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Abstract
Telecom operators’ infrastructure is undergoing high pressure to keep the pace with the traffic demand generated by the societal need of remote communications, bandwidth-hungry applications, and the fulfilment of 5G requirements. Software-defined networking (SDN) entered in scene decoupling the data-plane forwarding actions from the control-plane decisions, hence boosting network programmability and innovation. Optical networks are also capitalizing on SDN benefits jointly with a disaggregation trend that holds the promise of overcoming traditional vendor-locked island limitations. In this work, we present our framework for disaggregated optical networks that leverages on SDN and container-based management for a realistic emulation of deployment scenarios. Our proposal relies on Kubernetes for the containers’ control and management, while employing the NETCONF protocol for the interaction with the light-weight software entities, i.e., agents, which govern the emulated optical devices. Remarkably, our agents’ structure relies on components that offer high versatility for accommodating the wide variety of components and systems in the optical domain. We showcase our proposal with the emulation of an 18-node European topology employing Cassini-compliant optical models, i.e., a state-of-the-art optical transponder proposed in the Telecom Infrastructure Project. The combination of our versatile framework based on containerized entities, the automatic creation of agents and the optical-layer characteristics represents a novel approach suitable for operationally complex carrier-grade transport infrastructure with SDN-based disaggregated optical systems.
Highlights
The rapid growth of Internet traffic that we are currently experiencing [1,2] is based on the expansion of cloud services and the huge amount of traffic supported by the content delivery networks (CDNs) [1]
A pool of agents emulates a realistic environment of a Disaggregated optical networks (DONs) data plane; those agents are implemented in docker containers and they are created automatically by the API gateway REST-based interface according to the topology specification given by ONOS
Once all the containers are up and running, the stage is to bind the containers to the proposed optical topology by sending the JSON configuration file via ONOS API
Summary
The rapid growth of Internet traffic that we are currently experiencing [1,2] is based on the expansion of cloud services and the huge amount of traffic supported by the content delivery networks (CDNs) [1]. SDN is becoming a consolidated technology for network management that encompasses a set of techniques aimed at the management of networks that focus mainly on one basic principle: decoupling the decisions made at the control plane with respect to the actions taken at the data plane [9]. This principle allows unprecedented degrees of flexibility in the system, because the network switches and routers become simple forwarding devices that send and receive traffic, while the logical control of the network can be centralized on an external controller [10]. Further details on the YANG/NETCONF usage for optical networks and additional alternatives for SBIs can be found in [19]
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