JP5775473B2 - Edge device redundancy system, switching control device, and edge device redundancy method - Google Patents

Description

  The present invention relates to a technique for switching to a spare edge device when a failure occurs in an active edge device of a network.

  In an IP (Internet Protocol) network, an edge router (hereinafter referred to as an edge device) accommodates subscribers, SIP (Session Initiation Protocol), PPPoE (Point-to-Point Protocol over Ethernet (registered trademark)), MLD. Terminate protocols used for network services such as (Multicast Listener Discovery) and IKEv2 (Internet Key Exchange version 2) to provide users with services such as telephone, Internet connection, video distribution, and VPN (Virtual Private Network) connection. Have a role to play. Therefore, the edge device holds initial setting information represented by a device ID for identifying the device and a maintenance IF (interface) address, and individual user individual setting information represented by a protocol termination IF (interface) for each user. doing.

  The initial setting information of the edge device is referred to as configuration (hereinafter referred to as “config”), and in the configuration, in particular, user-specific settings are referred to as service order (hereinafter referred to as “SO”). The initial setting information basically does not change after the apparatus is activated. However, the initial setting information is generally input from the operation system or maintenance personnel, even during service provision, each time a contract with the user (for example, new addition, deletion, service change, etc.) Is done.

  In addition to the configuration, the edge device holds path information generated when assigning an IP address to a communication terminal to be connected, session information generated when terminating a protocol, sequence number information of packets to be transmitted and received, and the like. The holding information that is not described in the config, such as route information, session information, and sequence number information, is referred to as dynamic information.

As described above, the edge device has, as the protocol setting information, (1) a configuration to be initially set, (2) SO based on a user contract or the like (generally managed together with the configuration inside the device) , (3) dynamic information.
In general, in order to improve service reliability, a spare edge device (hereinafter also referred to as a spare device) is provided for redundancy in preparation for the occurrence of a failure in the current edge device (hereinafter also referred to as a current device). To be done. In this case, in order to provide the service continuously, it is necessary to take over the setting information items (1) to (3) immediately before the failure to the spare edge device.

  As an example of a redundant configuration, a system (hereinafter referred to as 1 + 1 configuration) in which one spare device is assigned to one active device is known. In this 1 + 1 configuration, an information synchronization signal is transmitted / received between the devices, and the setting information of the active device is replicated to the spare device in real time. In the redundant configuration, not only the setting information to be copied but also a control signal such as a switching request between the active device and the standby device is included in the information synchronization signal, or RFC5798 (Non-patent Document 1). A method that includes only setting information is used on the assumption that it is combined with a monitoring control technology such as VRRP (Virtual Router Redundancy Protocol) described.

  In VRRP, two or more devices are set to form one VRRP group, and only one of the VRRP groups becomes a master (active) and executes service processing, and the others are slaves ( standby). When normal, the slave receives the VRRP advertisement periodically transmitted from the master, but when the master fails and the VRRP advertisement is not transmitted, the slave reflecting the configuration does not reach the VRRP advertisement. Can automatically become a master (Active) and continue service processing.

RFC 5798, “Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6”

  By the way, as an example of a redundant configuration, there is a system (hereinafter referred to as an N + m redundant configuration) in which m spare devices (N> m> 0) are allocated to N active devices instead of the 1 + 1 configuration. This N + m redundant configuration has a lower equipment cost than the 1 + 1 configuration. However, in the N + m redundancy configuration, it is difficult to always set the settings of all N active devices in the spare device because the spare device has a one-to-one correspondence with the specific active device. For this reason, after detecting a failure of the active device (including not only a failure but also a decrease in processing capacity), the setting information items (1) to (3) are picked up and transmitted to the spare device. That is, there is a possibility that service provision will be adversely affected in the time (switching time) required for switching from the occurrence of a failure of the active device suddenly occurring until the setting of the spare device is completed.

  Therefore, an object of the present invention is to reduce the adverse effect on service provision when a failure occurs in an active edge device in an edge device having an N + m redundancy configuration.

