JP4447385B2 - RPR node apparatus and forwarding path control method for RPR network - Google Patents

Description

  The present invention relates to an RPR node device, and particularly to an RPR node device having a bridge function and a forwarding path control method for an RPR network.

  As a method for configuring a redundant network in a layer 2 network, there is a spanning tree protocol (hereinafter referred to as “STP”) standardized as IEEE 802.1d (Non-patent Document 1). To do. The STP can prevent a situation in which data continuously circulates in the loop by treating the redundant bridge network as a logical tree structure in which no loop portion exists. In a network to which STP is applied, a priority is given to each bridge constituting the network, and a cost is given to each link connecting each bridge. At this time, the bridge with the highest priority is set as the root bridge, and a plurality of segments (logical tree structure) consisting of forwarding paths from which the low-cost route is selected from the bridge is formed. Is done. When a failure occurs on the network, a new segment (logical tree structure) is generated to avoid this failure.

  Next, the flow of processing in the logical tree structure (segment) formed by STP will be described. In each segment, a designated bridge that serves as a relay bridge for the forwarding path is defined. The selection of the root bridge and each designated bridge is performed based on a frame called a BPDU (Bridge Protocol Data Unit) that is transmitted between these bridges. The root bridge periodically transmits BPDUs having the same contents to notify the soundness of the forwarding path. When each designated bridge receives a BPDU from a port (hereinafter referred to as “root port”) existing on the upstream direction (root bridge direction) side of the forwarding path, it adds its STP information to the received BPDU, The BPDU is transmitted to a port (hereinafter referred to as “designated port”) existing in the downstream direction (next designated bridge direction) side of the forwarding path.

  BPDUs received by each bridge are aged by a MaxAge timer. If the MaxAge timer expires and a predetermined time has elapsed (timeout), the designated bridge is re-selected and the forwarding path is updated. Therefore, when a bridge on the forwarding path fails, the downstream bridge waits for the time set by the MaxAge timer before starting forwarding path reconfiguration, and takes 20 seconds by default. Each port of the bridge has four states: blocking, listening, learning, and forwarding. The completed state, that is, the ports on the forwarding path in the steady state (root port and designated port) are forwarding. A port that is set to a state and not in a steady state is set to a blocking state.

  On the other hand, standardization work has been promoted as IEEE 802.17 (Non-patent Document 2) as a transmission technique for a ring network in which a plurality of nodes are connected via bidirectional double ring lines having mutually opposite transmission directions. There is a Resilient Packet Ring (hereinafter referred to as “RPR”). In RPR, each ring node on a bidirectional double ring line advertises its physical address on the ring, and each ring node collects the advertisement information and creates a topology map that is the order of each node. In addition to recognizing, when transmitting a packet on the ring, it has a function of referring to the topology map and selecting and transmitting a ring of a system close to the physical address of the destination. Also, by constantly monitoring the failure information periodically transmitted by each ring node, a failure detour function (hereinafter referred to as “protection function”) at the time of a ring failure that quickly detects a failure point on the ring and switches the route. ")".

Next, details of the protection function in the RPR described above will be described.
(1) Creation of topology map In RPR, it is grasped in what order each node is connected, and a topology map for each node is created. More specifically, each node transmits a control frame called a TP (Topology and Protection) frame to both rings at a fixed period, an initial value of 255, and a TTL (Time To Alive) subtracted by 1 for each relay. Based on the value and the received TP frame, the position of the TP frame transmission node (number of relay nodes) viewed from each node is grasped for each node, and a topology map for each node is created.

(2) Detection and publicity of ring fault information between adjacent nodes Normally, each node receives a keepalive frame from the immediately upstream node (upstream adjacent node) when transmitting the TP frame to both rings. To do. If the KeepAlive frame does not arrive, or if the reception failure of the own node, a failure between the links from the immediately upstream node to the own node is assumed. Whether the source of the KeepAlive frame is the immediate upstream node is determined based on the topology map of (1). The link status information with the immediately upstream node is sent to the immediately downstream node (adjacent node in the downstream direction) on the TP frame and transmitted to all the downstream nodes. All the receiving nodes grasp the received link state of the TP frame source node, and map which link on the ring is in a failure state.

