JP2021034907A - Communication apparatus, abnormality detection method and program - Google Patents

Abstract

To provide a communication apparatus capable of performing abnormality detection while suppressing an influence upon a service in operation.SOLUTION: The present invention relates to a communication apparatus which communicates with an external device over a network, comprising: a control unit which generates a packet; a first transfer unit which transfers a sent packet using a protocol corresponding to a data link layer; and a second transfer unit which transfers the packet transferred from the first transfer unit using a protocol corresponding to a physical layer. The control unit generates a communication confirmation packet for confirming a communication on a communication channel inside of the communication apparatus. The first transfer unit includes a port which is connected to the network, and a pair of communication confirmation ports connected without interposing the network. The control unit confirms the communication of the communication channel by sending out the communication confirmation packet via one of the pair of communication confirmation ports and receiving the communication confirmation packets returned via one and the other of the pair of communication confirmation ports.SELECTED DRAWING: Figure 1

Description

The present invention relates to communication devices, anomaly detection methods and programs.

Large-scale communication devices used by telecommunications carriers and the like employ a redundant configuration in case a communication abnormality occurs due to a device failure or the like. Such a communication device needs a function of automatically switching between a working system device and a standby system device in response to detection of a communication abnormality and promptly notifying a maintenance person of the occurrence of a communication abnormality.

As a device for detecting a communication abnormality, a counter is provided to count "collision packets", which is a defect caused by the simultaneous transmission of information packets by one device that communicates and the other device, and is based on the count value of the counter. A device for detecting a communication abnormality has been proposed (for example, Patent Document 1).

Further, in a remote communication network, in order to detect a network failure in real time, a management system has been proposed in which communication for error detection is periodically performed and the response is confirmed to detect the network failure. (For example, Patent Document 2).

In addition, when the occurrence of a failure is detected, the communication device that detected the failure is used as the master device, and the opposite communication device is used as the slave device to measure the transmission / reception level and diagnose the internal line, and whether the failure source is the transmitting side or the receiving side. , A communication system for identifying a suspected portion by separating the inside of the device or the outside of the device has been proposed (for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 05-211508 JP-A-2009-135984 JP-A-2010-245589

In the method of detecting a communication abnormality using a counter as in Patent Document 1, it seems that a malfunction of the counter operation due to a failure of a communication device or a stoppage of a communication function such that the counter does not count due to an abnormal operation of a program occurs. In this case, there is a problem that an abnormality cannot be detected by monitoring with a counter.

Further, as in Patent Document 2, in the method of detecting a communication abnormality by performing communication for error detection and response confirmation (that is, communication confirmation by alive monitoring), communication to the connection destination device and connection destination A response from the device is required. However, in the communication using PING performed by alive monitoring, the execution of communication for communication confirmation may not be permitted from the viewpoint of performance deterioration due to the response processing to the PING of the connected device and the security against the reception of the PING. In such a case, there is a problem that communication abnormality cannot be detected.

In addition, as in Patent Document 3, the method of isolating the faulty part when the occurrence of a fault is detected makes it impossible to communicate for the service. Therefore, during the operation of the communication service. There was a problem that it could not be used as an abnormality detection method to be implemented.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication device capable of detecting a communication abnormality while suppressing an influence on a communication service during operation.

The communication device according to the present invention is a communication device that communicates with an external device via a network, and uses a processing control unit that generates a communication packet and the communication packet sent from the processing control unit as a data link layer. A first transfer unit that transfers the communication packet using the corresponding communication protocol, and a second transfer unit that transfers the communication packet transferred by the first transfer unit to the external device using the communication protocol corresponding to the physical layer. The processing control unit has a communication confirmation packet, which is a communication packet for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit. The first transfer unit, which is generated, relays the transfer of the communication packet sent from the processing control unit to the second transfer unit, and does not go through the normal communication port connected to the network and the network. It has a pair of communication confirmation communication ports connected to the communication control unit, and the processing control unit sends the communication confirmation packet through one of the pair of communication confirmation communication ports, and the pair of communication confirmation communication ports. It is characterized in that the communication confirmation packet returned via one and the other is received, and the communication of the communication path is confirmed based on the reception result.

