F5CABR: F5 Certified Administrator, BIG-IP Recertification

The pool-level "Action On Service Down" setting controls how the BIG-IP system handles existing connections when the pool member servicing them fails a health monitor check. Setting this option to "Reselect" instructs the system to redirect new packets belonging to those existing connections to another available pool member selected by the configured load balancing method, satisfying the requirement to keep sending traffic to a healthy member after a failure is detected. This option resides in the pool configuration, not on the virtual server, and is unrelated to monitor status manipulation or connection mirroring for persistence.