WO2009107198A1 - Transmission device, method for confirming conductivity, and program for confirming conductivity - Google Patents

Abstract

A transmission device which is capable of detecting the RDI alarm accurately in operating the CC function of the Ethernet®-OAM on the L2VPN network configured in a multipoint connection manner, a method for confirming conductivity, and a program for confirming conductivity. When the LOC alarm is detected for other transmission device, a CCM frame transmission section (132a) sends a CCM frame where “1” is set in an RDI region and an identifier for a transmission device targeted for detection of the LOC alarm is set in an identifier region for a node targeted for detection of the LOC alarm. When a CCM frame is received from other transmission device where “1” is set in an RDI region and an identifier for the other device itself is set in an identifier region for a node targeted for detection of the LOC alarm, an own device's fault judging section (133a) detects the RDI alarm for the transmission device which is a transmission source of the CCM frame.

Description

Transmission device, continuity confirmation method, and continuity confirmation program

The present invention relates to a transmission apparatus that periodically transmits / receives a CCM frame for confirming continuity with another transmission apparatus to / from another transmission apparatus, a continuity confirmation method for such a transmission apparatus, and the like. The present invention relates to a continuity confirmation program for realizing a continuity confirmation method.

Conventionally, various techniques have been devised for maintaining and managing Ethernet (registered trademark) in order to reliably detect a failure of an apparatus (for example, a layer 2 switch) constituting the Ethernet (registered trademark) ( For example, see Patent Document 1).

In recent years, as a technology for maintaining and managing various events that occur on the wide area Ethernet (registered trademark), the International Telecommunications Union's Telecommunication Standardization Sector (ITU-T) “Y. Ethernet (registered trademark) -OAM (Ethernet-Operations Administration Maintenance) standardized as “1731” is used. Note that Ethernet (registered trademark) -OAM is being standardized as “IEEE802.1ag” even in IEEE (The Institute of Electrical and Electronics Engineers, Inc).

This Ethernet (registered trademark) -OAM is a protocol for maintaining and managing various events that occur at the layer 2 level. As a typical function, it is a continuity between transmission apparatuses (for example, layer 2 switches). There is a CC (Continuity Check) function.

The CC function will be specifically described with reference to FIGS. 15-1, 15-2, and 16. FIG. The network shown in FIG. 15A is configured by connecting transmission apparatuses 10a and 10b by point-to-point. The transmission apparatuses 10a and 10b are layer 2 switches corresponding to Ethernet (registered trademark) -OAM, and assume that the CC function is used.

The “identifier” in the rectangles of the transmission apparatuses 10a and 10b shown in FIG. 15-1 is a terminal apparatus (MEP: MEG) in a group (MEG: Maintenance Entity Group) managed by Ethernet (registered trademark) -OAM. Indicates identification information (MEPID: MEG End Point ID) for uniquely identifying the End Point. In addition, the left rectangle of CCM (Continuity Check Message) frames F11a and F11b divided into three rectangles indicates DA (Destination Address), and the center rectangle indicates SA (Source Address). The rectangle on the right indicates items other than DA and SA. In the figure, the identifiers of the transmission devices are shown in DA and SA, but actually, the MAC (Media Access Control) address of the transmission device is set. That is, the MAC address of the transmission apparatus 10b with the identifier “B” is set in the DA of the CCM frame F11a, and the MAC address of the transmission apparatus 10a with the identifier “A” is set in the SA.

Under such a configuration, the transmission apparatus 10a periodically transmits a CCM frame F11a having a format as shown in FIG. 16 to the transmission apparatus 10b. Similarly, the transmission device 10b periodically transmits a CCM frame F11b to the transmission device 10a.

The transmission apparatus 10a determines that the transmission apparatus 10b is operating normally while periodically receiving the CCM frame F11b from the transmission apparatus 10b. Similarly, the transmission apparatus 10b determines that the transmission apparatus 10a is operating normally while periodically receiving the CCM frame F11a from the transmission apparatus 10a.

On the other hand, as in the example illustrated in FIG. 15B, when a failure or abnormality occurs in the transmission apparatus 10b and the CCM frame F11b is not received from the transmission apparatus 10b, the transmission apparatus 10a is connected to the transmission apparatus 10b. Is detected as an LOC (Loss of Connectivity) alarm (hereinafter referred to as “LOC alarm”). At this time, the transmission device 10a stores information indicating that the LOC alarm has been detected for the transmission device 10b in a predetermined storage unit. Then, the transmission device 10a notifies the network administrator that the LOC alarm has been detected.

Further, when the LOC alarm is detected, the transmission device 10a transmits the CCM frame F12a in which “1” is set in the RDI (Remote Defect Indication) area to the transmission device 10b as illustrated in FIG. 15-2. To do. When “1” is set in the RDI area of the CCM frame F12a, this indicates that the transmission apparatus 10a detects a LOC alarm, and when “0” is set in the RDI area, the transmission apparatus 10a. Indicates that no LOC alarm has been detected.

The transmission apparatus 10b that has received the CCM frame F12a recognizes that the LOC alarm has been detected by the transmission apparatus 10a, and detects an alarm called RDI (hereinafter referred to as “RDI alarm”). At this time, the transmission device 10b stores information indicating that an RDI alarm has been detected for the transmission device 10a in a predetermined storage unit. Then, the transmission device 10b notifies the network administrator that the RDI alarm has been detected.

As described above, when the CC function described above is used, the network administrator can monitor whether or not continuity between transmission apparatuses is secured. In the case of the example illustrated in FIG. 15B, the network administrator receives the LOC alarm detection notification from the transmission device 10a and receives the RDI alarm detection notification from the transmission device 10b, thereby transmitting the transmission device 10a and the transmission device. It can be known that the continuity with 10b is cut off.

JP-A-7-226762

However, the Ethernet (registered trademark) -OAM CC function mentioned above cannot accurately detect the RDI alarm when the transmission device operates on an L2VPN (Layer 2 Virtual Private Network) network that realizes multipoint connection. There was a problem.

Such problems will be specifically described with reference to FIGS. 17-1 and 17-2. The L2VPN network shown in FIG. 17A is configured by multipoint connection of transmission apparatuses 10c to 10e. When the CC function operates on the network configured as described above, the transmission device 10c periodically transmits a CCM frame F11c in which “0” is set in the RDI area to the transmission devices 10d and 10e. At this time, the transmission apparatus 10c transmits a CCM frame F11c in which a multicast address is set in DA. In the figure, “*” shown in DA of the CCM frame F11c indicates a multicast address.

Similarly, the transmission device 10d periodically transmits a CCM frame F11d in which a multicast address is set in DA and “0” is set in the RDI area, and the transmission device 10e sets a multicast address in DA, In addition, the CCM frame F11e in which “0” is set in the RDI area is periodically transmitted. In this way, the transmission apparatuses 10c to 10e perform continuity confirmation with each other.

