Switch between VLANs with Hyper-V vEthernet

switch-vlan.ps1

<#
    Make adapter use gravity (untagged) or upstream network (tagged 1).

    This depends on the switch (ER-X) configuration:
    - upstream port has PVID=1 (untagged vlan 1)
    - gateway port has PVID=1 VID=200 (untagged vlan 1, tagged vlan 200)
    - downstream ports have PVID=200 VID=1 (untagged vlan 200, tagged vlan 1)
#>

#Requires -RunAsAdministrator
param (
    [Parameter(HelpMessage="Name of bridged switch")]
    [string]$VmSwitch = "Bridged Switch",

    [Parameter(Mandatory, HelpMessage="Skip gravity")]
    [boolean]$SkipGravity = $false
)

$vmAdapter = Get-VMNetworkAdapter -ManagementOS -SwitchName $VmSwitch

if ($SkipGravity) {
    Write-Host "Joining upstream VLAN..."
    Set-VMNetworkAdapterVlan -Access -VlanId 1 $vmAdapter
} else {
    Write-Host "Joining Gravity VLAN..."
    Set-VMNetworkAdapterVlan -Untagged $vmAdapter
}

$adapter = Get-NetAdapter -Name "vEthernet ($vmSwitch)"

Write-Host "Resetting network adapter..."
Disable-NetAdapter -InputObject $adapter -Confirm:$false
Enable-NetAdapter -InputObject $adapter -Confirm:$false

Write-Host "Done!"