JP2013005038A - Mac (media access control) address translation apparatus, mac address translation method, mac address translation program, and intersite connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide appropriate solutions to the problem of duplicate MAC (Media Access Control) addresses.SOLUTION: A MAC address translation apparatus of the embodiment includes a MAC address translation section in a system where a frame transmitted from a terminal belonging to a transmission source site is forwarded toward a terminal belonging to a destination site. The MAC address translation section receives a frame forwarded from the transmission source site, and translates MAC addresses in the frame, from those which identify the terminal belonging to the transmission source site and the terminal belonging to the destination site uniquely within the transmission source site to those which identify the terminal belonging to the transmission source site and the terminal belonging to the destination site uniquely within the destination site.

Description

  Embodiments described herein relate generally to a MAC address conversion device, a MAC address conversion method, a MAC address conversion program, and an inter-base connection system.

  In recent years, technologies for connecting a plurality of bases to each other (for example, next-generation corporate network cooperation technology) have been proposed. According to this technology, for example, VPNs (Virtual Private Networks) of each company are connected to each other, and a collaborative space is formed between different companies. In recent years, a technology called cloud computing has appeared. According to cloud computing, hardware, software, data, and the like are stored in a separate base, and a user receives a service by accessing the separate base. In addition, a server-side base that stores hardware, software, data, and the like in cloud computing is hereinafter referred to as a “cloud base”.

  In cloud bases, virtual machine technology is often used. Virtual machine technology divides physical hardware logically and operates an OS (Operating System) for each divided hardware, so that one machine is as if it were multiple machines. It is a technology to make it work. For example, by applying this technology to a single server installed at a cloud base, it is possible to operate as if it were a plurality of servers and provide services to a plurality of companies individually.

  Here, when virtual machine technology is used, the MAC address of the virtual machine may overlap. In such a case, according to the conventional technology, for example, it is necessary to investigate duplicate MAC addresses and non-duplicated and unused MAC addresses, and reset the investigated unused MAC addresses to the corresponding virtual machines. There is.

VMware, “VMware vCenter Server4.1 Update1 Release Notes”, “Virtual Machine MAC Address Conflicts”, [online], [Search May 31, 2011], Internet <URL: http: //www.vmware .com / jp / support / vsphere4 / doc / vsp_vc41_u1_rel_notes.html> Takahide Imada, “Flexible configuration of complex networks”, [online], [May 31, 2011 search], Internet <URL: http://itpro.nikkeibp.co.jp/article/COLUMN/20061019/ 251211 />

  However, with the above-described conventional technology, it is not possible to appropriately resolve duplication of MAC addresses.

  The MAC address conversion apparatus according to the embodiment includes a MAC address conversion unit in a system that transfers a frame transmitted from a terminal subordinate to a transmission source base toward a terminal subordinate to the destination base. When the MAC address conversion unit receives a frame transferred from the transmission source site, the MAC address included in the frame, and a terminal subordinate to the transmission source site and a terminal subordinate to the destination site within the transmission source site Is uniquely converted to a MAC address that uniquely identifies a terminal subordinate to the transmission source base and a terminal subordinate to the destination base within the destination base.

  In addition, the MAC address conversion method according to the embodiment is executed by a MAC address conversion device in a system that transfers a frame transmitted from a terminal subordinate to a transmission source base toward a terminal subordinate to the destination base, and performs a MAC address conversion step. Including. When the MAC address conversion step receives a frame transferred from the transmission source site, the MAC address included in the frame and a terminal subordinate to the transmission source site and a terminal subordinate to the destination site within the transmission source site Is uniquely converted to a MAC address that uniquely identifies a terminal subordinate to the transmission source base and a terminal subordinate to the destination base within the destination base.

  The MAC address conversion program according to the embodiment causes a computer to function as a MAC address conversion device.

  The inter-base connection system according to the embodiment connects a plurality of bases to each other, transfers a frame transmitted from a terminal subordinate to the transmission source base toward a terminal subordinate to the destination base, and a transmission source transfer unit And a MAC address conversion device and a destination transfer unit. When the transmission source transfer unit receives a frame transmitted from a terminal subordinate to the transmission source base, the MAC address included in the frame and the terminal subordinate to the destination base are uniquely identified within the transmission base. The frame is transferred by route control based on the MAC address. When the MAC address conversion device receives the frame transferred by the source transfer unit, the MAC address included in the frame is a MAC address included in the frame and the terminal subordinate to the source base and the destination base subordinate within the source base The MAC address that uniquely identifies the terminal is converted into a MAC address that uniquely identifies the terminal under the transmission source base and the terminal under the destination base within the destination base. When the destination transfer unit receives the frame whose MAC address has been converted by the MAC address conversion unit, the MAC address included in the frame, and the terminal under the destination site is uniquely identified within the destination site The frame is transferred by route control based on the MAC address.

  According to the MAC address conversion device, the MAC address conversion method, the MAC address conversion program, and the inter-base connection system according to the embodiment, there is an effect that duplication of MAC addresses can be appropriately solved.

FIG. 1 is a diagram illustrating a configuration example of the inter-base connection system according to the first embodiment. FIG. 2 is a diagram illustrating a configuration example of an inter-base connection system according to a modification example of the first embodiment. FIG. 3 is a diagram for explaining duplication of MAC addresses of virtual machines. FIG. 4 is a diagram for explaining a specific example (SingleMAT bidirectional method) of MAC address conversion according to the second embodiment. FIG. 5 is a diagram for explaining a specific example (SingleMAT bidirectional method) of MAC address conversion according to the second embodiment. FIG. 6 is a diagram for explaining a configuration example of the MAC address translation device according to the second embodiment. FIG. 7 is a diagram for explaining an input / output I / F information table according to the second embodiment. FIG. 8 is a diagram for explaining a MAC address conversion table according to the second embodiment. FIG. 9 is a flowchart illustrating a procedure of MAC address conversion processing according to the second embodiment. FIG. 10 is a diagram for explaining a specific example (SingleMAT one-way method) of MAC address conversion according to the second embodiment. FIG. 11 is a diagram for explaining a specific example (TwiceMAT bidirectional method) of MAC address conversion according to the second embodiment. FIG. 12 is a diagram for explaining a specific example (TwiceMAT bidirectional method) of MAC address conversion according to the second embodiment. FIG. 13 is a diagram for explaining a configuration example of the MAC address translation device according to the second embodiment. FIG. 14 is a diagram for explaining an input / output I / F base information table according to the second embodiment. FIG. 15 is a diagram for explaining the MAC address conversion table 42 according to the second embodiment. FIG. 16 is a flowchart illustrating a procedure of MAC address conversion processing according to the second embodiment. FIG. 17 is a diagram for explaining a specific example (TwiceMAT one-way method) of MAC address conversion according to the second embodiment. FIG. 18 is a diagram illustrating a computer that executes a program for converting a MAC address.

  Hereinafter, embodiments of a MAC address conversion device, a MAC address conversion method, a MAC address conversion program, and an inter-base connection system according to the present invention will be described. In addition, this invention is not limited by the following embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of the inter-base connection system 1 according to the first embodiment. As shown in FIG. 1, the inter-base connection system 1 according to the first embodiment accommodates the base A and the base B, and connects the base A and the base B to each other. For example, the inter-base connection system 1 transfers a frame transmitted from the terminal 30-1 subordinate to the base A toward the terminal 30-2 subordinate to the base B.

