'Global view' in SDN
Ajay Nehra, Meenakshi Tripathi, Manoj Singh Gaur · 2017
Software Defined Network (SDN) provides a programmable and flexible network with separation in data and control plane. SDN has the capability to maintain a `Global View' at the cotroller which is the core of all SDN promises. A global view refers to the information about existence of switches, links between switches and attached hosts. A global view provides support for several topology aware applications such as shortest routing path, link load balancer, etc. In this research article, we examine how different controllers specifically POX, Ryu, OpenDaylight, Floodlight, Beacon, ONOS, HPEVAN discover links to achieve `Global view'. Furthermore it discusses vulnerabilities in these existing implementations. It also provides a analysis of the resulting threats namely Link Layer Discovery Protocol (LLDP) poisoning, LLDP flooding, & LLDP replay attack on these controllers.