Automated Source Code Extension for Debugging of OpenFlow based Networks

Software-Defined Networks using OpenFlow have to
provide a reliable way to to detect network faults in operational
environments. Since the functionality of such networks is mainly
based on the installed software, tools are required in order to
determine software bugs. Moreover, network debugging might be
necessary in order to detect faults that occurred on the network
devices. To determine such activities, existing controller programs
must be extended with the relevant functionality. In this paper
we propose a framework that can modify controller programs
transparently by using graph transformation, making possible
online fault management through logging of network parameters
in a NoSQL database. Latter acts as a storage system for flow
entries and respective parameters, that can be leveraged to detect
network anomalies or to perform forensic analysis.