Cisco 8800 36x400GE QSFP56-DD Line Card | 400GE, Enterprise — SD-AR3K-88LC036H

Add dense 400GE capacity to a Cisco 8800 platform with a line card engineered for high-bandwidth network fabrics. With 36 QSFP56-DD ports, this module is built for environments that need to move large volumes of traffic efficiently across core, spine, and aggregation layers. The value is in the density. Instead of consuming more chassis space or adding more lower-speed modules, this line card concentrates high-speed connectivity into a single slot, helping preserve rack footprint and simplify scaling decisions. That matters when you are extending fabric capacity for AI, storage, virtualization, or east-west traffic patterns that punish slower uplinks. For infrastructure teams, the appeal is straightforward: more throughput per slot, fewer physical constraints, and a cleaner path to higher-speed interconnects. It is a premium fit for organizations standardizing on Cisco switching architecture and planning for sustained growth rather than short-term patchwork upgrades. Ideal For Core network expansion in large enterprise data centers High-density spine or aggregation uplinks in leaf-spine fabrics Bandwidth scaling for virtualization and storage traffic Capacity growth for Cisco-based campus or backbone architectures Why This Product 1 36 x 400GE ports deliver far higher density than lower-speed expansion cards 2 QSFP56-DD interface support fits modern high-bandwidth fabric designs 3 Cisco 8800 compatibility keeps the upgrade aligned to existing chassis architecture 4 Single-slot expansion helps preserve rack and chassis efficiency