param($switch, $username, $password)

$ip = (Test-Connection -ComputerName (hostname) -Count 1  | Select IPV4Address).IPV4Address.IPAddressToString
[string]$output = plink -ssh $switch -l $username -pw $password "sh ip arp $ip"
$output -match '([0-9]|[a-z]){4}\.([0-9]|[a-z]){4}\.([0-9]|[a-z]){4}'
$mac = $matches[0]
[string]$output = plink -ssh $switch -l $username -pw $password "sh mac address-table address $mac"
$output -match '\w{2}\d\/(\d\/\d|\d)'

Write-Host $matches[0]