Further, the abnormality detection method according to the present invention includes a processing control unit that generates a communication packet and a first transfer unit that transfers the communication packet sent from the processing control unit using a communication protocol corresponding to the data link layer. And a second transfer unit that transfers the communication packet transferred by the first transfer unit to an external device using a communication protocol corresponding to the physical layer, and communicates with the external device via a network. An abnormality detection method for detecting an abnormality in a communication path inside a communication device, for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit. A step of generating a communication confirmation packet, which is a communication packet of the above, and a pair of communication confirmations provided in the first transfer unit and connected from the processing control unit to the first transfer unit without going through the network. A step of sending the communication confirmation packet so as to pass through one of the communication confirmation ports for communication, a step of receiving the communication confirmation packet returned via one and the other of the pair of communication confirmation communication ports, and receiving. It is characterized by including a step of confirming the communication of the communication path based on the result.

Further, the program according to the present invention includes a processing control unit that generates a communication packet, a first transfer unit that transfers the communication packet sent from the processing control unit using a communication protocol corresponding to the data link layer, and a first transfer unit. A communication device having a second transfer unit that transfers the communication packet transferred by the first transfer unit to an external device using a communication protocol corresponding to the physical layer, and communicating with the external device via a network. In addition, a step of generating a communication confirmation packet, which is a communication packet for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit, and the processing control. The communication confirmation packet is transmitted from the unit toward the first transfer unit so as to pass through one of a pair of communication confirmation communication ports provided in the first transfer unit and connected without going through the network. A step of receiving the communication confirmation packet returned via one and the other of the pair of communication confirmation communication ports, and a step of confirming the communication of the communication path based on the reception result are executed. It is characterized by letting it.

According to the present invention, it is possible to detect a communication abnormality while suppressing the influence on the communication service during operation.

It is a block diagram which shows the structure of the communication apparatus which concerns on Example 1 of this invention. It is a sequence diagram which shows the processing routine of the communication confirmation processing executed by the communication apparatus of Example 1. FIG. It is a figure which shows typically the signal path of the communication confirmation packet in the communication confirmation processing of Example 1. FIG. It is a block diagram which shows the structure of the communication apparatus which concerns on Example 2 of this invention. It is a sequence diagram which shows the processing routine of the communication confirmation processing executed by the communication apparatus of Example 2. FIG. It is a figure which shows typically the signal path of the communication confirmation packet in the communication confirmation processing of Example 2. FIG.

Hereinafter, examples of the present invention will be described with reference to the drawings. In the description and the accompanying drawings in each of the following examples, substantially the same or equivalent parts are designated by the same reference numerals.

FIG. 1 is a block diagram showing a configuration of a communication device 100 of this embodiment. The communication device 100 of this embodiment is a communication device that communicates with an external device via a network in accordance with the communication standard of Ethernet (registered trademark).

The communication device 100 is composed of a CPU device 10, a MAC device 20, and a PHY device 30.

The CPU (Central Processing Unit) device 10 is an arithmetic device that executes communication processing and processing when a failure occurs. The CPU device 10 includes a service packet processing unit 11, an input / output buffer 12, a physical failure detection unit 13, a monitoring packet first processing unit 14, and a monitoring packet second processing unit 15.

The service packet processing unit 11 is a functional block formed by, for example, the CPU device 10 executing a predetermined program. The service packet processing unit 11 executes packet processing for a packet (hereinafter, referred to as a normal packet) for performing a normal communication service.

The input / output buffer 12 is a packet buffer that temporarily stores packets transmitted / received to / from the MAC device 20 when the CPU device 10 communicates.

The physical failure detection unit 13 is a functional block that detects that a failure has occurred in the MAC device 20 and the PHY device 30 (that is, a device external to the CPU device 10). The physical failure detection unit 13 detects a failure based on the notifications received from each of the MAC device 20 and the PHY device 30.

The physical failure detection unit 13 is connected to the MAC device 20 via the first communication interface C1. The first communication interface C1 is an interface for communicating a control signal from the CPU device 10 to the MAC device 20, and is connected by, for example, an MDIO (Management Data Input / Output) standard control interface and a plurality of interrupt signals. There is. For example, the setting information of the MAC device 20, the information about the count value of the packet counter (not shown) in the MAC device 20, and the information such as the presence / absence of abnormality detection in the MAC device 20 are the first communication interface C1. It is sent and received via.