  Specifically, the inter-base connection system 1 according to the first embodiment includes a MAC address conversion device 10, a transfer unit 20-1, and a transfer unit 20-2. When the transfer unit 20-1 receives the frame transmitted from the terminal 30-1 under the base A, the transfer unit 20-1 transfers the received frame by route control (hereinafter, switching) based on the MAC address included in the frame. This path control can be realized using a known method.

  For example, the frame transmitted from the terminal 30-1 subordinate to the base A includes “MAC address that uniquely identifies the terminal 30-2 subordinate to the base B within the base A” as the destination MAC address. On the other hand, the transfer unit 20-1 has, as switching information, information on an interface that should output a frame including this MAC address as a destination MAC address. For this reason, the transfer unit 20-1 transfers a frame transmitted from the terminal 30-1 under the base A according to the switching information.

  The frame transferred by the transfer unit 20-1 is received by the MAC address conversion device 10. When receiving the frame transferred by the transfer unit 20-1, the MAC address conversion device 10 converts the MAC address included in this frame.

  For example, the frame transferred by the transfer unit 20-1 includes “MAC address that uniquely identifies the terminal 30-1 subordinate to the site A within the site A” as the source MAC address, and the destination MAC address As “a MAC address by which the terminal 30-2 under the base B is uniquely identified in the base A”. The MAC address conversion device 10 refers to a preset MAC address conversion table, and converts this transmission source MAC address into “a MAC address uniquely identifying the terminal 30-1 under the base A within the base B”. Then, the destination MAC address is converted into “a MAC address in which the terminal 30-2 under the base B is uniquely identified in the base B”.

  The frame whose MAC address has been converted by the MAC address conversion device 10 is received by the transfer unit 20-2. When the transfer unit 20-2 receives the frame whose MAC address has been converted by the MAC address conversion unit 10, the transfer unit 20-2 transfers the received frame by switching based on the MAC address included in the frame.

  For example, the frame in which the MAC address is converted by the MAC address conversion device 10 includes “a MAC address uniquely identifying the terminal 30-2 under the base B within the base B” as the destination MAC address. On the other hand, the transfer unit 20-2 has, as switching information, information on an interface that should output a frame including this MAC address as a destination MAC address. For this reason, the transfer unit 20-2 transfers the frame whose MAC address has been converted by the MAC address conversion device 10 in accordance with the switching information.

  As described above, the inter-base connection system 1 according to the first embodiment first performs switching according to the MAC address that is independently used in the base on the transmission source side, and converts the MAC address included in the frame after switching. To do. The converted MAC address is a MAC address that is used independently within the destination site. For this reason, the inter-base connection system 1 performs switching according to the converted MAC address and transfers the frame toward the destination terminal.

  As described above, the inter-base connection system 1 uses both the source MAC address and the destination MAC address included in the frame from the MAC address independently used in the source-side base within the destination-side base. The frame is converted into a MAC address that is used independently, and the frame after the MAC address conversion is output to the destination side base.

  For this reason, according to the first embodiment, since the MAC address only needs to be uniquely assigned in each site, duplication of the MAC address can be appropriately solved. In other words, according to the first embodiment, attention is paid to the MAC addresses used (or used) at the connection destination bases even when the MAC addresses used at the bases overlap. No need to pay.

  FIG. 2 is a diagram illustrating a configuration example of the inter-base connection system 1 according to a modification of the first embodiment. As shown in FIG. 2, the inter-base connection system 1 may have a configuration in which the transfer unit 20-1 and the transfer unit 20-2 are installed at each base. Further, the inter-base connection system 1 may be configured such that one of the transfer unit 20-1 and the transfer unit 20-2 is installed at the base.

(Second Embodiment)
Next, a second embodiment will be described. In the second embodiment, as a MAC address conversion method, “SingleMAT (MAC Address Translation) bidirectional method”, “SingleMAT one-way method”, “TwiceMAT bidirectional method”, and “TwiceMAT one-way method” are used. The four methods will be described in order. Moreover, in 2nd Embodiment, although the base connection system 1 demonstrates the example which connects two bases, the cloud base A and the cloud base B, embodiment is not restricted to this. Since the inter-base connection system 1 connects two bases in a full mesh type for a plurality of bases participating in one collaborative space, the number of bases can be arbitrarily changed.

  Here, before describing the inter-base connection system 1 according to the second embodiment, problems when the inter-base connection system 1 according to the second embodiment is not applied will be described. When a plurality of cloud bases are connected to each other and virtual machine technology is used at the cloud base, the MAC address of the virtual machine used at each cloud base may overlap between the cloud bases. FIG. 3 is a diagram for explaining duplication of MAC addresses of virtual machines. In FIG. 3, a solid line arrow indicates a connection between already established cloud bases, and a dotted line arrow indicates a newly established connection between cloud bases. The MAC address of the virtual machine is uniquely assigned in each cloud base, but as shown in FIG. 3, for example, the virtual machine A-2 of the cloud base A and the virtual machine B-2 of the cloud base B When the connection between the cloud bases is newly established, for example, the MAC address of the virtual machine A-2 of the cloud base A and the MAC address of the virtual machine B-1 of the cloud base B overlap.

  When the inter-base connection system 1 according to the second embodiment is not applied, for example, a MAC address that is duplicated between a plurality of cloud bases and a non-overlapping and unused MAC address are investigated, and the unused MAC that is investigated The address must be reset to the corresponding virtual machine at each cloud site.

  In this regard, according to the inter-base connection system 1 according to the second embodiment, as will be described below, the MAC address only needs to be assigned uniquely within each cloud base. Can be solved. Hereinafter, the inter-base connection system 1 according to the second embodiment will be described.

(SingleMAT bidirectional method)
4 and 5 are diagrams for explaining a specific example (SingleMAT bidirectional method) of MAC address conversion according to the second embodiment.

  As shown in FIG. 4, each cloud base includes a cloud management unit and a hypervisor, and a virtual machine constructed by the hypervisor operates. For example, the cloud base A includes a cloud management unit A and a hypervisor A, and a virtual machine A-1 and a virtual machine A-2 constructed by the hypervisor A operate. The cloud management unit A manages the MAC address assigned to each virtual machine in the cloud base A. The hypervisor A exchanges information with the cloud management unit A, and notifies the cloud management unit A of the MAC address set for the virtual machine, for example. For example, the hypervisor A describes the MAC address in a packet received from the virtual machine and notifies the cloud management unit A of the MAC address. Although not described, the cloud base B is configured in the same manner as the cloud base A.

  Here, as shown in FIG. 4, in the SingleMAT bidirectional method, the inter-base connection system 1 includes a MAC address conversion device 10-1 and a MAC address conversion device 10-2 as MAC address conversion devices.

  In the second embodiment, the MAC address conversion device 10-1 converts the transmission source MAC address for the frame transmitted from the cloud base A side, and the destination MAC for the frame transmitted from the cloud base B side. Translate the address. That is, the MAC address conversion device 10-1 converts the MAC address of the virtual machine under the cloud base A. Further, the MAC address conversion device 10-2 converts the destination MAC address for a frame transmitted from the cloud base A side, and converts the transmission source MAC address for a frame transmitted from the cloud base B side. That is, the MAC address conversion device 10-2 converts the MAC address of the virtual machine under the cloud base B.

  In FIG. 4, for example, the notation [S-MAT AB] means that the method is SingleMAT and the MAC address of the virtual machine under the cloud base A is converted (the cloud base B is a connection destination). ).

