CN112615728A - Simulation system master-slave switching method based on railway safety communication protocol - Google Patents
Simulation system master-slave switching method based on railway safety communication protocol Download PDFInfo
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- CN112615728A CN112615728A CN202011283308.3A CN202011283308A CN112615728A CN 112615728 A CN112615728 A CN 112615728A CN 202011283308 A CN202011283308 A CN 202011283308A CN 112615728 A CN112615728 A CN 112615728A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/70—Details of trackside communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
Abstract
The invention relates to a simulation system main-standby switching method based on a railway safety communication protocol, which comprises the following steps: step S1: initializing a system, and selecting a simulation protocol simulated by an external simulation system; step S2: compiling an automatic switching script or a manual switching script and sending a switching command; step S3: before executing the switching command, the main and standby systems of the simulation system need to carry out data synchronization; step S4: after the main system and the standby system of the simulation system receive the switch command, the synchronization of the main system and the standby system is confirmed at the same time, and the roles of the main system and the standby system are respectively converted into the standby system or the main system; step S5: and recording the network information in the switching process. Compared with the prior art, the method and the device have the advantages of solving the problems of safety communication interruption and application data interruption caused by the switching of the safety communication protocol between two computers and the like.
Description
Technical Field
The invention relates to a main/standby switching method of a railway signal system, in particular to a simulation system main/standby switching method based on a railway safety communication protocol.
Background
In the application of the railway signal system safety communication, the main standby machine of the local system and the main standby machine of the target safety system are interconnected in a double-network cross mode. Common industry standard secure communication protocols are RSSP1, RSSP2 and other communication protocols. For example, 4 communication layer links are established between the train control center master-slave system and the interlocking master-slave machine through the dual-network, and the security layer adopts the RSSP1 protocol.
In the actual operation process of the safety system, the system only receives data of the main system, the standby system is used as a hot standby, and the standby system can be upgraded to the main system after the main system has errors, so that a scene that the main system and the standby system are switched is often generated, namely the standby system is upgraded to the main system, and the main system is downgraded to the standby system.
Through retrieval, chinese patent publication No. CN110380915A discloses a hot standby redundancy monitoring device based on a secure communication protocol, which specifically includes a switching module and a synchronization module, where the synchronization module includes two rail transit signal devices that are redundant to each other, one of the devices serves as a host and the other serves as a standby, the host outputs data and periodically performs data interaction with the standby, the standby periodically receives and processes the synchronization data sent by the host, compares the operation result of the standby with the operation result of the host, and switches the device state of the standby according to the comparison result; and the switching module acquires the equipment states of the two rail traffic signal equipment and switches the equipment states of the main machine and the standby machine. The method aims to solve the technical problems that a main backup machine in the prior art is difficult to quickly locate when a fault occurs, double main problems are easy to occur and a switching mode is single, but in an actual switching scene, the situation that communication with an opposite system is interrupted due to main backup switching often occurs, and real environment simulation of a system to be tested cannot be achieved.
Disclosure of Invention
The invention aims to provide a simulation system master-slave switching method based on a railway safety communication protocol, which is used for solving the problems of safety communication interruption and application data interruption caused by the double-machine switching of the safety communication protocol.
The purpose of the invention can be realized by the following technical scheme:
according to one aspect of the invention, a method for switching between main and standby simulation systems based on a railway safety communication protocol is provided, which comprises the following steps:
step S1: initializing a system, and selecting a simulation protocol simulated by an external simulation system;
step S2: compiling an automatic switching script or a manual switching script and sending a switching command;
step S3: before executing the switching command, the main and standby systems of the simulation system need to carry out data synchronization;
step S4: after the main system and the standby system of the simulation system receive the switch command, the synchronization of the main system and the standby system is confirmed at the same time, and the roles of the main system and the standby system are respectively converted into the standby system or the main system;
step S5: and recording the network information in the switching process.
As a preferred technical solution, the simulation protocols in step S1 include RSSP1, RSSP2, and FSFB2 protocols.
