  There is a wide range of topologies to use in simulation that can make
research divergency; therefore, we propose a topology set that can be used in
research of network behaviour in Software Defined Network (SDN). This paper can
unite the trend research that is doing in different aspects of SDN. One of the
most effective items which show the behaviour of the proposed model in SDN is
the number of paths that exist between each couple of nodes; hence, we propose
three basic topologies to show this parameter. This paper is useful for those
who are working on SDN and intend to evaluate the effect of their proposal
considering the number of paths. Finally, three topologies called sparse,
partial-mesh and full-mesh will be introduced in this paper.
