Integrating Blockchain with SDN for Secured and Scalable Network Function Virtualization in 5G+

The newer generation of mobile telecommunications networks (5G and 5G Plus networks) is spawning an increasing need for networks that are flexible, dynamic, and secure. The combination of Software Defined Networking (SDN) and Network Function Virtualization (NFV) approaches almost fully autonomous orchestration of networks. However, and unfortunately, the design of both SDN and NFV presents some degree of security and scalability challenges, notably in the context of centralized control and multi-tenant network virtualization. In this paper, focus on the application of blockchain approaches to integrating SDN to secure, scalable, trestles management of NFV for 5G Plus networks. For the first time, the proposed model connects the SDN network layer and NFV service layer through a blockchain-based DLT to ensure secure authentication, provide decentralized control, and verify the network state in real time. The use of smart contracts that service chaining and resource allocation automate reduction of managerial overhead and latency. When compared to SDN with NFV, the proposed model provides a significant improvement in the overall system resiliency of the network, the speed of fault recovery, and the protection of the system against DDoS and configuration attacks. The proposed integration of blockchain with SDN provides a scalable, robust SDN-NFV infrastructure that allows for the construction and deployment of smart and fully autonomous network systems.

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