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An ideal network troubleshooting system would be an almost fully automatedsystem, monitoring the whole network at once, feeding the results to aknowledge-based decision making system that suggests actions to the operator orcorrects the failure automatically. Reality is quite the contrary: operatorsseparated in their offices try to track down complex networking failures intheir own way, which is generally a long sequence of manually edited parallelshell commands (mostly ping, traceroute, route, iperf, ofctl etc.). Thisprocess requires operators to be "masters of complexity" (which they often are)and continuous interaction. In this paper we aim at narrowing this huge gapbetween vision and reality by introducing a modular framework capable of (i)formalizing troubleshooting processes as the concatenation of executablefunctions [called Troubleshooting Graphs (TSGs)], (ii) executing these graphsvia an interpreter, (iii) evaluating and navigating between the outputs of thefunctions and (iv) sharing troubleshooting know-hows in a formalized manner.

A Little Less Interaction, A Little More Action: A Modular Framework for Network Troubleshooting