WO2006027817A1 - Systeme de communication et appareil de nœud - Google Patents

Systeme de communication et appareil de nœud Download PDF

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Publication number
WO2006027817A1
WO2006027817A1 PCT/JP2004/012829 JP2004012829W WO2006027817A1 WO 2006027817 A1 WO2006027817 A1 WO 2006027817A1 JP 2004012829 W JP2004012829 W JP 2004012829W WO 2006027817 A1 WO2006027817 A1 WO 2006027817A1
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WO
WIPO (PCT)
Prior art keywords
vlan
frame
trunk
node device
branch network
Prior art date
Application number
PCT/JP2004/012829
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English (en)
Japanese (ja)
Inventor
Shoichiro Seno
Teruko Fujii
Tetsuya Yokotani
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2004/012829 priority Critical patent/WO2006027817A1/fr
Priority to JP2006534930A priority patent/JP4437818B2/ja
Publication of WO2006027817A1 publication Critical patent/WO2006027817A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4645—Details on frame tagging

Definitions

  • the present invention relates to a communication system that performs communication using a layer 2 frame, and particularly to a communication system in which node devices are arranged so as to connect trunk links in a loop shape.
  • L2 switches that switch Ethernet (registered trademark) frames
  • L2 frames L2 switches associate destination MAC addresses with circuit ports.
  • a table called forwarding database is stored, the destination MAC address of the frame header in the L2 frame is compared with the destination MAC address of the forwarding database, the L2 frame forwarding destination line port is selected, and the L2 frame is forwarded To do.
  • the logical topology between the L2 switches which is the L2 frame transfer path, is uniquely determined.
  • the logical topology is changed and the forwarding database is reconfigured. Bypassing obstacles (see Non-Patent Document 1, for example).
  • Non-Patent Document 1 that reconfigures the forwarding database using the spanning tree protocol when a failure is detected, it takes time to change the forwarding database. There was a problem that it was not suitable for bypassing failures in L2 frames equipped with data requiring real-time performance.
  • Patent Document 1 discloses a network in which two transmission paths, a working path and a backup path, are set in advance and can be quickly switched to a backup path when a failure of the working path is detected.
  • a transfer system technique is disclosed. Specifically, a VLAN (Virtual Local Area Network) for frame transfer for the working path and a VLAN for frame transfer for the backup path are set in advance as a VLAN table between the L2 switches. Keep it. During frame transfer, each L2 switch compares the VLAN tag contained in the L2 frame with the set VLAN table and selects the transfer destination line port. Forward through the VLAN.
  • VLAN Virtual Local Area Network
  • Patent Document 2 discloses a technique for quickly switching to a backup path when a failure of the working path is detected when the communication system forms a ring (loop) network.
  • MPLS Multi Protocol Label Switching
  • the MPLS label in the frame is compared with the set label table to select the transfer destination line port, and when a failure in the working path is detected, the frame is prepared. Transfer to the route.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2003-158539
  • Patent Document 2 Japanese Patent Laid-Open No. 2003-224586
  • Non-Patent Document 1 Rich Seifert "LAN switching thorough explanation” Nikkei BP Publishing 20 August 6, 2001
  • each L2 switch or node device uses the L2 frame header information and the forwarding database, or the set VLAN or MPLS label table during frame transfer.
  • the line port to which the L2 frame is forwarded is selected, so that each L2 switch or node device consumes memory for storing the forwarding database, or the table of VLAN or MPLS label.
  • the comparison of the table and the header information of the frame caused a load on the L2 frame transfer processing.
  • a technique for logically defining an L2 frame transfer destination such as a VLAN technique or an MPLS technique, is used in order to reduce the time required for fault bypassing. Since the route and the backup route are set in advance, for each pair of the current route and the backup route, each end point of the current route and the backup route is set. In addition, it is necessary to set a VLAN or MPLS label table on all L2 switches or node devices installed in the middle, which causes problems when network settings become complicated.
  • the present invention has been made in view of the above, and reduces the amount of information set in a node device in a communication system to suppress memory consumption, and transfers at the time of transferring a layer 2 frame
  • the first object is to obtain a communication system and a node device that reduce the processing load for selecting a previous port.
  • a second object of the present invention is to set information on a plurality of pairs of a current path and a backup path using a single control frame when the current path and the backup path are set in advance. It is to obtain a communication system and a node device that are set only for the node devices at the respective end points of and.
