JP7118868B2 - Data base migration system and data base migration method - Google Patents

Description

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

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

JP 2014-049940 A

When a cloud service provider or the like implements a large-scale server relocation between data bases, it takes about 1 to 3 years for the transition period so as not to interfere with the daily server operations of many customers. Sometimes.

During this transition period, it is preferable to provide similar services to customers regarding communications and server usage, regardless of whether the server is at the source or destination.
Therefore, in addition to relaying a large amount of data for server relocation, communication and server data must be relayed without delay between the migration source and the migration destination of the data base.

In order to meet such demands, it was necessary to make a contract with a communication carrier company to lay a high-speed dedicated line between the source and the destination of the data base, which required high costs.

FIG. 13 is a diagram showing an example of installation of dual lines×3 lines for migrating data bases.
In the same figure, in addition to large-capacity relay data 101 for data migration, relay data 102 for layer 2 (L2) extension and relay data 103 for normal communication exist at a migration source data base 100. . In addition to the relay data 201 for data migration, the relay data 202 for L2 extension and the relay data 203 for normal communication exist at the migration destination data base 200 as the receiving side corresponding to the migration source.

Three WAN lines 301 to 303 are laid in order to transfer at least three types of data for each application. A sub-line is prepared for each of these three WAN lines 301-303. These secondary lines cannot be used together with the main line, as they are a substitute for line failure of the main line. Such reliable dual-line line service is expensive, making the cost of migrating data locations even more expensive.

Further, the data for L2 extension described above is relayed in order to maintain the same environment (IP address) between the migration source and the migration destination. This L2 extension extends the layer 2 network coverage to the migration destination via the WAN line. Therefore, there is a problem that layer 2 faults are easily propagated to the migration destination. If this failure reaches the WAN line, the WAN line will be overloaded, and the failure will propagate to other WAN lines using the same WAN line in a chain reaction.

Accordingly, it is an object of the present invention to provide a technology for efficiently migrating data bases.

In order to solve the above-mentioned problems, one representative data site migration system of the present invention is a data site migration system that relays relay data between a migration source and a migration destination of a data site. A relay switch Sa whose port can be connected to the terminating device of the original WAN circuit A, a relay switch Sb whose port can be connected to the terminating device of the migration source WAN circuit B, and a port of the terminating device of the WAN circuit A of the migration destination. , a relay switch Rb whose port can be connected to the terminating device of the destination WAN line B, a communication line C connecting between 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 connecting the communication line D connecting between the and a management unit that divides and relays the relay data to WAN lines A and B, establishes both active relay paths, and establishes a normal ring configuration.

The present invention makes it possible to efficiently migrate data bases.
Problems, configurations, and effects other than those described above will be clarified in the following description of the embodiments.

1 is an overall view of a data base migration system of this embodiment; FIG. 2 is an internal schematic diagram of data bases 100 and 200. FIG. It is a figure which shows the relay path|route at the time of normal. FIG. 10 is a flow chart showing operations when a link down occurs and when the link is restored; FIG. FIG. 10 is an explanatory diagram showing a link-down occurrence state; FIG. 10 is a diagram showing temporary routes at the time of link down; FIG. 4 is a diagram showing a ring configuration at the time of linkup (restoration); FIG. 10 is a flowchart showing operations when a loop occurs and when a timeout occurs; FIG. FIG. 3 is a diagram showing a state in which a line failure has occurred in a WAN line; FIG. 10 is a diagram showing a provisional route at time-out; FIG. 11 is a flow chart for explaining an operation of discarding a loop detection frame; FIG. FIG. 10 is a diagram showing how loop detection frames are discarded; FIG. 3 is a diagram showing an example of laying dual lines×3 lines;

Hereinafter, embodiments of the invention will be described based on 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 contracted with a communication carrier company are provided between a data base 100, which is the source environment, and a data base 200, which is the destination environment. Each of the WAN lines A and B is a single line.

