JP2007325155A - Network management apparatus and network management system - Google Patents

Network management apparatus and network management system Download PDF

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JP2007325155A
JP2007325155A JP2006155727A JP2006155727A JP2007325155A JP 2007325155 A JP2007325155 A JP 2007325155A JP 2006155727 A JP2006155727 A JP 2006155727A JP 2006155727 A JP2006155727 A JP 2006155727A JP 2007325155 A JP2007325155 A JP 2007325155A
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polling
device
request message
unit
management target
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Takahiro Tsujimoto
隆宏 辻本
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Abstract

Even if the number of devices to be managed increases, concentration of processing load due to polling processing on the devices to be managed is avoided.
A device information storage unit 123, a connection management unit 122, a polling unit 124, and a polling counting unit 125 are provided. The polling unit 124 is a polling counting unit 125 of a managed device 13 to be polled. The count value is monitored, a polling request message is transmitted to the managed device 13 when the count value is less than the predetermined reference transmission count, and the polling process is terminated when the count value reaches the reference transmission count, and other processing is performed. Execute. As a result, it is possible to obtain time and physical resources for executing other processes without concentrating the processing load on the polling process, and it is possible to avoid a delay in the process as a whole. .
[Selection] Figure 2

Description

  The present invention relates to a network management apparatus and a network management system that manage connection states of a plurality of devices connected on an IP network.

  Conventionally, a network management system in which the line connection device aggregates the operation status and failure status of the data transmission device, and the network monitoring device polls the line connection device to acquire the operation status and failure status of the data transmission device is known. (For example, refer to Patent Document 1). FIG. 12 is a configuration diagram of a conventional network management system described in Patent Document 1. In FIG. The network management system includes a line connection device 100, a network monitoring device 200, and data transmission devices 300a to 300g such as modems. The network monitoring device 200 is connected to the line connection device 100 via the transmission line 500. The data transmission devices 300a, 300c, and 300e are connected to the line connection device 100 via the transmission line 400. The data transmission device 300b is connected to the data transmission device 300a via the transmission line 400, the data transmission device 300d is connected to the data transmission device 300c via the transmission line 400, and the data transmission devices 300f and 300g are connected via the transmission line 400. Connected to the data transmission device 300e. That is, the conventional network management system has a configuration in which the line connection device 100 is provided between the data transmission devices 300 a to 300 g and the network monitoring device 200.

  In the network management system shown in FIG. 12, the line connection device 100 polls the data transmission devices 300a to 300g, and collects and holds the operation status and failure status of each of the data transmission devices 300a to 300g. The network monitoring device 200 constantly polls the line connection device 100 and collects the operation status and failure status of each of the data transmission devices 300a to 300g held in the line connection device 100. Then, the network monitoring device 200 displays the collected operation status and failure status of each of the data transmission devices 300a to 300g on the screen display mechanism.

  According to the network management system shown in FIG. 12, the network monitoring device 200 can acquire the operation status and failure status of the data transmission devices 300a to 300g by polling only the line connection device 100. Therefore, compared to a method in which the network monitoring apparatus 200 polls each of the data transmission apparatuses 300a to 300g, the load on the network monitoring apparatus 200 is reduced, and the function of the network monitoring apparatus 200 can be improved.

In recent years, in home networks that connect household electrical devices to each other, multipurpose terminals such as personal computers use the universal plug and play function to discover and manage devices that have a universal plug and play function on the home network. The intention to do is getting stronger.
JP-A-7-23054 (5th page, FIG. 1)

  However, in the network management system disclosed in Patent Document 1, when the number of data transmission devices 300a to 300g increases with an increase in the number of devices to be managed, the processing load of polling processing in the line connection device 100 is increased. There has been a problem that a delay occurs in the original functions of the line connection device 100 such as IP packet routing.

  In addition, when a device having a universal plug and play function discovered by a multipurpose terminal is displayed on a home network, the network configuration displayed on the screen is different from the actual network configuration due to the time lag between the polling time and the current time. There is a risk of differences. In order to prevent this, it is necessary to increase the number of polls and reduce the time lag between the polling time and the current time. However, as the number of polling targets increases, the polling process occupies most of the entire process. Therefore, there is a problem that a delay occurs in device discovery.

  The present invention solves these conventional problems, and even if the number of managed devices to be managed increases, a network management device capable of avoiding concentration of processing load due to polling processing to the managed devices, and An object is to provide a network management system.

