Redundant switching method and device based on TTDP protocol

The invention provides a redundant switching method and device based on a TTDP protocol, and the method and device are used for solving a problem that a conventional TTDP protocol networking redundant switching mechanism cannot achieve the redundant switching when there is an interface fault. The method comprises the steps: enabling first equipment to monitor a monitoring interface through a VRRP protocol, wherein the monitoring interface is determined from the interface information of preset TTDP protocol parameters, the TTDP protocol parameters are operation parameters set for the TTDP protocol before the initial operation of the TTDP protocol, and the first equipment is main equipment in an equipment group where the first equipment belongs; and switching second equipment in the equipment group where the main equipment belongs to the main equipment when the interface fault is monitored. On the basis of a conventional VRRP protocol, the method achieves the monitoring of the state of an interface through the