JP2014150485A - Communication device, communication system, and abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily specify a fault location.SOLUTION: A monitoring device transmits monitoring information to adjacent communication devices 11, 12. A synchronization part 20 of the communication device 11 generates first synchronization information related to timing at which frame statistical information is collected on the basis of monitoring information. A first counting part 33 monitors a port connected to the communication device 12, and collects first statistical information on a frame to be transmitted to the communication device 12 on the basis of the first synchronization information. A generation part 39 generates a statistical frame containing the first synchronization information and the first statistical information and transmits the statistical frame to the communication device 12. The detection part 35 of the communication device 12 receives the statistical frame. A second collecting part 36 monitors a port connected to the communication device 11, and collects second statistical information on a frame received from the communication device 11 on the basis of synchronization information of the second collecting part 36. A comparing part 37 compares the first statistical information and the second statistical information corresponding to the synchronization information, and an output part 38a outputs abnormality information on the basis of the compared result.

Description

  The present invention relates to a communication device, a communication system, and an abnormality detection method.

  Conventionally, a monitoring device that monitors a failure that is not detected as an error that occurs on a network to which a plurality of communication devices are connected is known (see, for example, Patent Document 1). This monitoring device transmits a monitoring frame for monitoring the state of the network between each communication device starting from a specific communication device, and specifies a fault location by searching for a communication device having no response. As monitoring frames, for example, EtherOAM (operations administration maintenance) and IP Ping are known.

JP 2012-124640 A

  The communication device has a portion where a route through which a data frame as a main signal flows and a route through which a monitoring frame transmitted or terminated between the communication devices flows are different. Therefore, there is a possibility that the monitoring frame communicates but the data frame does not communicate between the physical layer and the data link layer, or the data frame communicates but the monitoring frame does not communicate. If it becomes like this, it will become difficult to pinpoint the fault location in a communication apparatus.

  It is an object of the present invention to provide a communication device, a communication system, and an abnormality detection method that can identify a fault location.

  A communication system according to one aspect includes a first communication device and a second communication device, and a frame between the first physical port of the first communication device and the second physical port of the second communication device. In the communication system that mutually transmits the first communication device, the first communication device acquires first synchronization information that includes information about a timing at which the second communication device collects statistical information indicating the number of frames. And at least one of the first physical port and the first physical port associated with the first physical port based on the first synchronization information, the first statistical information about the frame to be transmitted to the second communication device A statistical frame which is a frame including a first collecting means collected from one side, the first statistical information collected by the first collecting means, and the first synchronization information acquired by the first synchronizing means; Communication equipment A second communication device that acquires second synchronization information including information related to a timing at which the first communication device collects statistical information indicating the number of frames. Of the logical port associated with the second physical port and the second physical port based on the second synchronization information, the second statistical information on the frame received from the first communication device Second collecting means for collecting from at least one of them, receiving means for receiving statistical frames, comparing means for comparing the first and second statistical information corresponding to the first and second synchronization information, Output means for outputting abnormality information when the first statistical information and the second statistical information do not match each other.

  In the communication system according to the present disclosure, statistical information of a transmission frame addressed to itself and synchronization information including information on timing of collecting the statistical information are received from an adjacent communication device. Thereby, the failure location can be specified by comparing the received information and the statistical information of the received frame collected by the own communication device based on the mutual synchronization information.

FIG. 10 is an explanatory diagram illustrating an example of a communication system illustrating one embodiment of the present invention. It is a block diagram which shows the example of the communication apparatus shown in FIG. It is a block diagram which shows the example of a pair of adjacent communication apparatus shown in FIG. 4 is a flowchart showing one operation procedure of the communication apparatus shown in FIG. 3. 4 is a flowchart showing the other operation procedure of the communication apparatus shown in FIG. 3. It is a flowchart which shows the operation | movement procedure of another embodiment of the communication apparatus which transmits the flame | frame which provided the sequence number. It is a flowchart which shows the operation | movement procedure of another embodiment of the communication apparatus which receives the flame | frame which provided the sequence number.

