JP2006080615A - Method and apparatus for managing network, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To collect MIB (management information base) information without adversely influencing the original performance of a network apparatus. <P>SOLUTION: When an NMS (network management station) 1 collects the MIB information from the network apparatus 2, a CPU utilization factor of the network apparatus 2 is firstly checked. If a load is high, the number of items of the MIB information acquired in a one-time SNMP packet is decided so that the acquired number may be reduced, and the transmission interval of the SNMP packet is decided so that the transmission interval may be prolonged. Next, the SNMP packet created in accordance with the decided number of items of MIB information is transmitted from the NMS1 to the network apparatus 2 at the decided transmission interval, thereby collecting the MIB information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a network management method, and more particularly to a network management method for collecting management information of a network device by a network management device.

  In a network management system that performs management work of network devices such as routers constituting the Internet via a network, SNMP (Simple Network Management Protocol) is mainly used as a network management protocol. In this case, the management target device is implemented with a management information base (MIB) in which the agent and the state and settings of the device are stored in a database, for communication between the network management station (NMS) (network management station) and the agent. SNMP is used. Network device status management is realized by reading MIB variables, and network device settings are realized by MIB variable settings. The network device failure report uses an SNMP trap mechanism from the agent to the NMS. The present invention relates to an improvement in a method of collecting MIB information of a network device by the network management device among such network management.

  Conventionally, when acquiring MIB information from a network device using SNMP, the NMS packs a list of MIB information (Variable Binding List) to be acquired in an SNMP packet (PDU) and transmits the information to the network device. At this time, the SNMP packet is normally packed with a list of MIB information up to the maximum number of bytes of the SNMP packet. Further, when the list of all MIB information to be acquired cannot be accommodated in one SNMP packet, two or more SNMP packets are used and the plurality of SNMP packets are continuously transmitted.

  Prior arts of this type of network management method are described in Patent Document 1 and Patent Document 2.

  In Patent Document 1, if MIB information of a network device is to be collected every certain period t, if an acquisition request is issued from the NMS to the network device every period t, a large amount of request packets and response packets flow through the network. Therefore, in order to prevent this, the NMS transmits a request packet designating the number of accumulations to the network device, and the network device collects information for the number of accumulations at a designated time interval, and then collects the collected information into one response packet. The technique of transmitting to NMS is described.

In Patent Document 2, when the performance change such as the CPU load ratio of the network device is severe, the polling interval from the NMS is shortened to obtain detailed performance information, and when the performance change is gradual, the polling interval is lengthened. A technique for suppressing useless communication with a network is described.
JP-A-8-265367 Japanese Patent Laid-Open No. 11-154955

  As the functions of network devices improve, the types and number of interfaces have increased, and the number of MIB information monitored by the NMS has increased accordingly. For this reason, SNMP packets filled with a large list of MIB information are frequently transmitted from the NMS to the network device. The reception of SNMP packets, the decomposition of the MIB information list in the received packets, the acquisition of the relevant MIB information and the assembly of response packets, and the transmission of response packets increase the load on the network device and increase the original throughput of the network device. It causes a decrease.

  The prior arts described in Patent Documents 1 and 2 are both suitable for reducing the load on the network, but have no effect of reducing the load on the network device, and may increase the load. This is because, in Patent Document 1, which causes a network device to collect information corresponding to the number of times of accumulation at a specified time interval, the load on the network device is increased. Further, in Patent Document 2, when the CPU load factor of the network device changes drastically in a high range, the polling interval is set to be short, so that the load on the network device is further increased.

  An object of the present invention is to provide a novel network management method and network management apparatus that do not adversely affect the original performance of the network apparatus as much as possible.

  Another object of the present invention is a novel network management that adjusts one or both of the number of management information acquired by one information acquisition request and the transmission interval of the information acquisition request according to the load status of the network device. To provide a method and a network management device.

