Title Virtualized Networks for Cloud Computing: state-of-the-art and open challenges

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1 ACM SAC th Symposium On Applied Computing 7- March 18-22, Coimbra, Portugal Title Virtualized Networks for Cloud Computing: state-of-the-art and open challenges Duration 3h Abstract Cloud computing and network virtualization represent two of the most important topics of the moment in computer science. While cloud computing has changed the landscape of Information Technology with a new operation model, network virtualization is a paradigm shift that fosters real innovation in computer networks by allowing multiple protocol stacks and network instances to coexist. This tutorial provides a fresh view on clouds and network virtualization, explores data center infrastructures, and then discusses how network virtualization can help improve current cloud infrastructures, with potential to solve several of the problems they face today. On each subject, special attention will be given to open challenges and research directions. Brief Summary to the Topic There is a growing number of applications that move to the cloud, as a way to reduce operational and infrastructural costs. Warehouse-scale data centers are a fundamental component in this context. They allow multiple tenants to lease computing resources on-demand over a flexible pay-per-use model. This model is quite attractive as each application may increase/decrease its capacity by requesting/leasing servers and network capacity, thus allowing them to adapt to market trends. Moreover, the datacenter provider is responsible for maintaining the infrastructure and planning hardware expansions [34]. As attractive as this model may be, its shared nature raises major challenges. For example, sharing a datacenter network may cause: performance unpredictability, as current sharing models may not properly isolate concurrent traffic; novel security concerns, since several resources may be shared among rival companies or malicious tenants; and misbehavior on conventional Internet protocols, such as routing, TCP fairness etc. [14, 16, 21, 30, 31, 33, 35]. We begin introducing the key concepts and benefits of Cloud Computing and of Network Virtualization, including recent advances such as Software-Defined Networks. We then discuss cloud infrastructures, with focus on data center networks, and how

2 these can be virtualized. The tutorial closes with research challenges that merit investigation. Motivation, target audience, and interest for the SAC community This tutorial should be attractive for postgraduate students and researchers interested in the fields of computer networks, distributed systems or computer security. In particular, the tutorial touches two very hot topics in different research communities: Cloud Computing and Network Virtualization (including Software-Defined Networks). Outline 1. Introduction 2. Cloud Computing 3. Network Virtualization 4. Cloud Networks (data center networking) 5. Virtualizing Cloud Networks 6. Research Challenges 7. Final Remarks Expected background of the audience Prospective attendees should understand the basic operating system and computer network principles, therefore any senior undergraduate should profit from the tutorial. The presentation style is more interactive, with key concepts and their applications being followed by questions to the audience. The set of slides contains the basis to guide the discussion on the subject, but the level of detail actually employed in the presentation is adapted on-the-fly according to the feedback received (with questions). Biography of the Lecturer Prof. Marinho P. Barcellos INF/UFRGS Federal University of Rio Grande do Sul Av. Bento Gonçalves, Bloco IV Porto Alegre, RS Brazil - [email protected], [email protected] Prof. Marinho P. Barcellos received BSc and MSc degrees in Computer Science from Federal University of Rio Grande do Sul (1989 and 1993, respectively) and PhD degree in Computer Science from University of Newcastle Upon Tyne (1998). In , he worked in a joint project between University of Manchester and British Telecomm research labs on high-performance multicast transport. Since 2008 Prof. Barcellos has been with the Federal University of Rio Grande do Sul (UFRGS), where he is an Associate Professor. He has authored many papers in leading journals and conferences related to computer networks, network and service management, distributed systems, and computer security, also serving as TPC member and chair. He has authored book

3 chapters and delivered several tutorials and invited talks. His work as a lecturer has been consistently distinguished by graduating students. Prof. Barcellos was the appointed chair of the Special Interest Group on Computer Security of the Brazilian Computer Society (CESeg/SBC) He is a member of SBC, IEEE and ACM. His current research interests are cloud computing data center networks, softwaredefined networking, information-centric networks and security aspects of those networks. Please see Bibliography [1] M. Alizadeh, A. Kabbani, T. Edsall, B. Prabhakar, A. Vahdat, and M. Yasuda, Less is more: trading a little bandwidth for ultra-low latency in the data center, presented at the NSDI'12: Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation, [2] D. Arora, A. Feldmann, G. Schaffrath, and S. Schmid, On the benefit of virtualization: strategies for flexible server allocation, presented at the Hot-ICE'11: Proceedings of the 11th USENIX conference on Hot topics in management of internet, cloud, and enterprise networks and services, [3] H. Ballani, P. Costa, T. Karagiannis, and A. Rowstron, The price is right: towards locationindependent costs in datacenters, presented at the HotNets-X: Proceedings of the 10th ACM Workshop on Hot Topics in Networks, [4] T. Benson, A. Akella, A. Shaikh, and S. Sahu, CloudNaaS: a cloud networking platform for enterprise applications, presented at the SOCC '11: Proceedings of the 2nd ACM Symposium on Cloud Computing, [5] K. Chen, A. Singlay, A. Singhz, K. Ramachandranz, L. Xuz, Y. Zhangz, X. Wen, and Y. Chen, OSA: an optical switching architecture for data center networks with unprecedented flexibility, presented at the NSDI'12: Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation, [6] Q. Duan, Modeling and Performance Analysis on Network Virtualization for Composite Network- Cloud Service Provisioning, Services (SERVICES), 2011 IEEE World Congress on, pp , [7] Z. Feng, H. Wu, and J. Su, Exploring potential vulnerabilities in data center network, presented at the CoNEXT '10 Student Workshop: Proceedings of the ACM CoNEXT Student Workshop, [8] C. Guo, G. Lu, H. J. Wang, S. Yang, C. Kong, P. Sun, W. Wu, and Y. Zhang, SecondNet: a data center network virtualization architecture with bandwidth guarantees, presented at the Co-NEXT '10: Proceedings of the 6th International COnference, [9] T. A. Henzinger, A. V. Singh, V. Singh, T. Wies, and D. Zufferey, A marketplace for cloud resources, presented at the EMSOFT '10: Proceedings of the tenth ACM international conference on Embedded software, [10] V. T. Lam, S. Radhakrishnan, R. Pan, A. Vahdat, and G. Varghese, Netshare and stochastic netshare: predictable bandwidth allocation for data centers, SIGCOMM Computer Communication Review, vol. 42, no. 3, Jun [11] A. Li, X. Yang, S. Kandula, and M. Zhang, CloudCmp: comparing public cloud providers, presented at the IMC '10: Proceedings of the 10th annual conference on Internet measurement, [12] J. Matias, E. Jacob, D. Sanchez, and Y. Demchenko, An OpenFlow Based Network Virtualization Framework for the Cloud, presented at the Cloud Computing Technology and Science (CloudCom), 2011 IEEE Third International Conference on, 2011, pp [13] B. Peng, A. Hammad, R. Nejabati, S. Azodolmolky, D. Simeonidou, and V. Reijs, A Network Virtualization Framework for IP Infrastructure Provisioning, presented at the Cloud Computing Technology and Science (CloudCom), 2011 IEEE Third International Conference on, 2011, pp

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