  FIG. 1 shows an example of a communication system 10 showing an embodiment of the present invention. The communication system 10 includes a plurality of communication devices 11, 12, 13, 14, 15, 16, and 17 connected by IP (Internet Protocol), a network 18 that connects the communication devices 11 to 17, and a monitoring device 19. The form of the network 18 includes, for example, any of a star type, a ring type, a mesh type, and the like. The communication devices 15, 16, and 17 include a plurality of computers (PCs). The communication devices 11, 12, 13, and 14 are arranged at the branch points of the data transmission path that connects the plurality of communication devices 15 to 17. The communication devices 11 to 14 include devices such as routers and switching hubs that control transmission paths of frames when data (hereinafter referred to as “frames”) is transmitted. The frame indicates a unit for transmitting data.

  Note that the communication devices 11 to 17 may transmit and receive packets used in IP and ATM (automated teller machine) packets instead of frames used in Ethernet (Ethernet is a registered trademark) network. In the following description, a frame and a packet are synonymously referred to as a frame.

  The monitoring device 19 is individually connected to each of the communication devices 11 to 17 through a route different from the network 18, and time information for synchronizing the time of each of the communication devices 11 to 17 is stored in each of the communication devices 11 to 17. Send regularly to. The time information includes information related to a global standard time or a Japanese standard time.

The monitoring device 19 sends monitoring information for instructing monitoring to the communication devices 11 to 17 to be monitored at the same timing. The monitoring information is sent when the administrator performs a manual operation or periodically. The monitoring information includes timing information for collecting statistical information obtained by counting the number of frames transmitted and received per unit time in adjacent communication devices (for example, 11 and 12).
Each of the communication devices 11 to 17 receives a frame transmitted from an adjacent communication device, and performs a received frame transfer process based on address information stored in the received frame.

  Note that the monitoring device 19 and the communication devices 11 to 17 may be connected wirelessly. Further, the monitoring device 19 may synchronize the times of the communication devices 11 to 17 using an NTP (Network Time Protocol) protocol or the like. In this case, the monitoring device 19 is connected to the network. In addition, the monitoring device 19 and the communication devices 11 to 17 may synchronize time using GPS (Global Positioning System).

  FIG. 2 shows an example of the communication device 11 described in FIG. Note that the communication devices 12 to 17 illustrated in FIG. 1 have the same or similar configuration as the communication device 11 illustrated in FIG.

  2, the communication device 11 includes a synchronization unit 20, a plurality of physical ports 21-1, 21-2,..., 21-n (n is a positive integer), a monitoring unit 22, a determination unit 23, and a time count. Part 26 is included. Each physical port 21-1 to 21-n is a physical interface for individually connecting adjacent communication devices 12 and 14 (see FIG. 1). The physical port 21-1 includes logical transmission ports 24-1 to 24-n (n is a positive integer) for transmitting a frame and logical reception ports 25-1 to 25-n (n is a positive integer) for receiving a frame. Integer). Note that the plurality of physical ports 21-1 to 21-n are provided in the interface card 27.

  The synchronization unit 20 is connected to the monitoring device 19 illustrated in FIG. 1 and acquires monitoring information and time information from the monitoring device 19. The synchronization unit 20 synchronizes the time of the time measuring unit 26 with the time of the monitoring device 19 based on the time information. In addition, the synchronization unit 20 receives the monitoring information and, based on the time indicated by the time counting unit 26 at that time, a start time for starting collection of statistical information about a frame to be transmitted to the adjacent communication device 12, and Information on the collection period is generated as the first synchronization information. The synchronization unit 20 is an example of a first synchronization unit.

  Note that the monitoring information of the monitoring device 19 may include information on a reservation time for starting collection of statistical information. In this case, the synchronization unit 20 may generate the first synchronization information at the time when the timing unit 26 times the reservation time. Further, the synchronization unit 20 may generate information on the time to end collection instead of the information on the collection period. Further, the synchronization unit 20 may include information on a cycle for collecting statistical information in the first synchronization information. Information regarding this cycle may be stored in advance in a storage unit included in each of the communication devices 11 to 17.

  The monitoring unit 22 includes a first collection unit 33, a generation unit 34, a detection unit 35, a second collection unit 36, a comparison unit 37, and output units 38-1, 38-2,. Positive integer). The monitoring unit 22 is also connected to each of the other physical ports 21-2 to 21-n. However, in FIG. 2, the monitoring unit 22 corresponding to the physical port 21-1 is shown in order to prevent the drawing from becoming complicated. It is shown.

