YANG/NETCONF ROADM: Evolving Open DWDM Toward SDN Applications

Abstract

Evolution in the field of optical networking in National Research and Education Networks led to utilization of Alien Wavelengths (AWs) and disaggregated Open Line Systems. Dynamic provisioning of AWs, in general spectrum services, is achieved via Reconfigurable Optical Add Drop Multiplexers (ROADMs) operating with flexible spectrum allocation. Northbound interface of these is usually implemented via the NETCONF protocol and through an appropriate Yet Another Next Generation (YANG) model. This paper presents a self-contained flexible spectral grid YANG model for low-level control and monitoring of a ROADM. The presented YANG model offers access to all functional components of a modern flexgrid ROADM and enables SDN applications to access and manipulate the media layer with no required external validation. The model is verified by an SDN application which implements optical path protection of AWs. A physical demonstration with model railroad intuitively shows the accomplished functionality.

Building a laboratory bench for the study of software-configurable network infrastructures

“…Наиболее плодотворной идеей из тех, что были предложены в рамках этой концепции, оказалось предложение о разделении процесса управления коммуникационным оборудованием на отдельные процессы управления (Control Plane) и обработки данных (Data Plane) [5]. Именно это разделение ускорило модификацию процесса управления компонентами сетевой инфраструктуры и привело к появлению целого семейства универсальных конфигурационных платформ (например, Ansible) [6], что, в свою очередь, сделало возможной модельно-ориентированную автоматизацию этого процесса [7]. Сегодня область внедрения технологий программного конфигурирования постоянно расширя-ется, захватывая все новые направления телекоммуникаций [8] и смежные IT-области, что позволяет говорить о программно определяемом конфигурировании как об универсальном подходе (Software-Defined Everything/Anything-SDx) [9], который задает современные направления развития информационных технологий.…”

Opening up ROADMs: Let Us Build a Disaggregated Open Optical Line System

“…Even a small increase to −24 dBm per channel at Line IN leads to EDFA saturation as its output power exceeds +21.5 dBm. 3 This highlights the importance of careful channel power equalization within a DWDM network, especially when utilizing all channels available in the C-band.…”

“…The remaining software on the box only ensures that these services remain available. The overall software architecture is reused from our earlier project [3].…”

“…In a similar manner to our earlier work [3], we did not want to design yet another incompatible YANG model. Since that time, the YANG-centric view of the OLS landscape [39] changed.…”

“…CESNET, a Czech research and education network, has been working on individual components of an OLS system under the Czech Light name since 2004 [2]. Originally starting with amplifiers, optical switches and specialty equipment, a fixed-grid ROADM [3] with NETCONF [4] northbound control interface was introduced in 2016.…”