  In the first network management method of the present invention, a) the network management device confirms the load status of the managed device, and b) the network management device obtains the acquired number as the confirmed managed device load increases. A step of determining the number of pieces of management information acquired by one information acquisition request so as to reduce, c) the network management device transmits an information acquisition request created according to the determined number of acquisitions to the managed device, Receiving management information sent from the managed device.

  In the second network management method of the present invention, a) the network management device confirms the load status of the managed device, and b) the transmission interval increases as the load of the confirmed managed device increases. A step of determining an information acquisition request transmission interval so as to be longer; c) a management in which the network management device transmits an information acquisition request to the managed device at the determined transmission interval and is sent from the managed device. Receiving the information.

  In the third network management method of the present invention, a) the network management device confirms the load status of the managed device, b) the network management device acquires the higher the load of the confirmed managed device. Determining the number of pieces of management information to be acquired by one information acquisition request so that the number of pieces of information is acquired and determining the transmission interval of information acquisition requests so that the transmission interval is long; c) the network management device determines the determination A step of transmitting an information acquisition request created according to the acquired number to the managed device at the determined transmission interval, and receiving management information sent from the managed device.

  According to a fourth network management method of the present invention, in the third network management method, d) after acquiring the management information from the managed device in step c, the network management device again checks the load status of the managed device. E) step of confirming, e) according to the difference or ratio between the load status confirmed in step a and the load status confirmed in step d, the load of the managed device and the management information acquired by one information acquisition request Changing the relationship between the number and the transmission interval of the information acquisition request.

  The first network management device of the present invention includes a load status confirmation unit for confirming a load status of the managed device, and information acquisition once so that the number of acquisitions decreases as the load of the confirmed managed device increases. Monitoring traffic determining means for determining the number of management information acquired by the request, and an information acquisition request created according to the determined acquisition number is transmitted to the managed device, and the management information sent from the managed device is transmitted The management information acquisition means to receive is provided.

  The second network management device of the present invention includes a load status confirmation unit for confirming a load status of the managed device, and transmission of an information acquisition request so that the transmission interval becomes longer as the load of the confirmed managed device is higher. Monitoring traffic determining means for determining an interval; and management information acquiring means for transmitting an information acquisition request to the managed device at the determined transmission interval and receiving management information sent from the managed device. It is characterized by that.

  The third network management device according to the present invention includes a load status confirmation unit for confirming a load status of the managed device, and information once so that the acquired number decreases as the load of the confirmed managed device increases. The monitoring traffic determining means for determining the transmission interval of the information acquisition request so as to increase the transmission interval while determining the number of management information acquired by the acquisition request, and the information acquisition request created according to the determined acquisition number, Management information acquisition means for transmitting to the managed device at a determined transmission interval and receiving management information sent from the managed device is provided.

  The fourth network management device according to the present invention is a load status reconfirmation in the third network management device, wherein the management information acquisition means re-checks the load status of the managed device after acquiring the management information from the managed device. And the load size of the managed apparatus and one information acquisition request according to the difference or ratio between the load status confirmed by the load status confirmation means and the load status confirmed by the load status reconfirmation means And adjusting means for changing the relationship between the number of pieces of management information acquired in step 1 and the transmission interval of information acquisition requests.

"Action"
In the network management method and apparatus of the present invention, when the network management apparatus collects management information from the managed apparatus, the load status of the managed apparatus, such as the CPU usage rate, is first checked, and the load of the managed apparatus If the number is high, the number of management information to be acquired by one information acquisition request is determined so that the number of acquisition is small, or the transmission interval of the information acquisition request is determined so that the transmission interval is long, and the determined acquisition By transmitting information acquisition requests created according to the number to the managed device at the determined transmission interval, management information is collected from the managed device without adversely affecting the original performance of the managed device.