Here, as in the example illustrated in FIG. 17-2, when some failure or abnormality occurs in the transmission apparatus 10e and the CCM frame F11e is no longer received from the transmission apparatus 10e, the transmission apparatus 10c transmits the transmission apparatus 10e. LOC alarm is detected. Then, the transmission apparatus 10c transmits a CCM frame F12c in which a multicast address is set in DA and “1” is set in the RDI area.

The CCM frame F12c transmitted from the transmission device 10c is received by the transmission devices 10d and 10e. That is, the transmission device 10d detects an RDI alarm for the transmission device 10c, and notifies the network administrator that the RDI alarm has been detected.

Similarly, the transmission apparatus 10d detects a LOC alarm for the transmission apparatus 10e, transmits a CCM frame F12d in which a multicast address is set in DA and “1” is set in the RDI area. Therefore, the transmission apparatus 10c detects an RDI alarm for the transmission apparatus 10d, and notifies the network administrator that the RDI alarm has been detected.

However, since continuity with the transmission devices 10c and 10d is ensured, the RDI alarm detected by the transmission device 10d is unnecessary. For the same reason, the RDI alarm detected by the transmission device 10c is unnecessary. When an unnecessary RDI alarm is notified, the network administrator needs to investigate the failure of the normally operating transmission apparatus, and wasteful investigation operation is required.

As described above, when the conventional CC function is operated on a network configured by multipoint connection, there is a problem that the transmission device cannot accurately detect the RDI alarm. As a result, an originally unnecessary RDI alarm is notified to the network administrator.

Although it is possible to disable the RDI alarm detection function of the CC function, if the RDI alarm detection function is disabled, the maintenance function is disabled because the transmission device on the CCM frame cannot detect an abnormality. The problem of degradation occurs. In particular, in recent years, L2VPN that realizes multipoint connection is becoming widespread, and it is required to provide an L2VPN network that has a maintenance function similar to a dedicated line. Thus, the CC function cannot be operated.

Under these circumstances, when the CC function is operated on the L2VPN network configured by multipoint connection, an important issue is how to realize a technology capable of accurately detecting the RDI alarm. It was.

The present invention has been made in order to solve the above-described problems caused by the prior art. When the CC function of Ethernet (registered trademark) -OAM is operated on an L2VPN network configured by multipoint connection, an RDI alarm is provided. It is an object of the present invention to provide a transmission device, a continuity confirmation method, and a continuity confirmation program that can accurately detect the above.

In order to solve the above-described problems and achieve the object, the transmission device disclosed in the present application periodically transmits a confirmation frame for confirming continuity between the transmission device and another transmission device. A transmission apparatus that transmits and receives data in the transmission apparatus, wherein when a confirmation frame is not received for a certain period from one of the other transmission apparatuses, another apparatus abnormality determination unit that determines that an abnormality has occurred in the transmission apparatus; A confirmation frame in which identification information for identifying an abnormal transmission device that is determined to be abnormal by the device abnormality determination means and abnormality detection information indicating that an abnormality has been detected is set, When identification information of the transmission device and abnormality detection information are set in the confirmation frame transmission means for transmitting to the other transmission device and the confirmation frame received from the other transmission device It is a requirement that the apparatus includes an own apparatus abnormality determination unit that determines that an abnormality has occurred in the transmission apparatus by the transmission apparatus that is the transmission apparatus of the confirmation frame. .

In the above aspect, the transmission apparatus disclosed in the present application may be configured such that the other apparatus abnormality determination unit receives a CCM frame conforming to Ethernet (registered trademark) -OAM as a confirmation frame from one of the other transmission apparatuses for a certain period. If not received, it is determined that an abnormality has occurred in the transmission device, and the confirmation frame transmitting means uses the CCM frame in which the identification information of the abnormality transmission device and the abnormality detection information are set as the other When the CCM frame received from the other transmission apparatus includes identification information and abnormality detection information of the transmission apparatus, the own apparatus abnormality determination means transmits the CCM frame to the transmission apparatus. It is necessary to determine that the transmission apparatus has detected that an abnormality has occurred in the transmission apparatus.

In the above aspect, the transmission device disclosed in the present application requires that the confirmation frame transmission unit sets identification information of the abnormality occurrence transmission device in a reserved area that is an unused area in the confirmation frame. To do.

Further, in the above aspect, in the transmission device disclosed in the present application, the confirmation frame transmission unit sets the identification information of the abnormality occurrence transmission device in a zero fixed region that is a region in which zero is fixedly set in the confirmation frame. It is a requirement to do.

In the above aspect, the transmission apparatus disclosed in the present application requires that the confirmation frame transmission unit sets identification information of the abnormality occurrence transmission apparatus in an extended area that is an area obtained by extending the confirmation frame. .

It should be noted that a transmission device disclosed in the present application in which any component, expression, or any combination of components is applied to a method, device, system, computer program, recording medium, data structure, etc. is also effective as another aspect. .

According to the transmission device disclosed in the present application, an RDI alarm can be accurately detected even when a network is configured by multipoint connection.

FIG. 1 is a diagram for explaining the outline of the transmission apparatus according to the first embodiment. FIG. 2 is a diagram illustrating an example of a format of a CCM frame transmitted by the transmission apparatus according to the first embodiment. FIG. 3 is a block diagram showing a configuration of the transmission apparatus shown in FIG. FIG. 4A is a diagram of an example of the abnormality detection status storage unit. FIG. 4B is a diagram of an example of the abnormality detection status storage unit. FIG. 4C is a diagram of an example of the abnormality detection status storage unit. FIG. 5 is a flowchart showing the LOC alarm detection processing procedure by the other apparatus abnormality determination unit shown in FIG. FIG. 6 is a flowchart showing a CCM frame transmission processing procedure by the CCM frame transmission unit shown in FIG. FIG. 7 is a flowchart showing an RDI alarm detection processing procedure by the own apparatus abnormality determination unit shown in FIG. FIG. 8 is a diagram illustrating an example of a format of a CCM frame transmitted by the transmission apparatus according to the second embodiment. FIG. 9 is a diagram for explaining an application example of the transmission apparatus according to the second embodiment. FIG. 10A is a diagram of an example of the abnormality detection status storage unit. FIG. 10B is a diagram of an example of the abnormality detection status storage unit. FIG. 11 is a diagram illustrating an example of a format of a CCM frame transmitted by the transmission apparatus according to the third embodiment. FIG. 12 is a diagram for explaining an application example of the transmission apparatus according to the third embodiment. FIG. 13A is a diagram of an example of the abnormality detection status storage unit. FIG. 13-2 is a diagram of an example of the abnormality detection status storage unit. FIG. 14 is a block diagram illustrating a configuration of a transmission apparatus that executes a continuity confirmation program. FIG. 15A is a diagram for explaining a conventional CC function. FIG. 15-2 is a diagram for explaining a conventional CC function. FIG. 16 shows a conventional CCM frame format. FIG. 17A is a diagram for explaining a conventional CC function. FIG. 17-2 is a diagram for explaining a conventional CC function.

