SD-WAN Bidirectional Forwarding Detection (BFD)

The BFD (Bidirectional Forwarding Detection) is a protocol that detects link failures as part of the Cisco SD-WAN (Viptela) high availability solution, is enabled by default on all vEdge routers, and you cannot disable it.

BFD and related parameters:

• Path liveliness and quality measurement
• detection protocol: Up/Down, loss/latency/jitter,
• IPSec tunnel MTU,
• Runs between all routers in the topology
• Uses hello (up/down) interval, poll interval and multiplier for detection