JP2009177783A - Network management system, edge node, and access device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify a data discarding point in a network. <P>SOLUTION: A network system for collecting, in a network including an access network and a transit network, pieces of statistical information including a traffic amount of the network, includes an access device coupled to the access network and an edge node for connecting the access network and the transit network, the access device being configured to measure pieces of statistical information including a traffic amount in the access device and to notify the edge node of the measured pieces of statistical information, and the edge node being collecting the pieces of statistical information notified by the access device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for collecting statistics and alarm information on the amount of data transferred over a network from an access terminal accommodating a user terminal installed at a remote location.

  An increasing number of carriers provide a bandwidth-guaranteed communication service using a packet transfer network instead of a conventional leased line service. The bandwidth-guaranteed communication service is a service in which a carrier installs an access device at a user site and the carrier guarantees a contract communication bandwidth between the access devices.

  A typical example of a packet transfer network is the Internet. The Internet was a service that assumed best effort. For this reason, there was a possibility that data was discarded along the way, but it was not necessary to know where and how much data was discarded.

  On the other hand, in the service that guarantees the contracted communication bandwidth, if the data transmitted from the user terminal in compliance with the guaranteed bandwidth is discarded in the packet transfer network provided by the carrier, the contract will be violated and the responsibility for payment of the penalty Occurs in the carrier.

  A network connecting user sites may not be connected by a single network, but may be configured by a plurality of networks such as an access network and a relay network. These multiple networks may have different management operators.

  Therefore, when a data discard or communication failure occurs, it is necessary to identify the failure or data discard location that occurred in the network including the access device and clarify the responsibility.

  The relay network includes an edge node and a relay node that connect the access network and the relay network. In a relay network, a control network for setting control information may be connected to these nodes. The administrator of the relay network can monitor statistical information of data passing through the relay node and failure information generated at the relay node through the control network.

There is ATM as a communication protocol for constructing a relay network. ATM defines OAM (Operation Administration and Maintenance). ATM OAM includes failure notification from a relay node and collection of statistical information limited within the scope of OAM.
JP 2001-111564 A

  Unlike a relay node, an access device installed at a user site is not connected to a control network. Therefore, the collection of statistical information collected by the access device cannot be collected through the control network like an edge node or a relay node. In addition, failure information collected by the access device together with statistical information cannot be collected through the control network like edge nodes and relay nodes.

  The technique disclosed in Patent Document 1 is a technique for collecting statistical information in a section monitored by ATM OAM. By using this technique, when the access network is ATM, statistics such as the amount of data transferred from the access device to the access network can be acquired. However, the statistical information that can be acquired with this technology is only the statistics transferred to the access network. That is, according to the present technology, statistical information that is out of the scope of the OAM, for example, the amount of data flowing from the user terminal to the access device cannot be acquired.

  In addition to the above statistical information, the administrator includes device failure information such as a component failure unique to the access device and communication alarm information such as a communication error detected as a result of a connection confirmation test between the access device and the opposite communication device. Could not even get.

  Therefore, when data is discarded in the access network, whether the data inflow occurred from the user terminal to the access device because it exceeded the contract bandwidth, or whether the data was discarded due to a malfunction of the access device, Alternatively, it becomes difficult to determine whether the disposal has occurred at a point other than the access device, and the responsibility for breach of the contract becomes unclear.

  Further, statistical information and alarm information (including device fault information and communication alarm information) to be acquired based on the installation position of the access device, the number of user terminals accommodated in the access device, the number of user terminal accommodation ports provided in the access device, and the like Varies in various ways.

  In the prior art, the information that can be acquired is uniform and the acquired information cannot be selected. Therefore, it is collected including unnecessary information. Since the number of access devices connected to the relay node is larger than the number of edge nodes and relay nodes, uniform collection of statistical information and alarm information is the edge node that collects access line bandwidth and information from the access device. This leads to an increase in load.

  The present invention has been made in view of such conventional problems.

  A first object of the present invention is to acquire statistical information from an access device connected to a relay node, and to specify a data discard point and a discard cause. Even for a service whose bandwidth is not guaranteed, the collected statistical information can be used to identify the cause of network congestion.

  A second object of the present invention is to acquire alarm information from an access device connected to a relay node in addition to the statistical information, and to specify a data discard point and a discard cause.

  The third object of the present invention is to select the statistical information and alarm information to be acquired according to the type and location of the access device, thereby reducing the amount of traffic collected from the access device and the load on the edge node collecting information. For the purpose of mitigation.

  The fourth object of the present invention is to reduce the load on the entire network by controlling the uplink transmission band of the access device that accommodates the user terminal that causes the discarding when the discarding occurrence point is specified.

  In order to achieve the first object, an edge node connected to an access network and a relay network, and an access device that accommodates a user terminal, comprising: an edge node that connects the access network and the relay network, the access device Measures the statistical information including the traffic volume in the access device, notifies the measured statistical information to the edge node, and the edge node has means for collecting the statistical information notified by the access device .

  In order to achieve the second object, the access device further detects at least one of a device alarm and a communication alarm in the access device, and at least one of the detected device alarm and a communication alarm. The edge node has means for collecting at least one of a device alarm and a communication alarm notified by the access device.

  In order to achieve the third object, the edge node transmits a control frame indicating at least one of statistical information to be acquired and alarm information to be acquired to the access device, and the access device has received the control frame. , Only the one specified in the control frame is collected from at least one of the statistical information and the alarm information, and the access device is designated at least one of the statistical information and the alarm information. Means for periodically transmitting data to the edge node, wherein the edge node collects at least one of statistical information and alarm information acquired from the access device and holds data in units of access devices Have

  To achieve the fourth object, the edge node compares the statistical information acquired from the access device and the statistical information for each access device flowing into the edge node for each access device, and the access device enters the access network. The amount of data transmitted is compared with the amount of data for each access device received at the edge node. If the amount of data received at the edge node is less than the amount of data transmitted by the access device to the access network, the access The edge node transmits control data for suppressing the amount of data transmitted from the apparatus to the access network, thereby reducing a load on the access network.

  According to the present invention, at least one of statistical information and alarm information measured by the access device can be collected by the edge node.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an example of a carrier access network configuration according to the first embodiment of this invention.

  The carrier access network according to the first embodiment of the present invention includes a user site 30, an access network 40, and a relay network 50. The user site 30 and the access network 40 are connected via the access device 10. The access network 40 and the relay network 50 are connected via the carrier edge node 20.

  The access network 40 is a network that connects the user site 30 and the relay network 50. Specifically, it is FTTH, ADSL, CATV, or the like. The relay network 50 is connected to another network (not shown).

