Mechanisms for determining a network topology are disclosed. Client computer information messages are received from a plurality of client computers. The client computer information messages include a network identifier that identifies a network address of a respective client computer. A first link table that identifies ports of a first switch device and corresponding network identifiers of at least some client computers is received from the first switch device. A second link table that identifies ports of a second switch device and corresponding network identifiers of other client computers is received from the second switch device. A nodal tree structure is generated that identifies the plurality of client computers, the communication links between the plurality of client computers, the first switch device, and the second switch device based on the client computer information messages, the first link table, and the second link table.