HEDGE: Traffic Engineering with Probabilistic Link Capacities
summary
Lab experiments and a production cloud trace show that individual wavelengths on the same fiber fail independently enough to make link capacity a discrete random variable, causing up to 40 capacity fluctuations per five minutes. The authors build a 100 km optical testbed with three wavelengths and quantify failures across QPSK/8QAM/16QAM. They introduce wavelength-specific faults, implement HEDGE-A provisioning to meet Cmin with the fewest spectral channels, and run HEDGE TE to maximize expected throughput, dropping 12.2× fewer flows and displacing tunnels 622× less than an oracle reconfigure approach.
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chapters (7)
- 0:00HEDGE introduction
- 2:05Wavelength faults in optical links
- 4:55Stochastic link capacities evidence
- 5:58HEDGE capacity guarantees
- 9:50HEDGE TE for stochastic networks
- 13:24HEDGE performance evaluation
- 15:31Broader implications
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