JP6470199B2 - Communication device, resetting method, and resetting program - Google Patents

Description

  The present invention relates to a communication device, a resetting method, and a resetting program.

  Conventionally, there is a dynamic setting method as a method for registering subscriber information in an edge router. This method is based on a method from a home gateway (HGW) such as a DHCP (Dynamic Host Configuration Protocol) / PPP (Point to Point Protocol) connection method. In a method with a connection request, the edge router and the management server cooperate to set subscriber information in the edge router in response to the connection request.

  A system having such an edge router may have a redundant configuration in which a spare edge router that operates in place of a failed edge router is provided. In such a system, when an edge router fails, switching to a spare edge router is performed. Here, since subscriber information is not set in the spare edge router, it is necessary to set subscriber information.

  The trigger for resetting the subscriber information in the dynamic setting method is a connection request from the HGW. For example, when the HGW user is a DHCP user, DHCP Renew is transmitted as a connection request to the spare edge router. Also, such a reconnection request is sent from the user terminal to the edge router via the HGW in order to request an extension of the IP address lease time when the IP (Internet Protocol) address lease time is halved, for example. Sent.

Masakazu Higashi, Kenji Kimura, Shinya Shirai, “Proposal of Optimal Mounting Method for Subscriber Accommodating Edge in Carrier NW”, IEICE, IEICE Technical Report, NS2013-20, 113 (35), p. 51-55, May, 2013 “Dynamic Host Configuration Protocol”, RFC2131, [online], [searched on January 22, 2016], Internet <https://tools.ietf.org/html/rfc2131>

  However, in the conventional process for resetting the subscriber information, the connection request transmitted to perform the subscriber setting when the edge router breaks down is not sent until the lease time of the IP address is halved. There was a problem that it may take time to reset information.

  In order to solve the above-described problems and achieve the object, the communication device according to the present invention includes a monitoring unit that monitors a communication status of an edge router, and whether the communication status monitored by the monitoring unit satisfies a predetermined condition. A determination unit that determines whether or not, and when the determination unit determines that the communication status satisfies a predetermined condition, a connection request is periodically sent to a spare edge router provided as a spare for the edge router. And a transmitting unit for transmitting automatically.

  The resetting method of the present invention is a resetting method executed by a communication device, wherein a monitoring step for monitoring a communication status of an edge router and the communication status monitored by the monitoring step satisfy a predetermined condition. A determination step for determining whether or not the condition is satisfied, and a connection request to a spare edge router provided as a spare for the edge router when the communication status is determined to satisfy a predetermined condition by the determination step And a transmission step of periodically transmitting.

  The reconfiguration program of the present invention includes a monitoring step for monitoring a communication status of an edge router, a determination step for determining whether or not the communication status monitored by the monitoring step satisfies a predetermined condition, and the determination A transmission step of periodically transmitting a connection request to a spare edge router provided as a spare for the edge router when the communication status is determined to satisfy a predetermined condition by the step; It is made to perform.

  According to the present invention, it is possible to quickly restore user communication.

FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to the first embodiment. FIG. 2 is a diagram for explaining a redundant configuration of the edge router. FIG. 3 is a block diagram showing a configuration of the HGW according to the first embodiment. FIG. 4 is a diagram for explaining the HGW resetting process according to the first embodiment. FIG. 5 is a sequence diagram showing a flow of resetting processing of the communication system according to the first embodiment. FIG. 6 is a block diagram showing the configuration of the HGW according to the second embodiment. FIG. 7 is a diagram illustrating normal traffic and failure traffic. FIG. 8 is a diagram for explaining the HGW resetting process according to the second embodiment. FIG. 9 is a sequence diagram showing a flow of resetting processing of the communication system according to the second embodiment. FIG. 10 is a block diagram showing the configuration of the HGW according to the third embodiment. FIG. 11 is a diagram illustrating a sequence of a keepalive function of a normal SIP session. FIG. 12 is a diagram showing the sequence of the keepalive function of the SIP session when the edge router fails. FIG. 13 is a diagram for explaining the HGW resetting process according to the third embodiment. FIG. 14 is a sequence diagram showing a flow of resetting processing of the communication system according to the third embodiment. FIG. 15 is a diagram illustrating a computer that executes a resetting program.

