Piotr Borylo

Energy-aware fog and cloud interplay supported by wide area software defined networking

The paper focuses on dynamic resource provisioning in an all optical wide area Software Defined Network supporting energy-aware interplay between fog and cloud. The main contribution of this paper is a latencyAware policy for handling fog related traffic. The policy is combined with anycast strategies in order to form a complete approach able to handle fog and cloud traffic simultaneously. The proposed approach was compared with reference solutions with respect to latency of fog related requests, CO2 emission and impact on network performance. It is shown that both latency and carbon footprint may be reduced without significant deterioration of network performance.

Anycast routing for carbon footprint reduction in WDM hybrid power networks with data centers

The paper focuses on dynamic resource provisioning which minimizes carbon footprint in optical networks. The main contribution of this paper consists of three anycast routing strategies aimed at reducing greenhouse gases emission by processing energy-intensive requests in data centers powered from renewable energy sources. The proposed strategies were compared with reference approaches with respect to CO2 emission and their impact on network performance. It is shown that they are able to significantly reduce greenhouse gases emission and, simultaneously, improve network performance.

Green Cloud Provisioning Throughout Cooperation of a WDM Wide Area Network and a Hybrid Power IT Infrastructure

The paper focuses on cooperation between cloud and network operators, as well as on fitting particular routing strategies to various cloud services. Three cooperation models are presented, analyzed and compared in the paper: the proposed model and two widely used reference models. The main difference between the models is the set of information being exchanged between the involved parties. Additionally, we analyze the applicability of four fitting schemas for each considered model. It is shown that the proposed model, alongside with an appropriate fitting schema, is able to reduce the blocking probability of cloud services requests. At the same time, thanks to the use of green anycast strategies, it is able to significantly reduce carbon dioxide emission.

Fitting green anycast strategies to cloud services in WDM hybrid power networks

The paper focuses on dynamic resource provisioning which minimizes carbon footprint of data centers interconnected via optical networks. The main contribution of this paper is a schema of fitting energy aware anycast strategies to different types of cloud services in order to reduce greenhouse gases emission. The proposed schema was compared to the cases when all types of cloud services were handled using the same anycast strategy. It is shown that the proposed schema is able to significantly reduce greenhouse gases emission without significant deterioration of network performance.

Dynamic power capping for multilayer hybrid power networks

The paper deals with the problem of optimizing the use of energy in a telecommunication network. We propose the power capping technology to effectively move power hungry tasks from nodes powered from non-renewable energy sources to nodes powered from renewable resources. The presented technology may also be used to optimize OPEX in case the cost of energy varies in different nodes. The presented results show, that the solution is extremely effective in meeting the aforementioned goals.

Survivable automatic hidden bypasses in Software-Defined Networks

Abstract The paper focuses on the problem of effective and resilient network resources management under condition of increasing Internet traffic. Multilayer automatic optical networks are considered as a solution usually indicated as the most appropriate for the future Internet. In this paper, we propose a Survivable Automatic Hidden Bypasses approach to enhance resource utilization and reliability in multilayer optical networks. Our solution uses the Software-Defined Networking concept to automatically create or remove hidden bypasses which are not visible at the network layer. We propose a novel survivability metric which is applied during optical bypass creation in order to handle network failures in a proactive manner. Such an approach contrasts with the most common one where bypasses are considered as a mechanism to handle network failures. We combine the metric with different restoration schemas and investigate the proposed mechanism under three failure scenarios. The mechanism of hidden bypasses increases throughput and reduces transmission delays while novel proactive survivability mechanisms neutralize negative impact of network failures.

SDNRoute: Integrated system supporting routing in Software Defined Networks

In this paper we introduce the SDNRoute system which aims to support routing decisions in Software Defined Networks. Such a system is especially important in the context of the SDN as this concept makes it possible to perform routing in a dynamic and elastic manner. We focus on the SDNRoute architecture and research challenges that must be investigated to develop the system. Additionally, we provide preliminary approaches to solve the issues including optimization problem formulation. Recent state of the art is presented regarding not only academia works but also industry deployments. It is especially important as SDNRoute system is being designed for the purpose of commercial application.

Designing and building SDN testbeds for energy-aware traffic engineering services

As experimenting with energy-aware techniques on large-scale production infrastructure is prohibitive, a large number of proposed traffic engineering strategies have been evaluated only using discrete-event simulations. The present work discusses (i) challenges towards building testbeds that allow researchers and practitioners to validate and evaluate the performance and quality of energy-aware traffic engineering strategies, (ii) requirements to fulfil when porting simulations to testbeds, and (iii) two proof-of-concept testbeds. One testbed uses and provides software-defined network (SDN) services created on the open-network operating system while the other is a composition of virtual Open vSwitches controlled by the Ryu SDN framework. The aim of the testbeds is to validate previously proposed energy-aware traffic engineering strategies in different environments. We detail the platforms and illustrate how they have been used for performance evaluation. Additionally, the paper compares results obtained in the testbeds with evaluations performed using discrete-event simulations and presents challenges faced while implementing energy-aware traffic engineering mechanisms as SDN services in testbed environments.

Intercloud: Solving Interoperability and Communication in a Cloud of Clouds (Frahim, J., et al; 2016) [Book Review]

The ability to share resources, services, responsibility, and management among cloud providers is the fundamental ssumption from the viewpoint of cloud interoperability. This idea is attracting increasing attention as cloud providers are becoming aware that meeting all customer needs without any cooperation is a demanding task. This book regards the issues of seamless and transparent cloud interoperability. Definitions, architectures, and use cases are provided, along with challenges and threats. The book is divided into nine chapters. The book presents the concepts, needs, advantages, and challenges regarding cloud interoperability. The assumed high level approach will be most suitable for readers responsible for technology assessment and service development. The authors provide business-level concepts, architectures, and data about standardization efforts. However, the covered practical use cases and workflow examples will also be attractive for network and IT managers. Timeliness is also undoubtedly a strong aspect of the book. Two minor drawbacks must be mentioned. The first one regards the organization of the book, and some improvements in this context will make the book more readable. The second issue concerns Chapters 2 and 5, as both could have been improved to be more easily comprehended by readers. Nevertheless, in summary, the book is recommended as a good and up-do-date source of information on cloud interoperability.

Assessment of a power capping strategy in a multilayer network with a variable number of green nodes

The paper deals with the problem of resource provisioning in a multilayer network connecting data centers, where a variable number of network nodes is powered by energy produced from renewable resources. We show that an enormous reduction of energy consumed in non-green nodes may be obtained by using the power capping strategy. We consider a rarely investigated set of scenarios covering a wide range of the number of green nodes in the network, starting from the network with one green node up to the case where almost all nodes are powered from renewable energy resources. We show that the effectiveness of the power capping implemented in the network highly depends on the number and location of green nodes as well as on the offered load, and is the greatest in networks with a moderate number of green nodes. Moreover, we show that a small number of nodes powered by renewable energy sources inevitably leads to high blocking probability of those nodes. A possible solution to this problem is also proposed.