WO2012009914A1

WO2012009914A1 - Protection switching method and system

Info

Publication number: WO2012009914A1
Application number: PCT/CN2010/079022
Authority: WO
Inventors: 任文杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-21
Filing date: 2010-11-23
Publication date: 2012-01-26
Also published as: CN102340407A; CN102340407B

Abstract

The invention discloses a protection switching method and system, in order to solve the problem that the protection switching can not be achieved when the communication between a master device and a slave device is abnormal. The protection switching method includes the following steps: a master and a slave microwave node device agent center determine that one or more failures occur on the master microwave node device or the slave microwave node device according to a multi-point failure detection policy; when the communication between the master and the slave microwave node device is normal, the master and the slave microwave node device agent center perform the protection switching through a protection switching communication path; and when the communication between the master and the slave microwave node device is abnormal, the master and the slave microwave node device agent center inform the management center and the management center performs the protection switching on the master and the slave microwave node device through the protection switching communication path. With the use of the invention, the protection switching is more reliable, the occurrence of false-switching and no-switching is reduced, and the time for protection switching is reduced.

Description

Protection switching method and system

The present invention relates to the field of communications, and in particular, to a protection switching method and system. Background technique

At present, microwave communication technology has been in existence for more than half a century. This technology is a wireless communication method for information transmission in the microwave band through the ground line of sight. Microwave communication plays an important role in the field of communication and is a fast means of communication. Whether in the mobile access network or in the mobile metropolitan area network and the core network, the microwave equipment can be seen everywhere, especially in emergency communication, microwave is an irreplaceable means. Digital microwave communications, fiber optics, and satellites are collectively referred to as the three pillars of modern communications transmission.

As a single microwave device, it must be stable and reliable to support a stable and reliable microwave network. However, hardware and software have their own defects, so inevitably there will be failures. In the related technology, in order to improve the reliability of a single microwave device. Sexuality generally selects a 1+1 protection scheme: that is, one microwave node device is the primary subunit, and the other microwave node device is the standby subunit, and the primary and secondary subunits constitute a protection pair of a certain transmission direction. When the primary subunit fails, it is immediately switched to the spare subunit to ensure the normal operation of the traffic in the transmission direction.

At present, the common protection switching methods are hot backup, hot backup + space diversity, frequency diversity, hot backup + frequency diversity. Their purpose is to ensure high-reliability transmission of transmission services. Currently, microwave devices on the market generally support the above protection switching methods. Since protection switching is a dynamic process, if any problems occur during the protection switching process, the protection switching fails, and the result of the protection switching is difficult to control.

In practical applications, the method of implementing protection switching is different, and the effect of protection switching may not be possible. In the current related technology, the protection switching relies heavily on the trigger channel between the active and standby. If the channel fails, that is, the communication between the active and standby devices is abnormal, the protection switching cannot be completed. If the trigger channel fails. This switching method is completely ineffective. For example, there is a problem that the current fault is not detected, and the service is not switched, and the communication link is faulty, and the service is defective, and the fault is caused by the fault detection. Summary of the invention

The present invention provides a protection switching method and system, which solves the problem that the switching cannot be realized when the communication between the primary and secondary devices is abnormal in the prior art.

The present invention provides a protection switching method in which a proxy center is provided in an active/standby microwave node device (a primary microwave node device and a backup microwave node device) constituting a protection pair, and a management center is disposed in the protection pair. , the method includes:

The active and standby microwave node device proxy centers, that is, the primary microwave node device proxy center and the standby microwave node device proxy center, determine one or more faults of the primary microwave node device or the standby microwave node device according to the preset multipoint fault detection strategy. ;

When the communication between the active and standby microwave node devices is normal, the active and standby microwave node device proxy centers perform protection switching of the active and standby microwave node devices through the protection switching communication channel.

When the communication between the active and standby microwave node devices is abnormal, the active and standby microwave node device agent center notifies the management center. The management center performs forced protection switching on the active and standby microwave node devices through the protection switching communication channel.

The invention also provides a protection switching system, comprising:

The primary microwave node device proxy center is configured to determine that one or more faults occur in the primary microwave node device or the standby microwave node device according to the preset multi-point fault detection policy, and the communication between the active and standby microwave node devices is normal. The protection switching of the active and standby microwave node devices is performed through the protection switching communication channel;

Spare microwave node device proxy center for pre-set multi-point fault detection strategy Determining one or more faults of the primary microwave node device or the standby microwave node device, and performing protection switching of the active and standby microwave node devices through the protection switching communication channel when the communication between the active and standby microwave node devices is normal;

The management center is configured to receive the notification of the proxy center of the active and standby microwave node devices in the case of abnormal communication between the active and standby microwave node devices, and perform forced protection switching on the active and standby microwave node devices through the protection switching communication channel.