  • the present invention provides a plurality of node devices having two trunk ports that accommodate trunk links and one or more branch ports that accommodate branch networks. Connected in a loop shape via the trunk link, and communicates by transmitting the layer 2 frame received from the branch network accommodated in its own device via the trunk link to the branch network accommodated in the node device as the communication partner
  • the node device has a first VLAN identifier indicating a forward path of a loop-shaped trunk link connecting the branch network accommodated by the own device and the branch network accommodated by the counterpart node device.
  • a VLAN setting table in which a second VLAN identifier indicating a route in the direction opposite to the forward direction is set, and a branch network that the device itself accommodates When receiving a layer 2 frame from the branch port, and a control unit that selects the power of transmitting the layer 2 frame received from the forward path using the forward path and the force of transferring using the reverse path Includes a tagged layer 2 frame obtained by adding a VLAN tag including a first or second LVAN identifier indicating the route selected by the control unit to the layer 2 frame, and a trunk link of the selected route.
  • the first and second VLAN identifiers set in the VLAN setting table and the tagged layer 2 frame VL Based on the VLAN identifier set in the AN tag, it is determined whether the tagged layer 2 frame received is addressed to the branch network accommodated by the local device, and the received tagged layer 2 frame is the local device. If it is destined for the branch line network accommodated by the network, the received layer 2 frame with the tagged tag is sent to the branch network via the branch line port, and the received layer 2 frame with the tag is received.
  • a relay unit that transmits the tagged layer 2 frame to the trunk link via a trunk port that is different from the trunk port that received the tagged layer 2 frame. .
  • the communication system accommodates the branch network and the counterpart node device accommodated in the own device set in the VLAN setting table of the relay unit force of the node device connected in a loop shape via the trunk link.
  • the first and second VLAN identifiers indicating the route of the loop-shaped trunk link that connects to the branch network to be connected and the V tag set in the VLAN tag of the Layer 2 frame with VLAN tag received from the trunk port that accommodates the trunk link Since it is judged whether the tagged layer 2 frame received based on the LAN identifier is addressed to the branch network accommodated by the own device, the tagged layer 2 frame is accommodated by the own device.
  • FIG. 1 is a diagram showing an example of a configuration of a communication system according to the present invention.
  • FIG. 2 is a block diagram showing a configuration of the node device shown in FIG.
  • FIG. 3 is a diagram showing a configuration of a layer 2 frame used in a branch network of a communication system according to the present invention.
  • FIG. 4 is a diagram showing a structure of a layer 2 frame used in a trunk link of a communication system according to the present invention.
  • FIG. 5 is a diagram showing the configuration of a control frame for VLAN setting used to set information on a forward path and a reverse path in a node device of a communication system according to the present invention.
  • Fig. 6 is a diagram showing a failure location of the trunk link of the communication system shown in Fig. 1.
  • FIG. 7 is a flowchart for explaining the operation of the node device that is the starting point of the loop.
  • FIG. 8 is a flowchart for explaining the operation of a node device other than the node device that is the starting point of the loop.
  • FIG. 9 is a flowchart for explaining an operation in which a node device transmits an L2 frame received from a branch network accommodated by the node device to a trunk link.
  • FIG. 10 is a flowchart for explaining an operation in which the node device transmits an L2 frame received from the trunk link.
  • FIG. 1 is a diagram showing an example of a configuration of a communication system according to the present embodiment that is useful for the present invention.
  • the communication system of the present embodiment according to the present invention switches the trunk link 1 constituting the loop-shaped network and the Ethernet (registered trademark) frame (hereinafter referred to as L2 frame).
  • L2 frame Ethernet (registered trademark) frame
  • L2 switch layer 2 switch
  • branch network 31- of loop-shaped network accommodated in node device 21-25 35
  • VLAN virtual local area network
  • the forward direction and the reverse direction are references indicating the directions in which the node devices 21-25 transfer L2 frames in a loop-shaped network, and are assumed to be predetermined. For example, with one node device 21 as the base point, all node devices 21 25 are given node numbers that increase in value when the loop-shaped network is circulated in one direction, and the node numbers increase in the ascending order. Transfer is defined as forward, and transfer in descending order is defined as reverse. In the following, the L2 frame transfer on the trunk link 1 will be described assuming that the forward direction and the reverse direction are constantly determined.
  • the node devices 21-25 all have the same function. The function of the node device will be described with reference to the block diagram showing the configuration of the node device 21 shown in FIG.