Further, the physical failure detection unit 13 is connected to the PHY device 30 via the second communication interface C2. The second communication interface C2 is an interface for communicating a control signal from the CPU device 10 to the PHY device 30, and is connected by, for example, an MDIO standard control interface and a plurality of interrupt signals. For example, information such as the setting information of the PHY device 30 and the presence / absence of abnormality detection in the PHY device 30 is transmitted / received via the second communication interface C2.

The monitoring packet first processing unit 14 and the monitoring packet second processing unit 15 are functional blocks that process the communication confirmation packet used for confirming the communication of the communication path used for the normal communication service. In this embodiment, the communication confirmation packet is used to confirm the communication path inside the communication device 100, that is, the communication path between the CPU device 10 and the MAC device 20 and between the MAC device 20 and the PHY device 30. I do.

The monitoring packet first processing unit 14 generates and transmits a communication confirmation packet. The monitoring packet first processing unit 14 has an IP interface address (indicated as a normal IF 141 in FIG. 1) corresponding to a normal communication service, and transmits a communication confirmation packet using the address as a source. ..

The monitoring packet second processing unit 15 receives the communication confirmation packet. The monitoring packet second processing unit 15 has an IP interface address for receiving a communication confirmation packet (indicated as a receiving IF 151 in FIG. 1), which is different from the address of the IP interface that performs a normal communication service. There is.

The monitoring packet second processing unit 15 transmits a response indicating the reception result of the communication confirmation packet to the monitoring packet first processing unit 14. The monitoring packet first processing unit 14 confirms whether or not an abnormality has occurred in the communication path based on the response from the monitoring packet second processing unit 15.

In the communication device 100 of the present embodiment, the communication confirmation packet is transmitted from the monitoring packet first processing unit 14 to the address of the IP interface for reception of the monitoring packet second processing unit 15 as the destination address.

The MAC (Medium Access Control) device 20 is a device that transfers packets using the communication protocol of the data link layer in Ethernet (registered trademark) communication. In this embodiment, the MAC device 20 executes a transfer process of a packet (hereinafter, referred to as a normal packet) transmitted / received by a normal communication service and a communication confirmation packet. The MAC device 20 has an L2 processing unit 21, input / output buffers 22A, 22B, 22C and 22D.

The L2 processing unit 21 is a signal processing unit that performs signal processing for communication of the layer 2 (data link layer). For example, the L2 processing unit 21 converts the packet transmitted from the CPU device 20 into a logical signal corresponding to the communication of the data link layer and transmits (that is, forwards) the packet. Further, the L2 processing unit 21 performs a process of converting the logic signal transmitted from the PHY device 30 into a packet and sending it to the CPU device 10.

The input / output buffers 22A, 22B, 22C and 22D are buffers for temporarily storing logical signals transmitted and received between the MAC device 20 and the PHY device 30. The input / output buffers 22A and 22B temporarily store logic signals (that is, logic signals corresponding to normal packets) transmitted and received in a normal communication service. On the other hand, the input / output buffers 22C and 22D temporarily store the logic signals transmitted and received in the communication confirmation process (that is, the logic signals corresponding to the communication confirmation packets).

The input / output buffer 22A is connected to the communication port P1. Further, the input / output buffer 22B is connected to the communication port P2. Communication ports P1 and P2 are communication ports that relay the transmission of logical signals in a normal communication service.

The input / output buffer 22C is connected to the communication port P3. Further, the input / output buffer 22D is connected to the communication port P4. The communication ports P3 and P4 are communication ports that relay the transmission of the logical signal in the communication confirmation process. The communication port P3 is used when transmitting the logic signal transmitted from the MAC device 20 to the PHY device 30. On the other hand, the communication port P4 is used when transmitting the logic signal transmitted from the PHY device 30 to the MAC device 20.

The PHY device 30 is a device that transfers packets using the communication protocol of the physical layer in Ethernet (registered trademark) communication. In this embodiment, the PHY device 30 executes the transfer processing of the normal packet and the communication confirmation packet. The PHY device 30 has a signal processing unit 31.

The signal processing unit 31 is a signal processing unit that performs signal processing for layer 1 (physical layer) communication. For example, the signal processing unit 31 performs signal processing such as PCS (Physical Coding Sublayer), PMA (Physical Medium Attachment), and PMD (Physical Media Dependent).

