JP2014086840A - Communication apparatus, ring type network system and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a ring type network which is made port-redundant by a LAG function, from being segmented even in the case where multiple failures occur when switching a communication pathway by blocking a LAG port in response to the failure occurrence on the communication pathway in the network.SOLUTION: A communication apparatus comprises: a first LAG port formed from a plurality of first ports each for transmitting/receiving a frame and a control frame; a second LAG port formed from a plurality of second ports each for transmitting/receiving a frame and a control frame; and control means which blocks all the plurality of first ports when a failure is detected in any one of the plurality of first ports but no failure occurs in the other ports on a ring constituted by the apparatus per se, and transmits a control frame from the other LAG port where no failure occurs and, in the case where a failure occurs in the other port than the LAG port including the fault port on the ring constituted by the apparatus per se, degenerates the LAG port including the fault port.

Description

  The present invention relates to a communication device, a ring network system, and a control method.

  In a relay network, a communication path can be made redundant by providing a ring configuration. However, in general, when a failure occurs in a communication path in a ring, a frame is looped and a band is compressed. ERP (Ethernet (registered trademark) Ring Protection Switching) is effective for switching the frame transfer path at high speed while preventing such a loop.

  ERP enables layer 2 loop prevention and redundancy specialized for ring Ethernet (registered trademark), and realizes high network reliability by providing communication path redundancy in a ring network. It is a function for. However, since there is only one port between nodes constituting the ring (communication route), if a failure occurs in a plurality of communication routes, the network is divided and communication in the network becomes impossible.

  That is, in a ring network using ERP, when a communication path failure occurs, the node port for the failure point is blocked and the communication path is switched. However, when a failure (multiple failure) occurs in a plurality of communication paths, the ports for each failure are blocked, so the network is divided and a communication interruption occurs.

  Therefore, in order to avoid the occurrence of communication interruption, a plurality of physical ports are provided between nodes in a ring network using ERP. Then, the ring ports are made redundant by a LAG (Link Aggregation) function that realizes port redundancy by treating them as one logical channel. Note that the communication bandwidth of the network is equivalent to that in which the ring port is not made redundant by the LAG function. In this network, when a communication path failure occurs, by degenerating the LAG port, the occurrence of communication disconnection can be avoided even in the case of multiple failures. However, in this case, the communication band cannot be secured.

  Therefore, in order to secure a communication band, even when a failure occurs in any one of a plurality of ring ports constituting the LAG port, all the ring ports constituting the LAG port are not degenerated. Block and switch communication paths. In this network, when a communication path failure occurs, all the ring ports of the LAG port including the ring port of the node for the failed part are blocked, the communication path is switched, and the communication band is also secured. However, if a failure (multiple failure) occurs in multiple communication paths, all ring ports of the LAG port of the ring port for each failure are blocked, so the network is divided and communication disconnection occurs. End up.

  Regarding communication disconnection at the time of a failure in a ring network, Patent Document 1 discloses a method of detecting misconfiguration when a blocked port is incorrectly set (incorrect setting of a blocked port) and recovering from port blocking due to incorrect setting. Is mentioned. This document does not disclose the operation at the time of multiple failures. If this method is applied to a scene where multiple failures occur, the master node can detect the presence of multiple blocked ports, but the blocked ports are not due to misconfiguration but due to failures. Therefore, recovery from port blockage is not performed. Further, regarding multi-failure in a ring network, Patent Document 2 discloses the occurrence of multi-failure and at least one recovery from the multi-failure, but does not disclose how to secure a communication path at the time of multi-failure. Absent.

JP 2010-226318 A JP 2007-259406 A

  As described above, in a ring network with port redundancy using the LAG function, when a communication path failure occurs, when the LAG port is blocked and the communication path is switched, the network is divided when a multiple failure occurs. There is a problem that communication interruption occurs.

  An object of the present invention is to provide a node device, a ring network system, and a control method that have solved the above problems.

  A communication apparatus having an ERP function according to the present invention includes a first LAG port including a plurality of first ports that transmit and receive a frame and a control frame, and a plurality of second ports that transmit and receive a frame and a control frame. When a failure is detected at any one of the second LAG port and the plurality of first ports, if there is no other failure on the ring configured by the own device, Block all of the first ports, transmit control frames from other LAG ports that have not failed, and there are other failures other than the LAG port including the failed port on the ring configured by the local device. And a control means for degenerating the LAG port including the failed port.

