Abstract
Wavelength-routed networks are viewed as less flexible than IP-routed networks
because of the dedicated nature of optical path and incurred optical layer
constraints, e.g., wavelength continuity constraints. However, current
wavelength-routed networks operating in the WDM environment are empowered with the
potential of dynamic and fast provisioning of high-bandwidth optical paths. This
potential is currently being addressed by intelligent traffic engineering (TE) on
multilayer networks that combine both a broadband optical layer and a
grooming-capable electronic layer. We propose a dynamic TE scheme within the
framework of multilayer generalized multiprotocol label switching (GMPLS), which
takes into consideration the simple nature of an all-optical (OOO) path, the
flexibility and grooming efficiency of optical-electrical-optical (OEO) connection,
and the support of traffic quality of service (QoS). It optimizes the utilization of
OOO and OEO connections in a hybrid fashion through the concept of lightpath
tunneling that can adapt to real-time traffic demands. Simulations based on this TE
scheme show that the optical transceiver requirement it core nodes can be reduced to
only ~20% of that of the IP-routed networks without sacrificing performance. This TE
scheme can also be adapted to network scenarios where very limited numbers of
transceivers are deployed.
© 2005 Optical Society of America
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