The disclosed method to dynamic find multicast router by Ethernet exchange based on IPv6 multicast basic protocol, which comprises: the Ethernet exchange triggers periodically the poll process on port to obtain router response and find out the distribution location of multicast router; when monitoring poll on some port, it means there is multicast router on this port, the exchange records the port number and writes the multicast router information into port distribution table. Compared with prior art, this invention is simple, has no modification to hardware, and saves cost. |