Mohamed O. I. Musa

Routing post-disaster traffic floods in optical core networks

The increasing number of disasters around the world calls for a new direction in building the networks; this direction is known as disaster-resilient networks. In this paper, we consider the effect of post-disaster traffic on the core network performance. We evaluate the network blocking during single node flooding with different flood sizes. Then we study four mitigation approaches to maximally serve the traffic floods using the excess capacity, traffic filtering, rerouting and Differentiated-Services. The results show that the studied approaches reduce blocking by 50% in the worst cases.

Server-centric PON data center architecture

Over the last decade, the evolution of data center architecture designs has been mainly driven by the ever increasing bandwidth demands, high power consumption and cost. With all these in mind, a significant potential to improve bandwidth capacity and reduce power consumption and cost can be achieved by introducing PONs in the design of the networking fabric infrastructure in data centers. This work presents a novel server-centric PON design for future cloud data center architecture. We avoided the use of power hungry devices such as switches and tuneable lasers and encouraged the use of low power passive optical backplanes and PONs to facilitate intra and inter rack communication. We also tackle the problem of resource provisioning optimization and present our MILP model results for energy efficient routing and resource provisioning within the PON cell. We optimized the selection of hosting servers, routing paths and relay servers to achieve efficient resource utilization reaching 95% and optimum saving in energy consumption reaching 59%.

Energy-Efficient Traffic Scheduling in IP over WDM Networks

In this paper, we investigate the energy efficiency that can be achieved by using traffic scheduling in IP over WDM networks. A mixed integer linear programming model is developed to optimize routing and scheduling in dynamically arriving demands, where part of the demands can be allocated within a sliding window. The results show that scheduling improves the energy efficiency of non-bypass IP/WDM networks, with traffic grooming by up to 25% and blocking is reduced by 30%.

Energy efficient core networks using network coding

In this paper we investigate the use of network coding to improve energy efficiency of core networks. A mixed integer linear programming model is developed to optimize routing in network coding enabled non-bypass IP/WDM networks considering unicast traffic flows. We quantify the power savings obtained by implementing network coding. The results show that network coding can improve the energy efficiency of non-bypass IP/WDM networks by up to 33% compared to conventional architectures.

Bounds for Energy-Efficient Survivable IP Over WDM Networks With Network Coding

In this work, we establish analytic bounds for the energy efficiency of 1+1 survivable IP over WDM networks using network coding. The analytic bounds are shown to be in close agreement with our previously reported results. They provide verification of the MILP and heuristics proposed previously, in addition to an efficient, compact means to evaluate network results and allow the performance of large networks to be determined easily. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.

Energy efficient survivable IP-over-WDM networks with network coding

In this work we investigate the use of network coding in 1 + 1 survivable IP-over-wavelength-division-multiplexing (WDM) networks by encoding the protection paths of multiple flows with each other at intermediate nodes. We study the energy efficiency of this scheme through mixed-integer linear programming (MILP) and a heuristic with five operating options. We evaluate the MILP and the heuristics on typical and regular network topologies. Our results show that implementing network coding can produce savings up to 37% on the ring topology and 23% considering typical topologies. We also study the impact of varying the demand volumes on the network coding performance.

Network coding for energy efficiency in bypass IP/WDM networks

Network coding has been proven to be an effective approach towards achieving the network capacity and resources efficiency. However, most of the work achieved has been under the umbrella of wireless networks. In this paper we investigate the use of network coding to improve energy efficiency of the IP/WDM optical core considering unicast traffic flows by implementing coding at the optical layer of intermediate nodes. The mixed integer linear programming results show that network coding can improve the energy efficiency by up to 28% on the NSFNET compared to conventional non-bypass approach. The results show that the network coded bypass approach also outperforms the conventional bypass approach.

Routing post-disaster traffic floods heuristics

In this paper, we present three heuristics for mitigating post-disaster traffic floods. First exploiting the excess capacity, second rerouting backup paths, finally redistributing the whole traffic by rerouting the working and protection paths to accommodate more floods. Using these mitigation approaches can reduce the blocking by up to 30%.