  A method for controlling a communication apparatus having an ERP function according to the present invention includes a first LAG port composed of a plurality of first ports that transmit and receive a frame and a control frame, and a plurality of second LAG ports that transmit and receive a frame and a control frame. In a communication apparatus having an ERP function having a second LAG port composed of ports, if a failure is detected in any of the plurality of first ports, another failure occurs on the ring formed by the own apparatus. Is not generated, all of the plurality of first ports are blocked, a control frame is transmitted from another LAG port in which no failure has occurred, and A control step of degenerating the LAG port including the faulty port when a fault has occurred other than the LAG port including the faulty port. And butterflies.

  According to the present invention, in a ring network using ERP in which ring ports are made redundant by the LAG function, when a multiple failure occurs, the network is not divided and the occurrence of communication interruption can be avoided. .

It is a figure which shows the Ethernet ring structure in the 1st Embodiment of this invention. It is a figure which shows the operation | movement at the time of multiple failure occurrence. It is a figure which shows the operation | movement at the time of multiple failure occurrence (the 2). FIG. 10 is a diagram showing an operation when a multiple failure occurs (part 3); It is a figure which shows the operation | movement at the time of multi-fault recovery. It is a figure which shows the operation | movement at the time of multi-fault recovery. (Part 2) It is a figure which shows the operation | movement at the time of multi-fault recovery. (Part 3) It is a figure which shows the sequence of the process until a multiple failure generate | occur | produces. It is a figure which shows the operation | movement at the time of switching a communication path at the time of multiple failure generation | occurrence | production. It is a figure which shows the sequence of the process at the time of multi-fault recovery. It is a figure which shows the flowchart of the process at the time of failure occurrence. It is a figure which shows the flowchart of the process at the time of the control frame reception of a failure generation. It is a figure which shows the flowchart of a process at the time of control frame reception of a failure recovery. It is a figure which shows the operation | movement at the time of the multiple failure generation | occurrence | production in the 2nd Embodiment of this invention. It is a figure which shows the structure of the communication apparatus in the 3rd Embodiment of this invention.

  First, ITU-TG ERP movement defined in 8032 (International Telecommunication Union Telecommunication Standardization Sector) will be described. In ERP, in one Ethernet ring composed of a plurality of communication devices, a block port is set in one communication device in order to prevent a network loop. Further, as an operation when a failure occurs, when a failure occurs in a certain communication route, the route is switched to another route. The communication device that has detected the failure sets the port of the failure location as a block, and transmits a control frame requesting release of the block setting to another device. When another device that has received this control frame has a port (block port) that is set to block, the block port location on the Ethernet ring is changed and the communication path is switched by releasing the block setting. Is called.

  Next, the block setting of the ring port made redundant by the LAG function defined by IEEE 802.3ad (The Institute of Electrical and Electronics Engineers, Inc) will be described. In the embodiment of the present invention, the ring port is made redundant by the LAG function. When a failure occurs in at least one ring port among the LAG ports composed of a plurality of ring ports, the LAG port is set as a block (all ring ports included in the LAG port are set), and the communication path is switched. Do. This switching is for securing a communication band expanded by the LAG function even when a failure occurs.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  In this embodiment, in a ring network using ERP in which a ring port is made redundant by the LAG function, when a communication path failure occurs, all ring ports of the LAG port are blocked and the communication path is switched. Assumes the case. Based on that premise, when a multiple failure occurs, other ring ports are used (degenerate) in the LAG port having the ring port for the new failure.

