Which routing protocol carries control-plane information between vSmart controllers and WAN Edge routers in Cisco SD-WAN?
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Correct answer: OMP.
Why this is the answer
The Overlay Management Protocol (OMP) is the correct answer because it is the proprietary routing protocol used in Cisco SD-WAN to exchange control-plane information, including reachability information, policies, and VPN topologies, between vSmart controllers and WAN Edge routers. BGP (Border Gateway Protocol) and OSPF (Open Shortest Path First) are traditional routing protocols used for data plane routing within or between autonomous systems, but they do not carry the SD-WAN specific control-plane information. BFD (Bidirectional Forwarding Detection) is a protocol used for fast detection of forwarding path failures, not for exchanging routing or control-plane information.
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