  A network management apparatus according to the present invention is a network management apparatus that manages a plurality of management target devices connected via a network, and includes a device information storage unit that stores device information of the management target device, and the management target device A detection request message for detecting entry into the network is transmitted to the managed device, a detection response message transmitted from the managed device that received the detection request message is received, and the device information storage means stores the device Among the management target devices in which information is stored, the management target device that has not transmitted the detection response message is identified as a polling management target device that transmits a polling request message, and the polling management target device, Porin for detecting whether or not the connection to the network is continued A polling unit that transmits a request message and receives a polling response message transmitted from a polling management target device that has received the polling request message, and a polling counting unit that counts the number of times the polling request message is transmitted for each polling management target device The polling means transmits the polling request message to a polling management target device whose count value by the polling counting means is less than a predetermined reference transmission count.

  A network management system according to the present invention is a network management system including a network management device that manages a device to be managed, and a plurality of devices to be managed that are connected to the network management device via a network. Transmits device information storage means for storing device information of the managed device and a detection request message for detecting entry of the managed device into the network to the managed device, and transmits the detection request message. The management device that has received the detection response message transmitted from the managed device and has stored the device information in the device information storage means sends a polling request message to the management device that has not transmitted the detection response message. Connection management specified as a polling management target device to be sent And a polling request message for detecting whether or not the connection to the network is continued to the polling management target device, and polling transmitted from the polling management target device that has received the polling request message. A polling unit that receives a response message; and a polling counter that counts the number of times a polling request message is transmitted for each of the polling management target devices. The management target device receives the detection request message and the detection response. A detection message transmission / reception unit for transmitting a message; and a polling message transmission / reception unit for receiving the polling request message and transmitting the polling response message. The polling unit of the network management device includes the polling count Count value by stages to the polling management subject device less than a predetermined reference number of times of transmission, and transmits a polling request message.

  According to these configurations, the device information storage unit stores information on managed devices connected to the network. The connection management unit transmits a detection request message for detecting entry of the detection target device into the network, and receives a detection response message transmitted from the management target device that has received the detection request message. Then, the connection management unit identifies the management target device that has not transmitted the detection response message among the management target devices whose device information is stored in the device information storage unit, as the polling management target device that transmits the polling request message. .

  Then, the polling means transmits a polling request message to the management target device specified as the polling management target device. The polling counting means counts the number of transmissions of the polling request message for each polling management target device. The polling unit transmits a polling request message to a polling management target device whose count value by the polling counting unit is less than a predetermined reference transmission number. The polling process is aborted without sending the polling request message.

  Here, when the number of managed devices increases, the network management device repeatedly transmits a polling request message to each polling managed device and receives a polling response message from each polling managed device. The processing load must be concentrated on the polling process. Therefore, it becomes difficult to concentrate the processing load on other processes such as a process for discovering a management target apparatus and a process for acquiring and storing apparatus information.

  However, in this network management device and this network management system, when the count value by the polling counting means exceeds a predetermined reference transmission count, the polling process is terminated, so that the processing load is concentrated only on the polling process. It can be avoided. As a result, the processing efficiency of the entire network management system including the network management device and the management target device can be improved.

  Further, in the above configuration, in order to transmit the polling request message at a constant period, the polling request message is further provided with a clocking unit that clocks the fixed period, and the polling unit is configured to transmit the polling request message based on a timing result by the clocking unit Is preferably transmitted at a constant cycle.

  According to this configuration, when the polling request message is transmitted at a constant period, the constant period is timed by the time measuring means, so that the polling request message can be transmitted accurately at a constant period.

  In the upper device configuration, it is preferable that the connection management unit transmits the detection request message in accordance with a predetermined first protocol and acquires the device information by the first protocol.

  According to this configuration, since the connection management unit acquires device information using the same protocol as the protocol for transmitting the detection request message, the process can be simplified.

  In the above configuration, the detection response message includes location information indicating a storage position of a management target device that transmits the detection response message, and the connection management unit acquires the device information from the storage position indicated by the location information. It is preferable to do.

  According to this configuration, the detection response message includes location information indicating the storage position of the device information, and the connection management unit acquires the device information from the storage position indicated by the location information. It can be acquired with certainty.

  In the above configuration, the location information is preferably a URI in the HTTP protocol.

  According to this configuration, since the location information is a URI of the HTTP protocol, the device information can be accurately acquired.

  In the above configuration, it is preferable that the first protocol is a universal plug and play (UPnP) SSDP protocol, and the detection request message includes an M-SEARCH method.

  According to this configuration, the detection response message is acquired by the M-SEARCH method of the SSDP protocol.

  In the above configuration, it is preferable that the polling unit transmits the polling request message using a second protocol different from the first protocol, and the second protocol is a UDP protocol.

  According to this configuration, since the polling request message is transmitted by the UDP protocol, the polling request message can be transmitted at high speed.

  In the above configuration, it is preferable that the polling unit transmits the polling request message using a second protocol different from the first protocol, and the second protocol is an ICMP protocol.