The signal processing unit 31 converts the logical signal transmitted from the MAC device 20 into an electric signal corresponding to the communication of the physical layer and transmits it. Further, the signal processing unit 31 converts an electric signal transmitted from the outside of the communication device 100 into a logical signal and sends it to the MAC device 20.

Further, LAN connectors 40A, 40B, 40C and 40D, which are input / output ends of signals with the outside of the communication device 100, are provided at the end of the PHY device 30. The LAN connectors 40A and 40B are connectors that function as input / output terminals for signals transmitted and received between the communication device 100 and the external communication device.

On the other hand, the LAN connectors 40C and 40D are connectors for returning the signal corresponding to the communication confirmation packet in the communication path, and are loop-connected (that is, short-circuited) to each other. That is, the LAN connectors 40C and 40D are connected to each other without the communication device 100 communicating with the external device via a network.

The communication confirmation packet sent from the CPU device 20 passes through the communication port P3 connected to the input / output buffer 22C of the MAC device 20, is supplied to the PHY device 30, and is returned at the LAN connectors 40C and 40D. Then, the communication confirmation packet input from the LAN connector 40D to the PHY device 30 passes through the communication port P4 and the input / output buffer 22D, is supplied to the MAC device 20, and is transferred from the MAC device 20 to the CPU device 20.

In this way, the communication confirmation packet that has passed through the communication port P3 is returned at the LAN connectors 40C and 40D without being transmitted to the external device via the network, passes through the communication port P4, and returns to the MAC device 20 again. .. That is, the communication ports P3 and P4 are connected without going through the network while sandwiching the LAN connectors 40C and 40D.

Next, the processing operation of the communication confirmation of the communication path using the communication confirmation packet by the communication device 100 of this embodiment will be described with reference to the sequence diagram of FIG.

First, the monitoring packet first processing unit 14 of the CPU device 10 generates a communication confirmation packet. Then, the monitoring packet first processing unit 14 uses the address of the normally used IP interface (that is, the normal IF 141) as the transmission source, and the address of the receiving IP interface provided in the monitoring packet second processing unit 15 (that is, that is). , The reception IF 151) is used as the transmission destination, and the communication confirmation packet is transmitted (S101).

The L2 processing unit 21 of the MAC device 20 receives a communication confirmation packet from the CPU device 10, and performs signal processing for layer 2 (data link layer) communication on the received communication confirmation packet (S102). As a result, the communication confirmation packet is converted into a logical signal corresponding to the communication of the data link layer.

The L2 processing unit 21 sends out the logic signal (S103). The transmitted logic signal is supplied to the PHY device 30 via the input / output buffer 22C and the communication port P3.

The signal processing unit 31 of the PHY device 30 receives the supplied logic signal and performs signal processing for the layer 1 (physical layer) communication on the received logic signal (S104). As a result, the logical signal is converted into an electric signal corresponding to the communication of the physical layer.

The signal processing unit 31 sends out an electric signal converted from a logical signal. The transmitted electric signal is input to the signal processing unit 31 again via the LAN connector 40C and the LAN connector 40D. That is, the electric signal corresponding to the communication confirmation packet is returned in the communication path inside the communication device 100 without being transmitted to the outside of the communication device 100 (S105).

The signal processing unit 31 performs signal processing on the electric signal input via the LAN connector 40D (S106). As a result, the electric signal is converted into a logical signal. The signal processing unit 31 sends a logic signal to the MAC device 20 (S107).

The logic signal transmitted from the signal processing unit 31 of the PHY device 30 is supplied to the L2 processing unit 21 of the MAC device 20 via the communication port P4 and the input / output buffer 22D. The L2 processing unit 21 performs signal processing on the supplied logic signal (S108). As a result, the logical signal is converted into a communication confirmation packet.

The L2 processing unit 21 sends a communication confirmation packet toward the CPU device 10 (S109). The monitoring packet second processing unit 15 of the CPU device 10 receives the communication confirmation packet (S110).