FIG. 2 is an internal schematic diagram of the data sites 100 and 200. As shown in FIG.
In the same figure, in addition to large-capacity relay data 101 for data migration, relay data 102 for layer 2 (L2) extension and relay data 103 for normal communication are used in the data base 100 of the migration source. Occurs from time to time. In addition to relay data 201 for data migration, relay data 202 for L2 extension and relay data 203 for normal communication are generated as needed at the migration destination data site 200 as a receiving side corresponding to the migration source.
To these at least three types of data, a VLAN (Virtual LAN) ID is assigned to each data frame for each type of use.

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

These shift switches 110 and 210 have the function of distinguishing three types of relay data (for data migration, for L2 extension, and for normal communication) to be transmitted to WAN lines A and B by VLAN ID and distributing them to WAN lines A and B. have.

WAN line A relays the relay data for normal communication by the sorting process of the shift switches 110 and 210 . Also, the WAN line B relays two types of relay data for L2 extension and data migration.
Due to the sorting function of the transition switches 110 and 210, both WAN lines A and B are both active as main lines.

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

In addition, migration switches 110 and 210 distinguish three types of data (for data migration, for L2 extension, and for normal communication) received from WAN lines A and B by VLAN IDs, and distribute them to network devices on the side of data bases 100 and 200. It also has the function of distributing to

<Normal ring configuration>
FIG. 3 is a diagram showing relay paths in the transition switches 110 and 210 during normal operation.
In the figure, relay switches Sa and Sb, whose ports are communicatively connected to terminating devices N of WAN lines A and B, respectively, are arranged inside the migration switch 110 of the migration source. A communication line C is used to connect the relay switches Sa and Sb.

Further, relay switches Ra and Rb are arranged inside the shift switch 210 of the shift destination, the ports of which are communicatively connected to the terminating devices N of the WAN lines A and B, respectively. A communication line D establishes communication connection between these relay switches Ra and Rb.

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

In this ring network, one of the four relay switches Sa, Sb, Ra, and Rb (preferably one of the relay switches Sa and Sb of the migration source) is set as the master switch, and the remaining three are aware switches. is set to
In the following description, it is assumed that the relay switch Sa is set as the master switch and the remaining three relay switches Sb, Ra, and Rb are set as aware switches. (Hereinafter, the relay switch Sa will be referred to as the “master switch Sa”)

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

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

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

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

Through the series of operations described above, a normal (normal) ring configuration is established as a bi-active communication path.

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

<Description of operation at link down>
First, the operation when a link down occurs in the data base migration system will be described.

FIG. 4A is a flow chart showing the operation of the management section 1 when a link down occurs.
The operation of the management unit 1 will be described along the step numbers shown in the figure.

Step S111: First, when a failure occurs in the connection port of any relay switch on the ring configuration, the connection port of the relay switch and its partner port go down, physically disabling relay. Therefore, one of the WAN lines A and B (hereinafter referred to as "unused WAN line") via this connection port becomes unusable.

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 is in an unusable state.

Step S112: When the relay switch connected to the link-down connection port (hereinafter referred to as "abnormal port") and the remaining connection ports of the failed relay switch detect this link-down, they receive a link-down notification frame (a type of control frame). ) is sent out through the ring backpath route that does not go through the abnormal port.

Step S113: The slave port S of the master switch Sa can receive this link-down notification frame even in a blocking state that inhibits relaying of data frames (for normal communication, for L2 extension, and for data migration).

The management unit 1 switches the slave port S, which has received the link-down notification frame, to a forwarding state for relaying data frames (for normal communication, for L2 extension, and for data migration). As a result, a provisional route bypassing the faulty port is established on the ring configuration by following the ring-back route followed by the link-down notification frame.

FIG. 6 is a diagram showing temporary routes at the time of this link down.
In the figure, the provisional route passes through the master switch Sa, relay switch Sb, WAN line B, and relay switch Rb. Note that the port connected to the unused WAN line remains in the down state.

For data frames that used the unused WAN line (for normal communication in FIG. 6), the management unit 1 changes the internal settings so that this temporary route is used. to be resolved.

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

FIG. 4B is a flow chart showing the operation of the management unit 1 at the time of linkup (restoration).
The operation of the management unit 1 will be described along the step numbers shown in the figure.

