A data-link name must be assigned exclusively to a single zone.
The dladm show-link command can be used to display data-links assigned to running zones.
sol-t2000-10{pennyc}1: dladm show-link LINK CLASS MTU STATE OVER vsw0 phys 1500 up -- net0 phys 1500 up -- netg2 phys 1500 up -- netg1 phys 1500 up -- netg3 phys 1500 up -- zoneA/net0 vnic 1500 up net0 zoneB/net0 vnic 1500 up net0 aggr1 aggr 1500 up net2 net3 vnic0 vnic 1500 up net1 zoneA/vnic0 vnic 1500 up net1 vnic1 vnic 1500 up net1 zoneB/vnic1 vnic 1500 up net1 vnic3 vnic 1500 up aggr1 vnic4 vnic 1500 up aggr1 zoneB/vnic4 vnic 1500 up aggr1
For more information, see dladm(1M).