This paper mainly studies the generation and composition of SNN unified controller based on ONOS architecture. The advantages of ONOS open source control platform are illustrated by the example of transmission Ethernet service line issuance. Starting from the characteristics of ONOS, this paper expounds that ONOS is suitable for operators’requirements for open source controllers. It has the characteristics of high scalability, high performance, high real-time and high reliability.
Operators can flexibly carry out business collaboration and low-cost business innovation. Under the circumstance of exponential growth of network traffic and weak economic growth, it is urgent to reform network architecture. With the introduction of SDN/NFV network architecture and the development of open source controller platform, a series of unified controllers represented by ONOS have been promoted, which provides operators with a new idea of network application. New technology.
Currently, operators are facing the transformation of network. They are working on new technologies (5G), new networks (SDN/NFV, CLOUD) and new ecological New Ecosystem (Open Sourse, Open Colibaoration) to build new capabilities of digital services. Promote the network architecture from “voice and data as the core” to “content and flow as the core”, thus introducing SDN and NFV two core technologies, building a new data center, realizing the virtualization and cloud of network functions: building a new network, so as to achieve network flexibility, intelligent scheduling and network capacity opening. In terms of new networks, it is urgent to promote commercial research on SDN, NFV and other technologies. ONOS: The originator of SDN is ONOS, which was founded in the United States in 2011.
The ONOS ecosystem is mainly composed of ON. Lab, which includes the founders of SDN, as well as leading network operators and network communication providers in the world. ONOS Controller is an open source commercial controller based on ONOS created by a non-profit organization called Open Network Laboratory (ON Lab). It aims to provide high availability, lateral scalability and high performance network requirements for service providers and enterprise backbone networks. Unified network resources and network element model of ONOS lay the foundation for the interoperability of third-party SDN applications. The standardization of ONOS north-facing interface can help operators integrate a large number of third-party SDN applications. Its unified south-facing API interface can help operators introduce third-party device drivers and avoid manufacturers’lock-in.
A variety of North-South agreements support both existing and future general-purpose equipment, protect existing investments and ensure that the architecture is future-oriented. The system hierarchy of ONOS is shown in Figure 1. The system level of ONOS is divided into protocol layer and adaptation layer dealing with network elements: protocol-insensitive ONOS Core layer to manage network status and resources; application layer to consume the unified northbound interface provided by Core layer; ONOS subsystem: including components and services, component characteristics: modularization, openness, abstraction, simplicity; ONOS cluster has four cluster settings. Accounting features: distributed, symmetrical, fault-tolerant and resilient scalability, location transparency; ONOS core features: distributed core: support cluster / distributed storage, high performance reliability, scalability. Unified Modeling of Network Resources: SDN abstract resource management “micro-kernel”, decoupling APP and southward protocol, unified resource management and better meet the interoperability of APP: open source of North-South model: conducive to the formation of factual standards, better interconnection. In general, the distributed framework is adopted, and the network Core is in the middle.
The left half of the system framework includes distributed communication, distributed lock and distributed DB.
Model driven framework. YANG TOOLS. is also available through IT Ecology. The right half is the basic network model, using ONOS Core code.
Network topology services include resource management, equipment management and tunnel management. Form the foundation of network application. Architectural advantages of ONOS Unified Controller: Unified, Unified Controller Platform, E2E-wide network scenario, flexible combination and deployment of functions and products: Open ONSO-based, ODL-friendly: Seamless docking of ONOS/ODL compatible northbound and southbound transponders: High performance/scalability based on cloud distributed architecture, supporting controller Federation Layered deployment, strong support network expansion and processing performance improvement: high reliability, through multi-level mechanisms to ensure high reliability, support cluster reliability and disaster preparedness in different places. With the exponential growth of network traffic, the transmission network is facing more and more challenges, mainly including: the functional components in the network are discrete off-line, based on solving single-point problems, insufficient in real-time and scalability, and difficulties in data interchange; huge network scale, complex network management, thermostatic element high equipment costs, and upgrading difficulties. Maintenance costs are high; it is difficult to cooperate among transmission networks of different manufacturers, data networks and transmission networks, and the end-to-end management and maintenance of services are complex; multi-layer networks can not be unified control, multi-layer services can not be flexibly scheduled, and network adaptability is poor. To solve the above problems, SDN (T-SDN) solution of transport network is introduced. By introducing centralized network control, a more open, flexible and dynamic network is constructed. Automation. AC-T centralized controller unified control, all tools/software organic connection, data sharing, good interoperability, good scalability, real-time online solution to all kinds of network problems. Virtualization. Through virtualization and abstraction of access network equipment, unified management, reduce equipment costs. Support one-click upgrade, reduce maintenance costs. Coordination. The end-to-end service automation control and resource optimization can be achieved through collaboration between different transmission networks, data networks and transmission network controllers. Elasticity. Multi-level self-negotiation can automatically adjust the services of different layers to improve network adaptability. To open up.
Provide a standard northbound interface to quickly provide OSS integration or support which good open third-party automation service components. The overall architecture uses AC-T centralized controller to complete network operation and maintenance, multi-domain management and other functions, to quickly meet the flexible and changeable needs of customers.
The T-SDN solution architecture is shown in Figure 3. T-SDN architecture The whole T-SDN solution architecture can be divided into three levels from bottom to top to realize the management and control of the whole network. The physical device layer is in the transport network, and the physical device layer is the transport network equipment. It is responsible for providing the basic information of the network to the AC-T controller and handling the operation request of the AC-T to the network equipment. The centralized control layer AC-T is the key part of the solution. It transfers more and more equipment functions to the centralized controller, implements centralized monitoring and control of the network through the south-facing interface, and realizes network abstraction and customization services by the north-facing interface. NMS network management system is responsible for the basic configuration operation of network and AC-T, including communication interface, controller backup and so on. Controllers in other fields refer to AC-T of other types of network devices. For example, in data networks, domain controllers are AC-T for data. Multi-domain synergist is responsible for the cooperation of multiple AC-T of the same or different fields and equipment manufacturers, realizes the communication among multiple centralized controllers, and completes the end-to-end management and control of the whole network for operators. Application layer is an application platform based on centralized controller. Users can control and manage the network through a graphical application interface. Moreover, through the open northbound interface, third-party vendors can also develop rich applications based on the SDN platform. One is that the App application of equipment manufacturer provides customized service for customers through the north-facing interface and AC-T interaction. Second, third-party APP application customers can access the required services through their own openness, and interact with AC-T through the northbound interface.
T-SDN adopts hierarchical controller architecture to achieve centralized management and control of multi-domain network, optimizes the allocation of network resources through advanced algorithms, and constructs an open ecosystem through standard API. T-SDN is committed to build a next-generation transmission network for future cloud-oriented operators to meet the needs of enterprise-to-enterprise dedicated lines, enterprise-to-cloud dedicated lines and numbers. According to a variety of business scenarios, such as the interconnection of the center to the data center, open source and throttle for operators. Transport Ethernet dedicated line is based on elastic bandwidth and AC-T controller.
Users can adjust the bandwidth of transport Ethernet dedicated line flexibly, and order bandwidth according to demand. At the same time, they can choose the optimal service path based on delay strategy. Starting from the network transformation of operators, this paper expounds that the future development of operators is a network based on SDN/NFV cloud. From broadband access of network architecture to ultra-wideband flexible pipeline to cloud application access service, SDN technology tends to the unification of ONOS controllers, and explains the advantages and applications of ONOS unified controller, which conforms to the times.
Open cooperation and open source innovation. Thus, it opens a new chapter in the network architecture of operators.