Which statements about using Bidirectional Forwarding Detection (BFD) in Cisco SD‑WAN are true?
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Correct answer: BFD cannot be disabled on SD-WAN routers., In addition to link-failure detection, it also measures loss and latency used by application-aware routing..
Why this is the answer
BFD is an integral component of Cisco SD-WAN and cannot be disabled on SD-WAN routers. It is continuously active for tunnel health monitoring. Beyond its primary role in rapid link-failure detection, BFD actively measures critical network performance metrics like loss, latency, and jitter. These metrics are crucial for application-aware routing policies, allowing the SD-WAN fabric to make intelligent decisions about the best path for application traffic based on real-time network conditions. OSPFv3 and BGP are supported with BFD for faster neighbor failure detection. BFD is typically enabled for OMP to ensure robust overlay connectivity.
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