  The MAC address conversion of a frame transferred from the cloud base A side to the cloud base B side will be described with reference to FIG. First, as illustrated in FIG. 5, for example, in the cloud base A, “MAC address 1” is used as the MAC address for uniquely identifying the virtual machine A-1 in the cloud base A, and the virtual in the cloud base A is used. “MAC address 2” is used as the MAC address for uniquely identifying the machine A-2. Further, in the cloud base A, the “MAC address 3” is used as the MAC address for uniquely identifying the virtual machine B-1 in the cloud base B that is the connection destination in the cloud base A. “MAC address 4” is used as the MAC address for uniquely identifying the virtual machine B-2. Since the virtual machine B-1 and the virtual machine B-2 are not virtual machines built in the cloud base A but virtual machines built in the cloud base B, they are surrounded by a dotted frame in FIG.

  On the other hand, for example, in the cloud base B, “MAC address 1” is used as the MAC address for uniquely identifying the virtual machine B-1 in the cloud base B, and the virtual machine B-2 is uniquely in the cloud base B. “MAC address 2” is used as the MAC address to be identified. Further, in the cloud base B, the “MAC address 3” is used as the MAC address for uniquely identifying the virtual machine A-1 in the cloud base A, which is the connection destination, in the cloud base B. “MAC address 4” is used as the MAC address for uniquely identifying the virtual machine A-2. Since the virtual machine A-1 and the virtual machine A-2 are not virtual machines built in the cloud base B but virtual machines built in the cloud base A, they are surrounded by a dotted frame in FIG.

  In this way, although the cloud base A and the cloud base B use the same MAC address, for example, “MAC address 1” is assigned to the virtual machine A-1 in the cloud base A, In the cloud base B, the MAC address is used to identify different virtual machines, such as being assigned to the virtual machine B-1. That is, duplication of the MAC address occurs.

  However, even in such a case, according to the inter-base connection system 1 according to the second embodiment, both the source MAC address and the destination MAC address included in the frame are stored in the cloud base A on the source side. Since the MAC address that is used independently is forcibly converted to the MAC address that is used independently in the cloud site B on the destination side, duplication of the MAC address does not become a problem.

  Specifically, first, when the transfer unit 20-1 on the cloud base A side receives the frame transmitted from the virtual machine A-1 under the cloud base A, it is a MAC address included in the frame, This frame is transferred by switching based on the MAC address “MAC address 3” in which the virtual machine B-1 under the cloud base B is uniquely identified in the cloud base A. The transfer unit 20-1 can identify which virtual machine is the transmission source by the MAC address included in the received frame, but the MAC address can be determined by using a NIC (Network Interface Card) identifier together. Can also be prevented. In FIG. 5, DA (Destination Address) indicates a destination MAC address, and SA (Source Address) indicates a source MAC address.

  Next, when the MAC address conversion device 10-1 receives the frame transferred by the transfer unit 20-1, the MAC address conversion device 10-1 refers to the MAC address conversion table for the cloud base A and transmits the source MAC address (SA) included in this frame. ). For example, the MAC address conversion device 10-1 refers to “within its own site” in the MAC address conversion table using the source MAC address “MAC address 1” included in the frame, and sets “MAC address 1” within its own site. The “MAC address 3” in the connection destination base registered in association is acquired. Then, the MAC address conversion device 10-1 rewrites the source MAC address “MAC address 1” included in the frame to “MAC address 3”, and sets the rewritten frame as a pair of I / Fs that have received this frame in advance. Output from the specified I / F.

  Here, the “in-house” MAC address registered in the MAC address conversion table is the MAC address by which the virtual machine under the cloud base is uniquely identified on the cloud base side where the MAC address conversion table is used. As the MAC address actually used. For example, in the case of the MAC address conversion table for the cloud base A, the MAC address actually used as the MAC address for uniquely identifying the virtual machine under the cloud base A on the cloud base A side.

  On the other hand, the MAC address “in the connected base” is not the cloud base where the MAC address conversion table is used, but the virtual machine under the cloud base where the MAC address conversion table is used is unique on the connected cloud base side. It is the MAC address actually used as the MAC address identified by. For example, in the case of the MAC address conversion table for the cloud base A, the MAC address actually used as the MAC address for uniquely identifying the virtual machine under the cloud base A on the cloud base B side. In the cloud base B, an unused MAC address that is not assigned to a virtual machine under the cloud base B is assigned.

  That is, the MAC address conversion apparatus 10-1 subordinates the MAC address “MAC address 1” in which the virtual machine A-1 under the cloud base A is uniquely identified in the cloud base A to the cloud base A under the cloud base A. To the MAC address “MAC address 3” uniquely identifying the virtual machine A-1.

  Next, when the MAC address conversion device 10-2 receives the frame transferred by the MAC address conversion device 10-1, the MAC address conversion device 10-2 refers to the MAC address conversion table for the cloud base B, and the destination MAC address ( DA). For example, the MAC address conversion device 10-2 refers to “within connection destination base” in the MAC address conversion table using the destination MAC address “MAC address 3” included in the frame, and within the connection destination base “MAC address 3”. "MAC address 1" in its own site registered in association with the. Then, the MAC address conversion device 10-2 rewrites the destination MAC address “MAC address 3” included in the frame to “MAC address 1”, and designates the rewritten frame as a pair of I / Fs that received this frame in advance. Output from the I / F.

  Here, the “in-house” MAC address registered in the MAC address conversion table is the MAC address by which the virtual machine under the cloud base is uniquely identified on the cloud base side where the MAC address conversion table is used. As the MAC address actually used. For example, in the case of the MAC address conversion table for the cloud base B, the MAC address actually used as the MAC address for uniquely identifying the virtual machine under the cloud base B on the cloud base B side.

  On the other hand, the MAC address “in the connected base” is not the cloud base where the MAC address conversion table is used, but the virtual machine under the cloud base where the MAC address conversion table is used is unique on the connected cloud base side. It is the MAC address actually used as the MAC address identified by. For example, in the case of the MAC address conversion table for the cloud base B, the MAC address actually used as the MAC address for uniquely identifying the virtual machine under the cloud base B on the cloud base A side. In the cloud base A, an unused MAC address that is not assigned to a virtual machine under the cloud base A is assigned.

  That is, the MAC address conversion device 10-2 subordinates the MAC address “MAC address 3” that uniquely identifies the virtual machine B-1 under the cloud base B in the cloud base A to the cloud base B under the cloud base B. To the MAC address “MAC address 1” that uniquely identifies the virtual machine B-1.

  After that, when receiving the frame transmitted from the MAC address conversion device 10-2, the transfer unit 20-2 on the site B side is the MAC address included in this frame, and the cloud site B is subordinate to the cloud site B. This frame is transferred by switching based on the MAC address “MAC address 1” uniquely identifying the virtual machine B-1.

  If the frame is a frame including an ARP (Address Resolution Protocol) packet, the MAC address conversion device 10-1 and the MAC address conversion device 10-2 also convert the MAC address included in the frame. Here, the MAC address included in the frame includes a MAC address included in the header portion (Ethernet (registered trademark) transmission layer) and a MAC address included in the packet portion (Ethernet packet data) (RFC (Request For). Comments) 826). In the second embodiment, when the frame is a frame including an ARP packet, the MAC address included in the packet part is converted as well as the MAC address included in the header part. In the case of a normal frame (a frame not including an ARP packet) described above, only the conversion of the MAC address included in the header portion is performed.