The beneficial effects of the present invention are as follows:

In the embodiment of the present invention, the multi-point detection control strategy and the protection switching triggered by each fault are used in a relatively independent and unified implementation manner, which solves the problem that the switching of the active/standby equipment in the prior art is not realized when the communication is abnormal. At the same time, the high-speed communication channel between the active and standby devices can solve the problem that the service interruption time is long due to the long switching time, and the current undetectable fault can be solved by the multi-point detection control strategy without causing traffic failure and communication link failure. The problem of protection switching caused by business failure and misdetection without switching, so that the protection switching action is completely under controllable state, making protection switching more reliable and safe, reducing the occurrence of false switching and non-reversing; and shortening protection The time of switching improves the performance of the device. DRAWINGS

1 is a schematic diagram of a management center-agent center architecture and data flow direction according to an embodiment of the present invention; FIG. 2 is a flowchart of a protection switching method according to an embodiment of the present invention;

FIG. 3 is a flowchart of a process of triggering protection switching of fault information according to an embodiment of the present invention; FIG. 4 is a flowchart of a process of triggering protection switching of a master-slave agent in an embodiment of the present invention;

FIG. 5 is a flowchart of a process for triggering protection switching of a power-down message according to an embodiment of the present invention; FIG. 6 is a flowchart of a process for triggering protection switching by a remote alarm according to an embodiment of the present invention; FIG. 7 is a protection switching system according to an embodiment of the present invention; Schematic diagram of the structure. detailed description

In order to solve the problem that the switching time of the prior art is long, the service interruption time is long, the current undetectable fault is not performed, and the service is faulty, the communication link is faulty, the service is not switched, and the service is detected. The problem of switching, the present invention provides a protection switching method and system.

Before the embodiment of the present invention is described, the network architecture of the embodiment of the present invention is first described in detail. FIG. 1 is a schematic diagram of a management center-agent center architecture and data flow direction according to an embodiment of the present invention, as shown in FIG. (Manager) - Agent Center (Agent) architecture consists of three modules: Management Center (Manager), Active Agent Center, that is, the primary microwave node device agent center (Master Agent), the standby agent center, that is, the standby microwave node device agent center (Slave Agent); six types of messages: a Manager-Agent heartbeat message, including: a heartbeat message 101 and a heartbeat message 103; a Manager-Agent control message, including: a control message 102 and a control message 104; and an Agent-Agent heartbeat message, including: The heartbeat message 105; the agent-agent control message includes: a control message 106; a remote alarm (RDI) message, including: a remote alarm 107 and a remote alarm 108.

The content of the Manager-Agent heartbeat message includes: fault information that the agent can detect, that is, the current fault state; the current working state of the agent, including: the active state and the standby state. The contents of the Manager-Agent control message include: a forced switching message sent by the Manager to the Agent; a completion forced switching end message sent by the Agent to the Manager; a request to monitor the protection switching message sent by the Agent to the Manager; and a cancellation monitoring protection switching message sent by the Agent to the Manager . The agent-agent heartbeat message includes: the fault information that the agent can detect, that is, the current fault state; the current working state of the agent, including: the active state and the standby state. The Agent-Agent control message includes: a request protection switching message sent by the Master Agent to the Slave Agent; a protection switching end message sent by the original Slave Agent to the original Master Agent. Remote alarm message: It is an extensible message, which can indicate any fault of the peer and cause the local fault. The message is that the peer end inserts the fault information into the microwave frame and feeds back to the local end.

The Manager is a control management center. Its main function is to manage the heartbeat message 101 and the heartbeat message 103 reported by the Master Agent and the Slave Agent. The information content of the two heartbeat messages mainly includes the status information and fault information of the Master Agent and the Slave Agent. There are two types of reporting: triggering reporting status information and fault information, and reporting status information and fault information at the same time during periodic reporting or interval. The triggering report refers to: When the change occurs, it will be reported automatically. The main purpose is to enable the management center to plan the correct transmission path when the fast channel fails. The periodic reporting or interval reporting at the same time mainly refers to the management center to the page. Feedback on the working status of the Master Agent and the Slave Agent, and when there is a problem with the Fast Track, the Management Center monitors it based on heartbeat messages. After receiving the heartbeat message 101 and the heartbeat message 103 of the Master Agent and the Slave Agent, the Manager returns the status of the current two agent centers (Agent) to the user interface, and does not receive the heartbeat message 101 or the heartbeat message 103 when the timeout expires. The working status of the corresponding device is displayed as not working, the fault status is set to a serious fault, and the alarm is reported; when the Manager receives the request to monitor the protection switching message from the Master Agent or the Slave Agent, the optimal planning of the transmission unit is started. The transmission path sends a mandatory switching message to the Master Agent and the Slave Agent, and then monitors the fault status of the Master Agent and the Slave Agent of the transmission unit, and ensures that the transmission unit can transmit services as normal as possible until the cancellation monitoring protection switching message is received.

