JP2010045503A - Packet transfer system and packet transfer method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress influence imposed on a packet transfer system when a high load state is generated in a control apparatus. <P>SOLUTION: A monitoring manager 1 compares a load of each of a plurality of controllers 2-1 to 2-2 with a predetermined value. A comparison result shows that the controller 2-1 has a load larger than the predetermined value, the monitoring manager determines a controller for controlling a transfer apparatus controlled by a controller having a load larger than the predetermined value, from among controllers other than the controller 2-1. The monitoring manager 1 instructs the transfer apparatus to connect to the determined controller 2-2. The transfer apparatus 3-2 requests connection to the controller 2-2 to which the monitoring manager 1 instructs connection. The controller 2-2 is connected to the transfer apparatus 3-2 having requested connection and controls it. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a packet transfer system and a packet transfer method.

  An IP network using IP (Internet Protocol) packets as an exchange unit can use various services such as e-mail, WWW (World Wide Web), and VoIP, and constitutes a network as compared with a general telephone exchange method. Since the apparatus has advantages such as being inexpensive, its use is rapidly progressing. For this reason, the traffic flowing on the IP network has also increased remarkably.

  The router arranged in each node connected to the IP network determines an output line for outputting the IP packet based on the IP header information of the received packet. As a general router, a software router that determines a packet output line using a CPU connected to an input / output line corresponding unit via a bus has been mainstream. However, in order to cope with a significant increase in traffic, in recent years, IP packet header analysis is performed using hardware, and the input / output line correspondence unit is configured with a high-speed switch, so that packet switching can be performed at high speed. Possible hardware routers are in the spotlight.

  Furthermore, recently, in order to improve the performance of a router, a technique for configuring a router by separating a control signal processing unit and a packet transfer processing unit included in each router has been proposed. Under such a configuration, packet transfer processing can be performed without being affected by the load caused by routing processing.

  Furthermore, the control signal processing unit and the packet transfer processing unit accommodated in the same casing are physically separated and distributed on the network, thereby further improving the flexibility of the device and the functional configuration. An improved function distribution type packet transfer apparatus is disclosed (for example, see Non-Patent Document 1).

In the function-distributed packet transfer device disclosed in Non-Patent Document 1, one control signal processing unit among a plurality of control signal processing units distributed and arranged on a network includes a plurality of packet transfer processing units. Among them, the settings of the packet transfer processing units dynamically combined by setting the control protocol session are managed in an integrated manner. Thereby, the control signal processing unit and the entire packet transfer processing unit coupled to each other logically operate as one packet transfer device.
T. T. V. Lakshman, T .; Nandagopal, R.A. Ramjee, K .; Sabnani, and T.M. Woo, “The SoftRouter Architecture”, in Proc. ACM SIGCOMM Workshop on Hot Topics in Networking, November 2004

  However, in the function distribution type packet transfer device disclosed in Non-Patent Document 1, a plurality of packet transfer processing devices (hereinafter referred to as “transfer devices”) on which a plurality of packet transfer processing units respectively operate are intensively controlled. When a high load state occurs in a server (control signal processing device; hereinafter referred to as “control device”) on which the control signal processing unit operates, path control processing is performed on all transfer devices controlled by the server (control device). Delays and timeouts will occur. Therefore, the influence on the entire packet transfer system constituted by the transfer device and the control device becomes extremely large, and there is a problem that the reliability due to load distribution of the server cannot be increased.

  An object of this invention is to provide the packet transfer system and the packet transfer method which solve the subject mentioned above.

  In order to solve the above problems, a packet transfer system of the present invention is configured to transfer an input packet based on a routing table indicating a communication path of the packet, and to be connectable to the transfer device. When connected to the transfer device, in a packet transfer system comprising a plurality of control devices that control the transfer device and a monitoring manager that monitors the load state of the plurality of control devices, the monitoring manager Of a plurality of control devices, a comparison unit that compares a load of a control device connected to the transfer device and a predetermined value, and if the load is larger than the predetermined value as a result of the comparison, the transfer device is connected A determination unit that determines a control device other than the determined control device as a control device that controls the transfer device; and a connection that instructs the transfer device to connect to the determined control device. An instruction unit, and when the transfer device is instructed to connect to the determined control device from the monitoring manager, the transfer device has a connection request unit that makes a connection request to the control device. When a connection request is made from the transfer device, the transfer device has a control unit connected to the transfer device.

