SDN controller for network-aware adaptive orchestration in dynamic service chaining

This paper presents an SDN orchestrator that offers adaptive path provisioning in dynamic service chaining to recover from congestion events throughout service chain paths. Moreover, the SDN orchestrator exposes a Northbound interface based on REST principles and on the Intent-Based Network Modeling Language data model that allows applications to describe their requirements for the network (including dynamic service chaining) without being concerned with low-level implementation details. Experiments in an emulated network environment have been carried out to show the feasibility of the approach and to evaluate the effectiveness of the orchestration process in terms of network resource usage and adaptation overhead.