WO2017181778A1

WO2017181778A1 - Method and apparatus for extending link between master controls of dual-master-control device

Info

Publication number: WO2017181778A1
Application number: PCT/CN2017/075763
Authority: WO
Inventors: 郭宇
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-21
Filing date: 2017-03-06
Publication date: 2017-10-26
Also published as: CN107306235A

Abstract

Disclosed are a method and apparatus for extending a link between master controls of a dual-master-control device. The dual-master-control device comprises a primary master control, a standby master control and a line card. The method comprises: during the use of a direct connection link between a primary master control and a standby master control to perform data synchronization, choosing one line card as a proxy switching line card for data synchronization; detecting the direct connection link between the primary master control and the standby master control; and when the direct connection link is detected to be abnormal, disabling the direct connection link, and by means of the proxy switching line card, realizing data synchronization between the primary master control and the standby master control.

Description

Link expansion method and device between main control devices of dual main control devices

Technical field

The present application relates to, but is not limited to, the field of communications, and more particularly to a method and apparatus for link extension between dual master devices.

Background technique

For a dual-master device that uses a centralized management architecture in the communication field, the main control board functions as a hub. The modules involved include multiple management cores, service planes, and control planes. The master master is the master currently working, and the standby master is the master used to back up the current module information. For devices that require hot backup, each module of the standby master requires real-time "mastery" of the information of the corresponding module working in the active master, that is, data synchronization between the dual masters. This data may come from peripherals (such as hard drives, flash (Flash), SD (Secure Digital Memory Card), etc.) or from memory/cache. Once the main control is abnormal and the active/standby switchover is triggered, the standby master immediately transitions to the active master, and each module starts working according to the data that was previously synchronized. If the hot backup data is not complete at this time, it affects the stable operation of the device service. Therefore, the accuracy and real-time nature of data synchronization between dual masters is critical.

At present, in the field of communication, the two main control devices, each equipment supplier mostly uses two direct-connected high-speed buses to complete the communication between the dual masters. In practice, it is found that the two communication links, whether in active/standby mode or load sharing mode, may still have a certain degree of link anomaly, and the number of ports controlled by the master switching chip cannot be more straight. Connected to the link. Even with the further reduction of hardware costs and the increase in the number of switch chip ports, more direct links can be added to the new devices. However, how to ensure the accuracy and real-time performance of data synchronization between the dual masters of the old devices is still The main problem currently facing.

Summary of invention

The following is an overview of the topics detailed in this document. This summary is not intended to limit the claims The scope of protection.

According to the method and device for link extension between the main control devices of the dual master device provided by the embodiment of the present invention, the accuracy and real-time performance of data synchronization between the dual master devices of the old device can be improved.

According to the embodiment of the present invention, the method for extending the link between the main control devices of the dual-master device includes the main control, the standby main control, and the line card, and the method includes:

During data synchronization using the direct link between the primary master and the standby master, a line card is selected as a proxy exchange line card for data synchronization;

Detecting a direct link between the primary master and the standby master;

When it is detected that an abnormality occurs in the direct link, the direct link is disabled, and the data exchange between the primary master and the standby master is implemented by the proxy switching line card.

In an embodiment, the step of selecting a line card as a proxy exchange line card for data synchronization includes:

Sorting the service configuration quantity of the line card of the dual-master device to determine a line card with the least amount of service configuration;

The line card with the smallest determined service configuration is used as the proxy exchange line card.

In an embodiment, the step of disabling the direct link includes:

Disabling the switch chip port of the active master directly connected to the standby master;

The switch chip port of the standby master directly connected to the active master is disabled.

In an embodiment, the step of implementing data synchronization between the primary master and the standby master by using the proxy switch line card includes:

The port connected to the primary master by the proxy switch line card receives synchronization data from the active master, and the port connected to the standby master by the proxy switch line card will synchronize the data. Forward to the alternate master.

In an embodiment, the method further includes:

Detecting, by the proxy exchange line card, a communication link for implementing data synchronization between the primary master and the standby master;

When an abnormality is detected in the communication link, another line card is selected as a new proxy exchange. a line card to enable data synchronization between the primary master and the standby master via the new proxy switch line card.

In an embodiment, the method further includes:

When the direct link is detected to be normal, the direct link is enabled to implement data synchronization between the primary master and the standby master.

A storage medium according to an embodiment of the present invention stores a program for implementing a link extension method between the dual master device masters.

