MapReduce: simplified data processing on large clusters
Communications of the ACM - 50th anniversary issue: 1958 - 2008
OFRewind: enabling record and replay troubleshooting for networks
USENIXATC'11 Proceedings of the 2011 USENIX conference on USENIX annual technical conference
A NICE way to test openflow applications
NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
Abstractions for network update
Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication
Reproducible network experiments using container-based emulation
Proceedings of the 8th international conference on Emerging networking experiments and technologies
FatTire: declarative fault tolerance for software-defined networks
Proceedings of the second ACM SIGCOMM workshop on Hot topics in software defined networking
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Tolerating and recovering from link and switch failures are fundamental requirements of most networks, including Software-Defined Networks (SDNs). However, instead of traditional behaviors such as network-wide routing re-convergence, failure recovery in an SDN is determined by the specific software logic running at the controller. While this admits more freedom to respond to a failure event, it ultimately means that each controller application must include its own recovery logic, which makes the code more difficult to write and potentially more error-prone. In this paper, we propose a runtime system that automates failure recovery and enables network developers to write simpler, failure-agnostic code. To this end, upon detecting a failure, our approach first spawns a new controller instance that runs in an emulated environment consisting of the network topology excluding the failed elements. Then, it quickly replays inputs observed by the controller before the failure occurred, leading the emulated network into the forwarding state that accounts for the failed elements. Finally, it recovers the network by installing the difference ruleset between emulated and current forwarding states.