  For example, when a frame including an ARP request packet is transferred from the cloud base A side to the cloud base B side, the destination MAC address included in this frame (header part and packet part) is a broadcast address, and the source MAC The address is, for example, a MAC address that uniquely identifies a virtual machine under the cloud base A within the cloud base A. In this case, the MAC address conversion device 10-1 converts the transmission source MAC address into a MAC address that uniquely identifies the virtual machine under the cloud base A within the cloud base B, as described above. On the other hand, the MAC address conversion device 10-2 does not convert the destination MAC address.

  On the other hand, for example, when a frame including an ARP response packet is transferred from the cloud base A side to the cloud base B side, the MAC address conversion device 10-1 sets the source MAC address to the cloud base B as described above. The virtual machine under the cloud base A is converted into a MAC address that is uniquely identified. Further, the MAC address conversion device 10-2 converts the destination MAC address into a MAC address that uniquely identifies a virtual machine under the cloud base B within the cloud base B, as described above.

  Here, the MAC address conversion apparatus 10 in the SingleMAT bidirectional method will be described. FIG. 6 is a diagram for explaining a configuration example of the MAC address translation device 10 according to the second embodiment. Note that both the MAC address conversion device 10-1 and the MAC address conversion device 10-2 described with reference to FIG. 4 can be realized by the same configuration, and the configuration of the MAC address conversion device 10 described below. Can be realized.

  As shown in FIG. 6, the MAC address conversion apparatus 10 according to the second embodiment includes an input / output I / F information table 11, a MAC address conversion table 12, a frame reception unit 13, and an input I / F determination unit. 14, a source MAC address conversion unit 15, a destination MAC address conversion unit 16, a CRC (Cyclic Redundancy Check) recalculation unit 17, and a frame transmission unit 18.

  The input / output I / F information table 11 and the MAC address conversion table 12 are realized by, for example, a semiconductor memory device such as a RAM (Random Access Memory) or a flash memory, a hard disk, an optical disk, or the like. The frame receiving unit 13, the input I / F determining unit 14, the source MAC address converting unit 15, the destination MAC address converting unit 16, the CRC recalculating unit 17, and the frame transmitting unit 18 are, for example, ASIC (Application Specific It is realized by an integrated circuit such as an integrated circuit (FPGA) or a field programmable gate array (FPGA), or an electronic circuit such as a central processing unit (CPU) or a micro processing unit (MPU).

  The input / output I / F information table 11 stores input / output I / F information. The input / output I / F information is used for processing by the input I / F determination unit 14 and the frame transmission unit 18. For example, the input I / F determination unit 14 determines whether the frame received by the MAC address conversion device 10 is input / output I / F information from the transfer unit 20 or another MAC address. This is used to determine whether the frame is transmitted from the conversion device 10. Further, for example, the frame transmission unit 18 uses the input / output I / F information to determine from which I / F the frame in which the MAC address is converted should be output.

  FIG. 7 is a diagram for explaining the input / output I / F information table 11 according to the second embodiment. As shown in FIG. 7, for example, the input / output I / F information table 11 includes an input I / F of the MAC address conversion device 10, information on a connection destination to which the input I / F is connected, and the input I / F. And the output I / F that outputs the frame received in step 1 is stored in association with each other.

  For example, the input / output I / F information table 11 stores “FastEthernet0 / 0”, “transfer”, and “FastEthernet1 / 0” in association with each other. In this case, since the I / F “FastEthernet0 / 0” is connected to the transfer unit 20 side, the frame received by the I / F “FastEthernet0 / 0” is a frame transmitted from the transfer unit 20 side. Indicates that there is. Further, it indicates that the frame received by the I / F “FastEthernet0 / 0” is output from the I / F “FastEthernet1 / 0”.

  For example, the input / output I / F information table 11 stores “FastEthernet1 / 0”, “S-MAT”, and “FastEthernet0 / 0” in association with each other. In this case, since the I / F “FastEthernet1 / 0” is connected to the other MAC address converter 10 side, the frame received by the I / F “FastEthernet1 / 0” 10 indicates that the frame is transmitted from 10. The frame received by the I / F “FastEthernet1 / 0” indicates that the frame is output from the I / F “FastEthernet0 / 0”.

  The MAC address conversion table 12 stores MAC address conversion information. The MAC address conversion information is used for processing by the transmission source MAC address conversion unit 15 and the destination MAC address conversion unit 16. For example, the source MAC address conversion unit 15 and the destination MAC address conversion unit 16 refer to the MAC address conversion table 12 and convert the MAC address according to the MAC address conversion information.

  The MAC address conversion table 12 shows the MAC address of the virtual machine under the cloud base A when the MAC address converter 10 is installed on the cloud base A side (in the case of the MAC address converter 10-1 shown in FIG. 5), for example. MAC address conversion information for converting addresses is stored (MAC address conversion table for cloud base A). On the other hand, when the MAC address conversion device 10 is installed on the cloud base B side, for example (in the case of the MAC address conversion device 10-2 shown in FIG. 5), the MAC address conversion table 12 is a virtual machine under the cloud base B. MAC address conversion information for converting the MAC address is stored (MAC address conversion table for cloud base B).

  For example, in the MAC address conversion table 12 for the cloud base A, the MAC address that uniquely identifies the virtual machine under the cloud base A within the cloud base A and the virtual machine under the cloud base A within the cloud base B are unique. Are generated by associating one-to-one with the MAC address identified by. Further, for example, the MAC address conversion table 12 for the cloud base B includes the MAC address that uniquely identifies the virtual machine under the cloud base B in the cloud base B, and the virtual machine under the cloud base B in the cloud base A. Is generated by associating one-to-one with the MAC address uniquely identified.

  For example, ARP is performed at each cloud site, and MAC addresses currently used in each cloud site are dynamically collected. Then, the MAC address conversion table 12 can be generated by associating the MAC addresses in use collected at each cloud site on a one-to-one basis for each virtual machine. Alternatively, the MAC address assigned to the virtual machine is statically collected from the cloud management unit or hypervisor provided in each cloud base, and the MAC address conversion table 12 is generated by associating with each virtual machine one to one. can do. The MAC address conversion table 12 is generated and registered in advance by, for example, an operator of the inter-base connection system 1 based on the MAC address information collected in this way.

  FIG. 8 is a diagram for explaining the MAC address conversion table 12 according to the second embodiment. As shown in FIG. 8, for example, the MAC address conversion table 12 stores a MAC address in its own site and a MAC address in the connection destination site in association with each other. For example, in the case of the MAC address conversion table 12 for the cloud base A, the MAC address in the local base is a MAC address that uniquely identifies the virtual machine under the cloud base A in the cloud base A. On the other hand, the MAC address in the connection destination base is a MAC address that uniquely identifies a virtual machine under the cloud base A in the cloud base B. In the second embodiment, the MAC address is assumed to be a 48-bit MAC address, and is represented by a hexadecimal number in FIG.

  Returning to FIG. 6, the frame receiving unit 13 receives a frame. Specifically, the frame reception unit 13 receives a frame from a VPN that can encapsulate a physical line or a frame (for example, an Ethernet (registered trademark) frame), and sends the received frame to the input I / F determination unit 14.

