网口容错在嵌入式设备中的设计与实现

Design and implementation of network fault tolerance on embedded devices

针对嵌入式网络设备的服务可靠性问题,现有的网口容错主要采用双网卡冗余设计,研究针对单网卡多网口的情况,提出了一种网口容错方法,该方法能有效利用系统带宽资源。提出的网口容错方法包括一种网口状态检测机制和故障网口服务数据迁移方法,并设计了相应的功能模块。故障检测模块实现基于Loopback的检测方法,容错处理模块则实现在检测到故障后,可将故障网口的服务负载数据根据迁移策略迁移到其余正常网口。所提出的方法实现了对网口工作状态的快速检测和负载数据的有效容错。该方法具有应用无关性、资源占用率低的特点,通过测试验证了该方法的可行性。

To deal with the service reliability of embedded network devices, the redundancy design of dual network cards is widely used in the existing network fault tolerance. We propose a method for network fault tolerance for the situation of single network card and multi network ports, which can effectively utilize the bandwidth resources of the system. It includes a network port state inspection mechanism and a fault network service data migration method, based on which we develop several functional modules. Fault detection module realizes the detection method based on Loopbaek. Fault tolerant processing module realizes the migration of fault network service loads when it detects any network fault. The proposed method can effectively detect network port state and hold the fault tolerance of load data. It features application independence and low resources occupancy rate, and the feasibility is verified through several tests.