If the following error message is displayed:
dladm: warning: cannot reset link property 'zone' on 'bge0': operation failed
Referring to How to Use dladm reset-linkprop, the attempt to use dladm reset-linkprop failed. The running zone excl is using the device, which was assigned by executing ifconfig bge0 plumb inside the zone.
To reset the value, use the procedure ifconfig bge0 unplumb inside the zone and rerun the dladm command.