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Network virtualization creates logical network services on top of shared physical networking. The resulting virtual networks can give workloads separate connectivity, addressing, and traffic policies without requiring a separate set of cables and switches for each one. In a common data-center design, overlay edge devices encapsulate tenant traffic and send it across an IP underlay that forwards packets between those edges.
What network virtualization means
A virtual network is a logical service, not necessarily a physically separate network. It can provide Layer 2 (Ethernet-like) or Layer 3 (IP-level) connectivity to tenant systems while sharing physical infrastructure with other virtual networks. The IETF’s data-center framework describes these services and the devices that connect them in RFC 7365.
Network virtualization separates the logical network a workload uses from the physical infrastructure that transports its traffic. The virtual network defines such things as membership, addressing context, and connectivity; the underlying network supplies paths between the devices that implement the virtual network.
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In an overlay design, the tenant packet travels inside an outer packet addressed across the underlay. The underlay can forward that outer packet without knowing which tenant network the inner packet belongs to. At the destination, an overlay edge uses the virtual-network context to deliver the original packet to the right endpoint. This separation is the core idea in the IETF’s overlay problem statement and framework (RFC 7364; RFC 7365).
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- Map the destination: The sending network virtualization edge identifies the destination endpoint and the remote edge that can reach it.
- Encapsulate the packet: The edge adds an overlay header carrying the information needed to identify the virtual network and deliver the packet.
- Forward across the underlay: The physical network routes the outer packet between overlay edges, using underlay addresses and forwarding.
- Decapsulate and deliver: The receiving edge reads the overlay context, selects the appropriate virtual network and endpoint, removes the outer header, and forwards the tenant packet.
The network virtualization edge may be implemented in software, in a physical switch or router, or in a network service appliance; it is not necessarily a single type of hardware (RFC 7365).
What network virtualization is used for
A clearly documented use is multi-tenant data centers. A provider or enterprise can create distinct logical networks for separate tenants, applications, or services over shared infrastructure. Virtual networks can reuse the same IP addresses when those addresses exist in isolated network contexts, and workload placement or migration need not be bound to the underlay’s subnet boundaries. The IETF discusses these needs in RFC 7364 and its data-center use cases in RFC 8151.
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When traffic must cross from one virtual network to another, it can be directed through a gateway or another policy-controlled point. That lets administrators define where inter-network communication is permitted rather than treating every virtual network as automatically connected.
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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 one or both, depending on the services workloads need; these labels describe the service provided, not a particular product or protocol (RFC 7364; RFC 7365).
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Overlay and underlay
The overlay is the logical network: it carries tenant traffic and its virtual-network identity. The underlay is the transport network that connects the overlay edges. These are complementary layers of an architecture, not competing kinds of virtual network.
Architectures and encapsulation examples
Network virtualization can be implemented through different architectures and mechanisms, and the terms are not interchangeable. The IETF’s discussion includes approaches such as PBB, TRILL, LISP, SPB, BGP/MPLS IP VPNs, and NVO3 overlays (RFC 7364; RFC 7365). Geneve is a specified overlay encapsulation protocol; RFC 8926 describes its format. VLAN, MPLS, VXLAN, and NVGRE are other formats or mechanisms mentioned in the RFC’s introduction, but they do not all serve the same architectural role.
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Network virtualization versus SDN
Network virtualization is about providing logical network services over shared resources. Software-defined networking (SDN) is about programmability and how network control is organized, including separating control-plane decisions from packet forwarding. SDN may use logically centralized software control, while a virtual network describes the connectivity service presented to workloads. They address different concerns and can be used together; one is not another name for the other. The IETF treats their relationship as a research and architecture topic in RFC 8568.
Isolation, security, and trade-offs
Virtual networks can isolate traffic and address spaces, but logical separation alone does not encrypt packets or guarantee end-to-end security. The practical result depends on the implementation, configuration, and policies applied at network edges and gateways. Cross-network gateways can serve as controlled points for security policy, as discussed in RFC 7364.
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For Geneve specifically, operators should assess the risks relevant to their deployment and choose suitable mitigations; the protocol specification does not make every deployment secure by default (RFC 8926).
Virtualization also shifts operational work rather than eliminating it. An implementation must coordinate virtual-network membership and endpoint reachability with edge devices, underlay connectivity, gateways, and policy. When evaluating a design, useful comparison points include:
- Whether it provides the required Layer 2 service, Layer 3 service, or both.
- Its encapsulation and control-plane approach.
- Where network virtualization edges run and which endpoints they support.
- How it scales operationally and how complex it is to manage.
- How it integrates with gateways and existing network services.
- Which security controls it supports and where policy is enforced.
The cited IETF documents are architectural and standards references, not rankings of current vendors or measurements of performance gains.
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