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Explaining NIOC capabilities
Starting with vSphere 6.0, the new NIOC v3 introduces a mechanism to reserve bandwidth for system traffic based on the capacity of the physical NICs on a host. It enables fine-grained resource control at the VM network adapter level similar to the model that you use for allocating CPU and memory resources.
If you have upgraded a vDS to version 6.0.0 without converting NIOC to version 3, you can upgrade NIOC to use the enhanced model for bandwidth allocation to system traffic and to individual virtual machines:
vSphere Network I/O Control vSphere Distributed Switch Version ESXi Version
2.0
5.1 5.1, 5.5, 6.0, 6.5
5.5 5.5, 6.0, 6.5
3.0
6.0 6.0, 6.5
6.5 6.5
Table 2.5: NIOC versions
For more information, see the vSphere 6.5 Networking guide (https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-98E0B3C2-52A7-4CAB-A839-4DA82A9F6D3A.html).