  Further, in the packet transfer system of the present invention, the control device includes an operation information transmission unit that transmits operation information for controlling the transfer device to the monitoring manager when connected to the transfer device. The control unit controls the transfer device using the operation information transmitted from the monitoring manager when the determining unit determines the control device that controls the transfer device, and the monitoring manager You may have the operation information transmission part which transmits the operation information transmitted from the control apparatus connected with the transfer apparatus to the control apparatus which the said determination part determined.

  In order to solve the above problems, a packet transfer method of the present invention is configured to transfer an input packet based on a route table indicating a communication route of the packet, and to be connectable to the transfer device, When connected to a transfer device, a packet transfer method in a packet transfer system comprising a plurality of control devices for controlling the transfer device and a monitoring manager for monitoring a load state of the plurality of control devices, A process in which the monitoring manager compares a load of a control device connected to the transfer device with the predetermined value among the plurality of control devices, and the monitoring manager determines that the load is greater than the predetermined value as a result of the comparison. A control process other than the control device connected to the transfer device is determined as a control device that controls the transfer device, and the monitoring management Processing for instructing the transfer device to connect to the determined control device, and when the transfer device is instructed by the monitoring manager to connect to the determined control device, a connection request to the control device And a control process for connecting the transfer device to the transfer device when the transfer device requests connection.

  Further, in the packet transfer method of the present invention, when the control device is connected to the transfer device, a process of transmitting operation information for controlling the transfer device to the monitor manager; And a process of transmitting operation information transmitted from the control device connected to the transfer device to the control device determined in the determination process. In the control process, the transfer device is controlled by the determination process. When the control device is determined to be the control device, the transfer device may be controlled using the operation information transmitted from the monitoring manager.

  According to the present invention, a transfer device that transfers an input packet based on a route table indicating a packet communication route, and the transfer device are configured to be connectable. When the transfer device is connected, the transfer device is controlled. In a packet transfer system comprising a plurality of control devices and a monitoring manager for monitoring the load state of the plurality of control devices, the monitoring manager is a load of a control device connected to the transfer device among the plurality of control devices. When the load is larger than the predetermined value as a result of the comparison, a control device other than the control device connected to the transfer device is determined as a control device that controls the transfer device, and Instruct the connection to the determined control device. When the transfer device is instructed to connect to the control device determined by the monitoring manager, the transfer device issues a connection request to the control device. Further, when a connection request is made from the transfer device, the control device connects to the transfer device.

  With such a configuration, even when a high load state occurs in the server functioning as the control device, the influence on the entire packet transfer system can be suppressed, and as a result, reliability due to load distribution of the server can be increased.

  Hereinafter, a packet transfer system (including a packet transfer method) according to an embodiment of the present invention will be described.

  First, the overall configuration of the packet transfer system of this embodiment that constitutes an IP network will be described.

  As shown in FIG. 1, the present packet transfer system includes a monitoring manager 1, control devices 2-1 to 2-2, and transfer devices 3-1 to 3-3.

  The numbers of the control devices 2-1 to 2-2 and the transfer devices 3-1 to 3-3 may be arbitrary. Further, the control devices 2-1 to 2-2 or the transfer devices 3-1 to 3-3 are not limited to being configured by independent housings, but have a configuration accommodated in the same housing. Also good.

  The monitoring manager 1 monitors the load state of the control devices 2-1 to 2-2.

  Each of the control devices 2-1 to 2-2 is configured to be connectable to each of the transfer devices 3-1 to 3-3 and controls the transfer devices 3-1 to 3-3 connected to itself. .

  1 indicates that the control device 2-1 and the transfer devices 3-1 to 3-2 are connected by the control protocol session CPS, and the control device 2-2 and the transfer device 3-3 are connected to each other. Is connected by the control protocol session CPS. That is, the control device 2-1 controls the transfer devices 3-1 to 3-2, and the control device 2-2 controls the transfer device 3-3.

  Here, the control protocol session CPS is a session used for communication when the control devices 2-1 to 2-2 control the transfer devices 3-1 to 3-3.

  The transfer devices 3-1 to 3-3 accommodate a plurality of input lines and a plurality of output lines, respectively. The transfer apparatuses 3-1 to 3-3 are, for example, routers, and output lines that are accommodated by the packets based on the route table in which communication paths are indicated, for packets transmitted from the input lines accommodated by the transfer apparatuses 3-1 to 3-3. The role of forwarding to at least one of the

  Next, the configuration of the monitoring manager 1 shown in FIG. 1 will be described in detail.

