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3 authors Adding SDKLT-based BcmSdkWrapper (#2)
* Add SDK wrapper for SDKLT
* Fixes to BcmSdkWrapper
  - Fix SDKLT Bazel rules
  - Initialize SDKLT CLI correctly
  - Remove manual priority splitting from bcm_flow_entry
  - IPv6 handling & rxpmd header fixes
  - Implement ConfigureVlanBlock and ConfigureL2Learning
  - Fix knet unregister on shutdown
  - Replace ad-hoc basename function with utils version
  - Fixes a memory leak from un-free'd strdup()
  - Remove VLAN config from KNET interface
  - Implement gNMI interface packet counter for BCM target
  - Allow empty eth dest match in L2MulticastEntry
  - This cleans up the log from non-errors messages, that are handled by alternative code paths.  The code can still log them explicitly.
  - Set correct opcode in RCPU header
* Use ONF SDKLT build
* Fix encoding of P4RT unsigned byte strings
* Update stratum_bcm README
* Fix InUseMap helper functions
* Simplify CheckIfPortExists API
* Add FindIndexOrNull function

Co-Authored-By: Maximilian Pudelko <>
Co-Authored-By: Yi Tseng <>
Co-Authored-By: Brian O'Connor <>
Latest commit 1df98b6 Oct 18, 2019

stratum logo

Stratum - Enabling the era of next-generation SDN

Copyright 2018 Google LLC
Copyright 2018-present Open Networking Foundation

Stratum is an open source silicon-independent switch operating system for software defined networks. It is building an open, minimal production-ready distribution for white box switches. Stratum exposes a set of next-generation SDN interfaces including P4Runtime and OpenConfig, enabling interchangeability of forwarding devices and programmability of forwarding behaviors. Current support includes Barefoot Tofino and Broadcom Tomahawk devices, as well as the bmv2 software switch.

Build status (master): CircleCI codecov


Running Stratum





Stratum inside Docker

Other Topics



PHAL Development Tutorial

PHAL DB Configurators




Component Overview


P4Runtime provides a flexible mechanism for configuring the forwarding pipeline on a network switch.

gNMI is a framework for network device management that uses gRPC as the transport mechanism.

SDKLT is used to program fixed-pipeline switches using the Tomahawk chip from Broadcom.

Supported Devices


  • Delta AG9064v1

  • Edgecore Wedge 100BF 32x

  • Edgecore Wedge 100BF 65x

  • Inventec D5254

  • Stordis BF6064X


  • Edgecore AS7712-32X

  • Dell Z9100

  • Inventec D7032

  • QCT QuantaMesh T7032-IX1

Software Switches

  • bmv2

  • dummy

Source code

This repository contains source code for a reference implementation of the P4Runtime and gNMI services, that serves as the hardware abstraction layer for a network switch. It has been successfully prototyped at Google, running on production hardware on a data center network subsystem.

Development environment

We provide a script to create a Docker development environment for Stratum.

To start the container, run the following in your stratum directory:


The script will build a Docker image using and run a bash session in it. This directory will be mounted in the Docker image and you will be able to run git, edit code, and build Stratum / run tests using Bazel.

For more information, you can see a complete list of arguments by running: -h

If you are using Docker on Linux, make sure that you can use Docker as a non-root user, otherwise you will not be able to run

sudo usermod -aG docker $USER
You can’t perform that action at this time.