Largest single-chassis AI spine radix (7800R4-class modular, 460 Tbps): 576x800G or 1,152x400G — the ceiling below which the entire back-end fabric can be a single tier (one switch, or one per plane), eliminating the leaf tier's optics and cabling; two-tier on such spines is vendor-rated past 160k 800G endpoints
576 x 800Gobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Caveat | Vendor datasheet figures; the 160k+ two-tier number is a vendor scaling rating, not a documented deployment. |
| As of | 2026 |
| Source | Arista Networks |
| Review | checking…review by 2026-09-26 · fast cadence |
| Recorded changes | last 2026-08-24 · 2 revisions tracked |
| Claim id | single-tier-modular-spine-ceiling |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.