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<body><div>A reminder and request: please join us for the below faculty candidate talk. We very much need good turnout and an inquisitive audience--candidates judge the vibrancy of the intellectual life of our department by how engaged we are at talks!<br></div>
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<div>Today's candidate, Stefano Vissicchio, won the best paper award at SIGCOMM 2015 for his work on "fibbing," a system that ingeniously lets a central controller "lie" to routers over a routing protocol to achieve complex network control behavior that typically requires new SDN-style switches using only legacy routers. This work also won the IETF/IRTF applied networking research prize.<br></div>
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<div>The talk targets a broad CS audience, so should be accessible and interesting to all. <span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt">Title, abstract, and bio follow below.</span></span><br></div>
<div><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt">See you there!</span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt">-Brad, <a href="mailto:bkarp@cs.ucl.ac.uk" style="text-decoration: underline; color: rgb(5, 99, 193);">bkarp@cs.ucl.ac.uk</a></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt">----------------------------------------------------------------------------------------------------------------------------------------------</span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b><span class="size" style="font-size:14pt">UCL CS Faculty Candidate Talk</span></b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b>Title: Overcoming the dichotomy between distributed and centralized routing in communication networks</b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b> </b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b>Speaker: Dr. Stefano Vissicchio, postdoctoral researcher, Université catholique de Louvain <a href="http://www.uclouvain.be/stefano.vissicchio" style="text-decoration: underline; color: rgb(5, 99, 193);">http://www.uclouvain.be/stefano.vissicchio</a></b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b> </b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b><span class="colour" style="color:red">Location and time: Roberts G06 Sir Ambrose Fleming LT, 14.00 – 15.30, Friday 10 June</span></b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b><br></b><br><b>Abstract:</b></span></span></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><br>Routing is a basic problem that network operators have to solve to control how traffic flows in their networks. Traditionally, routing decisions are taken by distributed protocols, sharing computation across network nodes. In the era of software defined networking
(SDN), however, such a traditional approach is questioned, with many researchers (and operators) arguing for centralized routing.<br> <br> In this talk, I will first focus on traditional, distributed routing. On one hand, I will overview our findings on how theoretically hard is to configure, reconfigure and monitor common routing protocols for practical needs. Indeed, basic properties (like eventual
consistency of routing decisions, propagation of routing information or forwarding correctness) are not guaranteed in general, and even deciding if such properties hold for a specific network is computationally-hard.</span></span></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><br>On the other hand, I will show how to work around such complexity. Namely, I will discuss our proposed best practices for safe routing configuration as well as our algorithms and system prototypes to practically assist operators in network management tasks.
With those elements in minds, I will elaborate on the main pros and cons of traditional and SDN architectures.<br> <br> Finally, I will show how to overcome the dichotomy between centralized and distributed routing. I will introduce hybrid network architectures, where routing tasks are shared between distributed and centralized components, in order to sum the benefits of the
two approaches while avoiding their respective drawbacks. As a concrete example, I will report on Fibbing, a readily-deployable, flexible and robust solution to achieve central control over distributed routing protocols.</span></span></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><b>Bio:</b></span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"> </span></span><br></p><p style="margin: 0cm 0cm 0.0001pt;"><span class="font" style="font-family:Calibri, sans-serif"><span class="size" style="font-size:11pt"><span>Stefano Vissicchio received his Master degree from the Roma Tre University (Rome, Italy) in 2008, and his PhD degree from the same institution in 2012. He now holds a postdoctoral position at the University of Louvain
(UCL), Belgium. His research interests include network management, routing protocols, measurements and software defined networking. On those topics, he published several articles at top conferences and journals, including the ICNP 2013 and SIGCOMM 2015 best
papers.</span></span></span><br></p></div>
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