JP2017034558A - System and method for address modification - Google Patents

Abstract

An object of the present invention is to eliminate address duplication efficiently without reducing again the duplication once eliminated in the course of executing the procedure and reducing the processing time. An address management device 10 requests each of a plurality of allocation units to notify the number of terminals connected to each allocation unit, and when the requested information is notified from each allocation unit, Determine a new address that is equal to or more than the number of terminals connected to the assigning unit and does not overlap with the address of any terminal connected to the assigning unit, and notify each of the assigning units not to overlap. To do. The assigning unit changes the address of the terminal based on the notified new address. [Selection] Figure 3

Description

  The present invention relates to an address change system and an address change method.

  With the development of cloud networks, there are increasing cases of constructing a large-scale layer 2 domain including a plurality of layer 2 domains by constructing layer 2 domains in different locations and connecting them via the Internet. In addition, with the spread of data centers and the development of network virtualization technology, there are examples of building data centers in remote locations and improving the efficiency of resources by sharing the built data centers with different layer 2 domains. .

  On the other hand, since it became possible to construct the layer 2 domain as described above, as shown in FIG. 20, the network that had been a separate layer 2 domain until the organizational reorganization was integrated, and a new one was created. An example of constructing a new organization's layer 2 domain can be considered. FIG. 20 is a diagram for explaining integration of subnets. In such a situation, a technology for integrating a plurality of subnets is required.

  With the development of server virtualization technology, as shown in FIG. 21, there has been a case where a virtualized server (VM: Virtual Machine) is operated in a data center that has been conventionally constructed using physical servers. This is because the servers used by different individuals and organizations are virtualized and operated on the same physical server, thereby reducing the number of necessary physical servers. FIG. 21 is a diagram illustrating a configuration of a physical server having a VM. In addition, as shown in FIG. 22, when a physical server is maintained, it is possible to maintain the physical server without stopping the operation of the VM by moving the running VM to another physical server. . FIG. 22 is a diagram for explaining the movement of the VM.

  Here, when data is transferred between each terminal including a VM using Ethernet (registered trademark), a MAC address, for example, is assigned as an address of layer 2 to the interface of each terminal. When the interface is a physical interface, the MAC address is assigned by the management organization and the manufacturer so as not to overlap each other.

  On the other hand, when the terminal is a VM, an address is assigned in the range of an address group assigned to a software manufacturer for operating the VM. Therefore, when software for operating VMs is operating on different servers, there is a possibility that duplicate MAC addresses are allocated between VMs as shown in FIG. FIG. 23 is a diagram for explaining duplication of MAC addresses. Thus, as a method for avoiding duplication of MAC addresses in the same subnet when a new VM is installed, an address duplication avoiding method used by ORACLE VM Server is known (for example, Non-Patent Document 1). .

  In the address duplication avoiding method used by the ORACLE VM Server, software called LDM (Logical Domains Manager) that assigns a MAC address to a VM is used. The LDM assigns a temporary MAC address to the VM when the VM is newly constructed. Then, the LDM detects a VM that exists in the same subnet and uses an address to be allocated. If such a VM is not detected, the LDM uses the assigned temporary MAC as the VM's MAC address, and if detected, determines another MAC address. The LDM assigns an address that is not used by any VM to the VM while repeating the above-described detection operation and temporary address changing operation.

  A method for avoiding address duplication by LDM will be described with reference to FIG. FIG. 24 is a diagram for explaining a conventional address duplication avoiding method. As shown in FIG. 24, as a temporary MAC address, 1 is assigned to the VM 501a, 3 is assigned to the VM 502a, and 1 is assigned to the VM 503a. At this time, the LDM 501 transmits, to each LDM, a message for confirming whether there is a VM having a MAC address of 1 by multicast. Since a message indicating that there is a VM having a MAC address of 1 is returned from the LDM 503, the MAC address of the VM 501a is changed to 2. The LDM repeats these processes until there is no overlap.

"Automatic or manual MAC address assignment", Oracle VM Server for SPARC 2.1 Administration Guide, [online], [Search July 21, 2015], Internet <http://docs.oracle.com/cd/E24622_01 /html/E23595/assignmacaddressesautomaticallyormanually.html>

  However, the conventional address duplication avoidance method using the LDM has a problem that the duplication once eliminated occurs again in the course of executing the procedure, and it takes time to eliminate all duplications, so that the efficiency is poor. .