According to an embodiment of the present invention, a link extension device between two main control devices is provided, and the dual master device includes an active main control, a standby main control, and a line card, and the device includes:

a proxy selection module, configured to select a line card as a proxy exchange line card for data synchronization during data synchronization using a direct link between the primary master and the standby master;

a link detection module, configured to detect a direct link between the primary master and the standby master;

a data synchronization module, configured to disable the direct link when the link detection module detects that the direct link is abnormal, and exchange the line card through the proxy to implement the primary master and Data synchronization between the alternate masters.

In an embodiment, the proxy selection module is configured to sort the service configuration quantity of the line card of the dual master device, determine a line card with the least amount of service configuration, and minimize the determined service configuration amount. The card acts as a proxy exchange line card.

In an embodiment, the link detecting module is further configured to: perform, by using the proxy switch line card, a communication link for implementing data synchronization between the active master and the standby master The agent selection module is further configured to: when the link detection module detects that the communication link is abnormal, select another line card as a new proxy exchange line card, so that the data synchronization module passes the The new proxy exchange line card implements data synchronization between the active master and the standby master.

In an embodiment, the data synchronization module is further configured to: when the link detection module detects that the direct link is normal, enable the direct link to implement the active master and the host The data synchronization between the alternate masters is described.

A computer readable storage medium according to an embodiment of the present invention stores computer executable instructions, and when the computer executable instructions are executed by a processor, the link extension method between the dual master device masters is implemented.

The technical solution provided by the embodiment of the invention has the following beneficial effects:

In the embodiment of the present invention, the link between the dual masters can be made through the link between the master control and the line card without changing the physical link between the dual master (ie, the primary master and the standby master). Effectively expanded to ensure that data synchronization between the two masters is normal.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a block diagram of a method for link extension between main control devices of a dual master device according to an embodiment of the present invention;

2 is a block diagram of a link extension device between main control devices of a dual master device according to an embodiment of the present invention;

3 is a schematic diagram of a system communication link of a dual master device according to an embodiment of the present invention;

4 is a schematic diagram of forwarding, by the line card CPU, synchronization data after an abnormality occurs in the direct link 1 of the dual master control according to the embodiment of the present invention;

FIG. 5 is a schematic diagram of forwarding synchronization data by a line card switching chip after an abnormality occurs in the direct link 1 of the dual master control according to an embodiment of the present invention;

FIG. 6 is a flowchart of an operating system of a switch chip port after an abnormality occurs in the direct link 1 of the dual master control according to the embodiment of the present invention;

FIG. 7(a) is a schematic diagram of a path of a keepalive detection packet when a communication link alarm detection point is transferred between a main control and a line card according to an embodiment of the present invention;

FIG. 7(b) is a schematic diagram of a path for supporting a three-layer communication between a main control and a line card, and a keep-alive detection message when a communication link alarm detection point is transferred according to an embodiment of the present invention;

FIG. 8 is a flowchart of a system for reporting an alarm on an active main control in the case of a new link abnormality according to an embodiment of the present invention (the MUX represents an allowable number of times that a keep-alive detection message is not received).

Detailed

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

1 is a block diagram of a method for link extension between main control devices of a dual-master device according to an embodiment of the present invention. The dual-master device includes an active main control, a standby main control, and a line card. As shown in FIG. 1 , the steps include:

Step S101: During data synchronization using the direct link between the primary master and the standby master, one line card is selected as the proxy exchange line card for data synchronization.

The service configuration quantity of the line card of the dual-master device is sorted, the line card with the smallest service configuration quantity is determined, and the line card with the determined service configuration quantity is minimized as the proxy exchange line card.

Step S102: detecting a direct link between the primary master and the standby master.

Step S103: When it is detected that an abnormality occurs in the direct link, the direct link is disabled, and the line card is exchanged by the proxy to form an extended communication link between the primary master and the standby master, thereby utilizing the extended The communication link realizes data synchronization between the primary master and the standby master.

When detecting an abnormality in the direct link, firstly, the switch chip port directly connected to the standby master is disabled, and the switch chip port of the standby master directly connected to the active master is disabled, thereby Disable the direct link. Then, the dual masters forward the synchronous data through the proxy exchange line card. For example, the active master sends the synchronous data to the proxy exchange line card through the port connected to the proxy exchange line card, and the proxy exchange line card communicates with the active owner through the port. The control-connected port receives the synchronization data from the active master and forwards the synchronized data to the standby master via its port connected to the standby master.

