Get-CDP or LLDP Info from ESXi/vCenter

Get-CDPorLLDPInfofromESXi.ps1

function Get-CDPorLLDP {
    $myCol = @()
    foreach ($VIServer in $global:DefaultVIServers)
    {
    $vmhosts = Get-VMHost -Server $VIServer | where-object {$_.ConnectionState -eq "Connected" -or "Maintenance"}
    foreach ($vmhost in $vmhosts)
        {
        Write-Host "Collating information for $($VMHost.Name)"
        $networkSystem = Get-view -Server $viserver -Id $vmhost.extensiondata.ConfigManager.NetworkSystem
            foreach($pnic in $networkSystem.NetworkConfig.Pnic)
            {
            $pnicInfo = $networkSystem.QueryNetworkHint($pnic.Device)
                foreach($Hint in $pnicInfo)
                {
                If (($vmhost.extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).LinkSpeed.SpeedMb -ne $null)
                    {
                    $VMhostObject = $VMHost
                    $NetworkInfo = "" | select-Object vCenter, DataCenter, Host, Cluster, vSwitch, PNic, Speed, MAC, DeviceID, MgmtAddress, PortID, VLAN, NativeVLAN
                    $NetworkInfo.vCenter = $VIServer.Name
                    $NetworkInfo.DataCenter = (Get-Datacenter -VMHost $VMhostObject).Name
                    $NetworkInfo.Host = $vmhost.Name
                    #$NetworkInfo.Model = $vmhost.Hardware.SystemInfo.Model
                    $NetworkInfo.Cluster = $vmhostObject.Parent.name
                    $NetworkInfo.vSwitch = $null
                    $NetworkInfo.vSwitch = (Get-Virtualswitch -Server $VIServer -VMHost $VMhostObject -Standard | where-object {$_.Nic -eq ($Hint.Device)}).name
                    If ($NetworkInfo.vSwitch -eq $null) 
                        {
                        $NetworkInfo.vSwitch = (Get-VDSwitch -Server $VIServer -VMHost $VMhostObject | Get-VDPort -Uplink | where-object {$_.ConnectedEntity -match $Hint.Device -and $_.ProxyHost -match $vmhost.Name}).Switch.Name 
                        If ($NetworkInfo.vSwitch -eq $null){$NetworkInfo.vSwitch = "Not Found"}
                        }
                    #Returns LLDP Info if CDP not found    
                    If ($Hint.ConnectedSwitchPort -eq $null -and $Hint.LldpInfo -ne $null) 
                        {
                        $NetworkInfo.PNic = $Hint.Device 
                        $NetworkInfo.DeviceID = ($Hint.LldpInfo.Parameter | where-object {$_.Key -match "System Name"}).Value
                        $NetworkInfo.MgmtAddress = ($Hint.LldpInfo.Parameter | where-object {$_.Key -match "Management Address"}).Value
                        $NetworkInfo.PortID = $Hint.LLDPInfo.PortId
                        $NetworkInfo.VLAN = If ($Hint.Subnet.Count -gt 1){"Trunk"} Elseif ($Hint.Subnet -eq $null) {"VLAN ID Hint not discovered yet"} Else {$Hint.Subnet.vlanid}
                        $NetworkInfo.NativeVLAN = $Hint.LLDPInfo.VLAN
                        $NetworkInfo.Speed = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).LinkSpeed.SpeedMb
                        $NetworkInfo.MAC = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).Mac
                        }
                    #Returns CDP Info if LLDP not found    
                    If ($Hint.ConnectedSwitchPort -ne $null -and $Hint.LldpInfo -eq $null )
                        {
                        $NetworkInfo.PNic = $Hint.Device 
                        $NetworkInfo.DeviceID = $Hint.ConnectedSwitchport.DevId
                        $NetworkInfo.MgmtAddress = $Hint.ConnectedSwitchport.Address
                        $NetworkInfo.PortID = $Hint.ConnectedSwitchPort.PortId
                        $NetworkInfo.VLAN = If ($Hint.Subnet.Count -gt 1){"Trunk"} Elseif ($Hint.Subnet -eq $null) {"VLAN ID Hint not discovered yet"} Else {$Hint.Subnet.vlanid}
                        $NetworkInfo.NativeVLAN = $Hint.ConnectedSwitchPort.VLAN    
                        $NetworkInfo.Speed = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).LinkSpeed.SpeedMb
                        $NetworkInfo.MAC = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).Mac
                            }
                    #Returns info not found in case CDP and LLDP info not found
                    If ($Hint.ConnectedSwitchPort -eq $null -and $Hint.LldpInfo -eq $null )
                            {
                            $NetworkInfo.PNic = $Hint.Device 
                            $NetworkInfo.DeviceID = "LLDP/CDP Info Not Found"
                            $NetworkInfo.MgmtAddress ="LLDP/CDP Info Not Found"
                            $NetworkInfo.PortID = "LLDP/CDP Info Not Found"
                            $NetworkInfo.VLAN = If ($Hint.Subnet.Count -gt 1){"Trunk"} Elseif ($Hint.Subnet -eq $null) {"VLAN ID Hint not discovered yet"} Else {$Hint.Subnet.vlanid}
                            $NetworkInfo.NativeVLAN = "LLDP/CDP Info Not Found" 
                            $NetworkInfo.Speed = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).LinkSpeed.SpeedMb
                            $NetworkInfo.MAC = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).Mac
                            }
                    #Extremely unlikely scenario where both CDP and LLDP info found.
                    If ($Hint.ConnectedSwitchPort -ne $null -and $Hint.LldpInfo -ne $null )
                        {
                        $NetworkInfo.PNic = $Hint.Device 
                        $NetworkInfo.DeviceID = "Ugh, that's weird.  CDP AND LLDP info was found."
                        $NetworkInfo.MgmtAddress = "Ugh, that's weird.  CDP AND LLDP info was found."
                        $NetworkInfo.PortID = "Ugh, that's weird.  CDP AND LLDP info was found."
                        $NetworkInfo.VLAN = If ($Hint.Subnet.Count -gt 1){"Trunk"} Elseif ($Hint.Subnet -eq $null) {"VLAN ID Hint not discovered yet"} Else {$Hint.Subnet.vlanid}
                            $NetworkInfo.Speed = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).LinkSpeed.SpeedMb
                           $NetworkInfo.MAC = ($vmhost.Extensiondata.Config.Network.Pnic | where-object {$_.device -eq $hint.Device}).Mac
                        }
                    If ($NetworkInfo) {$MyCol += $NetworkInfo}
                    }
                }
            }
        }
    }
    $myCol
    }