  According to the first network management method and apparatus of the present invention, the influence on the original performance of the managed apparatus can be reduced. The reason is that the load status of the managed device such as the CPU usage rate is confirmed. If the load on the managed device is high, the number of management information acquired by one information acquisition request is reduced, and the load on the managed device is reduced. This is because it tries to keep the height as low as possible. Further, according to the first network management method and apparatus of the present invention, information can be collected at high speed for a managed apparatus with a low load such as a CPU usage rate. The reason is that the number of pieces of management information acquired by one information acquisition request increases if the load status such as the CPU usage rate of the managed device is confirmed and the load of the managed device is low.

  According to the second network management method and apparatus of the present invention, the influence on the original performance of the managed apparatus can be reduced. The reason for this is to check the load status such as the CPU usage rate of the managed device, and if the load on the managed device is high, increase the transmission interval of the information acquisition request so that the load on the managed device is not increased as much as possible. Because it is. In addition, according to the second network management method and apparatus of the present invention, information can be collected at high speed for a managed apparatus with a low load such as a CPU usage rate. This is because the load status such as the CPU usage rate of the managed device is confirmed, and if the load of the managed device is low, the transmission interval of the information acquisition request is shortened.

  According to the third network management method and apparatus of the present invention, the influence on the original performance of the managed apparatus can be reduced. The reason is that the load status such as the CPU usage rate of the managed device is confirmed, and if the load of the managed device is high, the number of pieces of management information acquired by one information acquisition request is reduced and the transmission interval of the information acquisition request This is because the load on the managed device is not increased as much as possible. Further, according to the first network management method and apparatus of the present invention, information can be collected at high speed for a managed apparatus with a low load such as a CPU usage rate. The reason is that the load status such as the CPU usage rate of the managed device is confirmed. If the load of the managed device is low, the number of pieces of management information acquired by one information acquisition request is large and the transmission interval of the information acquisition request Because it becomes shorter.

  According to the fourth network management method and apparatus of the present invention, the relationship between the load of the managed device, the number of pieces of management information acquired by one information acquisition request, and the transmission interval of the information acquisition request Corrections can be made for each managed device. The reason is that according to the difference or ratio of the load status before and after the collection of management information from the managed device, the size of the load of the managed device, the number of management information acquired by one information acquisition request, and information acquisition This is because the relationship with the request transmission interval is changed.

  Referring to FIG. 1, a network management system that implements the network management method of the present invention includes an NMS 1 and a network device 2 and a network device 3 connected to each other through a network (not shown). Although only two network devices are illustrated in FIG. 1, there are generally a large number of three or more network devices.

  In this embodiment, when the NMS 1 collects MIB information of the network device 2 by SNMP communication, first, the CPU usage rate of the network device 2 is confirmed, and the higher the CPU usage rate, the more MIB information to be acquired. The number of MIB information acquired by one SNMP request packet is determined so as to decrease, and the transmission interval of SNMP request packets is determined so that the transmission interval becomes longer. Then, the NMS 1 transmits the SNMP request packet generated according to the determined number of acquired MIB information to the network device 2 at the determined transmission interval, and receives the SNMP response packet transmitted from the network device 2. . The same applies when collecting MIB information of other network devices 3.

  Referring to the example appended to FIG. 1 and FIG. 2, during SNMP communication from the NMS 1 to the network device 2, because the CPU usage rate of the network device 2 is as high as 90%, for example, the number of MIB information requested in one SNMP request packet 1 and the transmission interval until the transmission of the next SNMP request packet is 100 ms, an SNMP Get request is made.

  On the other hand, at the time of SNMP communication from the NMS 1 to the network device 3, since the CPU usage rate of the network device 2 is as low as 10%, for example, the number of MIB information requested by one SNMP request packet is 10, and the next SNMP request packet is transmitted. The SNMP Get request is performed with the transmission interval up to 10 ms.

  As a result, MIB information can be collected by SNMP communication so as to reduce the increase in the CPU usage rate to the network device 2 having a high load, and the total time required for the SNMP communication is reduced to a device having a low load. can do.

