Overlay Management Protocol (OMP) is used by vSmart controllers to manage the overlay network fabric. A permanent secure connection is established by vEdge router to the vSmart controller via all available transport at the time of joining the SD-WAN fabric. vEdges use these DTLS Tunnels to exchange control plane information, for example, prefixes, crypto keys, and policy details with the controllers.

In the SD-WAN architecture, since control and data plane are separated, there is no OMP peering between the vEdge routers.

OMP advertises three types of routes:

• OMP routes (vRouter) are prefixes (Service VPN) at the local site, are redistributed into OMP and advertised towards the controllers. These routes might be OSPF or BGP. 
• TLOC routes (Transport locations) are the tunnel endpoints that connect vEdge router to the transport networks. These routes are comprised of three elements- System IP, Transport Color, and Encapsulation type.
• Service routes are used in order to exchange services such as firewall, IPS etc.