Agent is an agent center. Its main function is to process the fault information detected by the detection module of the agent. The communication module of the agent communicates with another agent, and the execution module of the control agent completes the protection switching action. The Master Agent can the distal end of this fault indication (R _emo te Defect indication, referred to as RDI) message is inserted into the microwave frame, RDI message is returned to the remote end of the present failure information.

It should be noted that the Manager of the embodiment of the present invention is substantially different from the protection switching controller in the prior art. First, the protection switching controller in the prior art is the core of the protection switching. The function of the Manager to control the protection switching has been weakened in the embodiment of the present invention. That is, if the active and standby agents can communicate normally, the Manager does not participate in the protection switching process, and only monitors the heartbeat messages of the active and standby agents. The protection switching control right is acquired only when the communication between the active and standby agents is abnormal, and unified protection switching planning and control are performed. In addition, the agent in the embodiment of the present invention is no longer a simple proxy function. When the communication between the active and standby agents is normal, the agent in the active state can participate in the protection switching process.

The details of the Manager-Agent architecture and data flow in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Method embodiment

According to an embodiment of the present invention, a protection switching method is provided, which is based on the above

Manager-Agent architecture: The active and standby microwave node devices that form the protection pair are set with their own agents, and one manager is set in each protection pair. 2 is a flowchart of a protection switching method according to an embodiment of the present invention. As shown in FIG. 2, a protection switching method according to an embodiment of the present invention includes the following processing:

Step 201: The active/standby agent determines that one or more faults occur in the primary microwave node device or the standby microwave node device according to the preset multi-point fault detection policy. The multi-point fault detection policy includes at least one of the following: The heartbeat message is detected, the power-down message is detected, the fault information of the active and standby agents is detected, and the remote alarm is detected. It should be noted that the remote alarm detection is mainly used to indicate that the local end cannot detect a fault through the alarm information of the peer end, and is an alarm that can be extended.

Specifically, the active/standby agent includes a fault detection module for detecting a device fault, a communication module for communication between the master and the backup agent, and a communication between the Manager and the agent, and an execution module for completing the protection switching action and writing the remote alarm information. .

It should be noted that the active and standby agents are determined according to a preset multi-point fault detection policy. In the case that multiple faults occur in the primary microwave node device or the standby microwave node device, the priority of multiple faults needs to be determined. The priority is from high to low: power failure, active and standby microwave node device proxy center communication abnormality The fault is faulty on the active and standby microwave node devices and the remote alarm is faulty. Finally, the corresponding protection switching operation needs to be performed according to the priority of the fault.

Step 202: When the communication between the active and standby microwave node devices is normal, the active/standby agent performs protection switching of the active and standby microwave node devices through the protection switching communication channel. The protection switching communication channel includes: a high speed between the active and standby agents. A reliable communication channel between the communication channel, the active and standby Agents, and the Manager, and a remote alarm communication channel. Specifically, the communication channel between the active and standby agents should be made into a high-speed channel to ensure that the protection switching is completed quickly and the protection switching time is shortened. The communication channel between the active and standby Agents and the Manager must be made into a reliable channel to ensure high reliability of protection switching. The communication channel inserts local state information into the microwave frame. It should be noted that, when there is no fault in the high-speed communication channel, the protection switching information is transmitted through the high-speed communication channel; when the high-speed communication channel is faulty, the monitoring information sent by the agent center to the management center, and the forced switching sent by the management center to the agent center The information will use the reliable communication channel, and the heartbeat message is also transmitted through the reliable communication channel; the remote alarm communication channel is used to transmit the fault information returned by the peer end to the local end.

Step 203: In the case that the communication between the active and standby microwave node devices is abnormal, the active/standby agent notifies the Manager, and the manager performs forced protection switching on the active and standby microwave node devices through the protection switching communication channel.

It can be seen from the above that the central location of the Manager has been weakened, mainly to shorten the protection switching time. However, the reserved management function is to complete the protection switching when the communication between the active and standby agents cannot be completed. Switching reliability.

The following describes the process of performing protection switching or forced protection switching for different faults on the active and standby microwave node devices.