  Referring to FIG. 3, the NMS 1 includes a manager unit 11 and a protocol stack 12, and is connected to the management console 4 and the network 5. The protocol stack 12 includes a network management protocol (SNMP in this embodiment) 13 and its lower protocol stack 14, the lower protocol stack 14 is connected to the network 5, and the network management protocol 13 is connected to the manager unit 11. The The manager unit 11 has a function of issuing operations and commands such as GET and SET to the management information to the agent and interacting with the operator through the management console 4. As a function related to the present invention, the manager unit 11 includes a load status confirmation unit 15 that confirms the load status of the network management devices 2 and 3, once so that the higher the confirmed load, the smaller the number of acquired MIB information. The monitoring traffic determination unit 16 that determines the number of MIB information to be acquired by the SNMP request packet and determines the transmission interval of the SNMP request packet so that the transmission interval becomes longer, and the SNMP request packet created according to the determined number of MIB information The management information acquisition unit 17 receives the SNMP response packet transmitted from the managed device and transmitted to the managed device at the determined transmission interval.

  Referring also to FIG. 3, the network device 2 includes an agent unit 21, a protocol stack 22, and an MIB 23 and is connected to the network 5. The protocol stack 22 includes a network management protocol (SNMP in this embodiment) 24 and its lower protocol stack 25, the lower protocol stack 25 is connected to the network 5, and the network management protocol 24 is connected to the agent unit 21. The The MIB 23 stores the status and settings of various devices such as the CPU and interface devices that constitute the network device 2. The agent unit 21 has a function of referring to the status of the management target from the MIB 23 in response to a request from the manager unit 11 and performing an operation on the management target. Other network devices 3 have the same configuration as the network device 2.

  FIG. 4 shows a processing flow on the NMS 1 side when SNMP communication is performed from the NMS 1 to the network devices 2 and 3. Note that the CPU usage rates (%) AA to ZZ in the figure have a relationship of AA> BB> CC>...> XX> YY> ZZ, and the number of MIB information (pieces) a to z in one packet. Has a relationship of a ≦ b ≦ c ≦ …… ≦ x ≦ y ≦ z, and SNMP packet transmission intervals (ms) aa to zz have a relationship of aa ≧ bb ≧ cc ≧ …… ≧ xx ≧ yy ≧ zz. There is.

  Referring to FIG. 4, when the manager unit 11 of the NMS 1 starts SNMP communication for collecting MIB information of a certain network device, the load status confirmation unit 15 first acquires the CPU usage rate of the network device (step A1). The CPU usage rate can be acquired in the same manner as other MIB information collection described below when the CPU usage rate is stored in the MIB of the network device as one of the MIB information. . Of course, the method is not limited to such a method, and the CPU usage rate of the network device may be acquired by any method.

  Next, the manager unit 11 of the NMS 1 uses the monitoring traffic determination unit 16 to obtain a plurality of CPU usage rates (AA or more, BB or more and less than AA) in which the acquired CPU usage rate is defined by the reference CPU usage rates of AA to ZZ. , More than CC and less than DD,..., Less than ZZ) (steps A2 to A6), and a predetermined number of MIB information and transmission intervals are selected according to the category ( Steps A7 to A11). Then, the manager unit 11 uses the management information acquisition unit 17 to transmit, via the protocol stack 12, an SNMP request packet related to an SNMP Get request or GetNext request in which a list of MIB information corresponding to the number of the selected MIB information items is set. The process of transmitting to is repeated at the selected transmission interval, and an SNMP response packet returned from the network device is received for each SNMP request packet (step A12). The total number of SNMP request packets to be transmitted is determined by the total number of MIB information to be acquired and the number of acquisitions per acquisition. On the network device side that has received the SNMP request packet, the agent unit 21 analyzes the MIB information list, acquires each MIB information from the MIB 23, incorporates it into the response packet, and transmits it to the manager unit 11.