The present invention includes a plurality of edge devices configured in an N + m redundancy configuration by terminating a protocol used for a network service, and a configuration, service order, and dynamic information used by a faulty active edge device . A switching control device configured to switch protocol setting information so that it can be used by a spare edge device, wherein the switching control device is at least connected to the current edge device from the current edge device. It obtains dynamic information edge device is using, a receiving unit that stores setting information of the protocol including the acquired dynamic information in serial憶部, detects a failure of the active edge device When the failure detection unit and the failure detection unit detect the occurrence of a failure in the active edge device, the active edge device in which the failure has occurred Configuration was use, service order, acquires the configuration information of said protocols including dynamic information from the storage unit, a transmission unit for transmitting to said spare edge device, of the preliminary that transmitted the setting information A restart instructing unit that transmits an instruction to restart the edge device to enter the active operation state to the spare edge device.

Further, the present invention terminates the protocol used for the network service and is connected to a plurality of edge devices assembled in an N + m redundancy configuration, and the configuration, service order, and operation used by the faulty current edge device are used . A switching control device that switches protocol setting information including target information so that it can be used by a spare edge device, and acquires at least dynamic information used by the current edge device from the current edge device. Te, a receiving unit for storing setting information of the protocol including the acquired dynamic information in serial憶部, a failure detection unit for detecting failure of the working of the edge device, the fault detection unit of the current when detecting failure of an edge device, configuration generated active edge device of the disorder was using the service o Da, the setting information of the protocol that includes dynamic information is obtained from the storage portion, and a transmission unit that transmits to the spare edge device, and then restart the edge device of the preliminary that transmitted the setting information current A restart instructing unit that transmits an instruction to set the operation state to the spare edge device.

Further, the present invention provides a configuration, service order, and dynamic information used by a plurality of edge devices configured in an N + m redundancy configuration by terminating a protocol used for a network service, and a faulty active edge device . An edge device redundancy method in an edge device redundancy system configured to switch so that protocol setting information including a protocol can be used by a spare edge device, wherein the switching control device is configured to from the edge device acquires the dynamic information at least the working edge device is using, a receiving step for storing setting information of the protocol including the acquired dynamic information in serial憶部, the current A fault detecting step for detecting the occurrence of a fault in the edge device; and in the fault detecting step, If the harm occurs is detected, obtain configuration generated active edge device of the disorder was using, service order, the setting information of the protocol that includes dynamic information from said storage unit, of the preliminary A transmission step for transmitting to the edge device and a restart instruction step for transmitting to the spare edge device an instruction to restart the spare edge device that has transmitted the setting information to enter the active operation state are executed.

According to such a configuration, the switching control unit acquires at least dynamic information from the working of the edge device, since remembers the setting information including the acquired dynamic information, failure in the edge device of the working When this occurs, the setting information of the current edge device up to immediately before the occurrence of the failure can be immediately taken over to the spare edge device. Therefore, it is possible to shorten the time (switching time) required for switching from detection of a failure of the active edge device that occurs unexpectedly until the setting of the spare edge device is completed. That is, in the edge device having the N + m redundancy configuration, when a failure occurs in the active edge device, it is possible to reduce the adverse effect on service provision.

The present invention also provides a plurality of edge devices configured in an N + m redundancy configuration by terminating a protocol used for network services, and protocol setting information used by a faulty active edge device as backup edge devices. An edge device redundancy system configured to be switched so that it can be used in a network, wherein the switching control device sets a protocol used by the current edge device from the current edge device. A receiving unit that acquires information and stores it in a storage unit, a failure detection unit that detects a failure occurrence of the active edge device, and the failure detection unit detects a failure occurrence of the active edge device; A transmission unit that acquires setting information of a protocol used by the active edge device in which a failure has occurred from the storage unit, and transmits the setting information to the spare edge device; An instruction to the serial configuration information to the working operation state by restarting the edge device of the transmitted the preliminary, a restart instruction unit that transmits to the spare edge device, the switching control device, the active edge device The priority is set higher than its own priority, the priority of the spare edge device is set lower than its own priority, and the edge set lower than its own priority based on the magnitude of the priority obtain Bei a preliminary edge device selection unit for selecting a device as the destination of the setting information.

