JP2019047396A - Communication device, communication method, computer program, and communication system - Google Patents

Abstract

To normally switch between a main site and a DR site regarding switching of a service platform of an L3 virtual closed network even if a providing vendor of a communication device used in the main site is different from a providing vendor of a communication device used in the DR site.SOLUTION: A communication device disposed at an edge of an L3 virtual closed network in a DR site includes: a storage unit storing a routing table that is a routing table for a specific closed area and includes a static route which passes through the L3 virtual closed network and goes through a first address allocated to a first interface belonging to the specific closed area in a communication device in a main site; a monitoring unit for monitoring deletion of the static route; and a switching unit for executing a series of processes for the communication device to operate instead of the communication device in the main site triggered by deletion of the static route.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a technology for switching the service base of an L3 virtual closed network.

  For example, in an information system base such as a data center, there is known a technology for achieving redundancy in a main site by providing an active system facility and a spare system facility in the main site. Further, for example, a technology is known in which a DR site (Disaster Recovery site) is provided separately from the main site as an alternative base for replacing the main site when a disaster occurs. Patent Document 1 describes a technique for switching based on the confirmation of the communication state with respect to a plurality of terminal devices connected to the main site, with regard to such switching between the main site and the DR site.

JP, 2015-172895, A

  By the way, a virtual private network (hereinafter referred to as "L3 virtual closed network") service in layer 3 of the OSI reference model is known. In a telecommunications carrier providing such a service, it is assumed that the service infrastructure of the L3 virtual closed network is switched from the main site to the DR site. In such a case, since the vendor providing the communication apparatus used at the main site and the vendor providing the communication apparatus used at the DR site are not necessarily the same, a dedicated function for site switching is provided. There is a problem that it is difficult to incorporate the above into the communication device in advance.

  The present invention has been made in view of the above problems, and relates to switching of the service infrastructure of the L3 virtual closed network, providing a communication device provider used in the main site, and a communication device used in the DR site. An object of the present invention is to provide a technology capable of normally switching between the main site and the DR site even when the vendor is different (hereinafter, also referred to as “multi-vendor environment”).

(1) According to one aspect of the present invention, there is provided a communication device disposed at an edge of an L3 virtual closed network at a DR site. This communication apparatus is a specific closed area routing table, which passes through the L3 virtual closed area network and passes through the first address assigned to the first interface belonging to the specific closed area in the communication apparatus of the main site. Storage unit storing a routing table including a static route, a monitoring unit monitoring the deletion of the static route, and the communication device to the communication device at the main site triggered by the deletion of the static route And a switching unit that executes a series of processes to operate in an alternative manner.

(2) In the communication device according to the above aspect, the switching unit confirms communication with the first address after deletion of the static route, and when the communication can be confirmed, execution of the series of processes is performed. If the communication is canceled and the communication can not be confirmed, the series of processes may be executed.

(3) In the communication device of the above aspect, the series of processing includes processing of enabling an interface connected to an access network outside the L3 virtual closed network in the communication device, and the switching unit is configured to After completion of the enabling process, the communication device at the main site is connected to the access network, and checks the communication for the second address assigned to the second interface belonging to the specific closed area, and the communication is performed If it can be confirmed, the execution of the series of processes may be stopped, and if the communication can not be confirmed, the series of processes may be continued.

(4) In the communication device of the above aspect, the monitoring unit may monitor the deletion of the static route by monitoring a log in which the state of the routing table is recorded.

(5) According to an aspect of the present invention, there is provided a communication method in a device disposed at an edge of an L3 virtual closed network in a DR site. The method comprises the steps of: monitoring deletion of a static route passing through the L3 virtual closed network and passing through a first address assigned to a first interface belonging to a specific closed area in the communication device of the main site; And, when triggered by deletion of a static route, the device executes a series of processes for operating in place of the communication device at the main site.

(6) According to one aspect of the present invention, there is provided a computer program to be executed in an apparatus arranged at an edge of an L3 virtual closed network in a DR site. This computer program has a function of monitoring deletion of a static route passing through the L3 virtual closed network and passing through a first address assigned to a first interface belonging to a specific closed area in the communication device of the main site; With the deletion of the static route as a trigger, a function of executing a series of processes for the device to operate in place of the communication device of the main site is realized.

