WO2014187247A1

WO2014187247A1 - Disaster recovery method and system of wireless controller

Info

Publication number: WO2014187247A1
Application number: PCT/CN2014/077173
Authority: WO
Inventors: 张凯
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-05-20
Filing date: 2014-05-09
Publication date: 2014-11-27
Also published as: CN104185196B; CN104185196A

Abstract

The present invention relates to a disaster recovery method and system of a wireless controller. The method comprises: an active wireless controller synchronizing key service data to a standby wireless controller through a synchronization channel pre-established by the active wireless controller and the standby wireless controller; the standby wireless controller constructing other required related service data according to the received key service data; the active wireless controller and the standby wireless controller detecting whether the active wireless controller side has an exception by using a link detection mechanism, wherein if yes, the standby wireless controller is switched to the active wireless controller to avoid service interruption. The present invention reduces the impact brought by an AP, so that the active wireless controller efficiently and reliably synchronizes data without affecting the service processing, and the standby wireless controller is avoided from being configured again, thereby reducing mistakes, saving the labor cost, avoiding interruption of the wireless service, and improving system reliability.

Description

TECHNICAL FIELD The present invention relates to the field of computer network communication technologies, and in particular, to an efficient and reliable disaster tolerance method and system for a wireless controller. BACKGROUND OF THE INVENTION Existing wireless local area network (WLAN) networking is generally implemented by a wireless access point (Access Pont, AP) and a wireless controller (Access Controller, AC). In the AC+AP networking mode, the AP implements “zero configuration”, and the AC completes functions such as authentication, configuration, and data forwarding for wireless users, and plays a centralized control role to support the AP to achieve more value-added. business. The CAPWAP link can be established and communicated between the AC and the AP through the Controlling and Provisioning of Wireless Access Pont (CAPWAP). Figure 1 is a schematic diagram of a typical wireless network networking structure. As shown in Figure 1, in an Ethernet network, an AC is connected to multiple APs through a switch, and the AP communicates with wireless users wirelessly to provide wireless services. The AC stores the service data of the AP and the wireless user registered with it to maintain the wireless service, and the wireless service is interrupted to avoid the link failure or the AC failure. At the same time, as the AP and the wireless user continue to increase, the AC system Disaster tolerance, especially efficient and reliable disaster recovery needs are increasingly strong. The more common disaster recovery solution in the prior art is shown in FIG. 2, that is, the AP establishes an active/standby communication channel with the primary wireless controller (active AC) and the standby wireless controller (standby AC) at the same time, and the primary wireless control is used. The device sends the service data to the AP, and the AP sends the service information to the standby wireless controller through the backup channel. After the AP detects that the communication with the active wireless controller is interrupted, the AP switches the alternate communication channel to continue as the primary communication channel. Keep wireless business. This solution mainly implements the forwarding of service data through the AP. Although the technical solution is simple, the AP burden is increased, and the active/standby switchover takes place only after the AP detects that the communication with the active AC is interrupted, resulting in the wireless service. Interrupted, and the AC's disaster recovery is controlled by the AP and cannot be connected to APs of other vendors. In addition, for the disaster recovery solution of the AC, the prior art also has a scheme of directly designating the primary AC and the standby AC. The primary and backup ACs have the same configuration, and the primary AC directly sends data to the standby AC, and the standby AC receives the data and stores it. . When the primary AC fails, switch to the standby AC to continue to maintain the service. Although the method is simple to implement, there is still a problem of wireless service interruption. Moreover, AC as a core control device requires a large amount of synchronous service data, and this solution may impose an excessive burden on the primary AC and affect the processing of the service. . SUMMARY OF THE INVENTION A primary object of the embodiments of the present invention is to provide an efficient and reliable wireless controller disaster tolerance method and system. In order to achieve the above object, the present invention provides a wireless controller disaster tolerance method, including: the primary wireless controller synchronizes key service data to the standby wireless controller by using a synchronization channel established in advance with the standby wireless controller; The standby wireless controller constructs other required related service data according to the received key service data; the primary wireless controller and the standby wireless controller detect the primary wireless controller by using a link detection mechanism Whether the side is abnormal, and if so, the standby wireless controller switches to the primary wireless controller to keep the service uninterrupted. Preferably, the step of the primary wireless controller synchronizing the key service data to the standby wireless controller comprises: the primary wireless controller batch synchronizing all the cached key service data in a predetermined time with the lightest system load ; and real-time synchronization of newly generated small batches of key business data. Preferably, the method further comprises: the primary wireless controller adjusting the transmission rate according to the load level of the current system in the process of synchronizing data. Preferably, the key service data includes at least AP information and STA information. Preferably, the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through a link detection mechanism, and if yes, the standby wireless controller switches to a primary wireless controller. The step of maintaining the service uninterrupted includes: the primary wireless controller and the standby wireless controller performing heartbeat handshake detection through the synchronization channel; when the primary wireless controller fails, the standby wireless controller detects When the heartbeat is interrupted, the standby wireless controller switches to the primary wireless controller to keep the service uninterrupted; Or the primary wireless controller periodically detects whether the uplink is abnormal; if the uplink is abnormal, the primary wireless controller notifies the standby wireless controller to switch to the primary wireless controller, and maintains the service. Interrupted. Preferably, before the step of synchronizing the key service data to the standby wireless controller by using the synchronization channel established in advance with the standby wireless controller, the primary wireless controller further includes: the primary wireless controller and the standby wireless The controller negotiates the active/standby relationship according to the VRRP, and the primary wireless controller acquires the address information of the standby wireless controller, and establishes a synchronization channel with the standby wireless controller. Preferably, the method further includes: the primary wireless controller periodically attempts to establish a synchronization channel according to a preset time interval when the standby wireless controller is not activated.

