Detailed study of IP/ reconfigurable optical networks
ABSTRACT IP over reconfigurable optical network architectures have been extensively discussed within the research literature over the past few years. However, although reconfigurable optical networks have been deployed and signaling protocols between IP routers and optical networks have been standardized, large IP backbones are typically deployed using the reconfigurable optical networks. One of the most important criteria in determining whether an IP backbone should be carried over a reconfigurable optical network is economic viability - which necessitates a detailed, accurate economic study of IP backbone over reconfigurable optical network architectures. In this paper, we analyze and explore four IP over optical network architectures for a typical large ISP backbone. In contrast with other published claims, our results suggest that an IP over opaque reconfigurable optical network architecture is not economically attractive with current equipment and IP backbone network design requirements. However, for ISPs also carrying large volumes of transport network private line services, our proposed integrated IP over re-configurable optical network architecture may provide an attractive alternative for providing rapid, cost effective failure recovery.
Conference Paper: Simulated annealing algorithm for virtual network reconfiguration[Show abstract] [Hide abstract]
ABSTRACT: Network virtualization has evoked interest among researchers as a promising solution for developing flexible and manageable architectures for future Internet. One of the major challenges in network virtualization is the efficient allocation of substrate resources to the Virtual Networks (VNs) - a problem known as Virtual Network Embedding (VNE). Most of the past research on VNE has been focused on algorithms to allocate resources to VNs. The problem of reconfiguration, however, is relatively less explored. In this paper, we propose a simulated annealing algorithm for reconfiguring the VNs in order to balance the load across the substrate network, thereby reducing the peak node and link load on the substrate network. Through extensive simulations we evaluate the proposed reconfiguration algorithm and show that after reconfiguration there is a 20% reduction in maximum link load and 5% reduction in maximum node load. The average link load is reduced by 50% and the fraction of links having a load above 50% is reduced from 66% to 14%. We also show that periodic reconfiguration leads to a significant improvement in the acceptance ratio of VN requests.Next Generation Internet (NGI), 2012 8th EURO-NGI Conference on; 01/2012
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ABSTRACT: Integration between Ethernet Passive Optical Network (EPON) and Worldwide Interoperability for Microwave Access (WiMAX) is a promising solution for next generation access networks. In this paper, we devise a new architecture framework for EPON-WiMAX hybrid networks that is more reliable and extend the service coverage range. In addition, we propose a new bandwidth allocation algorithm for the proposed architecture that provides per-stream QoS protection, bandwidth guarantee for real-time flows and improves the overall system performance. Through intensive simulations, we show the effectiveness of the proposed architecture and bandwidth allocation algorithm.Proceedings of the Global Communications Conference, 2010. GLOBECOM 2010, 6-10 December 2010, Miami, Florida, USA; 01/2010
Article: VROOM: Virtual routers on the move[Show abstract] [Hide abstract]
ABSTRACT: Network management is the proverbial "elephant in the room"—the pressing problem we all know is plaguing the Internet, yet seems intractable to solve. Each new man-agement challenge leads to a new point solution, such as a new configuration script, measurement tool, or protocol extension. In this paper, we argue that many network-management problems stem from the same root cause— the need to maintain consistency between the physical and logical configuration of routers. Instead, we believe that future networks should break this tight coupling by al-lowing (virtual) routers to freely move from one physical node to another, without changing the IP-layer topology. Our VROOM (Virtual ROuters On the Move) architecture supports live virtual router migration and re-mapping of virtual links, by capitalizing on recent innovations in pro-grammable transport networks, packet-aware access net-works, virtual server migration and virtual router tech-nologies. Preliminary experiments with a simple proto-type, built using Xen and the Linux routing software, show that VROOM is feasible in practice. We believe that vir-tual router migration will simplify a variety of network-management tasks, including planned maintenance, ser-vice deployment, and minimizing power consumption.ACM SIGCOMM Computer Communication Review 10/2008; · 1.10 Impact Factor