Research On Reliability Scheme Of Industrial Internet Service Function Chain

The information development of industrial network has gone through the stages of sensor network and Internet of things,and is moving towards the Industrial Internet era with business as the core.The existing carrier networks ensure reliable bearers by designing redundant bearer paths,while the Industrial Internet network resources are cross-domain and heterogeneous.How to ensure the reliability of redundant paths while taking into account the higher standards of real-time reliability and deterministic requirements of industrial services,further research is needed.For this reason,this thesis jointly considers the bearing capacity of SFC space-time dimension to carry out reliability design.The main work is as follows:(1)This thesis studies the concept,requirements and characteristics of SFC responsible for end-to-end service bearer in the industrial Internet virtualization environment,and analyzes and compares several kinds of IPFRR algorithms that ensure the reliable bearer of end-to-end path in the existing network.Based on this,the reliability design problem of redundant SFC is abstracted into a multipath coloring model in graph theory,which is technically summarized as an optimization problem of IPFRR.In engineering implementation,it is divided into three parts: pre-scheduling,fault detection and fault repair in Day0 blueprint phase,Day1 deployment phase and Day2 operation and maintenance phase.(2)Three key technologies of pre-scheduling,fault detection and fault repair in redundant SFC reliability design are studied.In the pre-scheduling technology,in order to provide the spatio-temporal unified bearing capacity of the redundant SFC is designed.The algorithm takes into account the environment of cut point and cut edge,the non-affinity and non-correlation deployment of joint nodes and paths,as well as the reliability and timeliness indexes of resources,and achieves the equivalent deterministic non-correlation effect between the primary backup SFC.In the fault detection technology,in order to improve the durability of redundant SFC protection,a service-aware cross-layer fault detection algorithm CLFD is designed by combining BFD fault detection mechanism and token bucket algorithm.CLFD algorithm extends the idea of one-way detection between BFD nodes to ensure the timeliness of end-to-end detection,and solves the problem of low detection efficiency in the case of industrial traffic burst through the cache provided by token bucket.In the fault repair technology,considering the inconsistency of decision and handover criteria in multiple staining path selection detected by CLFD,a distributed automatic control repair mechanism is designed to improve the handover success rate by setting random Backoff before handover to negotiate handover master control.(3)The implementation of different stages of the project is combined,this thesis takes the acquisition service as an example to simulate the effect of the three key technologies.The results show that,compared with other protection methods,the redundant SFC path provided by pre-scheduling algorithm has outstanding performance in the accurate response probability,packet loss rate and delay change index of end-to-end service after failure.Compared with the existing fault detection methods and handover mechanisms,the CLFD detection algorithm performs well in terms of fault decision efficiency and resource overhead,while the handover success rate under the automatic control repair mechanism is the best.Finally,from the point of view of the three technologies,the deterministic protection strategy proposed in this thesis has a significant improvement in improving the reliability of service bearer compared with other combination schemes.