  The input I / F determination unit 14 determines whether the frame transmitted from the frame reception unit 13 is a frame transmitted from the transfer unit 20 or a frame transmitted from another MAC address conversion device 10. judge. Specifically, the input I / F determination unit 14 refers to the input / output I / F information table 11 and determines whether the frame transmitted from the frame reception unit 13 is a frame transmitted from the transfer unit 20 or Then, it is determined whether the frame is transmitted from another MAC address conversion device 10. When the input I / F determination unit 14 determines that the frame is transmitted from the transfer unit 20 side, the input I / F determination unit 14 converts the transmission source MAC address. Send a frame. On the other hand, if the input I / F determination unit 14 determines that the frame is transmitted from another MAC address conversion device 10, the input MAC address conversion unit 16 converts the destination MAC address. Send a frame.

  For example, the input I / F determination unit 14 specifies the input I / F of the frame sent from the frame reception unit 13 as I / F “FastEthernet1 / 0”. Then, the input I / F determination unit 14 refers to the input / output I / F information table 11 using the I / F “FastEthernet1 / 0” and stores it in association with the input I / F “FastEthernet1 / 0”. Get the input I / F connection destination. In the example shown in FIG. 7, the input I / F connection destination is “transfer”. Therefore, the input I / F determination unit 14 determines that the frame transmitted from the frame reception unit 13 is a frame transmitted from the transfer unit 20, and transmits the frame to the transmission source MAC address conversion unit 15.

  The transmission source MAC address conversion unit 15 converts the transmission source MAC address included in the frame transmitted from the input I / F determination unit 14. Specifically, the source MAC address conversion unit 15 refers to the MAC address conversion table 12 and searches whether the source MAC address included in the frame does not correspond to the local MAC address. Then, when the source MAC address included in the frame corresponds to the local MAC address, the source MAC address conversion unit 15 stores the MAC address in the connection destination base stored in association with the local MAC address. And the source MAC address is rewritten to the MAC address in the connection destination base. Thereafter, the source MAC address conversion unit 15 sends the frame to the CRC recalculation unit 17.

  For example, the transmission source MAC address conversion unit 15 uses the transmission source MAC address “00: 01: 02: 03: 04: 05” included in the frame transmitted from the input I / F determination unit 14 to perform the MAC address conversion table. 12, the local MAC address is searched. Then, the source MAC address conversion unit 15 stores the MAC address “00: 02: 03: AA in the connection destination base stored in association with the MAC address“ 00: 01: 02: 03: 04: 05 ”in the local base. : AB: AC "is acquired, and the source MAC address" 00: 01: 02: 03: 04: 05 "is rewritten to" 00: 02: 03: AA: AB: AC ".

  Similarly, when the ARP packet is included in the frame, the transmission source MAC address conversion unit 15 converts the transmission source MAC address included in the frame transmitted from the input I / F determination unit 14.

  The destination MAC address conversion unit 16 converts the destination MAC address included in the frame sent from the input I / F determination unit 14. Specifically, the destination MAC address conversion unit 16 refers to the MAC address conversion table 12 and searches whether the destination MAC address included in the frame does not correspond to the MAC address in the connection destination base. Then, when the destination MAC address included in the frame corresponds to the MAC address in the connection destination base, the destination MAC address conversion unit 16 uses the MAC address in its own base stored in association with the MAC address in the connection destination base. Acquire and rewrite the destination MAC address to the MAC address in its own site.

  For example, the destination MAC address conversion unit 16 uses the destination MAC address “00: 02: 03: AA: AB: AC” included in the frame transmitted from the input I / F determination unit 14 to store the MAC address conversion table 12. Refer to and search for the MAC address in the connection destination base. The destination MAC address conversion unit 16 then stores the MAC address in its own base “00: 01: 02: 03: stored in association with the MAC address in the connection destination base“ 00: 02: 03: AA: AB: AC ”. 04:05 ”is acquired, and the destination MAC address“ 00: 02: 03: AA: AB: AC ”is rewritten to“ 00: 01: 02: 03: 04: 05 ”. Thereafter, the destination MAC address conversion unit 16 sends the frame to the CRC recalculation unit 17.

  Similarly, when the ARP packet is included in the frame, the destination MAC address conversion unit 16 converts the destination MAC address included in the frame transmitted from the input I / F determination unit 14. However, when the ARP packet is an ARP request packet and the destination MAC address is a broadcast address, the destination MAC address conversion unit 16 does not convert the MAC address.

  The CRC recalculation unit 17 recalculates the CRC value using the converted MAC address, and corrects the FCS (Frame Check Sequence) portion of the frame to the CRC value after recalculation. Specifically, when the CRC recalculation unit 17 receives a frame from the transmission source MAC address conversion unit 15 or the destination MAC address conversion unit 16, the transmission source MAC address or the destination MAC address has been rewritten. The CRC value for determining whether the destination MAC address, type, and data are correct values is recalculated, and the FCS unit is corrected to a new source MAC address or a CRC value corresponding to the destination MAC address. Then, the CRC recalculator 17 sends the corrected frame to the frame transmitter 18.

  The frame transmission unit 18 outputs the frame sent from the CRC recalculation unit 17. Specifically, the frame transmission unit 18 refers to the input / output I / F information table 11 and acquires the output I / F stored in association with the input I / F of the frame. Then, the frame transmission unit 18 outputs a frame from the output I / F. For example, the frame transmission unit 18 refers to the input / output I / F information table 11 for the frame received by the I / F “FastEthernet0 / 0” and stores it in association with the I / F “FastEthernet0 / 0”. Get the output I / F “FastEthernet1 / 0”. Then, the frame transmission unit 18 outputs this frame from the I / F “FastEthernet1 / 0”. The output I / F is connected to a VPN capable of encapsulating a physical line or a frame (for example, an Ethernet (registered trademark) frame).

  FIG. 9 is a flowchart illustrating a procedure of MAC address conversion processing according to the second embodiment. As shown in FIG. 9, when receiving the frame (step S101), the MAC address conversion device 10 is a frame transmitted from the transfer unit 20, or a frame transmitted from another MAC address conversion device 10. It is determined whether or not there is (step S102).

  If the frame is a frame transmitted from the transfer unit 20 (Yes at Step S103), the MAC address conversion device 10 refers to the MAC address conversion table 12 and converts the source MAC address included in the frame (Step S103). S104). On the other hand, if the frame is a frame transmitted from another MAC address conversion device 10 (No at step S103), the MAC address conversion device 10 converts the destination MAC address included in the frame with reference to the MAC address conversion table 12 (Step S105).

  Thereafter, the MAC address conversion device 10 recalculates the CRC value, corrects the FCS unit (step S106), and transmits the corrected frame (step S107).

(SingleMAT one-way system)
Subsequently, FIG. 10 is a diagram for explaining a specific example (SingleMAT one-way method) of MAC address conversion according to the second embodiment. As shown in FIG. 10, in the SingleMAT unidirectional method, the inter-base connection system 1 includes, as MAC address conversion devices, a MAC address conversion device 10-11, a MAC address conversion device 10-12, a MAC address conversion device 10-21, And a MAC address conversion device 10-22. Note that the MAC address conversion device 10-11 and the MAC address conversion device 10-12 have a function corresponding to the MAC address conversion device 10-1 in the SingleMAT bidirectional method. It is provided according to the frame transfer direction. Further, the MAC address conversion device 10-21 and the MAC address conversion device 10-22 have a function corresponding to the MAC address conversion device 10-2 in the SingleMAT bidirectional method. It is provided according to the frame transfer direction.