In case 1, the active and standby agents detect that their own device has failed. First, the detection module of the agent detects that the device is faulty, and notifies the agent that the device is faulty. In the case that the faulty device is the standby microwave node device, the standby microwave node device agent center (Slave Agent) goes to the primary microwave node device. The master agent sends a fault message, and the master agent modifies the fault state information of the standby microwave node device according to the fault status message. The fault state information is modified to check whether the protection switchover is performed during the protection switching. . In the case that the faulty device is the primary microwave node device, the MasterAgent detects the fault state information of the standby microwave node device. If the standby microwave node device has a fault, the alarm is reported. If the standby microwave node device is normal, the master and the standby agent are used. The high-speed communication channel sends a protection switching message to the slave agent, performs protection switching of the active and standby microwave node devices, and changes its working status information to the standby state. After receiving the protection switching message, the slave agent performs the primary and secondary microwaves. The protection of the node device is changed, and the working status information of the node is changed to the active state, and the protection switching completion message is sent to the original master agent. When the original MasterAgent does not receive the protection switching completion message, the original master agent notifies the manager through the reliable communication channel. Perform a forced protection switchover. Preferably, if the original MasterAgent does not receive the protection switching completion message within the specified time, the agent will retry three times. If the protection switching completion message of the slave agent has not been received at this time, the Manager is notified to take over the protection switching control. Right, the Manager completes the planning and decision-making of protection switching.

FIG. 3 is a flowchart of a process for triggering protection switching of fault information according to an embodiment of the present invention. As shown in FIG. 3, the following processing is included:

Step 301: The detection module of the agent detects that the transmission unit is faulty.

Step 302: The detecting module of the agent reports the fault information to the agent.

Step 303, the agent determines whether its working state is the main state, if the determination is no, step 304 is performed, otherwise, step 305 is performed;

Step 304: If it is in the standby state, notify the MasterAgent of the fault message, and end the operation; Step 305, if it is the main state, it is determined whether there is a fault in the standby unit, if the determination is yes, then step 306 is performed, otherwise, step 307 is performed;

Step 306: If the standby unit is faulty, report the fault of the transmission unit to the upper level, and end the operation;

Step 307: If the standby unit is not faulty, send a protection switching message to the Slave Agent, complete its own protection switching action, and change the working state to the standby state;

Step 308, the Slave Agent receives the request protection switching message.

Step 309, the Slave Agent completes the protection switching action by executing the module, and changes the working state to the active state;

In step 310, the master agent returns a protection switching end message to the original master agent. In step 311, the original master agent receives the protection switching end message, and the protection switching process ends. Case 2: The active and standby agents detect that the communication between the active and standby agents is abnormal through the heartbeat message. When the active/standby agent fails to receive the heartbeat message from the other agent or the correct message cannot be resolved, the master/slave agent cannot communicate with the active/standby agent. The Master Agent in the active state will notify the Manager to take over the protection switching control. The Manager completes the planning and decision of the protection switching through the reliable communication channel. The Master Agent sends a message to take over the protection switching control right to the Manager. The Manager receives the takeover protection switching control. The weight message is used to determine whether the active and standby microwave node devices meet the transmission service condition according to the fault state information and the working state information of the active and standby microwave node devices. When determining that the transmission service condition is met, the Manager sends a mandatory protection switching message to the active and standby agents. The protection switching between the active and standby microwave node devices is performed. When it is determined that the transmission service is not satisfied, the Manager plans the transmission path according to the fault status information, performs mandatory protection switching on the active and standby agents according to the transmission path, and receives the forced switching returned by the active and standby agents. After the message is completed, the monitoring status is entered. When the communication between the active and standby agents is restored, the Manager cancels the protection switching control and ensures that the idle switching of the protection switching is '1'. FIG. 4 is a flowchart of processing a communication interruption triggering protection switching of the active/standby agent according to the embodiment of the present invention. As shown in FIG. 4, the following processing is included:

Step 401: The communication module detects that the communication between the active and standby agents is abnormal.

Step 402: The Master Agent sends a request to the Manager to monitor the protection switching message. Step 403: After receiving the monitoring protection switching message, the Manager determines the planning according to the working status and the fault status of the active and standby agents.

Step 404, the Manager determines whether the transmission unit meets the requirements of the normal transmission service, if the determination is no, step 405 is performed, otherwise, step 408 is performed;

Step 405: Plan a path that can satisfy the transmission service and send a mandatory protection switching message to the active/standby agent.

Step 406: After the active/standby agent receives the mandatory protection switching message, the execution module completes the protection switching action.

Step 407: The active/standby agent returns a mandatory protection switching completion message to the Manager. Step 408: After receiving the mandatory protection switching completion message, the Manager enters the monitoring state to ensure normal transmission of the service. If the communication between the active and standby agents is normal, the master The agent sends a cancel monitoring protection switching message to the Manager, and the subsequent protection switching is still completed by the active and standby agents.

In the third case, the active and standby agents check the power-down message to confirm that the peer is powered off.

The agent receives the power-down message of the other party. If the master agent confirms that the standby microwave node device is powered off by detecting the power-down message, the master agent does not perform the operation. If the slave agent detects the power-down message to confirm that the primary microwave node device is powered off, the slave agent The protection switching is performed through the high-speed communication channel, and its own working status information is set as the main state.

