1. A method to manage data traffic in a data center having servers configured in communication over a hierarchical network with a plurality of layers, the method comprising: monitoring a first packet transfer of first packets over the hierarchical network between a first virtual machine under execution by a first server and a second virtual machine under execution by a second server, wherein individual ones of the first packets include a first identifier that corresponds to the first virtual machine, a second identifier that corresponds to the second virtual machine; based, at least in part, on the monitoring of the first packet transfer, determining that the first packet transfer utilizes a higher layer of the hierarchical network; and relocating the first virtual machine to a third server such that a second packet transfer of second packets over the hierarchical network between the first virtual machine under execution by the third server and the second virtual machine under execution by the second server does not utilize the higher layer of the hierarchical network.