  The MAC address conversion device 10-11 and the MAC address conversion device 10-12 convert the MAC address of the virtual machine under the cloud base A. Specifically, the MAC address conversion device 10-11 converts the source MAC address, and the MAC address conversion device 10-12 converts the destination MAC address. On the other hand, the MAC address conversion device 10-21 and the MAC address conversion device 10-22 convert the MAC address of the virtual machine under the cloud base B. Specifically, the MAC address conversion device 10-21 converts the destination MAC address, and the MAC address conversion device 10-22 converts the source MAC address.

  Note that the MAC address conversion device 10-11, the MAC address conversion device 10-12, the MAC address conversion device 10-21, and the MAC address conversion device 10-22 are all the MAC address conversion devices described with reference to FIG. 10 can be realized. In addition, it is not restricted to the structure shown in FIG. 6, It is good also as a structure provided only with the required part according to the role. For example, since the MAC address conversion device 10-11 and the MAC address conversion device 10-22 respectively convert the source MAC address and not the destination MAC address, the source MAC address conversion unit 15 and the destination MAC address are converted. Of the address converters 16, the transmission source MAC address converter 15 is sufficient. For example, if the input I / F of the frame is also fixed, the input / output I / F information table 11 and the input I / F determination unit 14 are unnecessary.

(Twice MAT bidirectional method)
11 and 12 are diagrams for explaining a specific example (TwiceMAT bidirectional method) of MAC address conversion according to the second embodiment. The configuration at each cloud base is the same as that in FIG. 4 or FIG.

  Here, as shown in FIG. 11, in the TwiceMAT bidirectional method, the inter-base connection system 1 includes a MAC address conversion device 40 as a MAC address conversion device. The MAC address conversion device 40 performs MAC address conversion of both the frame transferred from the cloud base A side to the cloud base B side and the frame transferred from the cloud base B side to the cloud base A side. In the second embodiment, the MAC address conversion device 40 converts both the transmission source MAC address and the destination MAC address. In FIG. 2, for example, the notation [T-MAT AB] means that the method is TwiceMAT, and MAC address conversion of frames transferred between the cloud base A and the cloud base B is performed. Indicates.

  The MAC address conversion of a frame transferred from the cloud base A side to the cloud base B side will be described with reference to FIG. As shown in FIG. 12, since the MAC address for uniquely identifying each virtual machine in each cloud base is the same as that in FIG. 5, the description is omitted.

  First, when the transfer unit 20-1 on the cloud base A side receives the frame transmitted from the virtual machine A-1 under the cloud base A, it is the MAC address included in this frame, and the cloud base A This frame is transferred by switching based on the MAC address “MAC address 3” uniquely identifying the virtual machine B-1 under the base B.

  Next, when receiving the frame transferred by the transfer unit 20-1, the MAC address conversion device 40 refers to the MAC address conversion table, and transmits the source MAC address (SA) and the destination address (DA) included in this frame. Convert.

  For example, the MAC address conversion device 40 refers to the MAC address conversion table for the cloud site A using the source MAC address “MAC address 1” included in the frame, and associates it with “MAC address 1” in its own site. Acquire “MAC address 3” in the registered connection destination base. Then, the MAC address conversion device 40 rewrites the source MAC address “MAC address 1” included in the frame to “MAC address 3”.

  Further, for example, the MAC address conversion device 40 refers to the MAC address conversion table for the cloud base B using the destination MAC address “MAC address 3” included in the frame, and corresponds to “MAC address 3” in the connection destination base. Acquire the registered “MAC address 1” within the base. Then, the MAC address conversion device 40 rewrites the destination MAC address “MAC address 3” included in the frame to “MAC address 1”. Then, the MAC address translation device 40 outputs the rewritten frame from an I / F designated in advance as a pair of I / Fs that have received this frame.

  That is, the MAC address conversion device 40 uses the MAC address “MAC address 1” for uniquely identifying the virtual machine A-1 under the cloud base A within the cloud base A to the virtual under the cloud base A within the cloud base B. The machine A-1 is converted into a MAC address “MAC address 3” uniquely identified. Further, the MAC address conversion device 40 uses the MAC address “MAC address 3” for uniquely identifying the virtual machine B-1 under the cloud base B within the cloud base A to the virtual under the cloud base B within the cloud base B. The machine B-1 is converted into the MAC address “MAC address 1” uniquely identified.

  Then, since the source MAC address or the destination MAC address included in the frame is rewritten, the MAC address conversion device 40 determines whether the source MAC address, the destination MAC address, the type, and the data are correct values. The CRC value is recalculated, and the FCS unit is corrected to the CRC value corresponding to the new source MAC address or destination MAC address.

  Thereafter, when the transfer unit 20-2 on the cloud base B side receives the frame transmitted from the MAC address conversion device 40, it is the MAC address included in this frame, and the virtual under the cloud base B within the cloud base B This frame is transferred by switching based on the MAC address “MAC address 1” uniquely identifying the machine B-1.

  When the frame is a frame including an ARP packet, the MAC address conversion device 40 converts the MAC address included in this frame as in the SingleMAT bidirectional method.

  Here, the MAC address conversion device 40 in the TwiceMAT bidirectional method will be described. FIG. 13 is a diagram for explaining a configuration example of the MAC address conversion device 40 according to the second embodiment.

  The input / output I / F base information table 41 is the input / output I / F information table 11 described with reference to FIG. 6, and the MAC address conversion table 42 is the MAC address conversion table 12 described with reference to FIG. The frame receiver 43 converts the source MAC address to the frame receiver 13 described with reference to FIG. 6, and the input I / F determination unit 44 converts the source MAC address to the input I / F determination unit 14 described with reference to FIG. The unit 45 is the source MAC address conversion unit 15 described using FIG. 6, the destination MAC address conversion unit 46 is the destination MAC address conversion unit 16 described using FIG. 6, and the CRC recalculation unit 47 is The frame retransmitting unit 17 described with reference to FIG. 6 and the frame transmitting unit 48 correspond to the frame transmitting unit 18 described with reference to FIG. For this reason, in the following description, the description similar to the description already mentioned above is omitted.

  Similar to the input / output I / F information table 11, the input / output I / F base information table 41 stores input / output I / F information. The input / output I / F information is used for processing by the input I / F determination unit 44 and the frame transmission unit 48. For example, the input I / F determination unit 44 determines whether the frame received by the MAC address conversion device 40 is input / output I / F information from the cloud base A side or the cloud base B Used to determine whether the frame is transmitted from the side.

  FIG. 14 is a diagram for explaining the input / output I / F base information table 41 according to the second embodiment. As shown in FIG. 14, for example, the input / output I / F base information table 41 includes an input I / F of the MAC address conversion device 40, information on bases to which the input I / F is connected, and the input I / F. And the output I / F that outputs the frame received in step 1 is stored in association with each other.

  For example, the input / output I / F base information table 41 stores “FastEthernet0 / 0”, “A”, and “FastEthernet1 / 0” in association with each other. In this case, since the I / F “FastEthernet0 / 0” is connected to the cloud base A side, the frame received at the I / F “FastEthernet0 / 0” is a frame transmitted from the cloud base A side. Indicates that there is. Further, it indicates that the frame received by the I / F “FastEthernet0 / 0” is output from the I / F “FastEthernet1 / 0”.

  The MAC address conversion table 42 stores MAC address conversion information. The MAC address conversion information is used for processing by the transmission source MAC address conversion unit 45 and the destination MAC address conversion unit 46. FIG. 15 is a diagram for explaining the MAC address conversion table 42 according to the second embodiment. As illustrated in FIG. 15, for example, the MAC address conversion table 42 stores a MAC address in its own site and a MAC address in the connection destination site in association with each other. In the case of the TwiceMAT bidirectional method, the MAC address conversion device 40 performs both conversion of the MAC address of the virtual machine under the cloud base A and conversion of the MAC address of the virtual machine under the cloud base B. Both the MAC address conversion table 42-1 for the site A and the MAC address conversion table 42-2 for the cloud site B are stored.