(3) Switching of RPR data frame transmission direction Each node reaches the destination node based on the topology map generated in (1) and the link failure information detected in (2). A transmission ring having a small number of node relays and no ring failure is selected, and a predetermined RPR data frame is transmitted.

  In RPR, there is a rule that the fault detour time is a maximum of 50 milliseconds. Therefore, processing from when a failure occurrence location is detected based on failure information until switching of the transmission direction of the RPR data frame is performed within 50 milliseconds, and link switching at the time of failure is quickly performed.

IEEE 802.1d (ISO / IEC Final DIS 15802-3 (IEEE P802.1D / D17), May 25, 1998) IEEE 802.17 (IEEE Draft P802.17 / D3.0, November 12, 2003)

  By the way, both the STP defined in the above-mentioned Non-Patent Document 1 and the RPR defined in Non-Patent Document 2 have the above-described features (advantages), and constitute a network utilizing the characteristics of both. It is possible to do. That is, it is conceivable to apply an STP having a function of preventing data circulation in a loop, even in a network in which a physical loop is formed, to an RPR network characterized by fast failure recovery.

  However, each of STP and RPR is formulated as a mutually independent rule, and is not a rule intended to link the two. Therefore, in the RPR network to which the STP is applied, when a failure is detected on the upstream node on the forwarding path or the route to the upstream node, it is necessary to wait for the Max Age time of the STP before reconfiguring the forwarding path. There was a problem that the time of network down could not be shortened effectively.

  The present invention has been made in view of the above, and provides an RPR node apparatus and a forwarding path control method for an RPR network that can further reduce the time required to reconfigure a forwarding path in an RPR network to which an STP is applied. The purpose is to provide.

In order to solve the above-described problems and achieve the object, an RPR node device according to the present invention is an RPR node device connected to an RPR (Resilient Packet Ring) network to which an STP (Spanning Tree Protocol) is applied. , One RPR control unit connected to one bidirectional double ring line among a plurality of bidirectional double ring lines constituting the RPR network, and data on the one bidirectional double ring line The other RPR control unit connected to another bi-directional double ring line different from the one bi-directional double ring line to be transferred, and the one RPR control unit and the other RPR control unit. A bridge control unit connected between the pair of RPR control units, the pair of RPR control units on a bidirectional double ring to which the pair of RPR control units are connected. Transmission from a BPDU transmission source node management unit that identifies a BPDU transmission source node device that is a node device to be monitored based on the recognized STP information, and an RPR control unit arranged on the bidirectional double ring line And a forwarding path failure determination unit that manages both paths to the BPDU transmission source node device monitored by the BPDU transmission source node management unit based on the failure information to be transmitted, the forwarding path failure determination unit When it is determined that both paths of the double ring line are faulty, a forwarding path reconfiguration signal is output without detecting a timeout due to STP .

  According to the present invention, the RPR node device connected to the bidirectional double ring line is provided with the BPDU transmission source node management unit and the forwarding path failure determination unit. When the forwarding path failure determination unit determines that there is a failure in both paths between the own device and the BPDU transmission source node device monitored by the BPDU transmission source node management unit, the forwarding path failure determination unit does not wait for the Max Age time of STP. Outputs path reconstruction signal.

  According to the RPR node device according to the present invention, the forwarding path reconfiguration signal is output without waiting for the STP MaxAge time, so that it is possible to reduce the network down time.

  Embodiments of an RPR node device and a forwarding path control method for an RPR network according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of an RPR node device 100 according to the first embodiment of the present invention. The RPR node device 100 shown in the figure is inserted on a bidirectional double ring line having mutually opposite transmission directions and is connected to one and the other of the bidirectional double ring lines, respectively. , 102 and a bridge control unit 103 connected between the RPR control unit 101 and the RPR control unit 102. In the figure, one and the other of the bidirectional double ring lines are independent ring lines, and each of the RPR control units 101 and 102 performs predetermined RPR control on these ring lines. In addition, the bridge control unit 103 has an STP function and also has a processing function related to an association operation between the RPR control unit 101 and the RPR control unit 102. The detailed configurations of the RPR control units 101 and 102 are the same, and only the configuration of the RPR control unit 101 will be described below, and the description of the configuration of the RPR control unit 102 will be omitted.