Upon receiving the communication confirmation packet, the monitoring packet second processing unit 15 returns a response to the address of the normally used IP interface of the monitoring packet first processing unit 14 (that is, the normal IF 141). The monitoring packet first processing unit 14 confirms whether or not an abnormality has occurred in the communication path (that is, detection of the abnormality occurrence) based on the response from the monitoring packet second processing unit 15 (S111).

FIG. 3 is a diagram schematically showing a signal path of a signal transmitted / received in the communication confirmation process.

As shown by the broken line arrow, the communication confirmation packet sent from the monitoring packet first processing unit 14 is supplied to the MAC device 20 via the service packet processing unit 11 and the input / output buffer 12 in the CPU device 10, and is supplied to the MAC device 20. It is supplied to the PHY device 30 via 22C and the communication port P3. Then, it is folded back at the LAN connectors 40C and 40D provided at the end of the PHY device 30, passes through the communication port P4 and the input / output buffer 22D, is supplied from the MAC device 20 to the CPU device 10, and is supplied to the CPU device 10. Received by 15.

As described above, the communication device 100 of the present embodiment is provided with the monitoring packet first processing unit 14 for transmitting the communication confirmation packet and the monitoring packet second processing unit 15 for receiving the communication confirmation packet. Separately, communication confirmation packets are generated and transmitted / received. The MAC device 20 is provided with communication ports P3 and P4 for relaying the communication confirmation packet, in addition to the communication ports P1 and P2 for relaying the normal packet.

According to such a configuration, since the communication confirmation packet is transmitted and received separately from the transmission and reception of the normal packet, it is possible to confirm the communication of the communication path while suppressing the influence on the normal communication service.

Further, in the communication confirmation process of the present embodiment, the communication confirmation packet travels in the communication path in one direction and then returns at a pair of output ends (LAN connectors 40C and 40D) provided at the end of the PHY device 30. Then, the communication path travels in the other direction opposite to the direction of 1, and is received by the monitoring packet second processing unit 15.

According to such a configuration, unlike the case where PING is transmitted to an external device and communication confirmation of the communication path is performed based on the response, communication is performed without depending on whether or not a communication confirmation packet is returned from the external device. It is possible to detect an abnormality in the communication path in the device.

That is, in an environment where transmission and response of PING or the like for the purpose of life-and-death monitoring are not allowed, no abnormality appears in the device counter without link down, which occurs in devices in communication devices such as CPU devices. In such a failure state, an abnormality could not be detected, and there was a possibility that the service outage state would continue. However, by performing the communication confirmation process as in this embodiment, it is possible to detect such a failure state as an abnormality.

Next, Example 2 of the present invention will be described. FIG. 4 is a block diagram showing the configuration of the communication device 200 according to the second embodiment of the present invention.

In the communication device 200 of this embodiment, the communication port P3 and the communication port P4, which are communication ports for the communication confirmation packet, are loop-connected (that is, short-circuited) to each other. Therefore, when the communication confirmation packet is output from the input / output buffer 22C to the communication port P3 through signal processing by the L2 processing unit 21 of the MAC device 20, the communication confirmation packet is input / output again through the communication port P4 without reaching the PHY device 30. It is input to the buffer 22D.

Further, in the communication device 200 of the present embodiment, since the communication confirmation packet is not supplied to the PHY device 30, the PHY device 30 is connected to the input / output terminal of the signal corresponding to the communication confirmation packet (that is, the LAN connector 40C in the first embodiment). And 40D) are not provided.

Next, the processing operation of the communication confirmation of the communication path using the communication confirmation packet by the communication device 200 of this embodiment will be described with reference to the sequence diagram of FIG.

First, the monitoring packet first processing unit 14 of the CPU device 10 generates a communication confirmation packet. Then, the monitoring packet first processing unit 14 uses the address of the normally used IP interface (that is, the normal IF 141) as the transmission source, and the address of the receiving IP interface provided in the monitoring packet second processing unit 15 (that is, that is). , The reception IF 151) is used as the transmission destination, and the communication confirmation packet is transmitted (S201).

The L2 processing unit 21 of the MAC device 20 receives a communication confirmation packet from the CPU device 10, and performs signal processing for layer 2 (data link layer) communication on the received communication confirmation packet (S202). As a result, the communication confirmation packet is converted into a logical signal corresponding to the communication of the data link layer.

