Escrow is a term used in many types of businesses, but to keep things simple, weâre going to limit this discussion to what escrow means in terms of real estate. Escrow can be three things, and if we take those Wikipedia items in reverse order, they might make a little more sense.
OTV is an encapsulation protocol that wraps L2 frames in IP packets in order to transport them between L2 domains. Typically this would be between remote datacenters, but it could also be within a datacenter if you needed an easy (expensive) way to extend a VLAN.
When you configure OTV, you are defining 3 elements: 1  Join interface. This is the interface that faces the IP core that will transport OTV encapsulated packets between sites. 2  Overlay InterfaceThis is the virtual interface that will handle the encapsulation and decapsulation of OTV packets sent between OTV edge devices.