How to locate a rogue device

Hi! What is the best way of locating an unknown device in a network of (mainly) Mikrotik managed switches? I see the MAC and IP given by the DHCP server. Which is the quickest way to find out the switch port the device is connected? Does the Dude have any functionality for this?

Thanks in advance!

/ip/arp/print
/interface/bridge/host/print

od you can play some music e.g. http://forum.mikrotik.com/t/some-music/95593/1