Research On Construction And Maintenance Algorithm Of Application Layer Multicast Tree Based On Node Integrating And Security

Nowadays,the network has been popularized and popularized in a large scale.With the progress of technology,the network has deeply changed the way of people's life.People have more and more dependence and demand on the network.Data in network is mainly transmitted in unicast mode,but in some specific application environments,unicast has been unable to meet users' needs for network resources.So the researchers put forward the idea of multicast,first of all,the IP multicast scheme is proposed.However,IP multicast needs the support of a specific router and needs to change the existing network facilities,which has brought great difficulties to the deployment of IP multicast.As an alternative,the application layer multicast(ALM)scheme is proposed.ALM implements multicast service on the application layer terminal host,and it does not need to change the underlying physical link.ALM also does not need the support of specific routers.So it is easy to implement,and it has great flexibility.The application layer multicast has been widely studied because of the great application prospect.A typical application layer multicast protocol--NICE protocol,which adopts layering and clustering ideas,has good scalability and can be used to build large-scale multicast systems.However,there are still some problems in the NICE protocol.The NICE protocol only takes the distance between members as the reference standard of the leader,but does not consider the load capacity of the members.The cluster leaders will probably affect the stability of the multicast system.In addition,the NICE protocol does not take into account the security of multicast system.Once the cluster leader is successfully attacked,it will seriously affect the security of cluster members.This paper mainly focuses on the two issues related research.On the basis of maintaining the clustering and aggregation structure of NICE protocol,this paper proposes an index based on the integrating degree of members to improve the efficiency of cluster leader selection and clustering efficiency of multicast system.Simulation experiments prove that the scheme achieves certain results.In view of the lack of security in the NICE protocol,this paper puts forward the index of inspecting the security of members,the value of credibility of security,and gives the calculation method.By adjusting the multicast hierarchy regularly,we adjust the members whose security values are high to the important position of the multicast structure,while the members whose security values are low are adjusted to the location of the leaves.Finally,the effectiveness of the scheme is verified by the experimental simulation.