JP2018006835A - Transmission device and diagnosis method for transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission device which shortens the time required for identifying a failure cause, and a diagnosis method for the transmission device.SOLUTION: A transmission device comprises: a first unit for receiving a frame; and a second unit for transmitting the frame that is received by the first unit. The first unit includes: a first storage part for storing first disposal information relating to the frame that is disposed in the first unit; a generation part for generating a dummy frame; a first application part for applying the first disposal information to the dummy frame; and an output part for outputting the dummy frame to which the first disposal information is applied, to the second unit. The second unit includes: a second storage part for storing second disposal information relating to the frame that is disposed in the second unit; and a diagnosis part for diagnosing a failure based on the first disposal information that is applied to the dummy frame, and the second disposal information.SELECTED DRAWING: Figure 7

Description

  The present case relates to a transmission apparatus and a diagnosis method for the transmission apparatus.

  For example, a transmission device that transmits an Ethernet (registered trademark, the same shall apply hereinafter) statistics such as the number of discarded Ethernet frames and the duration of discarding in order to analyze the cause when a failure such as a failure occurs. Collect information for each communication line. For example, Patent Documents 1 and 2 describe that a test frame is used for monitoring an apparatus.

JP 2001-216205 A Japanese Patent Laid-Open No. 2014-23048

  As the communication band increases, the number of communication lines accommodated in one transmission apparatus increases. For this reason, there is a problem that the transmission apparatus increases the processing load due to an increase in statistical information collected when an alarm occurs, and it takes a long time to identify the cause of the failure.

  It is an object of the present invention to provide a transmission apparatus and a transmission apparatus diagnosis method in which a specific time required for a failure cause is shortened.

  In one aspect, the transmission apparatus includes a first unit that receives a frame, and a second unit that transmits the frame received by the first unit, wherein the first unit is A first storage unit that stores first discard information related to the discarded frame; a generation unit that generates a dummy frame; a first grant unit that assigns the first discard information to the dummy frame; and the first discard unit. An output unit for outputting the dummy frame to which the information is added to the second unit, wherein the second unit stores second discard information relating to the frame discarded in the second unit. And a diagnosis unit for diagnosing a failure based on the first discard information and the second discard information given to the dummy frame.

  In one aspect, the transmission apparatus diagnosis method includes the first unit that receives a frame and the second unit that transmits the frame received by the first unit. The unit generates a dummy frame, assigns to the dummy frame first discard information related to the frame discarded in the first unit, and sets the dummy frame to which the first discard information is added to the second unit. And the second unit diagnoses a fault based on the first discard information given to the dummy frame and the second discard information regarding the frame discarded in the second unit.

  As one aspect, the specific time required for the cause of the failure can be shortened.

It is a block diagram which shows an example of a layer 2 switch. It is a figure which shows an example of statistical information. It is a figure which shows an example of a user frame and a test frame. It is a block diagram which shows an example of the network processing part and traffic processing part of an input side. It is a block diagram which shows an example of the traffic processing part on the output side. It is a block diagram which shows an example of the network processing part on the output side. It is a figure which shows an example of the flow of a test frame. It is a figure which shows the discard information for every test frame. It is a flowchart which shows an example of the diagnostic method of a layer 2 switch. It is a flowchart which shows an example of a failure diagnosis process. It is a flowchart which shows the maintenance procedure of a comparative example. It is a flowchart which shows the maintenance procedure of an Example.

  FIG. 1 is a configuration diagram illustrating an example of a layer 2 switch. The layer 2 switch is an example of a transmission apparatus, and includes a plurality of interface (IF) units (# 1 to #N) 1, a switch (SW) unit 2, and a monitoring control unit 3.

  The IF unit 1, the SW unit 2, and the monitoring control unit 3 are configured by, for example, a circuit board on which a plurality of electrical components are mounted, and are mounted in a slot provided in the case of the layer 2 switch. The IF unit 1, the SW unit 2, and the monitoring control unit 3 are connected to a wiring board provided in the layer 2 switch via an electrical connector or the like, and input / output data to / from each other via the wiring board.

  The IF unit 1 is connected to another device via a transmission path, and transmits / receives a user frame UF to / from another device. The IF unit 1 includes a plurality of ports P1 to Pn (n: a positive integer), network (NW) processing units 10 and 12, traffic processing units 11 and 13, and a control unit 14.

  Ports P1 to Pn are provided for each communication line, and transmit and receive user frames UF to and from other devices. The ports P1 to Pn are provided with an optical transceiver that transmits a user frame by performing electrical-optical conversion, an optical receiver that receives an optical signal by optical-electrical conversion, and the like. The ports P1 to Pn output the received user frame UF to the NW processing unit 10 and transmit the user frame UF input from the NW processing unit 12.

  The NW processing unit 10 and the traffic processing unit 11 process the user frame UF input from the ports P1 to Pn. The NW processing unit 12 and the traffic processing unit 13 process the user frame UF output to the ports P1 to Pn.

  The NW processing units 10 and 12 are composed of, for example, a network processor, and perform a destination determination process for the user frame UF. The traffic processing units 11 and 13 are composed of, for example, an FPGA (Field Programmable Gate Array) or the like, and perform bandwidth processing of the user frame UF and the like.

  The control unit 14 includes, for example, a CPU (Central Processing Unit) circuit, an FPGA, and a CPLD (Complex Programmable Logic Device), and controls the NW processing units 10 and 12 and the traffic processing units 11 and 13. The control unit 14 communicates with the monitoring control unit 3 and performs various setting processes on the NW processing units 10 and 12 and the traffic processing units 11 and 13 according to the instructions.

