• Cisco N9K-X9736C-FX 36-port 100G QSFP28 switch
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Cisco

Cisco N9K-X9736C-FX | 36x100G QSFP28 | 40/100G, 4x25G breakout | PoE: N/A | Uplinks: N/A | license: NX-OS/ACI mode | optics: 100G QSFP28 (100GBASE-SR4/LR4), 850/1310 nm, reach per optic, MPO/LC | MACsec: Yes

N9K-X9736C-FX

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Description

Security-enhanced 36-port 100G line card for 9500-series chassis with MACsec on the 100G interfaces. Optimized for secure aggregation and ACI spine roles, it supports 100G/40G and 4x25G breakout for granular capacity planning. Delivers line-rate throughput and low latency across NX-OS and ACI environments. Compatible with a broad range of QSFP28 optics and DAC/AOC cables.

Features

- Integrated MACsec for encrypted 100G fabric links
- Dense 36x100G for large-scale leaf/spine designs
- Flexible operation in NX-OS or ACI modes
- Backward compatibility with 40G and 25G fan-out
- Line-rate performance with comprehensive QSFP28 optic support

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

Technical Specifications

- Port density: 36 x QSFP28
- Supported speeds: 100G and 40G; 4x25G breakout (QSFP28 to 4xSFP28)
- MACsec: Supported on 100G ports (FX variant)
- Operating modes: NX-OS aggregation/spine and ACI spine
- Per-slot throughput: up to 3.6 Tbps line-rate forwarding
- Optics & cables: QSFP28 SR4/LR4/CWDM4/PSM4; QSFP28 DAC/AOC; QSFP+ for 40G
- Connectors (by optic): MPO-12 for SR4/PSM4; LC duplex for LR4/CWDM4
- Chassis compatibility: Nexus 9500 Series (e.g., 9504/9508/9516), with compatible supervisors and fabric modules
- Software compatibility: Supported NX-OS and ACI releases (see platform compatibility matrix)
- Security: Link-layer encryption with MACsec (802.1AE) where supported
- Breakout support subject to software and transceiver capabilities

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