For a proxy switch line card, if it only supports Layer 2 communication, the proxy switch line card reports the data received by its switch chip to its Central Processing Unit (CPU), and then according to the destination MAC (Media Access Control, Media access control) address, through which the switch chip and the standby master control port forward the corresponding synchronous data to the standby master; if the proxy switch line card supports Layer 3 communication, the proxy switch line card is based on the destination IP (Internet Protocol, The Internet Protocol (IP) address processes the data received by its switching chip. If the destination IP is its own, it sends the data to its CPU. If the destination IP is the standby master, its switching chip directly connects to the port connected to the standby master. The data is forwarded to the alternate master.

Wherein, while realizing data synchronization between the primary master and the standby master by using an extended communication link formed by the proxy exchange line card, link detection is performed on the communication link, and when the communication link is detected In case of abnormality, another line card is selected as the new proxy exchange line card to realize data synchronization between the active master and the standby master through the new proxy exchange line card.

When it is detected that the direct link between the active master and the standby master is normal, the direct link is enabled by enabling the corresponding port connected to the master master and the standby master, thereby implementing the master master and Data synchronization between alternate masters.

It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. , including steps S101 to S103. The storage medium may be a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, an optical disk, or the like.

2 is a block diagram of a link extension device between main control devices of a dual-master device according to an embodiment of the present invention. The dual-master device includes an active main control, a standby main control, and a line card. As shown in FIG. 2, the device includes:

The proxy selection module 21 is arranged to select a line card as a proxy exchange line card for data synchronization during data synchronization using the direct link between the primary master and the standby master. The agent selection module 21 is configured to sort the service configuration quantity of the line card of the dual master device, determine the line card with the least service configuration amount, and use the line card with the determined service configuration quantity as the proxy exchange line card.

The link detection module 22 is configured to detect a direct link between the primary master and the standby master.

The data synchronization module 23 is configured to disable the direct link when the link detection module 22 detects that the direct link is abnormal, and exchange the line card through the proxy to implement data synchronization between the primary master and the backup master. . When the link detecting module 22 detects that an abnormality occurs in the direct link, the data synchronization module 23 first disables the switch chip port directly connected to the standby master of the master host, and uses the standby master and the master. The switch chip port of the master direct connection is disabled, thereby disabling the direct link; then, the proxy exchanges the line card to form an extended communication link between the dual masters, thereby realizing the real-time synchronization data between the dual masters. Sex and accuracy.

The link detecting module 22 detects a communication link formed by the proxy switching line card for realizing data synchronization between the primary master controller and the standby master controller, and when detecting that the communication link is abnormal, the proxy selects The module 21 selects another line card as the new agent exchange line card, so that the data synchronization module exchanges the line card through the new agent to realize data synchronization between the master main controller and the standby master controller.

When the link detection module 22 detects that the direct link is normal, the data synchronization module 23 enables the direct link to implement data synchronization between the primary master and the standby master.

3 is a schematic diagram of a system communication link of a dual-master device according to an embodiment of the present invention. As shown in FIG. 3, the dual-master device includes an active main control, a standby main control, and multiple line cards (for example, in FIG. 3 Line card 1 to line card 4), wherein the main master and the standby master are connected through the direct link 1, and the data synchronization between the dual masters is realized through the direct link 1. At the same time, each line card is connected to the standby main control through the corresponding port respectively, thereby realizing data communication between the main control and the line card, for example, the line card 2 performs data communication with the main control through the communication link 2. And communicate with the alternate master via communication link 3.

When the direct link 1 shown in Figure 3 is abnormal, the active master and the standby master cannot synchronize data through the direct link 1. In this case, the line card can be used to forward the synchronization data between the masters. 4 is a schematic diagram of forwarding synchronization data by a line card CPU after an abnormality occurs in the direct link 1 of the dual master control according to the embodiment of the present invention. As shown in FIG. 4, it is assumed that the line card 2 shown in FIG. 3 is selected as a proxy. Exchange line card. The port ge1 of the switch chip of the master master is connected with the port ge2 of the switch chip of the standby master to form a direct link 1; the port ge3 of the switch chip of the master switch and the port ge4 of the switch chip of the proxy switch line card The connection forms a link 2; the port ge7 of the switch chip of the standby master is connected to the port ge6 of the switch chip of the proxy switch line card to form a direct link 3. When the direct link 1 is abnormal, the alarm module of the active master reports an alarm message about the abnormal link of the direct link. The system disables port ge1 and port ge2 according to the alarm message, and forwards the synchronization data between the masters via link 2 and link 3.

