Latency-Aware Resource Orchestration in SDN-Based Packet Over Optical Flexi-Grid Transport Networks

Abstract

In the upcoming 5G networks and following the emerging Software Defined Network/Network Function Virtualization (SDN/NFV) paradigm, demanded services will be composed of a number of virtual network functions that may be spread across the whole transport infrastructure and allocated in distributed Data Centers (DCs). These services will impose stringent requirements such as bandwidth and end-to-end latency that the transport network will need to fulfill. In this paper, we present an orchestration system devised to select and allocate virtual resources in distributed DCs connected through a multi-layer (Packet over flexi-grid optical) network. Three different on-line orchestration algorithms are conceived to accommodate the incoming requests by satisfying computing, bandwidth and end-to-end latency constraints, setting up multi-layer connections. We addressed end-to-end latency requirements by considering both network (due to propagation delay) and processing delay components. The proposed algorithms have been extensively evaluated and assessed (via a number of figures of merit) through experimental tests carried out in a Packet over Optical Flexi-Grid Network available in the ADRENALINE testbed with emulated DCs connected to it.

IT and Multi-layer Online Resource Allocation and Offline Planning in Metropolitan Networks

“…Subsequently, Casellas et al focus on the control aspects in control, management, and orchestration systems for optical networks that consider multi-layer optical networks and cloud resources for enabling 5G network slicing [12]. Recently, works in [13] and [14] focus on wide-area networks (WANs) for applying SDN and NFV, hence enabling the IT-network joint perspective in multi-layer networks. Both [13]and [14] are based on well-known protocols (e.g.…”

“…Recently, works in [13] and [14] focus on wide-area networks (WANs) for applying SDN and NFV, hence enabling the IT-network joint perspective in multi-layer networks. Both [13]and [14] are based on well-known protocols (e.g. PCEP) to propose an ad-hoc architecture that targets latency aspects in [14].…”

“…Both [13]and [14] are based on well-known protocols (e.g. PCEP) to propose an ad-hoc architecture that targets latency aspects in [14]. Remarkably, Bravalheri et al [15] report an extension of OSM that specifically targets the WAN resource allocation jointly with multi-site IT infrastructure management.…”

Reprovisioning for latency-aware dynamic service chaining in metro networks

“…In addition, latency-aware algorithms for SC provisioning are proposed in a number or works in the literature. As an example, authors in [15] provide different algorithms to dynamically provision SCs in distributed datacenters satisfying bandwidth, computing and end-to-end latency requirements of SCs. However,none of these works considers multi-layer resource assignment (as we do in this work considering jointly OTN and WDM layers) and re-provisioning, the main novel aspect of our current study.…”

Reinforcement Learning for Service Function Chain Reconfiguration in NFV-SDN Metro-Core Optical Networks

“…Authors in [31] made an evaluation study on an NFV-SDN orchestration system devised to select and allocate virtual resources in distributed DCs connected through a multi-layer (packet over flexi-grid optical) network. The experimental performance evaluation is carried out using a real testbed encompassing a cloud/network infrastructure.…”