Arista DCS-7812R3-FM | 7800R3 Fabric Module for DCS-7812 Chassis

Q: How many DCS-7812R3-FM fabric modules are required for a DCS-7812 chassis?
A: Six DCS-7812R3-FM fabric modules are required to fully populate the fabric slots (1-6) in a DCS-7812 chassis. All six modules must be installed for proper operation.

Q: Is the DCS-7812R3-FM compatible with other Arista 7800 Series chassis?
A: No, the DCS-7812R3-FM is specifically designed for the DCS-7812 chassis only. Other chassis in the 7800 Series, such as the 7804, 7808, and 7816, require their own corresponding fabric modules.

Q: What is the purpose of fabric modules in the 7800R3 Series chassis?
A: Fabric modules provide high-speed backplane connectivity in the modular chassis, enabling communication between line cards, supervisor modules, and other chassis components. They use a midplane-less design for direct connections.

Q: Can the DCS-7812 chassis operate with fewer than six fabric modules?
A: While graceful degradation is supported, all six fabric modules are required for full redundancy and optimal performance. Operating with fewer modules may reduce capacity and redundancy.

Q: What power supply requirements should I consider for the DCS-7812R3-FM?
A: Each fabric module consumes 681W typical and up to 917W maximum. With six modules required, plan for approximately 4.1kW to 5.5kW total fabric module power draw in your overall chassis power budget.