The Software Defined Network (SDN) is a relatively new paradigm that aims to tackle the lack of centralization in the existing network by separating the control centre from the programming data plane. The controller keeps an overview of the structure of the whole network, which makes it vulnerable to possible topology poisoning attacks. Topology attacks aim to disrupt the overview of the controller over the structure of the network in order to intercept or disrupt the transfer of the packages over the SDN network. In this paper, a survey on the state-of-the-art on topology attacks is conducted, followed by an analysis of the limitations of the existing solutions, and a comparison between the verification process of each solution and the number of known vulnerabilities are presented. Further, possible future research directions are proposed for improving these solutions and fixing the mentioned limitations and vulnerabilities.