Cloud Network Industry Development Whitepaper (2021): Evolution, Architecture, and Future Trends

With the rapid development of cloud computing and the rise of cloud‑network collaboration concepts, network infrastructure has become a critical foundation for cloud services, evolving into a distinct "cloud network" architecture and model.

The whitepaper first presents the background, system architecture, and major vendors' cloud network deployments, then examines technical characteristics, primary application scenarios, and several typical case studies, before concluding with future development trends and outlooks.

Three Evolutionary Stages :

Stage 1 – Traditional IDC gradually moves to cloudification, with increasing inter‑data‑center traffic. Virtual Private Cloud (VPC) emerges, and Overlay networking begins to address efficiency and cost issues.

Stage 2 – Hybrid‑cloud networking based on Data Center Interconnect (DCI) becomes mainstream; Overlay networks become the dominant form, supporting both internet and dedicated line access.

Stage 3 – Multi‑cloud demand grows, driving the need for multi‑cloud coordination, unified management, rapid resource scheduling, and elastic usage.

The cloud network comprises access, edge, and core layers, covering access networks, inter‑data‑center networks, and intra‑data‑center virtualized components.

Domestic and International Vendors :

Chinese telecom operators, cloud service providers, and cloud connectivity vendors are actively building a rich cloud‑network ecosystem.

Global players such as Google, AWS, and Azure focus on large‑scale infrastructure, leveraging proprietary networks, SDN, 5G, and extensive partner ecosystems (e.g., Cisco, Juniper) to enhance cloud‑network capabilities.

Gartner predicts distributed cloud as the next‑generation model, extending network coverage from data‑center to wide‑area and edge networks, requiring end‑to‑end integration of cloud, edge, and networking.

Edge Networking includes edge access, internal, and inter‑edge networks, demanding low latency, high bandwidth, massive connectivity, and strong security.

Cloud‑native technologies (containers, micro‑services, DevOps) introduce new requirements: CNI (Container Network Interface) for L2/L3 connectivity, Service Mesh for L4‑L7 functions, and integrated load‑balancing, ingress/egress routing, and traffic management.

Multi‑cloud interconnect must provide elastic scaling, cross‑domain connectivity, and disaster‑recovery capabilities, with MPLS VPN and SD‑WAN emerging as key enabling technologies.

SD‑WAN offers flexible, cost‑effective branch connectivity, automated provisioning, and centralized monitoring, addressing the limitations of traditional VPN and dedicated lines.

Overall, the whitepaper highlights the shift from single‑cloud to multi‑cloud environments, the increasing importance of intelligent, programmable networking, and the need for unified management platforms to support the evolving cloud‑network landscape.