HOTSPOT

Explanation:

The overlay interface is a logical interface that connects to the remote edge devices on the overlay network through an associated physical interface on the transport network.
The overlay network consists of one or more logical overlay interfaces that are created on the edge device in each remote site that connects to the physical transport network.
Reference: http://www.cisco.com/en/US/docs/switches/datacenter/sw/nx- os/OTV/config_guide/b_Cisco_Nexus_7000_Series_NX-
OS_OTV_Configuration_Guide_chapter_011.html#task_4CD4BC7B5C2140A1BD9619876E5A05