What is the primary advantage of deploying BFD?

Bidirectional Forwarding Detection (BFD) is a lightweight, low-overhead protocol designed to detect failures in the forwarding path between two routers much faster than traditional routing protocol hello mechanisms. Routing protocols like OSPF or EIGRP have hello timers that typically range from seconds to tens of seconds. BFD can detect failures in milliseconds, allowing for quicker convergence and minimizing data loss. While BFD itself consumes some CPU, its primary advantage is speed, not CPU reduction. BFD operates at Layer 3, detecting failures between routing neighbors, not Layer 2 switched neighbor failures, which are typically handled by protocols like LACP or STP.