A company is concerned it will run out of VLANs on its private cloud platform in the next couple months, and the product currently offered to customers requires the company to allocate three dedicated

GRE is a point-to-point tunneling protocol that does not provide a scalable multi-tenant identifier space comparable to VXLAN VNIs.

SR-IOV is a hardware virtualization feature that partitions a physical NIC into virtual functions for performance, but it does not address VLAN ID exhaustion or tenant network segmentation at scale.

VXLAN (Virtual Extensible LAN) uses a 24-bit Network Identifier (VNI), supporting approximately 16 million unique overlay networks compared to the 4,096-limit imposed by the 12-bit VLAN ID. Each customer's three dedicated tiers can be assigned unique VNIs, preserving the required segmentation and multi-tenant isolation. VXLAN encapsulates Layer 2 frames in UDP, allowing it to run over existing IP infrastructure without requiring additional physical hardware.

IPsec provides encryption and authentication for traffic between endpoints but does not create additional virtual network segments or solve the VLAN limit problem.