  In FIG. 1, an RPR control unit 101 includes an inner ring transmission unit 110, an inner ring drop determination unit 111, and an inner ring reception unit 112 connected to an inner ring of a bidirectional double ring line to which the RPR control unit 101 is connected. And each processing unit of an outer ring receiving unit 113, an outer ring drop determining unit 114, and an outer ring transmitting unit 115 connected to the outer ring of the bidirectional double ring line. The RPR control unit 101 includes, as processing units related to the linkage processing with the RPR control unit 102 in the same node device, an RPR interface transmission unit 116, an RPR interface reception unit 117, a protection unit 118, a topology management unit 119, and a BPDU. A transmission source node management unit 120 and a forwarding path failure determination unit 121 are provided.

  Next, processing functions of each component of the RPR node device shown in FIG. 1 will be described. In the figure, an inner ring transmission unit 110 and an outer ring transmission unit 115 have both functions of an Add function for adding predetermined information to a transmission frame and a Transit function for relaying a reception frame. The inner ring drop determination unit 111 and the outer ring drop determination unit 114 determine whether or not to relay the received frame, or determine whether or not to drop the received frame. The inner ring receiving unit 112 and the outer ring receiving unit 113 receive transmission frames transmitted from other RPR node devices.

  The RPR interface transmission unit 116 generates an RPR frame and selects whether to add to the inner ring or the outer ring. The RPR interface receiving unit 117 identifies whether the received RPR frame is a data frame, an RPR control frame, or an STP BPDU, extracts a MAC frame from the RPR frame, and passes it to the bridge control unit 103. Process. The protection unit 118 grasps the failure status on the ring and notifies the topology management unit 119 and the forwarding path failure determination unit 121 of the failure information. The topology management unit 119 manages the arrangement order of the nodes on the ring. The BPDU source node management unit 120 grasps the source node and STP information of the BPDU transmitted from the ring, specifies the BPDU source node to be monitored based on the STP information from the bridge control unit 103, and The processing information is held. The forwarding path failure determination unit 121 manages two routes to a node (monitoring node) monitored by the BPDU transmission source node management unit 120 based on failure information from the protection unit 118, and routes from the own node to the monitoring node When both are faulty, a control signal for requesting start of reconfiguration of the forwarding path is output to the bridge control unit 103. Note that communication with the bridge control unit 103 is performed via the bridge ports 122 and 123.

  Next, the operation of the RPR node device will be described with reference to FIG. FIG. 2 is a diagram showing three independent RPR networks interconnected by the RPR node device of the present invention. Further, as a premise for the following description, in the network shown in the figure, a logical forwarding path is formed by the STP function, and at the initial stage, the RPR node device 503 is elected as the root bridge, and the RPR node Assume that the devices 504 and 505 are elected as a bridge having a root port and a designated port, and the RPR node device 506 is elected as a bridge having a root port and a blocking port.

  In FIG. 2, RPR networks 500, 501, and 502 constitute rings # 1, # 2, and # 3, which are three independent RPR networks, and are physically connected via RPR node devices 504, 505, and 506. It is connected. The RPR node device 503 having the bridge control unit transmits the BPDU downstream of the forwarding path. The RPR node device 504 having the bridge control unit receives the BPDU from the RPR node device 503 that is the root bridge, and transmits the BPDU downstream of the forwarding path in consideration of the STP information of the own bridge. Similarly, the RPR node device 505 having the bridge control unit also receives the BPDU from the RPR node device 503 that is the root bridge, and transmits the BPDU downstream of the forwarding path in consideration of the STP information of the own bridge. On the other hand, the RPR node device 506 having the bridge control unit does not transmit the BPDU downstream of the forwarding path. That is, RPR node device 504 is set as a node device responsible for data transfer between ring # 1 and ring # 2, and RPR node device 505 is set as a node device responsible for data transfer between ring # 1 and ring # 3. On the other hand, the RPR node device 506 is set as a node device that does not perform data transfer between the ring # 2 and the ring # 3, and prevents data from circulating between the three rings. The RPR control units 507, 508, and 509 are node devices that do not have a bridge control function, and are not physically connected to other rings. Also, these control units are not subject to control processing based on STP, and are responsible only for RPR operations.

