Dynamic multilayer routing schemes in GMPLS-based IP+optical networks

Eiji Oki, Kohei Shiomoto, Daisaku Shimazaki, Naoaki Yamanaka, Wataru Imajuku, Yoshihiro Takigawa

Research output: Contribution to journalArticlepeer-review

122 Citations (Scopus)


This article presents two dynamic multilayer routing policies implemented in the photonic MPLS router developed by NTT for IP+optical generalized MPLS networks. According to IP traffic requests, wavelength paths called lambda label switched paths are set up and released in a distributed manner based on GMPLS routing and signaling protocols. Both dynamic routing policies first try to allocate a newly requested electrical path to an existing optical path that directly connects the source and destination nodes. If such a path is not available, the two policies employ different procedures. Policy 1 tries to find available existing optical paths with two or more hops that connect the source and destination nodes. Policy 2 tries to establish a new one-hop optical path between source and destination nodes. The performances of the two routing policies are evaluated. Simulation results suggest that policy 2 outperforms policy 1 if p is large, where p is the number of packet-switching-capable ports; the reverse is true only if p is small. We observe that p is the key factor in choosing the most appropriate routing policy. We also describe items that need to be standardized in the IETF to effectively achieve multilayer traffic engineering.

Original languageEnglish
Pages (from-to)108-114
Number of pages7
JournalIEEE Communications Magazine
Issue number1
Publication statusPublished - 2005 Jan

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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