Topology detection method and topology detection apparatus

摘要

A topology detection apparatus includes, in a network having a tree-type topology: a route overlap judgment part that judges an existence or non-existence of an overlap between: a first route between terminals whose connection position are known; and a second route between a terminal whose connection position is known and a terminal whose connection position is unknown; and a topology detection part which determines the network topology based on the existence or non-existence of the first route and the second route.

主权项

1. A topology detection method comprising:
selecting a first route between a first terminal and a second terminal and a second route between a third terminal and a fourth terminal; judging an existence or non-existence of an overlap of the first route and the second route; and determining a network topology of a network based on the existence or non-existence of an overlap of the first route and the second route, wherein the judging the existence or non-existence of the overlap comprises: instructing a switch on the second route to learn to transfer a frame addressed to a predetermined terminal to the third terminal, instructing a switch on the first route to learn to transfer the frame addressed to the predetermined terminal to the first terminal after the learning of the switch on the second route; transmitting the frame addressed to the predetermined terminal from the fourth terminal; and performing a judgment of the overlap of the first route and the second route based on a terminal which receives the frame addressed to the predetermined terminal, wherein the judging the existence or non-existence of the overlap comprises: the third terminal transmitting a first frame whose source address is the predetermined terminal to the fourth terminal; the first terminal transmitting a second frame whose source address is the predetermined terminal to the second terminal after the transmitting of the first frame; the fourth terminal transmitting a third frame addressed to the predetermined terminal; and judging that the first route and the second route are overlapped to each other when a terminal receiving the third frame is the first terminal.