Differentiated QoS routing in GMPLS-based IP/WDM networks

Integrated IP over wavelength division multiplexed (WDM) networks with generalized multi-protocol label switching (GMPLS) control and management capabilities are a promising candidate for the next generation optical Internet networks. By using a unified control plane, such networks make more efficient usage of network resources both at the IP layer and the WDM optical layer. In our work, we consider prioritized routing of bandwidth-guaranteed label switched paths (LSPs) providing service differentiation between classes of high and normal priority traffic. The QoS delay requirements are assumed to be translated into bandwidth and opto-electronic-opto (o-e-o) conversion requirements. We develop a graphical representation of the integrated network state which is different from other conventional graphical representations in that it models the cost of usage of ports and o-e-o conversions in addition to the usage of wavelength and bandwidth resources. We then develop a threshold-protection-based routing algorithm which admits high-priority LSPs in preference over normal-priority LSPs and satisfies the bandwidth and o-e-o constraint requirements. Through extensive simulation experiments, we demonstrate the service differentiation and effectiveness of our algorithm.