  First, the configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an Ethernet ring composed of communication devices whose ring ports are made redundant by the LAG function. In FIG. 1, a communication terminal 300 and a communication terminal 301 are connected via an Ethernet ring including a communication device A 100, a communication device B 101, a communication device C 102, a communication device D 103, a communication device E 104, and a communication device F 105. Thus, communication is performed through the communication path 310. The communication apparatus A 100 includes a port E1, a port E2, a port W1, a port W2, and a control processing unit P. Here, the port E1 and the port E2 constitute a LAG port E, and the port W1 and the port W2 constitute a LAG port W. In addition, the control processing unit P performs control processing in the communication device. Similarly, the communication device B 101, the communication device C 102, the communication device D 103, the communication device E 104, and the communication device F 105 have a port, a LAG port, and a control processing unit. The same applies to FIGS. 2 to 7, FIG. 9, and FIG. Further, the block port 200 is set in the LAG port E1 of the communication apparatus B 101.

  Next, the operation of the first exemplary embodiment of the present invention will be described.

  2, 3, and 4 show the operation when a multiple failure occurs on the Ethernet ring shown in FIG. 1, and FIGS. 5, 6, and 7 show the operation when the multiple failure is restored. Indicates. Further, as a detailed operation, FIG. 8 shows a processing sequence up to the occurrence of multiple failures, and FIG. 10 shows a processing sequence when multiple failures are recovered. Finally, processing in the communication apparatus will be described with reference to FIGS. 11, 12, and 13. FIG. Note that control processing in the communication device is performed by a control processing unit.

  First, FIG. 2 shows an operation when a failure occurs in the line port 400 to which the communication device E 104 and the communication device F 105 are connected. A line port is synonymous with a ring port. In the communication device E 104, the block port 201 is set and the control frame 500 is transmitted on the Ethernet ring. Similarly, the communication device F 105 sets the block port 202 and transmits a control frame 501 on the Ethernet ring. The communication device A 100, the communication device B 101, the communication device C 102, and the communication device D 103 receive the control frame 500 and the control frame 501, and recognize the failure. The communication device E 104 and the communication device F 105 are connected by a line port 400 and a line port 401, and the line port 400 and the line port 401 are made redundant by the LAG function and constitute a LAG port. In FIG. 2, a failure has occurred only in the line port 400. When a failure occurs in at least one line port in a LAG port including a plurality of line ports, the LAG port including the line port is set as a block (all line ports included in the LAG port are set as block ports). Here, the line port 400 and the line port 401 are set as a block. Further, in the communication device B 101 on the same Ethernet ring, the block port 200 set in the same device is released by receiving the control frame. As a result, the communication path between the communication terminal 300 and the communication terminal 301 is switched to the communication path 311.

  FIG. 3 shows a comparison process between the own apparatus ID and the transmission source apparatus ID of the control frame when the communication apparatus F 105 receives the control frame 500 from the communication apparatus E 104. Hereinafter, the magnitude relationship between the device IDs in the ERP function will be described assuming that the communication devices A> B> C> D> E> F are set. The size relationship between the device IDs is communication device E 104> communication device F 105. Since communication device F 105 has the transmission source device ID> the own device ID, the block port 202 set when the failure occurs is released. The control frame 501 that has been transmitted is stopped. This is a process for setting the block port to either the communication device E 104 or the communication device F 105.

  FIG. 4 shows an operation when a failure occurs in the line port 403 to which the communication device C 102 and the communication device D 103 are connected. According to the premise of the operation when a failure occurs, the line port 402 and the line port 403 should be block ports like the line port 400 and the line port 401 in FIG. However, since a failure has already occurred in the line port 400 between other nodes on the same Ethernet ring, in this embodiment, block ports are set for the line port 402 and the line port 403. Absent. As a result, communication between the communication device C 102 and the communication device D 103 is possible by using the line port 402 in which no failure has occurred, and the communication path 320 passing through the line port 402 is established even in a multiple failure state. By using this, communication between the communication terminal 300 and the communication terminal 301 becomes possible.

  FIG. 5 shows an operation when a failure in the line port 400 to which the communication device E 104 and the communication device F 105 are connected is recovered. In the communication device E 104 that has detected the failure recovery, the control frame 500 transmitted when the failure occurs is stopped and the control frame 502 is transmitted to notify the other device of the failure recovery.

  In FIG. 6, the block port 203 and the block port 204 are set in the communication device C 102 and the communication device D 103 in which a failure has occurred in accordance with the failure recovery at the line port 400, respectively. As a result, the communication path between the communication terminal 300 and the communication terminal 301 is switched to the communication path 321. In addition, the communication device C 102 and the communication device D 103 transmit a control frame 503 and a control frame 504, respectively, to notify the existence of a failure to other devices.