  According to this configuration, since the polling request message is transmitted by the ICMP protocol, the polling response message can be acquired from a management target device that does not support SNMP (Simple Network Management Protocol).

  In the above configuration, the device information includes information indicating a device type for each managed device, and further includes a reference transmission number storage unit that stores in advance a reference transmission number for each type of the managed device. The polling means identifies the type of device for each polling management target device from the device information, uses the specified type of device, refers to the reference transmission number storage means, and determines the reference transmission number for each polling management target device. Preferably, the representative value of the specified reference transmission count is further specified, and the polling request message is transmitted to a polling management target device whose count value by the polling counting means is less than the representative value.

  According to this configuration, the number of transmissions of the polling request message can be set flexibly according to the type of managed device.

  According to the present invention, the polling request message is transmitted when the number of times the polling request message is transmitted to each managed device is less than the predetermined reference number of times. Since the process is terminated, it is possible to avoid the processing load from being concentrated only on the polling process and to improve the efficiency of the process.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a network configuration diagram of a network management system according to an embodiment of the present invention. The network work management system shown in FIG. 1 includes a network management device 12 and a management target device 13 connected to the network management device 12 via the network 11. In FIG. 1, the number of management target devices 13 is three, but the number of management target devices 13 is not limited to this, and it is sufficient that at least one management target device 13 is connected to the network 11. . As the network management device 12, a home server or a home gateway, or a personal computer having a function such as a home server or a home gateway can be employed. As the management target device 13, an electrical device such as a personal computer, a wireless LAN terminal, a gateway, a switching hub, a television, a DVD recorder, or the like can be employed.

  FIG. 2 is a functional block diagram of the network management apparatus 12 shown in FIG. The network management device 12 includes a communication unit 121, a connection management unit 122, a device information storage unit 123, a polling unit 124, a polling counting unit 125, a timer 126, and a reference transmission number storage unit 127.

  The communication unit 121 includes a communication circuit and the like, and transmits various data to the network 11 and receives various data from the network 11 according to the TCP / IP protocol stack. The connection management unit 122 includes a CPU or a dedicated hardware circuit, and communicates an M-SEARCH request message (detection request message) for detecting whether the management target device 13 is connected to the network 11. Multicast to the managed device 13 via the unit 121. Here, the M-SEARCH request message is a message conforming to the SSDP (Simple Service Discovery Protocol) protocol in Universal Plug and Play (UPnP) and includes an M-SEARCH method.

  Furthermore, the connection management unit 122 receives an M-SEARCH response message (detection response message) transmitted from the management target device 13 that has received the M-SEARCH request message via the communication unit 121. Here, the M-SEARCH response message is a response message to the M-SEARCH request message. The M-SEARCH response message conforms to the SSDP protocol, and the UUID uniquely given to the management target device 13 that transmits the M-SEARCH response message and the management target device 13 that transmits the M-SEARCH response message. And a description URL indicating the storage location of the description in which the device information is described.

  Furthermore, the connection management unit 122 determines whether the device information of the management target device 13 that has transmitted the M-SEARCH response message is stored in the device information storage unit 123 based on the UUID included in the received M-SEARCH response message. Determine whether.

  Further, when the connection management unit 122 determines that the device information of the management target device 13 that has transmitted the M-SEARCH response message is stored in the device information storage unit 123, the connection management unit 122 executes device information update processing, and M-SEARCH The device information of the managed device 13 is acquired from the managed device 13 that has transmitted the response message, and the content of the device information database stored in the device information storage unit 123 is updated with the acquired device information.

  Furthermore, when the connection management unit 122 determines that the device information of the management target device 13 that has transmitted the M-SEARCH response message is not stored in the device information storage unit 123, the connection management unit 122 acquires the device information from the management target device 13. Then, a new device information record is generated and added to the device information database stored in the device information storage unit 123.

  Further, the connection management unit 122 transmits a polling request message to be described later to the managed device 13 that has not transmitted the M-SEARCH response message among the managed devices 13 whose device information is stored in the device information storage unit 123. It is specified as the management target device 13 that needs to be performed.

  The polling unit 124 is composed of a CPU or a dedicated hardware circuit, and is connected to the management target device 13 (polling management target device) identified by the connection management unit 122 as having to transmit a polling request message. A polling request message for confirming whether or not the connection to is continued is transmitted via the communication unit 121. Here, the polling request message is transmitted by unicast according to the UDP (User Datagram Protocol) protocol. The polling unit 124 may transmit a polling request message in accordance with an ICMP (Internet Control Message Protocol) protocol different from the UDP protocol. Further, when the polling unit 124 receives the trigger signal output from the timer 126, the polling unit 124 transmits a polling request message. Thereby, the polling request message is transmitted at a constant cycle.