  The synchronization unit 20 sends the first synchronization information to the first collection unit 33, the generation unit 34, and the second collection unit 36, respectively. The first collection unit 33 collects statistical information about frames transmitted to the adjacent communication device 12 as first statistical information. Collection by the first collection unit 33 is based on the first synchronization information, the physical port 21-1 to which the adjacent communication device 12 is connected, and the logical transmission port 24 associated with the physical port 21-1. -1 to 24-n, every 39. The first collection unit 33 sends the first statistical information to the generation unit 34. The first collection unit 33 is an example of a first collection unit.

  The generation unit 34 is connected to the logical transmission port 39. The logical transmission port 39 is allocated separately from the logical transmission ports 24-1 to 24-n associated with the physical port 21-1. The generation unit 34 generates a statistical frame that is a frame including the first synchronization information and the first statistical information. Then, the generation unit 34 transmits the generated statistical frame to the adjacent communication device 12 via the logical transmission port 39 and the physical port 21-1. The generation unit 34 is an example of a transmission unit. The first statistical information includes information such as the number of transmission bytes and the number of transmission frames to be discarded in addition to the information on the number of frames to be transmitted.

  The detection unit 35, the second collection unit 36, the comparison unit 37, the output units 38-1 to 38-n, and the determination unit 23 receive transmissions received from the adjacent communication device 12 connected to the physical port 21-1. Information indicating abnormality is output based on the statistical information of the frame.

  The synchronization unit 20 of the adjacent communication device 12 receives monitoring information from the monitoring device 19. The synchronization unit 20 receives the monitoring information, and based on the time information indicated by the time counting unit 26 at that time, the start time for starting the statistical information about the received frame and the information on the collection period are Generate as synchronization information. Then, the synchronization unit 20 sends the generated second synchronization information to the second collection unit 36 and the comparison unit 37. Note that the synchronization unit 20 of the adjacent communication device 12 is an example of a second synchronization unit.

  Note that the monitoring information of the monitoring device 19 may include information on a reservation time for starting collection of statistical information. In this case, the synchronization unit 20 of the adjacent communication device 12 may generate the second synchronization information at the time when the timer unit 26 times the reservation time. Further, the synchronization unit 20 of the adjacent communication device 12 may generate information on the time to end the collection instead of the information on the collection period. Further, the synchronization unit 20 of the adjacent communication device 12 may include information on a cycle for collecting statistical information in the second synchronization information. This period information may be stored in advance in a storage unit included in each of the communication devices 11 to 17.

  The detection unit 35 is connected to the logical reception port 40. The logical reception port 40 is assigned separately from the logical reception port 25 associated with the physical port 21-1. The detection unit 35 detects and receives a statistical frame transmitted from the adjacent communication device 11 via the logical reception port 40. Then, the detection unit 35 extracts the first synchronization information and the first statistical information from the received statistical frame, and sends the extracted first synchronization information and the first statistical information to the comparison unit 37. The detecting unit 35 of the adjacent communication device 12 is an example of a receiving unit.

  The second collection unit 36 collects second statistical information about the frames received from the communication device 11 based on the second synchronization information. Collection by the second collection unit 36 is performed for each physical port 21-1 and logical reception ports 25 and 40 associated with the physical port 21-1. The second collection unit 36 sends the second statistical information to the comparison unit 37. Note that the second collection unit 36 of the adjacent communication device 12 is an example of a second collection unit. The second statistical information includes the number of received bytes, the number of received frames to be discarded, and the like in addition to the number of frames to be received.

  The comparison unit 37 compares the first and second statistical information corresponding to the first and second synchronization information with each other, and sends information of the comparison result to the output unit 38-1. The output unit 38-1 determines whether or not there is an abnormality based on the comparison result information, and outputs the abnormality information to the determination unit 23 when it is determined as abnormal.

