Use vSphere Network I/O Control to allocate network bandwidth to business-critical applications and to resolve situations where several types of traffic compete for common resources. About vSphere Network I/O Control Version 3vSphere Network I/O Control version 3 introduces a mechanism to reserve bandwidth for system traffic based on the capacity of the physical adapters 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.. Upgrade Network I/O Control to Version 3 on a vSphere Distributed SwitchIf you have upgraded a vSphere Distributed Switch to version 6.0.0 without converting Network I/O Control to version 3, you can upgrade Network I/O Control to use the enhanced model for bandwidth allocation to system traffic and to individual virtual machines. Enable Network I/O Control on a vSphere Distributed SwitchEnable network resource management on a vSphere Distributed Switch to guarantee minimum bandwidth to system traffic for vSphere features and to virtual machine traffic. Bandwidth Allocation for System TrafficBased on shares, reservation, and limit, you can configure Network I/O Control to allocate certain amount of bandwidth for traffic generated by vSphere Fault Tolerance, iSCSI storage, vSphere vMotion, and so on. Bandwidth Allocation for Virtual Machine TrafficVersion 3 of Network I/O Control lets you configure bandwidth requirements for individual virtual machines. You can also use network resource pools where you can assign a bandwidth quota from the aggregated reservation for the virtual machine traffic and then allocate bandwidth from the pool to individual virtual machines. Move a Physical Adapter Out the Scope of Network I/O ControlUnder certain conditions you might need to exclude physical adapters with low capacity from the bandwidth allocation model of Network I/O Control version 3. Working with Network I/O Control Version 2On a vSphere Distributed Switch 5.x, and on a vSphere Distributed Switch upgraded to 6.0 that does not have Network I/O Control enhanced to version 3, you can ensure that system traffic and virtual machines receive required bandwidth for their operation by using the resource pool model of Network I/O Control version 2.