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Cumulus Networks

Cumulus Networks was an computer founded in and headquartered in , that specialized in developing open networking operating systems for switches and routers, enabling disaggregated hardware and software to support web-scale and enterprise cloud environments. The company's flagship product, Cumulus Linux, is a Debian-based optimized for , providing full access to tools, capabilities, and support for over 100 switch platforms from various vendors, which facilitated scalable, programmable networks for , high-performance computing, and cloud s. Cumulus Networks also offered complementary solutions like Cumulus NetQ, a telemetry and validation tool for monitoring and troubleshooting of large-scale fabrics, emphasizing an automation-first approach to reduce operational costs and enhance . These innovations positioned Cumulus as a in open networking, decoupling software from proprietary hardware to promote flexibility and vendor neutrality in deployments. In May 2020, NVIDIA announced its acquisition of Cumulus Networks to integrate its software expertise with 's hardware portfolio, including Mellanox Spectrum Ethernet switches, thereby strengthening end-to-end solutions for accelerated computing and software-defined infrastructure. The deal, which closed later that year, marked a significant milestone in 's expansion into networking software, allowing and related technologies to evolve within 's ecosystem while maintaining open-source principles.

History

Founding and Early Years

Cumulus Networks was founded in January 2010 in , by JR Rivers and Nolan Leake, both of whom had prior experience at through acquisitions of their previous employers. Rivers, who served as the initial CEO, had joined in 1995 following its acquisition of Grand Junction Networks, where he advanced to distinguished engineer roles over a decade. Leake, who became CTO, had worked at and joined via its 2008 acquisition of Nuova Systems, contributing to the development of the NX-OS operating system. The founders were driven by the recognition that traditional proprietary networking hardware and software were becoming obsolete in cloud-scale data centers, seeking to apply principles to create a disaggregated model separating switch hardware from the operating system. The company operated in for its first three years, focusing on developing a Linux-based to enable commodity hardware usage in enterprise environments. In 2011, Cumulus secured seed funding from investors including and , providing the resources to build its core technology. This early investment supported the team's efforts, drawing on expertise from former engineers at and to innovate in networking and . Cumulus emerged publicly in June 2013, announcing as the industry's first open network operating system designed for commodity switches, aiming to disrupt the dominance of vendor-locked solutions. The launch positioned the company as a pioneer in open networking, allowing operators to deploy on off-the-shelf hardware for greater flexibility and cost efficiency. Rivers led the technical and strategic development during this period, guiding Cumulus through its initial growth as an independent startup. In June 2019, co-founder JR Rivers departed as CTO after nearly a decade, having overseen the technical foundation of the company's offerings. His exit marked the end of the founding era, though Cumulus continued to build on the open networking vision established in its early years.

Growth and Partnerships

Cumulus Networks experienced significant expansion from 2014 to 2019, driven by strategic funding rounds that supported its development of open networking solutions. In January 2014, the company raised $36 million in Series B funding led by , following an earlier $15 million in 2012. This was followed by a $35 million Series C round in January 2016 from investors including and . By January , Cumulus secured $43 million in Series D funding anchored by Ventures, bringing total funding to $129 million and enabling broader in the open networking . Key partnerships with major hardware vendors accelerated Cumulus's adoption by integrating its Linux-based (NOS) with commodity switches. In 2014, partnered with Cumulus to offer Cumulus Linux pre-installed on its Networking S-series switches, marking an early milestone in disaggregated networking. (HPE) followed in February 2015, announcing support for Cumulus Linux on its Altoline open networking switches to target web-scale data centers. In March 2016, Mellanox collaborated with Cumulus to certify and ship Spectrum ASIC-based Ethernet switches running Cumulus Linux, enhancing high-performance open networking options. Lenovo joined in December 2018, integrating Cumulus Linux and NetQ into its ThinkSystem NE series RackSwitches for scalable, open data center deployments. Market adoption grew rapidly, with Cumulus Linux powering networks for web-scale operators and enterprises seeking alternatives to proprietary systems. By 2017, approximately 32% of 50 companies had adopted Cumulus technology, reflecting its appeal for large-scale, cost-effective networking. The company focused on hyperscale environments, enabling and scalability for high-volume data centers, with notable implementations at organizations like and . This growth underscored Cumulus's role in shifting the industry toward open, Linux-based networking standards. Under leadership emphasizing innovation, Cumulus drove the transition from proprietary NOS to flexible, community-driven solutions. Co-founder JR Rivers, who served as CEO from the company's founding until 2016 and then as CTO until mid-2019, oversaw expansions in partnerships and customer base, while co-founder Nolan Leake contributed as CTO until 2016, focusing on technical architecture to support the open networking movement.