  Finally, in FIG. 7, the communication device D 103 receives the control frame 503 from the communication device C 102, and performs a comparison process between the own device ID and the transmission device ID of the control frame. The size relationship of the device IDs is communication device C 102> communication device D 103, and in communication device D 103, transmission destination device ID> own device ID, so the block port 204 set when a failure occurs is canceled. Then, the control frame 504 that has been transmitted is stopped.

  Next, detailed operation of the first exemplary embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a sequence diagram showing processing up to the occurrence of multiple failures in the communication device B 101, the communication device C 102, the communication device D 103, the communication device E 104, and the communication device F 105.

  In the communication apparatus F 105, when a failure is detected in the line port 400 (failure detection S601), the block port 202 is set (block port setting S603). Similarly, the communication device E 104 also sets the block port 201 (block port setting S604) in order to detect a failure in the line port 400 (failure detection S602). When the setting of the block port 202 is completed, the communication device F 105 transmits a control frame 501 to another communication device to notify the failure (control frame transmission S605).

  When the communication device B 101 receives the control frame 501, the communication device B 101 recognizes the failure, and since the device has the block port 200 and no failure has occurred, the block port 200 is released (block port release). S606). The control frame 501 passes through the communication apparatus B 101.

  The communication device A 100, the communication device C 102, and the communication device D 103 also recognize the failure when receiving the control frame 501.

  When the communication device E 104 receives the control frame 501, the communication device E 104 compares the own device ID with the device ID of the communication device F 105 that is the transmission source of the control frame (device ID comparison S607). The size relationship of the device ID is communication device E 104> communication device F 105, and in communication device E 104, since the transmission source device ID <the own device ID, no particular processing is performed.

  As with the communication device F 105, the communication device E 104 transmits the control frame 500 to another communication device (control frame transmission S 608) to notify the failure when the setting of the block port 201 (block port setting S 604) is completed. ).

  When communication device B 101 receives control frame 500, control frame 501 is received first and block port 200 is released, so no particular processing is performed, and control frame 500 passes communication device B 101. To do.

  When the communication device F 105 receives the control frame 500, the communication device F 105 compares the own device ID with the device ID of the communication device F 104 that is the transmission source of the control frame (device ID comparison S609). The size relationship of the device ID is communication device E 104> communication device F 105, and in communication device E 105, the transmission source device ID> the own device ID. Therefore, transmission of the control frame 501 is stopped (control frame transmission stop S610), and the block port 202 is released (block port release S611). As a result, only the block port 201 is set on the Ethernet ring.

  Finally, the communication device C 102 detects a failure in the line port 403 (failure detection S612), and the communication device D 103 also detects a failure in the line port 403 (failure detection S613). When a failure occurs in the own device, block port setting and control frame transmission are normally performed as communication path switching processing. However, if the block port is set here, the block of the communication path is divided because the block port 201 is already set in the communication device E 104 due to a failure occurring in the line port 400 (block port setting S604). Will occur. As means for avoiding the division of the communication path, the communication path switching process is not performed (degenerated) in response to the failure of the line port 403 in the communication apparatus C 102 and the communication apparatus D 103.

  Although not the operation of the present embodiment, FIG. 9 shows the operation when the communication path switching process is performed in the communication device C 102 and the communication device D 103 when the failure of the line port 403 occurs. When a failure occurs in the line port 403, the communication device C 102 sets the block port 203, and the communication device D 103 sets the block port 204. For this reason, communication between the communication terminal 300 and the communication terminal 301 is blocked by the block port 201 in the communication path 331 and the communication path 333. The communication path 330 is blocked by the block port 203, and the communication path 332 is blocked by the block port 204. For this reason, communication disconnection occurs in communication between the communication terminal 300 and the communication terminal 301.

  Next, processing at the time of recovery from a multiple failure state will be described with reference to FIG. FIG. 10 is a sequence diagram illustrating processing at the time of multiple failure recovery in the communication device C 102, the communication device D 103, the communication device E 104, and the communication device F 105.

  The communication device F 105 detects failure recovery at the line port 400 (failure recovery detection S621).