  The access device 10 is connected to the user site 30 and the access network 40. In the first embodiment of the present invention, the amount of data transmitted from the user site 30 to the access network 40, statistical information including the amount of data transmitted from the access network 40, device failure information detected by the own device, and communication Collect alarm information such as alarm information. The configuration of the access device 10 will be described later with reference to FIG.

  The carrier edge node 20 is connected to the access network 40 and the relay network 50. The carrier edge node 20 according to the first exemplary embodiment of the present invention can measure the amount of data transmitted to and received from the relay network 50. Further, the statistical information and alarm information collected by the access device 10 are acquired, and the amount of data discarded by comparing the data amount measured by the carrier edge node 20 with the data amount collected from the access device 10. Can be calculated. The configuration of the carrier edge node 20 will be described later with reference to FIG.

  As a means for collecting statistical information and alarm information from the access device 10, for example, the Ethernet OAM function of the international recommendation “Y.1731” standardized by ITU-T can be used.

  Since Ethernet (registered trademark, the same applies hereinafter) has been standardized as a LAN technology, it has insufficient functions for use in a wide area network. More specifically, Ethernet maintenance and management functions such as checking the state of a remote LAN switch and isolating a line failure on the way were insufficient. Therefore, the Ethernet maintenance management function has been standardized as “Y.1731” described above.

  In Ether OAM, a connection confirmation function (CC: Continuity Check) is defined as a function for confirming connectivity between arbitrary points. The CC function is a function for confirming the normality of the communication path by periodically sending and receiving the CC frame 60 by the end-to-end communication device in the connection confirmation section. It is also possible to mount statistical information and alarm information collected by the access device 10 inside the CC frame 60 and transmit it to the carrier edge node 20. Details of the CC frame will be described later with reference to FIGS. When the CC frame is not used, statistical information and alarm information may be notified from the access device 10 to the carrier edge node 20 using a VSM frame similarly defined by Ethernet OAM. The VSM frame is Y.V. In 1731, the frame is permitted by the device providing vendor to freely define the payload and the like.

  FIG. 3 is a diagram illustrating an example of the configuration of the access network 40 according to the first embodiment of this invention.

  The access network 40 includes a plurality of switches (SW) 41. The SW 41 analyzes the received frame and transmits it to the designated destination.

  In the network according to the first embodiment of the present invention, the provider (NW provider carrier A) that provides the access network 40 and the provider (NW provider carrier B) that provides the relay network 50 are different. Further, even when the service provider providing the access network 40 and the relay network 50 is the same, the case where the service is provided in another department can be considered in the same manner.

  In addition, in the network according to the first embodiment of the present invention, when a leased line service with a guaranteed bandwidth is provided, a contract for a guaranteed bandwidth is made with the user. At this time, if the guaranteed bandwidth cannot be secured, there is a possibility that a penalty such as payment of a penalty may be imposed as a breach of contract.

  As a factor that a guaranteed bandwidth is not secured, data transferred due to buffer overflow due to data congestion in the network path may be discarded, or data may be discarded due to a device failure. However, when the provider that provides the access network 40 is different from the provider that provides the relay network 50, it is necessary to accurately identify the point at which the data is discarded in order to clarify the responsibility. is there.

  Referring to FIG. 3, there are three points where data may be discarded.

  First, as a first point, a case where data is discarded inside the access device 10 can be considered. As a factor of discarding data at the first point, for example, when the amount of data exceeding the contracted bandwidth is transmitted by the user, or a failure of the access device 10 can be considered. When the amount of data exceeding the contracted bandwidth is transmitted by the user, the responsibility lies with the user himself / herself. On the other hand, if the data is discarded due to the failure of the access device 10, it is the responsibility of the operator who provided the access device 10.

  Next, as a second point, a case where data is discarded in the access network 40 can be considered. As a factor that causes data to be discarded in the access network 40, as shown in FIG. 3, it is conceivable that congestion occurs due to traffic concentration on a specific SW 41. In this case, it is the responsibility of the provider providing the access network.

  Finally, as a third point, a case where data is discarded in the relay network 50 can be considered. When data is discarded in the relay network 50, it is the responsibility of the operator who provides the relay network.

  In order to specify the discarding of data generated at the above three points, the access device 10 inputs the data amount input from the user terminal 11 to the access device 10, the output data amount, and the access device 10 inputs to the access network 40. The collected data amount, the output data amount, and the alarm information detected by the access device 10 need to be collected. The carrier edge node 20 needs to measure the amount of data input from the access network, the amount of data output, the amount of data output to the relay network, and the amount of input data.

  Furthermore, when accommodating a plurality of user terminals, it is necessary to measure the amount of data in units of user flows.

  The carrier edge node 20 collects statistical information and alarm information collected by the access device 10 and compares them with the data amount measured by the carrier edge node 20. By doing so, the carrier edge node 20 can specify any one of the access device 10, the access network 40, and the relay network 50 where the data discard has occurred.

  FIG. 4 is a block diagram illustrating a configuration of the carrier edge node 20 according to the first embodiment of this invention.

  The carrier edge node 20 includes a control unit 220, a switch unit 230, an Uplink interface 240, and an access interface (IF) 210. The carrier edge node 20 includes a plurality of access IFs 210. The control unit 220, the switch unit 230, the Uplink interface 240, and the access IF 210 are connected to each other.

  The control unit 220 sets path information to the access IF 210, the Uplink interface, and the switch unit 230, and collects statistical information from the access IF 210 and the Uplink interface. Furthermore, statistical information and alarm information collected from the access device 10 are analyzed.

  The switch unit 230 specifies the data transfer destination, and delivers the transfer data to the appropriate access IF 210 or the Uplink interface 240.

  The Uplink interface 240 is an interface connected to the relay network 50.

  The access IF 210 is an interface connected to the access network 40. The access IF 210 further has a function of collecting and storing statistical information and alarm information measured by the access device 10.

  The access IF 210 includes a reception circuit 211A, a transmission circuit 212A, a reception circuit 211B, a transmission circuit 212B, a control IF 213, a header processing unit A 214A, a header processing unit B 214B, an OAM processing unit 215, an access device statistics holding RAM 216, and a scheduler 217. The control unit 220 performs setting of each component of the access IF 210 and collection of statistical information via the control IF 213.

  The control IF 213 receives a control command from the control unit 220 and transmits the control command to each component unit. Further, according to a request from the control unit 220, setting information, acquired statistical information, and the like from each component unit are collected and transmitted to the control unit 220.

  The reception circuit 211A receives data from the access network 40. The transmission circuit 212A transmits data to the access network 40.