  Furthermore, the polling unit 124 receives the polling response message transmitted from the management target device 13 that has received the polling request message via the communication unit 121. The polling response message includes the UUID of the management target device 13 that transmits the polling response message, and is transmitted by unicast according to the UDP protocol.

  Further, the polling unit 124 causes the polling counting unit 125 to count the number of transmissions of the polling request message for each managed device 13.

  Further, the polling unit 124 transmits a polling request message to the management target device 13 whose count value by the polling counter unit 125 is less than a predetermined reference transmission count, and the count value by the polling counter unit 125 is a predetermined reference value. The polling request message is not transmitted to the management target device 13 that is equal to or greater than the number of transmissions. The timer 126 counts the fixed period in order to transmit the polling request message at a fixed period, and outputs a trigger signal for determining the transmission timing of the polling request message to the polling unit 124 every time the fixed period is measured.

  The device information storage unit 123 includes a rewritable nonvolatile storage device such as an EEPROM (Electronically Erasable and Programmable Read Only Memory) or an external storage device such as a hard disk, and stores device information of the device to be managed 13. Remember the database. FIG. 3 is a diagram illustrating a data structure of the device information database. The device information database is an ordered set of records generated for each device information. The records constituting the device information database have a uniquely assigned record number. In this embodiment, the record number is an integer whose value increases by 1 in the order in which the records are generated. Each record indicates a field for storing the UUID of the management target device 13, a field for storing an IP (Internet Protocol Address) address of the management target device 13, and a storage location of the description in which the device information of the management target device 13 is described. It includes a field for storing a description URL (Uniform Resource Locator), a field for storing a polling request flag, a field for storing the type of device, and a field for storing a survival confirmation time.

  The UUID (Universally Unique Identifier) is a 128-bit universal unique identifier, and is uniquely assigned to each managed device 13. The polling request flag is data indicating that the managed device 13 is identified when the connection management unit 122 transmits a polling request message. The device type is data indicating the type of the management target device 13. The survival confirmation time indicates the update time of the record and the latest transmission time of the polling request message to the management target device 13.

  In FIG. 3, the records are arranged sequentially in the order of record numbers. However, the present invention is not limited to this, and the records are continuously arranged as long as the records are uniquely determined by the record numbers. Need not be arranged. Further, although an integer is adopted as the record number, the present invention is not limited to this, and an address for storing the record may be adopted.

  2 includes a nonvolatile rewritable storage device such as an EEPROM (Electronically Erasable and Programmable Read Only Memory) or an external storage device such as a hard disk, and polls the management target device 13. Stores a predetermined reference transmission number of request messages. In this embodiment, 5 times is adopted as the reference transmission frequency.

  FIG. 4 is a functional block diagram of the management target device 13 shown in FIG. The managed device 13 includes a communication unit 131, an M-SEARCH transmission / reception unit 132, a description distribution unit 133, and an ssdp: alive transmission unit 134.

  The communication unit 131 includes a communication circuit and the like, and transmits various data to the network 11 and receives various data from the network 11 according to the TCP / IP protocol stack. The M-SEARCH transmission / reception unit 132 receives the M-SEARCH request message transmitted from the network management device 12 via the communication unit 131. Further, the M-SEARCH transmission / reception unit 132 transmits an M-SEARCH response message of the received M-SEARCH request message to the network management apparatus 12 via the communication unit 131.

  The description distribution unit 133 includes a CPU or a dedicated hardware circuit, and receives a device information request message transmitted from the network management device 12 to acquire device information via the communication unit 131. Here, the device information request message includes a GET method of HTTP (Hyper Text Transfer Protocol) protocol. Further, when receiving the device information request message, the description distribution unit 133 generates a device information response message including a description in which device information is described in XML (Extensible Markup Language), and transmits the device information response message to the network management device 12. The device information includes a UUID of the management target device 13, an IP address of the management target device 13, a type of device, and a description URL indicating a storage location of the description in which the device information is described.

  The ssdp: alive transmission unit 134 transmits a Notify (alive) message that causes the network management apparatus 12 to detect that the managed device 13 has entered the network 11 according to the universal plug and play SSDP protocol. Note that since HTTP and XML are publicly known contents, description of these details will be omitted.

  Next, the operation of the network management device 12 will be described. The network management device 12 alternately repeats the connection management process by the connection management unit 122 and the polling process by the polling unit 124.

  FIG. 5 is a sequence diagram showing processing of the connection management unit 122 and the polling unit 124 shown in FIG. First, the connection management unit 122 executes connection management processing. When the connection management process ends, the polling unit 124 executes the polling process. When the polling process ends, the connection management unit 122 executes the connection management process again. As described above, the network management device 12 alternately repeats the connection management process by the connection management unit 122 and the polling process by the polling unit 124.