4 assumes that the line card 2 only supports Layer 2 communication, and the synchronization data of the master controller is transmitted via the port ge3 of the switch chip. The port ge4 of the switching chip of the proxy switching line card receives the synchronization data via the link 2, and sends the synchronization data to the CPU, and then the CPU forwards the synchronization data via the port ge6, that is, sends the synchronization data to the via 3 Port ge7 of the alternate master switch chip. Alternate After receiving the synchronization data via the link 3, the port ge7 of the master switching chip sends the data to its CPU.

FIG. 5 is a schematic diagram of forwarding synchronization data by a line card switching chip after an abnormality occurs in the direct link 1 of the dual master control according to the embodiment of the present invention. As shown in FIG. 5, the line card 2 of FIG. 5 supports three layers of communication. The synchronization data of the master master is transmitted via the port ge3 of the switch chip. The port ge4 of the switching chip of the switching line card exchanges the synchronization data received via the link 2 and forwards the synchronization data directly via the port ge6, that is, the synchronization data is transmitted via the link 3 to the port ge7 of the switching chip of the standby master. After receiving the synchronization data via the link 3, the port ge7 of the standby master switching chip sends the data to its CPU.

FIG. 6 is a flowchart of an operating system of a switch chip port after an abnormality occurs in the direct link 1 of the dual master control according to the embodiment of the present invention. As shown in FIG. 6, the steps include:

Step S201: Perform timing detection on the direct link between the dual masters.

Step S202: It is determined whether the direct link between the dual masters is abnormal. If the fault is abnormal, step 205 is performed; otherwise, step S203 is performed.

Step S203: It is judged whether the direct exchange chip port (for example, port ge1 and port ge2 of FIG. 4) between the dual masters has been disabled. If it has been disabled, step S204 is performed, otherwise step S201 is performed.

Step S204: Enable the direct exchange switch chip port, and execute step S201.

Step S205: Disabling the direct exchange switch chip port, and executing step S201.

FIG. 7(a) is a schematic diagram showing the path of the keepalive detection packet when the communication link alarm detection point is transferred between the main control and the line card according to the embodiment of the present invention, as shown in FIG. 7(a). The master-master CPU sends the keep-alive probe message to the port ge4 of the switch chip of the proxy switch line card via the port ge3 of the switch chip, and the CPU of the proxy switch line card receives the keep-alive probe message sent by the switch chip. The packet is forwarded to the port ge7 of the switch chip of the standby master through the port ge6 of the switch chip, and the standby master CPU generates the keep-alive probe response of the response after receiving the keep-alive probe packet sent by the switch chip. The message is sent to the port ge6 of the switching chip of the proxy switching line card via the port ge7 of the switching chip, and the CPU of the proxy switching line card receives the keep-alive probe response message sent by the switching chip, and is sent via the port ge4 of the switching chip The message is forwarded to the main master On the port ge3 of the switch chip, the CPU of the main control host receives the keep-alive probe response message sent by the switch chip.

FIG. 7(b) is a schematic diagram showing the path of the keepalive detection packet when the communication link alarm detection point is transferred, and the path of the keepalive detection packet is transmitted between the main control and the line card according to the embodiment of the present invention, as shown in FIG. 7(b). The master-master CPU sends the keep-alive probe message to the port ge4 of the switch chip of the proxy switch line card via the port ge3 of its switch chip, and the switch chip of the proxy switch line card forwards the message to the standby via its port ge6. The port ge7 of the master switching chip receives the keep-alive probe packet sent by the switch chip after receiving the keep-alive probe packet sent by the switch chip, and generates a response keep-alive probe response packet, and sends it to the proxy switch line via the port ge7 of the switch chip. The port ge6 of the switching chip of the card, the switching chip of the proxy switching line card forwards the message to the port ge3 of the switching chip of the main control via its port ge4, and the CPU of the main controlling host receives the keep-alive sent by the switching chip. Probe response message.

FIG. 8 is a flowchart of a system for reporting an alarm on an active main control in the case of a new link abnormality according to an embodiment of the present invention. As shown in FIG. 8, the steps include:

Step S301: The active master sends a keep-alive probe message.

Step S302: Perform timing detection on the extended communication link between the dual masters (ie, the communication link between the dual masters formed by the proxy exchange line card).

Step S303: The primary master determines whether a response is received. If yes, step S304 is performed, otherwise step S305 is performed.

Step S304: Clear the counter, that is, the count value K=0, and execute step S301.

Step S305: adding 1 to the counter value to obtain a new count value.

