JP2020088573A - Data point movement system and data point movement method - Google Patents

Abstract

To provide a method for efficiently moving a data point.SOLUTION: A data point movement system comprises: a relay switch Sa which can connect a port to a termination device of a WAN circuit A of a movement source in a movement switch 110; a relay switch Sb which can connect the port to the termination device of a WAN circuit B of the movement source; a relay switch Ra which can connect the port to the termination device of the WAN circuit A of a movement destination; a relay switch Rb which can connect the port to the termination device of the WAN circuit B of the movement destination; a communication circuit C which connects between the relay switches Sa and Sb; a communication circuit D which connects between the relay switches Ra and Rb; and a management part which blocks a data transmission of the communication circuit C for a ring-type network coupling the relay switches Sa, Sb, Ra, and Rb via the WAN circuits A and B and the communication circuits C and D, establishes active relay paths which relay the relay data by separating it into the WAN circuits A and B, and thereby obtains a ring structure at a normal time.SELECTED DRAWING: Figure 3

Description

The present invention relates to a data base migration system and a data base migration method.

Conventionally, there is known a technique of relaying data using a WAN (Wide Area Network) line.
For example, Patent Document 1 discloses "a relay technique for connecting the own device and a core network by an access network of a plurality of WAN lines, switching the access networks, and relaying data."

JP, 2014-049940, A

When a cloud operator or the like relocates a large-scale server between data bases, it takes a transition period of about 1 to 3 years so as not to hinder the daily server operation of many customers. Sometimes.

During this transition period, it is preferable to provide the customer with a similar service regarding communication and use of the server, regardless of whether the server is the source or the destination.
Therefore, in addition to relaying a large amount of data for server relocation, it is necessary to relay communication and server data without delay between the data base migration source and migration destination.

In order to meet such a demand, it is necessary to contract a telecommunications carrier company for the installation of a high-speed dedicated line between the data base migration source and the migration destination, resulting in high costs.

FIG. 13 is a diagram showing an example of installation of dual lines×3 lines for migrating data bases.
In the figure, in the data base 100 of the migration source, in addition to the large capacity relay data 101 for data migration, the relay data 102 for layer 2 (L2) extension and the relay data 103 for normal communication exist. .. In the data base 200 of the transfer destination, relay data 201 for L2 extension and relay data 203 for normal communication exist in addition to the relay data 201 for data transfer as the receiving side corresponding to the transfer source.

In order to transfer at least these three types of data for each purpose, three WAN lines 301 to 303 are installed. Sub-lines are prepared for each of these three WAN lines 301 to 303. These sub lines cannot be used together with the main line because they are substitutes for line failure of the main line. Since the line service using such a highly reliable dual line is expensive, the cost of migrating the data base becomes even higher.

Further, the above-mentioned data for L2 extension is relayed to maintain the same environment (IP address) at the migration source and the migration destination. By this L2 extension, the network range of Layer 2 is expanded to the migration destination via the WAN line. Therefore, there is a problem that a layer 2 failure is easily propagated to the migration destination. If this fault extends to the WAN line, the WAN line will be overloaded, and the fault will propagate to other WAN lines using the same WAN line in a chain.

Therefore, an object of the present invention is to provide a technique for efficiently migrating data bases.

In order to solve the above-mentioned problems, one of the typical data base migration systems of the present invention is a data base migration system that relays relay data between a migration source and a migration destination of a data base. A relay switch Sa that can connect a port to the terminating device of the original WAN line A, a relay switch Sb that can connect a port to the terminating device of the migration source WAN line B, and a port to the terminating device of the migration destination WAN line A. Of the relay switch Ra, the relay switch Rb capable of connecting a port to the terminating device of the destination WAN line B, the communication line C connecting the relay switches Sa and Sb, and the relay switches Ra and Rb. Blocking the data transfer of the communication line C with respect to the ring type network in which the communication line D connecting between them and the relay switches Sa, Sb, Ra and Rb are connected via the WAN lines A and B and the communication lines C and D. Then, a management unit is provided which establishes both active relay routes for relaying the relay data separately to the WAN lines A and B to establish a normal ring configuration.