FIG. 5 is a flowchart of a process for triggering protection switching of a power down message according to an embodiment of the present invention. As shown in FIG. 5, the following processing is included:

Step 501: An Agent detects that the other party's agent is powered off, or receives a power failure message from the other party; Step 502, the agent determines whether the working state of the agent is the active state. If the determination is yes, the operation ends; otherwise, step 503 is performed;

Step 503, the protection switching operation is completed by the execution module of the agent, and the working state is set to the active state.

Case 4: The active and standby agents detect the remote alarm.

The master agent in the active state detects the remote alarm through the remote alarm communication channel. The master agent detects whether the device is faulty according to the remote alarm. If the judgment is yes, it detects that the device has a detectable fault. The agent performs the protection switching of the active and standby microwave node devices through the high-speed communication channel, that is, enters the protection switching process triggered by the fault information; if the determination is no, the master agent detects the fault state information of the standby microwave node device; If the fault occurs, the master agent does not perform the operation. If it is determined that there is no fault in the standby microwave node device, the master agent performs protection switching through the high-speed communication channel. After the protection switching, the original slave agent detects whether there is a remote alarm through the remote alarm communication channel. If the judgment is yes, the original Master Agent reports an undetectable fault alarm. If the remote alarm information continues to be displayed, the peer device is faulty. You need to report the alarm information of the undetectable fault on the peer device.

FIG. 6 is a flowchart of a process for triggering protection switching by a remote alarm according to an embodiment of the present invention. As shown in FIG. 6, the following processing is included:

Step 601: The master agent detects that there is remote alarm information.

Step 602, the Master Agent first detects whether there is a fault, if the determination is yes, then step 603 is performed, otherwise, step 604 is performed;

Step 603: If the Master Agent is faulty, the protection switching process triggered by the fault information is entered;

Step 604, if there is no fault, it is detected whether there is fault information in the standby unit, if the determination is yes, step 605 is performed, otherwise, step 606 is performed; Police information;

Step 606: If the standby unit does not have a fault, the master agent sends a request protection switching message to the Slave Agent.

Step 607: After receiving the request for protection switching message, the Slave Agent completes the protection switching action and returns a protection switching completion message.

Step 608, it is detected whether there is still a remote alarm, if the determination is yes, then step 609 is performed, otherwise, step 605 is performed;

Step 609: When there is an undetectable fault on the local end or the opposite end receiving end, the alarm information of the undetectable fault is reported to the local sending end or the opposite end receiving end.

The above process is a relatively independent fault process that is decomposed. It is a protection switch process that is selected according to different trigger conditions. It must be processed uniformly during the process. Otherwise, repeated protection switching or no switching will occur. In the case of the situation, the above various types of faults need to be analyzed in the process flow, and various faults are classified and prioritized according to the fault association relationship, and different processing flows are selected according to different trigger conditions. For example, if there is a power failure, the primary and secondary agent communication abnormality faults and remote alarm faults will occur. If the power failure message is processed, the active and standby agent communication abnormalities and remote alarm faults will definitely occur. In this case, the priority of the power failure is greater than that of the active and standby agents, and the remote alarm is faulty. Therefore, only the power failure and the remote alarm failure are not processed. In the embodiment of the present invention, the priority of each fault is from high to low: a power failure fault, an abnormal communication between the active and standby agents, a fault of the active and standby devices, and a fault of the remote alarm.

It can be seen that the protection switching policy implementation process of the embodiment of the present invention uses a multi-point protection switching strategy to spread the risk of protection switching. When the high-reliability protection switching is satisfied, the fastness of the protection switching is improved as much as possible. Shorten the protection switching time, because it is distributed protection In the process of changing, the processing flow of each piece of information is different, but it can be managed uniformly. In addition, the embodiments of the present invention can be implemented as independent modules, which are convenient for porting to other products requiring 1+1 protection, reducing development cost and shortening development time; remote alarm information can also help locate faults of positioning equipment for future development and maintenance. Gain experience.

Device embodiment

According to an embodiment of the present invention, a protection switching system is provided. FIG. 7 is a schematic structural diagram of a protection switching system according to an embodiment of the present invention. As shown in FIG. 7, the protection switching system according to an embodiment of the present invention includes: a primary microwave. The node device agent center (MasterAgent) 70, the standby microwave node device agent center (Slave Agent) 72, and the management center (Manager) 74. The respective modules of the embodiments of the present invention are described in detail below.