(7) According to one aspect of the present invention, a communication system is provided. This communication system comprises a main communication device arranged at the edge of the L3 virtual closed network at the main site, and a DR communication device arranged at the edge of the L3 virtual closed network at the DR site. The main communication apparatus is connected to the L3 virtual closed network and belongs to a specific closed area, and is connected to a first interface to which a first address is assigned, and an access network outside the L3 virtual closed network. And a second interface belonging to the specific closed area and assigned a second address, the DR communication device being connected to the L3 virtual closed network and belonging to the specific closed area, A third interface to which an address of 3 is assigned, a fourth interface connected to the access network and belonging to the specific closed area, and a fourth address to which a fourth address is allocated, and a routing table for the specific closed area A static route passing through the L3 virtual closed network from the third interface and passing through the first address; The DR communication device operates in place of the main communication device, triggered by deletion of the static route, and a monitoring unit that monitors deletion of the static route. And a switching unit that executes a series of processes for

(8) In the communication system of the above aspect, after the deletion of the static route, the switching unit of the DR communication device confirms communication with the first address, and if the communication can be confirmed, the series If the execution of the process of is discontinued and the communication can not be confirmed, the series of processes may be executed.

(9) In the communication system of the above aspect, the series of processes includes a process of enabling the fourth interface, and the switching unit of the DR communication apparatus performs the second process after the process of enabling is completed. If the communication with the second address is confirmed and the communication can be confirmed, the execution of the series of processes may be stopped, and if the communication can not be confirmed, the series of processes may be continued.

(10) In the communication system of the above aspect, the monitoring unit of the DR communication device may monitor the deletion of the static route by monitoring a log in which the state of the routing table is recorded.

  The present invention can be realized in various aspects. For example, a communication device, a communication method, a communication system including the communication device, a computer program for realizing the functions of these devices and systems, and the computer program And a non-temporary storage medium storing the computer program.

  According to the present invention, the communication device at the DR site determines that the communication device at the main site has gone down by deleting the static route via the first address assigned to the first interface belonging to the specific closed area. Implement switching from the main site to the DR site. That is, according to the present invention, the communication device at the DR site uses the general-purpose technology such as setting of the closed area, setting of the static route in the routing table, and status monitoring of the routing table. I can know that I went down. As a result, even when the vendor providing the communication apparatus at the main site and the vendor providing the communication apparatus at the DR site are different (in a multi-vendor environment), switching between the main site and the DR site can be performed normally. .

FIG. 1 is a diagram showing a schematic configuration of a communication system according to an embodiment of the present invention. It is a figure which shows schematic structure of DR communication apparatus. It is a figure which shows a part of routing table for SA. It is a figure explaining entry E2 of a routing table for SA. It is a flow chart which shows the procedure of change processing. It is a figure explaining step S10 of change processing. It is a figure explaining step S10 of change processing. It is a figure explaining step S20 of switching processing. It is a figure explaining step S30 of switching processing. It is a figure explaining step S34 of change processing.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

A. Embodiment:
(Configuration of communication system)
FIG. 1 is a diagram showing a schematic configuration of a communication system according to an embodiment of the present invention. The communication system 1000 is a system that functions as a service foundation of a virtual private network (hereinafter referred to as “L3 virtual closed network”) in layer 3 of the OSI reference model. The communication system 1000 according to the present embodiment uses the L3 virtual closed network by using an IP-VPN (Internet Protocol Virtual Private Network), more specifically, an MPLS-VPN (Multi-Protocol Label Switching Virtual Private Network). It has been realized. The communication system 1000 includes an MPLS network 3 and an access network 4.

  The access network 4 is a ring network built on the side of a user (client) who uses the L3 virtual closed network service, and functions as an "access network". The access network 4 includes a plurality of transmission devices 40, 41, 42, 43 arranged in the access network 4. Each transmission apparatus is a known apparatus that performs transmission processing in the physical layer corresponding to layers 1 and 2 of the OSI reference model and the data link layer.