  FIG. 16 is a flowchart illustrating a procedure of MAC address conversion processing according to the second embodiment. As shown in FIG. 16, when receiving the frame (step S201), the MAC address conversion device 40 is a frame transmitted from the cloud base A side or a frame transmitted from the cloud base B side. Is determined (step S202).

  When the frame is transmitted from the cloud base A side (Yes in step S203), the MAC address conversion device 40 determines the MAC in its own base in the MAC address conversion table for cloud base A (table A in FIG. 16). With reference to the address, the source MAC address included in the frame is converted into the MAC address in the connection destination base stored in association with the MAC address in the local base (step S204).

  Further, the MAC address conversion device 40 refers to the MAC address in the connection destination base of the MAC address conversion table for cloud base B (table B in FIG. 16), and converts the destination MAC address included in the frame to the connection destination base destination MAC. It is converted into the local MAC address stored in association with the address (step S205).

  On the other hand, if the MAC address conversion device 40 is a frame transmitted from the cloud base B side (No in step S203), the MAC address conversion table for the cloud base B (table B in FIG. 16) has its own base MAC. With reference to the address, the source MAC address included in the frame is converted into the MAC address in the connection destination base stored in association with the MAC address in the local base (step S206).

  Further, the MAC address conversion device 40 refers to the MAC address in the connection destination base of the MAC address conversion table for cloud base A (table A in FIG. 16), and converts the destination MAC address included in the frame to the connection destination base destination MAC. It is converted into the local MAC address stored in association with the address (step S207).

  Thereafter, the MAC address conversion device 40 recalculates the CRC value, corrects the FCS unit (step S208), and transmits the corrected frame (step S209).

(TwiceMAT one-way system)
Next, FIG. 17 is a diagram for explaining a specific example (TwiceMAT one-way method) of MAC address conversion according to the second embodiment. As shown in FIG. 17, in the TwiceMAT one-way method, the inter-base connection system 1 includes a MAC address conversion device 40-1 and a MAC address conversion device 40-2 as MAC address conversion devices. The MAC address conversion device 40-1 and the MAC address conversion device 40-2 have a function corresponding to the MAC address conversion device 40 in the TwiceMAT bidirectional method. It is provided according to the frame transfer direction.

  The MAC address conversion device 40-1 performs MAC address conversion of a frame transferred from the cloud base A to the cloud base B. On the other hand, the MAC address conversion device 40-2 performs MAC address conversion of a frame transferred from the cloud base B to the cloud base A.

  Note that both the MAC address conversion device 40-1 and the MAC address conversion device 40-2 can be realized by the same configuration as the MAC address conversion device 40 described with reference to FIG. In addition, it is not restricted to the structure shown in FIG. 13, It is good also as a structure provided only with the part required according to a role. For example, if the input I / F of the frame is fixed, the input / output I / F base information table 41 and the input I / F determination unit 44 are unnecessary.

(Effect of 2nd Embodiment)
As described above, the inter-base connection system 1 according to the second embodiment first performs switching according to the MAC address used independently in the cloud base on the transmission side, and after switching, the MAC address included in the frame is changed. Convert. The converted MAC address is a MAC address that is used independently in the destination cloud base. For this reason, the inter-base connection system 1 performs switching according to the converted MAC address and transfers the frame toward the destination virtual machine.

  As described above, the inter-base connection system 1 uses both the source MAC address and the destination MAC address included in the frame from the MAC address used independently in the source-side cloud base, and the destination-side cloud base. To the MAC address that is used independently in the network, and outputs the frame after the MAC address conversion to the destination cloud base.

  For this reason, according to the second embodiment, since the MAC address only needs to be uniquely assigned within each cloud site, duplication of the MAC address can be appropriately solved. In other words, according to the second embodiment, even if the MAC addresses used at each cloud site overlap, the MACs used (or used) by the connected cloud sites. There is no need to pay attention to the address.

  For example, when the inter-base connection system 1 according to the second embodiment is not applied, the cloud bases that are subject to the MAC address duplication investigation are not limited to the cloud bases belonging to the applied connection between one cloud base, and each cloud There was a possibility of extending to a cloud base belonging to a connection between different cloud bases already established at the base. In this regard, according to the second embodiment, since the MAC address only needs to be uniquely assigned in each cloud base, the cloud base that is the target of the MAC address duplication investigation is a cloud that belongs to the connection between one cloud base. Limited to bases. For example, when there is an application for connection between cloud bases, a MAC address conversion device installed between the corresponding cloud bases is investigated for unduplicated and unused MAC addresses in each cloud base belonging to the connection between the cloud bases. What is necessary is just to add to the MAC address conversion table.

  Further, for example, when the inter-base connection system 1 according to the second embodiment is not applied, there is a possibility that the MAC address cannot be reassigned when an unduplicated and unused MAC address is exhausted. Further, in this case, whether or not the MAC address is non-overlapping and unused is determined not only in each cloud site but also in the whole including each cloud site. In this regard, according to the second embodiment, since the MAC address only needs to be uniquely assigned in each cloud base, a situation of non-duplicated and unused MAC addresses is unlikely to occur.

  Further, for example, when the inter-base connection system 1 according to the second embodiment is not applied, there is a possibility that the service must be interrupted when accompanied by a change of the MAC address of the operating virtual machine. In this regard, according to the second embodiment, since the MAC address only needs to be uniquely assigned within each cloud site, a situation in which the MAC address of the operating virtual machine must be changed is unlikely to occur.

(Other embodiments)
By the way, the inter-base connection system 1 described above may be implemented in various different forms other than the above-described embodiments.

  In the above-described embodiment, the example in which the inter-base connection system 1 connects two bases to each other has been described, but the embodiment is not limited thereto. For example, when connecting three bases, base A, base B, and base C, MAC addresses are uniquely assigned in base A, base B, and base C. That is, when the terminal in the base A communicates with both the terminal under the base B and the terminal under the base C, the MAC address assigned to the terminal under the base A within the local base A, the terminal under the base B The MAC address assigned to and the MAC address assigned to the terminal under the base C are unique.

  A case where three or more bases are connected to each other will be specifically described. The MAC address conversion device is installed at every two sites. For example, as illustrated in FIG. 4, in the case of the SingleMAT bidirectional method, a set of the MAC address conversion device 10-1 and the MAC address conversion device 10-2 is installed between the cloud base A and the cloud base B. Further, for example, as shown in FIG. 10, in the case of the SingleMAT one-way method, the MAC address conversion device 10-11, the MAC address conversion device 10-12, and the MAC address conversion device between the cloud base A and the cloud base B. 10-21 and a set of MAC address translation device 10-22 are installed. The same applies to the TwiceMAT bidirectional method and the TwiceMAT one-way method. Thus, since the MAC address conversion device is installed in units of two bases, when connecting three or more bases to each other, after organizing the two bases, which are units in which the MAC address conversion device is installed, Consider installing a MAC address translation device.

