Multicast routing program, multicast routing method, and multicast router

摘要

A multicast routing program for allowing multicast data to be transmitted via a different route from a route for unicast data with higher reliability. A state-determining section determines whether all links on a predetermined transmission line to a multicast-transmission terminal device are connected, upon receiving a multicast reception request. If all the links on the predetermined transmission line are connected, a multicast-reception-request transmission section transmits the multicast reception request over the predetermined transmission line. If a link on the predetermined transmission line is disconnected, the multicast reception request is transmitted over a different transmission line. When receiving multicast data from the multicast-transmission terminal device, a multicast-data transfer section transmits multicast data through a communication interface to which the multicast reception request has been input.