  The MPLS network 3 functions as an “L3 virtual closed network” that realizes a virtual private network by label switching using MPLS. The MPLS network 3 is a network established on the side of a carrier providing L3 virtual closed network service. The MPLS network 3 is arranged at the edge of the MPLS network 3 with a plurality of communication devices 30, 31, 32, 33 arranged in the MPLS network 3, the main communication devices 10, 11 arranged at the edge of the MPLS network 3. And the DR communication device 20. The communication devices 30, 31, 32, 33 are also called P routers, and the main communication devices 10, 11 and the DR communication device 20 are also called PE routers.

  The main communication devices 10 and 11 constitute a main site 1 that provides L3 virtual closed network service in normal times. The main communication device 10 is an active communication device (PE router). Therefore, as shown by the broken arrow in FIG. 1, a packet from a client apparatus (not shown) on the access network 4 is transferred to the MPLS network 3 via the main communication apparatus 10. On the other hand, the main communication device 11 is a spare communication device (PE router). That is, the main communication device 11 has the same configuration and the same IP address as the main communication device 10, and operates in place of the main communication device 10 when a failure occurs in the main communication device 10. Thus, redundancy of the PE router in the main site 1 is achieved by the main communication device 11. The main communication device 11 may be omitted.

  The DR communication device 20 configures a DR site 2 that operates in place of the main site 1 when, for example, the main site 1 becomes unusable due to the occurrence of a disaster or the like. The DR communication device 20 of this embodiment automatically performs a failure of the main site 1 (in other words, that both of the main communication devices 10 and 11 become unusable) by executing the switching process described later. It is possible to automatically start transfer processing which is detected and substituted for the main communication devices 10 and 11 of the main site 1. The DR site 2 is often provided at a remote place from the main site 1.

  Another closed area OA and a closed area SA for monitoring are set in the main communication devices 10 and 11 and the DR communication device 20 using MPLS-VPN. Another closed area OA is a closed area used for L3 virtual closed area network service, and is set for each user who receives service provision. The monitoring closed area SA is a closed area (virtual private network) used for the switching process of the present embodiment. The monitoring closed area SA functions as a "specific closed area".

  In the main communication apparatus 10, an MPLS monitoring IF 101 and an access monitoring IF 102 are set in the monitoring closed area SA. The MPLS monitoring IF 101 is a "first interface" connected to the access network 4, and is assigned a first address. The access monitoring IF 102 is a “second interface” connected to the access network 4 and is assigned a second address. Note that by setting the MPLS monitoring IF 101 and the access monitoring IF 102 as an interface connected to the access network 4, it is possible to detect whether the access network can be used. Similarly, in the main communication apparatus 11, an MPLS monitoring IF 111 and an access monitoring IF 112 are set in the monitoring closed area SA. The MPLS monitoring IF 111 has the same configuration and function as the MPLS monitoring IF 101, and the access monitoring IF 112 has the same configuration and function as the access monitoring IF 102.

  In the DR communication apparatus 20, an MPLS monitoring IF 201 and an access monitoring IF 202 are set in the monitoring closed area SA. The MPLS monitoring IF 201 is a "third interface" connected to the MPLS network 3, and is assigned a third address. The access monitoring IF 202 is a “fourth interface” connected to the access network 4 and is assigned a fourth address. The first to fourth addresses are different IP addresses. Note that the exchange of path information between the main communication device 10 and the DR communication device 20 is performed from the MPLS monitoring IF 101 and the MPLS monitoring IF 201 via the MPLS network 3 (specifically, illustration on the MPLS network 3) Not through the route reflector). The same applies to the main communication device 11. Moreover, in each communication apparatus of FIG. 1, illustration is abbreviate | omitted about the interface set to other closed area OA.

(Configuration of DR communication device)
FIG. 2 is a diagram showing a schematic configuration of the DR communication device 20. As shown in FIG. The DR communication device 20 of this embodiment automatically performs a failure of the main site 1 (in other words, that both of the main communication devices 10 and 11 become unusable) by executing the switching process described later. It detects and automatically starts the transfer processing substituted for the main communication devices 10 and 11 of the main site 1. The DR communication device 20 functions as the “communication device” in claim 1.