Explanation of symbols

R10 Reserved area R21 to R25 0 Fixed area R30 Extended area F11a to F11e CCM frame F12a CCM frame F12c CCM frame F12d CCM frame F101c CCM frame F102a, F102b CCM frame 10a to 10e Transmission apparatus 100a to 100c Transmission apparatus 110a I / F section 120a ~ 120c Abnormality detection status storage unit 130a Control unit 131a Other device abnormality determination unit 132a to 132c CCM frame transmission unit 133a to 133c Own device abnormality determination unit 134a Alarm notification unit 200a to 200m Transmission device 220a, 220k Abnormality detection status storage unit 300a to 300m transmission device 320a, 320m abnormality detection status storage unit 100 Transmission apparatus 1010 CPU
1020 Network interface 1030 RAM
1031 Continuity confirmation process 1032 Abnormality detection status data 1040 ROM
1041 Conductivity confirmation program 1050 Bus

Hereinafter, embodiments of a transmission apparatus, a continuity confirmation method, and a continuity confirmation program according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

First, the outline of the transmission apparatus according to the first embodiment will be described. FIG. 1 is a diagram for explaining the outline of the transmission apparatus according to the first embodiment. The L2VPN network shown in the figure is configured by multipoint connection of transmission apparatuses 100a to 100c. The CC function operates on this L2VPN network.

The transmission apparatuses 100a to 100c are apparatuses having a layer 2 switch function corresponding to Ethernet (registered trademark) -OAM. The transmission devices 100a to 100c periodically transmit a CCM frame to a multicast address for the purpose of confirming mutual continuity.

Then, the transmission apparatuses 100a to 100c determine that the continuity with the other transmission apparatuses 100a to 100c is ensured while the CCM frame is regularly received from the other transmission apparatuses 100a to 100c. When the CCM frame is not received from the transmission apparatuses 100a to 100c for a certain period, it is determined that the continuity with the other transmission apparatuses 100a to 100c is disconnected, and a LOC alarm is issued to the other transmission apparatuses 100a to 100c. Is detected.

Under such a configuration, as illustrated in FIG. 1, when some failure or abnormality occurs in the transmission apparatus 100c and the CCM frame F101c is no longer received from the transmission apparatus 100c, the transmission apparatus 100a transmits to the transmission apparatus 100c. In contrast, a LOC alarm is detected. Similarly, the transmission device 100b detects a LOC alarm for the transmission device 100c.

When the transmission apparatus 100a according to the first embodiment detects the LOC alarm, the transmission apparatus 100a sets “1” in the RDI area and also sets the identifier “C” of the transmission apparatus 100c that is the detection target of the LOC alarm. F102a is transmitted to the multicast address.

Here, FIG. 2 shows an example of the format of the CCM frame transmitted by the transmission apparatuses 100a to 100c according to the first embodiment. As indicated by hatching in the figure, the transmission apparatuses 100a to 100c according to the first embodiment transmit the reserve area R10, which is an unused area in the conventional CCM frame shown in FIG. This is used as the “LOC alarm detection target node identifier” area for setting the device identifier. That is, the transmission apparatus 100a illustrated in FIG. 1 transmits the CCM frame F102a in which the identifier “C” of the transmission apparatus 100c that is the LOC alarm detection target is set in the LOC alarm detection target node identifier area.

The transmission apparatus 100b that has received the CCM frame F102a has “1” set in the RDI area of the CCM frame F102a, but the identifier “B” of the own apparatus is not set in the LOC alarm detection target node identifier area. The RDI alarm is not detected for the transmission apparatus 100a. That is, the transmission apparatus 100b does not notify the network administrator that the RDI alarm has been detected.

On the other hand, the transmission apparatus 100c that has received the CCM frame F102a has “1” set in the RDI area of the CCM frame F102a, and the identifier “C” of the own apparatus is set in the LOC alarm detection target node identifier area. The RDI alarm is detected for the transmission apparatus 100a. Then, the transmission device 100c notifies the network administrator that the RDI alarm has been detected.

Similarly, when the transmission apparatus 100b detects a LOC alarm for the transmission apparatus 100c, the transmission apparatus 100b sets “1” in the RDI area and sets the identifier “C” of the transmission apparatus 100c in the LOC alarm detection target node identifier area. The CCM frame F102b is transmitted to the multicast address.

The transmission apparatus 100a that has received the CCM frame F102b does not detect the RDI alarm for the transmission apparatus 100b because the identifier “A” of the own apparatus is not set in the LOC alarm detection target node identifier area of the CCM frame F102b. On the other hand, the transmission apparatus 100c that has received the CCM frame F102b has “1” set in the RDI area of the CCM frame F102b, and the identifier “C” of the own apparatus is set in the LOC alarm detection target node identifier area. The RDI alarm is detected for the transmission apparatus 100b. Then, the transmission device 100c notifies the network administrator that the RDI alarm has been detected.

As described above, when the transmission apparatuses 100a to 100c according to the first embodiment detect the LOC alarm for the other transmission apparatuses, the transmission apparatuses 100a to 100c set “1” in the RDI area and the LOC alarm detection target node identifier area. A CCM frame in which the identifier of the alarm detection target transmission device is set is transmitted, and “1” is set in the RDI area from another transmission device, and the identifier of the own device is set in the LOC alarm detection target node identifier region. Since the RDI alarm is detected when the received CCM frame is received, the RDI alarm can be accurately detected even when the network is configured by multipoint connection. In other words, since the transmission apparatus that should not detect the RDI alarm does not detect the RDI alarm, the transmission apparatuses 100a to 100c according to the first embodiment may notify the network administrator of only the necessary RDI alarm. it can. As a result, the network administrator can investigate the failure only for the transmission apparatus in which the failure actually occurs.

Next, the configuration of the transmission apparatuses 100a to 100c shown in FIG. 1 will be described. FIG. 3 is a block diagram illustrating a configuration of the transmission apparatus 100a illustrated in FIG. Note that the transmission apparatuses 100a to 100c all have the same configuration, and therefore, here, the transmission apparatus 100a will be mainly described as an example. In the figure, only the configuration related to the CC function is shown and described.

The transmission apparatus 100a shown in the figure is an apparatus having a layer 2 switch function corresponding to Ethernet (registered trademark) -OAM, and includes an interface (hereinafter referred to as “I / F”) unit 110a and an abnormality detection status storage. Part 120a and control part 130a. The I / F unit 110a is an interface for transmitting and receiving information via the L2VPN network.

The abnormality detection status storage unit 120a stores the alarm status detected for the other transmission devices 100b and 100c in association with the identifiers of the other transmission devices 100b and 100c constituting the L2VPN network.

An example of the abnormality detection status storage unit 120a is shown in FIG. An example of the abnormality detection status storage unit 120b included in the transmission device 100b is illustrated in FIG. 4-2, and an example of the abnormality detection status storage unit 120c included in the transmission device 100c is illustrated in FIG. 4-3.

The abnormality detection status storage unit 120a illustrated in FIG. 4A is a state after the transmission apparatus 100a illustrated in FIG. 1 detects a LOC alarm for the transmission apparatus 100c and receives the CCM frame F102b from the transmission apparatus 100b. Indicates.

