In VMware vSphere, you can use PowerCLI (PowerShell module for VMware) to manage various aspects of ESXi hosts and virtual infrastructure. To set NIC teaming policies on a vSwitch or port group, you can use the Set-NicTeamingPolicy cmdlet. Here’s an example of how you can use it:

# Connect to your vCenter Server
Connect-VIServer -Server YourVCenterServer -User YourUsername -Password YourPassword

# Get the ESXi host
$ESXiHost = Get-VMHost -Name "YourESXiHostName"

# Get the vSwitch or port group
$vSwitchName = "vSwitch0"           # Specify the name of your vSwitch
$portGroupName = "Management Network"  # Specify the name of your port group

# Retrieve the existing NIC teaming policy
$nicTeamingPolicy = Get-NicTeamingPolicy -VMHost $ESXiHost -VSwitch $vSwitchName -PortGroup $portGroupName

# Modify the NIC teaming policy settings
$nicTeamingPolicy.LoadBalancing = "iphash"  # Set load balancing policy (example: "iphash")
$nicTeamingPolicy.NotifySwitches = $true     # Set switch notification setting

# Apply the modified NIC teaming policy
Set-NicTeamingPolicy -NicTeamingPolicy $nicTeamingPolicy -VMHost $ESXiHost -VSwitch $vSwitchName -PortGroup $portGroupName

# Disconnect from the vCenter Server
Disconnect-VIServer -Server * -Confirm:$false

Remember to replace YourVCenterServer, YourUsername, YourPassword, YourESXiHostName, vSwitch0, and Management Network with your actual vCenter Server details, ESXi host name, vSwitch name, and port group name.

In this script:

1. Connect to the vCenter Server using Connect-VIServer.
2. Get the ESXi host using Get-VMHost.
3. Retrieve the existing NIC teaming policy using Get-NicTeamingPolicy.
4. Modify the NIC teaming policy settings as needed.
5. Apply the modified NIC teaming policy using Set-NicTeamingPolicy.
6. Disconnect from the vCenter Server using Disconnect-VIServer.