300-420 Question #269: Real Exam Question with Answer & Explanation

Question

Which protocol runs between the vSmart controllers and between the vSmart controllers and the vEdge routers, and unifies all control plane functions under a single protocol umbrella?

Options

• AOMP
• BOSPF
• CIKE
• DVRRP
• EBGP

Explanation

OMP (Overlay Management Protocol) is the protocol specifically designed in Cisco SD-WAN to unify all control plane functions, facilitating communication between vSmart controllers and vEdge routers. It is essential for advertising routes, policies, and service information within the SD-WAN fabric.

Common mistakes.

• B. OSPF (Open Shortest Path First) is an interior gateway protocol used for routing within an autonomous system and is not the control plane protocol for Cisco SD-WAN overlay networks.
• C. IKE (Internet Key Exchange) is used for establishing security associations (SAs) and keys for IPsec, which provides data plane security, not control plane communication in Cisco SD-WAN.
• D. VRRP (Virtual Router Redundancy Protocol) provides default gateway redundancy for hosts on a LAN, and it is not involved in the SD-WAN control plane communication between controllers and routers.
• E. BGP (Border Gateway Protocol) is an exterior gateway protocol used for routing between autonomous systems, and while used in some SD-WAN deployments for underlay routing, it is not the unified control plane protocol for the overlay.

Concept tested. Cisco SD-WAN control plane protocol

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-sdwan-overview.html

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