  The supervisory control unit 3 performs supervisory control of each IF unit 1 and SW unit 2. The monitoring control unit 3 collects information such as alarms from each IF unit 1 and SW unit 2.

  The SW unit 2 exchanges user frames UF between the IF units 1. The SW unit 2 transfers the user frame UF input from the IF unit 1 to the IF unit 1 corresponding to the destination.

  For example, as indicated by the dotted line, the user frame UF received at the port P1 of the IF unit (# 1) 1 is output to the IF unit (# 2) 1 via the SW unit 2 and is then sent to the IF unit (# 2 ) 1 is transmitted from port P1. In this example, the IF unit (# 1) 1 functions as a first unit that receives the user frame UF, and the IF unit (# 2) 1 transmits a user frame UF received by the first unit. Functions as a unit. The user frame UF is an example of a frame.

  The user frame UF passes through the port P1, the NW processing unit 10, and the traffic processing unit 11 in the IF unit (# 1) 1 in this order, and is output to the SW unit 2. The SW unit 2 outputs the user frame UF to the IF unit (# 2) 1 according to the destination. In the IF unit (# 2) 1, the user frame UF is transmitted through the traffic processing unit 13, the NW processing unit 12, and the port P1 in this order.

  The NW processing units 10 and 12 and the traffic processing units 11 and 13 monitor statistical information including the number of passing user frames UF and the number of discards at a plurality of monitoring points.

  FIG. 2 is a diagram illustrating an example of statistical information. FIG. 2 shows statistical information of the NW processing units 10 and 12 as an example. The statistical information includes counter values counted by a plurality of counters.

  In FIG. 2, “counter name” indicates the name of the counter, and “content” indicates the content of the counter value. “Direction” indicates the direction in which the user frame UF to be counted flows. When “direction” is “transmission”, the counter value is in the transmission direction of the NW processing units 10 and 12, and when “direction” is “reception”, the counter value is the NW processing units 10 and 12. In the receiving direction. The “granting target” will be described later.

  “CV-PHY” indicates the number of errors in 8B / 10B code conversion, and “ES-PHY” indicates the occurrence time (seconds) of the error. “SES-PHY” indicates a cumulative time (seconds) in a short inoperable state, and “UAS-PHY” indicates a cumulative time (seconds) in a long inoperable state. Note that the inoperable state refers to a state in which, for example, LOS indicating signal loss of the user frame UF, LOSSSYNC indicating loss of signal synchronization, and SF indicating deterioration of the signal error rate have occurred.

  “CV-L” indicates the total sum of “FCSE-L”, “OSIZE-L” (reception direction), and “USIZE-L”, which will be described later. “ES-L” indicates the occurrence time (seconds) of “CV-L”. “FR-L” indicates the number of normal user frames UF in each of the transmission direction and the reception direction.

  “FCSE-L” indicates the number of user frames UF having an abnormal FCS (Frame Check Sequence). “OSIZE-L” indicates the number of user frames UF in which the data size in each of the transmission direction and the reception direction is larger than a predetermined value. “USIZE-L” indicates the number of user frames UF whose data size is smaller than a predetermined value.

  Thus, the NW processing units 10 and 12 monitor a lot of statistical information about the user frame UF. The same applies to the traffic processing units 11 and 13. Each counter is provided for each of the ports P1 to Pn.

  Referring to FIG. 1 again, for example, the monitoring control unit 3 analyzes statistical information from the monitoring points of the NW processing units 10 and 12 and the traffic processing units 11 and 13 in order to analyze the cause when a failure occurs. Assume that you collect. In this case, as the number of IF units 1, that is, the number of communication lines increases, the load of collecting statistical information in the monitoring control unit 3 increases, so that it takes much time to identify the cause of the failure.

  Therefore, in the layer 2 switch of the embodiment, the NW processing unit 10 of the IF unit (# 1) 1 on the input side generates the test frame TF and follows the same path as the user frame UF as shown by the one-dot chain line. Output. The test frame TF is provided with discard information such as the number of discards related to the identification of the cause of failure among the statistical information at each monitoring point of the NW processing units 10 and 12 and the traffic processing units 11 and 13 on the route. The

  The discard information is extracted from the test frame TF by the output side NW processing unit 12 and used for the failure diagnosis process. As a result, the monitoring control unit 3 can save the trouble of collecting statistical information from many monitoring points, so that the time required for identifying the cause of the failure can be shortened. Note that the test frame TF is discarded in the NW processing unit 12 on the output side. The test frame TF is an example of a dummy frame.

  FIG. 3 is a diagram illustrating an example of the user frame UF and the test frame TF. As an example, the user frame UF and the test frame TF have an Ethernet frame format structure. Note that the user frame UF and the test frame TF in this example are shown with an in-device header used in the layer 2 switch.

  The Ethernet frame includes each area of a device header, DA (Destination Address), SA (Source Address), TYPE, payload, and FCS (Frame Check Sequence). DA is the MAC (Media Access Control) address of the destination device, and SA is the MAC address of the source device. TYPE is a type of protocol such as IP (Internet Protocol). The payload is data such as a client signal. The FCS is a code for correcting a frame data error.

  The in-device header is an area given to the user frame UF in the layer 2 switch. The in-device header includes frame identification information for identifying the user frame UF, control information including destination information of the user frame UF, and the like.

  In addition, the test frame TF includes areas in the apparatus header, DA, SA, unit ID, port ID, a plurality of discard information (# 1 to #m (m: positive integer)), and FCS (Frame Check Sequence). including. The test frame TF is generated with the in-device header added. The in-device header includes frame identification information for identifying the test frame TF, control information including destination information of the test frame TF, and the like.