The embodiment of the present invention further provides a wireless controller disaster tolerance system, including: a primary wireless controller and a standby wireless controller; wherein: the primary wireless controller is configured to establish with the standby wireless controller in advance Synchronizing channel, synchronizing key service data to the standby wireless controller; the standby wireless controller is configured to construct other required related service data according to the received key service data; And the standby wireless controller is further configured to detect, by the link detection mechanism, whether the primary wireless controller side is abnormal, and if so, the standby wireless controller switches to the primary wireless controller to keep the service uninterrupted. Preferably, the active wireless controller is further configured to batch synchronize all cached key service data within a predetermined time when the system load is lightest; and synchronize the newly generated small batch key service data in real time. Preferably, the active wireless controller is further configured to adjust the transmission rate according to the load level of the current system in the process of synchronizing data. Preferably, the standby wireless controller is further configured to perform a heartbeat handshake detection with the primary wireless controller through the synchronization channel; when the primary wireless controller fails, the standby wireless controller detects a heartbeat interruption Switch to the primary wireless controller to keep the service uninterrupted; Alternatively, the primary wireless controller is further configured to periodically detect whether the uplink is abnormal. If the uplink is abnormal, the standby wireless controller is notified to switch to the primary wireless controller, and the service is not interrupted. Preferably, the active wireless controller is further configured to negotiate a master-slave relationship with the standby wireless controller according to the VRRP, and obtain address information of the standby wireless controller, and establish a synchronization channel with the standby wireless controller. Preferably, the primary wireless controller is further configured to periodically attempt to establish a synchronization channel according to a preset time interval when the standby wireless controller is not activated.

