A Resolution for IGMP V3 Protocol Using Finite State Machine

IGMP is an important multicast protocol in Internet. Its work mode can either be proxy mode or be snooping mode. A resolution for IGMP v3 protocol using Finite State Machine which works at proxy mode has been proposed. The IGMP proxy contains three parts: the IGMP proxy router, IGMP proxy host and IGMP querier. The IGMP proxy router handles the received IGMP packets from subscriber ports, stores and manages the joined groups and sources, as well as notifies IGMP host to send membership reports to uplink ports. The IGMP proxy host sends IGMP membership reports to uplink port according to the state changes of the groups in IGMP proxy router, and responds the query from uplink ports. The IGMP querier sends IGMP query messages to downlink ports according to the received "leave" messages.