300-415 Question #346: Real Exam Question with Answer & Explanation

The correct answer is D: OMP inside the DTLS/TLS control connection. OMP (Overlay Management Protocol) is the SD-WAN control plane protocol that runs between vSmart controllers and WAN Edge routers, secured inside DTLS or TLS control connections, mirroring the route-reflector model of BGP.

Architecture

Question

Which protocol runs between the vSmart controllers and WAN Edge routers when the vSmart controller acts like a route reflector?

Options

AIPsec inside the DTLS/TLS control connection
BBGP inside DTLS/TLS
COMP outside the DTLS/TLS control connection
DOMP inside the DTLS/TLS control connection

Explanation

OMP (Overlay Management Protocol) is the SD-WAN control plane protocol that runs between vSmart controllers and WAN Edge routers, secured inside DTLS or TLS control connections, mirroring the route-reflector model of BGP.

Common mistakes.

A. IPsec is used for data plane encryption between WAN Edge peers and does not run between vSmart and WAN Edge routers for control plane route exchange.
B. BGP does not run between vSmart controllers and WAN Edge routers; OMP is the protocol used in this role, even though vSmart behaves like a route reflector conceptually.
C. OMP does not run outside the DTLS/TLS connection; all SD-WAN control plane traffic between vSmart and WAN Edge is encapsulated within the secure DTLS or TLS session.

Concept tested. OMP inside DTLS/TLS between vSmart and WAN Edge

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-omp.html

Topics

#Cisco SD-WAN#OMP#vSmart controller#Control Plane

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