  The reception circuit 212B receives data from the switch unit 230. The transmission circuit 211B transmits data to the switch unit 230.

  When the header processing unit A 214A and the header processing unit B 214B receive the frame, the header processing unit A 214A and the header processing unit B 214B analyze the header part of the frame, analyze the received data type, and specify the transmission source access device 10 of the received frame. Further, it has a function of counting the number of received frames and the number of bytes for each user or each access device 10. For example, the header processing unit 214A will be described.

  The header processing unit A214A extracts the header information when receiving the frame. From the extracted header information, first, the access device 10 that has transmitted this frame is specified. Next, the frame type is analyzed, and if the received frame is an OAM frame, the frame is transferred to the OAM processing unit 215. When the received frame is a data frame, statistical information such as the number of received frames and the number of received bytes is counted for each access device 10, and the frame is transferred to the transmission circuit 211B.

  When the OAM processing unit 215 receives the OAM frame from the header processing unit A, the OAM processing unit 215 analyzes the type of the OAM frame and performs OAM termination processing for each type. Further, it has a function of inserting an OAM frame from the carrier edge node 20 into the access device 10.

  When receiving the OAM frame from the header processing unit A 214A, the OAM processing unit 215 analyzes the OAM type. When the OAM frame delivered from the header processing unit A 214A is the CC frame 60, the OAM processing unit 215 performs processing for confirming connectivity.

  Furthermore, in the first embodiment of the present invention, when the CC frame 60 includes statistical information (CC payload information) measured by the access device 10, the statistical information is acquired from the frame, Statistical information and alarm information are stored in the access device statistics holding RAM 216.

  When statistical information and alarm information are collected from the access device 10 using the VSM frame instead of the CC frame 60, when the VSM frame is received from the header processing unit A 214A, the statistical information and alarm information are acquired from the payload. Statistical information and alarm information are stored in the access device statistics holding RAM 216 for each access device 10.

  In addition, the OAM processing unit has a function of periodically transmitting the CC frame 60 to the access device 10 and transmitting a VSM frame 70 for notifying the access 10 of the start of statistics acquisition and the alarm detection start instruction. Yes.

  The access device statistics holding RAM 216 stores statistical information and alarm information measured by the access device 10.

  FIG. 5 is a diagram illustrating an example of the access device statistics holding RAM 216 according to the first embodiment of this invention.

  The access device statistics holding RAM 216 is a RAM for storing access device statistics / alarm information for each address. The byte width of this RAM is described as 32 bytes as an example, but this byte width differs depending on the implementation of the apparatus and is not limited to this.

  The memory address of the access device statistics holding RAM may correspond to, for example, an identifier (identification ID) for identifying the access device. The access device identification ID is an ID to be used in the device for specifying the MAC address of the transmission source access device or the VID of the VLAN tag.

  When the OAM processing unit 215 acquires the statistical information and alarm information acquired by the access device 10 from the CC frame or the VSM frame, the OAM processing unit 215 applies the RAM address that matches the access device identification ID that identifies the transmission source access device 10 of the OAM frame. Write acquisition information.

  Statistical information and alarm information written in the access device statistics holding RAM 216 are different for each access device 10.

  A network administrator can periodically acquire statistical information and alarm information for each Ethernet OAM device from the access device statistics holding RAM 216 of each access IF 210 via the control unit 220.

  The scheduler 217 controls the order in which data to be transmitted to the access network 40 is delivered to the transmission circuit 212A.

  FIG. 8 is a block diagram illustrating a configuration of the access device 10 according to the first embodiment of this invention.

  The access device 10 includes a reception circuit 101, a transmission circuit 102, a port multiplexing unit 103, a header processing unit A104, a bandwidth control unit 105, a scheduler 106, a port distribution unit 107, a port multiplexing unit 108, a header processing unit B109, and an OAM processing unit 110. , A statistics / alarm table 111, a port distribution unit 112, a CPU 120, a reception circuit 121, and a transmission circuit 122.

  The reception circuit 101 and the transmission circuit 102 are connected to the user terminal 11 of the user site 30. The transmission / reception side port facing the user site 30 is defined as UNI (User Network Interface). The access device shown in FIG. 8 includes two UNIs, but may be one, or three or more.

  The receiving circuit 101 receives data transmitted from the user terminal 11. The transmission circuit 102 transmits data received from the access network 40 to the user terminal 11.

  The port multiplexing unit 103 multiplexes frames received from the plurality of receiving circuits 101. The header processing unit 104 acquires the header information of the received frame and executes a process based on the header information. The bandwidth control unit 105 controls the bandwidth as necessary, such as when a service with a guaranteed bandwidth is provided.

  The scheduler 106 performs an arbitration process for reading a frame from either the bandwidth control unit 105 or the OAM processing unit 110.

  The port distribution unit 107 distributes the frame received from the scheduler to NNI # 0 or NNI # 1. For example, the destination information of the frame header may be used for the frame distribution.

  The receiving circuit 121 receives data transmitted from the access network 40. The transmission circuit 122 transmits data received from the user site 30 to the access network 40. The reception circuit 101 and the transmission circuit 102 are used for connection to the access network 40 and constitute an NNI (Network Network Interface). The access device shown in FIG. 8 includes two NNIs, but may be one or three or more.

  The port multiplexing unit 108 multiplexes frames received from the plurality of receiving circuits 121.

  The header processing unit 109 analyzes the received frame and identifies the flow. Further, it is determined whether the received frame is user data or an OAM frame. If the received frame is user data, the frame byte length and the number of received frames are counted up as necessary to obtain statistical information. After obtaining the statistics, the user data is transferred to the port distribution unit 112.

  When the received frame is an OAM frame such as the CC frame 60 or the VSM frame 70, the OAM frame is transferred to the OAM processing unit 110.

  The port distribution unit 112 distributes the frame received from the header processing unit to UNI # 0 or UNI # 1. For example, the destination information of the frame header may be used for the frame distribution.

  When the OAM processing unit 110 acquires the Ethernet OAM frame from the header processing unit B109, the OAM processing unit 110 performs termination processing on the Ethernet OAM frame. For example, when the received Ether OAM frame is a CC frame or a VSM frame, a collection information code for instructing collection of specific statistical information or monitoring of alarm information is acquired from the frame payload and notified to the CPU 120.

  In addition, the OAM processing unit 110 generates a CC frame or a VSM frame and delivers the frame to the scheduler 106.

  The CPU 120 sets setting information necessary for each component to operate, performs detection of alarm information, management of statistical information, and the like. Further, when the collected information code is acquired from the OAM processing unit 110, the collected information code is analyzed, and the function block is instructed to start collection of designated statistical information and monitor alarm information.