  The abnormality information includes two pieces of information described below. The first is statistical information collected at the physical port 21-1 of the communication device 11 in the first statistical information, and statistical information collected at the physical port 21-1 of the communication device 12 among the second statistical information. It is the information of the result of comparing. The second is the statistical information collected for each of the logical transmission ports 24-1 to 24-n, 39 of the communication device 11 in the first statistical information, and the logical reception port of the communication device 12 in the second statistical information. It is the information of the result of having compared with the statistical information collected for every 25-1 to 25-n and 40.

  The determination unit 23 determines the failure location based on the abnormality information output from the output units 38-1, 38-2,..., 38-n provided for each of the physical ports 21-1 to 21-n. . The output unit 38-1 is an example of an output unit.

  The first collection unit 33 collects data in units of either the physical ports 21-1 to 21-n of the communication device 11 or the units of the logical transmission ports 24-1 to 24-n and 39. Also good. In this case, the second collection unit 36 of the adjacent communication device 12 collects according to the unit collected by the first collection unit 33. And the judgment part 23 of the communication apparatus 12 may judge a failure location based on the result of having compared the statistical information collected by the 1st and 2nd collection parts 33 and 36 mutually.

  FIG. 3 shows an example in which, in the communication system 10 shown in FIG. 1, an object to be monitored for failure is set to a path for sending a frame from the communication device 11 to the adjacent communication device 12, for example. In FIG. 3, the monitoring device 19 sends monitoring information to, for example, the synchronization unit 20 between the communication device 11 and the adjacent communication device 12.

  FIG. 4 shows an operation procedure of the communication apparatus that collects and transmits the first statistical information. The communication device that collects and transmits the first statistical information will be described as the communication device 11 below.

  (Step S <b> 1) The synchronization unit 20 of the communication device 11 acquires monitoring information sent from the monitoring device 19. When receiving the monitoring information, the synchronization unit 20 generates first synchronization information including the start time and the collection period information based on the time information of the time measuring unit 26. Then, the synchronization unit 20 sends the generated first synchronization information to the first collection unit 33 and the generation unit 34 illustrated in FIG.

  (Step S2) The first collection unit 33 monitors the physical port 21-1 described in FIG. 3 based on the first synchronization information, and is transmitted from the logical transmission ports 24-1 to 24-n, 39. Collect the number of frames Further, the first collection unit 33 monitors the logical transmission ports 24-1 to 24-n, 39 associated with the physical port 21-1 based on the first synchronization information, and transmits the transmitted frames. Are collected for each of the logical transmission ports 24-1 to 24-n, 39. Then, the first collection unit 33 sends information on the number of frames collected to the generation unit 34 as first statistical information.

  (Step S3) The generation unit 34 generates a statistical frame that is a frame including the first synchronization information and the first statistical information, and the generated statistical frame is stored in the logical transmission port 39 described in FIG. The data is transmitted to the adjacent communication device 12 via the port 21a.

  FIG. 5 shows an operation procedure of an adjacent communication device that receives a statistical frame. As an example, the communication device 12 will be described below.

  (Step S4) Upon receiving the monitoring information acquired from the monitoring device 19 shown in FIG. 3, the synchronization unit 20 of the adjacent communication device 12 obtains the second synchronization information based on the time information indicated by the time measuring unit 26. create. The second synchronization information includes information about a start time for starting collection of the number of frames received from the communication device 11 and a collection period. The timers 26 of the communication devices 11 and 12 are synchronized in time by the time information transmitted from the monitoring device 19. The synchronization unit 20 of the adjacent communication device 12 sends the second synchronization information to the second collection unit 36 and the comparison unit 37.

  (Step S5) The second collection unit 36 monitors the physical port 21-1 and the logical reception ports 25 and 40 associated with the physical port 21-1 based on the second synchronization information, The number of frames received from the communication device 11 is collected. Then, the second collection unit 36 sends the collected number of received frames to the comparison unit 37 as second statistical information.

  (Step S6) The detection unit 35 of the adjacent communication device 12 detects the statistical frame sent from the communication device 11 via the physical port 21-1 shown in FIG. Receive through the receiving port 40.

(Step S7) The detection unit 35 extracts the first synchronization information and the first statistical information from the received statistical frame. Then, the detection unit 35 associates the first synchronization information with the first statistical information, and sends the first statistical information associated with the first synchronization information to the comparison unit 37.
(Step S <b> 8) The comparison unit 37 compares the first and second statistical information corresponding to the first and second synchronization information with each other, and sends the comparison result information to the output unit 38-1.