The present invention also provides a plurality of edge devices configured in an N + m redundancy configuration by terminating a protocol used for network services, and protocol setting information used by a faulty active edge device as backup edge devices. An edge device redundancy method in an edge device redundancy system configured to be switched so that it can be used in an edge device redundancy system, wherein the switching control device is used by the current edge device from the current edge device. In the reception step of acquiring the setting information of the protocol being used and storing it in the storage unit, the failure detection step of detecting the failure occurrence of the active edge device, and the failure of the active edge device in the failure detection step When an occurrence is detected, the protocol setting information used by the active edge device in which the failure has occurred is stored in the memory. And transmitting to the spare edge device a transmission step for transmitting to the spare edge device and an instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state. a start instruction step, the switching control device, wherein when selecting said spare edge device that transmits the setting information, set higher than the priority of the own priorities of said active edge device, the preliminary edge priority setting the lower than the priority of the own device, run a preliminary edge device selecting step, the selecting as the destination of the edge device the setting information set lower than the priority of itself.

According to such a configuration, since the switching control apparatus acquires and stores the setting information of the working edge device, when a failure occurs in the working edge device, the current working device up to the time immediately before the failure occurs. The setting information of the edge device can be immediately transferred to the spare edge device. Therefore, it is possible to shorten the time (switching time) required for switching from detection of a failure of the active edge device that occurs unexpectedly until the setting of the spare edge device is completed. That is, in the edge device having the N + m redundancy configuration, when a failure occurs in the active edge device, it is possible to reduce the adverse effect on service provision. Further, the switching control device can execute control for immediately selecting the spare edge device using the priority. That is, since the time required for selecting the spare edge device can be shortened, adverse effects on service provision can be reduced.

  In the present invention, when the failure detection unit detects a failure of the active edge device in the failure detection unit, the spare edge device selection unit sets the priority of the active edge device in which the failure has occurred to its own priority. The priority of the spare edge device that has transmitted the setting information is set higher than its own priority.

  Further, in the spare edge device selection step, when a failure occurrence of the active edge device is detected in the failure detection step, the priority of the active edge device in which the failure has occurred is set as its own priority. The priority of the spare edge device that has transmitted the setting information is set higher than its own priority.

  According to such a configuration, the switching control device can distinguish between the active edge device and the spare edge device using the priority, so that the active edge device in which the failure occurs is It is possible to prevent transition to the operation state. Therefore, adverse effects on service provision can be reduced.

  According to the present invention, in an edge device having an N + m redundancy configuration, when a failure occurs in an active edge device, adverse effects on service provision can be reduced.

It is a figure which shows the structural example and 1st state of an edge apparatus redundancy system. It is a figure which shows the 2nd state in an edge apparatus redundancy system. It is a figure which shows the 3rd state in an edge apparatus redundancy system. It is a figure which shows the structural example of a switching control apparatus. It is a figure which shows the example of a processing sequence.

  A mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings as appropriate.

A configuration example of the edge device redundancy system in this embodiment will be described with reference to FIG.
The edge device redundancy system 1 includes a switching control device 100 and edge devices 10 (10a, 10b, 10c). In FIG. 1, the edge device redundancy system 1 represents a case where N = 2, that is, two of the current edge devices 10a and 10b, and m = 1, that is, one of the spare edge devices 10c, in an N + m redundancy configuration. Yes. However, if N>m> 0, the number of edge devices shown in FIG. 1 is not limited.

  The switching control device 100 and the edge device 10 are communicably connected via a connection line 30 connected to each other. However, no communication is performed between the edge devices 10. The switching control device 100 monitors and controls the entire N + m redundant configuration, and when a failure occurs in the active edge device 10 (hereinafter also referred to as the active device), the standby edge device 10 (hereinafter also referred to as the standby device). .)). For example, a function used in VRRP may be used. Details of the function of the switching control device 100 will be described later.

