Which protocol is used between WAN Edge routers and vSmart controllers to exchange overlay routing information?

• A. Bidirectional Forwarding Detection (BFD)
• B. Overlay Management Protocol (OMP)
• C. Locator/ID Separation Protocol (LISP)
• D. Control And Provisioning of Wireless Access Points (CAPWAP)

Answer: (B)

The protocol that handles the exchange of overlay routing information between WAN Edge routers and vSmart controllers is the Overlay Management Protocol (OMP). OMP is the control-plane protocol used by the Cisco SD-WAN fabric to distribute overlay routes, policies, and session state between edges and the vSmart controllers. It enables edges to learn the best paths and policies from vSmart and for vSmart to push routing decisions back to the edges, forming and maintaining the overlay network.

BFD is a fast failure-detection mechanism and isn’t used for distributing overlay routing information. LISP is a separate IP address/route separation protocol not used here to exchange overlay routing data in this context. CAPWAP is for managing wireless access points and their controllers, not for SD-WAN edge-to-vSmart overlay routing.