This is a write-only style trigger: setting it to a nonzero number of timeticks schedules the standby card to force a reset of the active card and take over as the new active card once that delay elapses. Because this initiates a real failover and traffic switchover, setting a short delay effectively schedules an imminent, deliberate outage on the primary card's traffic while the standby takes control, so it's typically used for planned maintenance switchovers rather than emergencies. For example, an admin sets cardToRedundant to 500 (five seconds) to trigger a controlled switchover during a low-traffic maintenance window, then confirms the roles swapped via cardRedundState.