Abstract
We present what we believe to be a new fault-tolerant path-protection scheme,
FTPP, for WDM mesh networks based on the alarming state of network nodes and links.
Our extensive simulation results show that FTPP outperforms known path-protection
schemes in terms of loss-of-service ratio and network throughput. The simulation
tests used a wide range of values for the load intensity, the failure arrival rate,
and the failure holding time. The effectiveness of our method has been demonstrated
with the U.S. long-haul and the NSFNET topologies. We next extend the FTPP scheme to
the differentiated services model and evaluate its connection blocking performance.
We introduce a quality-of-service- (QoS-) enhanced FTPP (QEFTPP) routing and
path-protection scheme in WDM networks. QEFTPP uses preemption to minimize the
connection blocking percentage for high-priority traffic. Extensive simulation
results show that QEFTPP can achieve a clear QoS differentiation among the traffic
classes and at the same time provide good overall network performance.
© 2005 Optical Society of America
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