  • the node device 21 includes n (n is a natural number) branch port ports 101-10 ⁇ that accommodate the branch network 31 and trunk port ports 111 and 112 that accommodate the trunk link 1 between the adjacent node devices 22 and 25.
  • VLAN configuration table 140 that stores VLAN information in the forward and reverse VLANs of the branch network 31 and the pair of branch networks 32—35 accommodated by its own device, and the L2 switch function and the branch spring port 101— 1
  • Controls the operation of the local device such as determining the working route and the backup route with one of the forward route and the reverse route as the working route and the other as the backup route, and switching between the working route and the backup route when a failure is detected.
  • a control unit 130 that determine the working route and the backup route with one of the forward route and the reverse route as the working route and the other as the backup route, and switching between the working route and the backup route when a failure is detected.
  • a control unit 130 determining the working route and the backup route with one of the forward route and the reverse route as the working route and the
  • FIG. 3 is a diagram showing a configuration of the L2 frame 200 used for data transfer between the node devices 21-25 and the branch network 31-35.
  • the L2 frame 200 is It consists of a frame header 201 and data 202.
  • the frame header 201 is a general MAC header defined in Ethernet (registered trademark) and the IEEE 802.3 standard, and header information such as the destination MAC address and the source MAC address of the L2 frame 200 is set. Is done.
  • data 202 data to be transmitted is set.
  • FIG. 4 shows an L2 frame used for data transfer on the trunk link 1 by the node equipment 21-25.
  • FIG. 210 shows the structure of 210 (the layer 2 frame with a tag as said in a claim).
  • a VLAN tag 203 including a VLAN identifier indicating a forward path or a reverse path is added between the frame header 201 and the data 202 of the L2 frame 200 shown in FIG. Yes.
  • FIG. 5 is a diagram showing a configuration of a VLAN setting control frame 300 used for setting information related to the forward route and the backward route in the node devices 21-25.
  • the VLAN setting control frame 300 includes a frame header 301, control information 302, and VLAN information 303.
  • the frame header 301 is a general MAC header defined in Ethernet (registered trademark) and the IEEE 802.3 standard, and header information such as a destination MAC address and a source MAC address is set therein.
  • header information such as a destination MAC address and a source MAC address is set therein.
  • For the destination MAC address a specific value indicating that the VLAN setting control frame 300 is addressed to all the node devices 21-25 on the loop-shaped network is used.
  • control information 302 control information including information for identifying the VLAN setting control frame 300 is set. When a failure is detected, a turn-back flag indicating that a failure has occurred is set.
  • the VLAN information 303 includes m (m is a natural number) pieces of VLAN identifiers of a forward path and a reverse path corresponding to a branch network 31 35 pair and a pair of branch network 31 35 pairs. Consists of field 310.
  • the field 310 includes a route type 311, branch network information 312 and 313, and VLAN identifiers 314 and 315.
  • a route type is set that includes a set of a route in the reverse direction and a route in the forward direction.
  • the branch network information 312 and 313 include a pair of branch lines to be communicated via the trunk link 1.
  • Information to identify network 31-35 is set. Specifically, for example, a set of a combination of a node number assigned to the node device 21-25 and a port number of the branch port 1101-10 ⁇ accommodated by the node device 21-25 is set.
  • the VLAN of the forward route used for transferring the L2 frame 200 to and from the branch network 31 35 set in the branch network information 312 and 313 is identified.
  • the VLAN identifier for identifying the VLAN in the reverse direction and the VLAN identifier for identifying the VLAN in the reverse direction are set.
  • the VLAN identifier 314 is set with the VLAN identifier of the forward route
  • the VLAN identifier 315 is set with the VLAN identifier of the reverse route.
  • Information on the forward and reverse routes to node equipment 21 25 is set by adding a pair of branch networks 31-35 that transfer L2 frame 200 during initial setup of the communication system or during operation of the communication system. Executed when deleting or deleting. Note that the VLAN identifier indicating the forward route and the VLAN identifier indicating the reverse route are set on the loop-shaped network for each branch network 31-35 that transfers the L2 frame 200 when the communication system is initialized. Is selected to be unique.
  • the node device 21 is a node device that is a starting point of a loop when setting information on a forward route and a reverse route
  • the node device 21 generates a VLAN setting control frame 300.
  • the VLAN setting control frame 300 is transmitted to the trunk link 1 using the forward or reverse route.
