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To understand what the Overlay Management Protocol (OMP) is and what its function is in Cisco Catalyst SD-WAN, we must start with the SD-WAN Controller.

vSmart

In Cisco SD-WAN, the vSmart controller is responsible for the centralized control plane. It has similar functionality to an iBGP route reflector in that it receives routing information from a client (a cEdge), calculates the best paths across the fabric, and then re-advertises this information to all other clients (other cEdges).

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