Photonic Network Communications

, Volume 18, Issue 2, pp 150–159 | Cite as

Multilayer traffic engineering for multiservice environments

  • Bart Puype
  • Didier Colle
  • Mario Pickavet
  • Piet Demeester


Multilayer traffic engineering (MLTE) serves to provide cross-layer online network optimization techniques to cope with rapid variations and short-term evolutions in traffic patterns. MLTE extends traffic engineering as it exists in IP/MPLS-based technology toward the multilayer IP/MPLS-over-optical transport network. In addition to the IP/MPLS traffic routing, MLTE exposes much larger adaptation flexibility by building on next-generation automatic switched optical transport networks. These offer fast setup and teardown of end-to-end multi-hop optical connections (lightpaths), which are offered to the IP/MPLS layer as dynamically provisioned capacity. This dynamic nature leads to an IP/MPLS logical topology that can be reconfigured on the fly, and IP/MPLS link capacity that can be up- or downgraded as client traffic demand varies. These MLTE techniques are generally used to increase perceived network performance in terms of throughput or QoS. As such, a MLTE-managed network offers a better than best-effort service. Many types of traditional and novel services are shifting toward IP/MPLS technology. Consequentially, MLTE algorithms and strategies should be conceived with the characteristics of such services in mind. We present a MLTE strategy that can be implemented in a robust and distributed way. This strategy is then taken as the starting point in a study which evaluates its suitability to such services. We show how the strategy can be adapted considering service performance metrics such as end-to-end delay, traffic loss, and routing stability, and how such service optimizations impact general MLTE objectives such as IP/MPLS logical topology mesh size reduction.


Traffic engineering Multilayer networks Service provisioning 


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Bart Puype
    • 1
  • Didier Colle
    • 1
  • Mario Pickavet
    • 1
  • Piet Demeester
    • 1
  1. 1.Department of Information TechnologyGhent University – IBBT – IMECGentBelgium

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