  Embodiments of a communication device, a resetting method, and a resetting program according to the present application will be described below in detail with reference to the drawings. Note that the communication device, the resetting method, and the resetting program according to the present application are not limited by this embodiment.

[First embodiment]
In the following embodiments, the configuration of the communication system according to the first embodiment, the configuration of the HGW, and the flow of processing of the communication system will be described in order, and finally the effects of the first embodiment will be described.

[Configuration of communication system]
FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to the first embodiment. The communication system 100 according to the first embodiment includes a plurality of HGWs (Home Gateways) 10a to 10c, an edge router 20, a management server 30, a DHCP server 40, and a spare edge router 50. In addition, the number of each apparatus shown in FIG. 1 is an example to the last, and is not restricted to this. In addition, when a plurality of HGWs 10a to 10c are described without particular distinction, they are appropriately described as HGW10.

  The HGWs 10 a to 10 c monitor the communication status of the edge router 20, and when it is determined that the communication status of the edge router 20 satisfies a predetermined condition, the HGW 10 a to 10 c sends a spare edge router 50 provided as a spare for the edge router 20. On the other hand, a connection request packet (trigger packet) is periodically transmitted.

  The edge router 20 is a working edge router, and is a relay device that relays packets transmitted from the HGWs 10a to 10c. The spare edge router 50 operates in place of the edge router 20 when the edge router 20 fails. As described above, the communication system 100 has a redundant configuration that switches to the spare edge router 50 when the failure of the edge router 20 occurs, as shown in FIG.

  For example, in the communication system 100, a user terminal (not shown) transmits a connection request packet (trigger packet) to the edge router 20 via the HGW 10 for realizing a service in a home network. Then, the edge router 20 requests subscriber information to the management server 30 based on the connection request packet when receiving the connection request packet from the user terminal. Subsequently, the management server 30 sets the subscriber information in the edge router 20 based on the subscriber information from the management server 30.

  In addition, as described above, when the failure of the edge router 20 occurs, switching to the spare edge router 50 is performed. However, since subscriber information is not set in the spare edge router 50, it is necessary to set subscriber information. Even when the failure of the edge router 20 occurs, when the connection request packet is received from the user terminal, the subscriber information is requested to the management server 30 based on the connection request packet. For example, in the case of a DHCP user, DHCP Renew is transmitted to the spare edge router 50 as a connection request.

  The management server 30 stores the subscriber information of the user, and sets the subscriber information for the edge router 20 when a request for subscriber information is received from the edge router 20. The DHCP server 40 is a server that automatically issues information such as an IP address to a user terminal.

[Configuration of HGW]
Next, the configuration of the HGW 10 shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of the HGW according to the first embodiment. As illustrated in FIG. 3, the HGW 10 includes an IP communication function unit 11, a monitoring unit 12, a determination unit 13, and a transmission unit 14. The processing of each of these units will be described below.

  The IP communication function unit 11 controls communication related to various information exchanged with the user terminal, the edge router 20, and the like. For example, the IP communication function unit 11 transfers a packet transmitted from a user terminal accessing the network using an assigned IP address to the edge router 20 or forwards a packet transmitted from the edge router 20 to the user terminal. Or

  The monitoring unit 12 monitors the communication status of the edge router 20. Specifically, the monitoring unit 12 monitors reception of the communication confirmation frame transmitted from the edge router, and notifies the determination unit 13 of the reception result of the communication confirmation frame. For example, the monitoring unit 12 monitors communication using Eth-OAM (Ethernet (registered trademark) -Operation Administration and Maintenance) and monitors reception of an Eth-CC (Ethernet Continuity Check), which is a communication confirmation frame.

  The determination unit 13 determines whether or not the communication status monitored by the monitoring unit 12 satisfies a predetermined condition. Specifically, the determination unit 13 receives the reception result of the communication confirmation frame from the monitoring unit 12, and determines whether or not Eth-CC that is the communication confirmation frame is continuously received. If the determination unit 13 determines that the Eth-CC is not continuously received, the determination unit 13 instructs transmission of DHCP Renew as a connection request.

