Method, device and system for establishing disaster recovery backup channel

The invention discloses a disaster recovery channel establishment method, device and system, and the method comprises the following steps: a control device sends a first message to a first device in response to the satisfaction of a processing condition, and the first message comprises a first source IP address and a first destination IP address; after receiving the first message, the first device establishes a first disaster recovery channel with the second device according to the first source IP address and the first destination IP address, the first device and the second device are backups for each other, and the processing condition is related to the state of a second disaster recovery channel between the first device and the second device. According to the method, establishment of the disaster recovery backup channel between the first equipment and the second equipment can be realized, and the disaster recovery backup channel can be successfully established when the disaster recovery backup channel is at