Abstract
Transmission impairments in wavelength-division-multiplexing
(WDM) transparent optical networks accumulate along an optical path and determine
the feasibility of lightpaths; hence, the impairments need to be managed efficiently
by the control plane. This paper presents impairment-aware distributed optical
control plane (OCP) based on enhancements to resource reservation protocol–traffic
engineering (RSVP–TE) signaling protocol (S-OCP). In particular, four
architectural options [K-sequential (K-SEQ), K-parallel (K-PAR), hop-by-hop
(HbH), and full flooding (FF)] within the S-OCP approach are defined and compared.
Simulation results show that a combination of HbH routing and feasibility
check can be considered as a good compromise both in terms of blocking probability
and control plane overhead. The feasibility of a signaling-based approach
for the control plane is further demonstrated by comparing simulation results
with the results obtained from the implementation of the proposed architectural
options in a commercial generalized multiprotocol label switching (GMPLS)
protocol emulator. Furthermore, we argue that the real networks will rarely
be homogeneous concerning transponder types, creating the need for a transponder
selection policy at the end nodes. We introduce and compare two policies:
best-first and worst-first. The results obtained from our experiments show
that a worst-first policy for selecting transponders can save up to 50% enhanced
transponders thereby reducing the overall cost.
© 2009 IEEE
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