• Cisco N9K-X9736Q-FX Nexus 9000 switch with 36x40G QSFP+ ports
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Cisco

Cisco N9K-X9736Q-FX | Nexus 9500 36-Port 40G QSFP Line Card, MACsec, ACI Spine

N9K-X9736Q-FX

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Description

The Cisco N9K-X9736Q-FX is a 36-port 40 Gigabit Ethernet QSFP line card designed for the Nexus 9500 Series modular chassis. Built for data center spine and aggregation deployments, this line card delivers up to 1.44 Tbps of bandwidth and supports both NX-OS and ACI operating modes. With hardware-based MACsec encryption on all ports, it provides hop-by-hop security for enterprise and service provider networks requiring high-density 40G connectivity.

Features

36 x 40 Gigabit Ethernet QSFP ports with full port flexibility
- Hardware-based MACsec encryption (256-bit AES) on all ports for secure hop-by-hop communications
- Dual operating mode support: NX-OS aggregation and Cisco ACI Spine
- Port breakout support for 10G and 1G speeds for flexible deployment scenarios
- Fifth fabric module connector for enhanced redundancy and bandwidth
- Cloud Scale ASIC technology for high-performance packet forwarding
- VXLAN overlay network support for network virtualization
- Layer 2 and Layer 3 forwarding capabilities with advanced routing protocols
- Support for VRF-Lite, MPLS, and Segment Routing
- Comprehensive QoS and traffic management features
- Hot-swappable design with front-accessible ports for easy maintenance
- Advanced telemetry and analytics for real-time network visibility
- Compatible with Nexus 9504, 9508, and 9516 chassis platforms
- Energy-efficient design with intelligent power management

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

Port Configuration: 36 x 40 Gigabit Ethernet QSFP ports
- Port Modes: Supports 40G, 10G, and 1G speeds per port
- Bandwidth: Up to 1.44 Tbps throughput (36 ports × 40G)
- Architecture: 1.5:1 oversubscription with 4 fabric modules
- MACsec Encryption: Hardware-based 256-bit AES encryption on all ports
- Operating Modes: NX-OS aggregation mode and ACI Spine mode
- Fabric Module Support: Compatible with FM, FM-E, FM-E2 fabric modules
- Fifth Fabric Connector: Supports fifth fabric module (FM 5) for enhanced redundancy
- Chassis Compatibility: Nexus 9504, 9508, and 9516 chassis
- Form Factor: Modular line card, hot-swappable, front-accessible
- Weight: 12.13 lb (5.5 kg)
- Management: CLI, SNMP, NX-API, Cisco DCNM, ACI APIC

FAQs

Q: What is the difference between the N9K-X9736Q-FX and N9K-X9736C-FX?
A: The N9K-X9736Q-FX provides 36 ports of 40 Gigabit Ethernet QSFP, while the N9K-X9736C-FX provides 36 ports of 100 Gigabit Ethernet QSFP28. Both support MACsec encryption and ACI Spine/NX-OS modes, but the C-FX model delivers higher per-port bandwidth for modern data center requirements.

Q: Which Nexus 9500 chassis models support this line card?
A: The N9K-X9736Q-FX is compatible with all Nexus 9500 Series modular chassis including the 9504 (4-slot), 9508 (8-slot), and 9516 (16-slot) models. It requires compatible fabric modules (FM, FM-E, or FM-E2) and system controllers (N9K-SC-A) for operation.

Q: Does this line card support ACI fabric deployments?
A: Yes, the N9K-X9736Q-FX is designed for ACI Spine deployments and can operate in both ACI mode (managed by APIC) and traditional NX-OS mode. It provides the high-bandwidth, low-latency connectivity required for Cisco ACI leaf-spine architectures in data centers.

Q: What is MACsec and why is it important for this line card?
A: MACsec (Media Access Control Security) provides line-rate, hardware-based 256-bit AES encryption on all 36 ports, securing data at the hop-by-hop layer. This is critical for multi-tenant data centers, financial services, healthcare, and government deployments requiring encryption between network devices without performance impact.

Q: How many fabric modules are required for full bandwidth?
A: The N9K-X9736Q-FX requires a minimum of 4 fabric modules for operation and supports up to 5 fabric modules. With 4 fabric modules, the line card operates at 1.5:1 oversubscription. The fifth fabric module connector provides N+1 redundancy and improved bandwidth distribution across the chassis.

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