Step S121: The link-down abnormal port 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 settings of the relay switch, thereby putting the port connected to the abnormal port via the unused WAN line into a listening state until recovery is confirmed. Set once.
This listening state is a state in which relaying of data frames is prohibited, while communication of control frames such as hello frames is permitted.
In FIG. 7, the master port M of the master switch Sa is in the listening state.

Step S123: From this master port M, a hello frame is transmitted around the ring. The recovery of the abnormal port is confirmed by the slave port S receiving this hello frame via the abnormal port. The management unit 1 restores the slave port S that received the hello frame to the normal state (blocking state).
As a result, the data relay of the provisional route via the communication line C is blocked.

Step S124: A control frame notifies the ring that the slave port S has returned to the normal state (blocking state).

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, the normal ring configuration (FIG. 3) is restored.

As for the data frames (for normal communication in FIG. 7) using the provisional route, the management unit 1 changes the internal settings so that the normal route is used, thereby returning to the original normal state.

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

Step S131: The network device is a device that relays data using a ring network with relay switches. Such a network device transmits a loop detection frame addressed to itself onto the ring via a relay switch.

Step S132: If the ring configuration is normal, the slave port S of the master switch Sa is in a blocking state, so the network device will 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, if a loop state occurs in the ring configuration, the loop detection frame addressed to itself loops around the ring and returns to the network device. In this case, the network device proceeds 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 use of the ring configuration.

<Operation when hello timeout is detected>
Next, the operation when hello timeout is detected will be described.
FIG. 8B is a flowchart showing the operation of the management section 1 when hello timeout is detected.
The operation of the management unit 1 will be described along the step numbers shown in the figure.

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, WAN line A is a single line. Therefore, the WAN line A itself does not have a sub-line to substitute for when a line failure occurs.

Step S142: Furthermore, since the termination 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 kind of control frame) that goes around the ring from the master port M to the slave port S in order to check the state of the ring configuration.

Step S144: If there is no line failure on the way, the slave port S receives hello frames periodically, so hello timeout does not occur. However, if there is a line failure on the way, the hello frame cannot go around the ring structure and the slave port S does not receive the hello frame. In this case, the management unit 1 detects a hello timeout when a preset timeout period elapses.

Step S145: Without information, it is impossible to identify the location of the line failure that is the cause of the hello timeout.
Therefore, the management unit 1 causes the slave port S to transition from the normal state (blocking) to the forwarding state. As a result, all the ports of the relay switches on the ring are in the forwarding state, and a provisional path is established that bypasses the line failure point in the back of the ring.

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

For a data frame (for normal communication in FIG. 10) that cannot be relayed due to a line failure, the management unit 1 changes the internal settings so that this provisional route is used. to resolve.

<Operation when timeout is canceled>
Next, the operation when the hello timeout is canceled will be described.
FIG. 8[C] is a flowchart showing the operation of the management unit 1 when the hello timeout is canceled.
The operation of the management unit 1 will be described along the step numbers shown in the figure.

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 switches 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 kind of control frame) that circulates 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: The slave port S of the master switch Sa receives this hello frame as the line failure of the WAN line is recovered. Therefore, the cancellation of the hello timeout is detected by the master switch Sa.

Step S155: The management unit 1 restores the slave port S that 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 normal route (see FIG. 3). return.

For the data frames (for normal communication in FIG. 10) using the temporary route, the management unit 1 changes the internal settings so that the normal route is used, thereby eliminating the line failure due to the hello timeout.

<Comparison example without discarding loop detection frames>
Next, a comparative example will be given to explain the problem that a loop state temporarily occurs when the hello timeout is restored.
FIG. 11A is a flowchart showing a comparative example in which loop detection frames are not discarded.
Description will be made along the step numbers shown in the figure.

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 switches on the ring are connected in the forwarding state. Therefore, a loop state occurs temporarily (from an instant to several seconds) during the period from when the line fault that caused the hello timeout is restored until the ring configuration returns to a normal state.

Step S163: Even during this loop state period, the network device may transmit a loop detection frame addressed to itself via the relay switch.

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 circulates the ring and returns to the network device.

Step S165: The network device determines that the ring configuration is in a loop state, and blocks the port that received the loop detection frame. As a result, the operation of the network equipment is disturbed.

