2011 has been a prolific year for the participants in the GEYSERS project, and the hard work has been rewarded through the publication of several papers. In this blog post I will give an overview of these achievements.
The paper titled “GEYSERS: a novel architecture for virtualization and co-provisioning of dynamic optical networks and IT services”  was published at Future Network and Mobile Summit 2011. It presented the GEYSERS architecture, which was designed to meet some of the challenges faced by the Network of the Future in order to provide scalability, high bandwidth connectivity, convergent IT and network services, resources virtualisation, and automated and energy-efficient provision of network and IT resources. To achieve these goals, the GEYSERS architecture adopts a layered structure, formed of the following components:
- The Physical Infrastructure, consisting of optical network and IT resources,
- The Logical Infrastructure Composition Layer (LICL), which is responsible for the creation and maintenance of Virtual Infrastructures (VIs),
- Network+IT Control Plane (NCP+), which controls the created VIs,
- Service Middleware Layer (SML), which coordinates the management of IT resources that belong to an aggregate service.
The fact that Information and Communication Technology accounts for 4% of the energy consumption worldwide , coupled with the increased energy consumption of both IT and network resources, has led to an increased interest in energy efficient networking . Therefore, GEYSERS addresses this issue as well. The paper “Energy efficiency in integrated IT and optical network infrastructures: the GEYSERS approach”  was published at IEEE INFOCOM Workshop on Green Communications. The paper focuses on two dimensions of the problem, energy aware VI planning, and energy aware service provisioning over VIs. The first case is formulated with Mixed Integer Linear Programming with the goal to jointly minimize the total energy consumption of optical network components (WDM transponders, amplifiers, switches, IT resources). In the second case, an energy efficient routing algorithm is proposed, to provision IT services that originate from specific sites, and that should be executed by suitable IT resources.
This work has been extended in “Energy Efficiency Considerations in Integrated IT and Optical Network Resilient Infrastructures” , which was an invited paper at the 13th International Conference on Transparent Optical Networks (ICTON) 2011. In this paper, it was proposed a modelling approach for the planning of resilient VIs, formed over an integrated IT and optical network infrastructure. In particular, if the primary resource fails, the demands are forwarded to a secondary resource, while if a primary optical link fails, the demands are routed through a secondary path. The problem was formulated with Integral Linear Programming (ILP), with the objective to minimize the total cost of the resulting network configuration. In this case, the cost refers to two components: 1) the cost of the capacity of a physical infrastructure link, and 2) the energy consumption for processing the wavelengths in the IT server. The modelling results show significant energy savings of the proposed solution by jointly optimizing the allocation of both network and IT resources.
Furthermore, there are two papers, out of which one has already been accepted for publication during this year, at TNC 2012, and the other one is still under submission.
The TNC paper, “Logical Infrastructure Composition Layer, the GEYSERS holistic approach for Infrastructure Virtualisation” , will describe the LICL concepts in further detail, with a focus on Future Internet infrastructure management, in the context of the GEYSERS ecosystem. It will present the different service lifecycles and life times for the VI resources, and it will discuss the Information Modelling Framework used by LICL to semantically describe the resources.
The second paper, “Optimal Allocation of Virtual Optical Networks for the Future Internet” , analyses the impact that different transport technologies have on the characteristics of the virtual instances that could be built over a single physical infrastructure. For more details, we invite the reader to check the final papers, once they will be published.
This post was written by Steluta Gheorghiu
 Escalona, E.; Peng, S.; Nejabati, R.; Simeonidou, D.; García-Espín, J. A.; Ferrer, J.; Figuerola, S.; Landi, G.; Ciulli, N.; Jimenez, J.; Belter, B.; Demchenko, Y.; de Laat, C.; Chen, X.; Yukan, A.; Soudan, S.; Vicat-Blanc, P.; Buysse, J.; De Leenheer, M.; Develder, C.; Tzanakaki, A.; Robinson, P.; Brogle, M. & Bohnert, T. M. “GEYSERS: a novel architecture for virtualization and co-provisioning of dynamic optical networks and IT services”. Future Network and Mobile Summit 2011
 Tzanakaki, A.; Anastasopoulos, M.; Georgakilas, K.; Buysse, J.; De Leenheer, M.; Develder, C.; Peng, S.; Nejabati, R.; Escalona, E.; Simeonidou, D.; Ciulli, N.; Landi, G.; Brogle, M.; Manfredi, A.; Lopez, E.; Ferrer Riera, J.; García-Espín, J.; Donaldio, P.; Parladori, G. & Jimenez, J. “Energy efficiency in integrated IT and optical network infrastructures: the GEYSERS approach”, IEEE INFOCOM Workshop on Green Communications 2011
 Tzanakaki, A.; Anastasopoulos, M.; Georgakilas, K.; Buysse, J.; De Leenheer, M.; Develder, C.; Peng, S.; Nejabati, R.; Escalona, E.; Simeonidou, D.; Ciulli, N.; Landi, G.; Brogle, M.; Manfredi, A.; López, E.; Ferrer Riera, J.; Garcia-Espin, J. A.; Figuerola, S.; Donadio, P.; Parladori, G. & Jiménez, J. “Energy Efficiency Considerations in Integrated IT and Optical Network Resilient Infrastructures” (invited), 13th International Conference on Transparent Optical Networks (ICTON) 2011
 Joan A. García-Espín, Jordi Ferrer Riera, Mattijs Ghijsen, Jens Buysse, Sergi Figuerola. “Logical Infrastructure Composition Layer, the GEYSERS holistic approach for Infrastructure Virtualisation”, TNC 2012
 Albert Pagès, Jordi Perelló, Salvatore Spadaro, Joan A. García-Espín, Jordi Ferrer Riera, Sergi Figuerola. “Optimal Allocation of Virtual Optical Networks for the Future Internet”, under submission.
 M. Pickavet et al., “Worldwide energy needs for ICT: The rise of power aware networking”, in Proc. IEEE ANTS, pp. 1-3, Dec. 2008.
 J. Baliga et al., “Energy Consumption in Optical IP Networks”, Journal of Lightwave Technology, Vol. 27, No. 13, July 1, 2009.