Case Study: NSF

National Science Foundation GENI Test

The National Science Foundation (NSF) supported the original research, and ultimately facilitated an evaluation of the initial implementation of Mode HALO on the NSF network testbed, GENI (Figure 1). In this experiment, the researchers deployed a network across the United States, using the shared compute resources at GENI Points of Presence (PoPs) to create virtual routers (connected as shown in Figure 2). They then used a randomly generated, high-demand traffic matrix to set the communication rates among PoPs, while the routers at each PoP ran Mode HALO. The resulting network path diversity required traffic at each PoP to be apportioned in some non-trivial manner, for optimal bandwidth use and minimized overall network delay in the face of dynamic traffic spikes.

NSF GENI Underlay
FIGURE 1: NSF GENI Underlay
Mode HALO Virtual Router Overlay
FIGURE 2: Mode HALO Virtual Router Overlay

As shown in Figure 3, Mode HALO supported 300% the throughput at the lowest possible delay between hosts in New York and Sunnyvale, when compared with the prior state-of-the-art used by network operators to handle traffic spikes.

Mode HALO supports higher throughput and preserves optimal latencies
FIGURE 3: Mode HALO supports higher throughput and preserves optimal latencies

Unlike heuristic protocols, Mode HALO was able to quickly adapt to dynamic traffic changes (Figure 4) without prior knowledge. This inherent dynamism is the key to the performance, flexibility, and reliability of Mode Core.

Mode HALO rapidly adapts to dynamic traffic changes, driving towards optimal latency
FIGURE 4: Mode HALO rapidly adapts to dynamic traffic changes, driving towards optimal latency

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