  (Step S <b> 9) The output unit 38-1 outputs “no abnormality” information when the compared results match, and outputs information about the content of the abnormality when they do not match. The information on the content of the abnormality matches the statistical information collected on the physical ports 21-1 to 21-n of the communication device 11 with the statistical information collected on the physical ports 21-1 to 21-n of the communication device 12. Contains information on ports that are not used. The information on the content of the abnormality includes statistical information collected for each of the logical transmission ports 24-1 to 24-n and 39 of the communication device 11 and each logical reception port 25-1 to 25-n and 40 of the communication device 12. And the statistical information collected for each port and the information on the ports that do not match are obtained.

  Note that the output unit 38-1 may have an allowable range for the degree of matching (degree of matching) because there is an error in the collection of the number of frames between the transmitting side and the receiving side. For example, the output unit 38-1 indicates that the ratio of the first statistical information and the second statistical information is about 60 to 70%, preferably about 80% of the completely matched ratio, and “no abnormality” May be determined.

  (Step S <b> 10) The output units 38-2 to 38-n are comparison units that are monitored by a monitoring unit that monitors physical ports to which adjacent communication devices 13 and 15 to 17 (see FIG. 1) other than the communication device 11 are connected. From the information of the result of comparing the first and second statistical information with each other.

  (Step S11) The determination unit 23 of the adjacent communication device 12 determines “no abnormality” from the output units 38-1 to 38-n provided in the plurality of physical ports 21-1 to 21-n described in FIG. Receives information or information on the contents of abnormalities. The determination unit 23 of the communication device 12 identifies a failure location based on “no abnormality” information obtained from each of the output units 38-1 to 38-n or information on the content of the abnormality.

(Step S12) When the determination unit 23 determines that there is an abnormality in the plurality of physical ports 21-1 to 21-n based on the information on the content of the abnormality, any of the physical ports 21-1 to 21-n The interface card 27 (see FIG. 2) including
(Step S <b> 13) When the determination unit 23 determines that there is no abnormality in the plurality of physical ports 21-1 to 21-n based on the information on the content of the abnormality, whether the abnormality is in a single physical port. to decide.

(Step S14) When the determination unit 23 determines that there is an abnormality in a single physical port based on the information on the content of the abnormality, the determination unit 23 specifies that the physical port has a failure.
(Step 15) The determination unit 23 performs logical transmission ports 24-1 to 24-n, 39 of the communication device 11 and logical reception ports 25-1 to 25-n, 40 of the adjacent communication device 12 (see FIG. 3). Compare by port. If the determination unit 23 determines that there are ports that do not match, the determination unit 23 specifies that the logical transmission ports 24-1 to 24-n and 39 and the logical reception ports 25-1 to 25-n and 40 have a failure. .

The generation unit 34 embeds statistical frame information in a payload that is a data body excluding additional information such as a header and a trailer in a monitoring frame for monitoring the state of the network, and sends it as a monitoring frame. Also good. In this case, it is possible to simultaneously monitor the state of the network using the monitoring frame and the failure based on the statistical frame according to the present embodiment.
Further, when time synchronization is not guaranteed between the plurality of communication devices 11 to 17, a failure may be detected based on a frame to which a sequence number indicating the order of frames is added as synchronization information.

  FIG. 6 shows an operation procedure of another embodiment of a communication apparatus that transmits a frame to which a sequence number is assigned. 6 has the same or similar configuration as the communication apparatus 11 shown in FIG.

  (Step S <b> 16) In FIG. 6, the synchronization unit 20 of the communication device 11 acquires monitoring information including monitoring timing information from the monitoring device 19. The monitoring information includes information such as a monitoring start time (start time) and a monitoring period (monitoring period). Note that the monitoring period includes a certain period.

  (Step S17) The generation unit 34 of the communication device 11 generates a frame to which a sequence number is assigned in response to the start time information, and the generated plurality of frames are transmitted via the logical transmission port 39 and the physical port 21-1. To the adjacent communication device 12 based on the monitoring period.