The present invention enables efficient migration of data bases.
Problems, configurations, and effects other than those described above will be clarified in the following description of the embodiments.

It is a whole figure of the data base transfer system of this embodiment. It is an internal schematic diagram of data bases 100 and 200. It is a figure which shows the relay route at the time of normal. 6 is a flowchart showing operations at the time of occurrence of link down and recovery. It is explanatory drawing which shows the occurrence state of link down. It is a figure which shows the provisional route at the time of link down. It is a figure which shows the ring structure at the time of link-up (restoration). 6 is a flowchart showing the operation when a loop occurs and when a timeout occurs. It is a figure which shows a mode that the line failure generate|occur|produced in the WAN line. It is a figure which shows the temporary route at the time of timeout. 6 is a flowchart illustrating a loop detection frame discarding operation. It is a figure which shows a mode that a loop detection frame is discarded. It is a figure which shows the example of installation for dual line x 3 lines.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of the data base migration system of this embodiment.
In the figure, WAN lines A and B contracting with a communication carrier company are provided between a data base 100 that is a migration source environment and a data base 200 that is a migration destination environment. Each of the WAN lines A and B is a single line.

FIG. 2 is an internal schematic diagram of the data bases 100 and 200.
In the figure, in the data base 100 of the migration source, in addition to the large-capacity relay data 101 for data migration, the relay data 102 for layer 2 (L2) extension and the relay data 103 for normal communication are used. Separately, it occurs at any time. In the data base 200 of the transfer destination, relay data 201 for L2 extension and relay data 203 for normal communication are generated at any time in addition to the relay data 201 for data transfer as the receiving side corresponding to the transfer source.
A VLAN (Virtual LAN) ID is assigned to each of these at least three types of data in units of data frames, depending on the type of use.

A migration switch 110 connected to the WAN lines A and B is provided in the migration source data site 100. A migration switch 210 connected to the WAN lines A and B is provided in the migration destination data base 200.

These transfer switches 110 and 210 have a function of distinguishing three types of relay data (data transfer, L2 extension, and normal communication) to be transmitted to the WAN lines A and B into the WAN lines A and B by distinguishing them according to the VLAN ID. Have.

The WAN line A relays relay data for normal communication by the distribution processing of the migration switches 110 and 210. The WAN line B relays two types of relay data for L2 extension and data migration.
Due to the distribution function of the transfer switches 110 and 210, both WAN lines A and B have both active configurations of the main line.

Note that the roles of these WAN lines A and B are not fixed, and the roles can be reversed in the distribution function of the transfer switches 110 and 210. Due to this inversion, the WAN line A is used for two types of data relay for L2 extension and data migration. The WAN line B is used for data relay for normal communication.

The migration switches 110 and 210 distinguish three types of data (data migration, L2 extension, and normal communication) received from the WAN lines A and B by VLAN IDs, and are network devices at the data bases 100 and 200. It also has the function of distributing to.

<Normal ring configuration>
FIG. 3 is a diagram showing a relay path in the transfer switches 110 and 210 in a normal state.
In the figure, relay switches Sa and Sb whose ports are communicatively connected to the terminating devices N of the WAN lines A and B are arranged inside the migration source migration switch 110. A communication line C connects the relay switches Sa and Sb for communication.

In addition, relay switches Ra and Rb whose ports are communicatively connected to the respective terminating devices N of the WAN lines A and B are arranged inside the migration destination switch 210. A communication line D connects the relay switches Ra and Rb for communication.

Here, the four relay switches Sa, Sb, Ra, Rb are connected via the WAN lines A, B and the communication lines C, D to form a ring network.

In this ring network, any one of the four relay switches Sa, Sb, Ra, and Rb (preferably one of the transfer source relay switches Sa and Sb) is set as the master switch, and the remaining three are aware switches. Is set to.
In the description below, it is assumed that the relay switch Sa is set as a master switch and the remaining three relay switches Sb, Ra, Rb are set as aware switches. (Hereinafter, the relay switch Sa is referred to as "master switch Sa")

The control unit in the master switch Sa functions as the management unit 1. The management unit 1 cooperates with the remaining relay switches Sb, Ra, and Rb to change the ring configuration settings and control the ring configuration.