  • the node device 21 transmits the VLAN setting control frame 300 using the reverse path
  • the VLAN setting control frame 300 is transmitted from the node device 25, the node device 24, the node device 23, and the node device 22 to each other.
  • the node device 21 is reached in order.
  • the node device 21 generates a VLAN configuration control frame 300 for setting the VLAN information of the pair of the branch network 31 and the branch network 33 that sets the VLAN 41 as the forward direction and the VLAN 42 as the reverse direction.
  • VLAN configuration control frame 300 Information for identifying the branch line network 31 is set in the branch line network information 312 of the field 310, and information for identifying the branch line network 33 is set in the branch line network information 313.
  • the VLAN setting control is not performed.
  • the frame 300 is transferred to the next node devices 24 and 23.
  • the node device 23 Since the information set in the branch network information 313 indicates the branch network 33 accommodated by the node device 23, the node device 23 sets VLAN information based on the field 310, and controls VLAN setting The frame 300 is transferred to the next node device 22.
  • the node device 22 Since the node device 22 is different from the branch network 32 accommodated in the information power own device set in the branch network information 312 and 313, the node device 22 does not set the VLAN configuration control frame 300 next. To the node device 21 of the node. By receiving the VLAN setting control frame 300 from the node device 22, the node device 21 recognizes that the VLAN setting has been normally completed.
  • the node device 22 uses the flag indicating the occurrence of loopback in the control information 302 of the VLAN setting control frame 300 to notify the node device 21 that the failure 99 has occurred. Is transmitted to the node device 23 on the other side that has received the control frame 300 for VLAN setting.
  • the node device 23-25 that has received the VLAN setting control frame 300 in which the return flag is set forwards the VLAN setting control frame 300 to the node devices 24, 25, and 21 opposite to the receiving side. To do.
  • the node device 21 recognizes the failure 99 because the return flag is set in the control information 302 of the received VLAN setting control frame 300.
  • node device 2 A failure 99 has occurred between node device 22 and node device 21 after VLAN information is set in 3.
  • the node device 24 sets the return flag in the control information 302 and transfers the control frame 300 for VLAN setting.
  • VLAN information is not set in the node device 23. Therefore, the node device 21 transmits the VLAN setting control frame 300 again in the forward direction. As a result, it is possible to set information regarding the forward path and the reverse path to all node devices existing outside the failure detection range.
  • VLAN identifier indicating the forward path and the VLAN identifier indicating the reverse path are loop-shaped for each pair of all branch network 31 35 that transfers the L2 frame 200 when the communication system is initialized. It shall be selected to be unique on the network.
  • the control unit 130 generates a VLAN setting control frame 300 (see FIG. 5) (step S 100). Specifically, the control unit 130 sets a route type in which the field 310 includes a pair of a forward route and a reverse route in the route type 311. The control unit 130 of the node device 21 sets information for identifying the VLAN setting control frame 300 in the control information 302.
  • the control unit 130 is a node as information for identifying the branch network 3 1 in the branch network information 312.
  • a combination of the node number assigned to the device 21 and the port number of the branch port 101-10 ⁇ of the node device 21 is set, and the node number assigned to the node device 23 as information for identifying the branch network 33 in the branch network information 313 is set.
  • VLAN identifier of VLAN 42 to create field 310.
  • control unit 130 generates a field 310 corresponding to a pair of communicable branch networks, and adds the VLAN information 303 having the generated field 310 power after the control information 302 to control VLAN setting control frames. Generate 300.
  • the control unit 130 transmits the generated VLAN setting control frame 300 to the trunk unit 120 with the relay unit 120. To the main link 1 of the forward route or the reverse route via the first port 111 or the main port 112 (step S110).
  • the relay unit 120 When the VLAN setting control frame 300 is received via the trunk ports 111 and 112 (step S 120), the relay unit 120 outputs the VLAN setting control frame 300 to the control unit 130.
  • the control unit 130 determines whether or not a return flag is set in the control information 302 of the received VLAN setting control frame 300 (step S130). If the return flag is not set, it is recognized that the VLAN information has been set, and the process ends.
  • the control unit 130 When the return flag is set, the control unit 130 outputs the VLAN setting control frame 300 to the relay unit 120, and the relay unit 120 transmits a trunk in a direction different from the direction in which the transmission is first performed.
