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Overlay transport virtualization

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

See also

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)

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Tunneling protocols

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