The master port M of the master switch Sa is connected to the terminating device N of the WAN line A. The slave port S of the master switch Sa is connected to the communication line C. The management unit 1 sets the slave port S in the blocking state.
The slave port S set to the blocking state blocks the data transfer in the communication line C by inhibiting the relay of at least three types of relay data (for normal communication, for L2 extension, and for data transfer). This blocking prevents a looped loop condition.

In this state, the relay data for normal communication is relayed through the relay path including the master switch Sa, the WAN line A, and the relay switch Ra.

Further, the relay data for L2 extension and data migration is relayed through the relay path including the relay switch Sb, the WAN line B, and the relay switch Rb.

Through the series of operations described above, a ring configuration at normal time (normal time) is established as both active communication paths.

Next, as line failures that may occur in such a ring configuration, (1) link down, (2) loop state, and (3) failure countermeasures against hello timeout will be described in order.

<Operation explanation when link is down>
First, the operation when a link down occurs in the data base migration system will be described.

FIG. 4A is a flowchart showing the operation of the management unit 1 when a link down occurs.
The operation of the management unit 1 will be described according to the step numbers shown in FIG.

Step S111: First, when a failure occurs in the connection port of any relay switch in the ring configuration, the connection port of the relay switch and its counterpart port are physically in a non-relayable down state. Therefore, one of the WAN lines A and B that has passed through this connection port (hereinafter referred to as "unused WAN line") cannot be used.

FIG. 5 is an explanatory diagram showing the occurrence state of this link down.
In the figure, the connection port of the relay switch Ra (the connection port with the WAN line A) is linked down. Therefore, the WAN line A cannot be used.

Step S112: When the relay switch connected to the link-down connection port (hereinafter referred to as “abnormal port”) or the remaining connection ports of the failed relay switch detects this link-down, a link-down notification frame (a type of control frame) ) Is sent through a route around the ring that does not go through the abnormal port.

Step S113: The slave port S of the master switch Sa can receive the link-down notification frame even in the blocking state in which the relay of the data frame (for normal communication, L2 extension, and data transfer) is suppressed.

The management unit 1 switches the slave port S that has received the link-down notification frame to a forwarding state in which a data frame (for normal communication, L2 extension, and data transfer) is relayed. As a result, a temporary route that bypasses the faulty abnormal port is established on the ring configuration by following the route that is behind the ring that the link-down notification frame has followed.

FIG. 6 is a diagram showing a provisional route at the time of this link down.
In the figure, the provisional route passes through the master switch Sa, the relay switch Sb, the WAN line B, and the relay switch Rb. The ports connected to the unused WAN lines are still in the down state.

For the data frame that used the unused WAN line (for normal communication in FIG. 6), the management unit 1 changes the internal setting to use this provisional route, so that the state in which relaying is impossible due to link down is provisional. Is resolved.

<Operation explanation at link up>
Next, the operation when the abnormal port is linked up (restored) will be described.

FIG. 4B is a flowchart showing the operation of the management unit 1 at the time of linkup (restoration).
The operation of the management unit 1 will be described according to the step numbers shown in FIG.

Step S121: The abnormal port which is linked down is linked up (restored). This linked up state is shown in FIG.

Step S122: The management unit 1 notifies the ring and rewrites the internal setting of the relay switch so that the abnormal port and the port connected through the unused WAN line are brought into the listening state until the restoration is confirmed. Set once.
In this listening state, the relay of the data frame is disabled and the control frame such as the hello frame is enabled to communicate.
In FIG. 7, the master port M of the master switch Sa is in the listening state.

Step S123: A hello frame that goes around the ring is transmitted from the master port M. The slave port S receives this hello frame via the abnormal port, whereby the recovery of the abnormal port is confirmed. The management unit 1 returns the slave port S that has received the hello frame to the normal state (blocking state).
As a result, the data relay on the provisional route via the communication line C is blocked.