Acquisition by NVIDIA

On May 4, 2020, NVIDIA announced its agreement to acquire Cumulus Networks for an undisclosed sum, with estimates placing the deal value between $1 billion and $1.5 billion. The transaction was completed in June 2020, shortly after NVIDIA finalized its $6.9 billion acquisition of on April 27, 2020, enabling a unified approach that merged Cumulus' software innovations with Mellanox' hardware for comprehensive end-to-end networking solutions in data centers. The strategic rationale behind the acquisition centered on strengthening NVIDIA's position in , particularly for accelerating and workloads in data centers. Cumulus' expertise in networking software, including Linux-based operating systems for switches, complemented Mellanox' Ethernet and hardware offerings, allowing NVIDIA to optimize the full networking stack from chips to analytics. This move built on prior collaborations between Cumulus and Mellanox dating back to 2013, which had already integrated their technologies in joint solutions. Following the acquisition, Cumulus' technologies were integrated and rebranded under NVIDIA's Networking portfolio, with ongoing development of key products such as Cumulus Linux and NetQ to support enterprise and cloud environments. No significant layoffs were reported during the transition, preserving the engineering talent that drove Cumulus' innovations. As of 2025, Cumulus operates as a fully integrated component of NVIDIA's open networking division, contributing to software solutions optimized for and workloads, including Ethernet switching platforms like Spectrum-X that enhance performance in accelerated data centers.

Products

Cumulus Linux

Cumulus Linux is an open (NOS) designed specifically for networking, providing a Linux-based platform that enables operators to manage switches using familiar Linux tools and practices. It was originally developed by Cumulus Networks and, following the company's acquisition by in 2020, has evolved into a key component of NVIDIA's networking portfolio, supporting high-performance Ethernet fabrics in modern s. As a full-featured Debian-based distribution—currently built on Debian Bookworm—Cumulus Linux optimizes the for networking workloads, allowing for seamless integration with standard server management techniques while abstracting underlying switch hardware complexities. At its core, Cumulus Linux employs a modular architecture centered on the Switchd daemon, which serves as the layer (). Switchd communicates directly with the switch ASIC to accelerate networking constructs, such as routing tables and tables, in hardware, enabling efficient forwarding without proprietary . This design supports bare-metal switches from multiple vendors, including and HPE, as certified in 's Hardware Compatibility List (HCL), which ensures across platforms equipped with compatible ASICs like or Spectrum. Key features include robust Layer 2 and Layer 3 switching capabilities, with support for protocols like BGP and OSPF integrated via the (FRR) suite for . Automation is facilitated through tools such as and for , while the User Experience (NVUE) command-line interface (CLI) provides an object-oriented model for intuitive, programmable network setup. Additionally, Cumulus Linux supports , allowing Engine to run directly on switches for deploying networked applications in isolated environments. The evolution of Cumulus Linux began with its initial release in 2013, introducing a Debian-based NOS tailored for open networking on white-box . A major milestone came with version 4.0 in 2019, which added support for the Switchdev driver model to enhance hardware offloading and integration for improved and scalability. Post-acquisition by , the 5.x series—starting around 2020 and continuing through versions like 5.15 in 2025—shifted focus to Spectrum-based platforms, incorporating AI-optimized for real-time network insights and advanced analytics. These updates emphasize (LTS) branches, such as 5.9.z and 5.11.z, providing up to three years of maintenance to align with enterprise deployment cycles. Cumulus Linux promotes the "networking like Linux" paradigm, facilitating hardware-software disaggregation that decouples NOS choice from switch vendors, thereby fostering and flexibility in designs. It has seen widespread adoption in hyperscale environments, such as those operated by major cloud providers, where it enables spine-leaf topologies and overlay networks like EVPN-VXLAN for massive scalability. By leveraging open standards and ecosystems, deployments with Cumulus Linux achieve significant cost reductions compared to systems, including up to a 57% decrease in (TCO) through lower capital expenditures (by approximately one-third) and operational efficiencies like a 75% reduction in operator-to-switch ratios, according to a 2017 whitepaper. This has made it a staple for organizations seeking web-scale performance without the premiums of integrated vendor solutions.