  A random value or a fixed value is set for DA and SA. In the unit ID, the identification number (# 1 to #N) of the IF unit 1 in which the test frame TF is generated is set. In the port ID, identification numbers (# 1 to #n) of the ports P1 to Pn corresponding to the discard information given to the test frame TF are set.

  The discard information is information on a count value related to the user frame UF that is inserted into the test frame TF for each monitoring point of the statistical information and discarded in the IF unit 1 among the statistical information. Each discard information includes the identification number (# 1, # 2,...) Of the monitoring point in which the discard information is inserted, the counter name, and the counter value. The counter name corresponds to the counter name shown in FIG. 2, and the counter value indicates the counter value counted by the counter.

  Thus, since the discard information of each monitoring point on the route is given to the test frame TF, the monitoring control unit 3 can save time and effort for collecting statistical information from each monitoring point. The unit ID, the port ID, and the point ID are examples of position information indicating the position where the discard of the user frame UF has occurred. Next, the configuration of the IF unit 1 will be described.

  FIG. 4 is a configuration diagram illustrating an example of the NW processing unit 10 and the traffic processing unit 11 on the input side. The NW processing unit 10 includes an input frame processing unit 100 and an input address table 106. The input frame processing unit 100 includes a header generation unit 101, a statistical information processing unit 102, a frame generation unit 103, a discard information addition unit 104, and a multiplexing unit 105.

  The input frame processing unit 100 specifies the IF unit 1 corresponding to the destination of the user frame UF based on the input address table 106. In the input address table 106, the correspondence between the MAC address (DA) learned by the MAC address learning and the IF unit 1 is registered.

  The header generation unit 101 adds an in-device header to the user frame UF. The user frame UF to which the in-device header is added is output to the statistical information processing unit 102.

  The statistical information processing unit 102 is one of the monitoring points of the statistical information. When the user frame UF passes, the statistical information processing unit 102 counts the statistical information of the user frame UF and stores it in a memory or the like in the statistical information processing unit 102. The statistical information processing unit 102 functions as a first storage unit that stores discard information regarding the user frame UF discarded in the IF unit 1 on the input side of the user frame UF (IF unit (# 1) 1 in the example of FIG. 1). To do. The statistical information processing unit 102 outputs the user frame UF to the multiplexing unit 105.

  The frame generation unit 103 is an example of a generation unit, and generates a test frame TF. The test frame TF is generated with the in-device header attached. In addition, the frame generation unit 103 assigns the identification number of the IF unit 1 provided with the frame generation unit 103 as a unit ID, and selects one of the ports P1 to Pn to which the user frame UF is input. The identification numbers of the ports P1 to Pn are assigned as port IDs. The frame generation unit 103 outputs the generated test frame TF to the discard information adding unit 104. Note that the test frame TF is generated, for example, at a time interval (for example, 100 (ms) or less) sufficient for detection of an alarm or alert described later.

  When the test frame TF is input, the discard information adding unit 104 acquires, from the statistical information processing unit 102, the discard information related to the user frame UF discarded in the NW processing unit 10 from the statistical information, and the test frame TF To grant. More specifically, the discard information adding unit 104 acquires the statistical information corresponding to the port ID of the test frame TF and indicating that “granting target” is “O” among the statistical information illustrated in FIG. The counter name and the counter value corresponding to the statistical information are added to the test frame TF as discard information.

  The statistical information in which “granting target” indicates “o” corresponds to discard information, and is used for failure diagnosis processing. On the other hand, the statistical information in which “granting target” indicates “x” does not correspond to the discard information and is not used in the failure diagnosis process.

  As described above, the discard information adding unit 104 functions as an example of a first adding unit that adds discard information to the test frame TF. In addition, the discard information assigning unit 104 assigns a point ID corresponding to the statistical information processing unit 102 to the test frame TF. The discard information adding unit 104 outputs the test frame TF to which the discard information is added to the multiplexing unit 105.

  The multiplexing unit 105 time-division-multiplexes the user frame UF input from the statistical information processing unit 102 and the test frame TF input from the discard information adding unit 104 and outputs the result to the traffic processing unit 11.

  The traffic processing unit 11 controls the bandwidth of the user frame UF output to the SW unit 2. The traffic processing unit 11 includes a distribution unit 110, a statistical information processing unit 111, a discard information adding unit 112, and a multiplexing unit 113.

  The distribution unit 110 distributes the user frame UF and the test frame TF input from the NW processing unit 10 to the statistical information processing unit 111 and the discard information adding unit 112, respectively. As a result, the user information frame UF is input to the statistical information processing unit 111, and the test frame TF is input to the discard information adding unit 112. The sorting unit 110 identifies the user frame UF and the test frame TF based on the identification information in the in-device header.

  The statistical information processing unit 111 is one of the monitoring points of the statistical information, and counts the statistical information in the traffic processing unit 11 when the user frame UF passes, like the statistical information processing unit 102. The statistical information processing unit 111 functions as a first storage unit that stores discard information regarding the user frame UF discarded in the IF unit 1 on the input side of the user frame UF. The statistical information processing unit 111 outputs the user frame UF to the multiplexing unit 113.

  Similar to the discard information adding unit 104, the discard information adding unit 112 acquires, from the statistical information processing unit 111, the discard information related to the user frame UF discarded in the traffic processing unit 11 from the statistical information, and the test frame TF. To grant. More specifically, the discard information adding unit 112 adds a counter name and a counter value corresponding to the port ID of the test frame TF to the test frame TF. As described above, the discard information adding unit 112 functions as an example of a first adding unit that adds discard information to the test frame TF.

