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Cisco Nexus N9K-X9736C-FX: Next-Generation 400G/800G Line Card
Jun 19 , 2025 153

Cisco Nexus N9K-X9736C-FX: Next-Generation 400G/800G Line Card


N9K-X9736C-FX


Product Overview
The Cisco Nexus N9K-X9736C-FX is a high-density 36-port line card for the Nexus 9000 Series, delivering cutting-edge 400G connectivity with future-ready 800G capabilities. Designed for hyperscale data centers and AI/ML workloads, this advanced module provides exceptional performance, scalability, and intelligence for modern network infrastructures.

Key Specifications:

  • Port Configuration: 36 x 400G QSFP-DD (800G-ready with optics upgrade)

  • Throughput: 14.4Tbps switching capacity

  • Latency: <700ns port-to-port

  • Processor: Cisco Silicon One G3 ASIC

  • Memory: 64GB DDR5 for packet buffering

  • Security: MACsec 256-bit encryption (quantum-safe ready)

  • Cooling: Variable-speed fans with airflow control

Performance Features:
✔ 400G native with 800G capability via software
✔ Breakout support to 4x100G or 2x200G per port
✔ AI-powered traffic engineering
✔ Precision timing (PTP) for financial applications
✔ Energy-efficient design (3.5W per 100G)

Next-Generation Evolution: Nexus N9K-X9672C-GX (Projected 2027)

Major Enhancements:

  • Port Density: 72 x 800G OSFP ports

  • Throughput: 28.8Tbps (2x capacity)

  • Latency: <350ns (50% reduction)

  • New Capabilities:

    • Co-packaged optics support

    • Autonomous network operations

    • In-band network telemetry

    • Photonic integration

  • Power Efficiency: 40% improvement per bit

Why Upgrade?

  • Support for 1.6T emerging standards

  • AI-native architecture with on-chip ML

  • Photonic switching capabilities

  • Zero-touch provisioning

  • Sustainable networking with reduced carbon footprint

Conclusion:
The N9K-X9736C-FX establishes a new benchmark for 400G/800G networking, while the N9K-X9672C-GX represents the future of data center switching with photonic integration and AI-native operation. This evolution maintains backward compatibility while delivering revolutionary improvements in density, performance, and automation for next-generation applications.


Tags: N9K-X9736C-FX linecard cisco

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