  For example, when integrating different subnets, VMs using the same MAC address exist as many as the number of integrated subnets. In some cases, a plurality of MAC addresses are duplicated. Therefore, the following problem arises in the address duplication avoidance method using the conventional LDM.

  First, consider a situation where there are a plurality of subnets in which VMs using the same MAC address exist, and these subnets are integrated. Specifically, as shown in FIG. 25, there is a case where both the LDM 601 present in the subnet 600 and the LDM 701 present in the subnet 700 are provided with a VM with a MAC address of 1 and a VM with a MAC address of 2. It is done. 25 and 26 are diagrams for explaining a conventional address duplication avoidance method.

  In the example of FIG. 25, the LDM 601 includes a VM 601a whose MAC address is 1 and a VM 601b whose MAC address is 2. The LDM 701 includes a VM 701a whose MAC address is 1 and a VM 701b whose MAC address is 2. Thus, MAC addresses 1 and 2 are duplicated (step S501 in FIG. 26).

  In order to eliminate duplication, for example, the addresses of VMs 601a and 701a are changed to 3, and the addresses of VMs 601b and 602b are changed to 4. At this time, the two LDMs inquire about the existence of VMs using the MAC addresses 3 and 4 to the other LDM. If this inquiry occurs at the same time, and an inquiry from the other arrives before changing the MAC address of the VM, there is no VM using the MAC address described in the inquiry.

  Therefore, the LDM that has received the inquiry returns that there is no VM using the MAC addresses 3 and 4. The LDMs that have received the reply both change the MAC address of the VM with the MAC address 1 to 3 and the MAC address of the VM with the MAC address 2 to 4 (step S502 in FIG. 26). As a result, the MAC addresses are duplicated again (step S503 in FIG. 26).

  Further, the address deduplication process is executed for each address. For example, when address duplication occurs between address 1 and address 2, the process of eliminating duplication of address 1 and the process of eliminating duplication of address 2 operate independently. For this reason, when the address 2 deduplication process tries to use the address used by the address 1 deduplication process, the address 2 deduplication process must try to assign another address. For this reason, it takes time to eliminate all duplications.

  The address change system of the present invention is an address change system having a plurality of allocation devices connected to at least one terminal and an address management device, wherein the allocation device has information about the terminal in the address management device. A terminal information notification unit that notifies the address management unit, and an address change unit that changes the address of the terminal based on a new address notified from the address management device, wherein the address management device includes a plurality of allocation devices. Based on information on a terminal connected to each allocation device notified from each of the plurality of allocation devices, and a terminal information notification request unit that requests to notify information about a terminal connected to each allocation device. An address determination unit for determining new addresses that do not overlap each other, and the address determination unit. An address notification unit for notifying the new address determined by the Department to each of the plurality of assignment device, characterized by having a.

  The address change method of the present invention is an address change method executed by an address change system having a plurality of allocation devices connected to at least one terminal and an address management device, wherein the address management device is A terminal information notification requesting step for requesting each of the plurality of allocation devices to notify information related to a terminal connected to each allocation device; and the allocation device notifies the address management device of information regarding the terminal A terminal information notification step, and an address determination step in which the address management device determines a new address that does not overlap with each other based on information related to a terminal connected to each allocation device notified from each of the plurality of allocation devices. The address management device is determined by the address determination step. An address notification step of notifying each of the plurality of allocation devices of a new address, and an address changing step of the allocation device changing the address of the terminal based on the new address notified from the address management device. It is characterized by that.

  According to the present invention, it is possible to efficiently eliminate address duplication without reducing again the duplication once eliminated in the process of executing the procedure and reducing the time required for processing.