  In addition, the discard information assigning unit 112 assigns a point ID corresponding to the statistical information processing unit 111 to the test frame TF. The discard information adding unit 112 outputs the test frame TF to which the discard information is added to the multiplexing unit 113.

  The multiplexing unit 113 time-division-multiplexes the user frame UF input from the statistical information processing unit 102 and the test frame TF input from the discard information adding unit 104 and outputs the result to the SW unit 2. The SW unit 2 outputs the test frame TF to the IF unit 1 corresponding to the unit ID and the port ID.

  As described above, the multiplexing unit 113 functions as an output unit that outputs the test frame TF to which the discard information is added to the IF unit 1 on the output side. The discard information stored in the statistical information processing units 102 and 111 in the input IF unit 1 is an example of first discard information.

  FIG. 5 is a configuration diagram illustrating an example of the output-side traffic processing unit 13. The traffic processing unit 13 controls the bandwidth of the user frame UF input from the SW unit 2 to the output IF unit 1.

  The traffic processing unit 13 includes a distribution unit 130, a plurality of flow queues 131a to 131d, selectors 132 and 134, a plurality of port queues 133a and 133b, a statistical information processing unit 135, a discard information adding unit 136, a multiplexing Part 137. The distribution unit 130 inputs the user frame UF input from the IF unit 1 on the input side to the flow queues 131a to 131d corresponding to the priority of the flow. Here, the flow is determined based on a combination of DA and SA of the user frame UF, for example. In addition, the distribution unit 130 inputs the test frame TF to a predetermined flow queue among the flow queues 131a to 131d.

  The flow queues 131a to 131d store the user frame UF and the test frame TF in the order of input. Among the flow queues 131a to 131d, the flow queue 131a has the highest priority, and the flow queue 131d has the lowest priority.

  The distribution unit 130 distributes the user frame UF to the flow queues 131a to 131d according to the priority of the flow. Also, the distribution unit 130 inputs the test frame TF to, for example, the flow queue 131d having the lowest priority among the flow queues 131a to 131d. In this case, since the test frame TF is read with a priority lower than the priorities of the other flow queues 131a to 131c, the transmission delay of the user frame UF due to the processing of the test frame TF is reduced.

  The selector 132 reads the user frame UF and the test frame TF in each of the flow queues 131a to 131d according to a schedule based on the priority, for example, according to a weighted round robin method. The selector 132 inputs the user frame UF and the test frame TF to the port queues 133a and 133b according to the priority of the corresponding port.

  The port queues 133a and 133b store the user frame UF and the test frame TF in the order of input. The port queue 133a has a higher priority than the port queue 133b.

  The selector 132 inputs the user frame UF to the port queues 133a and 133b according to the priority of the ports P1 to Pn from which the user frame UF is received. The selector 132 acquires the identification numbers of the ports P1 to Pn from which the user frame UF has been received, for example, from the control information in the in-device header.

  The selector 132 inputs the test frame TF to one of the port queues 133a and 133b. When the test frame TF is input to the port queue 133b having a low priority, the test frame TF is read with a priority lower than that of the other port queue 133a, so that the transmission delay of the user frame UF due to the processing of the test frame TF is reduced. The

  The selector 134 reads out the user frame UF and the test frame TF in each of the port queues 133a and 133b according to a schedule based on the priority, for example, according to a weighted round robin method.

  The selector 132 distributes the user frame UF and the test frame TF read from the port queues 133a and 133b to the statistical information processing unit 135 and the discard information adding unit 136, respectively. As a result, the user information frame UF is input to the statistical information processing unit 135, and the test frame TF is input to the discard information adding unit 136. The selector 132 identifies the user frame UF and the test frame TF based on the identification information in the in-device header.

  The statistical information processing unit 135 is one of the monitoring points of statistical information. When the user frame UF passes, the statistical information processing unit 135 counts the statistical information of the user frame UF and stores it in a memory or the like in the statistical information processing unit 135. The statistical information processing unit 135 functions as a second storage unit that stores discard information regarding the user frame UF discarded in the IF unit 1 on the output side of the user frame UF (IF unit (# 2) 1 in the example of FIG. 1). To do. The statistical information processing unit 135 outputs the user frame UF to the multiplexing unit 137.

  When the test frame TF is input, the discard information adding unit 136 acquires, from the statistical information processing unit 135, discard information regarding the user frame UF discarded in the traffic processing unit 13 from the statistical information, and the test frame TF. To grant. More specifically, the discard information adding unit 136 adds a counter name and a counter value corresponding to the port ID of the test frame TF to the test frame TF. As described above, the discard information adding unit 136 functions as an example of a second adding unit that adds discard information to the test frame TF.

  Further, the discard information assigning unit 136 assigns a point ID corresponding to the statistical information processing unit 135 to the test frame TF. The discard information adding unit 136 outputs the test frame TF to which the discard information is added to the multiplexing unit 137.

  The multiplexing unit 137 time-division-multiplexes the user frame UF input from the statistical information processing unit 135 and the test frame TF input from the discard information adding unit 136 and outputs the result to the NW processing unit 12.

  FIG. 6 is a configuration diagram illustrating an example of the NW processing unit 12 on the output side. The NW processing unit 12 includes an output frame processing unit 120, an output address table 121, and a failure diagnosis unit 122. The output frame processing unit 120 includes a sorting unit 123, a statistical information processing unit 124, a header removing unit 125, a discard information adding unit 126, a discard information extracting unit 127, and a frame discarding unit 128.

