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for description of existing parameters please refer this page. http://incubator.apache.org/cloudstack/docs/api/apidocs-4.0.0/root_admin/createVlanIpRange.html^{Image Removed}

Validation.
#1 Will fail if the zone is not a basic zone or if forvirtual network is true.
#2 Will fail if the new subnet is subset or superset of the existing subnet.

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We intend to use the deleteVlanRange API to delete the IP ranges. The operations will be atomic. this will fail if any IP form the remove range is being used. While removing we acquire a lock on the valn that is being removed. When the subnet is removed the ip alias corresponding to this subnet The Ip Alias created on the virtual router will be removed form the VR.
#In case if a range being removed contains the ip address on which the dhcpserver is running (ie ip alias), cloudstack will try to acquire a new ip in the same subnet. In case if there is no free ip available in the subnet the remove command will failwhen the last VM or Nic form the subnet is removed.

DB changes:

created a new table nic_ip_aliase which is used to store the details of the ipalias created on the router per subnet.

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