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.


    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. Which, in turn, means a more cost-effective solution for your business.

    The Junos OS ecosystem is built on a modular architecture. In addition to the base Junos OS, Service and Security features can be customized and loaded on demand on specific hardware platforms. This modularity helps all Junos OS products run efficiently with optimal resource utilization.

    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 that exemplify ease of use and operational agility.
    • Simple routing policy management for fine grained network traffic controls.
    • Architected with separate control and forwarding planes increasing reliability and security.
    • Flexible programmability with open APIs and protocols connecting with the Junos SDK, the Junos Space Management platform other third party automation / orchestration tools provide a customizable network infrastructure for service creation from the ground up.

    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