To change the link state of the physical interface ESXi Command Line

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To change the link state of the physical interface from the Management Network vmkernel:
Note: Only cards running auto-negotiation/10Mb/100Mb/1000Mb/10000Mb speeds are supported.
  1. Log in to the ESXi 5.0 host using Tech Support Mode with root account privilege. For more information, see Using Tech Support Mode in ESXi 4.1 and ESXi 5.x (1017910).
  2. Change the link status of the uplink vmnic with one of these commands:

    esxcli network nic down -n vmnicX

    esxcli network nic up -n vmnicX

    Where X is the vmnic number (for example,vmnic0)