  FIG. 6 shows a flowchart of the connection management process shown in FIG. First, the connection management unit 122 multicasts an M-SEARCH request message to the network 11 (step S101). Next, the connection management unit 122 determines whether or not a predetermined timeout period has elapsed since the transmission of the M-SEARCH request message (step S102). If the timeout period has elapsed (YES in step S102), The polling request flag setting process is executed (step S104), the connection management process is terminated, and the process is shifted to the polling process by the polling unit 124.

  On the other hand, if the timeout time has not elapsed (NO in step S102), the process proceeds to step S103. The details of the polling request flag setting process will be described later.

  Next, the connection management unit 122 determines whether or not the M-SEARCH response message transmitted from the management target device 13 has been received (step S103), and when the M-SEARCH response message is received (in step S103). YES), the process proceeds to step S105. On the other hand, when the connection management unit 122 has not received the M-SEARCH response message transmitted from the management target device 13 (NO in step S103), the process returns to step S102.

  That is, the connection management unit 122 receives the M-SEARCH response message until the timeout time elapses after transmitting the M-SEARCH request message.

  In step S105, the connection management unit 122 extracts the UUID of the management target device 13 that has transmitted the M-SEARCH response message from the received M-SEARCH response message, and records a record including the extracted UUID from the device information database. Extract (step S106).

  Next, the connection management unit 122 determines whether or not there is a record including the UUID extracted in step S105 in the device information database (step S107), and there is no record including the UUID extracted in step S105. (NO in step S107), device information addition processing is performed (step S108). Details of the device information addition process will be described later.

  On the other hand, when there is a record including the UUID read in step S105 in the device information database (YES in step S107), the connection management unit 122 performs device information update processing. Details of the device information update process will be described later.

  Next, after the device information addition process in step S108 or the device information update process in step S109 is completed, the connection management unit 122 reads the survival confirmation time of each record in the device information database, and calculates the time from the survival confirmation time to the current time. Records that are longer than the predetermined time, that is, records that have not been updated for longer than the predetermined time are deleted from the device information storage unit 123 (step S110), and the process returns to step S102 to receive the next M-SEARCH response message.

  FIG. 7 is a sequence diagram showing the procedure of the device information addition process shown in step S108 of FIG. After receiving the M-SEARCH response message, the network management device 12 adds the device information of the management target device 13 to the device information database of the device information storage unit 123 as follows.

  First, the connection management unit 122 extracts the description URL of the managed device 13 that has transmitted the M-SEARCH response message from the received M-SEARCH response message (step S201). Next, the connection management unit 122 connects to the extracted description URL by using the HTTP protocol and transmits a device information request message (step S202). Here, the connection management unit 122 transmits a device information request message according to the SSDP protocol. The managed device 13 that has received this device information request message generates and returns a device information response message including a description describing the device information, and the connection management unit 122 receives the device information response message ( Step S203). The connection management unit 122 acquires device information from the received device information response message, generates a record including the acquired device information, and newly adds it to the device information database (step S204). Next, the connection management unit 122 updates the survival confirmation time of the record added in step S204 with the current time (step S205).

  FIG. 8 is a sequence diagram showing the procedure of the device information update process shown in FIG. After receiving the M-SEARCH response message, the network management device 12 updates the corresponding record in the device information database as follows.

  First, the connection management unit 122 extracts the description URL of the management target device 13 that has transmitted the M-SEARCH response message from the M-SEARCH response message received in step S102 illustrated in FIG. 6 (step S301). Next, the connection management unit 122 connects to the extracted description URL by using the HTTP protocol and transmits a device information request message (step S302). The managed device 13 that has received this device information request message generates and returns a device information response message including a description describing the device information, and the connection management unit 122 receives the device information response message ( Step S303). The connection management unit 122 acquires device information from the received device information response message, and updates the record of the management target device 13 that has transmitted the device information with the acquired device information (step S304). Next, the connection management unit 122 updates the survival confirmation time of the record updated in step S304 with the current time (step S305).

  In the present embodiment, the network management device 12 acquires device information every time it receives an M-SEARCH response message. However, the present invention is not limited to this, and the M-SEARCH response message is transmitted three times, for example. The device information may be acquired every time the M-SEARCH response message is received a predetermined number of times, such as acquiring the device information response message once for each reception. In this case, only the survival confirmation time of the record of the managed device 13 that has transmitted the M-SEARCH response message may be updated twice out of three receptions of the M-SEARCH response message.