  In the first embodiment of the present invention, statistics information collection and alarm information monitoring notification from the carrier edge node 20 to the access device 10 and the statistics information and alarm information are notified from the access device 10 to the carrier edge node 20 An example of the operation to be performed will be described with reference to FIGS. 2, 6, 7, 10, 18, and 19.

  FIG. 19 shows an instruction to start statistics collection and alarm monitoring from the carrier edge node 20 to the access device 10 according to the first embodiment of this invention, and the access device 10 receiving the instruction gives statistical information and an alarm to the carrier edge node 20. It is a sequence diagram which transmits information regularly.

  The carrier edge node 20 notifies the access device 10 of a collection information command 311 when it is desired to start the collection of statistical information and alarm information for the access device 10 anew.

  Specific contents of statistical information instructing collection by the collection information command 311 and alarm monitoring include, for example, “statistics of the number of input frames of the UNI port”, “statistics of the number of output frames of the NNI port”, “accommodating user unit” "Number of input frames", "monitoring hardware failure alarm", "monitoring the result of connectivity check with the opposite access device", etc.

  The collection information command 311 may be stored in the CC frame 60 or VSM frame periodically transmitted from the carrier edge node 20 and notified from the carrier edge node 20 to the access device 10. The CC frame and VSM frame for storing the collection information command 311 will be described later with reference to FIGS.

  When acquiring the collection information command 311, the access device 10 starts the statistical information and alarm monitoring specified by the collection information command 311.

  The access device 10 periodically notifies the carrier edge node 20 of the instructed statistical information and alarm information 301-n (n: 1, 2, 3,...). The statistical information and alarm information 301-n notified by the access device 10 may be stored in the CC frame 60 or VSM frame periodically transmitted from the access device 10 and notified from the access device 10 to the carrier edge node 20. good. The CC frame and VSM frame for storing the statistical information and alarm information 301-n will be described later with reference to FIGS.

  When the statistical information and alarm information collected from the access device 10 are to be changed, the carrier edge node 20 notifies the collection information code 312. When receiving the new collection information code 312, the access device 10 changes the statistical information and alarm information 302-n to be collected, and periodically notifies the carrier edge node 20.

  The CC frame and VSM frame storing the collection information command 311 will be described with reference to FIGS.

  The format of the CC frame when the information collection command 311 is stored in the CC frame will be described with reference to FIGS.

  FIG. It is a figure which shows the format of 1731 CC frame 60. FIG. Y. The CC frame 60 defined by 1731 is composed of a recommendation defining field 61 and an MEG ID 62.

  The recommendation defining field 61 stores information defined in “Y.1731”. The recommendation defining field 61 is arranged at the beginning and the end of the frame. The size of the recommendation defining field 61 arranged at the head of the frame is 8 bytes. It is recognized that it is a CC frame by the recommendation specification field 61 arranged at the head of the frame. Also, the size of the recommendation defining field 61 arranged at the end of the frame is 17 bytes.

  Y. The MEG ID 62 standardized in 1731 is an identifier for identifying the management target attribute of the Ethernet OAM. According to the standard, a 48-byte field is prepared. Of these, the upper 16 bytes are determined to be used as the ITU carrier code, but the lower 32 bytes are “Unused” in the standard.

  Therefore, in an example in which statistical information and alarm information are collected from the access device 10 using the CC, the lower 32 bytes of the MEG ID 62 are used.

  FIG. 6 is a diagram illustrating a configuration example of the CC frame 60 for notifying the collection information command from the carrier edge node 20 to the access device 10 according to the first embodiment of this invention.

  As shown in FIG. 2, the format of the CC frame 60 includes a recommendation defining field 61 and an MEG ID 62.

  In the MEG ID 62, only a 16-byte ITU carrier code 63 for identifying a network operator is defined. The remaining 32-byte field of MEG ID 62 is an unused area. Therefore, in the first embodiment of the present invention, an unused 32-byte area is used as a collection information code storage area 64 for designating alarm / statistic information collected by the access device. The collected information code storage area 32 bytes may be constituted by a collected information change flag 65 and a collected information code 66, for example.

  The collection information change flag 65 stores a value of “1” or “0”, “1” represents the start of collection of new statistical information and alarm information, and “0” represents the continuous collection of the previous instruction content.

  The collection information change flag 65 is changed from 0 to 1 when the contents of statistical information and alarm information collected by the access device 10 are changed.

  The collection information code 66 is a field used for notifying statistical information and alarm information to be acquired by the access device 10. In this field, for example, a code representing an acquired statistical information type, a device alarm to be monitored, and a code representing a communication alarm to be monitored are stored.

  FIG. 12A is a flowchart illustrating a processing procedure performed by the OAM processing unit 110 when the access device 10 according to the first embodiment of this invention receives the CC frame 60 in which the collection information code 311 is stored.

  When receiving the OAM frame, the OAM processing unit 110 of the access device 10 determines whether the received OAM frame is the CC frame 60 (S1201). If the received frame is not the CC frame 60 (the result of S1201 is “N”), this process is terminated.

  When the received frame is the CC frame 60 (result of S1201 is “Y”), the OAM processing unit 110 of the access device 10 has the value of the collection information change flag 65 included in the CC frame 60 set to “1”. It is determined whether or not there is (S1202). If the value of the collection information change flag 65 is not “1”, that is, if the value of the collection information change flag 65 is “0” (the result of S1202 is “N”), this processing is terminated and the previous instruction Continue to collect information

  When the value of the collection information change flag 65 is “1” (the result of S1202 is “Y”), the OAM processing unit 110 of the access device 10 acquires the collection information code from the CC frame 60. Referring to FIG. 6, a collection information change flag 65 is stored in the 25th byte of the CC frame 60, and a collection information code 66 is stored in 31 bytes of data from the 26th byte.

  The OAM processing unit 110 of the access device 10 notifies the CPU 120 of the acquired collection information code 66. The CPU 120 analyzes the collected information code 66 and starts acquiring specified statistical information and alarm information (S1203).

  FIG. 7 is a diagram illustrating the format of the VSM frame when the information collection command 311 is stored in the VSM frame according to the first embodiment of this invention. The VSM frame 70 may be used for notifying the access device 10 of the collection information command from the carrier edge node 20 according to the first embodiment of this invention.

  The VSM frame 70 includes a recommendation defining field 71, a SubOpCode 72, and a collection information code 73.

  The recommendation defining field 71 stores information indicating that it is a VSM frame. The size of the recommendation defining field 71 is 8 bytes. The SubOpCode 72 is an arbitrary code indicating that the VSM frame is a collected information command for requesting statistical information and alarm information. In the first embodiment of the present invention, the size of the SubOpCode 72 is 1 byte. The collection information code 73 is the same as the collection information code 66 included in the CC frame 60.

