The dladm command can be used with the reset-linkprop subcommand to reset the net0 link value to unassigned.
For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.2 .
global# dladm reset-linkprop -t -p zone net0 LINK PROPERTY PERM VALUE DEFAULT POSSIBLE net0 zone rw zoneA -- --
Troubleshooting
If the running zone is using the device, the reassignment fails and an error message is displayed. See Exclusive-IP Zone Is Using Device, so dladm reset-linkprop Fails.