Label Switching Router

from The Free On-line Dictionary of Computing (8 July 2008)

Label Switching Router

   <networking> (LSR) A device that typically resides somewhere
   in the middle of a {network} and is capable of forwarding
   {datagrams} by {label switching}.  In many cases, especially
   early versions of {MPLS} networks, a LSR will typically be a
   modified {ATM} {switch} that forwards datagrams based upon a
   label in the {VPI}/{VCI} field.

   (1999-06-14)