72-GPU MRC Fabric Rack — Arista 7060XE7 + Nvidia DGX H100 9 × DGX H100 (72 GPUs) · 8 planes · 16 × 7060XE7 (8 leaf + 8 spine) · 28.8 Tbps aggregate · 2-hop any-to-any 72-GPU MRC rack: 9 DGX H100 servers + 8 Arista 7060XE7 leaf + 8 spine Server Rack 9× DGX H100 · 72 GPUs total MRC Fabric — 8 independent planes Each column = 1 plane · Arista 7060XE7 leaf + spine P1 P2 P3 P4 P5 P6 P7 P8 Spine P1 Spine P2 Spine P3 Spine P4 Spine P5 Spine P6 Spine P7 Spine P8 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 ← no cross-plane links — planes are fully independent → Leaf P1 Leaf P2 Leaf P3 Leaf P4 Leaf P5 Leaf P6 Leaf P7 Leaf P8 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 7060XE7 DGX H100 #9 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 65–72 DGX H100 #1 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 1–8 DGX H100 #2 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 9–16 DGX H100 #3 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 17–24 DGX H100 #4 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 25–32 DGX H100 #5 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 33–40 DGX H100 #6 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 41–48 DGX H100 #7 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 49–56 DGX H100 #8 8× H100 · NVSwitch · 8× CX-7 @ 400G GPU 57–64 72 H100 GPUs 9× DGX H100 72 ConnectX-7 NICs 8 per server × 9 16 7060XE7 switches 8 leaf + 8 spine 28.8 Tbps total fabric 9 nodes × 3.2 Tbps 2 hops any-to-any leaf → spine → leaf 0 ECMP anywhere 32-bit EV/SRv6 · no dynamic routing Cable color = plane: P1 P2 P3 P4 P5 P6 P7 P8 · NIC n → leaf of plane n · each leaf uplinks to its spine · no cross-plane links