A few settings of a logical SR-IOV port can be changed online, among other things
port_vlan_id – the VLAN ID for untagged packets
pvid_priority – the priority of untagged packets
The command for changing attributes is “lpar chsriov” (change SR-IOV logical port). In addition to the LPAR, the ID of the logical port concerned must be specified:
$ lpar chsriov aix22 2700c003 port_vlan_id=26 $
Which attributes can be changed online, can be looked up in the online help (“lpar help chsriov“).