BFD（Bidirectional Forwarding Detection） protocol is a mechanism which can improve the rate of detecting trouble and provide a guarantee for quickly repairing trouble among links. In order to quickly detect the trouble of adjacent devices and repair the faults while transmitting real-time traffic in IPRAN routing device， this paper discusses a mechanism between BFD and routing protocols, which deploys BFD to realize fast switching between master and backup routing in milliseconds， and repairs the network problems， improves the reliability of IPRAN network.