Virtual Extensible LAN
Distributed Overlay Virtual Ethernet (DOVE)
Ethernet VPN (EVPN)
GENEVE, an industry effort to unify both VXLAN and NVGRE technologies
Generic Routing Encapsulation (GRE)
IEEE 802.1ad, an Ethernet networking standard, also known as provider bridging, Stacked VLANs, or simply QinQ.
NVGRE, a similar competing specification
Overlay Transport Virtualization (OTV)
Virtual Local Area Network (VLAN)
Layer 2 Tunneling Protocol (L2TP)