  • the VLAN setting control frame 300 is transmitted again via the line ports 111 and 112 (step S140). For example, when the VLAN setting control frame 300 is first transmitted from the trunk port 111, the VLAN setting control frame 300 is transmitted via the trunk port 112, and the VLAN setting control frame 300 is transmitted first from the trunk port 112. In this case, the VLAN setting control frame 300 is transmitted to the trunk link 1 via the trunk port 111.
  • the relay unit 120 When the VLAN setting control frame 300 is received via the trunk ports 111 and 112 (step S200), the relay unit 120 outputs the VLAN setting control frame 300 to the control unit 130.
  • the control unit 130 determines whether or not the loopback flag is set in the control information 302 of the VLAN setting control frame 300 (step S201). When the loopback flag is set, the control unit 130 outputs the VLAN setting control frame 300 to the relay unit 120.
  • the relay unit 120 transmits the VLAN setting control frame 300 input from the control unit 130 via the trunk ports 112 and 111 different from the trunk ports 111 and 112 that have received the VLAN setting control frame 300 to the trunk link. 1 is transmitted (step S202). Specifically, when the VLAN setting control frame 300 is received from the trunk port 111, the VLAN setting control frame 300 in which the return flag is set to the trunk port 111 is transmitted to the trunk link 1 to set the VLAN. When the control frame 300 is received from the trunk port 112, the VLAN setting control frame 300 in which the return flag is set in the trunk port 112 is transmitted. Send to
  • control unit 130 examines the field 310 constituting the VLAN information 303 in order from the top and extracts information in order to extract the information in the top field 310 in the VLAN information 303.
  • a pointer is set (step S203).
  • the control unit 130 determines whether or not it indicates the branch network 31-35 accommodated by the information processing apparatus itself set in the branch network information 312 and 31 3 of the field 310 where the pointer is located. (Step S204).
  • the control unit 130 identifies the VLAN identifier in the field 310 where the pointer is located.
  • 314, 315 acquires the VLAN identifier set in setting the forward VLAN and reverse VLAN to VLAN setting table 140 (step S205) o example, the information set in the branch network information 312, the own When the branch line network 31-35 that the device can accommodate is indicated, the branch line network 31-35 indicated by the information set in the branch line network information 313 is paired with the branch line network 31-35 that the device itself accommodates.
  • the VLAN identifier set in VLAN identifier 314 is set in VLAN configuration table 140 for the forward route so that it can be used as a route to the other branch network 31-35. , It sets the VLAN setting table 140 a VLAN identifier that is set to the VLAN identifier 315 for the reverse route.
  • step S206 After setting the forward and reverse routes in the VLAN setting table 140, the control unit 130 or the information power set in the branch network information 312 and 313 of the field 310 where the pointer is located, it is determined whether or not the subsequent field 310 exists in the VLAN information 303 (step S206).
  • the control unit 130 moves the pointer to the subsequent field 310, and the branch network information 312 and 313 of the field 3 10 to which the pointer is moved.
  • Information power set in the own device It is determined whether or not it indicates the branch network 31 35 accommodated by the own device, and the information set in the branch network information 312 and 313 of the field 310 where the pointer is moved is accommodated in the own device. Do When the branch network 31-35 is indicated, the operation of setting the VLAN information in the VLAN setting tape node 140 is repeated until the subsequent field 310 disappears (steps S204-S207).
  • the control unit 130 When the processing of the field 310 in the VLAN information 303 is completed, the control unit 130 outputs the VLAN setting control frame 300 to the relay unit 120.
  • the relay unit 120 transmits the VLAN setting control frame 300 to the trunk link 1 via the trunk ports 111 and 112 different from the trunk ports 111 and 112 that have received the VLAN setting control frame 300 (step S208). That is, when the VLAN setting control frame 300 is received from the trunk port 111, the VLAN setting control frame 300 is transmitted to the trunk link 1 via the trunk port 112, and the VLAN setting control frame 300 is transmitted from the trunk port 112. If received, the VLAN setting control frame 300 is transmitted to the trunk link 1 via the trunk port 111.
  • the relay unit 120 notifies the control unit 130 that the failure has been detected (step S209).
  • the control unit 130 sets a return flag in the control information 302 of the VLAN setting control frame 300, and outputs the VLAN setting control frame 300 in which the return flag is set to the relay unit 120 (step S210).
  • the control unit 130 notifies the relay unit 120 that the VLAN setting control frame 300 in which the return flag is set is transmitted via the trunk ports 111 and 112 that have received the VLAN setting control frame 300.