  (Step S <b> 18) The first collection unit 33 monitors the logical transmission port 39 or the physical port 21-1 and collects statistical information about a frame to which a sequence number is transmitted as third statistical information. The third statistical information is sent from the first collection unit 33 to the generation unit 34.

  (Step S19) The generation unit 34 generates a statistical frame that is a frame including the third statistical information, and sends the statistical frame to the adjacent communication device 12 via the logical transmission port 39 and the physical port 21-1.

  FIG. 7 shows an operation procedure of another embodiment of a communication apparatus that receives a frame to which a sequence number is assigned. 7 has the same or similar configuration as the communication device 12 shown in FIG.

  (Step S20) In FIG. 7, the second collection unit 36 of the adjacent communication device 12 monitors the physical port 21-1 and the logical reception port 40. Then, the second collection unit 36 collects the statistical information about the frame to which the sequence number received from the communication device 11 is assigned as the fourth statistical information, and sends the collected fourth statistical information to the comparison unit 37. .

(Step S <b> 21) The detection unit 35 of the adjacent communication device 12 receives the statistical frame transmitted from the communication device 11.
(Step S <b> 22) The detection unit 35 extracts third statistical information from the received statistical frame, and sends the extracted third statistical information to the comparison unit 37.

(Step S <b> 23) Further, the detection unit 35 receives a frame to which a sequence number is assigned, extracts the sequence number, and sends information on the extracted sequence number to the comparison unit 37.
(Step S24) The comparison unit 37 compares the third and fourth statistical information with each other, and determines whether or not the third and fourth statistical information match each other.

(Step S25) When the third and fourth statistical information match each other, the comparison unit 37 determines whether or not the sequence numbers extracted from the frames are not missing.
(Step S26) When the third and fourth statistical information do not match each other, the comparison unit 37 outputs abnormality information to the output unit 38-1. Further, when the comparison unit 37 determines that the sequence number order is missing, the comparison unit 37 outputs abnormality information to the output unit 38-1.

  (Step S <b> 27) The determination unit 23 receives “no abnormality” information or abnormality content information from the plurality of output units 38-1 to 38-n described in FIG. 3. The determination unit 23 identifies the failure location based on the “no abnormality” information obtained from each of the output units 38-1 to 38-n or information on the content of the abnormality.

(Step S <b> 28) The determination unit 23 determines whether there is an abnormality in the plurality of physical ports 21-1 to 21-n based on the information on the content of the abnormality.
(Step S29) When the determination unit 23 determines that there is an abnormality in the plurality of physical ports 21-1 to 21-n, the interface card 27 including any one of the physical ports 21-1 to 21-n (see FIG. 2). ).

  (Step S30) When the determination unit 23 determines that there is no abnormality in the plurality of physical ports 21-1 to 21-n, a specific port among the physical ports 21-1 to 21-n of the communication devices 11 and 12 Is identified as a failure. Alternatively, the determination unit 23 selects a specific one of the logical ports 24-1 to 24-n, 39, 25-1 to 25-n, and 40 associated with the specific physical ports 21-1 to 21-n. Identify the port as failed.

  Note that in a large-scale communication apparatus having a large number of logical ports, if a statistical frame including all statistical information collected from a large number of logical ports is transmitted at a time, the bandwidth set in the physical port 21-1 This may affect the band through which the main signal passes. In that case, the generation unit 34 may divide the statistical frame to be transmitted so as not to affect the bandwidth of the physical port 21-1, and transmit each of the divided statistical frames while shifting the time (distributed). . According to this embodiment of the communication apparatus, it is possible to prevent the bandwidth set for the physical port from being affected.

  From the above detailed description, features and advantages of the embodiments will become apparent. This is intended to cover the features and advantages of the embodiments described above without departing from the spirit and scope of the claims. Also, any improvement and modification should be readily conceivable by those having ordinary knowledge in the art. Therefore, there is no intention to limit the scope of the inventive embodiments to those described above, and appropriate modifications and equivalents included in the scope disclosed in the embodiments can be used.

