subscribed subject on the basis of a data distribution service.

The present invention as described above, instead of request-response method based on Simple Network Management Protocol (SNMP), subscribes to the intention to receive network management data by topic and publishes network management data generated by each topic. In this case, when the corresponding condition is satisfied, the network control system and the network node can exchange network management data in real time.

The present invention can quickly identify and respond to information on problems / defects of nodes and links on a network so that the effects thereof do not reach network users, and also manage networks in Ethernet-based public networks and customers' internal network environments. There is an effect that can be controlled in real time through the rapid delivery of network management information for.

The present invention, in terms of the time required to transfer management data between the network control system and the network nodes to be managed, by posting and receiving data when the data is generated, compared to the SNMP method based on the conventional request and response method, The delay time for reception is reduced.

In addition, the present invention uses the management information collected based on the Ethernet OAM function, there is an effect that it is easy to manage all the network nodes embedded with the Ethernet MAC layer in the Ethernet-based network.

Furthermore, the present invention has an effect that it is easy to implement a network control system having a standby role to solve a single point of failure in the centralized network management structure of the conventional centralized network management structure. have.

In addition, the present invention can receive data through the subscription to the network management information, there is an effect that the network control system can be implemented by distributing the functions for each subject.

The above objects, features, and advantages will be more clearly understood from the following detailed description with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may have the technical idea of the present invention. It will be easy to implement. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is to manage the network in real time using a data distribution service (DDS) through data-centric publishing and subscription in a distributed environment, instead of the conventional client-server method. Here, data distribution service (DDS) is beginning to be applied to systems requiring real-time communication, such as the financial and defense sectors.

According to the Carrier Ethernet technical standard, Ethernet-based networks are not limited to local area networks (LANs) but are spreading to public networks. Recently, standardization has been made to introduce OAM functions in the Ethernet layer such as connectivity verification, fault detection, performance monitoring, and warning display. Therefore, it is assumed that the present invention is applied to an Ethernet-based network as an example, and it is assumed that each node in the network implements an Ethernet OAM function.

The present invention relates to a real-time monitoring device through the rapid transfer of information for the management of the network in Ethernet-based public and premises network environment. To this end, the present invention uses a data distribution service (DDS), which is network middleware, instead of a conventional SNMP-based network control system.

2 is a diagram illustrating an embodiment of an Ethernet-based network environment to which the present invention is applied.

As shown in FIG. 2, it is assumed that the present invention is applied to an Ethernet-based public network and an internal network environment as an example.

It is assumed that the customer's premises network 220 is composed of an Ethernet-based LAN, and the public network 210 of the carrier is composed of a carrier Ethernet-based provider network. In addition, the nodes and the network control apparatus in the network to be managed make a network by using a virtual LAN (VLAN) for network control, and recognizes that they are connected on one LAN.

3 is a diagram illustrating an embodiment of a protocol stack for data distribution service based network control according to the present invention.

As shown in FIG. 3, the network control apparatus 310 and the network node 1 320 communicate with each other via the carrier Ethernet-based public network 301, and the network node 1 320 and the network node 2 330. Is communicated through the premises network 302. Network node 2 330 is connected to server 341 and terminal 342. The network control apparatus 310 includes a network control application unit 311, a DDS layer 312, a UDP layer 313, an Ethernet layer 314, and a PHY layer 315. In addition, network node 1 320 and network node 2 330 are node management applications 321 and 331, DDS layers 322 and 332, UDP layers 323 and 333, and Ethernet layers 324 and 334, respectively. And PHY layers 325 and 335.

Looking at the protocol stack of the network control device 310 and the network nodes 1 and 2 (320, 330) for network control using a data distribution service as follows.

Unlike the conventional network control device and network node, the network control device 310 and the network nodes 1 and 2 (320, 330) according to the present invention are the upper layer of the Ethernet MAC layer (314, 324, 334), without the IP layer UDP Have layers 313, 323, and 333. That is, the data of the UDP layers 313, 323, and 333 are directly loaded on the Ethernet MAC frame and transmitted. In general, the IP layer is a network layer, which supports the routing of packets on a network. Since the network control apparatus 310 and the network nodes 320 and 330 according to the present invention are connected to the virtual LAN, no IP layer is required. Network control device 310 and network nodes 1 and 2 (320, 330) identify multiple publishers and subscribers using port numbers of UDP layer 313, 323, 333, including multiple publishers and subscribers. .

4 is a diagram illustrating an embodiment of a network control device and a network node based on a data distribution service according to the present invention.