FIG. 1 is a diagram illustrating an outline of address change in the embodiment. FIG. 2 is a block diagram showing the configuration of the address change system according to the first embodiment. FIG. 3 is a block diagram showing the configuration of the address management device of the address change system according to the first embodiment. FIG. 4 is a block diagram illustrating a configuration of an allocation unit of the address change system according to the first embodiment. FIG. 5 is a diagram for explaining an address changing method of the address changing system according to the first embodiment. FIG. 6 is a diagram for explaining an address changing method of the address changing system according to the first embodiment. FIG. 7 is a diagram for explaining an address changing method of the address changing system according to the first embodiment. FIG. 8 is a diagram for explaining an address changing method of the address changing system according to the first embodiment. FIG. 9 is a diagram for explaining an address changing method of the address changing system according to the first embodiment. FIG. 10 is a flowchart showing processing of the address management apparatus of the address change system according to the first embodiment. FIG. 11 is a block diagram showing the configuration of the address management device of the address change system according to the second embodiment. FIG. 12 is a block diagram illustrating a configuration of an allocation unit of the address change system according to the second embodiment. FIG. 13 is a diagram for explaining an address changing method of the address changing system according to the second embodiment. FIG. 14 is a diagram for explaining an address changing method of the address changing system according to the second embodiment. FIG. 15 is a diagram for explaining an address changing method of the address changing system according to the second embodiment. FIG. 16 is a diagram for explaining an address changing method of the address changing system according to the second embodiment. FIG. 17 is a diagram for explaining an address changing method of the address changing system according to the second embodiment. FIG. 18 is a flowchart showing the processing of the address management apparatus of the address change system according to the second embodiment. FIG. 19 is a diagram illustrating an example of a computer that realizes an apparatus that functions as an address management apparatus or an assignment unit by executing a program. FIG. 20 is a diagram for explaining integration of subnets. FIG. 21 is a diagram illustrating a configuration of a physical server having a VM. FIG. 22 is a diagram for explaining the movement of the VM. FIG. 23 is a diagram for explaining duplication of MAC addresses. FIG. 24 is a diagram for explaining a conventional address duplication avoiding method. FIG. 25 is a diagram for explaining a conventional address duplication avoiding method. FIG. 26 is a diagram for explaining a conventional address duplication avoidance method.

  Hereinafter, embodiments of an address change system and an address change method according to the present application will be described in detail with reference to the drawings. Note that the address change system and the address change method according to the present application are not limited by this embodiment.

  First, the outline of each embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an outline of address change in the embodiment. Since the address change system of each embodiment integrates subnets, it eliminates duplication of addresses between subnets in which the allocation functions are arranged. As one embodiment of the present invention, as shown in FIG. 1A, a method of changing the MAC addresses of all terminals can be considered. Further, as a different embodiment, as shown in FIG. 1B, it is conceivable to change the address only for terminals with overlapping MAC addresses.

[First Embodiment]
As a first embodiment, an example of an address change system that eliminates duplication of addresses by changing the MAC addresses of all terminals as shown in FIG.

[Configuration of First Embodiment]
First, the address change system according to the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the address change system according to the first embodiment. As shown in FIG. 2, the address change system 1 includes an address management device 10 connected to the L2 network 50. Furthermore, a plurality of servers 60 are connected to the L2 network 50. The server 60 includes an L2 switch 61 and an assignment unit 20 and VMs 201 and 202 connected to the L2 switch 61.

  Note that a terminal whose address is to be changed is not limited to a VM, and may be a terminal having an address. In the example of FIG. 2, the assignment unit 20 is a part of the server 60. However, the configuration of the address changing system 1 is not limited to this, and the server may be replaced with a network, and an allocation device having the same function as the allocation unit 20 may be arranged on the network.

  The configuration of the address management device 10 will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the address management device of the address change system according to the first embodiment. As shown in FIG. 3, the address management device 10 includes a control unit 11 and a storage unit 12. The control unit 11 includes a terminal number notification request unit 111, a table update unit 112, an address determination unit 113, and an address notification unit 114. The storage unit 12 has a terminal number management table 121.

  The number-of-terminals notification request unit 111 functioning as a terminal information notification request unit requests each of a plurality of allocation units to notify information related to terminals connected to the allocation units. Specifically, the terminal number notification requesting unit 111 requests to notify the number of terminals connected to each allocating unit as information on terminals.

  The address determination unit 113 determines a new address based on information regarding the terminal connected to each allocation unit notified from each of the plurality of allocation units. In the first embodiment, the address determination unit 113 determines a new address that is equal to or more than the number of terminals connected to each allocation unit and does not overlap with the address of any terminal connected to the plurality of allocation units. Further, the address notification unit 114 notifies each of the plurality of allocation units of the new address determined by the address determination unit 113 so as not to overlap.

