F5OS API - not able to create vlan

Try the following;

curl -k -X PATCH -H'Content-Type: application/yang-data+json' -u admin:admin "https://192.168.10.11/api/data/openconfig-interfaces:interfaces/interface" --data @- <<EOF
{
 "interface": [
   {
    "name": "6.0",
    "openconfig-if-ethernet:ethernet": {
    "openconfig-vlan:switched-vlan": {
      "config": {
      "trunk-vlans": [940]
      }
    }
   }
  }
 ]
}
EOF