Of the edge device 10 shown in FIG. 1, it is assumed that two edge devices 10a and 10b are active devices in the active operation state, and one edge device 10c is a standby device in the standby state. The edge device 10 accommodates subscribers and terminates protocols used for network services such as SIP, PPPoE, MLD, IKEv2, and provides services such as telephone, Internet connection, video distribution, and VPN connection to users. It has a function.
The maintenance terminal 20 is communicably connected to the switching control device 100, and is used when a maintenance person inputs configuration and SO into the active device.

  Here, an outline of processing in the edge device redundancy system 1 will be described with reference to FIGS. A case will be described where a VRRP group is set for each edge device 10 between the switching control device 100 and each edge device 10. However, no VRRP group is set between the edge devices 10.

  In FIG. 1, the switching control device 100 receives an information synchronization signal including protocol setting information (config, SO, dynamic information) from the active edge devices 10a and 10b, and holds the received setting information. , Represents the first state. That is, the switching control device 100 always holds setting information of all active devices. Specifically, the switching control device 100 operates as a standby device having a 1 + 1 configuration for each of the active edge devices 10a and 10b. This can be realized, for example, by setting a VRRP group. Then, the switching control device 100 continues to receive the information synchronization signal from the working edge devices 10a and 10b and always keeps the latest contents.

  In the first state, in setting the priority in VRRP, the priority of the switching control device 100 is made lower than the priority of the current edge devices 10a and 10b, so that the current edge devices 10a and 10b become masters. The switching control device 100 becomes a slave. Further, by making the priority of the switching control device 100 higher than the priority of the spare edge device 10c, the switching control device 100 can be a master and the spare edge device 10c can be a slave.

  Next, in FIG. 2, the switching control device 100 detects a failure (including not only a failure but also a reduction in processing capacity) of the active edge device 10b, and switches from the edge device 10b to the spare edge device 10c. , Represents a second state. When the switching control device 100 detects a failure of the active device, the switching control device 100 selects one of the switching destinations from the spare devices m. In FIG. 1, since there is only one spare device 10c, the spare edge device 10c is selected.

  Since the switching control device 100 operates as a master (active device) having a 1 + 1 configuration with respect to the edge device 10c, by transmitting an information synchronization signal to the edge device 10c, the edge device 10b in which a failure has occurred. The setting information immediately before the failure is written to the edge device 10c. After that, the switching control device 100 restarts the edge device 10c to bring it into the active operation state.

  In the second state, in the priority setting in VRRP, the switching control device 100 writes the setting information to the edge device 10c, and then sets the priority of the edge device 10c higher than its own priority. As a result, the edge device 10c can be brought into the active operation state. Further, the switching control device 100 prevents the edge device 10b in which the failure has occurred from being set lower than its own priority, thereby preventing the active operation state from being restored after failure recovery.

  Next, FIG. 3 shows a third state after the switching is completed. The edge device 10a and the edge device 10c that has newly become the active device transmit an information synchronization signal including setting information to the switching control device 100. Then, the switching control device 100 always receives and holds setting information from the active device. That is, it can be said that the third state is the same as the first state in which the switching control device 100 receives the information synchronization signal from the active device.

Next, a function example of the switching control device 100 will be described with reference to FIG. 4 (see FIGS. 1 to 3 as appropriate).
The switching control device 100 includes a processing unit 110 and a storage unit 120. The processing unit 110 includes a reception unit 111, a transmission unit 112, a failure detection unit 113, a spare edge device selection unit 114, a redundancy setting unit 115, and a restart instruction unit 116. Each unit of the processing unit 110 includes a CPU (Central Processing Unit) and a main memory (not shown), and is realized by developing an application program stored in the storage unit 120 in the main memory.