  As illustrated in FIG. 2, the monitoring manager 1 includes a communication unit 11, a comparison unit 12, a determination unit 13, a control instruction unit 14, a connection instruction unit 15, and a storage unit 16.

  The communication unit 11 receives the load information LD1 to LD2 transmitted from the control devices 2-1 to 2-2.

  Here, the “load information LD1 to LD2” refers to a usage rate of a CPU (Central Processing Unit) included in each of the control devices 2-1 to 2-2, power consumption of the control devices 2-1 to 2-2, and the like. It is information to show.

  Further, the communication unit 11 receives the operation information OP1 to OP2 transmitted from the control devices 2-1 to 2-2.

  Here, the “operation information OP1 to OP2” includes, for example, routing information RT1 to RT2 (“route table”) for transferring a packet by a transfer device controlled by each of the control devices 2-1 to 2-2. Includes each.

  The “operation information OP1 to OP2” is, for example, a transfer device (for example, an IP address assigned to the transfer device) controlled by each of the control devices 2-1 to 2-2 or a connection form of the transfer device ( Control information MG1 and MG2 indicating topology etc.). In the example illustrated in FIG. 1, the control device 2-1 transmits control information MG <b> 1 indicating the transfer devices 3-1 to 3-2 controlled by itself. In the example illustrated in FIG. 1, the control device 2-2 transmits control information MG2 indicating the transfer device 3-3 controlled by itself. Note that the control devices 2-1 to 2-2 hold operation information OP1 to OP2 during the steady operation.

  Further, the communication unit 11 transmits a control instruction to the control devices 2-1 to 2-2.

  Here, the “control instruction” is a signal for instructing control devices other than the control device in the high load state to control the transfer device controlled by the control device in the high load state.

  Here, the “high load state” means that in the control device connected to the transfer device, the speed of processing of the transfer device is significantly delayed or a timeout occurs due to the delay.

  Further, the communication unit 11 (“operation information transfer unit”) is in a high load state when transmitting a control instruction to a control device that is not in a high load state (the control device 2-2 in the example of FIG. 1). Operation information (operation information OP1 in the example of FIG. 1) about the control device (control device 2-1 in the example of FIG. 1) is transmitted.

  Further, the communication unit 11 transmits a connection instruction to the transfer devices 3-1 to 3-3.

  Here, the “connection instruction” is a signal for instructing connection to the control device determined by the determination unit 13.

  The comparison unit 12 loads each load indicated by the load information LD1 or LD2 transmitted from each of the control devices connected to the transfer device, and a load reference value (a criterion for determining whether or not the control device is in a high load state). “Predetermined value”).

  Each of the control devices 2-1 to 2-2 may be configured to transmit different load information. For example, the control device 2-1 may be configured to transmit each usage rate of the CPU and the memory as the load information LD1, and the control device 2-2 may transmit only the power consumption as the load information LD2. In this case, the comparison unit 12 calculates the load of each control device 2-1 or 2-2 using the value included in each load information LD1 or LD2, and then compares it with the load reference value. May be.

  When the comparison unit 12 determines that the load is larger than the load reference value, the determination unit 13 is a control device that is not in a high load state (for example, the control device 2-1) other than the control device that is in a high load state (for example, the control device 2-1). The control device 2-2) is changed to a new control device for controlling the transfer device (the transfer devices 3-1 to 3-2 in the example shown in FIG. 1) controlled by the control device in the high load state. decide.

  The control instruction unit 14 outputs a control instruction to the communication unit 11. The communication unit 11 transmits a control instruction to the new control device determined by the determination unit 13.

  Further, when outputting the control instruction, the control instruction unit 14 reads the operation information OP1 regarding the control device (for example, the control device 2-1) whose load is larger than the load reference value from the storage unit 16. Then, the control instruction unit 14 outputs the read operation information OP1 to the communication unit 11. The communication unit 11 transmits the control instruction and the operation information OP1 to the control device 2-2 determined by the determination unit 13.

  The connection instruction unit 15 is connected to the control device (for example, the control device 2-2 not connected to the transfer devices 3-1 to 3-2) determined by the determination unit 13 in a high load state. The transfer device 3-1 to 3-2 controlled by the control device 2-1 is instructed. When performing the instruction, the connection instruction unit 15 outputs a connection instruction to the communication unit 11. The communication unit 11 transmits a connection instruction to the transfer devices 3-1 to 3-2 via the control device in a high load state.

