Communication state switching method, port configuration method, and communication system and medium

A method for switching communication state in a link aggregation system, which is applied to a cross-device link aggregation system comprising a gateway device, a first switch, a second switch, and a server, the method comprising:

• performing following operations, in response to a communication failure between a gateway device port and a first switch port:
• disconnecting a first communicative connection with the server by the first switch;
• establishing a second communicative connection between a server port and a second switch port;
• receiving a host route corresponding to the server port by the second switch;
• generating a 32-bit mask subnet route according to the host route by the second switch;
• receiving the 32-bit mask subnet route by the gateway device;
• and
• establishing a third communicative connection with the server port by the gateway device through the second switch according to the 32-bit mask subnet route.