As shown in FIG. 4, the network control system includes a network control device 410 and a network node 420. The network control device 410 and the network node 420 are connected through a network 401.

The network control device 410 includes a network control control unit 411, a data distribution service middleware 412, a delivery network matching unit 413, a delivery network OAM unit 414, and a network management information storage unit 415. Here, the network control controller 411 includes a status receiver 4111, an event receiver 4112, and a command transmitter / receiver 4113.

The network control device 410 manages network nodes 420 in the network. To this end, the network control device 410 may store and use necessary related data, and performs a function of controlling and monitoring the network nodes 420 in the network.

The network node 420 includes a node manager 421, a data distribution service middleware 422, a delivery network matching unit 423, a delivery network OAM unit 424, and a node management information storage unit 425. Here, the node manager 421 includes a status transmitter 4211, an event transmitter 4212, and a command transmitter / receiver 4213.

The network control device 410 and the network node 420 will be described in detail as follows.

The network control controller 411 receives or transmits the network node 420, which is a management target, node state information, event information, and a control command.

The data distribution service middleware 412 distributes the data transmitted from the network control controller 411 on the basis of publish and subscribe.

The delivery network matching unit 413 communicates with the network nodes 420 that are remote management targets through messages received from the data distribution service middleware 412.

The transport network OAM unit 414 manages the physical layer and the Ethernet MAC layer.

The network management information storage unit 415 stores network management information collected from the network nodes 420.

Looking at the network control controller 411 in detail, the state receiving unit 4111 of the network control control unit 411 has a communication function with the data distribution service middleware 412 and receives state information for each data type for management.

The event receiver 4112 has a communication function with the data distribution service middleware 412 and receives event information according to data characteristics for management.

The command transmitter / receiver 4113 has a communication function with the data distribution service middleware 412 and processes a control command according to data characteristics for management.

On the other hand, the node manager 421 manages the communication function with the data distribution service middleware 422.

The data distribution service middleware 422 provides an event-based data distribution service.

The delivery network matching unit 423 transmits a message transmitted / received through the data distribution service middleware 422 through a lower Ethernet-based transport network.

The transport network OAM unit 424 performs OAM functions of the physical layer and the Ethernet MAC layer.

The node management information storage unit 425 stores information collected from the node manager 421 and the delivery network OAM unit 424.

Referring to the node manager 421 in detail, the state transmitter 4211 of the node manager 421 has a communication function with the data distribution service middleware 422 and transmits state information for each data characteristic for management.

The event transmitter 4212 has a communication function with the data distribution service middleware 422 and transmits event information according to data characteristics for management.

The command transmitting / receiving unit 4213 has a communication function with the data distribution service middleware 422 and processes a control command for each type of data for management.

5 is a diagram illustrating an embodiment of a network control method based on a data distribution service according to the present invention.

The network control device 510 connects the network nodes 520, 530, and 540 which are management targets to a management virtual network.

Network control device 510 and network nodes 1, 2,... , n (520, 530, 540) sets (defines) a network management topic. Looking at the topic posting and subscription, the network control device 510 and the managed network nodes 1, 2,... , n (520, 530, 540), to manage the network, first to set the data to be sent and received for each topic (501). Subject data is set (defined) in a structure. For example, a fault event may include various types such as an alarm indication signal (AIS) and a remote defect indicator (RDI). Network control device 510 and network nodes 1, 2,... , n (520, 530, 540) publish the management subject data. To do this, the fault data is set (defined) as a structure.

In addition, the network control device 510 and network nodes 1, 2,... Next, a process of exchanging a message for network management between n (520, 530, 540) will be described. On a particular subject, multiple network nodes (eg, network nodes 1, 2,..., N (520, 530, 540)) may all publish data. Thus, network nodes 1, 2,... , n (520, 530, 540) need to distinguish which network node has posted data. To this end, an identification key included in the data of the structure is used to distinguish the publisher of the data.

For network management, the network control device 510 to publish related data or network nodes 1, 2,... , n (520, 530, 540) publishes data. This can be done by revealing the intention to publish the data.

Network control device 510 and network nodes 1, 2,... If there is network management data to be received by the n (520, 530, 540), the network controller 510 and the network nodes 1, 2,... , n (520, 530, 540) should subscribe to the topic. Network control device 510 or managed network nodes 1, 2,... , n (520, 530, 540) subscribes to management data corresponding to a condition desired by the user. After such posting and subscription is made, the network control device 510 and the managed network nodes 1, 2,... , 520, 530, and 540 may transmit / receive network management data or network management information.

