Research On Multi-path Redundant Secure Routing Technology Of Satellite Network Based On SDN/NFV

Compared with the terrestrial Internet,satellite network has the advantages of large communication capacity and wide coverage.Satellite networks can cover the world.Even in deserts and oceans,satellite networks can provide the same satellite network services.However,the satellite is constantly moving around the ground,and the topology of satellite network is changing all the time.Satellite routing problem has become the focus and difficulty of satellite network research.Located in the space far away from the ground,satellites can hardly be upgraded to upgrade hardware.Compared with the update iteration speed of traditional computer hardware,the working time of the satellite is dozens of times of that of the ground network equipment,which leads to the shortage of satellite resources.Satellite network is dynamic,so satellite routing needs to be updated frequently.If the satellite is responsible for routing calculation,it will waste satellite resources seriously.Software Defined Network(SDN)is a new network architecture,which separates the control layer from the data layer,which provides a new idea for satellite routing calculation.This paper discusses the necessity of combining SDN with satellite network.Based on the software defined satellite network,this paper proposes a feasible secure routing scheme,including three aspects:inter-layer link switching scheme,multi-path routing scheme and redundant secure transmission scheme.The inter-layer link handoff scheme proposes a solution to the dynamic problem of satellite network.In this paper,virtual topology technology is used to transform dynamic satellite network into static one.The characteristics and motion laws of different Inter-Satellite Links(ISLs)are analyzed.This paper focuses on the inter-layer inter-satellite link handoff,proposing an inter-layer inter-satellite link handoff algorithm which optimizes the link length under the premise of less than the maximum handoff times.Multi-path routing scheme is a routing scheme for satellite network.Based on Ant Colony Optimization(ACO),this paper proposes a multi-path routing algorithm.The link QoS parameters of satellite network are modeled.On the premise of meeting the QoS requirements,the multi-path routing algorithm selects multiple shortest paths for each pair of source and destination nodes in the satellite network,reducing the coincidence rate of different paths as much as possible on the premise of considering the quality differences between different paths.To solve the security problem of satellite network data transmission,a multi-path redundant secure transmission technology based on secret sharing scheme is proposed.The combination of multi-path transmission and secret sharing can not only improve the security of data transmission,but also improve the ability of satellite network to deal with single point failure.