  Although network functions virtualization and software-defined networking
offer many dynamic features such as flexibility, scalability, and
programmability for easy provisioning of services at a lesser cost and time
through service function chaining, it introduces new challenges in terms of
reliability, availability, and latency of services. Particularly,
softwarization of network and service functions (e.g., virtualization, anything
as a service, dynamic virtual chaining, and routing) impose high possibility of
network failures due to software issues than hardware. In this letter, we
propose a novel solution called eRESERV to enhance the reliability of service
chains in 5G while meeting the service level agreements.
