The present application relates to the technical field of communications, and provides a routing detection method, a device, a system, and a storage medium. In the present application, an address and instruction information of a network device are carried in a notification packet, so that a network device receiving the notification packet can detect, according to the instruction information, routing reachability of the address of the network device corresponding to the notification packet, so as to realize automatic detection of the routing reachability. When routing detection is implemented by means of BFD, establishment of a BFD session can be automatically triggered, thereby avoiding establishing a BFD session between network devices in a manual configuration manner, and effectively improving routing detection efficiency.