On Service-Chaining Strategies using Virtual Network Functions in Operator Networks

TL;DR

This paper investigates strategies for placing Virtual Network Function service chains and routing traffic in operator networks, demonstrating that a network enabled cloud with data centers and NFV nodes can significantly reduce resource consumption.

Contribution

It introduces a model for VNF service chain placement and traffic routing that minimizes network resource usage in operator networks.

Findings

Significant reduction in network-resource consumption with NeC deployment.

Model effectively optimizes VNF chain placement and traffic routing.

Supports dynamic service chaining for evolving network demands.

Abstract

Network functions (e.g., firewalls, load balancers, etc.) have been traditionally provided through proprietary hardware appliances. Often, hardware appliances need to be hardwired back to back to form a service chain providing chained network functions. Hardware appliances cannot be provisioned on demand since they are statically embedded in the network topology, making creation, insertion, modification, upgrade, and removal of service chains complex, and also slowing down service innovation. Hence, network operators are starting to deploy Virtual Network Functions (VNFs), which are virtualized over commodity hardware. VNFs can be deployed in Data Centers (DCs) or in Network Function Virtualization (NFV) capable network elements (nodes) such as routers and switches. NFV capable nodes and DCs together form a Network enabled Cloud (NeC) that helps to facilitate the dynamic service chaining required to support evolving network traffic and its service demands. In this study, we focus on the VNF service chain placement and traffic routing problem, and build a model for placing a VNF service chain while minimizing network resource consumption. Our results indicate that a NeC having a DC and NFV capable nodes can significantly reduce network-resource consumption.