In addition, the abnormality detection status storage unit 120b illustrated in FIG. 4B is configured so that the transmission apparatus 100b illustrated in FIG. 1 detects a LOC alarm for the transmission apparatus 100c and receives the CCM frame F102a from the transmission apparatus 100a. Shows the state.

Also, the abnormality detection status storage unit 120c illustrated in FIG. 4C is configured so that the transmission apparatus 100c illustrated in FIG. 1 receives the CCM frame F102a from the transmission apparatus 100a and detects an RDI alarm for the transmission apparatus 100a. The state after receiving the CCM frame F102b from the transmission apparatus 100b and detecting the RDI alarm with respect to the transmission apparatus 100b is shown.

As shown in FIGS. 4-1 to 4-3, the abnormality detection status storage units 120a to 120c have items such as a transmission device identifier, an abnormality detection status, and a last reception date and time. The transmission device identifier indicates identification information for identifying another transmission device.

The abnormality detection status storage unit 120a illustrated in FIG. 4A stores the identifiers “B” and “C” of the transmission apparatuses 100b and 100c other than the transmission apparatus 100a configuring the L2VPN network illustrated in FIG. 1 in the transmission apparatus identifier. To do. Similarly, the abnormality detection status storage unit 120b illustrated in FIG. 4-2 stores the identifiers “A” and “C” of the transmission devices 100a and 100c in the transmission device identifier, and the abnormality detection status illustrated in FIG. 4-3. The storage unit 120c stores the identifiers “A” and “B” of the transmission apparatuses 100a and 100b in the transmission apparatus identifier.

The abnormality detection status indicates an alarm detected for the transmission device indicated by the transmission device identifier. In the abnormality detection states shown in FIGS. 4A to 4C, “LOC” is stored when a LOC alarm is detected for the transmission device indicated by the transmission device identifier, and the transmission device indicated by the transmission device identifier is stored. “RDI” is stored when an RDI alarm is detected for “No”, and “no abnormality” is stored when neither a LOC alarm nor an RDI alarm is detected for the transmission apparatus indicated by the transmission apparatus identifier. An example is shown.

The last reception date and time indicates the date and time when the CCM frame was last received from the transmission device indicated by the transmission device identifier. In the final reception date and time shown in FIGS. 4-1 to 4-3, only the hour, minute, and second are shown with the date omitted.

The control unit 130a performs various controls related to the CC function, and includes an other device abnormality determination unit 131a, a CCM frame transmission unit 132a, a self device abnormality determination unit 133a, and an alarm notification unit 134a.

The other apparatus abnormality determination unit 131a periodically determines whether or not a CCM frame is received from the transmission apparatus 100b or 100c, and if it does not receive a CCM frame from the transmission apparatus 100b or 100c within a certain period, Processing to detect that continuity with the transmission apparatus 100b or 100c transmitting the CCM frame is ensured when the LOC alarm is detected for the transmission apparatus 100b or 100c and the CCM frame is periodically received. Part.

Specifically, the other device abnormality determination unit 131a periodically acquires the last reception date and time of the abnormality detection status storage unit 120a. Then, the other apparatus abnormality determination unit 131a determines that the LOC alarm is issued to the transmission apparatus 100b or 100c when the acquired last reception date / time has passed a certain period, that is, when the CCM frame has not been received within the certain period. Is detected. Then, the other device abnormality determination unit 131a updates the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c targeted for LOC alarm detection to “LOC”.

For example, it is assumed that the current time is “10:30:30” and the certain period is “30 minutes”. In this case, in the example shown in FIG. 4-1, since the CCM frame is received 10 minutes ago from the transmission apparatus 100b indicated by the transmission apparatus identifier “B”, the other apparatus abnormality determination unit 131a performs the transmission apparatus 100b. LOC alarm is not detected. On the other hand, since the CCM frame is received 60 minutes ago from the transmission device 100c indicated by the transmission device identifier “C” and “30 minutes” has elapsed, the other device abnormality determination unit 131a The LOC alarm is detected for 100c, and the abnormality detection status is updated to “LOC”. Generally, the other apparatus abnormality determination unit 131a detects a LOC alarm when a CCM frame is not received within a time 3.5 times the CCM frame transmission cycle.

In addition, when the CCM frame is received from the transmission apparatus 100b or 100c within a certain period, the other apparatus abnormality determination unit 131a stores an abnormality detection status corresponding to the identifier of the transmission apparatus 100b or 100c that is the transmission source of the CCM frame. The abnormality detection status of the unit 120a is acquired. When the acquired abnormality detection status is “LOC”, the abnormality detection status is updated to “no abnormality”.

For example, as in the above example, it is assumed that the current time is “10:30:30” and the fixed period is “30 minutes”. Here, it is assumed that “10:20:00” is stored as the last reception date and time corresponding to the transmission device identification “C” of the abnormality detection status storage unit 120a illustrated in FIG. In this case, the CCM frame is received 10 minutes ago from the transmission device 100c indicated by the transmission device identifier “C”, and “LOC” is stored in the abnormality detection status corresponding to the transmission device identifier “C”. In such a case, the other device abnormality determination unit 131a determines that the continuity with the transmission device 100c has been recovered, and updates the abnormality detection status corresponding to the transmission device identification “C” from “LOC” to “no abnormality”.

The CCM frame transmission unit 132a is a processing unit that periodically generates a CCM frame based on information stored in the abnormality detection status storage unit 120a and transmits the generated CCM frame to a multicast address.

Specifically, the CCM frame transmission unit 132a acquires all information stored in the abnormality detection status of the abnormality detection status storage unit 120a. When “LOC” exists in the acquired abnormality detection status, the CCM frame transmission unit 132a sets “1” in the RDI area of the CCM frame, and sets the transmission device identifier whose abnormality detection status is “LOC”. , It is set in the LOC alarm detection target node identifier area of the CCM frame.

On the other hand, when “LOC” does not exist in the acquired abnormality detection status, the CCM frame transmitting unit 132a sets “0” in the RDI area of the CCM frame and nothing in the LOC alarm detection target node identifier area of the CCM frame. Not set.

For example, assume that the abnormality detection status storage unit 120a is in the state shown in FIG. In such a case, the CCM frame transmission unit 132a acquires “no abnormality” and “LOC” as the abnormality detection status from the abnormality detection status storage unit 120a. Since “LOC” exists in the acquired abnormality detection status, the CCM frame transmission unit 132a sets “1” in the RDI area, and a LOC alarm is detected in the LOC alarm detection target node identifier area. The identifier “C” of the transmission apparatus 100c is set. The CCM frame generated by the CCM frame transmission unit 132a corresponds to the CCM frame F102a illustrated in FIG.