Step S124: The fact that the slave port S has returned to the normal state (blocking state) is notified on the ring by the control frame.

Step S125: After receiving the notification of the control frame, the management unit 1 changes the master port M to the forwarding state. As a result, it returns to the normal ring configuration (FIG. 3).

Regarding the data frame that used the temporary route (for normal communication in FIG. 7), the management unit 1 changes the internal setting so that the route at the normal time is used, and thus the original normal state is restored.

<Operation when loop is detected>
Next, the operation when the loop state is detected in the ring configuration will be described.
FIG. 8A is a flowchart for explaining detection and handling of a loop state by the network device.
The operation of the network device will be described according to the step numbers shown in FIG.

Step S131: The network device is a device that relays data by using the ring network including the relay switch. Such a network device sends the loop detection frame addressed to itself to the ring via the relay switch.

Step S132: If the ring configuration is normal, the slave port S of the master switch Sa is in the blocking state, so that the network device does not receive the loop detection frame addressed to itself. In that case (YES side of S132), the network device confirms that the ring configuration is normal.

On the other hand, when a loop state occurs in the ring configuration, the loop detection frame addressed to itself returns to the network device after going around the ring. In this case, the network device shifts the operation to step S133.

Step S133: The network device determines that the ring configuration is in a loop state, closes the port that received the loop detection frame, and suspends the use of the ring configuration.

<Operation when detecting hello timeout>
Next, the operation at the time of detecting the hello timeout will be described.
FIG. 8B is a flowchart showing the operation of the management unit 1 when detecting a hello timeout.
The operation of the management unit 1 will be described according to the step numbers shown in FIG.

Step S141: First, a failure occurs in the WAN line.
FIG. 9 is a diagram showing how a line failure occurs in a WAN line.
As shown in the figure, the WAN line A is a single line. Therefore, the WAN line A itself does not have a sub-line that substitutes for a line failure.

Step S142: Further, since the terminating device 420 (see FIG. 9) is interposed between the WAN line A and the master switch Sa, this line failure is not automatically detected.

Step S143: On the other hand, the master switch Sa periodically sends a hello frame (a type of control frame) that goes around the ring from the master port M to the slave port S in order to confirm the state of the ring configuration.

Step S144: If there is no line failure in the middle, the slave port S receives the hello frame regularly, so that the hello timeout does not occur. However, if there is a line failure on the way, the hello frame cannot complete the ring configuration and the slave port S does not receive the hello frame. In this case, the management unit 1 detects the hello timeout when the preset timeout time elapses.

Step S145: The location of the line failure that causes the hello timeout cannot be identified without information.
Therefore, the management unit 1 shifts the slave port S from the normal state (blocking) to the forwarding state. As a result, all the ports of the relay switch on the ring are in the forwarding state, and a provisional route that bypasses the location of the line failure behind the ring is established.

FIG. 10 is a diagram showing a provisional route at the time of timeout.
In the figure, the provisional route passes through the network device 430, the master switch Sa, the relay switch Sb, the WAN line B, the relay switch Rb, the relay switch Ra, and the network device 440.

For the data frame that cannot be relayed due to the line failure (for normal communication in FIG. 10), the management unit 1 changes the internal setting to use this provisional path, so that the relay failure due to the line failure is provisional. Resolve.

<Operation when timeout is resolved>
Next, the operation when the hello timeout is resolved will be described.
FIG. 8C is a flowchart showing the operation of the management unit 1 when the hello timeout is resolved.
The operation of the management unit 1 will be described according to the step numbers shown in FIG.

Step S151: The line failure of the WAN line is recovered.

Step S152: Due to the restoration of the WAN line, all the ports of the relay switch on the ring are connected in the forwarding state, so a loop state occurs on the ring.

Step S153: The master switch Sa periodically sends a hello frame (a type of control frame) that goes around the ring from the master port M to the slave port S in order to confirm the state of the ring configuration.

