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

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.