BIG-IP provides two supported and documented methods to manually force a device into standby state 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 the local device to transition from active to standby .
Configuration Utility method (B) : Navigating to Device Management > Devices > Local Device (Self) and selecting Force to Standby performs 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 is not a valid TMSH command . The correct syntax requires device standby.
Thus, the correct answers are A and B .
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