  The storage unit 16 can store arbitrary information. The storage unit 16 stores, for example, operation information OP1 to OP2 (including routing information RT1 to RT2 and control information MG1 to MG2) transmitted from the control devices 2-1 to 2-2.

  Next, the configuration of the control devices 2-1 to 2-2 shown in FIG. 1 will be described in detail. Since the control devices 2-1 to 2-2 have the same configuration, the configuration of the control device 2-1 will be described below as an example.

  As illustrated in FIG. 3, the control device 2-1 includes a communication unit 21-1, a load measurement unit 22-1, and a control unit 23-1.

  The communication unit 21-1 includes, for example, a communication module, and transmits and receives packets to and from the monitoring manager 1 or the transfer devices 3-1 to 3-3.

  For example, the communication unit 21-1 transmits the load information LD1 output from the load measurement unit 22-1 to the monitoring manager 1.

  Further, the communication unit 21-1 (“operation information transmission unit”) transmits the operation information OP1 output from the control unit 23-1 to the monitoring manager 1. The operation information OP1 includes routing information RT1 and control information MG1.

  In addition, the communication unit 21-1 receives the control instruction transmitted from the monitoring manager 1.

  Further, the communication unit 21-1 receives the connection request transmitted from the transfer devices 3-1 to 3-3. In the example illustrated in FIG. 1, the communication unit 21-1 included in the control device 2-1 receives the connection request transmitted from the transfer device 3-3. In addition, the communication unit 21-2 included in the control device 2-2 receives the connection request transmitted from the transfer devices 3-1 to 3-2.

  The “connection request” is a signal that the transfer devices 3-1 to 3-3 request to connect to the control device 2-1 or 2-2.

  The load measuring unit 22-1 measures the usage rate of the CPU (not shown) included in the control device 2-1 and the power consumption of the control device 2-1, and measures the usage rate and consumption of the measured CPU. Load information LD1 indicating power is output to the communication unit 21-1.

  When the control unit 23-1 executes “control processing” and the transfer apparatuses 3-1 to 3-3 transmit a connection request, the control unit 23-1 connects to the transfer apparatuses 3-1 to 3-3 that have made the connection request. Then, the connected transfer devices 3-1 to 3-3 are controlled.

  Here, the control of the transfer apparatuses 3-1 to 3-3 is to update the information of the transfer apparatus that is controlled by the control apparatus 2-1.

  The above-described control is, for example, performing protocol signal packet termination processing for determining routing information RT1 to RT3 of packets received by the transfer apparatuses 3-1 to 3-3.

  The above-described control is, for example, creating routing information RT1 to RT3 stored in the transfer apparatuses 3-1 to 3-3 by processing protocol signals. In the example illustrated in FIG. 1, each of the transfer devices 3-1 to 3-2 controlled by the control device 2-1 reflects the routing information RT <b> 1 to RT <b> 2 generated by the control unit 23-1 (information generation unit). By doing so, the routing information RT1 to RT2 stored therein is updated.

  In addition, when the monitoring manager 1 transmits the operation information OP2 of the control device 2-2 different from the control device 2-1, the control unit 23-1 (operation setting unit), according to the setting content indicated by the operation information OP2 Change the settings for controlling the transfer device.

  In the example illustrated in FIG. 1, the control unit 23-2 included in the control device 2-2 includes the transfer devices 3-1 to 3-1 controlled by the control device 2-1 according to the setting content indicated by the operation information OP 1. The setting contents of the transfer device are changed so that the control of 3-2 can be performed.

  Next, the configuration of the transfer apparatuses 3-1 to 3-3 shown in FIG. 1 will be described in detail. Since the transfer devices 3-1 to 3-3 have the same configuration, the configuration of the transfer device 3-1 will be described below as an example.

  As illustrated in FIG. 4, the transfer device 3-1 includes a communication unit 31-1, a connection request unit 32-1, a packet input unit 33-1, a packet output unit 34-1, and a transfer processing unit 35-1. And have.

  The communication unit 31-1 receives the connection instruction transmitted from the monitoring manager 1.

  Further, the communication unit 31-1 receives the routing information RT1 transmitted from the control device 2-1 or 2-2. Here, the routing information RT1 is a “route table” for the transfer device 3-1 to transfer the packet.

  The communication unit 31-1 transmits the connection request output from the connection request unit 32-1 to the control device (control device 2-2 in the example of FIG. 1) indicated by the connection instruction.