  When the determination unit 13 determines that the communication state satisfies a predetermined condition, the transmission unit 14 periodically transmits a connection request to the spare edge router 50 provided as a spare for the edge router. Specifically, when the determination unit 13 determines that the communication unit 14 has not continuously received a communication confirmation packet and receives a DHCP Renew transmission instruction from the determination unit 13, the transmission unit 14 uses a spare edge. A connection request is periodically transmitted to the router 50.

  Here, the resetting process of the HGW 10 will be described with reference to FIG. FIG. 4 is a diagram for explaining the HGW resetting process according to the first embodiment. As shown in FIG. 4, each of the HGWs 10a to 10c normally monitors communication with Eth-OAM, and when DHCP-Renew is received for a predetermined time and at a fixed interval when Eth-CC is no longer received. By transmitting to the router 50, the subscriber information is reset.

[Processing flow of communication system]
Next, a processing flow of the communication system 100 according to the first embodiment will be described with reference to FIG. FIG. 5 is a sequence diagram showing a flow of resetting processing of the communication system according to the first embodiment.

  As shown in FIG. 5, when communication is performed between the HGW 10 and an ISP (Internet Service Provider) 60, the HGW 10 and the edge router 20 confirm communication by transmitting an Eth-CC to each other. (Steps S101 and S102). Then, when the edge router 20 fails and the Eth-CC is not received, the HGW 10 periodically transmits a DHCP Renew as a trigger packet to the spare edge router 50 as a connection request (step S103). ).

  Then, when the backup edge router 50 receives DHCP Renew as a trigger packet, the spare edge router 50 transmits a subscriber information setting request to the management server 30 (step S104).

  Then, the management server 30 sets subscriber information for the spare edge router 50 as a response to the request for setting subscriber information (step S105). Subsequently, the spare router 50 transmits DHCP Renew to the DHCP server 40 (step S106). Then, the DHCP server 40 transmits DHCP Ack to the spare edge router 50 as a response to DHCP Renew (step S107).

  Then, the spare edge router 50 transfers DHCP Ack to the HGW 10 and assigns an IP address to the user terminal (step S108). The HGW 10 stops the transmission of the DHCP Renew that has been periodically transmitted when the DHCP Ack is received.

[Effect of the first embodiment]
Thus, the HGW 10 according to the first embodiment monitors the communication status of the edge router 20, determines whether or not the monitored communication status satisfies a predetermined condition, and the communication status satisfies the predetermined condition. If it is determined that the condition is satisfied, a connection request is periodically transmitted to a spare edge router 50 provided as a spare for the edge router. Specifically, the HWG 10 monitors the reception of the communication confirmation frame transmitted from the edge router 20, determines whether or not the communication confirmation frame is continuously received, and determines the communication confirmation frame. Is determined to be not continuously received, a connection request is periodically transmitted to the spare edge router 50. In other words, the connection request transmitted to set the subscriber when the edge router 20 breaks down is automatically determined and transmitted on the HGW 10 side without waiting for the lease time to be halved. It is possible to shorten the time required for setting.

[Second Embodiment]
By the way, in the first embodiment, whether or not the communication confirmation frame is continuously received is monitored, and if it is determined that the communication confirmation frame is not continuously received, Although the case where the connection request is transmitted to the edge router 50 has been described, the present invention is not limited to this, and based on the traffic of packets transmitted / received to / from the edge router 20, The connection request may be transmitted.

  Therefore, as a second embodiment, a case where a connection request is transmitted to the spare edge router 50 based on the traffic of received packets and transmitted packets communicated with the edge router 20 will be described below. To do. Note that a description of the same configurations and processes as those in the first embodiment will be omitted.

  First, the configuration of the HGW 10A according to the second embodiment will be described with reference to FIG. FIG. 6 is a block diagram showing the configuration of the HGW according to the second embodiment. As illustrated in FIG. 6, the HGW 10 </ b> A includes an IP communication function unit 11, a monitoring unit 12 </ b> A, a determination unit 13 </ b> A, a transmission unit 14 </ b> A, and a communication confirmation function unit 15. The processing of each of these units will be described below.