  On the other hand, when the communication device E 104 detects failure recovery at the line port 400 (failure recovery detection S622), it transmits a control frame 502 (control frame transmission S623), and the other device communicates with itself. Notify the recovery of the failure that occurred.

  The communication device D 103 receives the control frame 502 transmitted from the communication device E 104, recognizes the recovery of the failure that has occurred in the communication device E 104, and confirms whether or not there is a failed port in the own device. In the communication device D 103, since a failure has occurred in the line port 403, the block port 204 is set in place of the communication device E 104 that has recovered from the failure (block port setting S624). Then, the control frame 504 is transmitted (control frame transmission S626) to notify the other communication apparatus that the block port has been set in the own apparatus. The control frame 502 passes through the communication apparatus B 103.

  Upon receiving the control frame 502, the communication device C 102 sets the block port 203 in place of the communication device E 104 recovered from the failure, similarly to the communication device D 103 (block port setting S625).

  The communication device E 104 receives the control frame 504 transmitted from the communication device D 103. Since the own apparatus has the block port 200 and no failure has occurred, the transmission of the control frame 502 is stopped (control frame transmission stop S627), and the block port 201 is released (block port release S628). The control frame 504 passes through the communication device E104.

  Upon receiving the control frame 504, the communication device C 102 performs a comparison process between the own device ID and the device ID of the communication device F 103 that is the transmission source of the control frame (device ID comparison S629). The size relationship of the device IDs is communication device C 102> communication device D 103. Since communication device C 102 satisfies the transmission source device ID <own device ID, no particular processing is performed.

  When the communication device C 102 finishes setting the block port 203 (block port setting S625), it transmits a control frame 503 (control frame transmission S630), and sets the block port in its own device to the other communication devices. Notify that.

  Finally, when the communication device D 103 receives the control frame 503, the communication device D 103 compares the own device ID with the device ID of the communication device F 102 that has transmitted the control frame (device ID comparison S631). The size relationship of the device ID is communication device C 102> communication device D 103, and in communication device D 103, the transmission source device ID> the own device ID. Therefore, transmission of the control frame 504 is stopped (control frame transmission stop S632), and the block port 204 is released (block port release S633). As a result, only the block port 203 is set on the Ethernet ring.

  Next, processing in the communication apparatus according to the first embodiment of the present invention will be described with reference to FIG. 11, FIG. 12, and FIG.

  FIG. 11 is a flowchart showing processing when a failure occurs.

  When the communication device detects a failure (failure detection S701), it determines whether another failure has occurred on the ring (failure determination S702). If a failure has occurred, the communication apparatus ends. If no failure has occurred, the communication device blocks all the LAG ports including the failed port (all port block S703). Next, the communication apparatus transmits a control frame (control frame transmission S704).

  FIG. 12 is a flowchart showing processing at the time of receiving a control frame notifying that a failure has occurred.

  When the communication device receives a control frame from another device (control frame reception S711), the communication device determines whether a block port exists in the own device (block port determination S712). If the block port does not exist, the communication apparatus ends. If the block port exists, the communication apparatus determines whether a failure has occurred in the own apparatus (failure determination S713). If a failure has occurred, the communication device determines whether the transmission source device ID> the own device ID (ID determination S714). If the answer is NO, the communication device is terminated, and if YES, and if the failure has not occurred, the communication device releases the block port (block port release S715). Next, the communication apparatus stops transmission of the control frame (control frame transmission stop S716).

  FIG. 13 is a flowchart showing processing at the time of receiving a control frame notifying failure recovery.

  When the communication device receives a control frame from another device (control frame reception S721), the communication device determines whether a failure exists in the own device (failure determination S722). If there is no failure, the communication device ends, and if there is a failure, the communication device blocks the failure port (failure port block S723). Next, the communication apparatus transmits a control frame (control frame transmission S724).

  As described above, in a ring network using ERP in which ring ports are made redundant by the LAG function, when a communication path failure occurs, all ring ports of the LAG port are blocked and the communication paths are switched. When a multiple failure occurs, other ring ports are used (degenerate) in the LAG port having the ring port for the new failure. As a result, in a ring network using ERP in which ring ports have been made redundant by the LAG function, when a multiple failure occurs, the network is not divided and the occurrence of communication interruption can be avoided.