  Next, the procedure of the polling request flag setting process shown in step S104 of FIG. 6 will be described. FIG. 9 is a flowchart showing the polling request flag setting process. First, the connection management unit 122 creates a received UUID list from the UUID included in the received M-SEARCH response message before the timeout time of step S102 in FIG. 6 elapses (step S401). Next, the connection management unit 122 extracts the UUID registered in the device information database and creates a registered UUID list (step S402). Next, the connection management unit 122 compares the received UUID list with the registered UUID list (step S403), and includes a UUID that is included in the registered UUID list but not included in the received UUID list. A polling request flag is set in the polling request flag field of the record (step S404). As a result, the management target device 13 that has the device information stored in the device information database and has not transmitted the M-SEARCH response message is identified as the transmission target of the polling request message.

  Next, the polling process shown in FIG. 5 will be described. FIG. 10 is a sequence diagram illustrating the procedure of the polling process. In the example of FIG. 10, it is assumed that the polling request flag is set in the polling request flag field of the records of the three managed devices 13a to 13c. First, the polling unit 124 reads records in the device information database in ascending order and starts a process of extracting a record in which the polling request flag is set in the polling request flag field. Then, since the polling request flag is set in the record of the management target device 13a, the polling unit 124 extracts the record of the management target device 13a (step S501).

  Next, the polling unit 124 reads the count value of the management target device 13a held by the polling counting unit 125 from the polling counting unit 125 (step S502), and whether the read count value is less than a predetermined reference transmission count. If it is less than the reference transmission count, the IP address of the management target device 13a is read from the record of the management target device 13a, and a polling request message is transmitted to the management target device 13a (step S503). At this time, the polling unit 124 causes the timer 126 to start measuring a predetermined period of the polling request message. Here, the polling unit 124 transmits the polling request message to the management target device 13a because the count value by the polling counting unit 125 of the management target device 13a is 0 and less than the reference transmission count (5 times).

  Then, the polling unit 124 deletes the polling request flag from the record of the management target device 13a that has transmitted the polling request message.

  Next, the polling unit 124 increments the count value of the management target device 13a held by the polling counting unit 125 by 1 (step S504).

  The managed device 13a that has received this polling request message transmits a polling response message to the network management device 12. Upon receiving this polling response message, the polling unit 124 updates the survival confirmation time of the record of the management target device 13a with the current time.

  Next, the polling unit 124 records the record of the management target device 13b that is a record having a record management number larger than the record extracted in step S501 and in which the polling request flag is set in the polling request flag field. Extract (step S505). Next, the polling unit 124 reads the count value from the polling counting unit 125 of the management target device 13b from the polling counting unit 125 (step S506).

  Here, the polling unit 124 transmits a polling request message to the management target device 13b because the count value by the polling counting unit 125 of the management target device 13b is 1 and is less than the reference transmission count of 5 (step S1). S507). Here, the polling unit 124 transmits a polling request message to the management target device 13a, and transmits the polling request message when the first trigger signal is output after the timer 126 is operated. In addition, the polling unit 124 deletes the polling request flag from the record of the management target device 13b that has transmitted the polling request message.

  Next, the polling unit 124 extracts a record of the managed device 13c that has a record number larger than the record extracted in step S505 and has a polling request flag set in the polling request flag field. (Step S508).

  Next, the polling unit 124 reads out the count value by the polling counting unit 125 of the management target device 13c from the polling counting unit 125 (step S509). Here, the polling unit 124 does not transmit the polling request message to the management target device 13c because the count value of the management target device 13c is 5 and is equal to or greater than the reference transmission count (step S510).

  Next, since the polling unit 124 did not transmit the polling request message to the management target device 13c, the polling unit 124 resets the count value of the management target device 13c held by the polling counting unit 125.

  Next, the polling unit 124 ends the polling process because the record number is larger than the record management number of the record of the management target device 13c and no polling request flag is set. The process proceeds to connection management processing (step S512).

  That is, the polling unit 124 extracts a record in which the polling request flag is set from the device information database, and the count value by the polling counting unit 125 of the management target device 13 of the extracted record is the reference transmission count (5 times). In this case, the polling request message is not transmitted to the managed device 13. For this reason, the management target device 13 of the record in which the polling request flag is set does not transmit the polling request message once out of five times, the number of polling request messages can be reduced, and the load on the polling process is increased. Concentration can be avoided.

  As shown in step S511 in FIG. 10, the polling unit 124 resets the count value by the polling counting unit 125 of the management target device 13c when the polling request message is not transmitted, but the present invention is not limited to this. In other words, the polling unit 124 sets the count value of the management target device 13c to the polling count unit 125 every time the polling process is executed even if the count value by the polling count unit 125 of the management target device 13c exceeds the reference transmission count. The count value of the management target device 13c held by the polling counter 125 may be reset when the count value reaches a predetermined value (for example, 10 times) larger than the reference transmission count. . Thereby, although the polling request flag is set, the number of managed devices 13 to which the polling request message is transmitted is reduced, and it is possible to further avoid the load being concentrated on the polling process.