  The configuration of the assignment unit 20 will be described with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of an allocation unit of the address change system according to the first embodiment. As shown in FIG. 4A, the assignment unit 20 includes a control unit 21 and a storage unit 22. The control unit 21 includes a terminal number notification unit 211, a table update unit 212, and an address change unit 213. In addition, the storage unit 22 has a terminal address management table 221.

  The terminal number notifying unit 211 functioning as a terminal information notifying unit notifies information related to the terminal. Specifically, the terminal number notifying unit 211 notifies the number of terminals connected to each allocating unit as information on the terminals. The address changing unit 213 changes the address of the terminal based on the notified new address.

  FIG. 4B is a diagram illustrating a configuration of an allocation unit 30 provided in a server different from the allocation unit 20. The configuration of the allocation unit 30 and the function of each unit are the same as those of the allocation unit 20.

  The address change method in the address change system will be described with reference to FIGS. 5 to 9 and details of the functions of each unit such as the address management device 10 and the assignment unit 20. 5 to 9 are diagrams for explaining an address changing method of the address changing system according to the first embodiment.

  First, as shown in FIG. 5, the address management device 10 is connected to an assignment unit 20 and an assignment unit 30. As described above, the allocation unit 30 has the same configuration as the allocation unit 20. Further, it is assumed that the assignment unit 20 and the assignment unit 30 belong to different servers or networks.

  In addition, VM 201 and VM 202 belonging to the same server or network as allocation unit 20 are connected to allocation unit 20. In addition, VM 301 and VM 302 belonging to the same server or network as allocation unit 30 are connected to allocation unit 30. In the following description, it is assumed that a VM is connected to each allocating unit represents that each allocating unit is in charge of the VM.

  As shown in FIG. 5, the MAC address of the assigning unit 20 is A, the MAC address of the assigning unit 30 is B, the MAC address of the VM 201 is C, the MAC address of the VM 202 is D, the MAC address of the VM 301 is C, and the VM 302 is The MAC address is D. As a result, MAC address duplication occurs between the VM 201 and the VM 301 and between the VM 202 and the VM 302.

  The terminal address management table 221 of the allocating unit 20 stores an ID for identifying the VM in charge and the MAC address of each VM. Similarly, the terminal address management table 321 of the assignment unit 30 also stores an ID for identifying the VM in charge and the MAC address of each VM. As illustrated in FIG. 5, the VMID of the VM 201 is 1 and the VMID of the VM 202 is 2. Further, the VMID of the VM 301 is 1, and the VMID of the VM 302 is 2. Thus, the VMID only needs to be unique in each allocation unit.

  As illustrated in FIG. 6, the terminal number notification request unit 111 of the address management device 10 requests each allocation unit to notify the MAC address of the allocation unit itself and the number of VMs in charge. Note that the terminal number management table 121 of the address management device 10 stores the MAC address of each allocation unit and the number of VMs that each allocation unit is in charge of.

  Then, as illustrated in FIG. 7, the terminal number notifying unit 211 of the allocating unit 20 transmits a message including A, which is its own MAC address, and 2, which is the number of VMs in charge, to the address management device 10. . Similarly, the number-of-terminals notification unit 311 of the allocation unit 30 transmits a message including B, which is its own MAC address, and 2, which is the number of VMs in charge, to the address management device 10.

  When the address management apparatus 10 receives a message notifying the number of assigned VMs from each allocation unit, the table updating unit 112 updates the terminal number management table 121. At this time, as shown in FIG. 7, the table updating unit 112 registers the MAC address A and the assigned VM number 2 of the allocating unit 20 and the MAC address B and the assigned VM number 2 of the allocating unit 30 in the terminal number management table 121. To do.

  Next, as illustrated in FIG. 8, the address determination unit 113 of the address management device 10 determines a set of non-overlapping MAC addresses equal to or greater than the total number of assigned VMs as a set of MAC addresses to be assigned to the VM. At this time, the determined MAC address does not overlap with the MAC address of each allocation unit. In the example of FIG. 8, a set of MAC addresses {H, I, J, K, L, M} is determined.

