Bidirectional path setup scheme using on upstream label set in optical GMPLS networks

Eiji Oki, Nobuaki Matsuura, Kohei Shiomoto, Naoaki Yamanaka

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Generalized Multi-Protocol Label Switching (GMPLS) is being developed in the Internet Engineering Task Force (ffiTF). In GMPLS-based wavelength-division- multiplexing (WDM) optical networks, a wavelength in a fiber is used as a label. In the existing GMPLS signaling protocol for bidirectional paths in WDM networks with the wavelength continuity constraint, bidirectional path setup fails with high probability because the upstream label allocated by the previous hop node may not be accepted at the transit node. To solve this problem, this paper proposes an efficient bidirectional label switched path (LSP) setup scheme based on an upstream label set. Called the Upstream Label Set (ULS) scheme, it is an extension of the existing GMPLS signaling protocol. The ULS scheme is consistent with the existing GMPLS signaling procedure and so offers backward compatibility. The numerical results suggest that when the number of the LSP setup retries is limited, the ULS scheme offers lower blocking probability than the existing GMPLS signaling scheme which uses only with the upstream label (UL). In addition, under the condition that the constraint of the number of LSP setup retries is relaxed, the LSP setup time of the ULS scheme is faster than that of the existing scheme. Furthermore, by using our developed prototype of the GMPLS control system, in which the ULS scheme was installed, we demonstrated that the ULS scheme successfully setup bidirectional LSPs.

Original languageEnglish
Pages (from-to)1569-1576
Number of pages8
JournalIEICE Transactions on Communications
Issue number6
Publication statusPublished - 2004 Jun
Externally publishedYes


  • Bidirectional path
  • Label set
  • Optical network
  • RSVP signaling
  • WDM

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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