  The monitoring unit 12A monitors the traffic of received packets and transmitted packets communicated with the edge router 20. Specifically, the monitoring unit 12A periodically monitors the traffic of received packets and transmitted packets communicated with the edge router 20, and receives a received packet (downstream packet) received from the router 20 as a monitoring result. And the traffic of the transmission packet (uplink packet) transmitted from the HGW 10A to the edge router 20 are notified to the determination unit 13A.

  The determination unit 13A determines whether the communication amount of the received packet is equal to or less than a predetermined threshold and whether the communication amount of the transmission packet is equal to or greater than the predetermined threshold. As a result, if the determination unit 13A determines that the communication amount of the received packet is equal to or smaller than the predetermined threshold value and the communication amount of the transmission packet is equal to or larger than the predetermined threshold value, the determination unit 13A To instruct the execution of the loopback test. Then, the determination unit 13A receives the result of the loopback test from the communication confirmation function unit 15, and instructs the transmission of DHCP Renew as a connection request when the result of the loopback test is failure.

  Here, normal traffic and failure traffic will be described with reference to FIG. FIG. 7 is a diagram illustrating normal traffic and failure traffic. In the example of the graph illustrated in FIG. 7, the vertical axis indicates “traffic” of transmission / reception packets communicated between the HGW 10 </ b> A and the edge router 20, and the horizontal axis indicates “time”. Further, it is assumed that the thick line indicates the traffic of the received packet (downstream packet) received by the HGW 10A from the edge router 20, and the dotted line indicates the traffic of the transmission packet (upstream packet) transmitted by the HGW 10A to the edge router 20.

  As shown in FIG. 7, when the edge router 20 fails, there is no received packet traffic. On the other hand, the transmission amount of the transmission packet decreases when the edge router 20 breaks down, but temporarily increases due to a packet retransmission by the user or a connection request.

  In consideration of such a traffic pattern at the time of failure, the determination unit 13A determines whether the communication amount of the received packet is equal to or less than a predetermined threshold and the communication amount of the transmission packet is equal to or greater than the predetermined threshold. If the communication amount of the received packet is equal to or smaller than the predetermined threshold value and the communication amount of the transmitted packet is equal to or larger than the predetermined threshold value, it is determined that the edge router 20 has failed. Note that the method for simply determining the failure of the edge router 20 is not limited to this, and changes in the traffic of received packets and transmitted packets are monitored, and communication of received packets and transmitted packets within a predetermined period. When the amount decreases by a threshold value or more, it may be determined that the edge router 20 has failed. In order to easily determine the failure of the edge router 20, only the amount of received packet traffic may be monitored, and when the number of received packets decreases, it may be determined that the edge router 20 has failed.

  When the determination unit 13A determines that the received packet is equal to or less than the predetermined threshold and the communication amount of the transmission packet is equal to or greater than the predetermined threshold, the transmission unit 14A Send connection requests periodically. Specifically, when receiving a DHCP Renew transmission instruction from the determination unit 13A, the transmission unit 14A periodically transmits a connection request to the spare edge router 50.

  Here, the resetting process of the HGW 10A will be described with reference to FIG. FIG. 8 is a diagram for explaining the HGW resetting process according to the second embodiment. As shown in FIG. 8, each HGW 10a to 10c monitors the traffic of packets transmitted / received to / from the edge router 20, the received packet is equal to or smaller than a predetermined threshold, and the traffic of the transmitted packet is predetermined. When the threshold value is exceeded, DHCP Renew is transmitted to the spare edge router 50 at regular intervals and at regular intervals, thereby resetting subscriber information.

  The communication confirmation function unit 15 performs a loopback test when the determination unit 13A determines that the received packet is equal to or less than a predetermined threshold and the communication amount of the transmission packet is equal to or greater than the predetermined threshold. For example, when the communication confirmation function unit 15 receives an instruction to execute a loopback test from the determination unit 13A, the communication confirmation function unit 15 transmits a test frame to the edge router 20, and the response of the frame is transmitted from the edge router 20 within a predetermined time. Perform a loopback test to test whether it returns.