The receiving unit 111 is a communication interface, and has a function of receiving an information synchronization signal including setting information from an active device (active edge devices 10a and 10b) and storing the information synchronization signal in the storage unit 120.
The failure detection unit 113 has a function of detecting the occurrence of a failure in the active device.
The transmission unit 112 is a communication interface. When the failure detection unit 113 detects a failure of the active device, the transmission unit 112 acquires from the storage unit 120 protocol setting information used by the active device in which the failure has occurred. And has a function of transmitting to the spare device (spare edge device 10c).

  The spare edge device selection unit 114 has a function of selecting a spare device when the failure detection unit 113 detects a failure of the active device. Specifically, the spare edge device selection unit 114 selects, for example, the spare device having the highest priority from among the m spare devices based on the priority level assigned in advance. Note that the spare edge device selection unit 114 does not select a spare device when all m spare devices are used. Further, the spare edge device selection unit 114 has a function of controlling the level of priority between the edge device 10 and the switching control device 100.

  The redundancy setting unit 115 has a function of forming a VRRP group or a similar relationship between the edge device 10 and the switching control device 100. Specifically, there is a relationship between the edge device 10 and the switching control device 100 that waits with a higher priority as a master and a lower priority as a slave.

  The restart instructing unit 116 instructs the spare device to restart (to reflect the configuration) so that the setting information transmitted to the selected spare device is reflected in the spare device. A function to transmit the instruction). Note that the restart instruction unit 116 may use the same function provided in the VRRP.

  The storage unit 120 is configured with a hard disk or the like, and stores setting information 121 (121a, 121b,...) Of the protocol used by the active device for each edge device 10.

Next, the processing sequence of the edge device redundancy system 1 will be described with reference to FIG. 5 (see FIG. 4 as appropriate).
In step S501, the active edge devices 10a and 10b transmit an information synchronization signal including protocol setting information to the switching control device 100. The receiving unit 111 of the switching control device 100 activates the same number of information storage instances as the active device, and receives and holds the information synchronization signal from the active device. That is, the switching control device 100 operates as a standby device having a 1 + 1 configuration for each of the active edge devices 10a and 10b. This step S501 corresponds to the first state described above.

  In the first state, the priority of the switching control device 100 is set low for the active edge devices 10a and 10b and high for the spare edge device 10c. This priority is used to determine the order of selection according to the level of the priority when the switching control device 100 selects a spare device as a switching destination while giving a relationship between the master and the slave. In this way, the switching control device 100 operates the edge devices 10a and 10b as the active device and the edge device 10c as the standby device.

In step S502, a failure occurs in the active edge device 10b.
In step S503, the failure detection unit 113 of the switching control device 100 detects the occurrence of a failure in the edge device 10b. Detection of the occurrence of a failure can be achieved by VRRP advertisement failure, failure of response corresponding to periodic polling from the switching control device 100, reception of an autonomous alarm notification from the edge device 10, or the like.

In step S504, the spare edge device selection unit 114 of the switching control device 100 selects the spare edge device 10c.
In step S505, the transmission unit 112 of the switching control device 100 transmits an information synchronization signal that is held by the switching control device 100 and includes the setting information of the failed edge device 10b to the spare edge device 10c.

  In step S506, the spare edge device selection unit 114 of the switching control device 100 performs priority replacement. Specifically, the spare edge device selection unit 114 changes the priority of the edge device 10c to be higher than the priority of the switching control device 100, and transitions the edge device 10c to the active operation state. In addition, the backup edge device selection unit 114 sets the priority of the edge device 10b in which the failure has occurred to be lower than the priority of the switching control device 100, and transitions to the active operation state after the edge device 10b recovers from the failure. To prevent.

In step S507, the edge device 10c is restarted based on an instruction from the restart instruction unit 116 of the switching control device 100, and enters the active operation state. Here, when the VRRP group is set, the edge device 10c automatically transitions to the active operation state when the priority of the edge device 10c is set higher than the priority of the switching control device 100. .
Steps S502 to S507 correspond to the second state described above.

