renumber Solaris device instance numbers

In /etc/path_to_inst you can renumber the device instance numbers

"/pci@0,0/pci8086,340a@3/pci1734,11a9@0" 4 "ixgbe"
"/pci@0,0/pci8086,340a@3/pci1734,11a9@0,1" 5 "ixgbe"

to

"/pci@0,0/pci8086,340a@3/pci1734,11a9@0" 0 "ixgbe"
"/pci@0,0/pci8086,340a@3/pci1734,11a9@0,1" 1 "ixgbe"

reboot with reconfigure

touch /reconfigure or boot -r