title: Softlayer API: How to get the static subnet belongs to which VSI?
body: <h1>background</h1>
  
  <p>I can get a vlan's subnet info by the flowing python script:</p>
  
  <pre><code># Declare an Object Mask to get additional information
      object_mask = 'mask[primaryRouter,subnets[id,billingItem,cidr,version,addressSpace,subnetType,networkIdentifier,totalIpAddresses,usableIpAddressCount,ipAddresses[ipAddress, isReserved, virtualGuest, hardware]]]'
      # Declare an Object Filter to get information from specific vlan
      filter = {'networkVlans': {'id': {'operation': vlan_id}}}
      return self.sl_account.getNetworkVlans(mask=object_mask, filter=filter)[0]
  </code></pre>
  
  <p>And the result contains:</p>
  
  <pre><code>[... 'subnets': [{'cidr': 28,
                'id': 986245,
                'billingItem': {'allowCancellationFlag': 1,}
                orderItemId': 223126909,
                'ipAddresses': [{'ipAddress': '169.38.73.xxx', ...
                 'subnetType': 'STATIC_IP_ROUTED',
               'totalIpAddresses': '8',
               'usableIpAddressCount': '5',
               'version': 4},
               ...]
              }
              ...
              ]]
  </code></pre>
  
  <h1>question</h1>
  
  <p>The result of STATIC_IP_ROUTED subnet do not contain the  virtualGuest item. </p>
  
  <ol>
  <li><p>Now I want to know which VSI has bind this subnet?  Does any other mask can helps?  </p></li>
  <li><p>Or, How can I get the secondary ip info of a vsi?       </p></li>
  </ol>