  Then, the address notification unit 114 of the address management device 10 allocates, to the allocation units, MAC addresses that are equal to or more than the number of VMs in charge among the determined set of MAC addresses. At this time, the set of MAC addresses allocated to each allocation unit does not overlap between the allocation units. In the example of FIG. 8, the assigning unit 20 is assigned a set of MAC addresses {H, I, L}. The assigning unit 30 is assigned a set of MAC addresses {J, K, M}.

  As shown in FIG. 9, when a set of MAC addresses is allocated from the address management device 10, the table update unit 212 of the allocation unit 20 updates the terminal address management table 221. The table updating unit 212 updates the terminal address management table 221 by changing the MAC address of each VM stored in the terminal address management table 221 to one of the MAC addresses included in the set of assigned MAC addresses. To do. At this time, the table updating unit 212 changes so that the MAC addresses after the changes of the VMs do not overlap.

  Specifically, as illustrated in FIG. 9, the table update unit 212 changes the MAC address of the VM 201 whose VMID is 1 stored in the terminal address management table 221 from C to H. In addition, the table update unit 212 changes the MAC address of the VM 202 whose VMID is 2 stored in the terminal address management table 221 from D to I.

  Then, the address changing unit 213 changes the address of each VM in charge according to the terminal address management table 221. Specifically, the MAC address of the VM 201 is changed from C to H, and the MAC address of the VM 202 is changed from D to I.

  Similarly, the table update unit 312 changes the MAC address of the VM 301 whose VMID is 1 stored in the terminal address management table 321 from C to J. The table updating unit 312 changes the MAC address of the VM 302 whose VMID is 2 stored in the terminal address management table 321 from D to K.

  The address changing unit 313 changes the address of each VM in charge according to the terminal address management table 321. Specifically, the MAC address of the VM 301 is changed from C to J, and the MAC address of the VM 302 is changed from D to K.

[Process of First Embodiment]
The processing of the address management device 10 will be described with reference to FIG. FIG. 10 is a flowchart showing processing of the address management apparatus of the address change system according to the first embodiment. As shown in FIG. 10, the terminal number notification request unit 111 requests the MAC address of each allocation unit and the number of VMs in charge (step S101).

  Next, when the information requested by the terminal number notification request unit 111 is sent, the table updating unit 112 stores the terminal number management table 121 based on the received MAC address of each allocation unit and the number of VMs in charge. Update (step S102). If there is no assignment unit with the number of assigned VMs of 2 or more in the updated terminal number management table (No in step S103), the process is terminated.

  On the other hand, when the assigned number of assigned VMs is 2 or more in the updated terminal number management table 121 (step S103, Yes), the address determination unit 113 determines a set of MAC addresses that do not overlap (step S104). Here, the MAC addresses included in the set of MAC addresses determined by the address determination unit 113 do not overlap with each other, and do not overlap with the MAC addresses of the allocation units.

  Then, the address notification unit 114 determines an allocation unit that notifies the set of MAC addresses, and notifies the determined allocation unit of the set of MAC addresses (step S105).

[Effect of the first embodiment]
The terminal number notification request unit 111 requests each of a plurality of allocation units to notify the number of terminals connected to each allocation unit. The address determination unit 113 determines a new address that is equal to or more than the number of terminals connected to each allocation unit and does not overlap with the address of any terminal connected to the plurality of allocation units. The address notification unit 114 notifies each of the plurality of allocation units of the new address determined by the address determination unit 113 so as not to overlap.

  The terminal number notification unit 211 notifies the number of terminals connected to each allocation unit. The address changing unit 213 changes the address of the terminal based on the notified new address. As a result, it is possible to efficiently eliminate the duplication of addresses without causing again the duplication once eliminated in the process of executing the procedure, reducing the time required for processing.

[Second Embodiment]
As an example of the second embodiment, an example of an address change system that eliminates duplication of addresses by changing addresses only for terminals having duplicate MAC addresses will be described as shown in FIG.

[Configuration of Second Embodiment]
The overall configuration of the address change system according to the second embodiment is the same as the configuration of the address change system according to the first embodiment shown in FIG. In the second embodiment, the configuration of the address management device 10 and each allocation unit is different from the first embodiment.