<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 flow chart showing the operation of discarding the loop detection frame by the management unit 1. FIG.
The operation of the management unit 1 will be described along the step numbers shown in the figure.

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

Step S172: The management unit 1 checks the states of the master port M and the slave port S when receiving the loop detection frame transferred on the ring.
If both the master port M and the slave port S are in the forwarding state, the master switch Sa moves the operation to step S173.
Otherwise, the master switch Sa moves to step S174.

Step S173: The management section 1 determines from the port status of the master switch Sa that there is a high possibility of a temporary loop status at the time of recovery from the hello timeout, and discards the loop detection frame as shown in FIG.
Therefore, the problem of interfering with the operation of the network device 430 due to a temporary loop state at the time of recovery from the hello timeout does not occur.

Step S174: Since it is clear from the port state of the master switch Sa that there is no temporary loop state at the time of recovery from the hello timeout, there is no need to discard the loop detection frame.
Therefore, the management unit 1 permits transfer of the loop detection frame. As a result, the normal loop detection operation can be performed without any trouble.
<Effects of 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 and Sa are connected to the data base migration source and destination. By arranging Sb, Ra, and Rb, communication lines C and D, and the management unit 1, a ring-type network can be constructed that spans the migration source and the migration destination of the data base.

(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, in a normal state, relay data is relayed using WAN lines A and B in both active states. Since the WAN lines A and B are originally independent single lines, they can independently perform data communication in parallel, and can efficiently increase the amount of data transfer. As a result, the availability of services provided to customers is improved.

(3) In the embodiment, since a ring network is constructed via WAN lines A and B, relay paths for data relay by WAN lines A and B can be made redundant. Therefore, in addition to the relay routes that are used in parallel by both active WAN lines A and B, a relay route of only WAN line A, a relay route of only WAN line B, etc. 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 unable to relay due to maintenance or line failure, data relay can be continued using the remaining WAN line.

(4) Thus, even if one of the WAN lines A and B becomes unusable due to maintenance or line failure, the remaining WAN line can be used to relay data. Therefore, there is little need to make each of the WAN lines A and B dual lines. Therefore, by using a single line for each of the WAN lines A and B, it is possible to reduce the line usage cost without using a dual line with a high usage fee.

(5) A further characteristic point is that line switching between the WAN lines A and B is completed by switching the settings of the relay switches Sa, Sb, Ra, and Rb. The point is that no special modification or operation is performed. Therefore, general-purpose WAN lines A and B can be used as they are without any trouble.

(6) In the embodiment, relay data for L2 extension is also exchanged between the transfer source and the transfer destination in addition to data migration. Ring-type redundancy is also possible for the relay data for this L2 extension. Therefore, even if one of the WAN lines A and B becomes unable to relay due to maintenance or line failure, safe layer 2 extension can be performed using the remaining WAN line.

(7) Furthermore, if a layer 2 failure that occurs in the migration source and migration destination environments is propagated through the WAN line, the data will concentrate on the WAN line and the line load will exceed the allowable level. In such a case, it is possible to take advantage of the ring-type redundancy, give priority to data relay other than the L2 extension, and suspend the data relay of the L2 extension to settle the situation. As a result, it becomes possible to localize the failure by preventing the effect propagation of the failure in Layer 2. FIG.

(8) In the embodiment, (relay data for L2 extension + relay data for data migration) are frame-multiplexed and transmitted over one WAN line. Therefore, when the WAN line goes down due to the influence of failure propagation in layer 2, the relay data for data migration cannot be relayed together with the relay data for L2 extension. However, unlike data for information communication, relay data for data migration does not require much real-time processing. Therefore, the relay data for data migration can be resent later within the migration period of the data base. Therefore, even if the data for data migration cannot be relayed temporarily, the damage can be recovered and no actual damage will occur.

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

(10) In the embodiment, when a link-down is detected, the WAN line passing through the link-down abnormal port is made unused, and a temporary route is established for relaying data by detouring the abnormal port. As a result, it is possible to appropriately cope with occurrence of link down and to continue data relay provisionally.