As a preferred technical solution, the step S1 specifically includes the following steps:
s101) respectively simulating a main system and a standby system of an external system through different processes or threads;
s102) simulating an external single system to respectively establish connection with a main system and a standby system of a system to be tested;
s103) for RSSP1 protocol, the security layer message sent by the external system contains a master/standby machine mark;
s104) for RSSP2 protocol, the security layer messages sent by the external system are identical.
As a preferred technical solution, the manual switching in step S2 is specifically: and sending a main/standby switching command through manual control.
As a preferred technical solution, the automatic switching in step S2 is specifically: and sending a main/standby switching command at regular time through the test script to realize scene simulation during copying.
As a preferred technical solution, the data synchronized in step S3 includes:
s301) the master system and the standby system of the simulated external system synchronize protocol safety layer data each period
S302) the master system and the standby system of the simulated external system synchronize application data every period.
As a preferred technical solution, the data synchronized in S301 includes a security layer connection state, current cycle timestamp information, and security check information.
As a preferred technical scheme, when the main/standby switch is performed, the safety data received from the system to be tested can be checked according to the synchronous information, and data check failure caused by errors of the timestamp and the safety check data is avoided.
As a preferred technical solution, the synchronization of S302 can ensure the consistency of data transmitted and received by the master system and the backup system of the simulated external system.
As a preferred technical solution, in the step S5, network data of the switching process is automatically recorded, and when the secure connection is interrupted, a field log of the connection interruption is provided, and a reason of the disconnection of the secure connection is recorded for analysis.
Compared with the prior art, the invention has the following advantages:
1) the invention solves the problems of safety communication interruption and application data interruption caused by the switching of the safety communication protocol between two computers;
2) the invention can realize the master-slave switching simulation of various safety communication protocols, and is convenient for testing the stability of the tested system;
3) the invention adopts an automatic switching mode, which is convenient for long-time copying simulation to test the stability of the tested system;
4) the invention adopts script control, is flexible to compile, and can realize two modes of manual operation and automatic operation;
5) the invention adopts the automatic recording function, thereby being convenient for finding problems.
Drawings
FIG. 1 is a diagram of a dual net cross-interconnect;
FIG. 2 is a schematic diagram of the active/standby switching according to the present invention;
fig. 3 is a flow chart of the main backup cutting machine of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The invention discloses a main-standby switching method of a secure communication protocol simulation system, which solves the problems of secure communication interruption and application data interruption caused by the switching of a secure communication protocol on a dual computer, and is structured as shown in figure 2.
The specific process of the invention is as follows:
step S1: initializing the system, and selecting simulation protocols simulated by the external simulation system, such as RSSP1/RSSP2/FSFB2 protocols;
s101) simulating a main system and a standby system, an A machine and a B machine of an external system respectively through different processes or threads.
S102) establishing connection between the simulated external single system and the main system and the standby system of the system to be tested respectively.
S103) for the RSSP1 protocol, the security layer message sent by the external system comprises a main/standby, A/B machine mark.
S104) for RSSP2 protocol, the security layer messages sent by the external system are identical.
Step S2: compiling an automatic or manual switching script and sending a switching command;
s201) manual switching, wherein a main/standby switching command is manually sent through manual control;
s202), automatic switching can be realized, and the automatic switching can realize scene simulation during copying by sending a main/standby switching command through a test script at regular time.
Step S3: before executing the switching command, the main and standby systems of the simulation system need to perform data synchronization, and the synchronized data mainly comprises:
s301) the master system and the standby system of the simulated external system synchronize protocol security layer data every period. The synchronized data should include the security layer connection status, the current period timestamp information, and the security check information. Therefore, when the main and standby switches, the safety data received from the system to be tested can be verified according to the synchronous information, and the problem that safety connection is disconnected due to data verification failure caused by the error of the timestamp and the safety verification data is avoided.
