Automatic Sync feature to save the configuration

When the Automatic Sync feature is enabled for a device group, the BIG-IP system automatically synchronizes configuration changes, but does not save the changes to the configuration files on each device in the device group. 

Configuring Automatic Sync to update configuration files on remote devices:

tmsh

modify /cm device-group <device group name> save-on-auto-sync true -11.5.0 and later

modify /cm trust-domain Root save-on-auto-sync true - 11.0.0 through 11.4.1

save /sys config