1 research outputs found
Towards QoS-aware Provisioning of Chained Virtual Security Services in Edge Networks
Future networks are expected to deliver low-latency,
user-specific services in a flexible and efficient manner. Operators
have to ensure infrastructure resilience in the face of such
challenges, while maintaining service guarantees for subscribed
users. One approach to support emerging use cases is through the
introduction and user of virtualised network functions (VNFs)
at the edge of the network. While placement of VNFs at the
network edge has been previously studied, it has not taken into
account services comprised of multiple VNFs and considerations
for network security.
In this paper we propose a mathematical model for latencyoptimal on-path allocation of VNF chains on physical servers
within an edge network infrastructure, with special considerations for network security applications and operator’s best
practices. We acknowledge the challenges of employing optimal
solutions in real networks and provide the Minimal Path Deviation
Allocation algorithm for placement of security-focused network
services in a distributed edge environment, minimising end-to-end latency for users.
We then evaluate our placement results over a simulated
nation-wide network using real-world latency characteristics.
We show that our placement algorithm provides near-optimal
placement, with minimal latency violations with respect an
optimal solution, whilst offering robust tolerance to temporal
latency variations