  The DR communication apparatus 20 includes a storage unit 210, a CPU 220, a communication unit 200, and a ROM / RAM 230. The respective units are mutually connected by a bus (not shown).

  The storage unit 210 is configured of a hard disk, a flash memory, a memory card, and the like. The storage unit 210 stores an OA routing table 211, an SA routing table 212, and a log 213. The OA routing table 211 is a routing table for another closed area OA (FIG. 1). The SA routing table 212 is a routing table for the monitoring closed area SA (FIG. 1). Details will be described later. The log 213 is a log in which the operation and state of the DR communication device 20 are recorded.

  The CPU 220 controls each unit of the DR communication device 20 by expanding a computer program stored in the ROM into the RAM and executing it. Besides, the CPU 220 also functions as a transfer processing unit 221, a monitoring unit 222, and a switching unit 223.

  The transfer processing unit 221 forms another closed area OA (FIG. 1) by executing data transfer processing based on the OA routing table 211. Further, the transfer processing unit 221 forms a monitoring closed area SA (FIG. 1) by executing data transfer processing based on the SA routing table 212. Note that part or all of the functions of the transfer processing unit 221 may be realized by an application specific integrated circuit (ASIC) or the like provided separately from the CPU 220. For example, in the transfer processing unit 221, data transfer processing based on the OA routing table 211 may be realized by an ASIC, and in the transfer processing unit 221, data transfer processing based on the SA routing table 212 may be realized by the CPU 220. . If AISC is used, high-speed data transfer processing can be realized as compared with the case where CPU 220 is used.

  The monitoring unit 222 detects a failure in the main site 1 by monitoring the log 213 in switching processing described later. The switching unit 223 performs switching from the main site 1 to the DR site 2 in the switching process described later.

  The communication unit 200 controls communication with other communication devices. Other communication devices may include the main communication devices 10 and 11, the communication devices 30 to 33, and the transmission devices 40 to 43 described above, and other devices not described in FIG. The communication unit 200 includes the above-described MPLS monitoring IF 201 and access monitoring IF 202 set in the closed area for monitoring SA, and a plurality of interfaces set in other closed areas OA.

  FIG. 3 shows a part of the SA routing table 212. As shown in FIG. The SA routing table 212 includes the route information of the entries E1 and E2. In FIG. 3, illustration of route information not related to the present invention is omitted. "X", "A", "B" and "C" of FIG. 3 mean arbitrary numbers.

  The entry E1 is path information obtained by the DR communication device 20 learning the path information of the MPLS monitoring IF 101 of the main communication device 10. When the IP address "XX.XXX.XXX.AA / XX" located on the access network 4 is the destination, the entry E1 uses "BGP" as the transfer processing protocol and as the next transfer destination (next hop) It is defined that the MPLS monitoring IF 101 having “XX.XXX.XXX.BB/XX” in the address is used.

  On the other hand, the entry E2 is a static route (static route) used for failure monitoring of the main site 1 in the switching process. The entry E2 uses “Static” as the transfer processing protocol when the arbitrary IP address “XX.XXX.XXX.CC/XX” is the destination, and “XX.XXX.XXX.BB” as the next transfer destination. It is defined to use the MPLS monitoring IF 101 having an address of “/ XX”. The entry E2 is path information used for fault monitoring of the main site 1 as described above. For this reason, the destination of the entry E2 is preferably a dummy IP address that does not exist on the communication system 1000.

  FIG. 4 is a diagram for explaining the entry E2 of the SA routing table 212. As indicated by the broken arrow in FIG. 4, the entry E 2 passes from the MPLS monitoring IF 201 (third interface) of the DR communication apparatus 20 through the MPLS network 3 (L3 virtual closed network) to the main communication apparatus 10. It can be said that a static route passing through the IP address (first address) assigned to the MPLS monitoring IF 101 (first interface) is defined. In FIG. 4, a broken line arrow is also attached to the spare main communication device 11 having the same configuration as the main communication device 10.