Step S306: It is determined whether the current new count value is greater than the allowable number of times MUX of the response of the keep-alive detection message is not received. If it is greater than the MUX, step S307 is performed; otherwise, step S301 is performed.

Step S307: The main master reports a communication abnormality alarm.

For the step of selecting the proxy exchange line card, the forwarding of the synchronization data between the master control by a certain line card may affect the data communication between the original master control and the line card, so the system needs to adaptively select the agent according to the actual service situation. Switching line cards, the amount of service configuration is small, which means that the board and the main control There is less communication interaction between them. Selecting it as a proxy forwarding line card can make the interference smaller, that is, sorting according to the line card service configuration quantity, and preferentially selecting the line card with a small service configuration amount as the proxy switching line card.

Normally, the unicast communication between the main control and the line card, the main control and the main control is used. When the direct link between the main control and the main control is detected abnormally, the main control and the main control are disabled at the same time as the network management alarm is triggered. The switch chip port is controlled, and the data is forwarded by the switch chip port of the master switch and the proxy switch line card, that is, the switch chip of the proxy switch line card also receives the synchronization data between the master controllers.

After the switching chip of the proxy switching line card receives the data sent by the master control, if the switching chip supports the three-layer communication, the data is forwarded to the line card CPU or another master according to the IP address, that is, if the purpose of the data The IP address is the proxy switching line card itself, and the switching chip of the proxy switching line card sends the data to the line card CPU. If the destination IP address of the data is another master, the switching chip of the proxy switching line card will The data is forwarded to the other host; if the switch chip only supports Layer 2 communication, the data is sent to the line card CPU uniformly, and then transferred by the line card CPU to another host according to the data content.

The new link between the two masters increases the communication abnormality detection alarm point. The active master and the standby master control have the interaction of the keepalive detection packets. When the link is abnormal, the active master reports the communication abnormality. The alarm is generated. At the same time, the system selects another line card as the proxy switching line card according to the order of the line card service configuration.

When the fault is recovered and the system detects that the direct link between the master and the master is restored, the master switches back to the original direct communication link.

The present application will be further described below in conjunction with the implementation of Figures 3-8.

Without loss of generality, it is assumed that the dual master device has one master master, one spare master, and four line cards. The communication link between each other is shown in Figure 3. The system configures the current service settings for all line cards. Sorting, wherein the line card 2 has the least amount of service configuration, and the link between the two masters and the line card 2 is not abnormal, so it is preferentially selected as the proxy exchange line card. The direct link between the dual masters is link 1, the link between the line card 2 and the active master is link 2, and the link between the line card 3 and the standby master is link 3.

The process of implementation is as follows:

1. The system is powered on, and the system sorts the current service configuration of all line cards. The service configuration of line card 2 is the least, and the link between the two main control and line card 2 is abnormal, so it is preferred. Exchange line cards for the agent.

2. When there is an abnormality in the direct link 1 of the dual master, as shown in Figure 4, the alarm is reported on the main control triggering alarm module, and the system disables the switching chip directly connected to the standby main control side and the standby main control. Port ge1 and the switch chip port ge2 directly connected to the active main control side and the main control unit are shown in Figure 6.

3. Taking the data sent from the active master to the standby master as an example, on the active master side, all the packets sent by the ge1 are sent by the switch chip port ge3 directly connected to the line card 2.

4. After the line card 2 and the main control host directly connected to the switch chip port ge4 receive the message sent from the main control, if the main control and the line card use three layers of communication, without loss of generality, assume the line The IP address of the device to which the card 2 is assigned is 192.168.0.2, and the IP address of the device to which the standby master is assigned is 192.168.0.14. When the destination ip of the received packet is 192.168.0.2, the packet is sent to the CPU of the local device. If the destination IP address of the received packet is 192.168.0.14, the packet is forwarded to the standby master through the switch chip port ge6 directly connected to the standby master. The process is shown in Figure 5.

5. When the ge4 of the line card 2 receives the message sent from the main controller, if the main control and the line card only support the Layer 2 communication, the message will be sent to the CPU of the board for processing, and the CPU of the board is based on the CPU. The routing table forwards the packets with the destination IP address of 192.168.0.14 to the standby master through ge6. The process is shown in Figure 4.

