On the Availability of 5G VNF from Initialization Perspective

Virtual network function (vnf) can be useful for efficient use of cloud resources, specially for 5G networks, where dynamic creation, modification and deletion of virtual network functions are of special need. OpenStack is an open source cloud computing platform, where it is possible to create any virtual network function on demand. During creation of virtual network function, using Tacker or Mistral interface of OpenStack, the problem can arrive with respect to the reachability of vnf, which triggers the OpenStack to recreate the vnf. In this present work, we derive a closed form expression to analyze the availability of vnf considering the reachability problem during or after creation of virtual network function. Further, we compare availability of vnf considering two vnf creation procedures.