The following error message indicates an attempt to use the dladm reset-linkprop command failed.
dladm: warning: cannot reset link property 'zone' on 'net0': operation failed
See How to Use the dladm reset-linkprop Command. The running zone excl is using the device.
You can reset the value:
Type:
global$ ipadm delete-ip net0
Rerun the dladm command.