  The connection request unit 32-1 is connected to the control device (example of FIG. 1) other than the control device (control device 2-1 in the example of FIG. 1) connected from the monitoring manager 1 via the control protocol session CPS. Then, when a connection instruction to the control device 2-2) is transmitted, a connection is requested to the control device 2-2 instructed by the connection instruction.

  The packet input unit 33-1 accommodates a plurality of input lines, and the packet output unit 34-1 accommodates a plurality of output lines. The packet input unit 33-1 and the packet output unit 34-1 constitute an input / output line corresponding unit.

  The transfer processing unit 35-1 stores routing information RT1.

  Further, the transfer processing unit 35-1 outputs the packet received from the input line to at least one output line based on the header information of the packet received from the input line and the routing information RT1.

  Further, the transfer processing unit 35-1 performs a predetermined process on the packet passing through the transfer device 3-1.

  Next, an operation in which the packet transfer system having the above configuration controls the load distribution of the transfer apparatuses 3-1 to 3-3 based on the loads of the control apparatuses 2-1 to 2-2 will be described.

  As shown in FIG. 5, the control device 2-1 transmits the operation information OP1 and the load information LD1 to the monitoring manager 1 (step S1). Here, the operation information OP1 includes the routing information RT1 to RT2 of the transfer devices 3-1 to 2-3, and the control information MG1 indicating the transfer devices 3-1 to 3-2 controlled by the control device 2-1. Including.

  Further, the control device 2-2 transmits the operation information OP2 and the load information LD2 to the monitoring manager 1 (step S2). Here, the operation information OP2 includes routing information RT3 of the transfer device 3-3 and control information MG2 indicating the transfer device 3-3 controlled by the control device 2-2.

  The monitoring manager 1 compares each load indicated by the load information LD1 transmitted from the control device 2-1 or the load information LD2 transmitted from the control device 2-2 with the load reference value. Based on the comparison, the monitoring manager 1 determines whether the control device 2-1 or the control device 2-2 is in a high load state (step S3).

  As a result of the comparison, for example, when the load of the control device 2-1 is larger than the load reference value, it is determined that the control device 2-1 is in a high load state. In this case, the monitoring manager 1 is controlling the control device 2-2 other than the control device 2-1 determined to be in the high load state by the control device 2-1 determined to be in the high load state. It determines to the control apparatus which controls at least one part of the transfer apparatuses 3-1 to 3-2 (step S4). In the example illustrated in FIG. 5, the monitoring manager 1 determines the new control device of the transfer device 3-2 controlled by the control device 2-1 as the control device 2-2.

  Subsequently, the monitoring manager 1 transmits a control instruction to the control device determined as the new control device (step S5).

  Furthermore, the monitoring manager 1 transmits the operation information OP1 transmitted from the control device 2-1 determined to be in the high load state to the control device 2-2 (step S6).

  When the control device 2-2 receives the control instruction, the control device 2-2 controls the transfer device (the transfer device 3-2 in the example of FIG. 5) controlled by the control device 2-1 determined to be in the high load state. As much as possible, setting for transfer device control is performed using the operation information OP1 (step S7).

  The monitoring manager 1 connects at least a part of the transfer device controlled by the control device 2-1 (in the example shown in FIG. 5, the transfer device 3) to the control device 2-2 determined as the new control device. -2). When performing the instruction, the monitoring manager 1 transmits a connection instruction to the transfer device 3-2 (step S8).

  When the transfer device 3-2 receives the connection instruction transmitted from the monitoring manager 1, the transfer device 3-2 transmits a connection request to the control device 2-2 instructed by the connection instruction (step S9).

  When the control device 2-2 receives a transmission request transmitted from the transfer device 3-2, the control device 2-2 newly controls the transfer device 3-2 in addition to the transfer device 3-3 currently controlled by the control device 2-2. Start (step S10).

  Note that, as illustrated in FIG. 6, the control device 2-2 controls the transfer device 3-2 by communicating via the control protocol session CPS.

  With the above, a series of operations for controlling the load distribution of the transfer apparatuses 3-1 to 3-3 by the packet transfer system of the present invention based on the loads of the control apparatuses 2-1 to 2-2 is completed.