Specifically, the master agent 70 is configured to determine, according to the preset multi-point fault detection policy, that one or more faults occur in the primary microwave node device or the standby microwave node device, and the communication between the active and standby microwave node devices is normal. The protection switching of the active and standby microwave node devices is performed by the protection switching communication channel. The multi-point fault detection policy includes at least one of the following: detecting a heartbeat message of the active and standby agents, detecting a power failure message, and detecting the The agent's own device fault information is detected and the remote alarm is detected. It should be noted that the remote alarm detection is mainly used to indicate that the local end cannot detect faults through the alarm information of the peer end, and is an alarm that can be extended.

The protection switching communication channel includes: a high-speed communication channel between the active and standby agents, a reliable communication channel between the active and standby Agents and the Manager, and a remote alarm communication channel. Specifically, the communication channel between the active and standby agents should be made into a high-speed channel to ensure that the protection switching is completed quickly and the protection switching time is shortened. The communication channel between the active and standby Agents and the Manager must be made into a reliable channel to ensure high reliability of protection switching. The communication channel inserts local state information into the microwave frame. It should be noted that, when the high-speed communication channel is fault-free, the protection switching information is transmitted through the high-speed communication channel; when the high-speed communication channel is faulty, the monitoring information sent by the agent center to the management center is managed. The forced switching information sent by the center to the agent center will utilize the reliable communication channel, and the heartbeat message is also transmitted through the reliable communication channel; the remote alarm communication channel is used to transmit the fault information returned by the peer end to the local end.

The Slave Agent 72 is configured to determine, according to the preset multi-point fault detection policy, that one or more faults occur in the primary microwave node device or the standby microwave node device, and the protection is performed when the communication between the active and standby microwave node devices is normal. Performing protection switching of the active and standby microwave node devices by switching the communication channel;

It should be noted that, in the case that the active/standby agent determines that multiple faults occur in the primary microwave node device or the standby microwave node device according to the preset multi-point fault detection policy, the priority of multiple faults needs to be determined, where priority From high to low: power failure, abnormal communication of the active and standby microwave node device agent center, failure of the active and standby microwave node devices, and remote alarm failure. Finally, the corresponding protection switching operation needs to be performed according to the priority of the fault.

The manager 74 is configured to perform forced protection switching on the active and standby microwave node devices by using the protection switching communication channel in the case that the communication between the active and standby microwave node devices is abnormal.

In case 1, the active/standby agent detects that its own device has failed.

First, after detecting that the device is faulty, the detection module of the agent notifies the agent that the device is faulty. In the case that the faulty device is the standby microwave node device, the standby microwave node is set. The slave agent sends a fault status message to the master agent node (Master Agent), and the master agent modifies the fault state information of the standby microwave node device according to the fault status message. It should be noted that the fault state information is modified. In order to perform a query during protection switching, it is determined whether protection switching is performed. In the case that the faulty device is the primary microwave node device, the master agent detects the fault state information of the standby microwave node device. If the standby microwave node device has a fault, the alarm is reported. If the standby microwave node device is normal, the master and the standby device are configured. The high-speed communication channel between the agents sends a protection switching message to the slave agent, and performs protection switching of the active and standby microwave node devices, and changes the working status information of the device to the standby state. After receiving the protection switching message, the slave agent performs the primary and backup operations. The protection of the microwave node device is changed, and the working status information of the device is changed to the active state, and the protection switching completion message is sent to the original master agent. When the original master agent does not receive the protection switching completion message, the original master agent passes the reliable communication channel. Notify the Manager to perform forced protection switching. Preferably, if the original master agent does not receive the protection switching completion message within the specified time, the agent will retry three times. If the protection switching completion message of the slave agent has not been received at this time, the Manager is notified to take over the protection switching. Control, the Manager completes the planning and decision making of protection switching.

Case 2: The active and standby agents detect that the communication between the active and standby agents is abnormal through the heartbeat message. When the active/standby agent fails to receive the heartbeat message from the other agent or the correct message cannot be resolved, the master/slave agent cannot communicate with the active/standby agent. The Master Agent in the active state will notify the Manager to take over the protection switching control. The Manager completes the planning and decision of the protection switching through the reliable communication channel. The Master Agent sends a message to take over the protection switching control right to the Manager. The Manager receives the takeover protection switching control. The weight message is used to determine whether the active and standby microwave node devices meet the transmission service condition according to the fault state information and the working state information of the active and standby microwave node devices. When determining that the transmission service condition is met, the Manager sends a mandatory protection switching message to the active and standby agents. , for the main and standby microwave section The protection switching of the point device is performed. When it is determined that the transmission service is not satisfied, the Manager plans a transmission path according to the fault status information, performs a mandatory protection switching on the active and standby agents according to the transmission path, and receives a forced switching completion message returned by the active and standby agents, and enters Monitoring status; When the communication between the active and standby agents is restored, the Manager cancels the protection switching control and ensures the fast switching protection.