  The output frame processing unit 120 identifies the ports P1 to Pn corresponding to the destination of the user frame UF based on the output address table 121. In the output address table 121, the correspondence between the MAC address (DA) learned by the MAC address learning and the ports P1 to Pn is registered.

  The distribution unit 123 distributes the user frame UF and the test frame TF input from the traffic processing unit 13 to the statistical information processing unit 124 and the discard information adding unit 126, respectively. As a result, the user information frame UF is input to the statistical information processing unit 124, and the test frame TF is input to the discard information adding unit 126. The distribution unit 123 identifies the user frame UF and the test frame TF based on the identification information of the in-device header.

  The statistical information processing unit 124 is one of the monitoring points of the statistical information, and counts the statistical information in the traffic processing unit 13 when the user frame UF passes, like the statistical information processing unit 135. The statistical information processing unit 124 functions as a second storage unit that stores discard information regarding the user frame UF discarded in the IF unit 1 on the output side of the user frame UF. The statistical information processing unit 124 outputs the user frame UF to the header removing unit 125.

  The header removing unit 125 removes the in-device header from the user frame UF. The user frame UF from which the in-device header is removed is transmitted via the ports P1 to Pn corresponding to the destination.

  Similar to the discard information adding unit 136, the discard information adding unit 126 acquires the discard information related to the user frame UF discarded in the NW processing unit 12 from the statistical information processing unit 124, and the test frame TF. To grant. More specifically, the discard information adding unit 126 adds a counter name and a counter value corresponding to the port ID of the test frame TF to the test frame TF. Thus, the discard information adding unit 126 functions as an example of a second adding unit that adds discard information to the test frame TF.

  Further, the discard information assigning unit 126 assigns a point ID corresponding to the statistical information processing unit 124 to the test frame TF. The discard information adding unit 126 outputs the test frame TF to which the discard information is added to the discard information extracting unit 127. The discard information stored in the statistical information processing units 135 and 124 in the IF unit 1 on the output side is an example of second discard information.

  The discard information extraction unit 127 extracts the discard information from the test frame TF and outputs it to the failure diagnosis unit 122. More specifically, the discard information extraction unit 127 acquires a unit ID, a port ID, and discard information (# 1 to #m) from the test frame TF, and outputs them to the failure diagnosis unit 122. The discard information extraction unit 127 outputs the test frame TF to the frame discard unit 128 after extracting the discard information.

  The frame discard unit 128 is an example of a discard unit, and discards the test frame TF. For this reason, the test frame TF is not transmitted from the layer 2 switch to another device.

  The failure diagnosing unit 122 is an example of a diagnosing unit, and diagnoses a failure based on the discard information of the input-side IF unit 1 and the discard information of the output-side IF unit 1 given to the test frame TF. As a result, the failure diagnosis unit 122 discards information about each IF unit 1 (IF unit (# 1) 1 and IF unit (# 2) 1 in the example of FIG. 1) on the input side and output side in the path of the user frame UF. Can be used to diagnose a fault at once.

  For this reason, the failure diagnosis unit 122 can easily diagnose a failure. Further, the supervisory control unit 3 can save the trouble of collecting the discard information from each IF unit 1. Therefore, according to the layer 2 switch of the embodiment, the specific time required for the cause of the failure can be shortened.

  In this embodiment, the discard information of all the monitoring points is added to the test frame TF. However, the present invention is not limited to this. For example, the failure diagnosis unit 122 may acquire the discard information directly from the statistical information processing unit 124, for example, as indicated by a dotted line. In this case, the discard information adding unit 126 does not need to acquire the discard information from the statistical information processing unit 124 and add it to the test frame TF.

  As described above, the failure diagnosis unit 122 can also diagnose a failure based on the discard information of the IF unit 1 on the input side given to the test frame TF and the discard information of the statistical information processing unit 124. In this case as well, the same effect as described above can be obtained. However, in the above example, the discard information of all the monitoring points is added to the common test frame TF. It is easy to associate the discard information of the units 1 with each other.

  Further, the failure diagnosis unit 122 identifies the location where the discard occurred based on the unit ID, port ID, and point ID assigned to the test frame TF. Therefore, the failure diagnosis unit 122 can easily diagnose a failure from the location where the discard occurred. Therefore, the specific time required for the cause of the failure is further shortened. Note that the point ID may be assigned to the test frame TF only by at least one monitoring point of the input-side IF unit 1 and the output-side IF unit 1.

  Further, the failure diagnosis unit 122 determines whether or not at least a part of a predetermined alarm detection condition is satisfied based on the discard information of each IF unit 1 on the input side and the output side, and monitors and controls the determination result Notify unit 3. More specifically, when the failure diagnosis unit 122 determines that all the conditions of the alarm are satisfied, the failure diagnosis unit 122 notifies the alarm and determines that only some of the conditions of the alarm are satisfied, the alarm An alert indicating the previous stage of is notified.

  For this reason, the failure diagnosis unit 122 can detect and notify the abnormality of the state in the stage before the alarm is generated at an early stage. That is, the failure diagnosis unit 122 can detect the occurrence of an alarm in advance. The operation of the fault diagnosis unit 122 will be described below with an example.

  FIG. 7 is a diagram illustrating an example of the flow of the test frame TS. In FIG. 7, reference numerals M1 to M8 denote monitoring processing blocks including the statistical information processing units 102, 111, 135, and 124 and the discard information adding units 104, 112, 136, and 126 of the respective monitoring points. In the monitoring processing blocks M1 to M8, discard information D1 to D8 corresponding to the port ID is added to the test frame TF, respectively.

