###assumptions: you have the right commands to locate the MAC on a switch, example below for cisco, you have a txt doc that lists the IPs/Hostnames of your switches, the MAC is actually live and connected in the environment...###

$macaddy = Read-Host "Enter mac address in 1234.abcd.1234 format: "

[String[]]$Commands = @("***checkcommands***","en","***checkcommands***","terminal length 0","show mac address-table address $macaddy","exit")

###check that these commands do what you expect first, then script

$Port = "23"

$WaitTime = 500

CLS

Write-Host ""

Write-Host ""

Write-Host ""

Write-Host ""

Write-Host ""

Write-Host ""

$ErrorActionPreference= 'silentlycontinue'

Clear-Variable $switches -Scope Global

Clear-Variable $result -Scope Global

Clear-Variable $check -Scope Global

$switches = Get-Content \\sever.domain.edu\share$\scripts\switches.txt

##############relies on having a txt doc that lists the IP’s of your switches

Foreach ($remotehost in $switches)

{

Write-Progress -activity "Searching..."

Clear-Variable $result -Scope Global

$Socket = New-Object System.Net.Sockets.TcpClient($RemoteHost, $Port)

If ($Socket)

{  

$Stream = $Socket.GetStream()

    $Writer = New-Object System.IO.StreamWriter($Stream)

    $Buffer = New-Object System.Byte[] 1024

    $Encoding = New-Object System.Text.AsciiEncoding

    ForEach ($Command in $Commands)

    {   $Writer.WriteLine($command)

        $Writer.Flush()

        Start-Sleep -Milliseconds $WaitTime

    }

    Start-Sleep -Milliseconds ($WaitTime * 4)

    While($Stream.DataAvailable)

    {   $Read = $Stream.Read($Buffer, 0, 1024)

        $Result = ($Encoding.GetString($Buffer, 0, $Read))

        $Result += [string]::concat($Result,",")

     }

$check.success=$false

$check = $result -match 'DYNAMIC'

####trigger word, check manually that this makes sense for your environment

####note any devices routing the mac will show up, including switches trunking the traffic etc

if($check)

{

write-host ""

write-host "**** Located $macaddy on $remotehost ****"

write-host ""

Clear-Variable $result -Scope Global}

}

Else

{   write-host "Unable to connect to host: $RemoteHost...."

}

}