  Referring to FIG. 5 showing a sequence of SNMP communication from the NMS 1 to the network devices 2 and 3, when the NMS 1 performs SNMP communication to the network device 2, first, the network device 2 is inquired about the CPU usage rate. In this example, since the response from the network device 2 is BB% (S1 in FIG. 5), the condition of step A3 in FIG. 4 is satisfied, and the number of MIB information in one SNMP request packet is b in step A8. The transmission interval until the next SNMP request packet is transmitted is set to bb milliseconds, and SNMP communication is started in step A12 (S2 in FIG. 5).

  When the NMS 1 performs SNMP communication to the network device 3, first, the network device 3 is inquired about the CPU usage rate (S3 in FIG. 5). In this example, since the response from the network 3 is smaller than ZZ%, it does not meet any of the conditions A2 to A6 in FIG. 4, and the number of MIB information in one SNMP request packet in step A11 is z, Is set to zz milliseconds, and SNMP communication is started in step A12 (S4 in FIG. 5).

  When the NMS 1 performs SNMP communication to the network device 2 again, the CPU usage rate inquiry is performed again (S5 in FIG. 5). In this example, since the response from the network device 2 is CC%, the condition of step A4 in FIG. 4 is met, and in step A9, the number of MIB information in one SNMP request packet is c, and the next SNMP request packet Is set to cc milliseconds, and SNMP communication is started in step A12 (S6 in FIG. 5).

  Next, the effect of this embodiment will be described. According to the present embodiment, when collecting the MIB information of the network devices 1 and 2, the manager unit 11 confirms the CPU usage rate of the network devices 1 and 2 immediately before that, and when the load is high, In order to reduce the number of MIB information acquired at the same time and to increase the transmission interval of request packets, it is possible to suppress the degree of increase in the load of a network device with a high load due to SNMP communication. Can be prevented. On the other hand, for a network device with a low load, since the number of acquired MIB information per request packet is increased and the transmission interval of request packets is shortened, high-speed collection can be realized.

  Further, in the present embodiment, three or more CPU usage rate categories (AA or more, BB or more but less than AA, CC or more than less than DD,..., Less than ZZ defined by a plurality of reference CPU usage rates of AA to ZZ. ) To determine which category the CPU usage rate of the network device belongs to, and to select a MIB information number and a transmission interval that are determined in advance according to the category to which the network device CPU usage rate belongs. There is an effect that the number of information and the transmission interval can be set finely.

"Modification of this embodiment"
In the present embodiment, the manager unit 11 determines both the number of acquired MIB information per request packet and the request packet transmission interval according to the CPU usage rate of the network device. Either one is a fixed value or an arbitrary value. An embodiment is also conceivable in which the other is determined according to the CPU usage rate of the network device.

  In the present embodiment, the manager unit 11 uses the CPU usage rate as the load status of the network device. However, an embodiment in which the usage rate of the memory (main memory) or the like is confirmed as an index representing the load status is also conceivable.

  In this embodiment, the conditions for the CPU usage rate, the number of acquired MIB information per request packet, and the request packet transmission interval are the same for all network devices, but for each network device or group of network devices. An embodiment in which the condition is set is also conceivable.

[Other Embodiments of the Present Invention]
In the present embodiment, the conditions of the CPU usage rate, the number of acquired MIB information per request packet, and the request packet transmission interval are set for each network device, and the load status before and after information acquisition by actual SNMP communication is set. The change is observed, and the condition is optimized for each network device according to the degree of change.

  Referring to FIG. 6, the NMS 1 in the present embodiment is the same as the NMS 1 according to the embodiment shown in FIG. 3 in that the manager unit 11 includes a load status reconfirmation unit 18, an adjustment unit 19, and a constant table 1A. Is different. Referring to FIG. 7, the flow of processing on the NMS 1 side when performing SNMP communication from the NMS 1 to the network devices 2 and 3 in the present embodiment is the flowchart of FIG. 4 in that steps A 13 and A 14 are added. And different.

  The load status reconfirmation unit 18 confirms the CPU usage rate of the network device again after collecting the MIB information from the network device by the management information acquisition unit 17.