A wireless controller disaster tolerance method and system according to an embodiment of the present invention, the primary wireless controller synchronizes key service data to the standby wireless controller through a synchronization channel established in advance with the standby wireless controller; The received key service data constructs other required related service data; then the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through the link detection mechanism, and if so, the standby wireless controller switches to The main wireless controller keeps the service uninterrupted, thereby overcoming the problems and defects of the unreliable switching between the active and standby wireless controllers and the inefficient data synchronization in the prior art, thereby reducing the impact of the AP and obtaining the main The use of the wireless controller does not affect the efficient and reliable synchronization of the data in the processing service, avoids the reconfiguration operation on the standby wireless controller, reduces the possibility of errors, saves labor costs, ensures that the wireless service does not interrupt, and improves System reliability. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of a conventional wireless network networking; FIG. 2 is a schematic structural diagram of AP dual-link disaster tolerance in the prior art; FIG. 3 is a schematic diagram of a wireless controller disaster tolerance method according to an embodiment of the present invention; 4 is a schematic diagram of a wireless network networking structure according to an embodiment of the present invention; FIG. 5 is a schematic flowchart of another embodiment of a wireless controller disaster tolerance method according to an embodiment of the present invention; A schematic diagram of the structure of an embodiment of a wireless controller disaster tolerance system. In order to make the technical solutions of the present invention clearer and clearer, the following will be further described in detail with reference to the accompanying drawings. The solution of the embodiment of the present invention is mainly: negotiating the active/standby relationship between the primary and secondary wireless controllers, establishing a synchronization channel with the standby wireless controller, and synchronizing the key service data to the standby wireless controller through the synchronization channel; The device constructs other required related service data according to the received key service data; then the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through the link detection mechanism, and if so, the standby wireless controller Switching to the main-purpose wireless controller to keep the service uninterrupted, thereby overcoming the problems and defects of the unreliable switching between the active and standby wireless controllers and the inefficient data synchronization in the prior art, thereby reducing the impact of the AP and avoiding The operation of reconfiguring on the standby wireless controller saves labor costs, ensures that wireless services are not interrupted, and improves system reliability.

As shown in FIG. 3, an embodiment of the present invention provides a method for disaster recovery of a wireless controller, including: Step S101: A primary wireless controller synchronizes key service data to a synchronization channel through a synchronization channel established in advance with a standby wireless controller. The configuration of the wireless network in the method of the embodiment of the present invention is as shown in FIG. 4, in which the primary AC (active wireless controller) and the standby AC (standby wireless control) are used. The switch is connected to multiple APs through the switch. The AP communicates with the wireless user wirelessly to provide wireless services. In addition, the active AC and the standby AC are connected through heartbeats to implement heartbeat handshake interaction. Wherein, a dedicated synchronization channel is pre-established between the active wireless controller and the standby wireless controller, and a primary standby relationship is negotiated, and the primary wireless controller synchronizes key service data to the standby wireless controller through the synchronization channel. In the process of synchronizing data, the active wireless controller adjusts the transmission rate according to the current system load level, and quickly completes data synchronization to ensure the reliability of disaster recovery. In addition, for newly generated business data, the amount of business data is smaller than the threshold, and the time-distributed small-volume key business data can be sent in real time; for the cached large-volume key business data, the system load is the lightest. Batch delivery (for example, in the early hours of the morning) to further ensure the consistency of data in the active and standby wireless controllers. The above key service data includes AP information and STA information. The wireless controller manages the AP configuration information, the AP information, the STA (Station) information, the CAPWAP protocol related data, the network processor related data, and the like, and the embodiment of the present invention considers that the primary wireless controller manages a large number of AP and STA information, the amount of business data is very large, if these data are synchronized to The backup wireless controller is not only inefficient, but may also cause data inconsistency in the primary and secondary wireless controllers due to improper processing, and is more likely to cause the primary wireless controller to affect the processing of the wireless service due to synchronization of a large amount of data. Therefore, when the primary wireless controller synchronizes the service data, only key data such as AP information and STA information are transmitted to ensure data synchronization efficiency. Step S102, the standby wireless controller constructs other required related service data according to the received key service data; and the standby wireless controller receives the key service data sent by the active wireless controller and caches the data. At the same time, the standby wireless controller reconstructs other required information according to the received AP information and STA information, so as to improve synchronization efficiency and ensure data consistency in the primary and secondary wireless controllers. Specifically, the standby wireless controller reconstructs the cached key service data according to the AP information and