  A second embodiment of the present invention will be described in detail with reference to the drawings.

  In this embodiment, in a ring network using ERP in which a ring port is made redundant by the LAG function, when a communication path failure occurs, all ring ports of the LAG port are blocked and the communication path is switched. I don't assume that. That is, when a communication path failure occurs, switching of the communication path (LAG port block setting) is not performed, and if there is at least one normal ring port among a plurality of ring ports constituting the LAG port, these are used. (Degenerate).

  The basic configuration of the second embodiment of the present invention is the same as that of the first embodiment of the present invention.

  The operation of the second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment of the present invention, as shown in FIG. 2, when a failure occurs in the line port 400, the block port 201 and the block port 202 are set, and the communication path switching process is performed. In this embodiment, as shown in FIG. 14, the line port 401 is normal, and therefore the line port 401 is used without switching the communication path. Further, when a failure occurs in the line port 403 as a multiple failure, the line port 402 is used without switching the communication path because the line port 402 is normal. As a result, as shown in FIG. 14, communication terminal 300 and communication terminal 301 can communicate with each other through communication path 340 using line port 401 even in the case of multiple failures due to failures at line port 400 and line port 403.

  When the communication band is expanded by the redundancy of the ring port by the LAG function, in FIG. 14, since the LAG port is composed of two line ports, when the failure occurs, the communication band is normal. Thus, the extended communication bandwidth cannot be secured.

  As described above, in a ring network using ERP in which a ring port is made redundant by the LAG function, a LAG having a ring port for the new failure when a communication path failure occurs or when a multiple failure occurs. Use other ring ports in the port (degenerate). As a result, in a ring network using ERP in which ring ports have been made redundant by the LAG function, when a multiple failure occurs, the network is not divided and the occurrence of communication interruption can be avoided.

  A third embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 15 shows a configuration of a communication apparatus according to the third embodiment.

  Communication apparatus 800 according to the present embodiment has an ERP function, and includes port 811, port 812, port 813, port 821, port 822, port 823, LAG port 810, LAG port 820, processing unit 830, and control unit 840. Has been.

  Each port transmits and receives a frame and a control frame. The ports 811 to 813 constitute a LAG port 810, and the ports 821 to 823 constitute a LAG port 820. The processing unit 830 performs processing of a frame with a port and a control frame, and processing of failure information and control information with the control unit. The control unit 840 receives failure information and control frame information from each port via the processing unit 830, and performs port block control and control frame transmission control.

  Here, it is assumed that a failure is detected at the port 811. The control unit 840 determines whether any other failure has occurred on the ring configured by the own apparatus based on the history of the control frame information received so far. If not, all the ports of the LAG port 810 including the failed port 811, the port 811, the port 812, and the port 813 are blocked, and a control frame is transmitted from the unblocked LAG port 820.

  Here, for example, it is assumed that a control frame is received from another device at the port 821. Then, since there is a block port (LAG port 810) resulting from the occurrence of a failure at the port (port 811) of the own device, the control frame is based on the table indicating the priority of the device ID possessed in advance. It is determined whether the transmission source device ID is higher than the own device ID. If it is higher, the block port (LAG port 810) is released, and transmission of the control frame from the LAG port 820 is stopped.

  Further, it is assumed that the initial block port (LAG 810) is a block port (that is, the node device 800 is an Owner node) that is not caused by the occurrence of a failure in the port (port 811) of the own device. In this case, for example, when a control frame from another device is received at the port 821, the block port (LAG port 810) is released, and transmission of the control frame from the LAG port 820 is stopped.

  In a ring network using the ERP configured with the above-described communication device and having a ring port made redundant by the LAG function, when a communication path failure occurs, all the ring ports of the LAG port are blocked and communication is performed. Switch the route. When a multiple failure occurs, other ring ports are used (degenerate) in the LAG port having the ring port for the new failure. As a result, in a ring network using ERP in which ring ports have been made redundant by the LAG function, when a multiple failure occurs, the network is not divided and the occurrence of communication interruption can be avoided.

  The present invention can be used for a communication device, a ring network system, and a control method.