  In accordance with the difference or ratio between the CPU usage rate of the network device immediately before collection confirmed by the load status confirmation unit 15 and the CPU usage rate immediately after collection confirmed by the load status reconfirmation unit 18, the adjustment unit 19 The conditions of the CPU usage rate of the network device, the number of MIB information acquired per request packet, and the request packet transmission interval are changed as follows.

  First, the CPU usage rate (%) AA to ZZ, the number of MIB information (pieces) a to z in the packet, and the SNMP packet transmission interval (ms) aa to zz in FIG. A value to be assigned to the variable is set in the constant table 1A. FIG. 8 shows data related to the network device 2 set in the constant table 1A. A set of each variable and its value is set following the network device ID for uniquely identifying the network device 2. The same applies to other network devices 3.

  When the difference or ratio between the CPU usage rates before and after the collection of the network device 2 exceeds the upper limit threshold set in the adjustment unit 19 in advance, the adjustment unit 19 per packet of the network device 2 set in the constant table 1A The number of MIB information (pieces) a to z is reduced as a whole while maintaining the relationship a ≦ b ≦ c ≦ …… ≦ x ≦ y ≦ z, and the SNMP packet transmission interval (ms) aa The value of .about.zz is increased as a whole while maintaining the relationship of aa.gtoreq.bb.gtoreq.cc.gtoreq..gtoreq.xx.gtoreq.yy.gtoreq.zz. For example, if the CPU usage rate before collection is α and the CPU usage rate after collection is β, the difference in CPU usage rate is β-α, and the ratio of CPU usage rates is β / α. Assuming that the preset upper limit threshold value is ΔH, for example, when (β / α)> ΔH, the values of a to z are reduced by a value H1 (positive integer) preset in the adjustment unit 19, and aa to The value of zz is increased by a value H2 (positive integer) preset in the adjustment unit 19.

  On the other hand, if the difference or ratio of CPU usage before and after collection of the network device 2 is below the lower threshold, the number of MIB information (pieces) a to z per packet of the network device 2 set in the constant table 1A And the value of the SNMP packet transmission interval (ms) aa to zz is set to aa ≧ bb ≧, while maintaining the relationship of a ≦ b ≦ c ≦ …… ≦ x ≦ y ≦ z. While maintaining the relationship of cc ≧ …… ≧ xx ≧ yy ≧ zz, the overall size is reduced. For example, if the preset lower threshold is ΔL, for example, when (β / α) <ΔL, the value of a to z is increased by a value L1 (positive integer) preset in the adjustment unit 19, The values aa to zz are reduced by a value L2 (positive integer) preset in the adjustment unit 19.

  Next, the operation of the present embodiment will be described by taking as an example the case of SNMP communication with the network device 2. Referring to FIG. 7, when the manager unit 11 of the NMS 1 starts SNMP communication for collecting MIB information of the network device 2, first, the load status confirmation unit 15 acquires the CPU usage rate of the network device 2 (step A1). ). Next, the manager unit 11 of the NMS 1 uses the monitoring traffic determination unit 16 to obtain a plurality of CPU usage rates (AA or more, BB or more and less than AA) in which the acquired CPU usage rate is defined by the reference CPU usage rates of AA to ZZ. , More than CC and less than DD,..., Less than ZZ) (steps A2 to A6), and a predetermined number of MIB information and transmission intervals are selected according to the category ( Steps A7 to A11). Here, the manager unit 11 resolves the values of the variables AA to ZZ, a to z, and aa to zz with reference to the constant table 1A. Then, the manager unit 11 uses the management information acquisition unit 17 to transmit, via the protocol stack 12, an SNMP request packet related to an SNMP Get request or GetNext request in which a list of MIB information corresponding to the number of the selected MIB information items is set. The process of transmitting to is repeated at the selected transmission interval, and an SNMP response packet returned from the network device is received for each SNMP request packet (step A12).