  The monitoring processing blocks M1 and M2 are provided in the IF unit (# 1) 1 on the input side, and the monitoring processing blocks M3 and M4 are provided in the IF unit (# 3) 1 on the input side. The IF unit (# 1) 1 and the IF unit (# 3) 1 each function as a first unit, and the monitoring processing blocks M1 to M4 function as a first storage unit and a first grant unit, respectively.

  The monitoring processing blocks M5 and M6 are provided in the output IF unit (# 2) 1, and the monitoring processing blocks M7 and M8 are provided in the output IF unit (# 4) 1. The IF unit (# 2) 1 and the IF unit (# 4) 1 each function as a second unit, and the monitoring processing blocks M5 to M8 function as a second storage unit and a second adding unit, respectively.

  The frame generation unit 103 of the IF unit (# 1) 1 on the input side generates the test frame TFa with the port ID “# 1” and the test frame TFb with the port ID “# 2”. As shown in the dotted frame, the test frames TFa and TFb are given the discard information D1 in the monitoring process block M1 and the discard information D2 in the monitoring process block M2. The test frames TFa and TFb to which the discard information D1 and D2 are assigned are output to the SW unit 2. The discard information D1, D2 corresponds to the first discard information.

  The frame generation unit 103 of the IF unit (# 3) 1 on the input side generates a test frame TFc with a port ID “# 1” and a test frame TFd with a port ID “# 2”. The test frames TFc and TFd are given the discard information D3 in the monitoring processing block M3 and the discard information D4 in the monitoring processing block M4, as shown in the dotted frame. The test frames TFc and TFd to which the discard information D3 and D4 are assigned are output to the SW unit 2. The discard information D3, D4 corresponds to the second discard information.

  The SW unit 2 outputs the test frames TFa and TFc to the output-side IF unit (# 2) 1, and outputs the test frames TFb and TFd to the output-side IF unit (# 4) 1. Note that the output destination IF unit 1 of the test frames TFa to TFd is determined by, for example, a port ID.

  The test frames TFa and TFc input to the IF unit (# 2) 1 on the output side are given discard information D5 in the monitoring processing block M5 and are discarded in the monitoring processing block M6, as shown in the dotted frame. D6 is given. The test frames TFa and TFc are discarded by the frame discard unit 128 after the discard information D1 to D6 is extracted. The discard information D5 and D6 corresponds to the second discard information.

  The test frames TFb and TFd input to the IF unit (# 4) 1 on the output side are given discard information D7 in the monitoring processing block M7 and are discarded in the monitoring processing block M8, as shown in the dotted frame. D8 is given. The test frames TFb and TFd are discarded by the frame discard unit 128 after the discard information D1 to D4, D7, and D8 are extracted. The discard information D7, D8 corresponds to the second discard information.

  The failure diagnosis unit 122 of the IF unit (# 2) 1 diagnoses a failure based on the discard information D1 to D6 extracted from the test frames TFa and TFc, and the failure diagnosis unit 122 of the IF unit (# 4) 1 A failure is diagnosed based on the discard information D1 to D4, D7, and D8 extracted from the frames TFb and TFd.

  FIG. 8 is a diagram illustrating the discard information D1 to D8 for each of the test frames TFa to TFd. The point IDs “# 1” to “# 8” correspond to the monitoring points of the monitoring processing blocks M1 to M8, respectively. Therefore, the “counter name” and “counter value” of the point IDs “# 1” to “# 8” correspond to the discard information D1 to D8, respectively.

  In this example, it is assumed that only the counter value “OSIZE-L” among the counter names shown in FIG. 2 is treated as discard information. Further, it is assumed that the failure diagnosis unit 122 notifies an alarm when the counter value is 10 or more, and notifies an alert when the counter value is 2 or more and less than 10.

  The fault diagnosis unit 122 of the IF unit (# 2) 1 determines that the counter value “3” of the test frame TFa satisfies the alert condition. The counter values that satisfy the alert condition correspond to the unit ID “# 1”, the port ID “# 1”, and the point ID “# 6”, and the counter values of the other point IDs are all “0”. Therefore, the failure diagnosis unit 122 notifies an alert about the monitoring processing block M6 through which the user frame UF received at the port P1 of the IF unit (# 1) 1 on the input side passes.

  Further, the failure diagnosis unit 122 of the IF unit (# 2) 1 determines that the counter value “2” of the test frame TFc satisfies the alert condition. The counter values that satisfy the alert condition correspond to the unit ID “# 3”, the port ID “# 1”, and the point ID “# 4”, and the counter values of the other point IDs are all “0”. For this reason, the failure diagnosis unit 122 notifies an alert for the monitoring processing block M4 through which the user frame UF received at the port P1 of the IF unit (# 3) 1 on the input side passes.

  In this way, the failure diagnosis unit 122 diagnoses a failure based on the discard information of the input-side IF unit 1 and the discard information of the output-side IF unit 1 given to the test frame TF. Thereby, the failure diagnosis unit 122 can use the discard information of each IF unit 1 on the input side and the output side in the path of the user frame UF at a time for diagnosis of the failure.

  For this reason, the failure diagnosis unit 122 can easily diagnose a failure. Further, the supervisory control unit 3 can save the trouble of collecting the discard information from each IF unit 1. Therefore, according to the layer 2 switch of the embodiment, the specific time required for the cause of the failure can be shortened.

  Further, the failure diagnosis unit 122 identifies the location where the discard occurred based on the unit ID, port ID, and point ID assigned to the test frame TF. Therefore, the failure diagnosis unit 122 can easily diagnose a failure from the location where the discard occurred. Therefore, the specific time required for the cause of the failure is further shortened.