  FIG. 12B is a flowchart illustrating a processing procedure performed by the OAM processing unit 110 when the access device 10 according to the first embodiment of this invention receives the VSM frame 70.

  When receiving the OAM frame, the OAM processing unit 110 of the access device 10 determines whether the received OAM frame is the VSM frame 70 (S1211). If the received frame is not the VSM frame 70 (the result of S1211 is “N”), this process ends.

  When the received frame is the VSM frame 70 (result of S1211 is “Y”), the OAM processing unit 110 of the access device 10 determines whether or not the SubOpCode 72 included in the VSM frame 70 is a statistics / collection request. Determination is made (S1212). If the SubOpCode 72 is not a statistic / collection request (the result of S1212 is “N”), this process is terminated, and the collection of the previously instructed information is continued.

  The OAM processing unit 110 of the access device 10 acquires the collection information code from the VSM frame 70 when the SubOpCode 72 is a statistics / collection request (the result of S1212 is “Y”). Referring to FIG. 7, the collection information code 73 is stored from the 10th byte of the VSM frame 70.

  The OAM processing unit 110 of the access device 10 notifies the CPU 120 of the acquired collection information code 66. The CPU 120 analyzes the collected information code 66 and starts acquiring specified statistical information and alarm information (S1213).

  FIG. 9 is a diagram illustrating a configuration of the statistics / alarm table 111 stored in the access device 10 according to the first embodiment of this invention.

  The statistics / alarm table 111 stores statistical information and alarm information to be transmitted to the carrier edge node 20.

  As described above, each functional block starts collecting statistical information and alarm information according to an instruction from the CPU 120. The CPU 120 collects statistical information and alarm information at regular intervals from each functional block and stores them in the statistics / alarm table 111. The statistical information includes, for example, the number of bytes transmitted / received for each port / number of frames, the number of transmitted / received bytes / account for each user, and the like.

  The alarm information includes a device alarm and a communication alarm. The device alarm includes information indicating whether or not a device failure of the access device 10 has occurred. The communication alarm includes information indicating a state when the access device 10 confirms connection with a communication device other than the carrier edge node 20, information on a UNI port link failure, and the like.

  In the first embodiment of the present invention, in addition to the statistical information, the carrier edge node 20 can acquire alarm information for each access device 10 as described above.

  Each functional block collects only the statistics / alarm information specified from the carrier edge node 20. For this reason, the RAM capacity required for the statistics / alarm table 111 is only required to store the statistical information required by the carrier edge node. Compared with the conventional communication apparatus that collects all the statistical information, The effect of reducing the RAM capacity can be expected.

  Next, means for notifying statistical information and alarm information from the access device 10 to the carrier edge node 20 will be described.

  FIG. 10 shows the CC frame 60 after the information requested from the carrier edge node 20 is stored in the OAM processing unit 110 of the access device 10.

  In the first embodiment of the present invention, a 32-byte area following the 16-byte area secured by the ITU carrier code in the MEG ID storage field is used as the statistics / alarm information storage area. In this area, statistical information and alarm information held in the statistics / alarm table 111 of the access device 10 are stored.

  FIG. 11A shows a processing procedure when the OAM processing unit 215 of the carrier edge node 20 according to the first embodiment of this invention receives a CC frame 60 including statistical information and alarm information 301-n and 302-n. It is a flowchart.

  The OAM processing unit 215 of the carrier edge node 20 first determines whether or not the received OAM frame is the CC frame 60 (S1101). If the received OAM frame is not the CC frame 60 (the result of S1101 is “N”), this process is terminated, and a normal OAM frame reception process is performed.

  When the received frame is the CC frame 60 (result of S1101 is “Y”), the OAM processing unit 215 of the carrier edge node 20 acquires a flow identification ID from the received frame (S1102). The flow identification ID corresponds to the access device 10 that has transmitted the frame, and can be used as an identifier of the access device 10. The flow identification ID is, for example, MAC SA.

  Further, the OAM processing unit 215 of the carrier edge node 20 acquires statistical / alarm information from the payload of the received CC frame (S1103). That is, a 32-byte statistics / alarm storage area stored after the recommendation defining field (8 bytes) and the ITU carrier code (16 bytes) stored at the head is acquired.

  The OAM processing unit 215 of the carrier edge node 20 writes the acquired 32-byte information in the access device statistics holding RAM based on the flow identification ID acquired in the processing of S1102 (S1104). As shown in FIG. 5, the address of the access device statistics holding RAM corresponds to the identification ID of the access device and can be acquired from the flow identification ID.

  The CC frame 60 is periodically transmitted from the access device 20 to the carrier edge device 10 for connectivity confirmation. Therefore, even if statistical information and alarm information are notified regularly, there is an effect that the communication bandwidth of the access network is not consumed.

  FIG. 18 is a diagram illustrating the VSM frame 70 after the information requested from the carrier edge node 20 is stored in the OAM processing unit 110 of the access device 10 according to the first embodiment of this invention.

  In the first embodiment of the present invention, a code that defines that statistical information and alarm information 301-n and 302-n are stored in the payload is stored in the SubOpcode.

  A variable-length area following SubOpcode is used as a statistics / alarm information storage area. In this area, statistical information and alarm information held in the statistics / alarm table 111 of the access device 10 are stored.

  FIG. 11B shows a processing procedure when the OAM processing unit 215 of the carrier edge node 20 according to the first embodiment of this invention receives the VSM frame 70 including statistical information and alarm information 301-n and 302-n. It is a flowchart.

  The OAM processing unit 215 of the carrier edge node 20 first determines whether or not the received OAM frame is the VSM frame 70 (S1111). If the received OAM frame is not the VSM frame 70 (the result of S1111 is “N”), this process is terminated, and a normal OAM frame reception process is performed.

  When the received frame is the VSM frame 70 (result of S1111 is “Y”), the OAM processing unit 215 of the carrier edge node 20 acquires the SubOpcode from the received frame, and determines whether the SubOpcode is the statistical information notification frame. It is confirmed whether or not (S1112). If the SubOpcode is not a statistical information notification frame (the result of S1112 is “N”), this process ends, and a normal OAM frame reception process is performed.

  When the received frame is the VSM frame 70 (result of S1112 is “Y”), the OAM processing unit 215 of the carrier edge node 20 acquires a flow identification ID from the received frame (S1113). The flow identification ID corresponds to the access device 10 that has transmitted the frame, and can be used as an identifier of the access device 10. The flow identification ID is, for example, MAC SA.

