Pull an inventory of all ESXi VTEP virtual interfaces from all connected vCenter Servers

Get-VMHostVtepInterface.ps1

function Get-VMHostVtepInterface {

<#
.SYNOPSIS
    Gather VTEP interface inventory from all ESXi hosts
.DESCRIPTION
    Gather VTEP interface inventory from all ESXi hosts.

    This function was written with scale and speed in mind. It pull a host inventory using API calls and then unrolls API properties and
    assigned them to a PSCustomObject.
.OUTPUTS
    [System.Management.Automation.PSCustomObject]
.NOTES
    Author: Kevin Kirkpatrick
    URL: https://github.com/vScripter
    Email: Kevin(at)vmotioned(dot)com
    Version: 1.0
    Updated: 8/10/16
    Update Notes: 8/10/16
#>

    [OutputType([System.Management.Automation.PSCustomObject])]
    [CmdletBinding()]
    param()

    BEGIN {

        Write-Verbose -Message "[Get-VMHostVtepInterface] Gathering VMHost Inventory"
        try {

            $vmHostInventory = $null
            $vmHostInventory = Get-View -ViewType HostSystem -Property Name,Config -ErrorAction 'Stop'

        } catch {

            throw "[Get-VMHostVtepInterface][ERROR] Could not gather VMHost inventory using 'Get-View'. $_"

        } # end try/catch

    } # end BEGIN block

    PROCESS {

        foreach ($vmHost in $vmHostInventory) {
           
            $vtepInterfaceQuery = $null   
            $vtepInterfaceQuery = $vmHost.Config.Network.Vnic | Where-Object {$_.Spec.NetStackInstanceKey -eq 'vxlan'}

            $vmHostName = $null
            $vmHostName = $vmHost.Name

            [uri]$vCenter = $null
            $vCenter = $vmHost.Client.ServiceUrl

            Write-Verbose -Message "[Get-VMHostVtepInterface] Gathering VTEP VMkernel Interfaces for host {$vmHostName}"

            foreach ($vtep in $vtepInterfaceQuery) {

                $objVtepInt = @()
                $objVtepInt = [PSCustomObject] @{
                    VMHost       = $vmHostName
                    Interface    = $vtep.Device
                    MacAddress   = $vtep.Spec.Mac
                    IPv4Address  = $vtep.Spec.Ip.IpAddress
                    SubnetMask   = $vtep.Spec.Ip.SubnetMask
                    DHCP         = $vtep.Spec.Ip.Dhcp
                    MTU          = $vtep.Spec.Mtu
                    TsoEnabled   = $vtep.Spec.TsoEnabled
                    NetworkStack = $vtep.Spec.NetStackInstanceKey
                    PinnedPnic   = $vtep.Spec.PinnedPnic
                    vCenter      = $vCenter.Host
                } # end $objVtepInt

                $objVtepInt

            } # end foreach $vtep

        } # end foreach $vmHost

    } # end PROCESS block

    END {

        Write-Verbose -Message "[Get-VMHostVtepInterface] Processing complete"

    } # end END block

} # end function Get-VMHostVtepInterface