Explanation:

An Overlay Transport Virtualization (OTV) join interface is the OTV technology that is a physical or logical Open Systems Interconnection (OSI) networking model Layer 3 interface. OTV is a means of simplifying the deployment of data center interconnect (DCI), enabling the extension of Layer 2 applications between data centers. An OTV join interface is used to connect an overlay network to remote overlay edge devices. An OTV join interface can be a physical interface, subinterface, or logical interface such as a port channel.

An OTV edge device is not a physical or logical Layer 3 interface. An OTV edge device is typically a virtual device context (VDC) running on a Cisco Nexus switch, such as a Nexus 7000 Series switch. The edge device is responsible for receiving Layer 2 traffic for virtual local area networks (VLANs) that are extended. Ethernet frame traffic is encapsulated into Internet Protocol (IP) packets and transmitted to the remote network. An OTV internal interface is a Layer 2 interface, not a Layer 3 interface. The OTV internal interface is an interface on the OTV edge device that connects to the VLANs that are being extended. Typically, the OTV internal interface operates similarly to any other Layer 2 switch trunk port or access port and does not require configuration specific to OTV.

An OTV overlay interface is a logical interface that is defined by the user. The OTV overlay interface receives and forwards any Layer 2 frames that must be transmitted to the remote site.

Reference:

Cisco Press CCNA Data Center DCICT 200-155 Official Cert Guide, Chapter 5: Data Center Overlay Networks, OTV Terminology, pp. 164-165

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