An Experimental Signalling Enhancement to Efficiently Encompass WCC and Backup Sharing in GMPLS-Enabled Wavelength-Routed Networks

In this paper we propose novel wavelength assignment algorithms along with the required extensions to the current GMPLS RSVP-TE Label Set to efficiently encompass the Wavelength Continuity Constraint (WCC) and the Backup Sharing in GMPLS-enabled Wavelength-Routed Networks (WRN) with Shared Path Protection (SPP) recovery schemes. The focus of this paper is to experimentally validate in ADRENALINE testbed the proposed signalling-based solution for WCC in SPP recovery when GMPLS OSPF-TE routing protocol disseminates only aggregated link information at bandwidth level based on two approaches: Unreserved Bandwidth (UBw), as proposed in standard GMPLS, and Shamble Bandwidth (SRBw) through an extended GMPLS OSPF-TE protocol proposed by the authors. Experimental performance evaluation shows that without using full routing information (i.e., per-wavelength channel dissemination), the Resource Overbuild can be reduced up to 25% and the Blocking Probability up to 35%. Moreover, in function of the required performance, it is preferable to enhance the signalling with sharing information before adding it into the routing.