Explanation/Reference:
Explanation:
To manage the networking of your vSphere environment by using a vSphere Distributed Switch, you must associate hosts with the switch. You connect the physical NICs, VMkernel adapters, and virtual machine network adapters of the hosts to the distributed switch.
Prerequisites
Verify that enough uplinks are available on the distributed switch to assign to the physical NICs that you

want to connect to the switch.
Verify that there is at least one distributed port group on the distributed switch.

Verify that the distributed port group have active uplinks configured in its teaming and failover policy.

Reference: https://pubs.vmware.com/vsphere-60/index.jsp?topic=%
2Fcom.vmware.vsphere.networking.doc%2FGUID-E90C1B0D-82CB-4A3D-BE1B-0FDCD6575725.html