The following command fails because you must disable inter-vnet-link before you set vsw-relay-mode=remote:
primary# ldm set-vsw vsw-relay-mode=remote primary-vsw0 Vswitch primary-vsw1 vsw-relay-mode is set to remote, inter-vnet-link should be off.
The following command verifies that the linkprop property is set correctly at the NIC level:
primary# dladm show-linkprop -p vswitchmode net0 LINK PROPERTY PERM VALUE EFFECTIVE DEFAULT POSSIBLE net0 vswitchmode rw remote remote local local,remote,auto