The STA information constructs all data required for wireless services such as AP configuration information, network processor related data, and CAPWAP protocol related data. Therefore, the same AP configuration only needs to be configured once in the primary wireless controller, avoiding the manual configuration of the standby wireless controller, thereby reducing the possibility of human error and ensuring the wireless service required in the primary and secondary wireless controllers. The business data is consistent, which improves the reliability of disaster recovery. Step S103, the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through a link detection mechanism, and if yes, the standby wireless controller switches to a primary wireless controller. , keep the business uninterrupted. The following two methods are used to detect whether the primary wireless controller side is abnormal through the link detection mechanism: As a detection mode: the primary wireless controller and the standby wireless controller perform heartbeat handshake detection through the established synchronization channel, when When the primary wireless controller fails, the standby wireless controller detects a heartbeat interruption and determines that the primary wireless controller is faulty. Therefore, the standby wireless controller switches to the primary wireless controller in time to maintain the service. Interrupt; As another detection method: The primary wireless controller periodically detects whether its uplink is abnormal; if the uplink is abnormal, the primary wireless controller notifies the standby wireless controller to switch to the primary wireless controller, and the same Keep your business uninterrupted. Through the above solution, the embodiment of the present invention reduces the impact of the AP, and obtains the effect that the active wireless controller does not affect the processing data, and the synchronization data is efficient and reliable, and avoids reconfiguration on the standby wireless controller. The operation reduces the possibility of errors, saves labor costs, ensures that wireless services are not interrupted, and improves system reliability.

As shown in FIG. 5, another embodiment of the present invention provides a wireless controller disaster tolerance method. Before the foregoing step S101, the method further includes: Step S100, the primary wireless controller and the standby wireless control. The device negotiates the active/standby relationship according to the VRRP, and the primary wireless controller acquires the address information of the standby wireless controller, and establishes a synchronization channel with the standby wireless controller. The difference between the embodiment of the present invention and the foregoing embodiment is that the embodiment of the present invention further includes a scheme for establishing a synchronization channel between the active wireless controller and the standby wireless controller. Specifically, the address information of other wireless controllers is pre-configured in the wireless controller, and according to VRRP

(Virtual Router Redundancy Protocol) Negotiates the active/standby relationship. The active wireless controller acquires the address information of the standby wireless controller according to the configuration information, and establishes a synchronization channel with the standby wireless controller. If the synchronization channel is successfully established, the primary wireless controller synchronizes the key service data to the standby wireless control through the synchronization channel. If the synchronization channel is not successfully established, the active wireless controller periodically attempts to establish a synchronization channel with the standby wireless controller according to the preset time interval when the standby wireless controller is not activated.

In the embodiment of the present invention, the primary wireless controller establishes a synchronization channel with the standby wireless controller, and synchronizes the key service data to the standby wireless controller through the synchronization channel; the standby wireless controller constructs other information according to the received key service data. Relevant service data required; then the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through the link detection mechanism, and if so, the standby wireless controller switches to the primary wireless controller to maintain the service Uninterrupted, thereby overcoming the problems and defects of the unreliable switching between the active and standby wireless controllers and the inefficient data synchronization in the prior art, reducing the impact of the AP, and obtaining the active wireless controller does not affect the processing service. In this case, the synchronous data is efficient and reliable, avoids the reconfiguration operation on the standby wireless controller, reduces the possibility of errors, saves labor costs, ensures that the wireless service is not interrupted, and improves the reliability of the system.