  The configuration of the address management device 10 will be described with reference to FIG. FIG. 11 is a block diagram showing the configuration of the address management device of the address change system according to the second embodiment. As shown in FIG. 11, the address management device 10 includes a control unit 11 and a storage unit 12. The control unit 11 includes a terminal address notification request unit 111a, a table update unit 112, an address search unit 113a, an address determination unit 113, and an address notification unit 114. The storage unit 12 also has a terminal address management table 122.

  The terminal address notification request unit 111a functioning as a terminal information notification request unit requests each of a plurality of allocation units to notify information related to the terminals connected to the allocation units. Specifically, the terminal number notification request unit 111a requests to notify the address of the terminal connected to each allocation unit as information on the terminal.

  The address determination unit 113 determines a new address based on information regarding the terminal connected to each allocation unit notified from each of the plurality of allocation units. In the second embodiment, the address determination unit 113 determines a new address that does not overlap with the address of any terminal when there is an overlapping address in the address of the terminal connected to each allocation unit. Further, the address notification unit 114 notifies each of the plurality of allocation units of the new address determined by the address determination unit 113 so as not to overlap.

  The configuration of the assignment unit 20 will be described with reference to FIG. FIG. 12 is a block diagram illustrating a configuration of an allocation unit of the address change system according to the first embodiment. As shown in FIG. 12A, the assignment unit 20 includes a control unit 21 and a storage unit 22. The control unit 21 includes a terminal address notification unit 211a, a table update unit 212, and an address change unit 213. In addition, the storage unit 22 has a terminal address management table 221.

  The terminal address notification unit 211a that functions as a terminal information notification unit notifies information about the terminal. Specifically, the terminal address notification unit 211a notifies the address of the terminal connected to each allocation unit as information about the terminal. The address changing unit 213 changes the address of the terminal based on the notified new address.

  FIG. 12B is a diagram illustrating a configuration of the allocation unit 30 provided in a server different from the allocation unit 20. FIG. 12C is a diagram illustrating a configuration of an allocating unit 40 provided in a server different from the allocating unit 20 and the allocating unit 30. The configuration of the allocation unit 30 and the allocation unit 40 and the function of each unit are the same as those of the allocation unit 20.

  The address change method in the address change system will be described with reference to FIGS. 13 to 17 together with details of the functions of each unit such as the address management device 10 and the assignment device 20. 13 to 17 are diagrams for explaining an address changing method of the address changing system according to the second embodiment.

  First, as shown in FIG. 13, the address management device 10 is connected to an assignment unit 20, an assignment unit 30, and an assignment unit 40. Note that the allocation unit 30 and the allocation unit 40 have the same configuration as the allocation unit 20 as described above. In addition, it is assumed that the assignment unit 20, the assignment unit 30, and the assignment unit 40 belong to different servers or networks.

  The assignment unit 20 is in charge of the VM 201 and the VM 202. The allocation unit 30 is in charge of the VM 301 and the VM 302. The allocation unit 40 is in charge of the VM 401 and VM 402.

  As shown in FIG. 13, the MAC address of the assigning unit 20 is A, the MAC address of the assigning unit 30 is B, the MAC address of the assigning unit 40 is F, the MAC address of the VM 201 is C, the MAC address of the VM 202 is D, The MAC address of the VM 301 is C, the MAC address of the VM 302 is E, the MAC address of the VM 401 is I, and the MAC address of the VM 402 is J. As a result, duplication of MAC addresses occurs between the VM 201 and the VM 301.

  The terminal address management table 221 of the allocating unit 20 stores an ID for identifying the VM in charge and the MAC address of each VM. Similarly, the terminal address management table 321 of the allocation unit 30 and the terminal address management table 421 of the allocation unit 40 also store an ID for identifying the VM in charge and the MAC address of each VM. As illustrated in FIG. 13, the VM 201 has a VMID of 1 and the VM 202 has a VMID of 2. Further, the VMID of the VM 301 is 1, and the VMID of the VM 302 is 2. The VMID of the VM 401 is 1 and the VMID of the VM 402 is 2.

  As illustrated in FIG. 13, the terminal address notification request unit 111 a of the address management device 10 requests each allocation unit to notify the MAC address of the allocation unit itself and the MAC address of the VM in charge. Note that the terminal address management table 122 of the address management device 10 stores the MAC address of each allocation unit and the MAC address of the VM that the allocation unit is in charge of.