The L2 processing unit 21 sends out the logic signal. The transmitted logical signal passes through the input / output buffer 22C and the communication port P3, then passes through the communication port P4, enters the input / output buffer 22D, and is supplied to the L2 processing unit 21 again. That is, the logical signal corresponding to the communication confirmation packet is folded back at the end of the MAC device 20 (that is, communication ports P3 and P4) in the communication path in the communication device 100 (S203).

The L2 processing unit 21 performs signal processing on the supplied logic signal (S204). As a result, the logical signal is converted into a communication confirmation packet.

The L2 processing unit 21 sends a communication confirmation packet toward the CPU device 10 (S205). The monitoring packet second processing unit 15 of the CPU device 10 receives the communication confirmation packet (S206).

Upon receiving the communication confirmation packet, the monitoring packet second processing unit 15 returns a response to the address of the normally used IP interface of the monitoring packet first processing unit 14 (that is, the normal IF 141). The monitoring packet first processing unit 14 confirms whether or not an abnormality has occurred in the communication path (that is, detection of an abnormality occurrence) based on the response from the monitoring packet second processing unit 15 (S207). ..

FIG. 5 is a diagram schematically showing a signal path of a signal transmitted / received in the communication confirmation process.

As shown by the broken line arrow, the communication confirmation packet sent from the monitoring packet first processing unit 14 is supplied to the MAC device 20 via the service packet processing unit 11 in the CPU device 10 and the input / output buffer 12. Then, it is turned back at the communication ports P3 and P4, passes through the input / output buffer 22D, is supplied from the MAC device 20 to the CPU device 10, and is received by the monitoring packet second processing unit 15.

According to such a configuration, since the communication confirmation packet is transmitted and received separately from the transmission and reception of the normal packet, it is possible to confirm the communication of the communication path while suppressing the influence on the normal communication service. In addition, it is possible to detect an abnormality in the communication path in the communication device without depending on whether or not a communication confirmation packet is returned from the external device.

In the communication device 200 of the present embodiment, the target range of the communication confirmation of the communication path is limited as compared with the case of the first embodiment, but the signal input / output terminal for the communication confirmation packet (that is, the first embodiment) Since it is not necessary to provide the LAN connectors 40C and 40D) in the PHY device 30, it is possible to compactly confirm the communication of the communication path while suppressing the scale of the device.

The embodiments of the present invention are not limited to those described in the above examples. For example, in the above embodiment, a case where the communication confirmation packet is folded back at the input / output end of the end of the PHY device 30 (Example 1) and a case where the communication confirmation packet is folded back at the communication port at the end of the MAC device 20 (Example 2) will be described. did. However, the place where the communication confirmation packet is returned is not limited to this. For example, a return route different from the normal communication service may be created by using a surplus port for expansion. In that case, since the surplus port can be included in the communication confirmation target of the communication path, it is possible to confirm the normality of the unused port as hardware.

In addition, the communication confirmation process of this embodiment can be used in combination with the conventional life-and-death monitoring using PING or the like. It can also be used in combination with anomaly detection using a packet counter.

Further, the timing for executing the communication confirmation process of this embodiment can be arbitrarily set. For example, the normal communication service may be performed during execution, or the normal communication service may be stopped to provide a period for the communication confirmation process, and the communication confirmation process may be performed during the period.

Further, in the above embodiment, an example in which the monitoring packet first processing unit 14 for transmitting the communication confirmation packet and the monitoring packet second processing unit 15 for receiving the communication confirmation packet are separately provided has been described. It may be configured as an integrated monitoring packet processing unit. That is, the monitoring packet processing unit may have an IP interface address as a transmission source and an IP interface address for reception, and may be configured to transmit a communication confirmation packet to the reception address. ..

Further, in the above embodiment, the communication ports P1 and P2 are used for normal communication services, and the communication ports P3 and P4 are used for communication confirmation processing. However, the communication port is selected according to the type of packet to be communicated. (Switching) may be performed, for example, by the CPU device 10 controlling the MAC device 20, or may be configured so that the MAC device 20 itself executes the MAC device 20 according to a predetermined program. The same applies to the selection of the input / output buffers 22A to 22D and the selection of the LAN connectors 40A to 40D in the PHY device 30.

