What I have read so far on the web is that there is no way to add a reserved IP to an existing VM (unless I recreate the VM which I am trying to avoid). However, I have noticed
At this point, we don't support the capability to associate a Reserved IP to an already existing VM. We are currently working on the capability to reserve the IP of an existing VM.
Ref: http://azure.microsoft.com/blog/2014/05/14/reserved-ip-addresses/ http://www.petri.com/how-to-reserve-public-virtual-ip-addresses-in-microsoft-azure.htm
Girish Prajwal