6. When an abnormality occurs in the direct link 1 of the dual master, the alarm detection point of the communication link between the two masters is transferred to the new link, and the active master sends a keep-alive probe every few seconds. The message is forwarded to the standby master by the line card 2, and then the standby master responds to the keep-alive probe message, and then forwards to the master master through the line card 2, and the flow is as shown in Fig. 7(a) and Fig. 7(b). The curve arrow indicates that if the primary master does not receive the response of the keep-alive probe message sent by itself for several consecutive times, it determines that the new link is abnormal, and the primary master reports the communication abnormal alarm. As shown, the system then sorts all current line card service configurations, and selects the line card with the smallest service configuration except line card 2 as the proxy forwarding line card.

7. When the fault is recovered, the system detects that the direct link between the two masters is normal. The communication link between the two masters is changed to the original direct link. The system enables the active master and backup masters. Directly connected The switching chip port ge1 and the switching chip port ge2 directly connected to the active main control side of the standby main control side are shown in FIG. 6.

In summary, the embodiments of the present invention have the following technical effects:

1. In the embodiment of the present invention, the link between the master control and the line card is borrowed without additional cost, and the switch chip of the line card can be adaptively selected to “bridge” to forward the synchronization data, so that the two masters can Keep communication normal;

2. In the case of the direct link abnormality between the two masters in the embodiment of the present invention, the bottom layer module determines the real path of synchronous data transmission between the two master controls, and the upper layer application does not need to be aware.

The embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement the link extension method between the dual master device masters.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. All or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. Embodiments of the invention are not limited to any specific form of combination of hardware and software.

Although the present application has been described in detail above, the present application is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the present application. Therefore, modifications made in accordance with the principles of the present application should be understood as falling within the scope of the present application.

Industrial applicability

Claims

A method for extending a link between two master control devices, the dual master device includes an active master, a standby master, and a line card, and the method includes:

During data synchronization using the direct link between the primary master and the standby master, a line card is selected as a proxy exchange line card for data synchronization;

Detecting a direct link between the primary master and the standby master;

When it is detected that an abnormality occurs in the direct link, the direct link is disabled, and the data exchange between the primary master and the standby master is implemented by the proxy switching line card.
The method of claim 1 wherein said step of selecting a line card as a proxy exchange line card for data synchronization comprises:

Sorting the service configuration quantity of the line card of the dual-master device to determine a line card with the least amount of service configuration;

The line card with the smallest determined service configuration is used as the proxy exchange line card.
The method of claim 1 wherein said step of disabling said direct link comprises:

Disabling the switch chip port of the active master directly connected to the standby master;

The switch chip port of the standby master directly connected to the active master is disabled.
The method of claim 1, wherein the step of realizing data synchronization between the primary master and the standby master via the proxy switch line card comprises:

The port connected to the primary master by the proxy switch line card receives synchronization data from the active master, and the port connected to the standby master by the proxy switch line card will synchronize the data. Forward to the alternate master.
A method according to any one of claims 1 to 4, further comprising:

Detecting, by the proxy exchange line card, a communication link for implementing data synchronization between the primary master and the standby master;

When it is detected that an abnormality occurs in the communication link, another line card is selected as a new proxy exchange line card, so that between the active main control and the standby main control is implemented by the new proxy exchange line card Data synchronization.
A method according to any one of claims 1 to 4, further comprising:

When the direct link is detected to be normal, the direct link is enabled to implement data synchronization between the primary master and the standby master.
A link extension device between two main control device main control devices, the dual main control device includes an active main control, a standby main control, and a line card, and the device includes:

a proxy selection module, configured to select a line card as a proxy exchange line card for data synchronization during data synchronization using a direct link between the primary master and the standby master;

a link detection module, configured to detect a direct link between the primary master and the standby master;

a data synchronization module, configured to disable the direct link when the link detection module detects that the direct link is abnormal, and exchange the line card through the proxy to implement the primary master and Data synchronization between the alternate masters.
The device according to claim 7, wherein the agent selection module is configured to sort the service configuration amount of the line card of the dual master device, determine a line card with the least amount of service configuration, and determine the determined service The line card with the least amount of configuration is used as the proxy exchange line card.
The apparatus according to claim 7 or 8, wherein the link detecting module is further configured to: form, between the active main control and the standby main control, formed by the proxy exchange line card The data synchronization communication link is detected; the proxy selection module is further configured to: when the link detection module detects that the communication link is abnormal, select another line card as a new proxy exchange line card for The data synchronization module implements data synchronization between the primary master and the standby master through the new proxy switch line card.
The apparatus according to claim 7 or 8, wherein the data synchronization module is further configured to: when the link detection module detects that the direct link is normal, enable the direct link, implement the Data synchronization between the primary master and the standby master is described.