(Switching process)
FIG. 5 is a flowchart showing the procedure of the switching process. The switching process is a process executed by the monitoring unit 222 and the switching unit 223 of the DR communication device 20 in cooperation with each other, and is always performed while the DR communication device 20 is operating.

  6 and 7 illustrate step S10 of the switching process. As shown in FIG. 6, it is assumed that the communication devices in both systems (the active system and the spare system) of the main site 1, that is, the main communication device 10 and the main communication device 11 become unusable. If only the main communication device 10 of the active system in the main site 1 becomes unusable, the main communication device 11 of the spare system operates in place of the DR communication. I can not do it.

  If both communication devices in the main site 1 become unusable, the data will not reach the communication devices in both the main site 1 both, so the routing information of the entry E1 obtained by learning is SA routing It is deleted from the table 212 (FIG. 7: upper entry E1). Then, with the deletion of the entry E1, reachability of the static route specified in the entry E2 also disappears. Therefore, the routing information of the entry E2 is also deleted from the SA routing table 212 (FIG. 7: upper entry E2). As a result, a message Er indicating that the static route defined in the entry E2 has been deleted is recorded in the log 213 of the DR communication device 20 (FIG. 7: lower row).

  In step S10 of the switching process (FIG. 5), the monitoring unit 222 monitors the log 213. In step S12, the monitoring unit 222 determines whether or not a message Er (FIG. 7: lower part) indicating that the static route has been deleted is recorded in the log 213. When there is no message Er, the monitoring unit 222 determines that the static route is not deleted (step S12: NO), and continues monitoring the log 213. If there is a message Er, the monitoring unit 222 determines that the static route has been deleted (step S12: YES), and shifts the process to step S20.

  According to steps S10 and S12, the monitoring unit 222 can easily detect the deletion of the static route by monitoring the log 213. The monitoring unit 222 may detect deletion of a static route by a method other than referring to the log 213 (for example, a method of searching the SA routing table 212).

  FIG. 8 is a diagram for explaining step S20 of the switching process. In step S20 of the switching process (FIG. 5), the switching unit 223 carries out a communication check on the MPLS monitoring IFs 101 and 111 of the main site 1. The communication check can be performed, for example, using a ping command to the first address (XX.XXX.XXX.BB/XX) assigned to the MPLS monitoring IFs 101 and 111. This ping command is sent from the MPLS monitoring IF 201 of the DR communication device 20 to the main communication devices 10 and 11 via the MPLS network 3 as indicated by the dashed-dotted arrow in FIG.

  In step S22, the switching unit 223 determines whether communication has been established. If communication is established (step S22: YES), the switching unit 223 determines that deletion of the static route is due to the flapping of the MPLS monitoring IFs 101 and 111 and does not mean that a failure has occurred in the main site 1, and processing To step S10 to continue monitoring the log 213. On the other hand, when not communicating (step S22: NO), the switching unit 223 determines that a failure has occurred in the main site 1, and shifts the process to step S24.

  According to steps S20 and S22, the switching unit 223 can check whether deletion of the static route (message Er) is caused by the failure of the main site 1. Then, the switching unit 223 stops the execution of the alternative process when the communication can be confirmed, and executes the alternative process when the communication can not be confirmed. As a result, the DR communication device 20 can reliably detect a failure in the main site 1 and suppress erroneous execution of the substitution process. Steps S20 and S22 may be omitted.

  In step S24, the switching unit 223 starts the substitution process. The alternative process is a “series of processes” for the DR communication device 20 to operate in place of the main communication devices 10 and 11. First, the switching unit 223 starts the interface (parent interface) to which the access monitoring IF 202 belongs from the stopped state. After that, the switching unit 223 validates each interface set in the access monitoring IF 202 and other closed areas OA. After activation, the switching unit 223 causes the process to transition to step S30. In step S24, various processes other than those described above may be performed.

  FIG. 9 is a diagram for explaining step S30 of the switching process. In step S30 of the switching process (FIG. 5), the switching unit 223 carries out a communication check on the access monitoring IFs 102 and 112 of the main site 1. The communication check can be performed, for example, using a ping command for the second address assigned to the access monitoring IFs 102 and 112. This ping command is sent from the access monitoring IF 202 of the DR communication device 20 to the main communication devices 10 and 11 via the access network 4 as indicated by the dashed dotted arrow in FIG.