  As a result, when there is a reply from the edge router 20 to the frame, it is determined that the loopback test result is successful, that is, the edge router 20 has not failed. If no frame is returned from the edge router 20, it is determined that the loopback test result has failed, that is, the edge router 20 has failed. After performing the loopback test result, the communication confirmation function unit 15 notifies the determination unit 13A of the test result.

[Processing flow of communication system]
Next, a processing flow of the communication system according to the second embodiment will be described with reference to FIG. FIG. 9 is a sequence diagram showing a flow of resetting processing of the communication system according to the second embodiment.

  As shown in FIG. 9, when communication is performed between the HGW 10A and the ISP 60, the HGW 10A transmits a received packet whose received packet communicated with the edge router 20 is equal to or smaller than a predetermined threshold value, and A loopback test is executed when the amount of communication exceeds a predetermined threshold (step S201). The HGW 10A periodically transmits a DHCP Renew as a trigger packet to the spare edge router 50 as a connection request when the router 20 fails and the loopback test fails (step S202).

  Then, when the backup edge router 50 receives DHCP Renew as a trigger packet, it transmits a subscriber information setting request to the management server 30 (step S203).

  Then, the management server 30 sets subscriber information for the spare edge router 50 as a response to the request for setting subscriber information (step S204). Subsequently, the spare edge router 50 transmits DHCP Renew to the DHCP server 40 (step S205). Then, the DHCP server 40 transmits DHCP Ack to the spare edge router 50 as a response to the DHCP Renew (step S206). The edge router 50 transfers DHCP Ack to the HGW 10A and assigns an IP address to the user terminal (step S207).

[Effect of the second embodiment]
As described above, the HGW 10A according to the second embodiment monitors the communication amount of the reception packet and the transmission packet communicated with the edge router 20, and the communication amount of the reception packet is equal to or less than a predetermined threshold value. In addition, it is determined whether the communication amount of the transmission packet is equal to or greater than a predetermined threshold. When the HGW 10A determines that the received packet is equal to or smaller than the predetermined threshold and the communication amount of the transmitted packet is equal to or larger than the predetermined threshold, the HGW 10A periodically issues a connection request to the spare edge router 50. To send.

  For this reason, the HGW 10 </ b> A can appropriately determine the failure of the edge router 20 from the amount of received packets and transmission packets communicated with the edge router 20. When the edge router 20 breaks down, the connection request transmitted for subscriber setting is automatically determined and transmitted on the HGW 10A side without waiting for the lease time to be halved. It is possible to shorten the time required for resetting.

[Third embodiment]
By the way, in the second embodiment, the communication amount of packets transmitted / received to / from the edge router 20 or a change in the communication amount is monitored, and a connection request is made to the spare edge router 50 based on the change in the communication amount. However, the present invention is not limited to this. A specific session connected via the edge router 20 is monitored, and it is determined that a response to the connection confirmation has not been made in the specific session. In this case, a connection request may be transmitted to the spare edge router 50.

  Therefore, as a third embodiment, when a specific SIP session (for example, an IP telephone session) connected via the edge router 20 is monitored and it is determined that a response to the connection confirmation is not made in the session. A case where a connection request is transmitted to the spare edge router 50 will be described below. In addition, description is abbreviate | omitted about the structure and process similar to 1st embodiment and 2nd embodiment.

  First, the configuration of the HGW 10B according to the third embodiment will be described with reference to FIG. FIG. 10 is a block diagram showing the configuration of the HGW according to the third embodiment. As shown in FIG. 10, the HGW 10B includes an IP communication function unit 11, a monitoring unit 12B, a determination unit 13B, a transmission unit 14B, and a communication confirmation function unit 15. The processing of each of these units will be described below.

  The monitoring unit 12B monitors a response to the connection confirmation in the session connected via the edge router 20. For example, the monitoring unit 12B monitors the presence or absence of a response of keepalive that is connection confirmation in the SIP session, and notifies the determination unit 13B of the monitoring result.