Further, the transmission device 100b illustrated in FIG. 1 will be described as an example. The CCM frame transmission unit 132b included in the transmission device 100b is configured as “abnormality detection status” from the abnormality detection status storage unit 120b illustrated in FIG. “No abnormality” and “LOC” are acquired. Since “LOC” exists in the acquired abnormality detection status, the CCM frame transmission unit 132b sets “1” in the RDI area and a LOC alarm is detected in the LOC alarm detection target node identifier area. The identifier “C” of the transmission apparatus 100c is set. The CCM frame generated by the CCM frame transmission unit 132b corresponds to the CCM frame F102b illustrated in FIG.

Further, the transmission device 100c illustrated in FIG. 1 will be described as an example. The CCM frame transmission unit 132c included in the transmission device 100c has the abnormality detection status from the abnormality detection status storage unit 120c illustrated in FIG. RDI "and" RDI "are acquired. Since “LOC” does not exist in the acquired abnormality detection status, the CCM frame transmitting unit 132c sets “0” in the RDI area and sets nothing in the LOC alarm detection target node identifier area. Note that the transmission apparatus 100c illustrated in FIG. 1 is in a state where the generated CCM frame cannot be transmitted because some kind of failure or abnormality has occurred.

When the own device abnormality determination unit 133a receives the CCM frame from the transmission devices 100b and 100c, the own device abnormality determination unit 133a updates the last reception date and time of the abnormality detection status storage unit 120a and, based on the information set in the CCM frame, It is a processing unit that determines whether or not the transmission device 100b or 100c has detected a LOC alarm for its own device (here, the transmission device 100a).

Specifically, when receiving the CCM frame, the own apparatus abnormality determination unit 133a acquires information set in the RDI area and the LOC alarm detection target node identifier area of the CCM frame. Then, when the own device abnormality determination unit 133a is set to “1” in the acquired RDI region and the identifier of the own device is set in the LOC alarm detection target node identifier region, the own device abnormality determination unit 133a An RDI alarm is detected for the transmission apparatus 100b or 100c that has transmitted. When the device abnormality determination unit 133a detects an RDI alarm, the device abnormality determination unit 133a updates the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c that is the transmission source of the CCM frame to “RDI”. To do.

On the other hand, when “0” is set in the RDI area of the CCM frame, the own apparatus abnormality determination unit 133a does not detect the RDI alarm for the transmission apparatus 100b or 100c that is the transmission source of the CCM frame. At this time, the own device abnormality determination unit 133a acquires the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c that is the transmission source of the CCM frame, and the acquired abnormality detection status is “RDI”. If it is, the abnormality detection status is updated to “no abnormality”.

Further, even when “1” is set in the RDI area of the CCM frame, if the own apparatus identifier is not set in the LOC alarm detection target node identifier area, the own apparatus abnormality determination unit 133 a The RDI alarm is not detected for the transmission apparatus 100b or 100c that is the frame transmission source. At this time, the own device abnormality determination unit 133a acquires the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c that is the transmission source of the CCM frame, and the acquired abnormality detection status is “RDI”. If it is, the abnormality detection status is updated to “no abnormality”.

For example, when the CCM frame F102b illustrated in FIG. 1 is received, the own device abnormality determination unit 133a sets “1” in the RDI area of the received CCM frame F102b, but the LOC alarm detection target node identifier area. Since the identifier “A” of the own device is not set, no RDI alarm is detected for the transmission device 100b.

Further, the transmission apparatus 100b illustrated in FIG. 1 will be described as an example. When the transmission apparatus 100b receives the CCM frame F102a from the transmission apparatus 100a, the own apparatus abnormality determination unit 133b included in the transmission apparatus 100b “1” is set in the RDI area, but since the identifier “B” of the own apparatus is not set in the LOC alarm detection target node identifier area, the RDI alarm is not detected for the transmission apparatus 100a.

Further, the transmission apparatus 100c illustrated in FIG. 1 will be described as an example. When the transmission apparatus 100c receives the CCM frame F102a from the transmission apparatus 100a, the own apparatus abnormality determination unit 133c included in the transmission apparatus 100c has the CCM frame F102a. Since “1” is set in the RDI area and the identifier “C” of the own apparatus is set in the LOC alarm detection target node identifier area, an RDI alarm is detected for the transmission apparatus 100a. Then, the own device abnormality determination unit 133c updates the abnormality detection status of the abnormality detection status storage unit 120c corresponding to the transmission device identifier “A” to “RDI”.

Further, when the transmission apparatus 100c shown in FIG. 1 receives the CCM frame F102b from the transmission apparatus 100b, the own apparatus abnormality determination unit 133c is set to “1” in the RDI area of the CCM frame F102b. In addition, since the identifier “C” of the own device is set in the LOC alarm detection target node identifier area, the RDI alarm is detected for the transmission device 100b, and the abnormality detection status storage unit corresponding to the transmission device identifier “B” The abnormality detection status of 120c is updated to “RDI”.

The alarm notification unit 134a periodically notifies the network administrator that the LOC alarm or the RDI alarm is detected based on the information stored in the abnormality detection status storage unit 120a. The alarm notification unit 134a may perform a LOC alarm or RDI alarm notification process every time the device abnormality determination unit 133a receives a CCM frame.

Next, the LOC alarm detection process by the other apparatus abnormality determination unit 131a shown in FIG. 3 will be described. FIG. 5 is a flowchart showing a LOC alarm detection processing procedure by the other apparatus abnormality determination unit 131a shown in FIG.

As shown in the figure, when the other apparatus abnormality determination unit 131a has not received a CCM frame within a certain period from the transmission apparatus 100b or 100c (No in step S101), the LOC alarm is issued to the transmission apparatus 100b or 100c. Is detected. Then, the other device abnormality determination unit 131a updates the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c targeted for LOC alarm detection to “LOC” (step S102).

On the other hand, when a CCM frame is received from the transmission apparatus 100b or 100c within a certain period (Yes in step S101), the other apparatus abnormality determination unit 131a corresponds to the identifier of the transmission apparatus 100b or 100c that is the transmission source of the CCM frame. The abnormality detection status of the abnormality detection status storage unit 120a is acquired. If the acquired abnormality detection status is “LOC” (Yes at Step S103), the other apparatus abnormality determination unit 131a updates the abnormality detection status from “LOC” to “No abnormality” (Step S104).

Next, CCM frame transmission processing by the CCM frame transmission unit 132a shown in FIG. 3 will be described. FIG. 6 is a flowchart illustrating a CCM frame transmission processing procedure by the CCM frame transmission unit 132a illustrated in FIG. This processing procedure is periodically executed by the CCM frame transmission unit 132a.

As shown in the figure, the CCM frame transmission unit 132a acquires all information stored in the abnormality detection status of the abnormality detection status storage unit 120a (step S201). If “LOC” exists in the acquired abnormality detection status (Yes at Step S202), the CCM frame transmission unit 132a sets “1” in the RDI area of the CCM frame (Step S203), and sets the abnormality detection status. The transmission device identifier in which “LOC” is stored is set in the LOC alarm detection target node identifier region of the CCM frame (step S204). Then, the CCM frame transmission unit 132a transmits the generated CCM frame to the multicast address (step S205).