  In step S32, the switching unit 223 determines whether or not communication has been established. When the communication is established (step S32: YES), the switching unit 223 determines that the main site 1 is restored (the main communication devices 10 and 11 become usable), and cancels the substitution process. The switching unit 223 may execute the failback process (the process of returning the DR communication device 20 to the standby state) together with the cancellation of the alternative process. Thereafter, the switching unit 223 causes the process to transition to step S10 and continues monitoring of the log 213. On the other hand, when not communicating (step S32: NO), the switching unit 223 determines that the failure of the main site 1 is continuing, and shifts the process to step S34.

  FIG. 10 is a diagram for explaining step S34 of the switching process. In step S34, the switching unit 223 continues to execute the substitution process (a series of processes for the DR communication device 20 to operate in place of the main communication devices 10 and 11). Thereby, as shown by the broken line arrow in FIG. 10, a packet from a client apparatus (not shown) on the access network 4 is transferred to the MPLS network 3 via the DR communication apparatus 20 of the DR site 2. Ru.

  According to steps S30 and S32, the switching unit 223 can confirm the state of the main site 1 again from the side of the access network 4. Then, the switching unit 223 stops the execution of the alternative process when the communication can be confirmed, and continues the alternative process when the communication can not be confirmed (step S34). As a result, the DR communication device 20 can confirm the continuation of the failure of the main site 1 and can prevent the alternative processing from being erroneously continued. Steps S30 and S32 may be omitted. Also, the same processing as steps S30 and S32 may be repeated periodically from step S34.

  As described above, according to the present invention, the communication apparatus (DR communication apparatus 20) at the DR site is assigned to the first interface (MPLS monitoring IF 101, 111) belonging to a specific closed area (closed area for monitoring SA). With the deletion of the static route (entry E2 of the SA routing table 212) via the first address (XX.XXX.XXX.BB/XX), the communication device (main communication devices 10 and 11) of the main site 1 goes down. It is determined that the main site 1 has been switched to the DR site 2 (FIG. 5: step S24). That is, according to the present invention, the communication apparatus at the DR site (DR communication apparatus 20) uses a general-purpose technique such as setting of closed area, setting of static route in the routing table, and status monitoring of the routing table. , It can be known that the communication device of the main site 1 is down. As a result, when the provider of the communication apparatus (main communication apparatuses 10 and 11) of the main site 1 and the vendor of the communication apparatus (DR communication apparatus 20) of the DR site 2 are different (in a multi-vendor environment) Also, switching between the main site 1 and the DR site 2 can be performed normally.

B. Modification:
In each of the above-described embodiments, part of the configuration realized by hardware may be replaced by software, and conversely, part of the configuration realized by software is replaced by hardware. May be Besides, the following modifications are possible.

  In the above embodiment, the main communication devices 10 and 11 and the DR communication device 20 are all described as so-called "physical routers" existing as devices. However, at least a part of the main communication devices 10 and 11 and the DR communication device 20 may be configured as a so-called "virtual router" which virtually provides a routing function. The configuration of the virtual router can be variously used: hardware type, software type, distributed edge type.

  In the above embodiment, the L3 virtual closed network is realized by using the MPLS-VPN, but may be realized by using the EVPN L3 in the MPLS-VPN.

  In the above embodiment, although the apparatus configuration at the main site 1 is configured as two units of the active system and the spare system, various changes can be made. In addition, although the apparatus configuration at the DR site 2 is also configured as one currently used system, various changes can be made.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, each means, functions included in each step, etc. can be rearranged so as not to be logically contradictory, and it is possible to combine or divide a plurality of means, steps, etc. into one. . Further, the structures described in the above embodiments may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Main site 2 ... DR site 3 ... MPLS network 4 ... Access network 10 ... Main communication apparatus 11 ... Main communication apparatus 20 ... DR communication apparatus 30 ... Communication apparatus 40 ... Transmission apparatus 101 ... MPLS monitoring IF
102 ... Access monitoring IF
111 ... MPLS monitoring IF
112 ... Access monitoring IF
200: Communication unit 201: MPLS monitoring IF
202: Access monitoring IF
210 ... storage unit 211 ... routing table for OA 212 ... routing table for SA 213 ... log 220 ... CPU
221 ... transfer processing unit 222 ... monitoring unit 223 ... switching unit 230 ... ROM / RAM
1000 ... communication system OA ... closed area SA ... closed area for monitoring

