Discover the protocol used for control plane communication between Cisco vSmart controllers and WAN Edge routers when the vSmart acts as a route reflector in the SD-WAN architecture.
Table of Contents
Question
Which protocol runs between the vSmart controllers and WAN Edge routers when the vSmart controller acts like a route reflector?
A. IPsec inside the DTLS/TLS control connection
B. BGP inside the DTLS/TLS
C. OMP outside the DTLS/TLS control connection
D. OMP inside the DTLS/TLS control connection
Answer
D. OMP inside the DTLS/TLS control connection
Explanation
When the Cisco vSmart controller acts as a route reflector in the SD-WAN architecture, it communicates with the WAN Edge routers using the Overlay Management Protocol (OMP) running inside the Datagram Transport Layer Security (DTLS) or Transport Layer Security (TLS) control connection.
The OMP is the proprietary control plane protocol used in Cisco SD-WAN to exchange routing information, distribute policies, and manage the overlay network. It runs inside the secure DTLS or TLS control connection established between the vSmart controllers and the WAN Edge routers.
The vSmart controller, acting as a route reflector, receives and reflects OMP routes and information from and to the WAN Edge routers, enabling efficient distribution of routing and policy information across the SD-WAN fabric.
The other options are incorrect or incomplete:
A. IPsec is used for data plane encryption but not for control plane communication between vSmart and WAN Edge routers. B. BGP is not used for control plane communication between vSmart and WAN Edge routers in the SD-WAN architecture. C. OMP does not run outside the DTLS/TLS control connection; it runs within the secure control connection.
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