Overlay transport virtualization

Overlay transport virtualization (OTV) is a Cisco proprietary protocol for relaying layer 2 communications between layer 3 computer networks.

• Distributed Overlay Virtual Ethernet (DOVE)
• 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
• Virtual Extensible LAN (VXLAN)
• Virtual LAN (VLAN)

• Cisco Overlay Transport Virtualization overview

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