  The determination unit 13B determines whether or not a response to the connection confirmation has been performed in the session. For example, the determination unit 13B receives the monitoring result from the monitoring unit 12B, and instructs the communication confirmation function unit 15 to execute a loopback test when there is no keepalive response. Then, the determination unit 13B receives the result of the loopback test from the communication confirmation function unit 15, and when the result of the loopback test is failure, instructs the transmission of the DHCP Renew as a connection request.

  Here, the keepalive function will be described with reference to FIGS. 11 and 12. FIG. 11 is a diagram illustrating a sequence of a keepalive function of a normal SIP session. FIG. 12 is a diagram showing the sequence of the keepalive function of the SIP session when the edge router fails.

  As shown in FIG. 11, in a state where a session is established between HGW # 1 and HGW # 2, and a user terminal under HGW # 1 and a user terminal under HGW # 2 are busy, HGW # 1 The re-INVITE is transmitted to the HGW # 2 via the IP network, and the HGW # 2 that has received the re-INVITE transmits 200 OK as a re-INVITE response. In this case, since there is a re-INVITE response, it can be said that the edge router 20 is in a normal state and a failure has not occurred.

  In the example of FIG. 12, a session is established between HGW # 1 and HGW # 2, and the edge router is in a state where a user terminal under HGW # 1 and a user terminal under HGW # 2 are talking. It is assumed that 20 has a failure. In such a case, as shown in FIG. 12, since the re-INVITE transmitted from HGW # 1 does not reach HGW # 2, HGW # 1 cannot receive a response to re-INVITE. The HGW 10B according to the third embodiment transmits a trigger packet when there is no response to re-INVITE.

  If the determination unit 13B determines that a response to the connection confirmation has not been made, the transmission unit 14B periodically transmits a connection request to the spare edge router 50. Specifically, when the transmission unit 14B receives a DHCP Renew transmission instruction from the determination unit 13B, the transmission unit 14B periodically transmits a connection request to the spare edge router 50.

  Here, the resetting process of the HGW 10B will be described with reference to FIG. FIG. 13 is a diagram for explaining the HGW resetting process according to the third embodiment. As shown in FIG. 13, each of the HGWs 10a to 10c monitors the keepalive of the SIP session, and when there is no keepalive response from the edge router 20, the DHCP Renew is sent to the spare edge router 50 at regular intervals at regular intervals. The subscriber information is reset by transmitting to the other party.

[Processing flow of communication system]
Next, a processing flow of the communication system according to the third embodiment will be described with reference to FIG. FIG. 14 is a sequence diagram showing a flow of resetting processing of the communication system according to the third embodiment.

  As shown in FIG. 14, when communication is performed between the HGW 10B and the IP network 70, the HGW 10B transmits re-INVITE to the edge router 20 in the SIP session (step S301), and re-INVITE. When there is no response to, a loopback test is executed (step 302). Then, the HGW 10B periodically transmits a DHCP Renew as a trigger packet to the spare edge router 50 as a connection request when the router 20 fails and the loopback test fails (step S303).

  When the standby edge router 50 is activated when the router 20 breaks down and receives DHCP Renew as a trigger packet, the spare edge router 50 transmits a request for setting subscriber information to the management server 30 (step S304).

  Then, the management server 30 sets subscriber information for the spare edge router 50 as a response to the request for setting subscriber information (step S305). Subsequently, the spare router 50 transmits DHCP Renew to the DHCP server 40 (step S306). Then, the DHCP server 40 transmits DHCP Ack to the spare edge router 50 as a response to the DHCP Renew (step S307). The spare edge router 50 transfers the DHCP Ack to the HGW 10B and assigns an IP address to the user terminal (step S308).

[Effect of the third embodiment]
As described above, the HGW 10B according to the third embodiment monitors the response to the connection confirmation in the session connected via the edge router 20, determines whether the response to the connection confirmation is performed in the session, When it is determined that a response to the connection confirmation has not been made, a connection request is periodically transmitted to the spare edge router 50.

  For this reason, the HGW 10B can easily and appropriately determine the failure of the edge router 20 only by monitoring a specific session. When it is determined that the edge router 20 has failed, the connection request transmitted to perform subscriber setting is automatically determined and transmitted on the HGW 10B side without waiting until the lease time is halved. It is possible to shorten the time required for resetting the subscriber information.

