• Cisco N9K-X9400-8D 8x 400G line card in silver Dell server rack
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Cisco

Cisco N9K-X9400-8D | Nexus 9400 8-Port 400G QSFP-DD Line Card, 3.2 Tbps

N9K-X9400-8D

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Description

The Cisco N9K-X9400-8D is an 8-port 400G QSFP-DD line expansion module designed for the Nexus 9400 Series modular switches. Built for high-density data center spine-leaf fabrics, it delivers 3.2 Tbps throughput with flexible breakout support for 100G, 200G, and 400G Ethernet, enabling scalable cloud and machine learning workloads. Full MACsec encryption on all ports ensures end-to-end security for mission-critical traffic.

Features

Cisco Cloud Scale ASIC with advanced packet processing
- Wire-rate Layer 2 and Layer 3 switching at all port speeds
- Full MACsec encryption on all ports (IEEE 802.1AE)
- VXLAN and EVPN support for overlay networks
- Segment routing for traffic engineering
- Precision Time Protocol (PTP) with Class C timing accuracy
- Synchronous Ethernet (SyncE) support
- Comprehensive Layer 2 protocols: VLANs, STP, vPC
- Advanced Layer 3 routing: OSPF, BGP, IS-IS, EIGRP
- Multicast routing: PIM, IGMP, MLD
- Quality of Service (QoS) with flexible queuing and scheduling
- Advanced telemetry and streaming analytics
- Python and REST API programmability
- SDN and automation framework integration
- Hot-swappable for zero-downtime maintenance
- Redundant power and cooling architecture support
- Front-to-back or back-to-front airflow compatible
- LED indicators for port status and diagnostics

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

8x 400G QSFP-DD ports
- Total throughput: 3.2 Tbps per line card
- Breakout support: 400G, 200G, 100G Ethernet
- MACsec encryption on all ports (64 ports full-chassis)
- Wire-rate Layer 2 and Layer 3 forwarding
- Cisco Cloud Scale ASIC technology
- Hot-swappable field-replaceable unit
- Compatible with Cisco Nexus 9400 Series chassis (N9K-C9404, N9K-C9408, N9K-C9412)
- Advanced telemetry and traffic visibility
- Requires N9K-C9400-SW-GX2A switch card for operation
- Operating modes: Cisco ACI or NX-OS
- High-power optics support: up to 32 ports of 20W optics per full chassis

FAQs

Q: What Nexus 9400 chassis models are compatible with the N9K-X9400-8D?
A: The N9K-X9400-8D line card is compatible with all Cisco Nexus 9400 Series chassis, including the N9K-C9404 (4-slot), N9K-C9408 (8-slot), and N9K-C9412 (12-slot) models. It requires the N9K-C9400-SW-GX2A switch card and a compatible supervisor module to operate.

Q: Does this line card support port breakout to lower speeds?
A: Yes, the N9K-X9400-8D supports flexible port breakout configurations. Each 400G QSFP-DD port can be broken out to 2x 200G, 4x 100G, or 8x 50G connections using appropriate breakout cables and transceivers, enabling cost-effective migration and mixed-speed deployments.

Q: Is MACsec encryption supported on all ports?
A: Yes, the N9K-X9400-8D provides full MACsec (IEEE 802.1AE) encryption capability on all 8 ports at line rate, supporting up to 64 ports of MACsec in a fully populated 8-slot chassis. This enables secure Layer 2 encryption for sensitive data center traffic without performance impact.

Q: What is the throughput capacity of this line card?
A: The N9K-X9400-8D delivers 3.2 Tbps of total throughput (8 ports x 400 Gbps), with wire-rate Layer 2 and Layer 3 forwarding performance. This high bandwidth capacity makes it ideal for spine-leaf fabrics, high-performance computing, and cloud-scale data center applications.

Q: Can this line card operate in both ACI and NX-OS modes?
A: Yes, the N9K-X9400-8D supports both Cisco Application Centric Infrastructure (ACI) and standalone NX-OS operating modes. The mode is determined by the supervisor module and software configuration, allowing deployment in either policy-driven ACI fabrics or traditional NX-OS environments.

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