Step S154: Due to the restoration of the WAN line failure, the slave port S of the master switch Sa receives this hello frame. Therefore, elimination of the hello timeout is detected by the master switch Sa.

Step S155: The management unit 1 restores the slave port S, which has received the hello frame, to the blocking state, thereby changing the ring configuration from the provisional route at time-out (see FIG. 10) to the route at normal time (see FIG. 3). return.

For the data frame that used the temporary path (for normal communication in FIG. 10), the management unit 1 changes the internal setting so that the normal path is used, and thus the line failure due to the hello timeout is resolved.

<Comparative example without discarding loop detection frame>
Next, a comparative example will be described with reference to a problem that a loop state is temporarily generated when the hello timeout is restored.
FIG. 11A is a flowchart showing a comparative example in which the loop detection frame is not discarded.
Description will be given along the step numbers shown in FIG.

Step S161: The line failure of the WAN line is recovered.

Step S162: Due to the restoration of the WAN line, all the ports of the relay switch on the ring are connected in the forwarding state. Therefore, a loop state occurs temporarily (from the moment to several seconds) from the time when the line failure that causes the hello timeout is restored to the time when the ring configuration returns to the normal state.

Step S163: The network device may also send the loop detection frame addressed to itself through the relay switch even during this loop state.

Step S164: Since a loop state has occurred in the ring configuration, the loop detection frame addressed to itself sent by the network device to the ring configuration goes around the ring and returns to the network device.

Step S165: The network device determines that the ring configuration is in the loop state and closes the port that has received the loop detection frame. Therefore, the operation of the network device is hindered.

<Operation to discard the loop detection frame>
Next, the operation of discarding the loop detection frame in this embodiment will be described.
FIG. 11B is a flowchart showing the operation of discarding the loop detection frame by the management unit 1.
The operation of the management unit 1 will be described according to the step numbers shown in FIG.

Step S171: The network device sends the loop detection frame addressed to itself through the relay switch.

Step S172: When the management unit 1 receives the loop detection frame transferred on the ring, the management unit 1 confirms the states of the master port M and the slave port S.
When both the master port M and the slave port S are in the forwarding state, the master switch Sa shifts the operation to step S173.
In other cases, the master switch Sa shifts the operation to step S174.

Step S173: The management unit 1 determines from the port state of the master switch Sa that there is a high possibility of a temporary loop state when the hello timeout is restored, and discards the loop detection frame as shown in FIG.
Therefore, the problem that the operation of the network device 430 is hindered by the temporary loop state when the hello timeout is restored does not occur.

Step S174: It is clear from the port state of the master switch Sa that the loop detection frame is not in the temporary loop state when the hello timeout is restored, and therefore it is not necessary to discard the loop detection frame.
Therefore, the management unit 1 permits the transfer of the loop detection frame. As a result, the loop detection operation in normal times is performed without any trouble.
<Effects of the embodiment>

(1) As described above, in the data base migration system (method) of the embodiment, the existing WAN lines A and B of the communication carrier company are used as they are, and the relay switches Sa, By arranging Sb, Ra, Rb, the communication lines C, D, and the management unit 1, a ring network that spans the data source migration source and migration destination can be configured.

(2) In the embodiment, by managing the relay switches Sa, Sb, Ra, and Rb of the ring network from the migration source or migration destination, it is possible to perform data relay while maintaining high redundancy.
For example, under normal conditions, the WAN lines A and B are actively used to relay the relay data. Since the WAN lines A and B are originally independent single lines, they can independently perform data communication in parallel, and the amount of data transfer can be efficiently increased. As a result, the utilization rate of services provided to customers is improved.

(3) In the embodiment, since the ring network is configured via the WAN lines A and B, the relay route of the data relay by the WAN lines A and B can be made redundant. Therefore, in addition to the relay routes used in parallel by both active WAN lines A and B, the relay route only for WAN line A, the relay route only for WAN line B, and the like are set in the relay switches Sa, Sb, Ra, and Rb. It can be freely selected by switching. Therefore, even if one of the WAN lines A and B becomes unrelayable due to maintenance or a line failure, it becomes possible to continue the data relay using the remaining WAN lines.

