We’re excited to announce the release of Cumulus Linux 3.3! This product update was designed to enhance the performance and usability of your network. This release includes several enhancements to many existing features, like NCLU and EVPN, as well as brand new features, like buffer monitoring, PIM-SSM, 25G support and more, for increased reliability. The following paragraphs cover the key updates in this release.

Buffer monitoring

This new feature available on Mellanox hardware alerts for congestion & latency thresholds, helping you understand traffic patterns and model network operations based on buffer utilization data.

Ideal for customers using latency-sensitive apps such as for HFT, HPC and distributed in-memory apps, buffer monitoring will allow you to proactively detect congestion events that result in latency and jitter by monitoring traffic patterns to identify bottlenecks early and effectively plan for capacity.


Get source-specific multicast for more efficient multicast traffic segmentation and higher scalability.

Having intermittent sources is a common issue when market data applications are used as servers to send data to a multicast group and then go silent for more than 3.5 minutes. These intermittent sources may cause a high amount of state transitions on the network and can introduce packet loss during the window of time when hardware is being programmed and soft state is being created.

PIM-SSM is the first and best solution for intermittent sources. This optimization of the PIM protocol does not have any data-driven events in creating forwarding state. That means that as long as the receivers are subscribed to the streams, the network has the forwarding state created in the hardware switching path. Intermittent sources are not an issue with PIM-SSM.

Expanded hardware support

This release extends the support to our 25G portfolio with Quanta IX2. We’re now the only vendor with multi-platform, multi-silicon and open networking options to transition 25/100G. This new platform uses Atom Rangeley x86 as the CPU.

EVPN enhancements

Several updates were made to EVPN in order to optimize usage for cloud networks implementing L2 based network virtualization:

  • ARP Suppression: Avoid unnecessary flooding across VXLAN tunnels
  • Static/Sticky MAC: pin the host VM so it can’t move
  • NCLU Coverage: Simplify overall configuration and operation
  • Cisco NXOS Interop: Easily transition to Cumulus Linux from other vendors

NCLU enhancements

We have expanded NCLU even further to help make open networking easy and accessible to engineers of all backgrounds. This update adds coverage for DNS, NTP, Syslog, VRF, EVPN, 802.1X that will give network operators a single tool to configure and operate their Cumulus Linux switches. Users don’t have to remember multiple config files, syntax & semantics for different components. Read more about NCLU.

Support for Cumulus VX

Cumulus Linux customers using Cumulus VX can now access our support team. You can now get assistance with questions regarding testing and staging production rollouts by simply filing a support ticket.

Plus, we’ve added these early access features:

  • Facebook Backpack – now shipping to EA customers! Eliminate up to 128 cables and 256 optics, plus get shared power/cooling and improved reliability. This release offers customers early access to the Cumulus Express 10128, based on the Facebook Backpack. The Cumulus Express 10128 is the first open, modular chassis that comes pre-loaded with Cumulus Linux. Read more about Backpack.
  • VXLAN routing: Inter-Tenant/App Communication over shared L3 underlay. This is an efficient, robust and scalable solution for communicating between hosts across different VNIs.
  • Q-in-Q: Double .Q tagging (outer tag = customer, inner tag = service) for hybrid cloud connectivity.

You can try these 3.3 features for free on Cumulus VX.

To learn more about what’s new and improved, head to the release notes or contact your dedicated Cumulus Networks sales team