NetApp iscsi LUN MPXIO not working on Solaris 11.1 sparc

I want to setup MPXIO on a  iSCSI LUN provided by a NetApp FAS.
# prtconf -Dv
shows that mpxio is enabled on iscsi:
    iscsi, instance #0 (driver name: iscsi)
        System properties:
            name='instance' type=int items=1
                value=00000000
            name='mpxio-disable' type=string items=1
                value='no'
            name='load-balance' type=string items=1
                value='round-robin'

The NetApp can not enable ALUA for iSCSI Luns, so I have added to the scsi_vhci.conf the symmetric options:
    scsi_vhci, instance #0 (driver name: scsi_vhci)
        System properties:
            name='class' type=string items=1
                value='root'
            name='load-balance' type=string items=1
                value='round-robin'
            name='auto-failback' type=string items=1
                value='enable'