  When the manager unit 11 of the NMS 1 finishes collecting the MIB information of the network device 2, the load status reconfirmation unit 18 confirms the CPU usage rate of the network device 2 again (step A13), and then the adjustment unit 19 As described above, the value of the variable related to the network device 2 set in the constant table 1A is changed according to the difference or ratio of the CPU usage rate before and after the collection (step A14). When the value of the variable is changed, the conditions of the CPU usage rate, the number of MIB information acquired per request packet, and the request packet transmission interval when the MIB information of the network device 2 is collected next time are changed. become.

  Next, the effect of this embodiment will be described. According to this embodiment, the same effect as the previous embodiment can be obtained, and the conditions of the CPU usage rate, the number of acquired MIB information per request packet, and the request packet transmission interval can be set for each network device. There is an effect that can be optimized. For example, in the case of a network device with low CPU performance, at the same CPU usage rate, the same number of acquired MIB information, and the same request packet transmission interval, the increase rate of the CPU usage rate during SNMP communication is larger than that of a network device with high CPU performance. Therefore, it is necessary to reduce the number of acquired MIB information per request packet and lengthen the transmission interval to suppress the increase in the CPU usage rate. According to the present embodiment, it is possible to automatically perform such a condition setting adjustment operation for each network device.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various other additions and modifications can be made. In addition, the network management device of the present invention can be realized by a computer and a program, as well as by hardware. The program is provided by being recorded on a computer-readable recording medium such as a magnetic disk or a semiconductor memory, and is read by the computer at the time of starting up the computer, etc. The load status confirmation unit 15, the monitoring traffic determination unit 16, the management information acquisition unit 17, the load status reconfirmation unit 18, and the adjustment unit 19 in the form of

It is a block diagram of the network management system which enforces the network management method of this invention. It is a sequence chart which shows the outline | summary of the network management method of this invention. It is a block diagram of NMS and a network device concerning an embodiment of the invention. It is a flowchart which shows the flow of a process by the side of NMS at the time of performing SNMP communication from NMS to a network device in embodiment of this invention. It is a sequence chart of SNMP communication from NMS to a network device in an embodiment of the invention. It is a block diagram of NMS and a network device concerning another embodiment of the present invention. It is a flowchart which shows the flow of a process by the side of NMS at the time of performing SNMP communication from NMS to a network device in another embodiment of this invention. It is a figure which shows the example of the content of the constant table which the manager part of NMS in another embodiment of this invention has.

Explanation of symbols

1 ... NMS (Network Management Station)
DESCRIPTION OF SYMBOLS 11 ... Manager part 12 ... Protocol stack 13 ... Network management protocol (SNMP)
DESCRIPTION OF SYMBOLS 14 ... Lower layer protocol stack 15 ... Load condition confirmation part 16 ... Monitoring traffic determination part 17 ... Management information acquisition part 18 ... Load condition reconfirmation part 19 ... Adjustment part 1A ... Constant table 2, 3 ... Network apparatus 21 ... Agent part 22 ... Protocol stack 23 ... MIB
24 ... Network management protocol (SNMP)
25: Lower protocol stack

Claims (12)

