Research On The Implementation Technology Of IGMP Snooping For The Layer 2 Switch

Multimedia has been the chiefly media of amusement, education and the things of integration information.Conventional unicast of point to point on internet has not enough capability to support the transmission of lots of multimedia applications. The technology multicast just can resolve these problems. Ethernet switchs have been used widely in constructing networks now. And it is very necessary to realize multicast on switchs. In this paper, the multicast protocol (IGMP Snooping ) on ethernet switch is discussed.The paper firstly describes the development position and the users requirement of the muiticast and the Ethernet switchs ,introduces several foreign multicast technologies,and emphasizes the necessity of implementing the multicast to the Ethernet switchs.Secondly, it discusses how to carry out IGMP Snooping on the layer 2 switch devices in detail,and gives the testing method and several example.Finally, Through deep analysis , it can gasp the current methods and directions of realization multicast on Ethernet switch , and give some inspire for more consummation for technology of multicast on ethernet switch.The IGMP Snooping of this design ,its code size is little,and also has the features of little coupling with the lower protocol flat , good scalability , and convenient configuration interface.So,it applies not only the layer 2 switches,but also can be porting to other network devices ,eg.layer 3 switch easily.The testing on the layer 2 switch proves its correctness and integrity at the same time,The testing method in this article is helpful for the standardization of network multicast software test .