  Further, the OAM processing unit 215 of the carrier edge node 20 acquires statistical / alarm information from the payload of the received VSM frame (S1114). That is, a 32-byte statistics / alarm storage area stored after the recommendation defining field (8 bytes) and the ITU carrier code (16 bytes) stored at the head is acquired.

  The OAM processing unit 215 of the carrier edge node 20 writes the acquired 32-byte information in the access device statistics holding RAM based on the flow identification ID acquired in S1102 (S1115). As shown in FIG. 5, the address of the access device statistics holding RAM corresponds to the identification ID of the access device and can be acquired from the flow identification ID.

  Since the payload length of the VSM frame 70 is variable, the payload can be increased according to the amount of statistical information and alarm information that need to be notified, and a large amount of information can be notified from the access device 10 to the carrier edge node 20 at a time. It becomes possible.

  According to the first embodiment of the present invention, the statistical information including the amount of data transferred via the access device 10 is measured and transmitted to the carrier edge node 20, whereby the data is discarded in the network. Can be revealed.

  Specifically, when the amount of data received by the access device 10 from the user site 30 is larger than the amount of data transmitted to the access network 40, it can be seen that the data is discarded inside the access network 40. Further, when the amount of data transmitted to the access network 40 by the access device 10 is larger than the amount of data received from the access network 40 by the carrier edge node 20, the data is discarded inside the access network 40. I understand that.

  In addition, failure alarms and communication alarms generated in the access device 10 can be monitored and transmitted to the carrier edge node. Conventionally, it becomes possible to collect alarm information from the carrier edge node 20 until the maintenance person goes to the place where the access device 10 is installed, and to identify what causes the data to be discarded Can do.

  Therefore, in the leased line service that guarantees the bandwidth, when the guaranteed bandwidth cannot be secured due to the discard of the transferred data, it is possible to identify the cause and clarify the location of responsibility.

  Although the access device 10 can collect all the statistical information and alarm information that can be assumed, the access device 10 has a larger number than the carrier edge node 20 and may be provided at a low price. desirable. Therefore, in the first embodiment of the present invention, the access device 10 does not always collect / hold all the statistical information / alarm information, but collects / maintains only the statistical information / alarm information specified by the carrier edge node 20. Hold. For this reason, a reduction in hardware memory capacity and logical scale is expected, leading to lower prices.

(Second Embodiment)
In the first embodiment of the present invention, a service with a guaranteed bandwidth such as a leased line service is targeted. However, in the second embodiment of the present invention, the present invention is applied to a so-called best effort type Internet service. .

  In the best effort type Internet service, a bandwidth is not secured for each user. Therefore, when a certain user occupies the bandwidth by using P2P software or the like, the network is congested and the bandwidth used by other users. May be difficult to secure.

  Therefore, in the second embodiment of the present invention, as shown in the following (1) and (2), network congestion is alleviated by controlling the bandwidth based on the collected statistical information.

  (1) From the difference between the NNI transmission statistics of the access device 10 and the reception statistics of the carrier edge node 20, the number of uplink data discard frames in the access network 40 can be grasped for each user. In addition, an accurate bandwidth can be grasped by monitoring the traffic volume. Based on the grasped information, it is possible to identify a user who has a large amount of data transmission and causes network congestion. Further, by using the CC frame 60 or the VSM frame 70 transmitted to the access device 10 to reduce the set bandwidth of the uplink bandwidth control unit of the access device 10, it becomes possible to reduce network congestion.

  (2) The number of downlink data discard frames in the access network 40 can be acquired for each user from the difference between the NNI reception statistics of the access device 10 and the transmission statistics of the carrier edge node 20. From the acquired number of downlink data discard frames, it is possible to identify a user who has a large amount of data transmission and causes network congestion. Next, it is possible to reduce network congestion by lowering the set bandwidth of the congestion-causing user in the downlink traffic control block of the carrier edge node 20.

  When the network state is improved, the bandwidth limitation set in (1) and (2) is released. Whether or not the state of the network has been improved can be determined by referring to the statistical information.

  Note that in the second embodiment of the present invention, description of the contents common to the first embodiment of the present invention is omitted as appropriate.

  FIG. 13 is a block diagram illustrating a configuration of the carrier edge node 20 according to the second embodiment of this invention.

  The carrier edge node 20 of the second embodiment of the present invention includes a traffic amount monitoring unit 218 and a traffic control unit 219 in addition to the configuration of the carrier edge node 20 of the first embodiment of the present invention shown in FIG. Is provided.

  The traffic amount monitoring unit 218 monitors the amount of data (traffic amount) transmitted from the access network 40, and notifies the OAM processing unit 215 when the traffic amount exceeds a predetermined threshold.

  The OAM processing unit 215 confirms from the traffic amount monitoring unit 218 that the traffic amount exceeds the threshold value and that the discard of the frame has occurred in the access network based on the uplink statistical information of the traffic excess user. A bandwidth update command is notified using a CC frame or VSM frame transmitted to the access device 10 so that the set bandwidth of the access device 10 is lowered.

  The traffic control unit 219 controls the amount of data transmitted to the access network 40 by controlling the bandwidth.

  FIG. 14 is a block diagram illustrating a configuration of the access device 10 according to the second embodiment of this invention.

  The access device 10 according to the second embodiment of the present invention includes a bandwidth setting unit 113 in addition to the configuration of the access device 10 according to the first embodiment of the present invention illustrated in FIG.

  When the CC frame 60 or the VSM frame 70 transmitted from the carrier edge node 20 includes a band update command, the OAM processing unit 110 of the access device 10 notifies the band setting unit 113 to update the band. . The band update command is included in the CC frame 60 or the VSM frame 70 transmitted from the carrier edge node 20 as described above.

  The band setting unit 113 changes the set band based on the band update command notified from the carrier edge node 20.

  FIG. 15 is a flowchart illustrating a processing procedure performed by the OAM processing unit 215 of the carrier edge node 20 according to the second embodiment of this invention.

  The OAM processing unit 215 of the carrier edge node 20 first determines whether or not the received frame is the CC frame 60 (S1501). When the received frame is an OAM frame other than the CC frame 60 (the result of S150 is “N”), this process is terminated and a normal Ethernet OAM process is performed.

  When the received frame is the CC frame 60 (result of S1501 is “Y”), the OAM processing unit 215 of the carrier edge node 20 acquires a flow identification ID from the received frame (S1502).

  When the processing of S1502 is completed, the OAM processing unit 215 of the carrier edge node 20 executes the bandwidth control processing (S1503) of the access device 10 and the bandwidth control processing (S1504) of the carrier edge node 20 in parallel. Details of the bandwidth control processing (S1503) of the access device 10 will be described with reference to FIG. 16, and the bandwidth control processing (S1504) of the carrier edge node 20 will be described in detail with reference to FIG.

