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Stratum is an open source, silicon-independent switch operating system for software-defined networks

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Next Generation SDN Interfaces

Enabling full lifecycle control and automated network management

  • Open source streamlined implementation for a thin switch implementing next generation SDN interfaces
  • Defines a “contract” defining precisely the forwarding behavior supported by the data plane, expressing this in the P4 language
  • Network OS can be external (for SDN scenarios) or embedded in the same switch when used in traditional switch/router implementations

Supports full lifecycle control and management, including:

  • Configuration
  • Control
  • Operations
  • Optional forwarding pipeline programmability
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Stratum is designed to support a variety of use cases including:

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Leverage Stratum in Custom SDN Networks.  Google is committed to production deployment of Stratum leveraging this use case.


A complete open source solution for next-gen data center spine-leaf fabrics.

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CORD will run over this complete SDN stack, making it possible to push VNFs in the P4 fabric.


Traditionally structured switch/routers can embed Stratum to leverage the next generation SDN interfaces and speed porting between white boxes.

Cloud Providers

Telecom Operators

Networking Vendors

White Box ODM Vendors

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Silicon Vendors

Other Open Source Projects

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The Stratum project is in its incubation phase during which the source code repository is open only to members.

To join the project, a minimum commitment of one full time engineering (FTE) resource is required. For more information or to let us know how you would like to contribute, please fill out the contact form.

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