Company XYZ was not satisfied with the reconvergence time OSPF is taking. BFD was implemented to try to reduce the reconvergence time, but the network is still experiencing delays when having to…

OSPF fast hellos provide sub-second hello intervals but rely on control-plane processing, making them less precise and more CPU-intensive than BFD echo mode for failure detection.

BFD echo mode sends test packets that loop back through the adjacent router's forwarding plane rather than its control plane, allowing the local device to control detection timing independently. Because forwarding-plane processing is typically handled in hardware at line rate, echo mode achieves sub-millisecond failure detection with minimal CPU overhead on the far end. This results in faster link failure notification to OSPF, reducing overall reconvergence time.

Changing to BGP would not improve reconvergence speed - BGP convergence is inherently slower than OSPF and the root issue is failure detection latency, not the routing protocol itself.

Reducing OSPF hello and dead timers is a less optimal approach than tuning BFD, and since BFD is already deployed it should be used as the primary failure detection mechanism rather than duplicating that role with OSPF timers.