Design And Implementation Of Smart Aggregated Network Element Redundancy System In Multi-link Heterogeneous Network

In order to obtain the running status and equipment information of the train in time at the control center,the on-board equipment needs to transmit a large amount of data generated by the on-board terminal to the data center through the communication link,so as to analyze the relevant data.On the ground side,Smart Aggregated Router(SAR)receives data generated from on-board equipment through multi-link parallel transmission,and aggregates the data and transmits it to the terminal.However,as the edge node of the intelligent fusion network,the SAR has a single network structure and lacks the ability to deal with network failures.If a single point of failure occurs in the SAR,it will directly affect the aggregation of data packets,causing interruption of terminal data delivery and making the network system reliable.reliability is greatly reduced.Based on the above background,this paper designs an intelligent aggregation network element redundancy system for multi-link heterogeneous networks,and implements and deploys it on the LINUX platform.The main work of the paper is as follows:Firstly,according to the usage scenarios of vehicle-mounted device communication,the corresponding communication requirements are analyzed,and a server redundancy backup system for heterogeneous networks suitable for multi-link parallel transmission scenarios is proposed.According to the functional division of the system,the virtual Router group design module,SAR state detection module,SAR switching strategy module,and function of notification alarm module.Secondly,according to the specific problems in the actual scene,this paper designs the working mechanism of the four modules accordingly.In view of the fact that the traditional link aggregation scheme cannot solve the problem of coexistence and encapsulation of mixed tunnels in multiple links,in the virtual router group design module,this paper proposes a general routing encapsulation method suitable for the coexistence of multiple links and multiple tunnels in redundant scenarios.Set the initial state for two SAR devices in the multi-link hybrid tunnel encapsulation scenario.Aiming at the asynchronous switching of multi-network port devices and the problem of loops during data transmission,in the SAR state detection module,this paper proposes a device state detection mechanism based on the link running state to realize the state Synchronize between multiple network ports.Aiming at the differences in the amount and importance of data carried by different communication links,in the SAR handover strategy module,this paper proposes a handover strategy based on the priority transmission of the master device and a handover strategy with the minimum number of handovers,in order to realize the intelligent fusion of network elements On-demand switching and data isolation of active and standby devices.Aiming at the problem that the network fault cannot be found in time,in the notification and alarm module,this paper realizes that when the SAR equipment fails,the alarm message is sent to the control center in time to improve the efficiency and real-time performance of equipment maintenance.Finally,in the LINUX physical environment,the relevant network equipment is deployed,and the functions of the four modules in the redundant system are tested and verified,which proves that the redundant system can effectively solve the single point of failure problem of SAR,to improve the reliability and survivability of smart aggregation network elements.