  • the relay unit 120 transmits the VLAN setting control frame 300 input from the control unit 130 via the trunk ports 111 and 112 notified from the control unit 130 to the trunk link 1 (step S211).
  • the node device 21 25 stores the information on the forward route and the reverse route by the operation for setting the information on the forward route and the reverse route as described above. It shall be set to 140.
  • the node device 21 receives the L2 frame 200 (see FIG. 3) from the branch network 31 to the branch network 33.
  • Node device 21 adds L2 frame with VLAN tag 203 including VLAN identifier indicating the transfer direction (forward or reverse) on trunk link 1 in L2 frame.
  • Frame 210 (see Figure 4) is generated and sent to main link 1. Specifically, the node device 21 sets VLAN 41 to the VLAN tag 203 when transferring the L2 frame 210 in the forward direction, and sets the VLAN tag 203 to VLAN tag 203 when transferring the L2 frame 210 in the reverse direction. Set 42.
  • VLANs 41 and 42 are VLANs in which the branch network 31 and the branch network 33 are paired, they are set in the node device 23 and the node device 21, and are set in the node devices 22, 24, and 25. Not. Therefore, when the node device 21 forwards the L2 frame 210 in the forward direction, the node device 22 forwards the received L2 frame 210 to the next node device 23, and the node device 21 forwards the L2 frame 210 in the reverse direction. In this case, the node devices 25 and 24 transfer the received L2 frame 210 to the next node devices 24 and 23.
  • the VLAN identifier is the VLAN identifier set to the own device.
  • the L2 frame 200 from which the VLAN tag 203 of the received L2 frame 210 is deleted is transmitted to the branch network 33.
  • the node devices 21-25 generate branch network power accommodated by the own device.
  • the received L2 frame 200 is generated by adding the VLAN tag 203 including the VLAN identifier to the received L2 frame 200.
  • the operation of transmitting to the trunk link 1 will be described in detail.
  • the relay unit 120 uses the branch network 31 accommodated by itself and the branch network 32-35 that is a communication partner via the trunk link 1 to send the destination MAC address of the device within the forwarding network (not shown) in the own device. Compare the destination MAC address contained in the frame header 201 of the L2 frame 200 received from the support network 31 with the learning content in the forwarding database, and select whether to transfer the L2 frame 200. Since the operation for determining the branch network 3 2-35 as the transfer destination when transferring the L2 frame 200 is the same as the function of a general L2 switch, a detailed description is omitted.
  • the relay unit 120 refers to the forwarding database (FDB) and transfers the L2 frame 200 to the branch network. 31—35 is determined (Step S 300, S310). Specifically, in the case of the node device 21, the relay unit 120 of the node device 21 includes the destination MAC address and the forwarding database included in the frame header 201 of the L2 frame 200 received from the branch network 31 via the branch port 101-10 ⁇ . Compare with. The relay unit 120 of the node device 21 determines a branch network 32 35 (transfer destination branch network) to which the L2 frame 200 is transferred based on the comparison result.
  • FDB forwarding database
  • the relay unit 120 determines a VLAN corresponding to the forwarding branch network that transfers the L2 frame based on the notification from the control unit 130 (step S320). Specifically, the control unit 130 transfers the L2 frame 210 to the transfer branch network using the forward route VLAN based on the forward and reverse route states set in the control unit 130 in advance. Select whether to transfer the L2 frame 210 to the forwarding branch network using the VLAN of the reverse route, and notify the relay unit 120. For example, the control unit 130 selects a communicable route when only one of the forward and reverse directions is communicable, and when both the forward and reverse routes are communicable. For this, a route with a short transfer distance is selected and notified to the relay unit 120.
  • the relay unit 120 generates an L2 frame 210 in which a VLAN tag 203 including a VLAN identifier indicating the determined VLAN is added to the L2 frame 200 (step S330).
  • the relay unit 120 transmits the L2 frame 210 to the trunk link 1 via the trunk ports 111 and 112 corresponding to the determined VLAN (step S340). For example, if the trunk port 111 accommodates the forward trunk link 1 and the trunk port 112 accommodates the reverse trunk link 1, the relay unit 120 selects the trunk port 111 if the determined VLAN is forward.
  • the L2 frame 210 is transmitted via the trunk port 112 if the determined VLAN is in the reverse direction.