  FIG. 3 is a diagram in which the network configuration shown in FIG. 2 is replaced with an equivalent bridge configuration. The correspondence relationship between FIG. 2 and FIG. 3 will be described. The root bridge 511 shown in FIG. 3 corresponds to the RPR node device 503 shown in FIG. Similarly, the bridge 1 (512) corresponds to the RPR node device 504, the bridge 2 (513) corresponds to the RPR node device 505, and the bridge 3 (514) corresponds to the RPR node device 506.

  Further, in FIG. 3, a forwarding path 510 as indicated by a bold line is generated, but after the completion of the forwarding path configuration, it becomes a steady state, and the bridge port of each bridge constituting the node device is in a forwarding state or a blocking state. Transition to one of the states. For example, in FIG. 3, one port of the root bridge is in the forwarding state, and both ports of the bridges 1 and 2 are in the forwarding state. On the other hand, one port of the bridge 3 is in the forwarding state, but the other port is in the blocking state. In such a steady state, a predetermined RPR node device specifies an RPR node device (adjacent node in the upstream direction) immediately above the forwarding path as an RPR node device to be monitored at all times. . Hereinafter, this process will be described.

  FIG. 4 is a flowchart showing a processing flow for specifying an RPR node device to be monitored by a predetermined RPR node device. The BPDU source node management unit 120 of the RPR node device shown in FIG. 1 receives the RPR frame (step S101) and determines whether the received RPR frame is a BPDU (step S102). If the received RPR frame is not a BPDU (step S101, No), the subsequent processing is not performed. On the other hand, when the received RPR frame is a BPDU (step S101, Yes), the BPDU transmission source node management unit 120 transmits the transmission source MAC address included in the RPR header and the STP information included in the BPDU (for example, bridge Nodes to be monitored based on the latest STP information and the STP information stored and held, and the priority, bridge ID, port priority, port ID, etc.) are extracted and stored in a predetermined storage area (step S103). A device is specified (step S104). Thereafter, the above processing is repeated until the line is in a steady state.

  When the network is in the forwarding path configuration, the root port, designated bridge, or root port and designated port of the bridge control unit of the RPR node device are not determined. There may be a plurality of target RPR node devices), and it is necessary to secure a storage area for storing all of them.

  FIG. 5 is a flowchart illustrating a processing flow in which a predetermined RPR node device outputs a forwarding path reconfiguration signal to the bridge control unit. The forwarding path failure determination unit 121 of the RPR node device shown in FIG. 1 grasps failure information by monitoring a route (two routes passing through the inner ring and the outer ring) to the BPDU transmission source device, or other A failure is detected by a TP frame broadcast from the RPR control unit of the RPR node device (step S201). At this time, it is determined whether or not a failure exists in both the inner ring and the outer ring (step S202). If there is no failure in both the inner ring and outer ring paths (step S202, No), on the other hand, if there is a failure in both the inner ring and outer ring paths (step S202, Yes). The forwarding path reconfiguration signal is output to its own bridge control unit (step S203). As described above, the forwarding path failure determination unit 121 of the RPR node device that has detected the failure reconfigures the network without waiting for the Max Age time of the STP when the failure of both the inner ring and the outer ring is detected. For this reason, a network down time can be limited.

  In the process of step S201 described above, the forwarding path failure determination unit 121 performs the following process. That is, the forwarding path failure determination unit 121 sends the topology map of the outer ring notified from the topology management unit 119 in the reverse direction from its own RPR node device to the stored BPDU transmission source node (RPR node device to be monitored). And confirms whether or not there is a failure on the route based on the failure information notified from the protection unit 118. Similarly, the topology map of the inner ring notified from the topology management unit 119 is confirmed in the reverse direction from its own RPR node device toward the stored BPDU transmission source node (RPR node device to be monitored), and on the route Check if there are any problems.

