Method for restraining multicast flooding in intelligent substation

The invention relates to a method for restraining multicast flooding in an intelligent substation. The method comprises the following steps: (1) an intelligent device connected to a switch in a station level of the substation is determined; (2) the type of a service message of the intelligent device is determined; (3) a port which is needed for forwarding the message is determined; (4) a multicast group is created on the switch. According to the method, a static multicast creating method is adopted; due to the fact that the message forwarding port is determined in the switch, multicast flooding in the intelligent substation, particularly in a process level network can be effectively restrained, the network utilization rate is increased, and the real-time performance of service is ensured. Compared with a dynamic multicast technology, the static multicast method can lower the complexity and cost of the intelligent device and the switch and improve the reliability of a system. The multicast flooding is restrained by means of partitioning a VLAN, so that configuration is easy to operate and quite convenient to realize. The static multicast method can effectively overcome the limitation.