Stabilizing deflection routing in optical burst switched networks

Andrew Zalesky, Hai L. Vu, Zvi Rosberg, Eric W.M. Wong, Moshe Zukerman

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


This paper studies the blocking performance of optical burst switching (OBS) networks using a sequential office control (SOC) state-independent deflection routing policy. We show that unprotected deflection routing may destabilize OBS resulting in higher blocking probabilities than if bursts were not deflected but simply blocked. This study was motivated by the well-known destabilizing effect that alternative routing has on circuit switching in classical telephony networks. We propose two forms of protection to guard against destabilization: 1) wavelength reservation, which is analogous to trunk reservation in circuit switching; and, 2) preemptive priority, which is a new form of protection where bursts that have not been deflected are given preemptive priority over bursts that have been deflected. Our main contribution is a onemoment reduced-load approximation to evaluate the blocking performance of OBS networks using deflection routing protected by either wavelength reservation or preemptive priority. Our reduced-load approximation relies on the usual assumptions of link independence and Poisson distributed link arrivals. We quantify the error admitted in making these two assumptions via simulation. Using our reduced-load approximation, we evaluate the blocking performance of protected and unprotected deflection routing in several randomly generated networks. The chief conclusion of our study is that deflection routing in OBS should be given some form of protection to avoid destabilization resulting from upward load variations, and in terms of blocking performance, preemptive priority is the best form of protection for OBS. We use simulation to verify that our conclusions remain valid for a realistic traffic scenario.

Original languageEnglish
Article number25606
Pages (from-to)3-19
Number of pages17
JournalIEEE Journal on Selected Areas in Communications
Issue number6
StatePublished - 1 Jan 2007
Externally publishedYes


  • Deflection routing
  • Optical burst switching
  • Preemptive priority
  • Reduced-load approximation
  • Stability
  • Wavelength reservation

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Stabilizing deflection routing in optical burst switched networks'. Together they form a unique fingerprint.

Cite this