As shown in FIG. 6, an embodiment of the present invention provides a wireless controller disaster tolerance system, including: a primary wireless controller 201 and a standby wireless controller 202; The primary wireless controller 201 is configured to synchronize key service data to the standby wireless controller 202 by using a synchronization channel established in advance with the standby wireless controller 202; the standby wireless controller 202 is configured to Constructing other required related service data according to the received key service data; the primary wireless controller 201 and the standby wireless controller 202 are further configured to detect the primary wireless controller by using a link detection mechanism Whether the 201 side is abnormal, and if so, the standby wireless controller 202 switches to the main wireless controller 201 to keep the service uninterrupted. The structure of the wireless network networking disaster tolerance involved in the method of the embodiment of the present invention is as shown in FIG. 4, in which the primary AC (the primary wireless controller 201) and the standby AC (the standby wireless controller 202) pass. The switch is connected to multiple APs. The AP communicates with the wireless users wirelessly to provide wireless services. In addition, the active AC and the standby AC are connected through heartbeats to implement heartbeat handshake. A dedicated synchronization channel is pre-established between the active wireless controller 201 and the standby wireless controller 202, and a primary standby relationship is negotiated. The primary wireless controller 201 synchronizes key service data to the standby wireless controller through the synchronization channel. 202. In the process of synchronizing data, the active wireless controller 201 adjusts the transmission rate according to the load level of the current system, and quickly completes data synchronization to ensure the reliability of disaster tolerance. In addition, for newly generated small business volume data with small amount of business data and time dispersion, it can be sent in real time; for cached large quantities of key business data, within the scheduled time when the system load is the lightest (such as in daily In the morning, send in batches to further ensure the consistency of data in the active and standby wireless controllers. The above key service data includes AP information and STA information. The wireless controller manages the AP configuration information, the AP information, the STA information, the CAPWAP protocol related data, the network processor related data, and the like. The embodiment of the present invention considers that the primary wireless controller 201 manages a large number of AP and STA information. The amount of service data is very large. If the data is synchronized to the standby wireless controller 202, not only is it inefficient, but also the data in the primary and secondary wireless controllers 202 is inconsistent due to improper processing, and the primary wireless controller 201 is more likely to be Synchronize large amounts of data and affect the processing of wireless services. Therefore, when synchronizing service data, the active wireless controller 201 transmits only key data such as AP information and STA information to ensure data synchronization efficiency. The backup wireless controller 202 receives the key service data transmitted by the primary wireless controller 201 and caches it. At the same time, the standby wireless controller 202 reconstructs other required information according to the received AP information and the STA information, so as to improve the synchronization efficiency and ensure the consistency of the data in the primary standby wireless controller 202. Specifically, the backup wireless controller 202 reconstructs the cached key service data, and constructs all data required for the wireless service such as the AP configuration information, the network processor related data, and the CAPWAP protocol related data according to the AP information and the STA information. Therefore, the same AP configuration only needs to be configured once in the primary wireless controller 201, thereby avoiding the manual configuration operation of the standby wireless controller 202, thereby reducing the possibility of human error, and ensuring wireless in the primary standby wireless controller 202. The business data required by the business is consistent, which improves the reliability of disaster recovery. Thereafter, the primary wireless controller 201 and the backup wireless controller 202 detect whether the primary wireless controller 201 is abnormal by the link detection mechanism, and if so, the standby wireless controller 202 switches to the primary use. The wireless controller 201 keeps the service uninterrupted. The following two ways are used to detect whether the primary wireless controller 201 is abnormal by the link detection mechanism: As a detection mode: the primary wireless controller 201 and the standby wireless controller 202 perform a heartbeat handshake through the established synchronization channel. Detecting, when the primary wireless controller 201 fails, the standby wireless controller 202 detects a heartbeat interruption, and determines that the primary wireless controller 201 is faulty. Therefore, the standby wireless controller 202 switches to the primary use in time. The wireless controller 201 keeps the service uninterrupted; as another detection mode: the primary wireless controller 201 periodically detects whether its uplink is abnormal; if the uplink is abnormal, the primary wireless controller 201 notifies the standby wireless controller 202 switches to the primary wireless controller 201, and the service can be kept uninterrupted as well. Through the foregoing solution, the embodiment of the present invention reduces the impact of the AP, and obtains the effect that the active wireless controller 201 does not affect the processing data, and the synchronization data is efficient and reliable, and the operation of reconfiguring on the standby wireless controller 202 is avoided. , reducing the possibility of errors, saving labor costs, ensuring that wireless services are not interrupted, and improving system reliability.