  In step S <b> 508, the active edge devices 10 a and 10 c transmit an information synchronization signal to the switching control device 100. Then, the switching control device 100 activates the same number of information storage instances as the active device, and receives information synchronization signals from the edge devices 10a and 10c. That is, the switching control device 100 operates as a standby device having a 1 + 1 configuration for each of the active edge devices 10a and 10c. This step S508 corresponds to the third state described above.

  As described above, the edge device redundancy system 1 described in the present embodiment is used by a plurality of edge devices 10 configured in an N + m redundancy configuration by terminating a protocol used for a network service, and a faulty active device. And a switching control device 100 that switches the protocol setting information so that it can be used in the spare device. The switching control device 100 acquires from the active device the setting information of the protocol used by the active device and stores it in the storage unit 120, and the failure detection unit 113 that detects the occurrence of a failure in the active device. When the failure detection unit 113 detects the occurrence of a failure in the active device, the transmission unit 112 acquires the protocol setting information used by the active device in which the failure has occurred from the storage unit 120, and transmits the setting information to the standby device. And a restart instructing unit 116 for transmitting an instruction to restart the spare device that has received the setting information to set the active operation state to the spare device. Therefore, since the switching control device 100 can transfer the protocol setting information used by the faulty edge device to the spare edge device in a short time, the switching time can be shortened. Therefore, the edge device redundancy system 1 described in the present embodiment can reduce adverse effects on service provision when a failure occurs in an active edge device in an edge device having an N + m redundancy configuration.

  In the present embodiment, the setting information is described as a set of configuration, SO, and dynamic information. However, in reality, the information synchronization signal transmitted and received between the switching control device 100 and the edge device 10 includes (A) a configuration, SO, and dynamic information as setting information, and (B) SO and There are cases that include dynamic information, and (C) cases that include only dynamic information. This is because the operation system and the maintainer hold the original data of the configuration and SO, so that the switching control device 100 does not acquire the information from the current edge device 10 but acquires it from the operation system. This is because it can be set in the case of setting by the maintenance person or in the setting work of the maintenance person.

Further, in the present embodiment, the case where the VRRP group is used has been described, but it may be realized by a similar function of a redundancy scheme different from VRRP.
Further, when a failure occurs in the active device, if all the spare devices are used and there is no switching destination, the switching control device 100 retains the dynamic information held after the recovery of the failed active device. Is transmitted to the restored active device, the adverse effect on service provision can be reduced.

DESCRIPTION OF SYMBOLS 1 Edge apparatus redundancy system 10 (10a, 10b, 10c) Edge apparatus 100 Switching control apparatus 110 Processing part 111 Reception part 112 Transmission part 113 Fault detection part 114 Spare edge apparatus selection part 115 Redundancy setting part 116 Restart instruction | indication part 120 Memory

Claims (7)

