Where's the vCenter Server?
Btw you may want to take a look at http://www.virtuallyghetto.com/2012/08/how-to-enable-nested-esxi-other.html for information about the difference of vhv.allow and vhv.enable. For networking it may also be required to enable promiscuous mode for the port groups to which the virtual ESXi hosts are connected (see http://www.virtuallyghetto.com/2013/11/why-is-promiscuous-mode-forged.html)
André