  FIG. 16 is a flowchart illustrating a procedure in which the carrier edge node 20 according to the second embodiment of the present invention instructs bandwidth control of the access device 10.

  This process is executed by the OAM processing unit 215 of the carrier edge node 20 and includes a process of transmitting the VSM frame 70 including an instruction to change the band to the access device 10.

  The OAM processing unit 215 of the carrier edge node 20 acquires statistical information corresponding to the data amount transmitted by the access device 10 from the received CC frame 60 (S1601).

  The OAM processing unit 215 of the carrier edge node 20 compares the statistical information corresponding to the data amount for each access device 10 received by the access IF 210 of the carrier edge node 20 with the statistical information acquired in the processing of S1601 (S1602). ).

  The OAM processing unit 215 of the carrier edge node 20 determines whether or not the difference between the statistical information acquired from the CC frame 60 and the statistical information acquired at the access IF 210 is greater than a predefined bandwidth suppression threshold. (S1603). The difference between the statistical information acquired from the CC frame 60 and the statistical information acquired by the access IF 210 is the amount of data discarded by the access network 40 when data is transmitted from the access device 10 to the carrier edge node 20. Correspond. That is, in the process of S1603, it is determined whether the discarded data amount is larger than the bandwidth suppression threshold in the access network 40.

  When the amount of data discarded in the access network 40 is larger than the band suppression threshold (the result of S1603 is “Y”), the OAM processing unit 215 of the carrier edge node 20 performs “band setting” in the SubOp Code 72 of the VSM frame 70. And the suppression band is set in the payload (S1604).

  On the other hand, when the amount of data discarded in the access network 40 is equal to or less than the bandwidth suppression threshold (the result of S1603 is “N”), the OAM processing unit 215 of the carrier edge node 20 currently performs bandwidth suppression in the access device 10. It is determined whether or not it is implemented (S1605). If band suppression is not performed in the access device 10 (the result of S1605 is “N”), this process ends.

  The OAM processing unit 215 of the carrier edge node 20 determines whether or not the difference between the statistical information acquired by the access IF 210 and the statistical information acquired from the CC frame 60 is smaller than a predetermined band suppression release threshold. Determination is made (S1606). In other words, the processing of S1606 determines whether or not the band suppression should be canceled because the amount of data discarded in the access network 40 has become sufficiently small.

  If the amount of data discarded in the access network 40 is not sufficiently small (result of S1606 is “N”), the OAM processing unit 215 of the carrier edge node 20 ends this processing.

  When the amount of data discarded in the access network 40 becomes sufficiently small (result of S1606 is “Y”), the OAM processing unit 215 of the carrier edge node 20 sets “band setting” to the SubOpCode 72 of the VSM frame 70. The release band is set in the payload (S1607).

  When the processing in S1604 or S1607 is completed, the OAM processing unit 215 of the carrier edge node 20 transmits the created VSM frame 70 to the access device 10 (S1608).

  FIG. 17 is a flowchart illustrating a procedure for performing band control of the carrier edge node 20 according to the second embodiment of this invention.

  The OAM processing unit 215 of the carrier edge node 20 acquires statistical information corresponding to the data amount received by the access device 10 from the received CC frame 60 (S1701).

  The OAM processing unit 215 of the carrier edge node 20 compares the statistical information corresponding to the data amount for each access device 10 transmitted from the access IF 210 of the carrier edge node 20 with the statistical information acquired in the process of S1601 ( S1702).

  The OAM processing unit 215 of the carrier edge node 20 determines whether or not the difference between the statistical information acquired from the CC frame 60 and the statistical information acquired at the access IF 210 is greater than a predefined bandwidth suppression threshold. (S1703). The difference between the statistical information acquired from the CC frame 60 and the statistical information acquired by the access IF 210 is the amount of data discarded by the access network 40 when data is transmitted from the carrier edge node 20 to the access device 10. Correspond. That is, in the processing of S1703, it is determined whether the discarded data amount is larger than the bandwidth suppression threshold in the access network 40.

  When the amount of data discarded in the access network 40 is larger than the band suppression threshold (the result of S1703 is “Y”), the OAM processing unit 215 of the carrier edge node 20 causes the traffic control unit 219 to set the band set for each access device. A suppression band is set in (S1704).

  On the other hand, the OAM processing unit 215 of the carrier edge node 20 currently suppresses the bandwidth by the traffic control unit 219 when the amount of data discarded in the access network 40 is equal to or less than the bandwidth suppression threshold (result of S1703 is “Y”). Is determined (S1705). If band suppression is not performed at the carrier edge node 20 (the result of S1705 is “N”), this process ends.

  The OAM processing unit 215 of the carrier edge node 20 determines whether or not the difference between the statistical information acquired by the access IF 210 and the statistical information acquired from the CC frame 60 is smaller than a predetermined band suppression release threshold. Determination is made (S1706). That is, the processing of S1706 determines whether or not the suppression of the band should be released because the amount of data discarded in the access network 40 has become sufficiently small.

  If the amount of data discarded in the access network 40 is not sufficiently small (the result of S1706 is “N”), the OAM processing unit 215 of the carrier edge node 20 ends this processing.

  When the amount of data discarded in the access network 40 becomes sufficiently small (result of S1706 is “Y”), the OAM processing unit 215 of the carrier edge node 20 sets the bandwidth set for each access device by the traffic control unit 219. A release band is set (S1707).

  According to the second embodiment of the present invention, the congestion status of the access network can be collected in real time based on the collected statistical information, and the network congestion is controlled by controlling the bandwidth based on the congestion information. Can be effectively relieved.