(11) Further, in the embodiment, when the abnormal port is recovered, the port connected to the abnormal port via the unused WAN line is disabled from relaying, while the control frame is set to the listening state to enable communication, and the port is restored. The recovery of the abnormal port is confirmed by communication of the control frame for confirmation. Therefore, in an unstable state in which an abnormal port repeats normal and abnormal states, it is not prematurely determined to be normal, and an error such as returning to the normal ring configuration in an unstable state does not occur.

(12) In addition, in the embodiment, when the restoration 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 to restore the normal ring state. Revert to configuration. With this step-by-step processing, the data transfer on the communication line C is blocked first, so there is no possibility of a loop state occurring during the return to the normal ring configuration.

(13) In the embodiment, when a hello timeout is detected, data transfer on the communication line C is permitted, thereby establishing a provisional route that bypasses the location where the timeout occurred in the back of the ring, thereby forming a ring configuration for timeout. As a result, it is possible to appropriately handle the occurrence of hello timeout and continue data relay provisionally.

(14) Furthermore, in the embodiment, loop detection frames transferred within the ring are discarded during the period from the establishment of the ring configuration at time-out to the return to the normal ring configuration. During the period from the cancellation of the hello timeout until the normal ring configuration is restored, a loop state temporarily occurs in the ring configuration. By discarding the loop detection frame for at least this period, it is possible to prevent the network device or relay switch detecting the loop state from blocking the port and disabling the relay.

(15) The transfer switch 210 of the embodiment has substantially the same device configuration as the transfer switch 110 . Therefore, by preparing two migration switches 110 (or equivalent) and connecting them to the terminating devices of the WAN lines A and B of the migration destination and the migration source respectively, the data site migration system of the embodiment can be configured easily. be able to. In this case, by setting one of the two transition switches 110 (or equivalent) to the master side, the control unit of one 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 site migration system of the embodiment is realized.

<Supplementary matter of the embodiment>
In the above-described embodiment, the case of using single lines as the WAN lines A and B has been described, but the present invention is not necessarily limited to this. Dual lines may be used on one or both of the WAN lines A and B to handle wide area line failures such that two WAN lines A and B experience line failures at the same time.

In addition, in the above-described embodiment, the WAN lines A and B are allocated according to usage 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 according to the state of the line load of the WAN lines A and B according to time or capacity. For example, when the amount of data transferred for L2 extension and normal communication is low during times of the day, such as at night, a large amount of relay data for data migration can be allocated to WAN lines A and B to reduce the amount of relay data for data migration. Transfer speed may be improved.

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

Furthermore, in the above-described embodiments, the connection between the terminating device of the WAN line and the port of the relay switch may be a terminal connection using an optical fiber or an electric cable, or may be a 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, a hello frame or the like is specified as a control frame and explained, but the present invention is not limited to this. A default control frame or a system-specific control frame may be used.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above embodiments have been described in detail and specifically for the sake of easy understanding of the present invention, 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 (11)

