BFD & IP SLA Timer Calculator

Calculate failure-detection time for BFD sessions and IP SLA probes. Compare sub-second vs second-scale failover options.

BFD Detection Time

Detection time = max(desired_min_tx, required_min_rx) × detect_mult

Desired Min TX Interval (ms)

Required Min RX Interval (ms)

Detect Multiplier

IP SLA Failover Timer

IP SLA Frequency (s)

Threshold (consecutive failures)

Timeout per probe (ms)

BFD vs IP SLA Comparison

Common BFD Timer Presets

Profile	Min TX/RX (ms)	Multiplier	Detection Time	Use Case
Aggressive	50	3	150 ms	Datacenter, same-subnet peers
Balanced	300	3	900 ms	Most WAN links
Conservative	500	3	1500 ms	High-latency WAN, satellite
Slow (no BFD)	N/A		30–180 s	BGP hold-down timer fallback