NetQ

NetQ is a network operations toolset developed by Cumulus Networks and now maintained by , designed to provide real-time visibility, troubleshooting, and validation for Cumulus Linux-based fabrics. Introduced in 2017 as a -based system for fabric validation, it enables operators to monitor overlay and underlay , detect anomalies, and ensure operational integrity across data centers. Core functionalities include -wide visibility through streaming , event-driven alerts sent via integrations such as and , interactive topology mapping via a that visualizes connections and information, and compliance checks that validate configurations against blueprint files in formats like or . These capabilities help maintain health by identifying issues like inconsistent VLAN-to-VXLAN mappings or deviations before they impact performance. Technically, NetQ deploys lightweight agents on switches and hosts to collect and stream data, supporting seamless upgrades through its Lifecycle Management (LCM) module, which automates restoration and deployment. Users interact with the via a (CLI) for detailed queries or a (GUI) for visual analysis, including snapshot comparisons and flow . The tool scales to large environments, with high-availability clusters supporting up to 2,000 switches and 250,000 interfaces in a 5-node setup, making it suitable for expansive operations. It also integrates with NVIDIA's What Just Happened (WJH) feature on ASICs for hardware-accelerated , enhancing rapid issue resolution. Since its acquisition by in 2020, NetQ has evolved with regular updates, reaching version 5.0 by 2025, which refines event notifications and validation summaries while adding beta support for dashboards via OpenTelemetry. Earlier enhancements, such as version 4.15 in 2024, improved topology validations and streamlined on-demand checks. In use cases like fabrics, NetQ reduces by providing actionable insights into fabric health, optimizing RoCE , and integrating with BlueField DPUs for accelerated processing in environments. This positions it as a key enabler for reliable, low-latency networks in -driven data centers.

Host Pack

Host Pack is a software extension developed by Cumulus Networks, now part of , that extends the capabilities of to server hosts, enabling advanced networking for containerized and microservices-based applications. Launched on August 23, 2017, it addresses key challenges in container networking by providing a unified Linux-based operating model that integrates host and network operations. This allows organizations to deploy consistent networking tools across infrastructure, reducing silos between application developers and network operators. The primary purpose of Host Pack is to deliver Layer 3 (L3) connectivity for containers, facilitating scalable and predictable communication in dynamic environments. Key features include support for FRRouting (FRR) and BGP unnumbered peering to simplify IP management and enable dynamic learning of container endpoints for IP address distribution. It incorporates NVUE (NVIDIA User Experience), a declarative configuration tool, for streamlined host networking setup, allowing users to manage interfaces, routes, and policies through a single CLI or API. For high-performance scenarios, Host Pack supports SR-IOV (Single Root I/O Virtualization) and VFIO (Virtual Function I/O) to bypass kernel overhead and achieve near-native network speeds in container workloads. Integration with container runtimes is achieved via compatibility with Docker and Kubernetes Container Network Interface (CNI) plugins, enabling seamless attachment of host networking to pods and containers. In terms of architecture, Host Pack deploys select Cumulus Linux components directly on server hosts, creating a Layer 3 fabric that extends from switches to endpoints without relying on complex Layer 2 overlays. This design promotes multipathing for reliability and eliminates traditional broadcast domains, while maintaining compatibility with orchestration platforms like and . Following NVIDIA's acquisition of Cumulus Networks in 2020, enhancements in the have focused on cloud-native applications, including deeper with NVIDIA's accelerated ecosystem for improved in hybrid and multi-tenant deployments. As of 2025, Host Pack offers support subscriptions up to five years, ensuring long-term stability for enterprise environments. Host Pack delivers benefits such as predictable performance through hardware-accelerated paths and reduced operational complexity in multi-tenant setups, where containers require isolated yet efficient connectivity. Enterprises leverage it for hybrid networking, combining on-premises hosts with resources while using tools like NetQ for visibility. Cumulus Networks had over 500 customers running its software in production at the time of Host Pack's launch, a number that has grown with NVIDIA's ecosystem, supporting web-scale operations.