  Then, as illustrated in FIG. 14, the terminal address notification unit 211 a of the allocation unit 20 transmits a message including its own MAC address A and the MAC addresses C and D of the VMs in charge to the address management device 10. To do. The terminal address notifying unit 311a of the allocating unit 30 transmits a message including its own MAC address B and the MAC addresses C and E of the VMs in charge to the address management device 10. In addition, the terminal address notifying unit 411a of the allocating unit 40 transmits a message including F, which is its own MAC address, and the MAC addresses I and J of the VM in charge to the address management device 10.

  Further, when the address management device 10 receives a message notifying the MAC address of the assigned VM from each allocation unit, the table update unit 112 updates the terminal address management table 122. At this time, as shown in FIG. 15, the table updating unit 112 stores the MAC address A of the allocating unit 20 and the MAC addresses C and D of the responsible VM in the terminal address management table 122 and the MAC address B and the responsible VM of the allocating unit 30. MAC addresses C and E, MAC address F of the assigning unit 40, and MAC addresses I and J of the VM in charge are registered.

  Here, the address search unit 113a searches for a duplicate VM MAC address from the terminal address management table 122. Then, since there is a VM with the MAC address C in both the assigning unit 20 with the MAC address A and the assigning unit 30 with the MAC address B, the MAC address is duplicated. I understand that.

  Then, as illustrated in FIG. 16, the address determination unit 113 determines a new MAC address that is not duplicated with the MAC address of any VM to be assigned to the VM with the duplicated MAC address.

  In the example of FIG. 16, the address determination unit 113 changes the new MAC address of the VM whose MAC address is C, which is assigned to the assignment unit 20 whose MAC address is A, to F, and the assignment whose MAC address is B The new MAC address of the VM whose MAC address is in charge of the unit 30 is changed to G. Note that one of the overlapping MAC addresses may be used as it is without being changed.

  Then, the address notification unit 114 notifies each allocation unit of the new address determined by the address determination unit 113. For example, the address notification unit 114 notifies the allocation unit 20 to set the MAC address of the VM using the MAC address C to F. Further, the address notification unit 114 notifies the allocation unit 30 to set the MAC address of the VM using the MAC address C to G. Further, since there is no duplication of the MAC address in the VM that the assignment unit 40 is in charge of, the address notification unit 114 does not notify the assignment unit 40 of anything.

  Then, as illustrated in FIG. 17, each allocation unit changes the MAC address of the VM in charge in accordance with the notification from the address notification unit 114. For example, the address changing unit 213 of the assigning unit 20 changes the MAC address of the VM 201 from C to F. The address changing unit 313 of the assigning unit 30 changes the MAC address of the VM 301 from C to G. Further, the address changing unit 413 of the assigning unit 40 does nothing because there is no VM to be changed.

[Process of Second Embodiment]
The processing of the address management device 10 will be described using FIG. FIG. 18 is a flowchart showing the processing of the address management apparatus of the address change system according to the second embodiment. As illustrated in FIG. 18, the terminal address notification request unit 111a requests the MAC address of each allocation unit and the MAC address of the VM in charge (step S201).

  Next, when the information requested by the terminal address notification request unit 111a is sent, the table update unit 112 determines the terminal address management table based on the received MAC address of each allocation unit and the MAC address of the VM in charge. 122 is updated (step S202). Here, the address search unit 113a searches for a VM with a duplicate MAC address from the updated terminal address management table 122 (step S203). If there is no VM with a duplicate MAC address in the updated terminal address management table 122 (No in step S204), the process ends.

  On the other hand, if there is a VM with a duplicate MAC address in the updated terminal address management table 122 (Yes in step S204), the address determination unit 113 determines a new address of the VM with a duplicate MAC address ( Step S205). Here, the new MAC address does not overlap with any address registered in the terminal address management table 122 and does not overlap with the MAC address of each allocation unit.

  Then, the address notification unit 114 notifies the allocation unit in charge of the VM that has determined the new MAC address of the new address corresponding to the duplicate address (step S206).

[Effects of Second Embodiment]
The terminal address notification request unit 111a requests each of the plurality of allocation units to notify the address of the terminal connected to each allocation unit. The address determination unit 113 determines a new address that does not overlap with the address of any terminal when there is an overlapping address among the addresses of the terminals connected to the allocation units of the plurality of allocation units. The address notification unit 114 notifies each of the plurality of allocation units of the new address determined by the address determination unit 113 so as not to overlap.

