Provisioning, Recovery, and In-Operation Planning in Elastic Optical Networks

12 Recovery in Multilayer Networks

Alberto Castro¹, Lluís Gifre², Ricardo Martínez³, Marc Ruiz² and Luis Velasco²

¹ University California Davis, Davis, CA, USA

² Universitat Politècnica de Catalunya, Barcelona, Spain

³ Centre Tecnològic de Telecomunicacions de Catalunya, Castelldefels, Spain

In multilayer networks, an optical link failure may cause the disruption of multiple aggregated Multi‐Protocol Label Switching (MPLS) Label Switched Paths (LSPs). Thereby, efficient recovery schemes, such as multilayer restoration and survivable virtual network topology (VNT) design, are required.

Regarding restoration, we focus on multilayer MPLS‐over‐EON (Multi‐Protocol Label Switching over Elastic Optical Networks) operated with a Generalized Multi‐Protocol Label Switching (GMPLS) control plane, where a centralized Path Computation Element (PCE) is in charge of computing the route of MPLS connection requests. In the event of a failure, the PCE sequentially computes backup paths for the set of failed MPLS paths. Since the Traffic Engineering Database (TED) in the PCE is not updated until an LSP is actually set up, it is very likely that the PCE assigns the same network resources to different backup paths. To improve this, we propose the DYNamic restorAtion in Multilayer MPLS‐over‐EON (DYNAMO) problem to compute the restoration routes for all the affected MPLS paths together, while taking advantage of sliceable bandwidth variable transponders (SBVTs) to provide additional flexibility ...