When the network management data is published, the network control apparatus 510 or network nodes 1, 2,... Subscribed to this network management data. , n (520, 530, 540) receives the subscribed data. In the process of delivering network management data, the UDP port number identifies the sender / receiver of the network management data. The network controller 510 transmits the UDP packet by including the UDP packet in the Ethernet MAC.

Network nodes 1, 2,... If one of the n (520, 530, 540) network node (for example, network node 1 (520)) generated the subject data on the network management needs to be transmitted to the network control device 510, Network node 1 520 only needs to publish this subject data. The network control device 510 subscribed to for receiving the subject data immediately receives the posted data through the data distribution service (DDS).

As described above, the present invention relates to a network control method having an Ethernet OAM function in each network node in an Ethernet-based network, and quickly transmitting management information collected through the event-based data distribution service. . Network control device 510 and network nodes 1, 2,... , n (520, 530, 540) publishes the network management data and subscribes to the subject 501 for the network management data in a desired condition, thereby immediately sending the network management data included in the subscribed subject. Or receive it.

6 is a flowchart illustrating an embodiment of a network control method based on a data distribution service according to the present invention.

Network control device 510 and network nodes 1, 2,... n (520, 530, 540) sets (define) a network management topic for network management data occurring on the network (602). Here, subject data is set (defined) in a structure.

Network control device 510 or managed network nodes 1, 2,... , n (520, 530, 540) subscribes to at least one of the set topics (604). That is, the network control device 510 or network nodes 1, 2,... , n (520, 530, 540) subscribes to network management data corresponding to a condition desired by the user.

For network management, the network control device 510 to publish related data or network nodes 1, 2,... , n 520, 530, 540 publish 606 data. When data to be posted on a particular subject occurs at a network node, there may be situations where multiple nodes may simultaneously initiate data on the same subject. Thus, network nodes 1, 2,... , n (520, 530, 540) need to distinguish which network node has posted data. To this end, an identification key included in the data of the structure is used to distinguish the publisher of the data. At this time, the network control device 510 or network nodes 1, 2,... , n (520, 530, 540) distinguishes the sender / receiver of network management data through the UDP port number, and transmits the UDP packet by including the UDP packet in the Ethernet MAC.

Network control device 510 or managed network nodes 1, 2,... , n (520, 530, 540) receives the published network management data based on the data distribution service (608).

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is a configuration diagram of a public network and a premises network to which a conventional SNMP-based network control system is applied;

2 is a diagram illustrating an embodiment of an Ethernet-based network environment to which the present invention is applied;

3 is a diagram illustrating an embodiment of a protocol stack for data distribution service-based network control according to the present invention;

4 is a configuration diagram of an embodiment of a network control device and a network node based on a data distribution service according to the present invention;

5 is a diagram illustrating an embodiment of a network control method based on a data distribution service according to the present invention;

6 is a flowchart illustrating an embodiment of a network control method based on a data distribution service according to the present invention.

* Explanation of symbols for the main parts of the drawings

410: network control unit 411: network control unit

412 data distribution service middleware 413 delivery network matching unit

414: transport network OAM unit 415: network management information storage unit

420: network node 421: node management unit

422 data distribution service middleware 423 delivery network matching unit

424: transport network OAM unit 425: node management information storage unit

Claims (8)

In the network control method based on the data distribution service, A topic setting step of setting a network management topic for network management data occurring on the network; A topic joining step of subscribing to at least one topic among the set topics; And A data posting step of posting network management data corresponding to the subscribed topic in real time for each of the set topics; Data distribution service-based network control method comprising a. The method of claim 1, Data receiving step of receiving the network management data corresponding to the subscribed topic based on the data distribution service Data distribution service-based network control method further comprising. The method of claim 1, The subject setting step, The network control method based on the data distribution service for setting the network management subject to at least one of the status data, event data and command information. The method according to claim 1 or 2, The data posting step, A network control method based on a data distribution service for posting the network management data through a virtual LAN in a multicast manner. The method according to claim 1 or 2, The data posting step, And a UDP packet for the network management data is transmitted through a UDP port in order to distinguish a sender / receiver of network management data corresponding to the subscribed subject. The method of claim 5, The data posting step, A network control method based on a data distribution service for transmitting a UDP packet for the network management data in an Ethernet MAC. The method according to claim 1 or 2, The subject setting step, A network control method based on a data distribution service that sets the subject as a structure. The method of claim 7, wherein The data posting step, And a data distribution service-based network control method including the identification key for identifying the network node in the subject data set as the structure.

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