Design And Implementation Of Multi Tenant Quality Assurance Method Of Publish-Subscribe System Based On SDN

The SDN-based publish and subscribe system separates the control plane and the data plane through the programmability of SDN,realizes topic-based message filtering,and completes message transmission.When multiple tenants in the publish/subscribe system perform simultaneous publish/subscribe operations,the same network resources will be occupied at the same time,which will greatly reduce the quality of message transmission of each tenant.Therefore,this article attempts to transmit messages for multi-tenants on the original SDN-based publish/subscribe system Provide quality assurance.This paper is mainly realized from the following four aspects:Implement a multi-tenant management system for unified management of multi-tenants and menu authority distribution.Realize the routing optimization heuristic algorithm under bandwidth constraints,and based on the network virtualization platform Delftvisor,establish a virtual private network in the routing node for each tenant,isolate each tenant,and virtualize it.Realize the topic-based subscription aggregation function,process the topics with parent-child relationship in the same SDN switch,and issue them according to the multi-level flow table mode,reducing the number of flow table entries and improving the forwarding speed of the switch.Realize the end-to-end delay dynamic adjustment under the two-layer architecture.The control layer dynamically configures the delay constraint value of each switch according to user needs and path information as a reference for the controller to adjust the local bandwidth;the other part is the controller's local bandwidth adjustment,which is dynamically adjusted based on the queue delay and priority Queue bandwidth.The controller and the control layer rely on each other to restrict each other,so as to realize the dynamic adjustment of the queue bandwidth.Compared with the original system,the improved system implements a multi-tenant management system,network virtualization,subscription aggregation,and queue bandwidth adjustment,and basically provides message quality assurance for tenants of the SDN publish-subscribe system.Finally,in the real network environment built by the SDN switch,the system were tested,which verified the feasibility and effectiveness of the design in this paper.