How does MEF SD-WAN handle failover and high availability?

• A. It stores SLA definitions but does not switch paths.
• B. It relies on manual intervention to switch paths.
• C. It monitors link/tunnel health, supports active/active or active/passive configurations, and automatically reroutes traffic to healthy underlays or tunnels with rapid failover.
• D. It uses only static routes for failover.

Answer: (C)

In MEF SD-WAN, high availability comes from continuous health monitoring of all links and tunnels and from dynamic, policy-driven path selection. The system keeps an eye on the health of every underlay path and tunnel, applying proactive checks and performance metrics to decide which paths are healthy. It can run in an active/active setup, where traffic is shared across multiple good paths, or in an active/passive setup, where a secondary path is ready to take over. When a path becomes unhealthy or a tunnel fails, traffic is automatically rerouted to another healthy underlay or tunnel, delivering rapid failover with minimal disruption. This automation eliminates the need for manual intervention and avoids relying on static routes, ensuring continuous connectivity even as network conditions change.