A Novel PCE-based Architecture of Multi-region and Multi-layer GMPLS/ ASON Networks

With the development of large-scale, multi-region and multi-layer networks,policybased and constraint-based path computation is more and more complicated and dynamic routing becomes one of the key issues in GMPLS/ASON networks.To combine the advantages of both GMPLS control plane and PCE,novel dual routing engine architecture of multi-layer and multi-region scalable optical networks is proposed in this paper. The collaboration of group engine and unit engine makes it effective to optimize path computation especially under the condition of complex multiconstraints.The functional architecture of dual routing engine is detailed.Different potential cooperation relationships between group engine and unit engine are investigated and simulation results for multi-region and multi-layer routing schemes are analyzed.