<#
Required parameter:
-SwitchName   Name of the existing standard vSwitch where the port groups will be created.

Optional parameter:
-BaseVlanId   Starting VLAN ID. Default is 100.
              The script creates:
              HQ-SERVER-Linux = BaseVlanId
              HQ-DMZ-Linux = BaseVlanId + 1
              HQ-CLIENT-Linux = BaseVlanId + 2
              INET-HQ-Linux = BaseVlanId + 3
              INET-BRANCH-Linux = BaseVlanId + 4
              HOME-Linux = BaseVlanId + 5
              BR-SERVER-Linux = BaseVlanId + 6
              BR-CLIENT-Linux = BaseVlanId + 7

Example:
.\Create-PortGroups.ps1 -SwitchName vSwitch0
#>
[CmdletBinding()]
param(
    [Parameter(Mandatory = $true)]
    [string]$SwitchName,

    [ValidateRange(1, 4087)]
    [int]$BaseVlanId = 100
)

$ErrorActionPreference = 'Stop'

$switch = Get-VirtualSwitch -Name $SwitchName -ErrorAction Stop

$portGroups = @(
    @{ Name = 'HQ-SERVER-Linux'; VlanId = $BaseVlanId },
    @{ Name = 'HQ-DMZ-Linux'; VlanId = $BaseVlanId + 1 },
    @{ Name = 'HQ-CLIENT-Linux'; VlanId = $BaseVlanId + 2 },
    @{ Name = 'INET-HQ-Linux'; VlanId = $BaseVlanId + 3 },
    @{ Name = 'INET-BRANCH-Linux'; VlanId = $BaseVlanId + 4 },
    @{ Name = 'HOME-Linux'; VlanId = $BaseVlanId + 5 },
    @{ Name = 'BR-SERVER-Linux'; VlanId = $BaseVlanId + 6 },
    @{ Name = 'BR-CLIENT-Linux'; VlanId = $BaseVlanId + 7 }
)

foreach ($portGroup in $portGroups) {
    $existing = Get-VirtualPortGroup -VirtualSwitch $switch -Name $portGroup.Name -ErrorAction SilentlyContinue

    if ($existing) {
        if ($existing.VLanId -ne $portGroup.VlanId) {
            Set-VirtualPortGroup -VirtualPortGroup $existing -VLanId $portGroup.VlanId | Out-Null
            Write-Host "Updated $($portGroup.Name) VLAN to $($portGroup.VlanId)"
        }
        else {
            Write-Host "$($portGroup.Name) already exists"
        }

        continue
    }

    New-VirtualPortGroup -VirtualSwitch $switch -Name $portGroup.Name -VLanId $portGroup.VlanId | Out-Null
    Write-Host "Created $($portGroup.Name) with VLAN $($portGroup.VlanId)"
}