Indicates whether the port is a member or a forbidden
member in the forwarding information for this VLAN.
'addTagged' - to add the port in the tagged portlist.
'addUntagged' - to add the port in the untagged portlist.
'addForbidden' - to add the port in the forbidden portlist.
'delTagged' - to delete the port from the tagged portlist.
'delUntagged' - to delete the port from the untagged portlist.
'delForbidden' - to delete the port from the forbidden portlist.