Keynote talks

Keynote talk by Zhi-Li Zhang


Bring "Topology" Back to Network Topology: Resilient Network Routing Made Easy


In computer and communication networks, while the term "topology" is used in network topology, network topology is simply viewed as a graph consisting of nodes and links. This combinatorial view of network topology confines how network routing is performed, especially in a distributed setting. For example, in IP networks destination-based shortest path routing is used to ensure routing consistency, which significantly restricts the abilities for pro-actively computed fail-over path  computations and multi-path routing. In this talk we will first provide an overview of existing IP Fast Rerouting algorithms and use them to illustrate the difficulties and complexities in their designs due to the need to ensure routing consistency. In the remainder of this talk, we advocate and present a truly "topological" perspective of network topology by viewing it as a topological space as opposed to a combinatorial  object. Mathematically, a topological space is a set together with a structure (a collection of open sets defined on the set); consequently, a topological structure is endowed with a natural  hierarchical structure. To bring "topology" to network topology, the key idea is to embed the physical network connectivity structure into a (logical) topological space (e.g., a metric or Euclidean space). We use VIRO (Virtual Id ROuting) as an example to illustrate how this novel topological perspective enables us to develop far more flexible and scalable resilient network routing algorithms. We conclude by arguing why such a perspective is particularly useful in -- and how it is  further enabled by -- the emerging software-defined networking paradigm. If time permits, we will also briefly touch on inter-dependency issues in critical physical infrastructures such as power grid and data communication networks. 


Zhi-Li Zhang received the B.S. degree in computer science from Nanjing University, China, in 1986 and his M.S. and Ph.D. degrees in computer science from the University of Massachusetts, in 1996.  He joined the faculty of the Department of  Computer Science and Engineering at the University of Minnesota in 1997, where  he is currently the Qwest Chair Professor in Telecommunications and Distinguished McKnight University Professor. Prof. Zhang's research interests lie  broadly in computer communication  and networks, Internet technology, multimedia and emerging applications. His past research was centered on the analysis, design and development of scalable Internet QoS solutions to support performance-demanding multimedia applications. His current research thrusts focus primarily on i) building  highly scalable, resilient and secure Internet infrastructure and mechanisms to enhance Internet service availability, reliability, mobility, manageability and security; and on ii) developing  next-generation, service-oriented, manageable and economically viable Internet architectures to provide better support for creation, deployment, operations and and management of value-added Internet services and underlying networks. 

Prof. Zhang has served on the Editorial Boards of IEEE/ACM Transactions on Networking, Elversier's Computer Network Journal, and Chinese Academy of Science's Journal of Computer Science and Technology. He was Technical Program Co-chair of IEEE INFOCOM 2006, ACM/USENIX IMC'08, IFIP Networking'13 and IEEE ICNP'13. Prof. Zhang has served  on the  Technical Program Committees of various conferences and workshops including ACM SIGCOMM, ACM SIGMETRICS, ACM/USENIX IMC, IEEE INFOCOM, IEEE ICNP and CoNext. He received the National Science Foundation CAREER Award in 1997. He has also been awarded the prestigious McKnight Land-Grant Professorship and George Taylor Distinguished Research Award at the University of Minnesota, and the Miller Visiting Professorship at Miller Institute for Basic Sciences, University of California, Berkeley. Prof. Zhang is co-recipient of an ACM  SIGMETRICS best paper award, an IEEE International Conference on Network Protocols (ICNP) best paper award, and an IEEE INFOCOM best paper award, and an RAID best paper award. He is a member of IEEE and ACM, and a fellow of IEEE.  

You can find more information about Prof. Zhang and his publications at


The work reported in this talk is support in part by US NSF, DoD DTRA and Army MURI research grants.

Keynote talk by by Deep Medhi (previously Karl May - cancelled)


Multi-layer Networks to Network Virtualization: Taking a protection and restoration perspective


Network deployment architecture is multi-layered in nature, for example, IP over DWDM. In recent years, this architecture is further extended due to services that use overlays and network virtualization. Similarly, below IP, additional functionalities such as OTN (optical transport network) are being interjected between IP and DWDM. In such multi-layer networks, usually each layer operates its network protection function in different time scales. In this talk, I will discuss the impact on network protection and restoration, and potential impact on system stability with the disappearance of time-scale of changes in each layer while visiting technology evolution in the past two decades.


Deep Medhi is Curators' Professor in the Department of Computer Science and Electrical Engineering at the University of Missouri-Kansas City, USA. He received B.Sc. in Mathematics from Cotton College, Gauhati University, India, M.Sc. in Mathematics from the University of Delhi, India, and his Ph.D. in Computer Sciences from the University of Wisconsin-Madison, USA. Prior to joining UMKC in 1989, he was a member of the technical staff at AT&T Bell Laboratories. He has been an invited visiting professor at the Technical University of Denmark, a visiting research fellow at Lund Institute of Technology, Sweden, and State University of Campinas, Brazil, and a Fulbright Senior Specialist. He is the Editor-in-Chief of Springer’s Journal of Network and Systems Management, and is on the editorial board of IEEE/ACM Transactions on Networking, IEEE Transactions on Network and Service Management, and IEEE Communications Surveys & Tutorials. He is co-author of the books, Routing, Flow, and Capacity Design in Communication and Computer Networks (2004) and Network Routing: Algorithms, Protocols, and Architectures (2007), both published by Morgan Kaufmann Publishers, an imprint of Elsevier Science.

AFFILIATION: University of Missouri-Kansas City, USA

Keynote talk by Rob Snijder


Optimising Service Availibility in a MVNO context


The talk will address the main factors that drive MVNO service Availibility based on the real live experience of a complex MVNE:

  1. network reliability
  2. economic constraints
  3. organisational design
  4. TTM demands
  5. vendor and service provider management through SLAs


Rob Snijder, Chief Technical Officer, brings 30+ years of ICT experience to Teleena and has been building mobile services and companies/organisations in many countries since 2000. Turning a strong industry vision into working solutions for customers, Rob is heading up the delivery and engineering organisation for Teleena and leading the introduction of revolutionary new technologies that will position our customers at the forefront of the real time data centric world. 


Teleena is a fast growing Netherlands based MVNE operating a full mobile core network and OSS/BSS platform. Radio access is provided by a number of different MNOs, serving 500k+ subscribers in 15+ MVNOs in several countries. More info: