The follow script is something I wrote to automate the VLAN configuration of our Dell 3448 Switches via telnet. We are currently implementing VLANs for the very first time and I wanted a way to easily deploy the VLAN changes as quickly as possible.

param (
    [string]$SwitchIP = $env:computername,
    [string]$SwitchUser = "",
    [string]$SwitchPassword = "",
    [string]$InputFile = "",
    [int]$Port = 23
)

$Data = Import-Csv -Path $InputFile -Header 'Port', 'Tagged', 'UntaggedOut', 'UntaggedIn'

# All this does is connect and enter the username and password
$TelnetScript = @"
    set oShell = CreateObject("WScript.Shell")`r`n
    oShell.run("telnet")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("open $SwitchIP $Port")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("{Enter}")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("{Enter}")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("$SwitchUser")
    WScript.Sleep 1000`r`n
    oShell.SendKeys("{Enter}")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("$SwitchPassword")
    WScript.Sleep 1000`r`n
    oShell.SendKeys("{Enter}")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("configure")`r`n
    WScript.Sleep 1000`r`n
    oShell.SendKeys("{Enter}")`r`n
    WScript.Sleep 1000`r`n
"@

$Data | Foreach-Object {
    # This gets the correct port and sets it to general mode
    $Object = $_
    $TelnetScript += 'oShell.SendKeys("interface ethernet ' + $Object.Port + '")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
    $TelnetScript += 'WScript.Sleep 1000'+"`r`n";
    $TelnetScript += 'oShell.SendKeys("switchport mode general")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    
    # Sets the allowed tagged VLANs
    $Object.Tagged.Split(',') | Foreach-Object {
        $TelnetScript += 'oShell.SendKeys("switchport general allowed vlan add ' + $_ + ' tagged")'+"`r`n";
        $TelnetScript += "WScript.Sleep 1000`r`n";
        $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
        $TelnetScript += "WScript.Sleep 1000`r`n";
    }
    
    # Sets the outgoing untagged vlan
    $TelnetScript += 'oShell.SendKeys("switchport general allowed vlan add ' + $Object.UntaggedOut + ' untagged")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    
    # Sets the incoming untagged vlan
    $TelnetScript += 'oShell.SendKeys("switchport general pvid ' + $Object.UntaggedIn + '")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    
    # Exit interface command so we can do a diffrent one
    $TelnetScript += 'oShell.SendKeys("exit")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
    $TelnetScript += 'oShell.SendKeys("{Enter}")'+"`r`n";
    $TelnetScript += "WScript.Sleep 1000`r`n";
}

$TelnetScript | Out-File -FilePath .\RunTelnet.vbs -Encoding ASCII;
& .\RunTelnet.vbs

Your CSV File must be in the following format (note that there is NO HEADER!)

<port>	<tagged>	<untaggedOut>	<untaggedIn>
1/e1	200,400,500	400	400
1/e5	400,500	500	500

You must also have the following parameters defined when running the script:
-SwitchIP IP of the Switch
-SwitchUser Username for the admin
-SwitchPassword Password for admin user
-InputFile The CSV File you created
-Port (option) port of the telnet interface