How to change the link state of physical interface on vSphere 5
Change the link state from the Management Network vmkernel:
Log in to the ESXi 5.0 host using Tech Support Mode with root account privilege.
Change the link state of the uplink vmnic with one of these commands:
esxcli network nic down -n vmnicX<br /> esxcli network nic up -n vmnicX
Where X is the vmnic number (for example vmnic0, vmnic1 …)