Open Source Contributions

Open Network Install Environment (ONIE)

The Open Network Install Environment (ONIE) is a small operating system designed as pre-installed on bare-metal network switches to standardize the installation of network operating systems (NOS). Initiated by Cumulus Networks in 2012, ONIE functions as a UEFI-based that automates the provisioning process, allowing users to install compatible NOS options such as Cumulus Linux without vendor-specific tools. It supports GRUB2 as the boot loader, enabling multi-OS environments by facilitating the selection and installation of different operating systems during the boot sequence. Key features of ONIE include hardware discovery, which automatically detects switch components and network interfaces to streamline installation, and secure boot capabilities that verify the integrity of the bootloader and subsequent NOS images using UEFI's database of authorized public keys. These features ensure a secure and standardized installation process across diverse hardware. ONIE is compatible with over 100 switch models from multiple vendors, including Accton (e.g., AS5610 series) and (e.g., Z9100-ON and S5200F-ON series), supporting a wide range of and architectures. ONIE's impact lies in its promotion of an open networking ecosystem, adopted by the (OCP) in 2013, which enables the "choose your OS" model by decoupling hardware from and reducing the need for multiple hardware SKUs in manufacturing. This fosters scalability and choice for operators. Following NVIDIA's acquisition of Cumulus Networks in 2020, ONIE has continued to be maintained by the OCP community, with ongoing updates for new ASICs; notable milestones include its initial presentation at the OCP symposium in May 2013 and the release of version 2025.08 in August 2025.

FRRouting (FRR)

FRRouting (FRR) is an open-source IP routing protocol suite originally forked from in 2017 by a team led by Cumulus Networks engineers, along with contributors from 6Wind and BigSwitch Networks, to accelerate development and address the stagnation in Quagga's progress. The project was officially announced and welcomed into the in April 2017, providing a neutral governance structure for its ongoing evolution. FRR supports key dynamic routing protocols including BGP, OSPF (versions 2 and 3), and , enabling robust unicast and multicast routing capabilities. Its design ensures multi-vendor compatibility by integrating seamlessly with and Unix IP stacks, making it suitable for diverse hardware from white-box switches to virtual environments. Since 's acquisition of Cumulus Networks in 2020, engineers have continued to lead FRR's core development, contributing significantly to features like EVPN and VXLAN support, which were prioritized early in the project's to facilitate overlay networking in centers. These enhancements, introduced in FRR version 4.0, allow for scalable Layer 2 and Layer 3 VPN services over BGP, improving interoperability in multi-tenant environments. FRR is hosted under the Foundation's umbrella, fostering collaboration among over 400 committers as of 2020, with ongoing contributions driving performance improvements and protocol extensions. In Cumulus Linux, FRR serves as the default routing stack for , powering protocol daemons that manage BGP, OSPF, and to enable efficient path selection and in fabrics. This integration supports large-scale deployments by handling full routing tables and facilitating features like equal-cost multipath (ECMP) for load balancing traffic across links. Recent updates, such as FRR 10.4 released in July 2025 with -led optimizations for BGP EVPN processing and large-scale ECMP, enhance scalability for hyperscale networks. Beyond Cumulus ecosystems, FRR has broad community impact, serving as the primary routing protocol suite in projects like SONiC, where it underpins BGP-based control planes for open networking switches. Its adoption extends to other initiatives, including early open switch platforms, with contributor numbers exceeding 50 active participants as of 2025, reflecting sustained growth in cloud and enterprise use cases.

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