  FIG. 6 is a diagram showing an example of a failure occurring in both rings on the RPR network shown in FIG. The operation of the RPR node device up to the start of forwarding path reconfiguration will be described using the failure occurrence example shown in FIG. In the figure, the RPR node device 504 functions as a designated bridge of the RPR node device 506 in a normal state (a state in which no failure has occurred), and the RPR node device 503 functioning as a root bridge transmits. Relaying PDUs. The RPR node device 506 determines the BPDU transmission source device as the RPR node device 504 by the BPDU transmission source node management unit 120 and monitors the RPR node device 504.

  Next, as shown in FIG. 6, when failure occurrence 1 occurs in the outer ring of ring # 2, RPR control unit 508-1 broadcasts and transmits a TP frame including failure information that is an RPR control frame. . Upon receiving this TP frame, each RPR node device grasps failure information “failure occurrence” on the outer ring between the RPR node device 504 and the RPR control device 508-1. At this time, the RPR node device 506 determines that there is a failure on the route using the outer ring from the own device to the BPDU transmission source device. However, the route using the inner ring from the own device to the BPDU source device is normal, and the BPDU is transmitted using this route and reaches the RPR node device 506, so there is no need to reconstruct the forwarding path.

  Further, as shown in FIG. 6, when the failure occurrence 2 occurs in the inner ring of the ring # 2, the RPR control device 508-2 broadcasts a TP frame including failure information. Upon receiving this TP frame, each RPR node device grasps failure information “failure occurrence” on the inner ring between the RPR node device 504 and the RPR control device 508-1. At this time, the RPR node device 506 determines that there is a failure on the route using the inner ring from the own device to the BPDU transmission source device. As a result, the RPR node device 506 determines that there is a failure in both paths, and outputs a forwarding path reconfiguration signal to the bridge control unit. The bridge control unit that has received this signal immediately transitions the port in the blocking state (blocking port) to the listening state.

  FIG. 7 is a diagram in which the network configuration shown in FIG. 6 is replaced with an equivalent bridge configuration. Although a failure between bridge 1 (513) and bridge 3 (514) can be quickly detected based on the above failure information (RPR failure information), this RPR failure information is used when only STP is used. Therefore, after the BPDU reception timeout (Max Age time) elapses, it is known that a failure has occurred between the bridge 1 (513) and the bridge 3 (514). Note that after the forwarding path is reconfigured, the forwarding path as shown in FIG. 8 is formed by the STP function.

  As described above, the RPR node device according to this embodiment constantly monitors the BPDU transmission source device and links the rapid failure detection, which is an advantage of RPR, with the failure detection on the forwarding path of the STP. The time until path reconfiguration can be shortened, and as a result, the time of network down can be shortened.

  The forwarding path failure determination unit 121 of this embodiment monitors a route to a BPDU transmission source device or detects a failure based on a TP frame transmitted from another RPR node device. Confirms whether or not the TP frame (control frame for storing fault information) of the BPDU source device monitored by the BPDU source node management unit 120 has arrived, and both rings (inside and outside) for a certain period of time. If it is not received in the ring), it may be determined that there is a failure in the forwarding path, and a forwarding path reconfiguration signal may be output.

  In this embodiment, the case where STP is applied to the RPR network has been described. However, the present invention is not limited to the RPR network, and can be applied to a network in which a VLAN (Virtual LAN) is set. In this case, a configuration may be adopted in which the STP is selectively used for each VLAN and the BPDU transmission source device to be monitored is specified for each VLAN.

Embodiment 2. FIG.
FIG. 9 is a block diagram showing a configuration of the RPR node device according to the second exemplary embodiment of the present invention. The RPR node device shown in the figure includes a BPDU transmission source device determination unit 150 instead of the BPDU transmission source node management unit 120 shown in FIG. In addition, about another structure, it is the same as that of Embodiment 1, or is equivalent, The same code | symbol is attached | subjected and shown to these parts.

  By the way, the RPR node device according to the first embodiment is configured to identify the BPDU transmission source node to be monitored based on the STP information from the bridge control unit 103. That is, in the first embodiment, a part of the function (existing function) of the bridge control unit is used when specifying the BPDU transmission source node to be monitored. On the other hand, in the RPR node device of this embodiment, the BPDU transmission source device determination unit 150 in the RPR control unit has this function. By adopting such a functional configuration, it is possible to shorten the time required for exchanging information between the bridge control unit and the RPR control unit. As a result, the transmission timing of the forwarding path reconfiguration signal can be advanced, and the network down time can be further shortened.

