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AR 387 BFD Failure Detection Mechanism
BFD Detects path failures between 2 adjacent routers.  A routing protocol failure could be a result of a misconfiguration.

BFD is a detection protocol designed to provide fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing protocols. In addition to fast forwarding path failure detection, BFD provides a consistent failure detection method for network administrators. Because the network administrator can use BFD to detect forwarding path failures at a uniform rate, rather than the variable rates for different routing protocol hello mechanisms, network profiling and planning will be easier, and reconvergence time will be consistent and predictable.

https:// www. examguides. com / CCNP-ENARSI/ ccnp-enarsi-cramnotes-4.htm

bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier

The Bidirectional Forwarding Detection (BFD) protocol is a simple hello mechanism that detects failures in a network. Hello packets are sent at a specified, regular interval. A neighbor failure is detected when the routing device stops receiving a reply after a specified interval.
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