  As described above, according to the packet transfer system of the present invention, when the monitoring manager 1 detects the occurrence of a high load state in the control device 2-1, the transfer device controlled by the control device 2-1. At least a part of new control devices 3-1 to 3-2 (control device 2-2 in the example shown in FIG. 6) is newly determined from control devices other than the control device 2-1. Subsequently, the monitoring manager 1 transmits the operation information OP1 received from the control device 2-1 to the control device 2-2 determined as a new control device. The control device 2-2 changes the setting content using the operation information OP1 transmitted from the monitoring manager 1. The monitoring manager 1 transmits a connection instruction to at least a part of the transfer device controlled by the control device 2-1 (transfer device 3-2 in the example of FIG. 6). The transfer device 3-2 that has received the connection instruction transmits a connection request to the control device 2-2 indicated by the connection instruction. The control device 2-2 starts controlling the transfer device 3-2 that has transmitted the connection request.

  Thereby, even when a high load state occurs in the control device connected to the transfer device and controlling the transfer device, it is possible to suppress the influence on the packet transfer system. That is, it is possible to increase the reliability by load distribution of the server (control device).

It is a figure which shows the structure of the packet transfer system according to embodiment of this invention. It is a figure which shows the structure of the monitoring manager shown in FIG. It is a figure which shows the structure of the control apparatus shown in FIG. It is a figure which shows the structure of the transfer apparatus shown in FIG. It is a figure which shows a sequence when a packet transfer system controls the load distribution of a transfer apparatus based on the load of a control apparatus. It is a figure which shows the control state of a transfer apparatus after the packet transfer system shown in FIG. 1 controlled the load distribution of a transfer apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Monitoring manager 11 Communication part 12 Comparison part 13 Determination part 14 Control instruction part 15 Connection instruction part 16 Storage part 2-1, 2-2 Control apparatus 21-1 Communication part 22-1 Load measurement part 23-1 Control part 3- DESCRIPTION OF SYMBOLS 1, 3-2, 3-3 Transfer apparatus 31-1 Communication part 32-1 Connection request part 33-1 Packet input part 34-1 Packet output part 35-1 Transfer process part

Claims (4)

A transfer device that transfers an input packet based on a route table indicating a communication route of the packet, and a plurality of devices that are connectable to the transfer device and control the transfer device when connected to the transfer device A packet transfer system comprising a control device and a monitoring manager for monitoring a load state of the plurality of control devices,
The monitoring manager
Of the plurality of control devices, a comparison unit that compares a predetermined value with a load of the control device connected to the transfer device;
As a result of the comparison, when the load is greater than the predetermined value, a determination unit that determines a control device other than the control device connected to the transfer device as a control device that controls the transfer device;
A connection instruction unit for instructing the transfer device to connect to the determined control device;
The transfer device has a connection request unit that makes a connection request to the control device when instructed to connect to the determined control device from the monitoring manager;
The control device includes a control unit that connects to the transfer device when a connection request is received from the transfer device. The packet transfer system according to claim 1, wherein
The control device includes:
When connected to the transfer device, the device has an operation information transmission unit for transmitting operation information for controlling the transfer device to the monitoring manager;
When the control unit is determined by the determination unit to control the transfer device, the control unit controls the transfer device using operation information transmitted from the monitoring manager,
The monitoring manager
A packet transfer system, comprising: an operation information transfer unit that transmits operation information transmitted from a control device connected to the transfer device to the control device determined by the determination unit. A transfer device that transfers an input packet based on a route table indicating a communication route of the packet, and a plurality of devices that are connectable to the transfer device and control the transfer device when connected to the transfer device A packet transfer method in a packet transfer system comprising a control device and a monitoring manager for monitoring a load state of the plurality of control devices,
A process in which the monitoring manager compares a load of a control device connected to the transfer device and a predetermined value among the plurality of control devices;
A determination process for determining, when the load is greater than the predetermined value as a result of the comparison, a control device other than the control device connected to the transfer device as a control device that controls the transfer device; ,
A process in which the monitoring manager instructs the transfer device to connect to the determined control device;
When the transfer device is instructed by the monitoring manager to connect to the determined control device, a process of making a connection request to the control device;
A packet transfer method comprising: a control process for connecting to the transfer device when the control device requests connection from the transfer device. The packet transfer method according to claim 3, wherein
When the control device is connected to the transfer device, a process of transmitting operation information for controlling the transfer device to the monitoring manager;
The monitoring manager has a process of transmitting the operation information transmitted from the control apparatus connected to the transfer apparatus to the control apparatus determined in the determination process,
In the control process, when it is determined by the determination process to be a control apparatus that controls the transfer apparatus, the transfer apparatus is controlled using the operation information transmitted from the monitoring manager. Method.

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