  Next, only the operation of the RPR node device shown in FIG. 9 that is different from that of the RPR node device shown in FIG. 1 will be described. In FIG. 9, the BPDU transmission source device determination unit 150 determines whether or not the received RPR frame is a BPDU, and when the received RPR frame is a BPDU, the transmission source MAC address included in the RPR header and the BPDU STP information (for example, bridge priority, bridge ID, port priority, port ID, etc.) contained in the STP function is extracted and stored in a predetermined storage area, and the STP function incorporated in the BPDU transmission source device determination unit 150 Is used to identify the BPDU source device (designated bridge, root bridge) upstream of the forwarding path. This specifying process is performed as follows. That is, every time a BPDU source device determination unit 150 receives a BPDU including STP information, the BPDU source device determination unit 150 compares the STP information included in the received BPDU with the STP information held by itself, and becomes superior STP information. And the source node are always stored to identify the BPDU source device (that is, the RPR node device) to be monitored. Note that the failure determination process performed by the forwarding path failure determination unit 121 after the BPDU transmission source device to be monitored is specified is the same as that in the first embodiment, and the description thereof is omitted.

  As described above, the RPR node device according to this embodiment constantly monitors the BPDU transmission source device, as in the first embodiment, and detects a failure on the STP forwarding path, which is an advantage of RPR. Since the connection is made, the time required to reconstruct the forwarding path can be shortened. In addition, since a part of the STP function of the bridge control unit is incorporated into the RPR control unit, the time required for exchanging information between the bridge control unit and the RPR control unit can be shortened. Thus, the transmission timing of the forwarding path reconfiguration signal can be advanced, and the network down time can be further shortened.

  The forwarding path failure determination unit 121 of this embodiment monitors a route to a BPDU transmission source device or detects a failure based on a TP frame transmitted from another RPR node device. Confirms whether or not the TP frame of the BPDU source device monitored by the BPDU source node management unit 120 has arrived, and has not been received in both rings (inner and outer rings) for a certain period of time. Alternatively, it may be determined that there is a failure in the forwarding path, and a forwarding path reconfiguration signal may be output.

  In this embodiment, the case where STP is applied to the RPR network has been described. However, the present invention is not limited to the RPR network, and can be applied to a network in which a VLAN (Virtual LAN) is set. In this case, a configuration may be adopted in which the STP is selectively used for each VLAN and the BPDU transmission source device to be monitored is specified for each VLAN.

  As described above, the RPR node device according to the present invention is useful as an RPR node device connected to an RPR network to which STP is applied, and is particularly suitable as a node device that can shorten the time of network down.

It is a block diagram which shows the structure of the RPR node apparatus concerning Embodiment 1 of this invention. FIG. 3 shows three independent RPR networks interconnected by the RPR node device of the present invention. FIG. 3 is a diagram in which the network configuration shown in FIG. 2 is replaced with an equivalent bridge configuration. It is a flowchart which shows the processing flow which specifies the RPR node apparatus which a predetermined RPR node apparatus should monitor. It is a flowchart which shows the processing flow from which a predetermined | prescribed RPR node apparatus outputs a forwarding path reconstruction signal to a bridge control part. It is the figure which showed an example of the failure which generate | occur | produced in both rings on the RPR network shown in FIG. FIG. 7 is a diagram in which the network configuration shown in FIG. 6 is replaced with an equivalent bridge configuration. It is a figure which shows the forwarding path reconfigure | reconstructed after the occurrence of a failure. It is a block diagram which shows the structure of the RPR node apparatus concerning Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 RPR node apparatus 101,102 RPR control part 103 Bridge control part 110 Inner ring transmission part 111 Inner ring Drop determination part 112 Inner ring reception part 113 Outer ring reception part 114 Outer ring Drop determination part 115 Outer ring transmission part 116 RPR interface transmission Unit 117 RPR interface reception unit 118 protection unit 119 topology management unit 120 BPDU transmission source node management unit 121 forwarding path failure determination unit 122 bridge port 150 transmission source device determination unit 500, 501, 502 RPR network 503, 504, 505, 506 RPR Node devices 507, 508, 508-1, 508-2, 509 RPR control unit 510, 540 Forwarding path 511 Root bridge 51 Bridge 1
513 Bridge 2.

