Title: INTER-LAYER SHARING OF BACKUP PATH CAPACITIES PROVIDING FAST SERVICE RECOVERY IN IP-MPLS/WDM NETWORKS

Year of Publication: 2013
Page Numbers: 134-148
Authors: Wojciech Molisz, Jacek Rak
Conference Name: The Third International Conference on Digital Information Processing and Communications (ICDIPC2013)
- United Arab Emirates

Abstract:


In this paper, we investigate the issue of providing the transmission continuity in IP-MPLS/WDM networks in the presence of failures of nodes/links. Special focus is put on assuring fast restoration of flows affected after a failure in a scenario assuming sharing the backup path capacities in order to decrease the overall bandwidth consumption. In particular, we propose a new approach to inter-layer sharing of link capacity reserved for backup paths that does not increase the length of backup paths. It is thus able to provide the smallest possible values of service recovery time. Proposed solution is dedicated to the case of multiple classes of service suitable for differentiated requirements of end-users. We showed in extensive simulations that our approach leads to significant savings in service restoration time (up to 33% smaller values compared to the common approach to inter-layer backup capacity sharing) and backup paths capacity required to provide the survivable routing (up to 54%). To the best of authors’ knowledge, the proposed method to inter-layer sharing of link capacity is the first one that does not increase the length of backup paths.