What are the recommended methods for forcing a BIG-IP system tostandby mode?

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

BIG-IP providestwo supported and documented methodsto manually force a device intostandbystate in a high-availability (HA) configuration:

CLI method (A):

tmsh run /sys failover device standby

This is the correct and supported TMSH command to force thelocal deviceto transition fromactivetostandby.

Configuration Utility method (B):Navigating toDevice Management > Devices > Local Device (Self)and selectingForce to Standbyperforms the same operation through the GUI and is fully supported.

Why the other options are incorrect:

C is incorrect: Traffic Groups do not provide a “Force to Standby” option for the local device; traffic groups are used to manage which device owns specific traffic, not to force device-level failover.

D is incorrect: tmsh run /sys failover standby isnot a valid TMSH command. The correct syntax requires device standby.

Thus, the correct answers areA and B.