Further, the active wireless controller 201 is further configured to negotiate a master-slave relationship with the standby wireless controller 202 according to the VRRP, and obtain address information of the standby wireless controller 202, and establish a synchronization channel with the standby wireless controller 202. Specifically, address information of other wireless controllers is pre-configured in the wireless controller, and the active/standby relationship is negotiated according to the VRRP. The active wireless controller 201 acquires the address information of the standby wireless controller 202 according to the configuration information, and establishes a synchronization channel with the standby wireless controller 202. If the synchronization channel is successfully established, the primary wireless controller 201 synchronizes the key service data through the synchronization channel. To the standby wireless controller 202; if the synchronization channel is not successfully established, the primary wireless controller 201 periodically attempts to establish synchronization with the standby wireless controller 202 according to a preset time interval when the standby wireless controller 202 is not activated. aisle.

It should be noted that, as a specific application manner, corresponding functional modules, such as a synchronization module, a sending module, a receiving module, and a reconfiguration module, may be set in the active wireless controller 201 and the standby wireless controller 202 as needed. The control module, the disaster tolerance module, and the like, wherein: the synchronization module is configured to determine a master/slave relationship of the wireless controller, and if the negotiation determines the master wireless controller 201, obtain the address information of the standby wireless controller 202 according to the configuration information, and establish a synchronization. Channels; In a specific application scenario, the synchronization module is further configured to periodically attempt to establish a synchronization channel with the standby wireless controller 202 at the preset interval on the primary wireless controller 201 when the standby wireless controller 202 is not activated. The sending module is configured to send the key service data buffered by the primary wireless controller 201 to the standby wireless controller 202 through a synchronization channel established by the synchronization module. The receiving module is configured to receive the service data sent by the sending module through the synchronization channel established by the synchronization module, and cache the data. The reconstruction module is configured to reconstruct the service data buffered by the receiving module, and construct the data according to the AP information.

AP configuration information, AP configuration information can be configured only once in the primary wireless controller 201, reducing the possibility of multiple manual configuration errors; constructing CAPWAP protocol and network processor and other related service data according to AP and STA information, ensuring The consistency of data in the primary and backup wireless controllers 202 improves the reliability of disaster recovery. The control module is configured to control the sending module to adjust the sending rate of the sending module according to the burden degree of the system of the main wireless controller 201, the system burden is light, the sending rate is fast, the system burden is heavy, the sending rate is slow, and the main wireless controller 201 is not affected. Normal business. In a specific application scenario, the control module is further configured to control the time of synchronizing the service data, and the data of the newly registered AP and the STA is synchronized in real time. To improve the reliability of the disaster recovery, the data in the active and standby wireless controllers are ensured. The same is true. When the system is the lightest in the morning, the notification sending module synchronizes all the cached key service data and performs batch synchronization to further ensure the reliability of the disaster recovery. The disaster tolerance module is configured to detect whether the primary wireless controller 201 is faulty, and perform active/standby switching. On the one hand, the primary and secondary wireless controllers 202 perform heartbeat handshake detection through the synchronization channel established by the synchronization module. When the backup wireless controller 202 detects that the primary wireless controller 201 is interrupted, it switches to the primary wireless controller 201 and continues to maintain the wireless service. On the other hand, the active wireless controller 201 periodically detects whether the uplink is normal. If the active/standby switchover is performed in an abnormal manner, the new active wireless controller 201 continues to maintain the wireless service uninterrupted. INDUSTRIAL APPLICABILITY The wireless controller disaster tolerance method and system according to the embodiment of the present invention, the primary wireless controller synchronizes key service data to the standby wireless controller through a synchronization channel established in advance with the standby wireless controller; The key business data constructs other required related service data; then the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through the link detection mechanism, and if so, the standby wireless controller switches to the primary With the wireless controller, the service is not interrupted, thereby overcoming the problems and defects of the unreliable switching between the active and standby wireless controllers and the inefficient data synchronization in the prior art, thereby reducing the impact of the AP and achieving the main use. The wireless controller does not affect the efficient and reliable synchronization data in the processing service situation, avoids the reconfiguration operation on the standby wireless controller, reduces the possibility of errors, saves labor costs, ensures that the wireless service does not interrupt, and improves the system. Reliability.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural or process changes made by the present specification and drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claims, a wireless controller disaster tolerance method, including:

