Towards the maximum resource sharing degree for survivable IP/MPLS over WDM mesh networks

In this paper, we study on how to maximize the resource sharing degree for survivable IP/MPLS over Wavelength Division Multiplexing (WDM) mesh networks using lightpath protection and LSP protection. To improve the resource utilization for survivable two-layer mesh networks, previous researchers focus on intra-layer/inter-layer backup resource sharing. First, we propose Inter-Layer Mixed Resource Sharing (ILMRS) scheme. The ILMRS scheme allows Backup LSP Sharing Working Lightpath (i.e., BLSWL) and Working LSP Sharing Backup Lightpath (i.e., WLSBL) when the corresponding constraints can be satisfied. Next, to efficiently facilitate the proposed scheme, a new auxiliary graph approach is proposed that adds Mixed Sharing Wavelength Edge (MSWE) compared to the traditional approaches. We compare three resource sharing schemes for survivable IP/MPLS over WDM mesh networks: the Single-Layer Backup Resource Sharing (SLBRS) which means only backup resource on the same layer can be shared; the Inter-Layer Backup Resource Sharing (ILBRS) which means inter-layer backup resource can be shared; and our proposed ILMRS. Numerical results for a variety of carrier network topologies show that the ILMRS outperform the SLBRS and the ILBRS.