A Comparison of Approaches for Traffic Engineering in IP and MPLS   Networks
  As IP / MPLS network service providers drive for improved network efficiencies, traffic engineering is becoming increasingly important. In this article we review the approaches for traffic engineering in IP / MPLS networks and present the result of a study, which compares their performance in operational networks 
Alan Gous, Arash Afrakhteh, John Evans
cs.NI