  As described above, according to the network management system of the present embodiment, the connection management unit 122 multicasts an M-SEARCH request message to the management target device 13. The managed device 13 that has received the M-SEARCH request message transmits an M-SEARCH response message to the network management device 12. The network management apparatus 12 sets a polling request flag in the record of the management target device 13 that has not received the M-SEARCH response among the management target devices 13 whose device information is stored in the device information storage unit 123. Then, it is specified as the management target device 13 that requires the polling process.

  Then, the network management device 12 sequentially transmits a polling request message to the management target device 13 that requires the polling process, and each time the polling request message is transmitted, the network management device 12 sets the polling request flag of the management target device 13. The count value by the polling counter 125 is increased. Then, the network management device 12 does not transmit a polling request message to the management target device 13 whose count value by the polling counter 125 is equal to or greater than the reference transmission count. Therefore, it is possible to avoid the load from being concentrated on the polling process.

  In the above embodiment, the reference transmission number storage unit 127 stores one type of reference transmission number, but is not limited to this, and a reference transmission number table including a plurality of reference transmission numbers as shown in FIG. May be stored. FIG. 11 is a data structure diagram of the reference transmission frequency table. The reference transmission frequency table shown in FIG. 11 includes a device type field and a reference transmission frequency field. Data indicating the type of the management target device 13 is stored in the device type field. Device types include PCs (personal computers), wireless LAN terminals, gateways, switching hubs, and the like.

  The reference transmission frequency field stores the reference transmission frequency for the device type. In the example of FIG. 11, 5, 7, 2, and 1 are set as the reference transmission times of the PC (personal computer), wireless LAN terminal, gateway, and switching hub, respectively.

  These reference transmission times are merely examples, and other values may be adopted. In addition, the types of devices stored in the reference transmission frequency table are not limited to those shown in FIG. 11, and other devices such as a television, a DVD recorder, and a refrigerator may be included.

  When starting the polling process, the polling unit 124 reads the type of the device included in the record in which the polling request flag is set, and uses the reference transmission count of each of the management target devices 13 in the record in which the polling request flag is set as a reference. Read from the transmission count table. Note that when the type of device included in the record in which the polling request flag is set is not included in the reference transmission count table, the polling unit 124 stores it in the reference transmission count field for other fields in the reference transmission count table. The reference transmission frequency (5 times) is set as the reference transmission frequency of the record.

  Then, the polling unit 124 sets the maximum reference transmission count among the read reference transmission counts as the reference transmission count in the polling process. Specifically, if the polling request flag is set in the record of the management target device 13 of the PC, wireless LAN, and gateway, the polling unit 124 refers to the reference transmission count table, and determines the PC, wireless LAN, and gateway. Among the reference transmission times “5”, “7”, and “2”, the maximum value “7” is set as the reference transmission frequency in the polling process. Then, the polling unit 124 transmits a polling request message to the PC, the wireless LAN, and the gateway until the count value by the polling counting unit 125 of the PC, the wireless LAN, and the gateway becomes 7. Note that the polling unit 124 may set an average value, a median value, or the like as the reference transmission count in the polling process instead of the maximum value. With this configuration, it is possible to flexibly set the reference transmission count in the polling process according to the type of the management target device 13.

  The network management device and network management system according to the present invention are useful as a management device for network devices. It can also be applied to home communication devices such as home gateways.

1 shows a network configuration diagram of a network management system according to an embodiment of the present invention. FIG. It is a functional block diagram of the network management apparatus 12 shown in FIG. It is the figure which showed the data structure of the apparatus information database. It is a functional block diagram of the management object apparatus shown in FIG. It is a sequence diagram which shows the process of the connection management part and polling part which are shown in FIG. 6 shows a flowchart of the connection management process shown in FIG. It is a sequence diagram which shows the procedure of an apparatus information addition process. It is a sequence diagram which shows the procedure of an apparatus information update process. It is a flowchart which shows a polling request flag set process. It is a sequence diagram which shows the procedure of the polling process shown in FIG. It is a data structure figure of a reference | standard transmission frequency table. It is a block diagram of the conventional network management system.

