  The introduction of SDN in large-scale IP provider networks is still an open
issue and different solutions have been suggested so far. In this paper we
propose a hybrid approach that allows the coexistence of traditional IP routing
with SDN based forwarding within the same provider domain. The solution is
called OSHI - Open Source Hybrid IP/SDN networking as we have fully implemented
it combining and extending Open Source software. We discuss the OSHI system
architecture and the design and implementation of advanced services like Pseudo
Wires and Virtual Switches. In addition, we describe a set of Open Source
management tools for the emulation of the proposed solution using either the
Mininet emulator or distributed physical testbeds. We refer to this suite of
tools as Mantoo (Management tools). Mantoo includes an extensible web-based
graphical topology designer, which provides different layered network "views"
(e.g. from physical links to service relationships among nodes). The suite can
validate an input topology, automatically deploy it over a Mininet emulator or
a distributed SDN testbed and allows access to emulated nodes by opening
consoles in the web GUI. Mantoo provides also tools to evaluate the performance
of the deployed nodes.