The agent receives the power-down message from the other party. If the master agent confirms that the standby microwave node device is powered off by detecting the power-down message, the master agent does not perform the operation. If the slave agent detects the power-down message to confirm that the primary microwave node device is powered off, the slave agentt The protection switching is performed through the high-speed communication channel, and its own working status information is set as the main state.

Case 4: The active and standby agents detect the remote alarm.

The above process is a relatively independent fault process that is decomposed. It is a protection switch process that is selected according to different trigger conditions. It must be processed uniformly during the process. Otherwise, repeated protection switching or no switching will occur. The situation needs to be handled In the process, the above various types of faults are analyzed, and various types of faults are classified and prioritized according to the relationship of faults, and different processing flows are selected according to different triggering conditions. For example, if there is a power failure, the primary and secondary agent communication abnormality faults and remote alarm faults will occur. If the power failure message is processed, the active and standby agent communication abnormalities and remote alarm faults will definitely occur. In this case, the priority of the power failure is greater than that of the active and standby agents, and the remote alarm is faulty. Therefore, only the power failure and the remote alarm failure are not processed. In the embodiment of the present invention, the priority of each fault is from high to low: a power failure fault, an abnormal communication between the active and standby agents, an active/standby device fault, and a remote alarm fault.

In summary, the embodiment of the present invention solves the problem of long-distance interruption of the service caused by the long switching time in the prior art by the distributed detection control strategy and the relatively independent and unified implementation of the protection switching triggered by each fault. If the fault is not detected, the fault is caused by the fault of the service link, the fault of the communication link, the fault of the communication link, and the fault detection caused by the fault detection. The protection switching action is completely under the controllable state, so that the protection is performed. The switching is more reliable and safe, reducing the occurrence of false switching and non-reversing; and shortening the time of protection switching and improving the performance of the equipment.

In addition, the embodiments of the present invention can be implemented as independent modules, which are convenient for porting to other products requiring 1+1 protection, reducing development cost and shortening development time; remote alarm information can also help locate faults of positioning equipment for future development and maintenance. Gain experience.

While the preferred embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.

Claims

Claim

A protection switching method, characterized in that: a primary proxy center is provided in an active/standby microwave node device constituting a protection pair, and a protection center is provided in the protection center, the method includes:

The active/standby microwave node device proxy center determines one or more faults of the primary microwave node device or the standby microwave node device according to the preset multi-point fault detection policy;

In the case that the communication between the active and standby microwave node devices is normal, the active/standby microwave node device proxy center performs the protection switching of the active and standby microwave node devices through the protection switching communication channel; If the communication is abnormal, the active/standby microwave node device proxy center notifies the management center, and the management center performs a forced protection switching on the active and standby microwave node devices through the protection switching communication channel.

The method according to claim 1, wherein the multi-point fault detection policy comprises at least one of: detecting a heartbeat message of the active and standby microwave node device proxy center, and detecting a power down message Detecting the fault information of the active and standby microwave node device proxy center and detecting the remote alarm.

The method of claim 2, wherein the protection switching communication channel comprises: a high-speed communication channel between the active and standby microwave node device proxy centers, and an active/standby microwave node device proxy center and A reliable communication channel between the management centers and a remote alarm communication channel.

The method according to claim 1, wherein in the case that the active/standby microwave node device proxy center determines that the primary microwave node device or the standby microwave node device has multiple faults according to the preset multipoint fault detection policy The method further includes:

The priority of the multiple faults is determined, where the priority is from high to low: power failure fault, abnormal communication of the active and standby microwave node device proxy center, fault of the active and standby microwave node equipment, The remote alarm is faulty, and the corresponding protection switching operation is performed according to the priority of the fault.

The method according to any one of claims 3 to 4, wherein, in the case that the active/standby microwave node device proxy center detects that the own device is faulty, the active and standby microwave node device proxy center passes The high-speed communication channel performs protection switching between the active and standby microwave node devices.

The method according to claim 5, wherein the active/standby microwave node device proxy center performs protection switching of the active and standby microwave node devices through the high-speed communication channel, including:

In the case that the faulty device is the standby microwave node device, the standby microwave node device proxy center sends a fault message to the active microwave node device proxy center, and the active microwave node device proxy center modifies the standby microwave node according to the fault message. The failure state information of the device; in the case that the faulty device is the primary microwave node device, the primary microwave node device proxy center detects the fault state information of the standby microwave node device, if the standby microwave node device has a fault Then, the alarm is reported. If the standby microwave node device is normal, the protection switching message is sent to the proxy node of the standby microwave node device, and the protection switching of the active and standby microwave node devices is performed, and the working status information of the active standby node is modified. For standby status;

After receiving the protection switching message, the standby microwave node device proxy center performs protection switching of the active and standby microwave node devices, and modifies its working state information to a primary state, and delegates to the original primary microwave node device. The center sends a protection switching completion message;

When the original primary microwave node device proxy center does not receive the protection switching complete message, the original primary microwave node device proxy center notifies the management center to perform a forced protection switching.

