Ethernet looped network implementation method with rapid fault recovery capability

The invention discloses an Ethernet looped network implementation method with a rapid fault recovery capability, which has relatively large limitation on the equipment form and the network topology structure, only supports the equipment form of an SOC (System On Chip) and a three-port switch, and only supports linear and single-loop network topology structures, so that equipment in a looped network protocol has the capability of actively notifying link change. According to the method, due to strict limitation on an equipment structure, a looped network structure and equipment in the looped network, the equipment in a looped network protocol has the capability of actively notifying link change and has the capability of recovering loop faults within 5 milliseconds; as the mac address learning functions of all switches in the looped network are closed, the root device can cache all messages in the looped network and screen out the messages which are not received by part of devices when the loop is disconnected f