Claims (10)

In an RPR node device connected to an RPR (Resilient Packet Ring) network to which STP (Spanning Tree Protocol) is applied,
One RPR control unit connected to one bidirectional double ring line of the plurality of bidirectional double ring lines constituting the RPR network;
The other RPR control unit connected to another bidirectional double ring line different from the one bidirectional double ring line to which data on the one bidirectional double ring line is transferred;
A bridge controller connected between a pair of RPR controllers composed of the one RPR controller and the other RPR controller;
With
The pair of RPR controllers are
A BPDU source node management unit that identifies a BPDU source node device that is a node device to be monitored based on STP information grasped on a bidirectional double ring to which the device is connected;
Forwarding path failure determination for managing both paths to the BPDU source node device monitored by the BPDU source node management unit based on failure information transmitted from the RPR control unit arranged on the bidirectional double ring line And
With
The forwarding path failure determination unit outputs a forwarding path reconfiguration signal without detecting a timeout due to STP when it is determined that there is a failure in both paths of the bidirectional double ring line. Node device.   The BPDU transmission source node management unit stores and holds a transmission source MAC address included in an RPR header and STP information included in a BPDU when the received RPR frame is a BPDU. The RPR node device described.   The BPDU transmission source node management unit specifies a BPDU transmission source node device to be monitored based on STP information included in the received BPDU and STP information stored and retained. The RPR node device described.   The BPDU transmission source node management unit is configured to monitor the BPDU transmission source node apparatus to be monitored based on the transmission source node information acquired by comparing the received BPDU information with the BPDU information held by the BPDU transmission source and the highly advantageous STP information. The RPR node device according to claim 2, wherein the RPR node device is specified.   The forwarding path failure determination unit checks the status of both paths based on failure information output on the plurality of bidirectional double ring lines, and determines whether there is a failure in the forwarding path. Item 5. The RPR node device according to Item 3 or 4.   The forwarding path failure determination unit confirms whether or not the failure information storage control frame of the BPDU transmission source device monitored by the BPDU transmission source node management unit has arrived, and has a predetermined period in both rings. The RPR node apparatus according to claim 3 or 4, wherein when not received, the forwarding path is determined to be faulty. In a forwarding path control method of an RPR network for controlling a forwarding path formed in an RPR (Resilient Packet Ring) network to which an STP (Spanning Tree Protocol) is applied, in the event of a failure,
One bidirectional double ring line of the plurality of bidirectional double ring lines constituting the RPR network and the one bidirectional double ring to which data on the one bidirectional double ring line is transferred A plurality of node devices connected to both other bidirectional double ring lines different from the line;
Each of the plurality of node devices is a BPDU transmission source node that identifies a BPDU transmission source node device that is a node device to be monitored based on STP information grasped on a bidirectional double ring to which the plurality of node devices are connected. Administrative steps;
Whether there is a failure in both paths leading to the BPDU source node device monitored in the BPDU source node management step based on the failure information transmitted from the node device arranged on the bidirectional double ring line A forwarding path failure determination step for determining whether or not,
Including
Forwarding path failure determination step is provided in the node device determines that there is a failure in both paths of the bidirectional double ring lines, without waiting for detection of the timeout by STP, forwarding on the bidirectional double ring line A forwarding path control method for an RPR network, characterized by outputting a path reconfiguration signal.   The BPDU transmission source node management step includes a step of storing and holding a transmission source MAC address included in the RPR header and STP information included in the BPDU when the received RPR frame is a BPDU. The forwarding path control method for an RPR network according to claim 7.   The BPDU transmission source node management step includes a step of specifying a BPDU transmission source node device to be monitored based on STP information included in the received BPDU and STP information stored and retained. The forwarding path control method for an RPR network according to claim 8. The BPDU transmission source node management step includes:
A comparison step for comparing the received BPDU information with the BPDU information held by itself;
Identifying the BPDU source node device to be monitored based on the source node information acquired in the comparison step and the STP information having a high advantage;
The forwarding path control method of the RPR network according to claim 8, wherein:

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