a) the network management device confirming the load status of the managed device;
b) a step in which the network management apparatus determines the number of pieces of management information to be acquired by a single information acquisition request so that the number of acquisitions decreases as the load of the checked managed apparatus increases.
c) a step in which the network management device transmits an information acquisition request created according to the determined number of acquisitions to the managed device and receives management information sent from the managed device;
A network management method comprising: a) the network management device confirming the load status of the managed device;
b) the network management device determining the transmission interval of the information acquisition request so that the transmission interval becomes longer as the load of the confirmed managed device is higher;
c) a step in which the network management apparatus transmits an information acquisition request to the managed apparatus at the determined transmission interval, and receives management information sent from the managed apparatus;
A network management method comprising: a) the network management device confirming the load status of the managed device;
b) The network management apparatus determines the number of pieces of management information to be acquired by one information acquisition request so that the acquired number decreases as the load of the confirmed managed apparatus increases, and the transmission interval becomes longer. Determining an information acquisition request transmission interval;
c) a step in which the network management device transmits an information acquisition request created according to the determined number of acquisitions to the managed device at the determined transmission interval and receives management information sent from the managed device ,
A network management method comprising: d) after the management information is acquired from the managed device in step c, the network management device reconfirms the load status of the managed device;
e) Depending on the difference or ratio between the load status confirmed in step a and the load status confirmed in step d, the size of the load on the managed device, the number of management information acquired in one information acquisition request, and information acquisition Changing the relationship with the request sending interval,
The network management method according to claim 3, further comprising:   The load status confirmation means for confirming the load status of the managed device, and the number of pieces of management information to be acquired by one information acquisition request are determined so that the acquired number decreases as the load of the confirmed managed device increases. Monitoring traffic determination means, and management information acquisition means for transmitting an information acquisition request created according to the determined acquisition number to the managed device and receiving management information sent from the managed device. A network management device characterized.   Load status checking means for checking the load status of the managed device, monitoring traffic determining means for determining the transmission interval of the information acquisition request so that the transmission interval becomes longer as the load of the checked managed device is higher, and information A network management apparatus comprising: management information acquisition means for transmitting an acquisition request to the managed apparatus at the determined transmission interval and receiving management information transmitted from the managed apparatus.   The load status confirmation means for confirming the load status of the managed device, and the number of pieces of management information acquired by one information acquisition request is determined so that the acquired number decreases as the load of the confirmed managed device increases. Monitoring traffic determining means for determining the transmission interval of the information acquisition request so that the transmission interval becomes long, and the information acquisition request created according to the determined number of acquisitions to the managed device at the determined transmission interval And a management information acquisition means for receiving management information sent from the managed device.   After the management information is acquired from the managed device by the management information acquisition unit, a load status reconfirming unit for reconfirming the load status of the managed device, the load status confirmed by the load status confirming unit, and the load status re-establishment Change the relationship between the size of the load on the managed device, the number of management information acquired in one information acquisition request, and the transmission interval of the information acquisition request according to the difference or ratio with the load status confirmed by the confirmation means The network management apparatus according to claim 7, further comprising an adjusting unit configured to perform adjustment.   The computer constituting the network management device is acquired by a load status confirmation means for confirming the load status of the managed device, and by one information acquisition request so that the acquired number decreases as the load of the confirmed managed device increases. Monitoring traffic determining means for determining the number of management information to be transmitted, management information for transmitting an information acquisition request created according to the determined acquisition number to the managed device and receiving management information sent from the managed device A program for functioning as an acquisition means.   Load status confirmation means for confirming the load status of the managed device for the computer constituting the network management device, and determining the transmission interval of the information acquisition request so that the transmission interval becomes longer as the load of the confirmed managed device is higher A program for functioning as monitoring traffic determining means for performing management information acquisition means for transmitting an information acquisition request to the managed device at the determined transmission interval and receiving management information transmitted from the managed device .   The computer constituting the network management device is loaded with a load status confirmation means for confirming the load status of the managed device, and by one information acquisition request so that the number of acquisitions decreases as the load of the checked managed device increases. Monitoring traffic determining means for determining the number of pieces of management information to be acquired and determining the transmission interval of the information acquisition request so that the transmission interval becomes long, and the information transmission request created according to the determined number of acquisitions to the determined transmission A program for functioning as a management information acquisition unit that transmits to a managed device at intervals and receives management information sent from the managed device.   The computer further includes a load status reconfirming means for reconfirming a load status of the managed device after the management information acquisition means acquires management information from the managed device, and a load status confirmed by the load status confirmation means; According to the difference or ratio with the load status confirmed by the load status reconfirmation means, the load size of the managed device, the number of management information acquired by one information acquisition request, and the transmission interval of the information acquisition request The program according to claim 11, wherein the program is made to function as an adjusting means for changing the relationship.

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