(4) Even if one of the WAN lines A and B becomes unusable in preparation for maintenance or line failure, data can be relayed using the remaining WAN lines. Therefore, there is little need to double the WAN lines A and B individually. Therefore, by using a single line for each of the WAN lines A and B, it is possible to reduce the cost of line use without using a dual line with a high fee.

(5) A further characteristic point is that the WAN lines A and B can be switched only by changing the settings of the relay switches Sa, Sb, Ra, and Rb, and the existing WAN lines A and B themselves of the communication carrier company can be used. The point is that no special modification or operation is performed. Therefore, the general-purpose WAN lines A and B can be used as they are without any trouble.

(6) In the embodiment, the relay data for L2 extension is exchanged between the transfer source and the transfer destination in addition to the data transfer. Ring type redundancy can also be applied to this relay data for L2 extension. Therefore, even if one of the WAN lines A and B cannot be relayed due to maintenance or a line failure, it is possible to perform a safe Layer 2 extension using the remaining WAN lines.

(7) Furthermore, when a layer 2 failure that occurs in the source and destination environments propagates through the WAN line, data concentrates on the WAN line and the line load exceeds the allowable level. In such a case, it is possible to take advantage of the ring-type redundancy and make a situation by temporarily suspending the data relay of the L2 extension while giving priority to the data relay other than the L2 extension. As a result, it becomes possible to localize the failure by preventing the influence propagation of the failure of the layer 2.

(8) In the embodiment, (relay data for L2 extension+relay data for data migration) is frame-multiplexed and transmitted to one WAN line. Therefore, when the WAN line goes down due to the influence of fault propagation in layer 2, relay data for L2 extension and relay data for data transfer cannot be relayed. However, unlike data for information communication, relay data for data transfer does not require real-time processing so much. Therefore, the relay data for data migration can be sent again later within the data base migration period. Therefore, even if the data transfer data cannot be relayed temporarily, the harmful effect can be recovered and the actual damage does not occur.

(9) Further, in the embodiment, the relay data for information communication and the (relay data for L2 extension+relay data for data transfer) are divided into highly independent WAN lines A and B, which are two single lines. Transfer. Therefore, even if one WAN line is down due to the influence of layer 2 fault propagation, the other surviving highly independent WAN line can be used to transfer data for information communication without delay. It will be possible.

(10) In the embodiment, when a link down is detected, the WAN line that passes through the abnormal port that is linked down is not used, and a temporary route that bypasses the abnormal port and relays data is established. As a result, it becomes possible to appropriately deal with the occurrence of the link down and to continue the data relay provisionally.

(11) Further, in the embodiment, when the abnormal port is restored, the port connected to the abnormal port through the unused WAN line cannot be relayed, while the control frame is set to the listening state in which the communication is possible and restored. Confirm the recovery of the abnormal port by communicating the control frame for confirmation. Therefore, in an unstable state in which the abnormal port repeats normal and abnormal, it is not quickly judged to be normal, and there is no error such as returning to the normal ring configuration in the unstable state.

(12) In addition, in the embodiment, when the recovery of the abnormal port is confirmed, the data transfer of the communication line C is first blocked, and then the port set to the listening state is set to the forwarding state, whereby the ring in the normal state is set. Revert to configuration. With this stepwise processing, the data transfer of the communication line C is blocked first, so there is no risk of a loop state occurring during the return to the normal ring configuration.

(13) In the embodiment, when a hello time-out is detected, the data transfer of the communication line C is permitted to establish a temporary route that bypasses the place where the time-out occurs behind the ring and establish the ring configuration at the time of time-out. As a result, it is possible to appropriately deal with the occurrence of the hello timeout and tentatively continue the data relay.

(14) In the embodiment, the loop detection frame transferred in the ring is discarded during the period from the establishment of the ring configuration at the time of timeout to the return to the ring configuration at the normal time. During the period from the elimination of the hello timeout to the return to the normal ring configuration, a loop state temporarily occurs in the ring configuration. By discarding the loop detection frame at least during this period, it is possible to prevent the network device or the relay switch, which has detected the loop state, from blocking the port and making the relay impossible.