  • the forward route and the reverse route are intermediate routes such as VL AN41 and VLAN 42 that connect the branch network 31 and the branch network 33 of the communication system shown in FIG. Since the node equipment and the main link 1 are not shared, they can be used as a pair of a working route and a backup route without being simultaneously disabled due to a single failure. For example, when VLAN 41 is used as a working route and VLAN 42 is used as a backup route, even if a failure 99 occurs between the node device 21 and the node device 22 as shown in FIG. Then, the transfer of the L2 frame 210 between the branch network 31 and the branch network 33 is switched to the VLAN 41 via the VLAN 42 to realize communication bypassing the failure.
  • the relay unit 120 determines whether or not the VLAN tag 203 in the L2 frame 210 is addressed to the branch network 3135 accommodated by the own device ( Step S400, S410). Specifically, the relay unit 120 searches for a VLAN identifier indicating the VLAN information set in the VLAN setting table 140 using the VLAN identifier set in the VLAN tag 203 as a search key.
  • the relay unit 120 receives the received L2 frame 210 as its own device. It is determined that the address is addressed to the branch network 31 35 that accommodates. As a result of the search, if there is no VLAN identifier that matches the VLAN identifier set in the VLAN tag 203 in the VLAN identifier set in the VLAN setting table, the relay unit 120 has received it. The L2 frame 210 judges that it is not addressed to the branch network 31-35 accommodated by itself.
  • the relay unit 120 deletes the VLAN tag 203 of the L2 frame 210 and generates the L2 frame 200 (step S420). .
  • the relay unit 120 transfers the L2 frame 200 via the destination branch network 31-35, that is, the branch port 101-10 ⁇ of the branch network 31-35 accommodated by the own device (step S430).
  • the relay unit 120 passes through the trunk ports 111 and 112 different from the trunk ports 111 and 112 that have received the L2 frame 210.
  • the L2 frame 210 is transferred to the main link 1 (step S44 0). Specifically, when the L2 frame 210 is received from the trunk port 111, the L2 frame 210 is transferred to the trunk link 1 via the trunk port 112, and when the L2 frame 210 is received from the trunk port 112. The L2 frame 210 is transferred to the trunk link 1 via the trunk port 111.
  • the relay unit 120 of the node devices 21-25 has the VLAN identifier set in the VLAN tag 203 in the L2 frame 210 received from the trunk link 1 and the VLAN setting table.
  • the branch network 31-35 accommodated by its own device is compared with the VLAN identifier which is the VLAN information associated with the branch network 31-35 accommodated by its own device set to 140.
  • the amount of information used to determine whether or not the L2 frame 210 is addressed to the branch network 31 1 to 35 accommodated by its own device is determined based on the conventional forwarding database or VLAN or The amount of information set in the MPLS label table can be reduced, the consumption of the VLAN setting table 140 is suppressed, and the forwarding destination port for forwarding the L2 frame 210 is selected. Processing load can be reduced.
  • the node device 21 that is the starting point of the loop generates the VLAN setting control frame 300, and uses the created VLAN setting control frame 300 using the forward or reverse route of the loop.
  • the node devices 22-25 which are different from the node device 21 that is the starting point, receive the information set in the branch network information 312 and 313 of the control frame 300 for VLAN setting. Only the VLAN identifier in the field 310 indicating the branch network 31—35 is set in the VLAN setting table, and the VLAN setting control frame is sent via a trunk port different from the trunk port that received the VLAN setting control frame 300.
  • VLAN setting control frame 300 which is a control frame, information on a plurality of pairs of working paths and backup paths can be set only in the node devices at the respective end points of the working path and backup paths.
  • the control unit 130 of the node device 21 that is the start point of the loop omits the VLAN identifier 315 and the VLAN identifier set in the VLAN identifier 314 indicates a forward route.
  • the route type indicating whether the force indicates a reverse route is set to the route type 311, and the control unit 130 of the node device 22-25 It is only necessary to identify whether the route is a forward route or a reverse route from the route type 311 and store the VLAN identifier in the VLAN setting table 140.
  • the control unit 130 uses the forward route VLAN to transfer the L2 frame 210 to the forwarding branch network, and uses the reverse route VLAN.
  • the power to select whether to transfer the L2 frame 210 to the transfer branch network and to notify the relay unit 120 is not limited to this.