DESCRIPTION OF SYMBOLS 10 ... Communication system; 11-17 ... Communication apparatus; 18 ... Network; 20 ... Synchronizing part; 21-1-21-n ... Physical port; 24-1-24-n, 39 ... Logical transmission port; 25-n, 40 ... logical reception port; 26 ... timing unit; 33 ... first collection unit; 34 ... generation unit; 35v detection unit; 36 ... second collection unit; 37 ... comparison unit; ... Output section

Claims (5)

A first communication device and a second communication device are provided, and frames are mutually transmitted between the first physical port of the first communication device and the second physical port of the second communication device. In a communication system,
The first communication device is:
First synchronization means for acquiring first synchronization information including information on timing at which the second communication device collects statistical information indicating the number of frames;
The first statistical information about the frame to be transmitted to the second communication device is based on the first synchronization information, and the logic associated with the first physical port or the first physical port First collecting means for collecting from at least one of the ports;
Transmitting means for transmitting a statistical frame that is a frame including the first statistical information collected by the first collecting means and the first synchronization information acquired by the first synchronizing means to the second communication device; With
The second communication device is:
Second synchronization means for acquiring second synchronization information including information on timing at which the first communication device collects statistical information indicating the number of frames;
The second statistical information about the frame received from the first communication device is logically associated with the second physical port and the second physical port based on the second synchronization information. A second collection means for collecting from at least one of the ports;
Receiving means for receiving the statistical frame;
Comparing means for comparing the first and second statistical information corresponding to the first and second synchronization information with each other;
Output means for outputting information of abnormality when the first and second statistical information do not match each other;
A communication system comprising: The communication system according to claim 1,
Each of the first communication device and the second communication device includes a timing unit,
Monitoring means for sending time information for synchronizing the times of the time measuring means included in the first communication device and the second communication device to the first and second communication devices, respectively;
The first and second synchronization means receive information of the monitoring command from the monitoring means, and start to start collecting the first and second statistical information based on the time indicated by the timing means Generating information indicating time and information indicating a period for collecting the first and second statistical information;
A communication system characterized by the above. In a communication device in which adjacent communication devices are connected through a physical port, having a function of identifying a failure location based on a comparison of a pair of statistical information indicating the number of transmission frames and reception frames collected at the same timing,
Synchronization means for acquiring synchronization information including information related to timing at which the adjacent communication device collects the statistical information;
One statistical information of the pair of statistical information about the frame transmitted to the adjacent communication device is associated with the first physical port or the first physical port based on the synchronization information. Means for collecting from at least one of the logical ports;
Transmitting means for transmitting a statistical frame, which is a frame including the statistical information collected by the collecting means and the synchronization information acquired by the synchronizing means, to the adjacent communication device;
A communication apparatus comprising: A statistic that is a frame that includes first statistical information indicating the number of frames transmitted from the adjacent communication device to itself and first synchronization information that includes information about timing of collecting the first statistical information. In a communication device that receives a frame,
Second synchronization means for acquiring second synchronization information including information on timing at which the adjacent communication device collects statistical information indicating the number of frames; and
Based on the second synchronization information, the second physical port and the logical port associated with the second physical port are the second statistical information about the frame received from the adjacent communication device. A second collection means for collecting from at least one of:
Receiving means for receiving the statistical frame;
Comparing means for comparing the first and second statistical information corresponding to the first and second synchronization information with each other;
Output means for outputting information of abnormality when the first and second statistical information do not match each other;
A communication apparatus comprising: In an abnormality detection method for detecting an abnormality by monitoring statistical information indicating the number of frames transmitted between a first physical port of a first communication device and a second physical port of a second communication device ,
The first communication device is:
The first communication information including information related to the timing at which the second communication device collects the statistical information is acquired, and the frame is transmitted to the second communication device based on the acquired first synchronization information. Is collected from at least one of the first physical port or the logical port associated with the first physical port, and the collected first statistical information and the Transmitting a statistical frame which is a frame including first synchronization information to the second communication device;
The second communication device is:
The first communication device acquires second synchronization information including information related to the timing of collecting statistical information indicating the number of frames, and based on the acquired second synchronization means, from the first communication device Collecting second statistical information about a frame to be received from at least one of the second physical port and a logical port associated with the second physical port, and receiving the statistical frame Outputting an abnormality when the first and second statistical information corresponding to the first and second synchronization information do not match each other,
An abnormality detection method comprising:

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