Link detection method and system

A link detection method includes: a server-side program acquiring connection relationships between a service interface of a TOR switch and service interfaces of various servers; the server-side program periodically sending a query message to each client-side program by means of a network management switch; in response to the query message, each client-side program returning, to the server-side program and by means of the network management switch, interface information of a service interface, which is included in a TOR switch or a server at which each client-side program is located and has connection relationships with service interfaces of other devices; and the server-side program reporting, to an upper-layer program, interface information of a service interfaces of the other devices, and the received interface information, such that the upper-layer program analyzes, on the basis of the interface information, connection situation of links for realizing corresponding connection relationships.