Claims (10)

A communication device disposed at an edge of an L3 virtual closed network at a DR site,
A routing table for a specific closed area, which is a static route passing through the L3 virtual closed area network and passing through a first address assigned to a first interface belonging to the specific closed area in the communication device at the main site. A storage unit in which a routing table is stored;
A monitoring unit that monitors deletion of the static route;
A switching unit that executes a series of processes for the communication device to operate in place of the communication device at the main site, triggered by deletion of the static route;
A communication device comprising: The communication device according to claim 1,
The switching unit is
After deletion of the static route, confirm communication with the first address,
If the communication can be confirmed, the execution of the series of processes is discontinued;
A communication apparatus that executes the series of processes when the communication can not be confirmed. The communication apparatus according to claim 1 or 2,
The series of processes includes a process of enabling an interface connected to an access network outside the L3 virtual closed network in the communication device,
The switching unit is
After completion of the enabling process, the communication device at the main site confirms communication with a second address that is connected to the access network and assigned to a second interface belonging to the specific closed area.
If the communication can be confirmed, the execution of the series of processes is discontinued;
A communication apparatus which continues the series of processes when the communication can not be confirmed. The communication apparatus according to any one of claims 1 to 3,
The communication unit monitors the deletion of the static route by monitoring a log in which the state of the routing table is recorded. A communication method in a device disposed at an edge of an L3 virtual closed network in a DR site, comprising:
Monitoring deletion of a static route passing through the L3 virtual closed network and passing through a first address assigned to a first interface belonging to a specific closed area in the communication device of the main site;
A step of executing a series of processes for operating the device in place of the communication device at the main site, triggered by deletion of the static route;
A communication method comprising: A computer program executed on a device located at an edge of an L3 virtual closed network in a DR site, comprising:
A function of monitoring deletion of a static route passing through the L3 virtual closed network and passing through a first address assigned to a first interface belonging to a specific closed area in the communication device of the main site;
A function of executing a series of processes for the device to operate in place of the communication device at the main site, triggered by deletion of the static route;
, A computer program. A communication system,
A main communication device disposed at an edge of the L3 virtual closed network at the main site;
A DR communication device disposed at an edge of the L3 virtual closed network at a DR site;
Equipped with
The main communication device is
A first interface connected to the L3 virtual closed network and belonging to a specific closed area and assigned a first address;
A second interface connected to an access network outside the L3 virtual closed network and belonging to the specific closed area and assigned a second address;
Equipped with
The DR communication device is
A third interface connected to the L3 virtual closed network and belonging to the specific closed area and assigned a third address;
A fourth interface connected to the access network and belonging to the specific closed area and assigned a fourth address;
A storage unit storing the routing table for the specific closed area, the routing table including a static route passing through the L3 virtual closed network from the third interface and passing through the first address;
A monitoring unit that monitors deletion of the static route;
A switching unit that executes a series of processes for the DR communication device to operate in place of the main communication device, triggered by deletion of the static route;
A communication system comprising: The communication system according to claim 7, wherein
The switching unit of the DR communication device
After deletion of the static route, confirm communication with the first address,
If the communication can be confirmed, the execution of the series of processes is discontinued;
A communication system that executes the series of processes when the communication can not be confirmed. The communication system according to claim 7 or 8, wherein
The series of processes includes a process of enabling the fourth interface,
The switching unit of the DR communication device
After completion of the enabling process, the communication with the second address is confirmed;
If the communication can be confirmed, the execution of the series of processes is discontinued;
The communication system continues the series of processing if the communication can not be confirmed. The communication system according to any one of claims 7 to 9,
The monitoring unit of the DR communication apparatus monitors deletion of the static route by monitoring a log in which the state of the routing table is recorded.

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