Cisco Nexus 9300-FX2 Series 36 × 100G Data Centre Spine Switch (N9K-C9336C-FX2)

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The Cisco Nexus N9K-C9336C-FX2 is one of the most widely deployed data centre spine switches in enterprise and service provider networks — a 1U fixed-configuration switch delivering 36 × 100G QSFP28 ports with 7.2 Tbps of non-blocking switching capacity. In a standard spine-leaf data centre architecture, a pair of N9K-C9336C-FX2 spine switches connects to every leaf switch in the fabric — providing equal-cost multi-path (ECMP) routing for maximum bandwidth and resilience.

Each of the 36 × 100G QSFP28 ports supports cable breakout to 4 × 25G, meaning a single spine switch can support up to 144 × 25G leaf uplinks — providing significant port density for growing fabrics without requiring modular chassis spine switches. This makes the N9K-C9336C-FX2 cost-effective for medium-to-large data centres where a pair of fixed-configuration spine switches is preferred over modular Nexus 9500 chassis.

In Cisco ACI fabric mode, the N9K-C9336C-FX2 registers with the APIC cluster as a spine node — automatically establishing Inter-Site and Multi-Pod fabric paths, propagating endpoint group policies from leaf to leaf, and providing anycast IP routing across the fabric. In NX-OS standalone mode with VXLAN BGP EVPN, the spine acts as a route reflector for the BGP EVPN control plane — distributing MAC/IP routes from all leaf nodes to all other leaf nodes without requiring a full mesh of direct BGP peerings.

MACsec hardware encryption on all 36 × 100G ports ensures that all spine-to-leaf inter-switch links are encrypted at Layer 2, protecting data centre traffic from eavesdropping within the fabric. Rich streaming telemetry provides real-time visibility into fabric health, traffic flows, and latency — essential for capacity planning and proactive anomaly detection in mission-critical data centres.