Protocol setting information including configuration, service order, and dynamic information used by multiple edge devices that are configured in an N + m redundancy configuration with a network service terminated protocol and an edge device that has failed An edge device redundancy system comprising a switching control device for switching so that it can be used in a spare edge device,
The switching control device is
From the active edge device, a receiving unit that obtains dynamic information of at least the working edge device is using, and stores the configuration information of the protocol including the acquired dynamic information in serial憶部,
A fault detection unit for detecting a fault occurrence in the active edge device;
When the failure detection unit detects a failure of the active edge device , the protocol setting information including the configuration, service order, and dynamic information used by the active edge device in which the failure has occurred is A transmitting unit that acquires from the storage unit and transmits to the spare edge device;
An instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state, a restart instruction unit that transmits to the spare edge device;
An edge device redundancy system comprising: Protocol setting information used by a plurality of edge devices configured in an N + m redundancy configuration and a current edge device in which a fault has occurred is switched so that the spare edge device can use the protocol used for the network service. An edge device redundancy system comprising a switching control device,
The switching control device is
A receiving unit that acquires setting information of a protocol used by the current edge device from the current edge device and stores it in a storage unit;
A fault detection unit for detecting a fault occurrence in the active edge device;
When the failure detection unit detects a failure occurrence of the active edge device, the spare edge device acquires protocol setting information used by the active edge device in which the failure has occurred from the storage unit. A transmission unit for transmitting to
An instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state, a restart instruction unit that transmits to the spare edge device;
Set higher than its priority the priority of the edge device prior Symbol working, the priority is set lower than the priority of the own of the preliminary edge device, the edge device which is set lower than the priority of the own A spare edge device selection unit to select as a transmission destination of the setting information ;
Rue to said the obtaining Bei the Tsu di device redundant system. The spare edge device selection unit includes:
When a failure occurrence of the active edge device is detected in the failure detection unit,
The priority of the active edge device in which the failure has occurred is set lower than its own priority, and the priority of the spare edge device that has transmitted the setting information is set higher than its own priority. The edge device redundancy system according to claim 2. Protocol that includes the configuration, service order, and dynamic information used by the active edge device where the failure occurred, connected to multiple edge devices configured in an N + m redundancy configuration, terminating the protocol used for network services A switching control device that switches the setting information so that it can be used by a spare edge device,
From the active edge device, a receiving unit that obtains dynamic information of at least the working edge device is using, and stores the configuration information of the protocol including the acquired dynamic information in serial憶部,
A fault detection unit for detecting a fault occurrence in the active edge device;
When the failure detection unit detects a failure of the active edge device , the protocol setting information including the configuration, service order, and dynamic information used by the active edge device in which the failure has occurred is A transmitting unit that acquires from the storage unit and transmits to the spare edge device;
An instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state, a restart instruction unit that transmits to the spare edge device;
A switching control device comprising: Protocol setting information including configuration, service order, and dynamic information used by multiple edge devices that are configured in an N + m redundancy configuration with a network service terminated protocol and an edge device that has failed An edge device redundancy method in an edge device redundancy system comprising: a switching control device for switching so that a spare edge device can be used;
The switching control device is
From the active edge device, a receiving step of at least the working edge device obtains the dynamic information used to store configuration information of said protocol including the acquired dynamic information in serial憶部,
A failure detection step of detecting a failure occurrence of the active edge device;
In the fault detection step, when a fault occurrence of the active edge device is detected, the protocol setting information including the configuration, service order, and dynamic information used by the faulty active edge device . Transmitting from the storage unit and transmitting to the spare edge device;
An instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state, and a reboot instruction step for transmitting to the spare edge device;
An edge device redundancy method characterized in that: Protocol setting information used by a plurality of edge devices configured in an N + m redundancy configuration and a current edge device in which a failure has occurred is switched so that the spare edge device can use the protocol used for the network service. An edge device redundancy method in an edge device redundancy system comprising a switching control device,
The switching control device is
A receiving step of acquiring setting information of a protocol used by the current edge device from the current edge device and storing it in a storage unit;
A failure detection step of detecting a failure occurrence of the active edge device;
In the failure detection step, if a failure occurrence of the active edge device is detected, protocol setting information used by the active edge device in which the failure has occurred is acquired from the storage unit, and the spare A transmitting step for transmitting to the edge device;
An instruction for restarting the spare edge device that has transmitted the setting information to enter the active operation state, and a reboot instruction step for transmitting to the spare edge device;
When selecting an edge device of the preliminary to send pre-Symbol setting information, wherein the priority of the active edge device is set higher than the priority of the own than the priority of the own priority of the spare edge device A spare edge device selection step that sets the edge device that is set low and is set lower than its priority as a transmission destination of the setting information ;
Features and to Rue Tsu di device redundancy method to run. In the preliminary edge device selection step,
When a failure occurrence of the active edge device is detected in the failure detection step,
The priority of the active edge device in which the failure has occurred is set lower than its own priority, and the priority of the spare edge device that has transmitted the setting information is set higher than its own priority. The edge device redundancy method according to claim 6.

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