Junos OS

Network operating system for routing, switching, and security

Simplicity and innovation—they’re what make Junos® operating system so unique. Junos OS is the common language running across our routing, switching, and security devices.

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    Junos OS


    Junos OS is a reliable, high-performance network operating system for routing, switching, and security. It reduces the time necessary to deploy new services and decreases network operation costs. Junos OS offers secure programming interfaces and the Junos SDK for developing applications that can unlock more value from the network.

    Running Junos OS in a network improves the reliability, performance, and security of existing applications. It automates network operations on a streamlined system, allowing more time to focus on deploying new applications and services. And it’s scalable both up and down, providing a consistent, reliable, stable system for developers and operators. This, in turn, means a more cost-effective solution for your business.

    Junos OS is architected with DevOps in mind. With versatile scripting support and integration with popular orchestration frameworks, Junos OS offers flexible options for continuous delivery and DevOps style management. The Junos Continuity features further enhance continuous delivery and efficient software re-qualification.

    Software-Defined Networks (SDN)

    Junos OS provides programmability and controls for SDN through a rich set of protocols and application programming interfaces (APIs). SDN solutions enable automation and orchestration of highly scalable service provisioning alternatives giving service providers increased business agility and the power to create new offerings.


    With Junos Fusion, service providers can reduce network complexity and operational costs by collapsing underlying network elements into a single, logical point of control from Junos OS routing platforms. Junos Fusion is fully interoperable with third-party solutions and is extensible to SDN control.

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    • One operating system reduces time and effort to plan, deploy, and operate network infrastructure.
    • One release train provides stable delivery of new functionality in a steady, time-tested cadence.
    • Modular software architecture provides highly available and scalable software that keeps up with changing needs.
    • Meaningful configuration hierarchies together with annotations, commit check, commit and rollback features exemplify ease of use and operational agility.
    • Simple routing policy management supports fine-grained network traffic controls.
    • Separate control and forwarding planes increase reliability and security.
    • Designed for DevOps, Junos Continuity aids continuous delivery, zero downtime, and vastly reduced re-qualification times when introducing new line card or chassis upgrades.

    Gearing Up to Reduce Data Center Downtime by 33%

    The PEER 1 Case Study

    PEER 1 Hosting Runs One of the Most Efficient Data Centers in the U.K.

    PEER 1 Hosting decided to improve energy, operations, and management efficiency by migrating from a shared to a dedicated infrastructure. It built its own state-of-the-art data center to achieve those goals, leveraging the power and simplicity of Junos operating system to reduce the time required to plan, deploy, and operate its network and security infrastructure.

    Read the case study