Network virtualization creates logical network services on top of shared physical infrastructure. A virtual network can give systems their own Layer 2 or Layer 3 connectivity without requiring separate physical cabling and switches for every network. In a common data-center design, software or hardware edge devices encapsulate tenant traffic and carry it across an IP underlay, which forwards packets between those edges.
What network virtualization means
A virtual network is a logical service, not necessarily a separate physical network. The physical infrastructure still carries the traffic, while virtualization separates network membership and service from the equipment and links doing the forwarding. The IETF’s RFC 7365 describes data-center network virtualization that can provide Layer 2 or Layer 3 connectivity to tenant systems.
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That separation can let different tenants or services use isolated logical networks over shared infrastructure. It can also allow the same IP addresses to be used in separate virtual networks, because each network has its own context. Isolation is a network-design property; by itself, it does not mean traffic is encrypted or that every security risk is addressed.
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How a network virtualization overlay works
A common approach uses an overlay: a logical network carried over an IP underlay. The overlay preserves the tenant network’s identity and traffic, while the underlay provides connectivity between the devices at the overlay’s edges. The IETF explains this model in RFC 7364 and RFC 7365.
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- The sending edge identifies the destination. It maps the tenant packet’s destination to the remote edge that can reach it.
- The edge encapsulates the packet. It adds an outer header that carries the packet across the underlay while retaining the tenant packet and its virtual-network context.
- The underlay forwards the outer packet. Underlay routers use the outer addressing to deliver it to the remote edge; they do not need to understand the tenant’s logical network separation.
- The receiving edge decapsulates and delivers it. It uses the overlay context to select the correct virtual network and endpoint, removes the outer encapsulation, and forwards the original packet.
Network virtualization edges may be implemented in software switches, physical switches or routers, or network service appliances, depending on the design.
What network virtualization is used for
The clearest documented use case is a multi-tenant data center. A provider or enterprise can create distinct logical networks for tenants or services while using shared physical infrastructure. Systems can be placed or moved without requiring tenant IP addressing to match the underlay’s subnet boundaries. Separate virtual networks can also reuse address space, provided their traffic remains isolated.
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When traffic needs to cross from one virtual network to another, it should pass through a configured gateway or another policy-controlled point. That gives operators a place to apply routing and security rules rather than allowing unrestricted communication between isolated networks.
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Layer 2 and Layer 3 virtual networks
A Layer 2 virtual network provides Ethernet-like connectivity. A Layer 3 virtual network provides IP-level connectivity. A deployment may use either service or both, depending on what its connected systems and applications require. These describe the service offered, not a particular encapsulation protocol.
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Overlay and underlay
The overlay is the logical network carrying tenant identity and traffic. The underlay is the physical or routed network that transports packets between overlay edges. An overlay does not replace the underlay: it depends on the underlay’s reachability.
Architectures and encapsulation mechanisms
Network virtualization is a broad architectural goal, not one protocol. IETF documents discuss approaches including PBB, TRILL, LISP, SPB, BGP/MPLS IP VPNs, and NVO3 overlays; these have different roles and are not interchangeable products. Geneve is a specified overlay encapsulation protocol. RFC 8926 describes Geneve alongside other encapsulation formats such as VLAN, MPLS, VXLAN, and NVGRE.
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When evaluating an implementation, compare the Layer 2 or Layer 3 service it provides, its encapsulation and control-plane approach, where its network edges can run, how it integrates with gateways and existing services, and the scale and operational complexity it introduces. The cited standards describe architectural considerations; they do not rank current vendors or products.
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Network virtualization vs. SDN
Network virtualization and software-defined networking (SDN) are related, but they answer different questions. Network virtualization is about providing logical network services over shared resources. SDN is about making network behavior programmable and separating control from packet forwarding, often through logically centralized software control. The concepts can be used together, but neither is a synonym for the other. See the IETF’s RFC 8568 for discussion of network virtualization research challenges.
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Security and trade-offs
Logical separation can help isolate traffic and address spaces, but it should not be mistaken for encryption or a complete security guarantee. Security depends on the implementation, configuration, and policies governing communication between networks and endpoints. Controlled entry and exit points, such as security gateways, can enforce those policies.
For Geneve specifically, RFC 8926 says operators should assess which security risks apply to their deployment and choose mitigations accordingly. The same practical principle applies more broadly: determine what is isolated, what is allowed to communicate, and which controls protect traffic at the relevant edges and gateways.
Quick Recap
Further reading from the IETF
- RFC 7364: Problem Statement: Overlays for Network Virtualization (October 2014).
- RFC 7365: Framework for Data Center (DC) Network Virtualization (October 2014).
- RFC 8014: An Architecture for Data-Center Network Virtualization over Layer 3 (NVO3) (January 2017).
- RFC 8151: Use Cases for Data Center Network Virtualization Overlay Networks (March 2017).
- RFC 8568: Network Virtualization Research Challenges (April 2019).
- RFC 8926: Geneve: Generic Network Virtualization Encapsulation (November 2020).
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