For example, when connecting 3 cloud bases, cloud base X, cloud base Y, and cloud base Z, first, a set of virtual machines that are connected to each other is input as an entry for connection application between cloud bases. These are enumerated. For example,
-Virtual machine X-1 in cloud base X and virtual machine Y-1 in cloud base Y
-Virtual machine X-2 in cloud base X and virtual machine Z-1 in cloud base Z
-Virtual machine X-3 in cloud base X and virtual machine Z-2 in cloud base Z
Is enumerated.

Next, the listed virtual machine groups are organized into connections in units of two sites. For example,
・ Connection between cloud base X and cloud base Y ・ Connection and arrangement between cloud base X and cloud base Z

  After that, a MAC address conversion device corresponding to each method is installed between the two sites. Further, the MAC address conversion device installed between the two sites may store the MAC address conversion table for each cloud site, as in the above-described embodiment. Note that the above-described organization and generation of the MAC address conversion table for each cloud site may be performed in advance by, for example, the operator of the inter-base connection system 1. Alternatively, for example, the data may be automatically arranged and generated by a program that is automatically generated from an entry for a connection request between cloud bases.

  In the embodiment described above, the processing procedure described with reference to FIGS. 9 and 16 can be arbitrarily changed. For example, in FIG. 16, the processing procedure for converting the destination MAC address after converting the transmission source MAC address has been described (for example, steps S204 to S205), but the embodiment is not limited to this. For example, it may be a processing procedure for converting the source MAC address after converting the destination MAC address.

  In the second embodiment, the inter-base connection system 1 may be configured such that the transfer unit 20-1 and the transfer unit 20-2 are installed at each cloud base. For example, the transfer unit 20-1 and the transfer unit 20-2 may be realized as functions of a hypervisor. Further, the inter-base connection system 1 may have a configuration in which one of the transfer unit 20-1 and the transfer unit 20-1 is installed at a cloud base.

  In addition, each component of each illustrated apparatus is functionally conceptual, and does not necessarily need to be physically configured as illustrated. That is, the specific form of distribution / integration of each device is not limited to the one shown in the figure, and all or a part of the distribution / integration may be functionally or physically distributed in arbitrary units according to various loads or usage conditions. Can be integrated and configured. For example, the MAC address conversion unit 10, the transfer unit 20-1, and the transfer unit 20-2 illustrated in FIG. 1 in the first embodiment may all be the same device.

[program]
In addition, it is possible to create a program in which processing executed by the MAC address converter according to the above-described embodiment is described in a language that can be executed by a computer. In this case, the same effect as that of the above-described embodiment can be obtained by the computer executing the program. Further, such a program may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer and executed to execute the same processing as in the above-described embodiment. Hereinafter, an example of a computer that executes a program that realizes the same function as that of the MAC address conversion apparatus illustrated in FIG. 6 or FIG. 13 will be described.

  FIG. 18 is a diagram illustrating a computer that executes a program for converting a MAC address. As shown in FIG. 18, the computer includes, for example, a memory, a CPU (Central Processing Unit), a hard disk drive interface, a disk drive interface, a serial port interface, a video adapter, and a network interface. Are connected by a bus.

  As shown in FIG. 18, the memory includes a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM stores a boot program such as BIOS (Basic Input Output System). The hard disk drive interface is connected to the hard disk drive as shown in FIG. The disk drive interface is connected to the disk drive as shown in FIG. For example, a removable storage medium such as a magnetic disk or an optical disk is inserted into the disk drive. As shown in FIG. 18, the serial port interface is connected to, for example, a mouse and a keyboard. As shown in FIG. 18, the video adapter is connected to a display, for example.

  Here, as shown in FIG. 18, the hard disk drive stores, for example, an OS, an application program, a program module, and program data. That is, the above-described program is stored in, for example, a hard disk drive as a program module in which a command to be executed by a computer is described. For example, a procedure for executing information processing similar to that of the frame receiving unit 13 illustrated in FIG. 6, a procedure for executing information processing similar to that of the input I / F determination unit 14, and Procedures for executing information processing, procedures for executing information processing similar to that of the destination MAC address conversion unit 16, procedures for executing information processing similar to that of the CRC recalculation unit 17, and information processing similar to that of the frame transmission unit 18 Is stored in the hard disk drive.

  In addition, various data (for example, data stored in the input / output I / F information table 11 and the MAC address conversion table 12) held by the MAC address conversion device described in the above-described embodiment is, for example, a memory or a hard disk as program data. Stored in the drive. Then, the CPU reads program modules and program data stored in the memory and hard disk drive to the RAM as necessary, and executes each procedure.

  Note that the program modules and program data related to the above-described program are not limited to being stored in the hard disk drive, but may be stored in, for example, a removable storage medium and read out by the CPU via the disk drive or the like. Alternatively, the program module and program data related to the above-described program are stored in another computer connected via a network (LAN (Local Area Network), WAN (Wide Area Network), etc.), and the CPU is connected via a network interface. May be read.

1 Inter-base connection system 10 MAC address conversion device 20-1 transfer unit 20-2 transfer unit

Claims (6)

A MAC (Media Access Control) address conversion device in a system for transferring a frame transmitted from a terminal subordinate to a source base to a terminal subordinate to a destination base,
When a frame transferred from the transmission source site is received, the MAC address included in the frame and the terminal under the transmission source site and the terminal under the destination site are uniquely identified within the transmission source site A MAC address conversion apparatus comprising: a MAC address conversion unit that converts an address into a MAC address that uniquely identifies a terminal under the transmission source site and a terminal under the destination site within the destination site.   After the MAC address is converted by the MAC address conversion unit, a CRC (Cyclic Redundancy Check) value is recalculated using the converted MAC address, and the FCS (Frame Check Sequence) unit of the frame is recalculated. The MAC address conversion apparatus according to claim 1, further comprising a CRC recalculation unit that corrects the CRC value of the MAC address.   When the frame is a frame including an ARP (Address Resolution Protocol) request packet, the MAC address conversion unit converts a source MAC address included in the frame into a MAC address used in the destination base, and an ARP response 3. The MAC address according to claim 1, wherein when the frame includes a packet, both the source MAC address and the destination MAC address included in the frame are converted into a MAC address used in the destination base. Conversion device. A MAC address conversion method executed by a MAC address conversion device in a system for transferring a frame transmitted from a terminal subordinate to a source base toward a terminal subordinate to a destination base,
When a frame transferred from the transmission source site is received, the MAC address included in the frame and the terminal under the transmission source site and the terminal under the destination site are uniquely identified within the transmission source site A MAC address conversion method comprising a MAC address conversion step of converting an address into a MAC address that uniquely identifies a terminal subordinate to the transmission source base and a terminal subordinate to the destination base within the destination base.   A MAC address conversion program for causing a computer to function as the MAC address conversion device according to claim 1. A base-to-base connection system that connects a plurality of bases to each other and forwards frames transmitted from terminals under the source base toward the terminals under the destination base.
When a frame transmitted from a terminal subordinate to the transmission source site is received, a path control based on the MAC address included in the frame and uniquely identifying the terminal subordinate to the destination site within the transmission source site A source transfer unit for transferring the frame,
When the frame transferred by the source transfer unit is received, the MAC address included in the frame and the terminal subordinate to the source base and the terminal subordinate to the destination base are uniquely identified within the source base A MAC address conversion device that converts a MAC address into a MAC address that uniquely identifies a terminal under the transmission source base and a terminal under the destination base within the destination base;
When receiving a frame in which the MAC address is converted by the MAC address conversion unit, the path control is based on the MAC address included in the frame, and the terminal under the destination base is uniquely identified in the destination base. And a destination transfer unit that transfers the frame.

Images