  Further, the failure diagnosis unit 122 determines whether or not at least a part of a predetermined alarm detection condition is satisfied based on the discard information of each IF unit 1 on the input side and the output side, and monitors and controls the determination result Notify unit 3. More specifically, the failure diagnosis unit 122 notifies an alert when it is determined that only some of the conditions of the alarm are satisfied. For this reason, the failure diagnosis unit 122 can detect and notify the abnormality of the state in the stage before the alarm is generated at an early stage.

  FIG. 9 is a flowchart illustrating an example of a diagnostic method for the layer 2 switch. In the IF unit 1 on the input side, the frame generation unit 103 generates a test frame TF (step St1).

  Next, the discard information adding unit 104 adds discard information regarding the user frame UF discarded in the NW processing unit 10 of the input-side IF unit 1 to the test frame TF (step St2). Next, the discard information adding unit 112 adds discard information regarding the user frame UF discarded in the traffic processing unit 11 of the IF unit 1 on the input side to the test frame TF (step St3).

  Next, the multiplexing unit 113 outputs the test frame TF to the IF unit 1 on the output side via the SW unit 2 (step St4).

  Next, the discard information assigning unit 136 assigns discard information regarding the user frame UF discarded in the traffic processing unit 13 of the output IF unit 1 to the test frame TF (step St5). Next, the discard information adding unit 126 adds discard information regarding the user frame UF discarded in the NW processing unit 12 of the input-side IF unit 1 to the test frame TF (step St6).

  Next, the discard information extraction unit 127 extracts discard information from the test frame TF (step St7). Next, the failure diagnosis unit 122 diagnoses a failure based on the discard information of the IF unit 1 on the input side and the IF unit 1 on the output side (step St8). Next, the frame discard unit 128 discards the test frame TF (step St9). In this way, the diagnostic method for the layer 2 switch is executed.

  FIG. 10 is a flowchart illustrating an example of failure diagnosis processing. This process is executed in step St8 described above. The following process is executed for each counter value included in the discard information.

  The failure diagnosis unit 122 determines whether or not the counter value is greater than 0 (step St11). If the counter value is 0 (No in step St11), the failure diagnosis unit 122 ends the process. Further, when the counter value is larger than 0 (Yes in Step St11), the failure diagnosis unit 122 specifies the discard occurrence location from the unit ID, the port ID, and the point ID (Step St12).

  Next, the failure diagnosis unit 122 compares the counter value with a predetermined threshold value THa (step St13). Here, counter value ≧ threshold value THa is an alarm detection condition. If the counter value ≧ threshold value THa is satisfied (Yes in step St13), the failure diagnosis unit 122 outputs an alarm to the monitoring control unit 3 (step St14).

  If the counter value ≧ threshold value THa is not satisfied (No in step St13), the failure diagnosis unit 122 compares the counter value with a predetermined threshold value THb (<THa) (step St15). Here, the counter value ≧ threshold value THb is an alert detection condition and corresponds to a part of the alarm detection condition.

  If the counter value ≧ threshold value THb is satisfied (Yes in step St15), the failure diagnosis unit 122 outputs an alert to the monitoring control unit 3 (step St16). If the counter value ≧ threshold value THb is not satisfied (No in step St15), the failure diagnosis unit 122 ends the process.

  As described above, the failure diagnosis unit 122 determines whether or not at least part of a predetermined alarm detection condition is satisfied based on the discard information, and notifies the determination result. In this way, the fault diagnosis process is executed.

  Next, the maintenance procedure of the layer 2 switch will be described.

  FIG. 11 is a flowchart showing the maintenance procedure of the comparative example. First, the supervisory control unit 3 detects that an alarm has occurred in the layer 2 switch (step St21). Next, the administrator of the layer 2 switch determines whether or not the location where the failure has occurred is specified based on the alarm (step St22).

  When the location where the failure has occurred is identified (Yes in step St22), the maintenance worker performs the maintenance operation based on the identification result (step St23). As the maintenance work, for example, replacement of the IF unit 1 in which an alarm has occurred can be cited.

  Next, the alarm of the layer 2 switch is stopped by the maintenance work (step St24). Next, the failure of the IF unit 1 in which the alarm has occurred is investigated (step St25).

  On the other hand, when the failure occurrence location is not specified (No in Step St22), the monitoring control unit 3 reads all the monitoring point statistical information from each IF unit 1 (Step St26). For this reason, the monitoring control unit 3 increases the processing load, and takes a lot of time to identify the cause of the failure.

  When the location where the failure has occurred is identified from the statistical information (Yes in step St27), the above-described steps after step St23 are executed. If the failure location is not specified from the statistical information (No in step St27), the administrator specifies the failure occurrence location based on the device log of the layer 2 switch (step St28). The device log is a record of frame processing stored in the memory of the monitoring control unit 3 or the IF unit 1, for example. Thereafter, the procedure after step St23 is executed. In this way, the maintenance procedure is executed.

  FIG. 12 is a flowchart illustrating a maintenance procedure according to the embodiment. First, the supervisory control unit 3 detects that an alarm or alert has occurred in the layer 2 switch (step St31). Next, the administrator of the layer 2 switch determines whether or not the location where the failure has occurred is specified based on the alarm or alert (step St32).

  When the location where the failure has occurred is identified (Yes in step St32), the maintenance worker performs the maintenance operation based on the identification result (step St33). Next, the alarm or alert of the layer 2 switch is stopped by the maintenance work (step St34). Next, the failure of the IF unit 1 where the alarm has occurred is investigated (step St35).