100 Communication device 10 CPU device 11 Service packet processing unit 12 I / O buffer 13 Physical failure detection unit 14 Monitoring packet 1st processing unit 15 Monitoring packet 2nd processing unit 20 MAC device 21 L2 processing unit 22A I / O buffer 22B I / O buffer 22C Input / output buffer 22D Input / output buffer 30 PHY device 31 Signal processing unit 40A LAN connector 40B LAN connector 40C LAN connector 40D LAN connector 141 Normal IP interface 151 Reception IP interface

Claims (7)

A communication device that communicates with an external device via a network.
A processing control unit that generates communication packets,
A first transfer unit that transfers the communication packet sent from the processing control unit using a communication protocol corresponding to the data link layer, and a first transfer unit.
A second transfer unit that transfers the communication packet transferred by the first transfer unit to the external device using a communication protocol corresponding to the physical layer, and a second transfer unit.
Have,
The processing control unit generates a communication confirmation packet, which is a communication packet for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit.
The first transfer unit relays the transfer of the communication packet sent from the processing control unit to the second transfer unit, and is connected to a normal communication port connected to the network and not via the network. It has a pair of communication confirmation ports for communication confirmation.
The processing control unit sends the communication confirmation packet through one of the pair of communication confirmation communication ports, and the communication confirmation packet is returned via one and the other of the pair of communication confirmation communication ports. Is received, and the communication of the communication path is confirmed based on the reception result. The second transfer unit has a communication packet input / output end that is an input / output end of the communication packet to the network, and a pair of communication confirmation input / output ends that are connected to each other without going through the network. ,
The processing control unit sends out the communication confirmation packet so as to pass through one of the pair of communication confirmation input / output ends, and is folded back via one and the other of the pair of communication confirmation input / output ends. The communication device according to claim 1, wherein the communication confirmation packet is received. The communication device according to claim 2, wherein one of the pair of communication confirmation input / output ends and the other are loop-connected to each other. One of the pair of communication confirmation communication ports and the other are loop-connected to each other.
The communication device according to claim 1, wherein the processing control unit receives the communication confirmation packet that has passed through the loop-connected portion of the pair of communication confirmation communication ports and is returned. The processing control unit
A communication confirmation packet transmission unit having a first address and transmitting the communication confirmation packet,
A communication confirmation packet receiving unit having a second address and receiving the communication confirmation packet,
Including
The communication confirmation packet transmission unit according to any one of claims 1 to 4, wherein the communication confirmation packet transmission unit transmits the communication confirmation packet with the first address as a transmission source and the second address as a transmission destination. Communication device. It was transferred by a processing control unit that generates a communication packet, a first transfer unit that transfers the communication packet sent from the processing control unit using a communication protocol corresponding to the data link layer, and the first transfer unit. Detects an abnormality in the communication path inside a communication device that has a second transfer unit that transfers the communication packet to an external device using a communication protocol corresponding to the physical layer and communicates with the external device via a network. Anomaly detection method
A step of generating a communication confirmation packet, which is a communication packet for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit.
The communication confirmation packet from the processing control unit toward the first transfer unit so as to pass through one of a pair of communication confirmation communication ports provided in the first transfer unit and connected without going through the network. And the steps to send
A step of receiving the communication confirmation packet returned via one and the other of the pair of communication confirmation communication ports, and a step of receiving the communication confirmation packet.
The step of confirming the communication of the communication path based on the reception result, and
Anomaly detection method comprising. It was transferred by a processing control unit that generates a communication packet, a first transfer unit that transfers the communication packet sent from the processing control unit using a communication protocol corresponding to the data link layer, and the first transfer unit. A communication device having a second transfer unit that transfers the communication packet to the external device using a communication protocol corresponding to the physical layer, and communicating with the external device via a network.
A step of generating a communication confirmation packet, which is a communication packet for confirming communication of a communication path in the communication device passing through the processing control unit, the first transfer unit, and the second transfer unit.
The communication confirmation packet from the processing control unit toward the first transfer unit so as to pass through one of a pair of communication confirmation communication ports provided in the first transfer unit and connected without going through the network. And the steps to send
A step of receiving the communication confirmation packet returned via one and the other of the pair of communication confirmation communication ports, and a step of receiving the communication confirmation packet.
The step of confirming the communication of the communication path based on the reception result, and
A program characterized by executing.

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