Explanation of symbols

11 Network 12 Network Management Device 13 Managed Device 121 Communication Unit 122 Connection Management Unit 123 Device Information Storage Unit 124 Polling Unit 125 Polling Count Unit 126 Timer 127 Reference Transmission Number Storage Unit 131 Communication Unit 132 M-SEARCH Transmission / Reception Unit 133 Description Distribution 134 ssdp: alive transmission unit

Claims (10)

  1. A network management device for managing a plurality of managed devices connected via a network,
    Device information storage means for storing device information of the device to be managed;
    Transmitting a detection request message for detecting entry of the managed device into the network to the managed device, receiving a detection response message transmitted from the managed device that has received the detection request message, and the device information A connection management unit that identifies a management target device that has not transmitted the detection response message among management target devices whose device information is stored in a storage unit, as a polling management target device that transmits a polling request message;
    A polling request message for detecting whether or not the connection to the network is continued is transmitted to the polling management target device, and a polling response message transmitted from the polling management target device that has received the polling request message A polling means to receive;
    Polling counting means for counting the number of times a polling request message is transmitted for each polling management target device,
    The network management apparatus, wherein the polling unit transmits the polling request message to a polling management target device whose count value by the polling counting unit is less than a predetermined reference transmission count.
  2. In order to transmit the polling request message at a constant cycle, the device further comprises a time measuring means for measuring the fixed cycle,
    2. The network management device according to claim 1, wherein the polling unit transmits the polling request message at a constant period based on a timing result by the timing unit.
  3.   The network management apparatus according to claim 1, wherein the connection management unit transmits the detection request message according to a predetermined first protocol and acquires the device information according to the first protocol.
  4. The detection response message includes location information indicating a storage position of device information of a management target device that transmits the detection response message,
    The network management apparatus according to claim 3, wherein the connection management unit acquires the device information from a storage position indicated by the location information.
  5.   The network management apparatus according to claim 4, wherein the location information is a URI in an HTTP protocol.
  6. The first protocol is a universal plug and play SSDP protocol;
    The network management apparatus according to claim 3, wherein the detection request message includes an M-SEARCH method.
  7. The polling means transmits the polling request message in a second protocol different from the first protocol;
    The network management apparatus according to claim 3, wherein the second protocol is a UDP protocol.
  8. The polling means transmits the polling request message in a second protocol different from the first protocol;
    The network management apparatus according to claim 3, wherein the second protocol is an ICMP protocol.
  9. The device information includes information indicating the type of device for each managed device,
    Reference transmission number storage means for storing in advance a reference transmission number for each type of the management target device,
    The polling unit specifies a device type for each polling management target device from the device information, and refers to the reference transmission number storage unit by using the specified device type, and a reference transmission number for each polling management target device. , Further specifying a representative value of the specified reference transmission count, and transmitting the polling request message to a polling management target device whose count value by the polling counting means is less than the representative value. The network management device according to claim 1.
  10. A network management system comprising a network management device that manages a management target device and a plurality of management target devices connected to the network management device via a network,
    The network management device includes:
    Device information storage means for storing device information of the device to be managed;
    Transmitting a detection request message for detecting entry of the managed device into the network to the managed device, receiving a detection response message transmitted from the managed device that transmitted the detection request message, and the device information A connection management unit that identifies a management target device that has not transmitted the detection response message as a polling management target device that transmits a polling request message, among the management target devices whose device information is stored in the storage unit;
    A polling request message for detecting whether or not the connection to the network is continued is transmitted to the polling management target device, and a polling response message transmitted from the polling management target device that has received the polling request message A polling means to receive;
    Polling counting means for counting the number of times a polling request message is transmitted for each polling management target device,
    The managed device is
    A detection message transmitting / receiving means for receiving the detection request message and transmitting the detection response message;
    A polling message transmission / reception means for receiving the polling request message and transmitting the polling response message;
    The network management system according to claim 1, wherein the polling unit of the network management device transmits a polling request message to a polling management target device whose count value by the polling counting unit is less than a predetermined reference transmission count.
JP2006155727A 2006-06-05 2006-06-05 Network management apparatus and network management system Pending JP2007325155A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011055189A (en) * 2009-09-01 2011-03-17 Canon Inc Content providing apparatus and content processing method
JP2012113659A (en) * 2010-11-26 2012-06-14 Fujitsu Ltd Apparatus detection device and apparatus detection program
JP2013207367A (en) * 2012-03-27 2013-10-07 Nippon Telegr & Teleph Corp <Ntt> Network fault monitoring device and network fault monitoring method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011055189A (en) * 2009-09-01 2011-03-17 Canon Inc Content providing apparatus and content processing method
JP2012113659A (en) * 2010-11-26 2012-06-14 Fujitsu Ltd Apparatus detection device and apparatus detection program
JP2013207367A (en) * 2012-03-27 2013-10-07 Nippon Telegr & Teleph Corp <Ntt> Network fault monitoring device and network fault monitoring method

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