| The Internet has become an indispensable part of people's lives.But the existing network architecture is difficult to meet a variety of emerging applications and technology deployment requirements,the phenomenon of network ossification becomes more obvious.Network virtualization is an important technology to solve the problem of network ossification.It can provide customized and differentiated services for network lessees by constructing multiple parallel virtual networks that operate on shared physical network facilities.Virtual router platform is the key equipment to implement network virtualization.In order to support a certain number of router instances,virtual router platforms are usually made up of cluster servers.As administrators continue to create and delete router instances,router instances are scattered across different physical machines.This causes the number of physical machines occupied by the router instance to exceed the number of the lowest physical machines occupied by the router instance.As a result,the resource utilization of the virtual router platform is low and the power consumption is too large.Therefore,it is very important to study the energy saving in the virtual router platform to reduce the energy consumption of the virtual network and to construct the green network.In this paper,a new virtual router architecture is proposed to support the dynamic migration of forwarding plane.The architecture of the virtual router is divided into four layers: the interface plane,the forward plane and control plane and resource management plane,the resource management plane sends new flow table information to the interface plane and directs the data flow to the new forward instance,to solve the problem of data flow automatic switching in the migration process.Based on this architecture,a dynamic forward mechanism of virtual router forward plane is proposed.In the migration process,the new and old forward instances are simultaneously forwarded to reduce the packet loss rate during the data transmission process.On the basis of reading the current literature on network energy saving,this paper proposes a dynamic migration algorithm based on energy consumption for virtual router forward instance.The main idea is the network administrator pre-set the upper limit and lower limit of physical resource utilization,when the forward plane resource utilization rate exceeds the upper limit of three consecutive cycles,in order to enhance the user experience,execute the high-load migration;when the forward plane resource utilization continuous three cycles are lower than the lower limit,a low-load migration is performed to reduce the power consumption of the virtual router platform.The forward instance is dynamically migrated to fewer forward planes to change the mapping between the forward instance and the forward plane,and shut off idle forwardplane to make the energy consumption of the virtual router platform become lower.The experiment shows that the algorithm can improve the CPU utilization from 34.46% to64.62%,the memory utilization rate from 22.25% to 50.68%,the bandwidth utilization rate from 30.23% to 58.29%,and the total power consumption of virtual router platform decreased from 2.35 KW to 1.27 KW in the process of the number of transfer cases increasing from 0 to 30.Finally,the prototype system is implemented on the basis of 973 project "Reconfiurable Network Emulation Testbed for Basic Network Communication",and the migrating performance of prototype system.Experimental results show that the transition time is about 44.81 seconds when the number of routing tables is 500 K and single-hop forwarding time is about 0.424 ms.The packet loss rate increases from 0 to0.215,when the bandwidth of data traffic ranges from 0 to 2000 MB. |
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