| 1. |
- Andersson, H. Robert H., et al.
(författare)
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Flipping the Data Center Network : Increasing East-West Capacity Using Existing Hardware
- 2017
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Ingår i: 2017 IEEE 42nd Conference on Local Computer Networks (LCN), 9-12 Oct. 2017. - : IEEE. - 9781509065233 - 9781509065226 ; , s. 211-214
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Konferensbidrag (refereegranskat)abstract
- In today's datacenters, there is an increasing demand for more network traffic capacity. The majority of the increase in traffic is internal to the datacenter, i.e., it flows between different servers within the datacenter. This category of traffic is often referred to as east-west traffic and traditional hierarchical architectures are not well equipped to handle this type of traffic. Instead, they are better suited for the north-southbound traffic between hosts and the Internet. One suggested solution for this capacity problem is to adopt a folded CLOS topology, also known as spine-leaf, which often relies on software defined network (SDN) controllers to manage traffic. This paper shows that it is possible to implement a spine-leaf network using commodity-ofthe-shelf switches and thus improve the east-west traffic capacity. This can be obtained using low complexity configuration and edgerouting for load balancing, eliminating the need for a centralized SDN controller.
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| 2. |
- Brachmann, Martina, et al.
(författare)
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Keep the Beat: On-The-Fly Clock Offset Compensation for Synchronous Transmissions in Low-Power Networks
- 2017
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Ingår i: Proceedings of the 42nd Annual IEEE Conference on Local Computer Networks (LC). - 9781509065226 ; 2017-October, s. 303-311
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Konferensbidrag (refereegranskat)abstract
- Emerging protocols for low-power wireless networks increasingly exploit constructive interference and the capture effect. The basic idea is that the synchronous transmission of identical packets by neighboring nodes leads to constructive interference - or at least do not cause destructive interference. This requires that the temporal displacement of packets at receiving nodes is lower than 0.5 s when employing IEEE 802.15.4 radios. However, commonly used sensor nodes are equipped with cheap and imprecise clocks that show high frequency deviations across nodes, making constructive interference difficult to achieve. Such deviations further increase when individual nodes are exposed to different temperatures. In this paper we introduce Flock, a novel approach to compensate for differences in clock frequency across synchronously transmitting nodes. We implemented Flock in Contiki on the example of Glossy, a flooding protocol based on synchronous transmissions. Our results confirm that Flock can achieve constructive interference on real sensor nodes in over 98% of the cases. Overall, Flock makes protocols that exploit synchronous transmissions more robust to operate even in challenging environments.
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