1.3.1. Introduction

The goal of this project is to build an NFVI fault management and maintenance framework supporting high availability of the Network Services on top of the virtualized infrastructure. The key feature is immediate notification of unavailability of virtualized resources from VIM, to support failure recovery, or failure avoidance of VNFs running on them. Requirement survey and development of missing features in NFVI and VIM are in scope of this project in order to fulfil requirements for fault management and maintenance in NFV.

The purpose of this requirement project is to clarify the necessary features of NFVI fault management, and maintenance, identify missing features in the current OpenSource implementations, provide a potential implementation architecture and plan, provide implementation guidelines in relevant upstream projects to realize those missing features, and define the VIM northbound interfaces necessary to perform the task of NFVI fault management, and maintenance in alignment with ETSI NFV [ENFV]. Problem description

A Virtualized Infrastructure Manager (VIM), e.g. OpenStack [OPSK], cannot detect certain Network Functions Virtualization Infrastructure (NFVI) faults. This feature is necessary to detect the faults and notify the Consumer in order to ensure the proper functioning of EPC VNFs like MME and S/P-GW.

  • EPC VNFs are often in active standby (ACT-STBY) configuration and need to switch from STBY mode to ACT mode as soon as relevant faults are detected in the active (ACT) VNF.

  • NFVI encompasses all elements building up the environment in which VNFs are deployed, e.g., Physical Machines, Hypervisors, Storage, and Network elements.

In addition, VIM, e.g. OpenStack, needs to receive maintenance instructions from the Consumer, i.e. the operator/administrator of the VNF.

  • Change the state of certain Physical Machines (PMs), e.g. empty the PM, so that maintenance work can be performed at these machines.

Note: Although fault management and maintenance are different operations in NFV, both are considered as part of this project as – except for the trigger – they share a very similar work and message flow. Hence, from implementation perspective, these two are kept together in the Doctor project because of this high degree of similarity.