  • the control unit 130 adds the VLAN identifier of the forward route, the VLAN identifier of the reverse route, the branch network identification information (branch port number) accommodated by its own device, and the communication partner's Set the branch network identification information (node number and branch port number of the communication partner) accommodated by the node device, and route information indicating whether to use the forward route or the reverse route.
  • the relay unit 120 may determine the VLAN corresponding to the forwarding branch network that transfers the L2 frame with reference to the VLAN setting table 140.
  • the communication system according to the present invention is useful for a communication system in which node devices are arranged so as to connect a main line link in a loop shape. It is suitable for communication systems that transfer frames.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

Chacun des appareils de nœuds (21 à 25) compare un identifiant VLAN défini dans une étiquette VLAN dans une trame de couche 2 reçue d’une ligne de jonction (1) avec un identifiant VLAN prédéterminé, qui est une information VLAN associée à un réseau de branche (31 à 35) hébergé par l’appareil de nœud, pour déterminer si la trame de couche 2 reçue est adressée ou non au réseau de branche (31 à 35) hébergé par l’appareil de nœud. Si c’est le cas, l’appareil de nœud (21 à 25) transmet la trame de couche 2 de laquelle l’étiquette VLAN a été enlevée au réseau de branche (31 à 35) hébergé par l’appareil de nœud, et sinon, transmet la trame de couche 2 à une ligne de jonction (1) située dans une direction différente que celle de la ligne de jonction (1) de laquelle la trame de couche 2 a été reçue.
PCT/JP2004/012829 2004-09-03 2004-09-03 Systeme de communication et appareil de nœud WO2006027817A1 (fr)

Priority Applications (2)

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PCT/JP2004/012829 WO2006027817A1 (fr) 2004-09-03 2004-09-03 Systeme de communication et appareil de nœud
JP2006534930A JP4437818B2 (ja) 2004-09-03 2004-09-03 通信システムおよびノード装置

Applications Claiming Priority (1)

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PCT/JP2004/012829 WO2006027817A1 (fr) 2004-09-03 2004-09-03 Systeme de communication et appareil de nœud

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008092045A (ja) * 2006-09-29 2008-04-17 Mitsubishi Electric Corp 伝送システム
JP2013005143A (ja) * 2011-06-15 2013-01-07 Nippon Telegr & Teleph Corp <Ntt> リング型ネットワークシステム、ネットワーク管理装置及びｌ２スイッチ
JP2016092521A (ja) * 2014-10-31 2016-05-23 日立金属株式会社 中継装置及び通信システム
JP2018142810A (ja) * 2017-02-27 2018-09-13 日本電信電話株式会社 終端装置、ネットワークシステム、プログラムおよび通信方法
JP2022103347A (ja) * 2018-03-02 2022-07-07 株式会社日立製作所 通信制御装置及び通信制御システム

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JPS6126346A (ja) * 1984-07-17 1986-02-05 Nippon Telegr & Teleph Corp <Ntt> ル−プネツトワ−ク制御システム
JPH0818590A (ja) * 1994-06-30 1996-01-19 Toshiba Corp ループ式通信システム
JP2003134139A (ja) * 2001-10-22 2003-05-09 Fujitsu Ltd 伝送ユニット及び伝送ネットワーク

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126346A (ja) * 1984-07-17 1986-02-05 Nippon Telegr & Teleph Corp <Ntt> ル−プネツトワ−ク制御システム
JPH0818590A (ja) * 1994-06-30 1996-01-19 Toshiba Corp ループ式通信システム
JP2003134139A (ja) * 2001-10-22 2003-05-09 Fujitsu Ltd 伝送ユニット及び伝送ネットワーク

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008092045A (ja) * 2006-09-29 2008-04-17 Mitsubishi Electric Corp 伝送システム
JP2013005143A (ja) * 2011-06-15 2013-01-07 Nippon Telegr & Teleph Corp <Ntt> リング型ネットワークシステム、ネットワーク管理装置及びｌ２スイッチ
JP2016092521A (ja) * 2014-10-31 2016-05-23 日立金属株式会社 中継装置及び通信システム
JP2018142810A (ja) * 2017-02-27 2018-09-13 日本電信電話株式会社 終端装置、ネットワークシステム、プログラムおよび通信方法
JP2022103347A (ja) * 2018-03-02 2022-07-07 株式会社日立製作所 通信制御装置及び通信制御システム
JP7330329B2 (ja) 2018-03-02 2023-08-21 株式会社日立製作所 通信制御装置及び通信制御システム

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