Research On Network Routing Strategy Of SDN Base On Atrributes Of Services

With the rapid development of information industry such as mobile Internet and Internet of things in recent years,the number of devices connected to the Internet has increased rapidly,and the types of network services have also increased.On the other hand,multimedia entertainment business for personal information on the proportion of consumption is also increasing,such businesses have certain requirements on the network bandwidth,the real-time performance index,the relevant business and cloud computing,big data and other emerging industries also need to consume a lot of bandwidth resources,so when the cyber source allocation is not reasonable.When possible local network overload,causing network congestion and network performance deterioration.Due to the different attributes of the business on the network QoS requirements are different,the occupation of network resources is not the same,so it is necessary to accurately identify the network load status,based on business attributes to achieve a reasonable routing strategy to prevent network load imbalance.SDN:Software Defined Network is a new network architecture with control and forwarding decoupling as the core,which supports more flexible and fine-grained network strategy,and makes the routing protocol global and scalable.In order to make the network as far as possible to meet the QoS requirements under the premise to improve the network load balancing level,combined with the software defined network technology,proposes a hierarchical routing algorithm based on service attributes(HTA-ToS:Hierarchical Topology Algorithm based on Type of Service).This algorithm by analyzing the relationship between the attributes of business to establish a business property model,and calculate the link bandwidth threshold of each business according to the business model of each service attribute,then according to the residual bandwidth of each link in the network,the link will not meet the threshold condition is removed from the business logic,logical topology to form various business the operation and routing algorithm in topology,avoid congestion link to achieve load balancing.In order to improve the performance of HTA-ToS algorithm in the case of multi service imbalance in the network,an improved scheme using OpenFlow group table is proposed,and a modularized system based on the algorithm is built in the enterprise level SDN network controller Floodlight.Finally,a simplified CHINANET backbone network topology is built on the simulation platform Mininet,and the random traffic model is used to verify the algorithm and the system.