On the other hand, when “LOC” does not exist in the abnormality detection status acquired from the abnormality detection status storage unit 120a (No in step S202), the CCM frame transmission unit 132a sets “0” in the RDI area of the CCM frame, The frame is transmitted to the multicast address (step S205).

Next, the RDI alarm detection process by the own apparatus abnormality determination unit 133a shown in FIG. 3 will be described. FIG. 7 is a flowchart showing the RDI alarm detection processing procedure by the own apparatus abnormality determination unit 133a shown in FIG.

As shown in the figure, when the own device abnormality determination unit 133a receives a CCM frame (Yes in step S301), the device abnormality determination unit 133a acquires information set in the RDI region and the LOC alarm detection target node identifier region of the CCM frame. (Step S302).

If “1” is set in the acquired RDI area (Yes at Step S303) and the identifier of the own apparatus is set in the LOC alarm detection target node identifier area (Yes at Step S304), the own apparatus is abnormal. The determination unit 133a detects an RDI alarm for the transmission apparatus 100b or 100c that has transmitted the CCM frame. Then, the own device abnormality determination unit 133a updates the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c that is the transmission source of the CCM frame to “RDI” (step S305).

On the other hand, when “0” is set in the RDI area of the CCM frame (No in step S303), the own apparatus abnormality determination unit 133a detects the abnormality detection state corresponding to the identifier of the transmission apparatus 100b or 100c that is the transmission source of the CCM frame. The abnormality detection status of the storage unit 120a is acquired, and when the acquired abnormality detection status is “RDI” (Yes in step S306), the abnormality detection status is updated to “no abnormality” (step S307).

Even if “1” is set in the RDI area of the CCM frame (Yes at Step S303), the identifier of the own device is not set in the LOC alarm detection target node identifier area (No at Step S304). The own device abnormality determination unit 133a acquires the abnormality detection status of the abnormality detection status storage unit 120a corresponding to the identifier of the transmission device 100b or 100c that is the transmission source of the CCM frame, and the acquired abnormality detection status is “RDI”. If so (Yes at step S306), the abnormality detection status is updated to "no abnormality" (step S307).

As described above, when the transmission apparatuses 100a to 100c according to the first embodiment detect the LOC alarm for the other transmission apparatuses 100a to 100c, the CCM frame transmission unit 132a sets “1” in the RDI area. ”And a CCM frame in which the identifiers of the LOC alarm detection target transmission apparatuses 100a to 100c are set in the LOC alarm detection target node identifier area, and“ 1 ”is transmitted from the other transmission apparatuses 100a to 100c to the RDI area. Is set, and when the CCM frame in which the identifier of the own device is set in the LOC alarm detection target node identifier area is received, the own device abnormality determination unit 133a transmits the transmission device of the source of the CCM frame. Network is configured with multipoint connection Even if it is possible to accurately detect the RDI alarm. As a result, even when the network is configured by multipoint connection, the RDI alarm detection function can be enabled, and as a result, an abnormality can be detected in the CCM frame reception side transmission device and transmission side transmission device. Therefore, the maintainability of the network can be improved.

In the first embodiment, an example is shown in which the reserve area R10 in the conventional CCM frame shown in FIG. 16 is used as the LOC alarm detection target node identifier area. However, in the conventional CCM frame shown in FIG. "0 fixed areas R21 to R25, which are areas where" "is fixedly set, may also be used as the LOC alarm detection target node identifier area. Therefore, in the second embodiment, an example in which the reserved area R10 and the zero fixed areas R21 to R25 are used as the LOC alarm detection target node identifier area will be described.

FIG. 8 shows an example of the format of the CCM frame transmitted by the transmission apparatus according to the second embodiment. As indicated by hatching in the figure, the transmission apparatus according to the second embodiment uses the reserved area R10 and the 0 fixed areas R21 to R25 in the conventional CCM frame shown in FIG. 16 as the LOC alarm detection target node identifier area. Use. Thereby, a maximum of 10 identifiers can be set in the LOC alarm detection target node identifier region.

An application example of the transmission apparatus according to the second embodiment will be described with reference to FIG. FIG. 9 is a diagram for explaining an application example of the transmission apparatus according to the second embodiment. The L2VPN network shown in the figure is configured by multipoint connection of transmission apparatuses 200a to 200m according to the second embodiment. The configurations of the transmission devices 200a to 200m are the same as the configuration of the transmission device 100a shown in FIG.

The L2VPN network shown in the figure shows a state in which the transmission apparatuses 200a to 200j cannot transmit CCM frames to other transmission apparatuses due to an abnormality or the like, and the transmission apparatuses 200k to 200m can normally transmit CCM frames. ing.

In such a case, the transmission device 200k detects a LOC alarm for the transmission devices 200a to 200j. Then, the transmission apparatus 200k multicasts the CCM frame in which “1” is set in the RDI area and the identifiers of the transmission apparatuses 200a to 200j are set in the 10 LOC alarm detection target node identifier areas illustrated in FIG. Send to address.

The transmission apparatus 200a that has received this CCM frame has “1” set in the RDI area and the identifier of the own apparatus is set in the LOC alarm detection target node identifier area. Detect RDI alarms. Similarly, the transmission devices 200b to 200j also detect an RDI alarm for the transmission device 200k.

On the other hand, the transmission apparatuses 200l and 200m do not detect the RDI alarm for the transmission apparatus 200k because the identifier of the own apparatus is not set in the LOC alarm detection target node identifier area.

Similarly, the transmission apparatuses 200l and 200m detect LOC alarms for the transmission apparatuses 200a to 200j, set “1” in the RDI area, and set the transmission apparatus 200a to 200m in the LOC alarm detection target node identifier area. A CCM frame in which an identifier of 200j is set is transmitted to the multicast address. Then, the transmission devices 200a to 200j detect the RDI alarm for the transmission devices 200l and 200m.

Here, an example of the abnormality detection status storage unit 220a included in the transmission apparatus 200a illustrated in FIG. 9 is illustrated in FIG. As shown in the figure, the transmission device 200a detects a LOC alarm for the transmission devices 200b to 200j and detects an RDI alarm for the transmission devices 200k to 200m in the abnormality detection status storage unit 220a. Hold.

FIG. 10-2 shows an example of the abnormality detection status storage unit 220k of 200k shown in FIG. As shown in the figure, the transmission device 200k detects a LOC alarm for the transmission devices 200a to 200j, and detects an abnormality when neither the LOC alarm nor the RDI alarm is detected for the transmission devices 200l and 200m. It is stored in the status storage unit 220k.

As described above, since the transmission apparatuses 200a to 200m according to the second embodiment have 10 LOC alarm detection target node identifier areas in the CCM frame, it is possible to accurately detect an RDI alarm and Even when the LOC alarm is detected for the transmission apparatus, the identifier of the transmission apparatus targeted for the LOC alarm detection can be set in the CCM frame. The transmission apparatuses 200a to 200m according to the second embodiment may be applied when configuring a network that may detect a LOC alarm simultaneously for a plurality of transmission apparatuses because the reliability of the transmission apparatuses is low. it can.