[System configuration, etc.]
Further, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed or arbitrarily distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. Further, all or any part of each processing function performed in each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware by wired logic.

  In addition, among the processes described in this embodiment, all or part of the processes described as being automatically performed can be manually performed, or the processes described as being manually performed All or a part of the above can be automatically performed by a known method. In addition, the processing procedure, control procedure, specific name, and information including various data and parameters shown in the above-described document and drawings can be arbitrarily changed unless otherwise specified.

[program]
FIG. 15 is a diagram illustrating a computer that executes a resetting program. The computer 1000 includes, for example, a memory 1010 and a CPU (Central Processing Unit) 1020. The computer 1000 also includes a hard disk drive interface 1030, a disk drive interface 1040, a serial port interface 1050, a video adapter 1060, and a network interface 1070. These units are connected by a bus 1080.

  The memory 1010 includes a ROM (Read Only Memory) 1011 and a RAM (Random Access Memory) 1012. The ROM 1011 stores a boot program such as BIOS (Basic Input Output System). The hard disk drive interface 1030 is connected to the hard disk drive 1090. The disk drive interface 1040 is connected to the disk drive 1100. For example, a removable storage medium such as a magnetic disk or an optical disk is inserted into the disk drive 1100. The serial port interface 1050 is connected to a mouse 1051 and a keyboard 1052, for example. The video adapter 1060 is connected to the display 1061, for example.

  The hard disk drive 1090 stores, for example, an OS 1091, an application program 1092, a program module 1093, and program data 1094. That is, a program that defines each process of the HGW 10 is implemented as a program module 1093 in which a code executable by a computer is described. The program module 1093 is stored in the hard disk drive 1090, for example. For example, a program module 1093 for executing processing similar to the functional configuration in the apparatus is stored in the hard disk drive 1090. The hard disk drive 1090 may be replaced by an SSD (Solid State Drive).

  The setting data used in the processing of the above-described embodiment is stored as program data 1094 in, for example, the memory 1010 or the hard disk drive 1090. Then, the CPU 1020 reads the program module 1093 and the program data 1094 stored in the memory 1010 and the hard disk drive 1090 to the RAM 1012 and executes them as necessary.

  The program module 1093 and the program data 1094 are not limited to being stored in the hard disk drive 1090, but may be stored in, for example, a removable storage medium and read out by the CPU 1020 via the disk drive 1100 or the like. Alternatively, the program module 1093 and the program data 1094 may be stored in another computer connected via a network (LAN (Local Area Network), WAN (Wide Area Network), etc.). Then, the program module 1093 and the program data 1094 may be read by the CPU 1020 from another computer via the network interface 1070.

10, 10A, 10B HGW
11 IP communication function unit 12, 12A, 12B monitoring unit 13, 13A, 13B determination unit 14, 14A, 14B transmission unit 20 edge router 30 management server 40 DHCP server 50 spare edge router 60 ISP
70 IP network 100 Communication system

Claims (3)

A monitoring unit that monitors a response to connection confirmation in a session connected via an edge router;
A determination unit that determines whether or not a response to the connection confirmation has been made in the session ;
When it is determined that the response to the connection confirmation has not been performed by the determination unit, a transmission unit that periodically transmits a connection request to a spare edge router provided as a spare for the edge router;
A communication apparatus comprising: A resetting method executed in a communication device,
A monitoring process for monitoring a response to a connection confirmation in a session connected via an edge router;
A determination step of determining whether or not a response to the connection confirmation has been made in the session ;
If it is determined in the determination step that the response to the connection confirmation has not been performed , a transmission step of periodically transmitting a connection request to a spare edge router provided as a spare for the edge router;
The resetting method characterized by including. A monitoring step of monitoring a response to a connection confirmation in a session connected through an edge router;
A determination step of determining whether or not a response to the connection confirmation has been made in the session ;
If it is determined in the determination step that the response to the connection confirmation has not been performed , a transmission step of periodically transmitting a connection request to a spare edge router provided as a spare for the edge router;
Reconfiguration program to make the computer run.

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