ONOS

ONOS is an open-source software-defined networking platform for engineering and operating programmable networks. It is best suited to teams that need a resilient controller across service-provider infrastructure, with data-center and campus networks also in scope. Choose it for its distributed design and broad control interfaces; look elsewhere if Kubernetes-based deployment is more machinery than your network needs.

Overview

ONOS provides a control plane between network applications and the devices they manage. Its north-facing abstractions let applications interact with network services, while its south-facing abstractions support device control across protocols. That makes ONOS a foundation for building network services, not a general-purpose tool for routine administration.

Its symmetric cluster of identical instances distributes work and is designed to withstand instance failures. The µONOS architecture describes high availability and dynamic scaling, which matter when control-plane continuity and capacity are important. The trade-off is operational commitment: µONOS microservices are designed for cloud and data-center infrastructure, with Kubernetes as the deployment environment.

Key features

• Network operations: µONOS supports device configuration, monitoring and maintenance, forwarding-plane programming, topology validation, and detailed performance metrics. This breadth suits teams that need to operate and program a network from the same control plane.
• Control interfaces: P4/P4Runtime, gNMI/OpenConfig, and gNOI provide routes to modern device configuration and control; gRPC connects the modular microservices. ONOS documentation also identifies OpenFlow as its primary southbound protocol, alongside OVSDB, NETCONF, and SNMP for configuration. The range supports mixed protocol environments, though teams still need expertise in the interfaces they adopt.
• BGP connectivity: The SDN-IP application enables an ONOS-controlled network to exchange traffic with adjacent external networks using BGP, a practical fit when the SDN domain must connect to existing networks.
• Web GUI and deployment: The cloud-native GUI uses Angular and gRPC Web to access backend modules. Docker images and Helm charts support Kubernetes deployment; production downloads include a release tar.gz package or Docker image, while source-repository access is aimed at development.
• Access control: Security Mode is intended to restrict application access to northbound APIs, useful where applications should not all have the same reach into network control.

Pricing

ONOS is free: the ONOS plan costs nothing and is open-source software under the Apache License 2.0. There are no paid tiers or seat-based limits described. The cost advantage does not remove the work of running and maintaining the required infrastructure, particularly for Kubernetes-based µONOS deployments.

The downloads page identifies X-Wing 2.7.0, dated July 16, 2021, as an LTS release. Teams choosing a production release should weigh that release information when planning their own deployment and maintenance approach.

Platforms

ONOS supports API, Linux, macOS, self-hosted, and web environments. Its listed network-control technologies include P4Runtime, gNMI/OpenConfig, gNOI, and OpenFlow. The GUI is a Kubernetes cloud-native application, so web access does not make the platform a hosted, turnkey network service.

Who it's for

ONOS is most compelling for service-provider network teams building or operating an SDN control plane, particularly when distributed operation, protocol breadth, and programmable forwarding are central requirements. Data-center and campus operators can also consider it. It is a poor match for small networks seeking a simple management interface or teams unwilling to operate Kubernetes-based infrastructure.

Pros and cons

• Pro: A symmetric distributed cluster is designed to spread work and handle instance failures, supporting networks where controller resilience matters.
• Pro: Support for device operations, forwarding-plane programming, topology validation, and performance metrics covers both control and operational visibility.
• Pro: P4/P4Runtime, gNMI/OpenConfig, gNOI, OpenFlow, and additional configuration protocols give network teams multiple ways to integrate with devices.
• Con: µONOS is designed around Kubernetes microservices, making deployment and operations a substantial commitment compared with a conventional network-management application.
• Con: Its role as an SDN control plane means teams looking for a ready-made tool for basic network administration may be taking on unnecessary complexity.

Alternatives

• OpenDaylight is another free open-source SDN platform, with downloadable tar or zip packages and Docker images; consider it when that platform is a better fit for your SDN deployment.
• Antrea is free under Apache License 2.0 and requires a Kubernetes cluster and Open vSwitch kernel module on every Kubernetes node. It may suit teams focused on Kubernetes networking with those prerequisites.
• Cilium is a free, open-source option for Linux and self-hosted environments, requiring Linux kernel 5.10 or equivalent on AMD64 or AArch64.
• Kube-OVN is a free Apache-2.0 Kubernetes networking project for API, Linux, and self-hosted environments.
• Open Virtual Network is a free, open-source Apache 2 option for Linux and self-hosted environments.
• .NET is an open-source alternative with a free plan at no cost for up to 1,000 nodes, alongside subscription-based billing for certain Azure Virtual Network Manager instances.
• VMware Workstation Pro is free at no cost, with no subscription or license key required, for 64-bit Intel or AMD PCs running Windows or Linux hosts.
• TP-Link Omada Cloud-Based Controller offers a lifetime-free plan with unlimited devices and sites and core management features for compatible Omada access points and managed switches.

Verdict

Choose ONOS if you need an open-source, distributed SDN control plane with broad device interfaces and can support its Kubernetes-oriented architecture. Its strongest reason to choose is the combination of fault-tolerant design and programmable network operations; its strongest reason to look elsewhere is the operational overhead for teams that do not need a specialist control plane.