• Cisco N9K-X9736C-FX3 36-port 100G QSFP28 silver switch with MACsec
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Cisco

Cisco N9K-X9736C-FX3 | Nexus 9500 36-Port 100G QSFP28 Line Card, MACsec, ACI Spine

N9K-X9736C-FX3

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Description

The Cisco N9K-X9736C-FX3 is a high-performance 36-port 100 Gigabit Ethernet QSFP28 line card for Nexus 9500 modular switches, designed for cloud-scale data center aggregation and spine deployments. Powered by four Cisco LS1800FX3 ASICs, it delivers up to 3.6 Tbps per slot with five fabric modules and includes hardware-based MACsec encryption on all ports. Ideal for large-scale NX-OS or ACI spine architectures requiring advanced security and ultra-low latency.

Features

Cloud-scale architecture with four Cisco LS1800FX3 ASICs for forwarding and encryption
- Line-rate 256-bit AES MACsec encryption on all ports for secure Layer 2 communications
- Fifth fabric module connector for full 3.6 Tbps bandwidth when paired with FX/FX3 line cards
- Flexible port breakout to 50G, 40G, 25G, 10G, and 1G speeds
- VXLAN and EVPN support for overlay networking and multi-tenancy
- Segment Routing and real-time telemetry for advanced traffic engineering
- Hot-swappable design for zero-downtime maintenance and upgrades
- Layer 2 and Layer 3 switching capabilities with large routing tables
- ACI spine and NX-OS aggregation deployment modes
- 160 MB packet buffer for traffic burst absorption and low latency
- Supports VPC, FabricPath, and layer 2/3 protocols (BGP, OSPF, ISIS)

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

FAQs

Technical Specifications

36 x 100 Gigabit Ethernet QSFP28 ports
- Port breakout support: 2x50G, 1x40G, 4x25G, 4x10G, 1x1/10G per port
- Switching bandwidth: Up to 3.6 Tbps per slot (with 5 fabric modules), 3.2 Tbps (with 4 fabric modules)
- ASIC: Four Cisco LS1800FX3 cloud-scale ASICs
- MACsec encryption: 256-bit AES, line-rate, hardware-based on all ports
- Packet buffer: 160 MB
- Supported fabric modules: FM-E, FM-E2, FM-G, FM-GX
- Compatible chassis: Nexus 9504, 9508, 9516
- Operating modes: NX-OS aggregation and ACI spine
- Weight: 15.0 lb (6.8 kg)
- Hot-swappable, front-accessible installation

FAQs

Q: What fabric modules are compatible with the N9K-X9736C-FX3?
A: The N9K-X9736C-FX3 supports Nexus 9500 fabric modules including FM-E, FM-E2, FM-G, and FM-GX. For full 3.6 Tbps bandwidth per slot, install five fabric modules with all line cards being X9736C-FX3 or X9736C-FX models.

Q: Does this line card support MACsec encryption?
A: Yes, the N9K-X9736C-FX3 provides hardware-based 256-bit AES MACsec encryption on all 36 ports at line rate. MACsec is supported on breakout ports and operates in switch-to-switch mode for secure hop-by-hop encryption.

Q: Can I mix the N9K-X9736C-FX3 with other line cards in the same chassis?
A: Yes, the N9K-X9736C-FX3 can be mixed with other EX, FX, and GX line cards in the same Nexus 9500 chassis. However, mixed configurations are limited to four fabric modules maximum, reducing bandwidth to 3.2 Tbps per FX3 slot.

Q: What operating modes does the N9K-X9736C-FX3 support?
A: The line card operates in both NX-OS mode for aggregation deployments and ACI spine mode for Application Centric Infrastructure fabrics. It supports advanced features including VXLAN, EVPN, Segment Routing, and real-time telemetry.

Q: What port breakout options are available?
A: Each 100G QSFP28 port supports flexible breakout configurations: 2x50G, 1x40G, 4x25G, 4x10G, or 1x1/10G. This provides deployment flexibility for mixed-speed environments and future-proofs infrastructure investments.

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