S302) the master system and the standby system of the simulated external system synchronize application data every period. Therefore, the consistency of data transmission and reception of the main system and the standby system of the simulated external system can be ensured. In a fault test scenario, inconsistency of data sent by the master system and the standby system needs to be supported.
Step S4: when the main system and the standby system of the simulation system receive the switch command, the synchronization of the main system and the standby system is confirmed, and the roles of the main system and the standby system are respectively converted into the standby system/the main system
Step S5: recording network information in the switching process: and automatically recording network data in the switching process, providing a field log of the connection interruption when the safety connection is interrupted, and recording the reason of the disconnection of the safety connection for analysis.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Referring to fig. 3, step S1 is executed to establish RSSP1 primary/secondary switching simulation system;
different processes are established through S101 to simulate a main system and a standby system, an A machine and a B machine of an external system of the RSSP1 respectively.
After the simulation test system is established, a connection is established with the master system and the backup system of the system under test through step S102.
For the RSSP1 protocol, the security layer message sent by the external emulation system contains the host/standby, a/B machine flag.
In the simulation system, there may be various combinations, such as a owner and B backup, or B owner and a backup;
the machine A is set as a main machine and the machine B is set as a standby machine in the example;
by step S2: writing an automatic or manual switching script, sending a switching command, and simulating the main system and the standby system of the system to perform data synchronization through step S3 before executing the switching command. In the structure of the security layer, the data of the security protocols of the main and standby systems need to be synchronized to ensure that the security link is not interrupted after switching. Security layer data
During the handover, the network message needs to be recorded by step 5 for analyzing the problem.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A simulation system active-standby switching method based on a railway safety communication protocol is characterized by comprising the following steps:
step S1: initializing a system, and selecting a simulation protocol simulated by an external simulation system;
step S2: compiling an automatic switching script or a manual switching script and sending a switching command;
step S3: before executing the switching command, the main and standby systems of the simulation system need to carry out data synchronization;
step S4: after the main system and the standby system of the simulation system receive the switch command, the synchronization of the main system and the standby system is confirmed at the same time, and the roles of the main system and the standby system are respectively converted into the standby system or the main system;
step S5: and recording the network information in the switching process.
2. The method as claimed in claim 1, wherein the emulation protocol of step S1 includes RSSP1, RSSP2 and FSFB2 protocols.
3. The method for switching between master and slave emulation systems according to claim 2, wherein step S1 specifically includes the following steps:
s101) respectively simulating a main system and a standby system of an external system through different processes or threads;
s102) simulating an external single system to respectively establish connection with a main system and a standby system of a system to be tested;
s103) for RSSP1 protocol, the security layer message sent by the external system contains a master/standby machine mark;
s104) for RSSP2 protocol, the security layer messages sent by the external system are identical.
4. The method for switching between master and slave emulation systems according to claim 1, wherein the manual switching in step S2 is specifically: and sending a main/standby switching command through manual control.
5. The method for switching between master and slave emulation systems according to claim 1, wherein the automatic switching in step S2 specifically comprises: and sending the main/standby switching command at regular time through the test script.
6. The method according to claim 1, wherein the data synchronized in step S3 includes:
s301) the master system and the standby system of the simulated external system synchronize protocol safety layer data each period
S302) the master system and the standby system of the simulated external system synchronize application data every period.
7. The method according to claim 6, wherein the data synchronized in S301 includes a security layer connection status, current period timestamp information, and security check information.
8. The method according to claim 7, wherein when the master/slave switching is performed, the safety data received from the system under test can be checked according to the synchronization information, thereby avoiding data check failure due to errors of the timestamp and the safety check data.
9. The method for master-slave switching of the simulation system based on the railway safety communication protocol as claimed in claim 6, wherein the synchronization of S302 can ensure the consistency of data transmission and reception between the master system and the slave system of the simulated external system.
10. The method for switching between master and slave emulation systems according to claim 9, wherein in step S5, network data of the switching process is automatically recorded, and when the safety connection is interrupted, a field log of the interruption of the connection is provided, and the reason of the disconnection of the safety connection is recorded for analysis.
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