Arista DCS-7808-FM | 7800R3 Fabric Module for 7808 Chassis, 6 Slots

Q: How many fabric modules are required for the DCS-7808 chassis?
A: The DCS-7808 chassis has 6 fabric module slots, and all 6 fabric modules are required for the chassis to operate at full capacity and achieve non-blocking performance across all line cards.

Q: Is the DCS-7808-FM compatible with other Arista chassis models?
A: No, the DCS-7808-FM is specifically designed for the 7808 chassis and is not compatible with other chassis models such as the 7804, 7812, or 7816. Each chassis model requires its own specific fabric module variant.

Q: What is the function of a fabric module in a modular chassis?
A: Fabric modules provide high-speed interconnection between line cards in the chassis, creating a non-blocking data plane. They enable full-bandwidth communication between any two line cards simultaneously without contention, essential for modern data center workloads.

Q: Can the fabric modules be hot-swapped?
A: Yes, the fabric modules support graceful degradation, allowing the system to continue operating with reduced redundancy if a module needs replacement. However, for production deployments, all 6 modules should be installed for optimal performance and resilience.

Q: What maximum throughput does the 7808 chassis achieve with all fabric modules?
A: With all 6 fabric modules installed and populated line cards, the DCS-7808 chassis supports up to 230 Tbps total throughput and 48 Bpps forwarding rate, enabling up to 1,152 ports of 100GbE or 288 ports of 400GbE density.