The active wireless controller synchronizes key service data to the standby wireless controller through a synchronization channel established in advance with the standby wireless controller;

The standby wireless controller constructs other required related service data according to the received key service data;

The primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through a link detection mechanism, and if yes, the standby wireless controller switches to the primary wireless controller to maintain the service. Not interrupted. The method according to claim 1, wherein the step of synchronizing the key service data to the standby wireless controller by the active wireless controller comprises:

The primary wireless controller synchronizes all cached key service data in batches within a predetermined time of system load; and/or,

Synchronize newly generated small batches of key business data in real time. The method according to claim 2, further comprising: the primary wireless controller adjusting the transmission rate according to the load level of the current system in the process of synchronizing data. The method according to claim 1, wherein the key service data includes at least wireless access point AP information and STA (Station) information. The method according to claim 1, wherein the primary wireless controller and the standby wireless controller detect whether the primary wireless controller side is abnormal through a link detection mechanism, and if so, The standby wireless controller switches to the primary wireless controller, and the steps of keeping the service uninterrupted include:

The primary wireless controller and the standby wireless controller perform heartbeat handshake detection through the synchronization channel; when the primary wireless controller fails, the standby wireless controller detects a heartbeat interruption, and the standby wireless control Switch to the main wireless controller to keep the service uninterrupted; Or the primary wireless controller periodically detects whether the uplink is abnormal; if the uplink is abnormal, the primary wireless controller notifies the standby wireless controller to switch to the primary wireless controller, and maintains the service. Interrupted. The method according to any one of claims 1 to 5, wherein the primary wireless controller synchronizes key service data to the standby wireless controller through a synchronization channel established in advance with the standby wireless controller. The steps also include:

The active wireless controller and the standby wireless controller negotiate an active/standby relationship according to the virtual routing redundancy protocol VRRP, and the primary wireless controller acquires the address information of the standby wireless controller, and establishes a synchronization channel with the standby wireless controller. The method according to claim 6, further comprising: the primary wireless controller periodically attempting to establish a synchronization channel according to a preset time interval when the standby wireless controller is not activated. a wireless controller disaster tolerance system, comprising: an active wireless controller and a standby wireless controller; wherein: the primary wireless controller is configured to pass a synchronization channel established in advance with the standby wireless controller, Key business data is synchronized to the standby wireless controller;

The standby wireless controller is configured to construct other required related service data according to the received key service data;

The primary wireless controller and the standby wireless controller are further configured to detect, by using a link detection mechanism, whether the primary wireless controller side is abnormal, and if yes, the standby wireless controller switches to a primary wireless controller. , keep the business uninterrupted. The system according to claim 8, wherein the active wireless controller is further configured to batch synchronize all cached key service data within a predetermined time when the system load is lightest; and/or,

Synchronize newly generated small batches of key business data in real time. 0. The system according to claim 9, wherein

The primary wireless controller is further configured to adjust the transmission rate according to the load level of the current system during the process of synchronizing data. The system according to claim 8, wherein The standby wireless controller is further configured to perform heartbeat handshake detection with the primary wireless controller through the synchronization channel; when the primary wireless controller fails, the standby wireless controller detects a heartbeat interruption, and switches to The main wireless controller keeps the business uninterrupted;

Alternatively, the primary wireless controller is further configured to periodically detect whether the uplink is abnormal. If the uplink is abnormal, the standby wireless controller is notified to switch to the primary wireless controller to keep the service uninterrupted. The system according to any one of claims 8-11, wherein the primary wireless controller is further configured to negotiate a master-slave relationship with the standby wireless controller according to the VRRP, and acquire address information of the standby wireless controller. , establish a synchronization channel with the standby wireless controller. The system of claim 12, wherein the primary wireless controller is further configured to periodically attempt to establish a synchronization channel according to a preset time interval when the backup wireless controller is not activated.