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 for label switching
From The Free On-line Dictionary of Computing (30 December 2018) :

  label switching
      A routing technique that uses information from
     existing IP routing protocols to identify IP datagrams
     with labels and forwards them to a modified switch or
     router, which then uses the labels to switch the datagrams
     through the network.
     Label switching combines the best attributes of data link
     layer (layer two) switching (as in ATM and Frame Relay)
     with the best attributes of network layer (layer three)
     routing (as in IP).
     Prior to the formation of the MPLS Working Group in 1997, a
     number of vendors had announced and/or implemented proprietary
     label switching.

Contact=webmaster@dict.org Specification=RFC 2229