A data base migration system that relays relay data between a data base migration source and a migration destination,
a first relay switch capable of connecting a port to a terminal device of the first WAN line arranged at the migration source;
a second relay switch capable of connecting a port to a second WAN line terminating device arranged at the migration source;
a third relay switch capable of connecting a port to the terminal device of the first WAN line arranged at the migration destination;
a fourth relay switch whose port can be connected to the second WAN line terminating device arranged at the migration destination;
a first communication line connecting between the first and second relay switches ;
a second communication line connecting between the third and fourth relay switches ;
a first port connected to the first communication line and a second port connected to a terminating device of the first WAN line as ports of the first relay switch;
for a ring network in which the first to fourth relay switches are connected via the first and second WAN lines and the first and second communication lines , A management unit that sets a second port to a blocking state, establishes both active relay paths for dividing and relaying the relay data to the first and second WAN lines, and establishes a normal ring configuration. When,
with
The management department
monitoring the timeout of the control frame in the ring configuration, and when the timeout is detected, by permitting the data transfer of the first communication line to establish a temporary route bypassing the location where the timeout occurs, and at the time of the timeout with a ring configuration of
monitoring the elimination of the timeout of the control frame in the ring configuration, and when detecting the elimination of the timeout, returning the ring configuration to the normal state, and determining whether the first port and the second port are in a forwarding state; When it is determined that both the first port and the second port are in the forwarding state, during the period from establishing the ring configuration at timeout to returning to the normal ring configuration Discard loop detection frames forwarded within the ring network
A data base migration system characterized by: In the data base migration system according to claim 1,
The data center migration system, wherein each of the first and second WAN lines is a single line. In the data base migration system according to claim 1 or 2 ,
The relay data includes three types of relay data for normal communication, L2 extension and data migration,
The management department
Blocking data transfer on the first communication line, relaying the relay data for normal communication on one of the first and second WAN lines, and relaying for L2 extension and data migration A data site transfer system, wherein relaying data on the other of said first and said second WAN lines establishes both active relay paths to achieve said normal ring configuration. In the data base migration system according to any one of claims 1 to 3,
The management department
Data characterized in that, when an abnormal port with a link down is detected in the ring configuration, a provisional route is established for relaying the relay data by detouring the abnormal port, and the ring configuration at the time of the link down is established. Base migration system. In the data base migration system according to claim 4,
The management department
setting the port connected to the abnormal port to a listening state in which the relay data cannot be relayed but the control frame can be transferred;
confirming recovery 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 first communication line, the port set in the listening state is set in the forwarding state to return to the normal ring configuration. Characteristic data base migration system. At least two first and second WAN lines for relaying relay data between a migration source and a migration destination for transferring data sites, and a port connected to a terminating device of the first WAN line at the migration source. a second relay switch connecting a port to the second WAN line terminating device at the migration source; and connecting a port to the first WAN line terminating device at the migration destination. a fourth relay switch that connects a port to the terminal device of the second WAN line at the migration destination; and a third relay switch that connects the communication between the first and second relay switches. one communication line, a second communication line that connects the third and fourth relay switches, and a first communication line that is connected to the first communication line as a port of the first relay switch. and a second port connected to the first WAN line terminating device,
A management step of setting the second port to a blocking state, establishing a bi-active relay path for dividing and relaying the relay data to the first and second WAN lines, and establishing a normal ring configuration. When,
By monitoring the timeout of the control frame in the ring configuration and detecting the timeout, by permitting the data transfer of the first communication line, a provisional path bypassing the location where the timeout occurred is established and the timeout is established. and a time-out countermeasure step with a time ring configuration,
The timeout countermeasure step further includes:
monitoring control frame timeout resolution in the ring configuration;
When the timeout cancellation is detected, returning to the normal ring configuration,
determining whether the first port and the second port are in the forwarding state, and if it is determined that both the first port and the second port are in the forwarding state, the ring at timeout; A loop detection frame transferred within the ring network during the period from establishment of the configuration to return to the normal ring configuration is discarded.
A data base migration method characterized by: In the data base migration method according to claim 6,
using a single line for each of said first and said second WAN lines
A data base migration method characterized by: In the data base migration method according to claim 6 or 7,
The relay data includes three types of relay data for normal communication, L2 extension and data migration,
The managing step includes:
Blocking data transfer on the first communication line, relaying the relay data for normal communication to one of the first and second WAN lines, and relaying data for L2 extension and data migration are relayed to the other of the first and second WAN lines to establish both active relay paths to form the normal ring configuration. Method. In the data base migration method according to any one of claims 6 to 8 ,
a link-down countermeasure step of establishing a provisional route for relaying the relay data by detouring the abnormal port when an abnormal port with a link-down is detected in the ring configuration, and setting the ring configuration at the time of the link-down;
A data base migration method characterized by: In the data base migration method according to claim 9 ,
The link-down countermeasure step includes:
setting the port connected to the abnormal port to a listening state in which the relay data cannot be relayed but the control frame can be transferred;
confirming recovery of the abnormal port by transferring the control frame;
When the restoration of the abnormal port is confirmed, after blocking the data transfer of the first communication line, the port set in the listening state is put in the forwarding state, thereby returning the ring configuration to the normal state.
A data base migration method characterized by: A communication device comprising the first relay switch, the second relay switch, the first communication line, and the management section according to any one of claims 1 to 5.
A transition switch characterized by:

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