  On the other hand, when the failure occurrence location is not specified (No in step St32), the administrator specifies the failure occurrence location based on the device log of the layer 2 switch (step St36). Thereafter, the procedure after step St33 is executed. In this way, the maintenance procedure is executed.

  In the maintenance procedure of the embodiment, it is possible to specify the location where the failure has occurred based on the discard information, so that it is not necessary to read out the statistical information of all the monitoring points from the monitoring control unit 3 as in the comparative example. Therefore, according to the layer 2 switch of the embodiment, the specific time required for the cause of the failure can be shortened.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

In addition, the following additional notes are disclosed regarding the above description.
(Supplementary note 1) a first unit for receiving a frame;
A second unit for transmitting the frame received by the first unit;
The first unit is:
A first storage unit for storing first discard information related to the frame discarded in the first unit;
A generation unit for generating a dummy frame;
A first giving unit for giving the first discard information to the dummy frame;
An output unit that outputs the dummy frame to which the first discard information is attached to the second unit;
The second unit is
A second storage unit for storing second discard information related to the frame discarded in the second unit;
A transmission apparatus comprising: a diagnosis unit that diagnoses a failure based on the first discard information and the second discard information assigned to the dummy frame.
(Supplementary Note 2) The second unit includes a second provision unit that imparts the second discard information to the dummy frame,
The transmission apparatus according to appendix 1, wherein the diagnosis unit diagnoses a failure based on the first discard information and the second discard information assigned to the dummy frame.
(Additional remark 3) At least one of the 1st grant part and the 2nd grant part gives the position information which shows the position where the discard of the frame occurred to the dummy frame,
The transmission apparatus according to appendix 2, wherein the diagnosis unit identifies the location where the discard occurs based on the position information.
(Additional remark 4) Based on the said 1st discard information and the said 2nd discard information, the said diagnostic part determines whether at least one part of the detection conditions of predetermined | prescribed warning were satisfy | filled, and notifies this determination result The transmission apparatus according to any one of appendices 1 to 3, characterized in that:
(Supplementary Note 5) The transmission apparatus according to any one of Supplementary Notes 1 to 4, wherein the second unit includes a discard unit that discards the dummy frame.
(Additional remark 6) In the diagnostic method of the transmission apparatus which has the 1st unit which receives a flame | frame, and the 2nd unit which transmits the said flame | frame received by the said 1st unit,
The first unit is:
Generate a dummy frame,
Giving the dummy frame first discard information regarding the frame discarded in the first unit;
Outputting the dummy frame with the first discard information to the second unit;
The second unit is
A diagnosis method for a transmission apparatus, comprising: diagnosing a fault based on the first discard information given to the dummy frame and the second discard information regarding the frame discarded in the second unit.
(Appendix 7) The second unit is
Giving the second discard information to the dummy frame;
7. The transmission apparatus diagnosis method according to appendix 6, wherein a fault is diagnosed based on the first discard information and the second discard information assigned to the dummy frame.
(Supplementary Note 8) At least one of the first unit and the second unit gives the dummy frame position information indicating a position where the frame is discarded,
8. The transmission apparatus diagnosis method according to appendix 7, wherein the second unit specifies the location where the discard occurs based on the position information.
(Supplementary Note 9) The second unit determines whether or not at least part of a predetermined alarm detection condition is satisfied based on the first discard information and the second discard information, and notifies the determination result. A diagnostic method for a transmission apparatus according to any one of appendices 6 to 8, characterized in that:
(Additional remark 10) The said 2nd unit discards the said dummy frame, The diagnostic method of the transmission apparatus in any one of Additional remark 6 thru | or 9 characterized by the above-mentioned.

DESCRIPTION OF SYMBOLS 1 Interface unit 2 Switch unit 3 Monitoring control unit 103 Frame production | generation part 102,111,135,124 Statistical information processing part 104,112,136,126 Discard information provision part 113 Multiplexing part 122 Fault diagnosis part 128 Frame discard part

Claims (6)

A first unit for receiving a frame;
A second unit for transmitting the frame received by the first unit;
The first unit is:
A first storage unit for storing first discard information related to the frame discarded in the first unit;
A generation unit for generating a dummy frame;
A first giving unit for giving the first discard information to the dummy frame;
An output unit that outputs the dummy frame to which the first discard information is attached to the second unit;
The second unit is
A second storage unit for storing second discard information related to the frame discarded in the second unit;
A transmission apparatus comprising: a diagnosis unit that diagnoses a failure based on the first discard information and the second discard information assigned to the dummy frame. The second unit includes a second assigning unit that assigns the second discard information to the dummy frame.
The transmission apparatus according to claim 1, wherein the diagnosis unit diagnoses a failure based on the first discard information and the second discard information given to the dummy frame. At least one of the first giving unit and the second giving unit gives the dummy frame position information indicating a position where the frame is discarded,
The transmission apparatus according to claim 2, wherein the diagnosis unit identifies the location where the discard occurs based on the position information.   The diagnosis unit determines whether at least a part of a predetermined alarm detection condition is satisfied based on the first discard information and the second discard information, and notifies the determination result. The transmission device according to claim 1.   The transmission apparatus according to claim 1, wherein the second unit includes a discard unit that discards the dummy frame. In a diagnostic method for a transmission apparatus, comprising: a first unit that receives a frame; and a second unit that transmits the frame received by the first unit.
The first unit is:
Generate a dummy frame,
Giving the dummy frame first discard information regarding the frame discarded in the first unit;
Outputting the dummy frame with the first discard information to the second unit;
The second unit is
A diagnosis method for a transmission apparatus, comprising: diagnosing a fault based on the first discard information given to the dummy frame and the second discard information regarding the frame discarded in the second unit.

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