Which protocol is used by vSmart and vBond to distribute VPN reachability, routing, and policy information to SD-WAN edges?

• A. BGP
• B. OSPF
• C. LDP
• D. Overlay Management Protocol (OMP)

Answer: (D)

The concept being tested is how the SD-WAN overlay control plane distributes topology and policy information. In Cisco SD-WAN, the Overlay Management Protocol (OMP) is the channel used by vSmart and vBond to share VPN reachability, routing, and policy data with the SD-WAN edges. OMP carries per-VPN reachability, route advertisements, and policy configurations so each edge can build its forwarding state for the overlay.

Traditional routing protocols like BGP, OSPF, or LDP serve general routing or label-distribution roles in conventional networks and aren’t used to disseminate the overlay VPN information in this architecture. They may exist in the broader network, but the SD-WAN overlay relies on OMP for its control plane.