  The terminal address notification unit 211a notifies the address of the terminal connected to each allocation unit. The address changing unit 213 changes the address of the terminal based on the notified new address. As a result, it is possible to efficiently eliminate the duplication of addresses without causing again the duplication once eliminated in the process of executing the procedure, reducing the time required for processing. Furthermore, compared to the first embodiment, the number of terminals that change addresses can be reduced.

[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 is realized by a CPU (Central Processing Unit) and a program analyzed and executed by the CPU, or hardware by wired logic. Can be realized as

  In addition, among the processes described in the present embodiment, all or part of the processes described as being automatically performed can be manually performed, or the processes described as being manually performed can be performed. All or a part 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. 19 is a diagram illustrating an example of a computer that realizes an apparatus that functions as an address management apparatus or an assignment unit by executing a program. The computer 1000 includes a memory 1010 and a CPU 1020, for example. 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 1110 and a keyboard 1120, for example. The video adapter 1060 is connected to the display 1130, 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, the program that defines each process of the device functioning as the address management device 10 or the assignment unit 20 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, the hard disk drive 1090 stores a program module 1093 for executing processing similar to the functional configuration of the address management device 10 or the device functioning as the assignment unit 20. 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.). The program module 1093 and the program data 1094 may be read by the CPU 1020 from another computer via the network interface 1070.

DESCRIPTION OF SYMBOLS 1 Address change system 10 Address management apparatus 11, 21, 31, 41 Control part 12, 22, 32, 42 Storage part 20, 30, 40 Allocation part 50 L2 network 60 Server 61 L2 switch 111 Terminal number notification request part 111a Terminal address Notification request unit 112 Table update unit 113 Address determination unit 113a Address search unit 114 Address notification unit 121 Terminal number management table 122, 221 321 421 Terminal address management table 201 202 202 301 302 401 VM
211, 311, 411 Terminal number notification unit 211 a, 311 a, 411 a Terminal address notification unit 212, 312, 412 Table update unit 213, 313, 413 Address change unit

Claims (4)

An address change system comprising a plurality of allocation devices connected to at least one terminal, and an address management device that manages addresses of the terminals,
The assigning device is:
A terminal information notification unit for notifying the address management device of information related to the terminal;
An address changing unit for changing the address of the terminal based on the new address notified from the address management device;
Have
The address management device includes:
A terminal information notification request unit that requests each of the plurality of allocation devices to notify information related to a terminal connected to each allocation device;
An address determination unit that determines new addresses that do not overlap with each other based on information about the terminals connected to each allocation device notified from each of the plurality of allocation devices;
An address notification unit for notifying each of the plurality of allocation devices of the new address determined by the address determination unit;
An address change system comprising: The terminal information notification request unit requests to notify the number of terminals connected to each allocation device as information on the terminals,
The terminal information notification unit notifies the number of terminals connected to each allocation device as information on the terminals,
The address determination unit determines a new address that is equal to or more than the number of terminals connected to each allocating device and does not overlap with the address of any terminal connected to the plurality of allocating devices. The address change system described. The terminal information notification request unit requests to notify the address of a terminal connected to each allocation device as information on the terminal,
The terminal information notification unit notifies the address of the terminal connected to each allocation device as information on the terminal,
The address determination unit determines a new address that does not overlap with any of the addresses of the terminals when there is an overlapping address among the addresses of the terminals connected to the allocation apparatuses of the plurality of allocation apparatuses. The address change system according to claim 1. An address change method executed in an address change system having a plurality of allocation devices connected to at least one terminal, and an address management device that manages addresses of the terminals,
A terminal information notification requesting step for requesting the address management device to notify each of the plurality of allocation devices of information related to a terminal connected to each allocation device;
A terminal information notification step in which the allocation device notifies the address management device of information related to the terminal;
An address determining step in which the address management device determines a new address that does not overlap with each other based on information about a terminal connected to each allocation device notified from each of the plurality of allocation devices;
An address notification step in which the address management device notifies each of the plurality of allocation devices of the new address determined by the address determination step;
The assigning device changes an address of the terminal based on a new address notified from the address management device; and
A method for changing an address, comprising:

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