In the first embodiment, the example in which the reserved area R10 in the conventional CCM frame shown in FIG. 16 is used as the LOC alarm detection target node identifier area is shown. However, the conventional CCM frame shown in FIG. Thus, the expanded area may be used as the LOC alarm detection target node identifier area. Thus, in the third embodiment, an example in which the extension region of the CCM frame is used as the LOC alarm detection target node identifier region will be described.

FIG. 11 shows an example of the format of the CCM frame transmitted by the transmission apparatus according to the third embodiment. As shown in the figure, the CCM frame transmitted by the transmission apparatus according to the third embodiment is newly provided with an extension region R30, which is a variable region, compared to the conventional CCM frame. The extended area R30 includes a LOC alarm detection target node number area and a plurality of LOC alarm detection target node identifier areas.

And the transmission apparatus which concerns on Example 3 changes the magnitude | size of this expansion area | region R30 based on the number of the transmission apparatuses which are detecting the LOC alarm. For example, when LOC alarms are detected for three transmission apparatuses, the transmission apparatus according to the third embodiment generates a CCM frame in which three LOC alarm detection target node identifier areas can be set. The transmission apparatus according to the third embodiment sets “3” in the LOC alarm detection target node number area and sets identifiers of the LOC alarm detection target transmission apparatuses in the three LOC alarm detection target node identifier areas. .

An application example of the transmission apparatus according to the third embodiment will be described with reference to FIG. FIG. 12 is a diagram for explaining an application example of the transmission apparatus according to the third embodiment. The L2VPN network shown in the figure is configured by multipoint connection of transmission apparatuses 300a to 300m according to the third embodiment. Note that the configurations of the transmission apparatuses 300a to 300m are the same as the configuration of the transmission apparatus 100a shown in FIG.

The L2VPN network shown in the figure shows a state in which the transmission apparatuses 300a to 300l cannot transmit the CCM frame to other transmission apparatuses due to an abnormality or the like, and the transmission apparatus 300m can normally transmit the CCM frame. .

In such a case, the transmission device 300m detects a LOC alarm for the 12 transmission devices 300a to 300l. Then, the transmission apparatus 300m generates a CCM frame in which 12 LOC alarm detection target node identifier areas can be set, like the CCM frame shown in FIG. Then, the transmission apparatus 300m sets “1” in the RDI area, sets “12” in the LOC alarm detection target node number area, and sets the transmission apparatus 300a to 300l in the 12 LOC alarm detection target node identifier areas. The CCM frame in which the identifier is set is transmitted to the multicast address.

The transmission apparatus 300a that has received this CCM frame has “1” set in the RDI area and the identifier of the own apparatus is set in the LOC alarm detection target node identifier area. Detect RDI alarms. Similarly, the transmission apparatuses 300b to 300l also detect an RDI alarm for the transmission apparatus 300m.

Here, an example of the abnormality detection status storage unit 320a included in the transmission apparatus 300a illustrated in FIG. 12 is illustrated in FIG. As shown in the figure, the transmission apparatus 300a detects the LOC alarm for the transmission apparatuses 300b to 300l and holds the state in which the RDI alarm is detected for the transmission apparatus 300m in the abnormality detection status storage unit 320a. .

FIG. 13-2 shows an example of the abnormality detection status storage unit 320m included in 300m shown in FIG. As shown in the figure, the transmission device 300m holds the state where the LOC alarm is detected for the transmission devices 300a to 300l in the abnormality detection status storage unit 320m.

As described above, the transmission apparatuses 300a to 300m according to the third embodiment provide the extended region R30 in the CCM frame, and the number of LOC alarm detection target node identifier areas based on the number of LOC alarm detection target transmission apparatuses. Therefore, the RDI alarm can be accurately detected, and the identifier of the transmission device targeted for LOC alarm detection can be set in the CCM frame regardless of the number of transmission devices constituting the network.

Note that the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above document and drawings can be arbitrarily changed unless otherwise specified. Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. That is, the specific form of distribution and integration of each device is not limited to the one shown in the figure, and all or a part thereof is functionally or physically distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed in each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware by wired logic.

In the first to third embodiments, the case where various processes are realized by hardware logic has been described. However, the present invention is not limited to this, and a program prepared in advance is executed by a computer. It may be realized. Therefore, hereinafter, an example of a computer that executes a continuity confirmation program having the same function as that of the control unit 130a included in the transmission apparatus 100a illustrated in FIG. 3 will be described.

FIG. 14 is a block diagram illustrating a configuration of the transmission apparatus 1000 that executes the continuity confirmation program 1041. As shown in the figure, a transmission apparatus 1000 includes a CPU (Central Processing Unit) 1010 that executes various arithmetic processes, a network interface 1020 that exchanges data with other transmission apparatuses via a network, A RAM (Random Access Memory) 1030 for temporarily storing information and a ROM (Read Only Memory) 1040 are connected by a bus 1050 or the like. FIG. 14 shows only components necessary for executing the continuity confirmation program 1041.

The ROM 1040 stores a continuity confirmation program 1041 having the same function as the control unit 130a shown in FIG. Note that the continuity confirmation program 1041 may be separated as appropriate, as with each component of the control unit 130a shown in FIG. For example, the continuity confirmation program 1041 is set to the other device abnormality determination program corresponding to the other device abnormality determination unit 131a, the CCM frame transmission program corresponding to the CCM frame transmission unit 132a, and the own device corresponding to the own device abnormality determination unit 133a. You may isolate | separate into an abnormality determination program and the alarm notification program corresponding to the alarm notification part 134a.

Then, the CPU 1010 reads out the continuity confirmation program 1041 from the ROM 1040 and develops it in the RAM 1030, so that the continuity confirmation program 1041 functions as the continuity confirmation process 1031.

The continuity confirmation process 1031 executes various data processing based on the abnormality detection status data 1032 stored in the RAM 1030. This abnormality detection status data 1032 corresponds to the abnormality detection status storage unit 120a shown in FIG.

Note that the continuity confirmation program 1041 is not necessarily stored in the ROM 1040, and the transmission apparatus 1000 may read and execute this program stored in a storage medium such as a CD-ROM. In addition, this program is stored in another computer (or server) connected to the transmission apparatus 1000 via a public line, the Internet, a LAN (Local Area Network), a WAN (Wide Area Network), etc. 1000 may read the program from these and execute it.