100 Communication device A
101 Communication device B
102 Communication device C
103 Communication device D
104 Communication device E
105 Communication device F
E1, E2, W1, W2 port E, W LAG port P Control processing unit 200, 201, 202, 203, 204 Block port 300, 301 Communication terminal 310, 311, 320, 321, 330, 331, 332, 333, 340 Communication path 400, 401, 402, 403 Line port 500, 501, 502, 503, 504 Control frame S601, S602 Failure detection S603, S604 Block port setting S605 Control frame transmission S606 Block port release S607 Device ID comparison S608 Control frame transmission S609 Device ID comparison S610 Control frame transmission stop S611 Block port release S612, S613 Failure detection S621, S622 Failure recovery detection S623 Control frame transmission S624, S625 Block point S626 Control frame transmission S627 Control frame transmission stop S628 Block port release S629 Device ID comparison S630 Control frame transmission S631 Device ID comparison S632 Control frame transmission stop S633 Block port release S701 Failure detection S702 Failure determination S703 All port blocks S704 Control frame transmission S711 Control frame reception S712 Block port determination S713 Failure determination S714 ID determination S715 Block port release S716 Control frame transmission stop S721 Control frame reception S722 Failure determination S723 Fault port block S724 Control frame transmission 800 Communication device 810, 820 LAG port 811 812 813, 821, 822, 823 Port 830 Processing unit 840 Control unit

Claims (7)

A first LAG (Link Aggregation) port composed of a plurality of first ports for transmitting and receiving frames and control frames;
A second LAG port composed of a plurality of second ports for transmitting and receiving frames and control frames;
If a failure is detected in any of the plurality of first ports, and if no other failure has occurred on the ring configured by the own device, all of the plurality of first ports are blocked. When a control frame is transmitted from another LAG port in which no failure has occurred, and when a failure has occurred other than the LAG port including the failure port on the ring configured by the own device, A communication apparatus having an ERP (Ethernet Ring Protection Switching) function, comprising: a control means for degenerating a LAG port including a failed port. The control means includes
When a failure notification control frame is received from another device on the ring that the device itself constitutes, there is a block port resulting from the failure occurrence at the port of the device, and the source device ID of the control frame is When the priority is higher than the own device ID, the block port is released, the transmission of the control frame is stopped, and the own device has a block port that is not caused by a failure in the own device port. 2. The communication apparatus having an ERP function according to claim 1, further comprising means for canceling the block port and stopping transmission of the control frame. Two or more communication devices including the communication device according to claim 1 or 2 are configured in a ring shape,
In each of the communication apparatuses, a ring type is connected on the one hand with an adjacent communication apparatus between the first LAG ports and on the other hand with an adjacent communication apparatus connected with the second LAG port. Network system.   When a failure occurs in a single communication path, all the ring ports of the LAG port are blocked and the communication path is switched. A ring network system using ERP in which a ring port is made redundant by a LAG function characterized by being used (degenerate). A first LAG port comprising a plurality of first ports for transmitting and receiving frames and control frames;
In a communication apparatus having an ERP function having a second LAG port composed of a plurality of second ports that transmit and receive a frame and a control frame,
If a failure is detected in any of the plurality of first ports, and if no other failure has occurred on the ring configured by the own device, all of the plurality of first ports are blocked. When a control frame is transmitted from another LAG port in which no failure has occurred, and when a failure has occurred other than the LAG port including the failure port on the ring configured by the own device, A control method for a communication apparatus having an ERP function, comprising a control step of degenerating a LAG port including a failed port. The control step includes
When a failure notification control frame is received from another device on the ring that the device itself constitutes, there is a block port resulting from the failure occurrence at the port of the device, and the source device ID of the control frame is When the priority is higher than the own device ID, the block port is released, the transmission of the control frame is stopped, and the own device has a block port that is not caused by a failure in the own device port. 6. The method of controlling a communication apparatus having an ERP function according to claim 5, further comprising a step of releasing the block port and stopping transmission of the control frame.   When a failure occurs in a single communication path, all the ring ports of the LAG port are blocked and the communication path is switched. A method of controlling a ring network system using ERP in which a ring port is made redundant by a LAG function characterized by being used (degenerate).

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