(15) The migration switch 210 of the embodiment has substantially the same device configuration as the migration switch 110. Therefore, by preparing two migration switches 110 (or equivalent products) and connecting them to the termination devices of the migration destination and migration source WAN lines A and B, respectively, the data base migration system of the embodiment is simply configured. be able to. In this case, by setting one of the two transition switches 110 (or equivalent) on the master side, one control unit of the relay switches Sa and Sb in the transition switch 110 on the master side functions as the management unit 1. Thus, the relay operation of the data base migration system of the embodiment is realized.

<Supplementary information of the embodiment>
In addition, in the above-described embodiment, the case where a single line is used as the WAN lines A and B has been described, but the present invention is not necessarily limited to this. A dual line may be used for one or both of the WAN lines A and B in order to cope with a wide-area line fault in which two WAN lines A and B are simultaneously faulty.

Further, in the above-described embodiment, the WAN lines A and B are distributed according to uses such as data migration, L2 extension, and normal communication, but the present invention is not limited to this. The data may be distributed to the WAN lines A and B by time or capacity according to the line load state of the WAN lines A and B. For example, when the data transfer amount for L2 extension and normal communication becomes small in a time zone such as at night, a large amount of relay data for data transfer is distributed to WAN lines A and B to transfer relay data for data transfer. The transfer speed may be improved.

Furthermore, in the above-described embodiment, the connection between the WAN line terminating device and the relay switch port may be terminal connection using an optical fiber or an electric cable, or may be wireless connection.

Furthermore, in the above-described embodiment, the connection between the WAN line terminating device and the relay switch port may be terminal connection using an optical fiber or an electric cable, or may be wireless connection. The WAN line may be a wireless carrier, an optical line, an electric line, or a combination thereof.

Further, in the above-described embodiment, the hello frame or the like is specified and described as the control frame, but the present invention is not limited to this. A default control frame or a control frame defined by the system may be used.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail and specifically for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations and procedures described.

A... WAN line, B... WAN line, C... Communication line, D... Communication line, M... Master port, S... Slave port, 1... Management unit, Ra... Relay switch, Sa... Relay switch (master switch), Rb ... relay switch, Sb... relay switch, 100... data base, 110... migration switch, 200... data base, 210... migration switch

Claims (15)