The method according to any one of claims 3 to 4, wherein, in the case that the active/standby microwave node device proxy center detects a communication abnormality in the proxy center of the active/standby microwave node device through a heartbeat message, The active and standby microwave node device agent center notifies the management center, and the management center performs a forced protection switching on the active and standby microwave node devices through the reliable communication channel.

The method according to claim 7, wherein the management center performs a mandatory protection switching on the active and standby microwave node devices by using the reliable communication channel, including:

The active microwave node device proxy center sends a message to take over the protection switching control right to the management center;

Receiving, by the management center, the takeover protection switching control right message, and determining, according to the fault state information and the working state information of the active and standby microwave node devices, whether the active and standby microwave node devices meet the transmission service condition;

And the management center sends a mandatory protection switching message to the active/standby microwave node device proxy center to perform protection switching of the active and standby microwave node devices;

In the case that it is determined that the transmission service condition is not met, the management center plans a transmission path according to the fault state information, and performs a forced protection switching on the proxy center of the active and standby microwave node devices according to the transmission path, and receives the The forced switching completion message returned by the active and standby microwave node device agent center is entered, and the monitoring state is entered;

When the communication between the active and standby microwave node device proxy centers returns to normal, the management center cancels the protection switching control right.

The method according to any one of claims 3 to 4, wherein, in the case that the active/standby microwave node device proxy center detects the power down message to confirm that the peer is powered off, the active and standby microwave nodes The device proxy center performs protection switching between the active and standby microwave node devices through the high-speed communication channel.

The method according to claim 9, wherein, in the case that the active/standby microwave node device proxy center detects the power failure message to confirm that the peer end is powered off, the active and standby microwave node device proxy center passes through the The protection switching of the active and standby microwave node devices in the high-speed communication channel includes:

If the primary microwave node device proxy center confirms the standby microwave node by detecting the power down message If the device is powered off, the active microwave node device agent center does not perform operations;

If the standby microwave node device proxy center confirms that the primary microwave node device is powered off by detecting the power failure message, the standby microwave node device agent center performs protection switching, and sets its own working state information as the primary state.

The method according to any one of claims 3 to 4, wherein, in the case that the remote standby alarm communication channel detects the remote alarm by the active/standby microwave node device proxy center, the primary The proxy node of the microwave node device performs protection switching of the active and standby microwave node devices through the high-speed communication channel.

The method according to claim 11, wherein, in the case that the remote standby alarm communication channel detects the remote alarm through the proxy center of the active/standby microwave node device, the active and standby microwave node device agents The protection switching of the active and standby microwave node devices by the center through the high-speed communication channel includes:

The proxy node of the active microwave node device detects whether the device is faulty according to the remote alarm. If the determination is yes, the active microwave node device proxy center performs protection switching of the active and standby microwave node devices; if the determination is no, The active microwave node device proxy center detects fault state information of the standby microwave node device;

If it is determined that the standby microwave node device is faulty, the primary microwave node device proxy center does not perform an operation, and if it is determined that the standby microwave node device does not have a fault, the primary microwave node device proxy center performs protection switching.

The method according to claim 12, wherein after the protection switching, the original standby microwave node device agent center detects whether the remote alarm is still present, and if the determination is yes, reports the original primary microwave node device. An undetectable fault alarm message appears.

14. A protection switching system, comprising:

The primary microwave node device proxy center is configured to determine one or more faults of the primary microwave node device or the standby microwave node device according to a preset multi-point fault detection policy, and The protection switching between the active and standby microwave node devices is performed through the protection switching communication channel when the communication between the standby microwave node devices is normal.

The standby microwave node device proxy center is configured to determine, according to the preset multi-point fault detection policy, that one or more faults occur in the primary microwave node device or the standby microwave node device, and the communication between the active and standby microwave node devices is normal. Protecting the protection switching between the active and standby microwave node devices by using a protection switching communication channel;

a management center, configured to receive a notification of the proxy center of the active and standby microwave node devices, and perform the notification on the active/standby microwave node device by using the protection switching communication channel in a case that the communication between the active and standby microwave node devices is abnormal Forced protection switching.

15. The system of claim 14 wherein:

The multi-point fault detection strategy includes at least one of the following: detecting a heartbeat message of the active and standby microwave node device proxy center, detecting a power down message, and detecting, by the active and standby microwave node device, a proxy center device fault information. Perform detection and detect remote alarms;

The protection switching communication channel includes: a high-speed communication channel between the active and standby microwave node device proxy centers, a reliable communication channel between the active and standby microwave node device proxy centers and the management center, and a remote alarm communication aisle.