VxWorks环境下底层双冗余以太网卡关键技术实现

Implementation of NIC Switchover at Bottom Layer of Redundant Ethernet Network under VxWorks

在对可靠性要求较高的网络通信系统中,经常采用双网卡冗余备份的办法,这样,当正常通信的网卡出现故障或网络线路出现问题时可以快速地切换到另1块网卡。通过分析嵌入式实时操作系统VxWorks中数据链路层和网络层结构模型,阐述了如何在系统底层网卡的驱动程序中实现以太网卡的双冗余备份切换。经试验证明:该方法平均切换时间在5 ms以内。

In network communication systems requiring high reliability,dual NIC is frequently applied so that the communication can be switched to another card quickly when normal communication card or network is out of order.By analyzing the data link layer and network layer model under the real-time operating system VxWorks,the switchover of one of dual NIC cards to the other at bottom level is realized.