Claims (16)

1. A transmission device that periodically transmits / receives a confirmation frame for confirming continuity with another transmission device to / from another transmission device,
   Other device abnormality determination means for determining that an abnormality has occurred in the transmission device when a confirmation frame is not received for a certain period from one of the other transmission devices;
   Confirmation frame in which identification information for identifying an abnormal transmission device which is a transmission device determined to be abnormal by the other device abnormality determination means and abnormality detection information indicating that an abnormality has been detected are set Confirmation frame transmitting means for transmitting to the other transmission device;
   When identification information of the transmission device and abnormality detection information are set in the confirmation frame received from the other transmission device, the transmission device that is the transmission device of the confirmation frame transmits the identification information. A transmission apparatus comprising: an own apparatus abnormality determination unit that determines that an abnormality has occurred in the transmission apparatus.
2. The other apparatus abnormality determination means does not receive a CCM (Continuity Check Message) frame conforming to Ethernet (registered trademark) -OAM (Ethernet-Operations Administration Maintenance) as a confirmation frame from one of the other transmission apparatuses for a certain period of time. If it is determined that an abnormality has occurred in the transmission device,
   The confirmation frame transmitting means transmits a CCM frame in which the identification information of the abnormality occurrence transmission device and the abnormality detection information are set to the other transmission device,
   The own device abnormality determining means, when identification information and abnormality detection information of the transmission device is set in the CCM frame received from the other transmission device, the transmission source transmission device of the CCM frame. The transmission apparatus according to claim 1, wherein it is determined that an abnormality has occurred in the transmission apparatus.
3. The transmission apparatus according to claim 1 or 2, wherein the confirmation frame transmission means sets identification information of the abnormality occurrence transmission apparatus in a reserved area that is an unused area in the confirmation frame.
4. The said confirmation frame transmission means sets the identification information of the said abnormality transmission apparatus in the 0 fixed area | region which is an area | region which sets 0 fixedly in the said confirmation frame, The Claim 1 or 2 characterized by the above-mentioned. Transmission equipment.
5. The transmission apparatus according to claim 1 or 2, wherein the confirmation frame transmission unit sets identification information of the abnormality occurrence transmission apparatus in an extended area that is an area obtained by extending the confirmation frame.
6. In association with the identification information of the other transmission device, further comprising an abnormality detection status storage means for storing an abnormality detection status indicating the status of the abnormality detected for the other transmission device,
   When the other apparatus abnormality determination means determines that an abnormality has occurred in the abnormality occurrence transmission apparatus, the abnormality detection situation of the abnormality detection situation storage means corresponding to the identification information of the abnormality occurrence transmission apparatus is Update to other device error information indicating that an error has occurred in the error transmission device,
   The confirmation frame transmission unit sets identification information of all transmission devices in which other device abnormality information is stored in the abnormality detection status of the abnormality detection status storage unit in the confirmation frame,
   When the own device abnormality determining means determines that an abnormality has occurred in the transmission device by the transmission source transmission device, the abnormality corresponding to the identification information of the transmission source device The abnormality detection status of the detection status storage means is updated to own device abnormality information indicating that an abnormality has occurred in the transmission device by the transmission source transmission device. The transmission apparatus according to 1 or 2.
7. It is a continuity confirmation method in a transmission device that periodically transmits and receives a confirmation frame for confirming continuity with another transmission device between other transmission devices,
   The transmission apparatus is
   When a confirmation frame is not received for a certain period from one of the other transmission devices, another device abnormality determination step for determining that an abnormality has occurred in the transmission device;
   Confirmation frame in which identification information for identifying an abnormal transmission device that is a transmission device determined to have an abnormality in the other device abnormality determination step and abnormality detection information indicating that an abnormality has been detected are set. Transmitting a confirmation frame to the other transmission device; and
   When identification information of the transmission device and abnormality detection information are set in the confirmation frame received from the other transmission device, the transmission device that is the transmission device of the confirmation frame transmits the identification information. And a self-device abnormality determination step for determining that an abnormality has occurred in the transmission device.
8. In the other apparatus abnormality determination step, when a CCM frame conforming to Ethernet (registered trademark) -OAM is not received as a confirmation frame from one of the other transmission apparatuses for a certain period, an abnormality occurs in the transmission apparatus. It is determined that
   The confirmation frame transmission step transmits a CCM frame in which the identification information of the abnormality occurrence transmission device and the abnormality detection information are set to the other transmission device,
   The own apparatus abnormality determination step is performed by the transmission apparatus of the CCM frame when the identification information and the abnormality detection information of the transmission apparatus are set in the CCM frame received from the other transmission apparatus. The continuity confirmation method according to claim 7, wherein it is determined that an abnormality has occurred in the transmission apparatus.
9. The continuity confirmation method according to claim 7 or 8, wherein in the confirmation frame transmission step, identification information of the abnormality occurrence transmission device is set in a reserved area which is an unused area in the confirmation frame.
10. The said confirmation frame transmission process sets the identification information of the said abnormality occurrence transmission apparatus in the 0 fixed area | region which is an area | region which sets 0 fixedly in the said confirmation frame, It is characterized by the above-mentioned. Conductivity confirmation method.
11. The continuity confirmation method according to claim 7 or 8, wherein in the confirmation frame transmission step, the identification information of the abnormality occurrence transmission device is set in an extended area which is an area obtained by extending the confirmation frame.
12. A continuity confirmation program for causing a computer to execute a continuity confirmation method in a transmission apparatus that periodically transmits / receives a confirmation frame for confirming continuity with another transmission apparatus to / from another transmission apparatus. ,
    Another apparatus abnormality determination procedure for determining that an abnormality has occurred in the transmission apparatus when a confirmation frame is not received for a certain period from one of the other transmission apparatuses;
    Confirmation frame in which identification information for identifying an abnormal transmission device which is a transmission device determined to have an abnormality by the other device abnormality determination procedure and abnormality detection information indicating that an abnormality has been detected are set. A confirmation frame transmission procedure for transmitting to the other transmission device;
    When identification information of the transmission device and abnormality detection information are set in the confirmation frame received from the other transmission device, the transmission device that is the transmission device of the confirmation frame transmits the identification information. A continuity confirmation program for causing a computer to execute a self-device abnormality determination procedure for determining that an abnormality has occurred in the transmission device.
13. The other apparatus abnormality determination procedure is performed when an abnormality occurs in the transmission apparatus when a CCM frame conforming to Ethernet (registered trademark) -OAM is not received as a confirmation frame from one of the other transmission apparatuses for a certain period. It is determined that
    The confirmation frame transmission procedure transmits a CCM frame in which the identification information of the abnormality occurrence transmission device and the abnormality detection information are set to the other transmission device,
    The own device abnormality determination procedure is performed by the transmission device of the CCM frame when the identification information and abnormality detection information of the transmission device are set in the CCM frame received from the other transmission device. 13. The continuity confirmation program according to claim 12, wherein it is determined that an abnormality has occurred in the transmission apparatus.
14. The continuity confirmation program according to claim 12 or 13, wherein the confirmation frame transmission procedure sets identification information of the abnormality occurrence transmission apparatus in a reserved area that is an unused area in the confirmation frame.
15. The said confirmation frame transmission procedure sets the identification information of the said abnormality occurrence transmission apparatus in the 0 fixed area | region which is an area | region which sets 0 fixedly in the said confirmation frame, It is characterized by the above-mentioned. Continuity confirmation program.
16. The continuity confirmation program according to claim 12 or 13, wherein the confirmation frame transmission procedure sets identification information of the abnormality-occurring transmission apparatus in an extended area which is an area obtained by extending the confirmation frame.

Images