It is a figure which shows an example of a structure of the carrier access network of the 1st Embodiment of this invention. It is a figure which shows the format of CC frame of the 1st Embodiment of this invention. It is a figure which shows an example of a structure of the access network of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the carrier edge node of the 1st Embodiment of this invention. It is a figure which shows the structure of the access apparatus statistics holding RAM of the 1st Embodiment of this invention. It is a figure which shows an example of a structure of CC frame transmitted to the access apparatus from the carrier edge node of the 1st Embodiment of this invention. It is a figure which shows an example of a structure of the VSM frame transmitted to the access apparatus from the carrier edge node of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the access apparatus of the 1st Embodiment of this invention. It is a figure which shows the structure of the statistics / alarm table stored in the access apparatus of the 1st Embodiment of this invention. It is a figure which shows an example of a structure of CC frame transmitted to the carrier edge node from the access apparatus of the 1st Embodiment of this invention. It is a flowchart which shows the process sequence when the OAM process part of the carrier edge node of the 1st Embodiment of this invention receives CC frame. It is a flowchart which shows the process sequence when the OAM process part of the carrier edge node of the 1st Embodiment of this invention receives a VSM frame. It is a flowchart which shows the process sequence by the OAM process part when the access apparatus of the 1st Embodiment of this invention receives CC frame. It is a flowchart which shows the process sequence by the OAM process part when the access apparatus of the 1st Embodiment of this invention receives a VSM frame. It is a block diagram which shows the structure of the carrier edge node of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the access apparatus of the 2nd Embodiment of this invention. It is a flowchart which shows the process sequence by the OAM process part of the carrier edge node of the 2nd Embodiment of this invention. It is a flowchart which shows the procedure which the carrier edge node of the 2nd Embodiment of this invention instruct | indicates the bandwidth control of an access apparatus. It is a flowchart which shows the procedure which implements the band control of the carrier edge node of the 2nd Embodiment of this invention. It is a figure which shows an example of a structure of the VSM frame transmitted to the carrier edge node from the access apparatus of the 1st Embodiment of this invention. It is a figure which shows an example of the statistics / alarm collection start and the statistics / alarm collection information notification sequence between the carrier edge node and access apparatus of the 1st Embodiment of this invention.

Explanation of symbols

10 Access Device 20 Carrier Edge Node 30 User Site 40 Access Network 41 Switch (SW)
50 Relay network 60 CC frame 61 Recommended regulation field 62 MEG ID
63 ITU carrier code 64 Collected information code storage area 65 Collected information change flag 66 Collected information code 70 VSM frame 71 Recommended regulation field 72 SubOpCode
73 Collection Information Code 101 Receiving Circuit 102 Transmitting Circuit 103 Port Multiplexing Unit 104 Header Processing Unit 105 Bandwidth Control Unit 106 Scheduler 107 Port Allocation Unit 108 Port Multiplexing Unit 109 Header Processing Unit 110 OAM Processing Unit 111 Statistics / Alarm Table 112 Port Allocation Unit 113 Bandwidth setting unit 120 CPU
121 reception circuit 122 transmission circuit 210 access interface (access IF)
211A, 211B Reception circuit 212A, 212B Transmission circuit 213 Control IF
214A, 214B Header processing unit 215 OAM processing unit 216 Access device statistics holding RAM
217 Scheduler 218 Traffic volume monitoring unit 219 Traffic control unit 220 Control unit 230 Switch unit 240 Uplink interface

Claims (20)

In a network including an access network and a relay network, a network management system for collecting statistical information including the traffic volume of the network,
The network management system includes an access device that connects to the access network, and an edge node that connects the access network and the relay network,
The access device is:
Measure statistical information including the traffic volume in the access device,
Notifying the edge node of the measured statistical information,
The network management system, wherein the edge node collects statistical information notified by the access device.   The network management system according to claim 1, wherein the statistical information is notified by a connection confirmation frame for confirming a connection between the access device and the edge node. The edge node transmits a frame including an instruction to start collecting the statistical information to the access device;
The network management system according to claim 1, wherein the access device starts measuring the statistical information when receiving a frame including an instruction to start collecting the statistical information. The edge node transmits a frame specifying the type of collected statistical information to the access device,
The access device is:
When a frame specifying the type of statistical information collected is received, the statistical information specified by the frame is measured,
The network management system according to claim 1, wherein the measured statistical information is transmitted to the edge node. The edge node is
Measure traffic received from the access network,
Collecting the traffic volume transmitted from the access device to the access network from the access device;
The network management system according to claim 1, wherein a difference between the measured traffic volume and the traffic volume collected from the access device is calculated. When the calculated difference is larger than a predetermined first threshold, the edge node has a bandwidth set so that a traffic volume transmitted to the access network is smaller than a predetermined traffic volume. Notify the access device,
The network management system according to claim 5, wherein the access device limits a traffic amount transmitted from the access device to the access network based on the notified bandwidth. The edge node is
Measure the amount of traffic sent to the access network,
Collecting traffic received from the access network by the access device from the access device;
The network management system according to claim 1, wherein a difference between the measured traffic volume and the traffic volume collected from the access device is calculated.   The edge node controls the traffic volume transmitted to the access network to be smaller than a predetermined traffic volume when the calculated difference is larger than a predetermined second threshold value. The network management system according to claim 7. In a network including an access network and a relay network, an edge node included in a network management system that collects statistical information including traffic volume of the network,
The network management system includes an access device that is connected to the access network and measures statistical information including traffic.
The edge node is
Connecting the access network and the relay network;
An edge node that collects statistical information measured by the access device.   The edge node according to claim 9, wherein the statistical information is notified by a connection confirmation frame for confirming a connection between the access device and the edge node.   The edge node according to claim 9, wherein the edge node transmits a frame including an instruction to start collecting the statistical information to the access device.   The edge node according to claim 9, wherein the edge node transmits a frame designating a type of statistical information to be collected to the access device. The edge node is
Measure traffic received from the access network,
Collecting the traffic volume transmitted from the access device to the access network from the access device;
The edge node according to claim 9, wherein a difference between the measured traffic volume and the traffic volume collected from the access device is calculated.   When the calculated difference is greater than a predetermined first threshold, the edge node has a bandwidth set so that a traffic volume transmitted to the access network is smaller than a predetermined traffic volume. The edge node according to claim 13, wherein the edge node is notified to the access device. The edge node is
Measure the amount of traffic sent to the access network,
Collecting traffic received from the access network by the access device from the access device;
The edge node according to claim 9, wherein a difference between the measured traffic volume and the traffic volume collected from the access device is calculated.   The edge node controls the traffic volume transmitted to the access network to be smaller than a predetermined traffic volume when the calculated difference is larger than a predetermined second threshold value. The edge node according to claim 15. In a network including an access network and a relay network, an access device included in a network management system that collects statistical information including traffic volume of the network,
The network management system includes an edge node that connects the access network and the relay network,
The access device is:
Connected to the access network,
Measure statistical information including the traffic volume in the access device,
An access device that notifies the edge node of the measured statistical information.   The access apparatus according to claim 17, wherein the statistical information is notified by a connection confirmation frame for confirming a connection between the access apparatus and the edge node.   The access device according to claim 17, wherein the access device starts measurement of the statistical information when receiving a frame including an instruction to start collecting statistical information transmitted from the edge node. . The access device is:
When receiving a frame specifying the type of statistical information collected from the edge node, measure the statistical information specified by the frame,
The access apparatus according to claim 17, wherein the measured statistical information is transmitted to the edge node.

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