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Cumulus Linux 4.0 Release Notes


 These release notes are now part of the Cumulus Linux User Guide. But, don't worry, we will continue to keep this page up-to-date until the release is no longer available.


These release notes support the Cumulus Linux 4.0.0 release and describe currently available features and known issues.

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What's New in Cumulus Linux 4.0

Cumulus Linux 4.0.0 contains the following new platforms, new features, and enhancements:

New platforms include:

  • EdgeCore Minipack AS8000 (100G Tomahawk3)
  • Mellanox SN3700C (100G Spectrum-2)
  • Mellanox SN3700 (200G Spectrum-2): Cumulus Linux 4.0.0 currently supports 100G speed
  • HPE SN2745M (100G Spectrum)

New features and enhancements include:

For complete details on the differences between Cumulus Linux 4.0 and Cumulus Linux 3.7, refer to this article.

Platform Support

Cumulus Linux 4.0.0 supports a limited number of platforms. For the current list, see this article.

Cumulus Networks is ending the sale of these platforms in Cumulus Linux 4.0:

  • Cumulus Express CX-10256-S/EdgeCore OMP-800 (100G Tomahawk)
  • Dell S6000-ON (40G Trident2)
  • EdgeCore Wedge-100 (100G Tomahawk)
  • Facebook Backpack (100G Tomahawk)

Cumulus Networks is ending support for the Facebook Voyager (100G Tomahawk) switch in Cumulus Linux 4.0.

Important: Do not install Cumulus Linux 4.0 on the platforms that are listed as end of sale or end of support; Cumulus Linux does not work correctly on these platforms.


Cumulus Linux is licensed on a per-instance basis. Each network system is fully operational, enabling any capability to be utilized on the switch with the exception of forwarding on switch panel ports. Only eth0 and console ports are activated on an un-licensed instance of Cumulus Linux. Enabling front panel ports requires a license.

After you receive a license key from Cumulus Networks or an authorized reseller, you can install the license. Follow the steps in the Cumulus Linux Quick Start Guide.

Install or Upgrade to Version 4.0

Whether you are installing Cumulus Linux 4.0 for the first time or upgrading from an earlier version, follow the steps in the Installation Management section of the Cumulus Linux User Guide.

Perl, Python and BDB Modules

Any Perl scripts that use the DB_File module or Python scripts that use the bsddb module do not run under Cumulus Linux 4.0.


You can read the technical documentation here.

Open and Fixed Issues in Cumulus Linux 4.0 

Change Log
Date Change
 November 19, 2019   4.0.0 release
 November 21, 2019   Added CM-27367 
 November 25, 2019   Added CM-27184 
 December 16, 2019   Added CM-24993 
 December 20, 2019   Added CM-27719, CM-27699, CM-27678, CM-27619, CM-27422, CM-27275 
 January 7, 2020   Added CM-27801 
 January 9, 2020   Added CM-27740 
 January 10, 2020   Added CM-27753 
 January 10, 2020   Added CM-26815 (fixed issue) 
 January 27, 2020   Added CM-27295 
 January 28, 2020   Added CM-28087, CM-28077, CM-28065, CM-27496 
 January 29, 2020   Added CM-28156 and CM-27299 
 January 30, 2020  Added CM-28119, CM-28076, CM-27999, CM-27957
January 31, 2020  Added CM-28191
February 5, 2020  Added CM-28226
March 2, 2020  Added CM-27586


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    Pete Lumbis

    Best release notes in the industry

This support portal has moved

Cumulus Networks is now part of the NVIDIA Networking Business Unit! The NVIDIA Cumulus Global Support Services (GSS) team has merged its operations with the NVIDIA Mellanox support services team.

You can access NVIDIA Cumulus support content from the Mellanox support portal.

You open and update new cases on the Mellanox support portal. Any previous cases that have been closed have been migrated to the Mellanox support portal.

Cases that are still open on the Cumulus portal will continue to be managed on the Cumulus portal. Once these cases close, they will be moved to the Mellanox support portal.

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