A data base migration system for relaying relay data between a data base migration source and a migration destination,
A relay switch Sa capable of connecting a port to the terminating device of the WAN line A arranged at the transfer source;
A relay switch Sb capable of connecting a port to the terminating device of the WAN line B arranged at the transfer source;
A relay switch Ra capable of connecting a port to the terminating device of the WAN line A arranged at the migration destination;
A relay switch Rb capable of connecting a port to the terminating device of the WAN line B arranged at the migration destination;
A communication line C connecting between the relay switches Sa and Sb,
A communication line D connecting between the relay switches Ra and Rb;
With respect to a ring type network in which the relay switches Sa, Sb, Ra, Rb are connected via the WAN lines A, B and the communication lines C, D, the data transfer of the communication line C is blocked and the relay data is blocked. A management unit that establishes both active relay routes for relaying the above-mentioned WAN lines A and B separately and has a ring configuration in a normal state,
A data base migration system comprising: In the data base migration system according to claim 1,
The data base migration system, wherein each of the WAN lines A and B is a single line. The data base migration system according to any one of claims 1 to 2,
The relay data includes three types of relay data for normal communication, L2 extension, and data transfer,
The management unit is
The data transfer of the communication line C is blocked, the relay data for normal communication is relayed on one of the WAN lines A and B, and the relay data for L2 extension and the data transfer is relayed to the WAN line A, A data base migration system, characterized in that both active relay paths are established by relaying on the other side of B, and the ring configuration in the normal state is established. The data base migration system according to any one of claims 1 to 3,
The management unit is
When a link-down abnormal port is detected in the ring configuration, a temporary route for bypassing the abnormal port and relaying the relay data is established, and the ring configuration at the time of link-down is set. Base transfer system. In the data base migration system according to claim 4,
The management unit is
A port connected to the abnormal port is set to a listening state in which the relay data is not relayable while the control frame is transferable,
Confirm the restoration of the abnormal port by transferring the control frame,
When the recovery of the abnormal port is confirmed, after blocking the data transfer of the communication line C, the port set to the listening state is put into the forwarding state to restore the normal ring configuration. Data base migration system. The data base migration system according to any one of claims 1 to 5,
The management unit is
Monitoring the control frame timeout in the ring configuration,
When the time-out is detected, the transfer of data through the communication line C is permitted to establish a provisional route that bypasses the location where the time-out occurs, thereby forming a ring configuration at the time-out. Migration system. In the data base migration system according to claim 6,
The management unit is
Monitoring the resolution of the control frame timeout in the ring configuration,
When it detects that the timeout has been resolved, it returns to the normal ring configuration,
A data base migration system, wherein a loop detection frame transferred in the ring network is discarded during a period from establishment of the ring configuration at the time-out to return to the normal ring configuration. In order to move the data base, at least two WAN lines A and B that relay the relay data between the migration source and the migration destination, and a relay switch Sa that connects a port to the terminating device of the WAN line A at the migration source. A relay switch Sb that connects a port to the terminating device of the WAN line B at the transfer source, a relay switch Ra that connects a port to the terminating device of the WAN line A at the transfer destination, and the WAN line at the transfer destination. A relay switch Rb for connecting a port to the terminating device of B, a communication line C for communication connection between the relay switches Sa and Sb, and a communication line D for communication connection between the relay switches Ra and Rb are provided. Using a ring network,
A management step of blocking the data transfer of the communication line C and establishing both active relay paths for dividing and relaying the relay data to the WAN lines A and B to establish a normal ring configuration. How to migrate data bases. In the data base migration method according to claim 8,
A data base migration method, wherein a single line is used for each of the WAN lines A and B. The data base migration method according to any one of claims 8 to 9,
The relay data includes three types of relay data for normal communication, L2 extension, and data transfer,
The management step is
The data transfer of the communication line C is blocked, the relay data for normal communication is relayed on one of the WAN lines A and B, and the relay data for L2 extension and the data transfer is relayed to the WAN line A, A method for migrating data bases, characterized in that by relaying on the other side of B, both active relay paths are established to form the ring configuration in the normal state. The data base migration method according to any one of claims 8 to 10,
When a link-down abnormal port is detected in the ring configuration, a link-down countermeasure step is provided to establish a temporary route for bypassing the abnormal port and relaying the relay data, and setting the ring configuration at the time of the link-down. A method for migrating data bases characterized by the above. In the data base migration method according to claim 11,
The link down countermeasure step is
A port connected to the abnormal port is set to a listening state in which the relay data is not relayable while the control frame is transferable,
Confirm the restoration of the abnormal port by transferring the control frame,
When the recovery of the abnormal port is confirmed, after blocking the data transfer of the communication line C, the port set to the listening state is put into the forwarding state to restore the normal ring configuration. Data base migration method. The data base migration method according to any one of claims 8 to 12,
When the time-out of the control frame in the ring configuration is monitored, and when the time-out is detected, the data transfer of the communication line C is permitted to establish a provisional route that bypasses the location where the time-out occurs, and when the time-out occurs. The method for migrating data bases is characterized in that it has a time-out countermeasure step with a ring configuration. In the data base migration method according to claim 13,
The time-out countermeasure step is
Monitoring the resolution of the control frame timeout in the ring configuration,
When it detects that the timeout has been resolved, it returns to the normal ring configuration,
A method of migrating data bases, wherein a loop detection frame transferred in the ring network is discarded during a period from establishment of the ring configuration at the time-out to return to the normal ring configuration. A transition switch comprising the relay switch Sa according to any one of claims 1 to 7, the relay switch Sb, the communication line C, and the management unit.

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