Resilient NFV Technology and Solutions

In this chapter, we present an overview of the Network Functions Virtualization (NFV) concept and discuss the main design features with respect to their dependability implications. As NFV systems are expected to be used extensively in the future to enable flexible and robust provisioning of numerous network services, including mobile telecommunications, they need to be protected against large-scale failure scenarios. We analyze the dependability of NFV systems from two different perspectives and identify the corresponding challenges together with the selected existing solutions. Finally, we review Cloud application technologies and design models in implementing Virtual Network Functions

Hybrid Software-Defined Network Monitoring

Software defined networking (SDN) with OpenFlow-enabled switches operate alongside traditional switches has become a matter of fact in ISP network paradigms which are known as a hybrid SDN (H-SDN) network. When the centralized controller of SDN introduced into an existing network, significant improvement in network use as well as reducing packet losses and delays are expected. However, monitoring such networks is the main concern for better traffic management decision making which can lead to a maximum throughput performance. There is, to our knowledge, only one actual article proposed for H-SDN monitoring scheme so far. Thus, this paper surveys several monitoring methods/techniques for both networks, then propose taxonomy criteria to evaluate the various monitoring methods. The survey includes discussing the design concepts, accuracy and limitations for each, eventually summarize the future research directions for integrated perspective of monitoring in H-SDN networks