Chassis User Guide

The Cumulus Express chassis is a self-contained Clos network in a single chassis form factor. The chassis available currently is the Cumulus Express CX-10256-S chassis, also known as the Edgecore OMP-800 chassis.

The chassis is like a 16 leaf/8 spine Clos network in a single 10RU housing. The chassis comprises a number of components. The components pertinent to this guide are:

  • 8 line cards, each with 2 Tomahawk ASICs, 2 Intel Atom C2538 4 core 2.40GHz CPUs, and 32 100G fabric ports. The line cards are similar to leaf switches in a Clos network. Each line card runs 2 instances of Cumulus Linux, one for each ASIC. In the image below, the line cards are in the middle of the chassis, flanked by two fabric cards on each side. Line card 1 is at the top of the image and line card 8 is at the bottom.
  • 4 fabric cards, each with 2 Tomahawk ASICs, 2 Intel Atom C2538 4 core 2.40GHz CPUs, and 32 100G fabric ports. Fabric cards are similar to spine switches in a Clos network, although the fabric cards do not connect to nodes outside the chassis. Each fabric card runs 2 instances of Cumulus Linux, one for each ASIC. The fabric cards flank the line cards in the image below. Fabric card 1 is the leftmost card and fabric card 4 is the rightmost card.
  • 16 fan modules, accessible from the rear.
  • All line cards, fabric cards and power supplies are accessible from the front.
  • All CPUs are located on their respective line or fabric cards. There are no chassis management modules (CMMs), system control modules (SCMs) or baseboard management controllers (BMCs).

In addition, the chassis contains horizontal and vertical control planes, a bus bar assembly, a fan control board, 6 power supply units (PSUs) and a power distribution board (PDB), but this is all beyond the scope of this guide.

The chassis fits into a 21” rack that is 10 RU in height.

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