October 09, 2017

STAR: Preventing flow-table overflow in software-defined networks

  • Chao H.
  • Guo Z.
  • Gushchin A.
  • Liu R.
  • Walid A.
  • Xu Y.

The emerging Software-Defined Networking (SDN) enables network innovation and flexible control for network operations. A key component of SDN is the flow table at each switch, which stores flow entries that define how to process the received flows. In a network that has a large number of active flows, flow tables at switches can be easily overflowed, which could cause blocking of new flows or eviction of entries of some active flows. The eviction of active flow entries, however, can severely degrade the network performance and overload the SDN controller. In this paper, we propose Software-defined Adaptive Routing (STAR), an online routing scheme that efficiently utilizes limited flow-table resources to maximize network performance. In particular, STAR detects real-time flow-table utilization of each switch, intelligently evicts expired flow entries when needed to accommodate new flows, and selects routing paths for new flows based on flow-table utilizations of switches across the network. Simulation results based on the Spanish backbone network show that, STAR outperforms existing schemes by decreasing the controller's workload for routing new flows by about 87%, reducing packet delay by 49%, and increasing average throughput by 123% on average when the flow-table resource is scarce. (C) 2017 Elsevier B.V. All rights reserved.

View Original Article

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...