Select No limit to avoid limiting the bandwidth used for discovery.

Select An average of to limit the bandwidth used for discovery, then select the average (1-9999 Mbps) to set as the limit.

Select Only on policy update to perform full discovery only when a discovery policy changes.

Select On policy update or fingerprinting version update to perform full discovery when a discovery policy or a fingerprinting version changes.

Select Always to perform full discovery at the scheduled time, no matter what has changed. (Forcepoint does not recommend choosing "always," because this slows the discovery process.)