• Cisco N3K-C3408-S 8-slot 4RU chassis with 16-bay silver-black rack
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Cisco

Cisco N3K-C3408-S | Nexus 3400-S Modular Chassis Switch, 4RU, 8-Slot, 400G Capable

N3K-C3408-S

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Description

The Cisco Nexus 3408-S is a high-density 4RU modular chassis switch designed for data center spine and leaf deployments requiring 100G and 400G connectivity. The 8-slot chassis supports flexible line card expansion modules, offering up to 128 ports of 100G or 32 ports of 400G with industry-leading latency of 370ns and 25.6 Tbps switching capacity. Built on Cisco NX-OS, the 3408-S delivers programmable pipeline architecture with advanced analytics, Layer 2/3 features, and exceptional power efficiency for mission-critical data center environments.

Features

25.6 Tbps switching capacity with 12.8 Tbps ASIC per line card
- Industry-leading 370 nanosecond latency at 400G
- Modular 8-slot chassis supporting 100G and 400G line card expansion modules
- Flexible port breakout: 2x200G, 4x100G, 8x50G, and lower speeds
- Programmable pipeline architecture with LPM-optimized and Layer 3 host-optimized profiles
- 512-way Equal-Cost Multipath (ECMP) routing for Layer 3 fat-tree designs
- Virtual Port Channel (vPC) technology for Layer 2 multipath and STP elimination
- Deep network analytics with per-flow monitoring, queue forensics, and drop-packet analysis
- VXLAN overlay support with BGP EVPN control plane
- Layer 2 and Layer 3 switching with advanced routing protocols (BGP, OSPF, IS-IS)
- Cisco NX-OS operating system with modular, resilient architecture
- Hot-swappable dual-redundant power supplies and 2+1 fan redundancy
- Industry-leading power efficiency and performance-per-watt
- Support for AC, DC, and HVAC/HVDC power inputs
- Port-side intake airflow for optimized data center cooling
- Comprehensive management via CLI, NX-API, SNMP, NetFlow, and sFlow

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

Form Factor: 4RU modular chassis, 8-slot line card expansion
- Port Configuration: Up to 128x 100G QSFP28 or 32x 400G QSFP-DD ports (depending on line card modules)
- Switching Capacity: 25.6 Tbps
- Latency: 370 nanoseconds at 400G
- Line Card Modules: Supports 100G LEM (16-port QSFP28) and 400G LEM (4-port QSFP-DD)
- Breakout Support: 2x200G, 4x100G, 8x50G, and 10/25/40/50/100G speeds
- Management Ports: 2x 100/1000 Mbps SFP, 1x RS-232 console, 1x RJ45 management, 1x SFP management, 1x USB
- Power Supply: Dual-redundant AC/DC/HVAC power supplies (hot-swappable)
- Cooling: Redundant 2+1 fan modules, port-side intake airflow
- Memory and Flash: 128 GB flash storage
- Operating System: Cisco NX-OS
- Certifications: FCC, CE, RoHS compliant

FAQs

Q: What line card modules are compatible with the Nexus 3408-S chassis?
A: The chassis supports two types of line card expansion modules: the NXM-X16C with 16 ports of 100G QSFP28, and the NXM-X4D with 4 ports of 400G QSFP-DD. Line cards can be mixed within the chassis to provide flexible 100G/400G deployments up to the maximum capacity of 128x 100G or 32x 400G ports.

Q: Does the Nexus 3408-S require software licensing?
A: Yes, the Nexus 3408-S requires software licensing for advanced features. Cisco offers different license tiers for NX-OS, including Essentials and Advantage licenses that unlock Layer 3 routing, security, and analytics capabilities. Check Cisco licensing documentation for specific feature requirements.

Q: What makes the 3408-S suitable for data center spine deployments?
A: The 3408-S provides exceptional port density with 25.6 Tbps switching capacity and ultra-low 370ns latency, making it ideal for spine and core applications. Its support for 400G uplinks, 512-way ECMP routing, and Virtual Port Channel technology enables large-scale leaf-spine fabrics with simplified management and maximum bandwidth utilization.

Q: Is the Nexus 3408-S compatible with existing Nexus 3000 deployments?
A: Yes, the 3408-S runs Cisco NX-OS and integrates seamlessly with existing Nexus 3000 and 9000 series deployments. It supports standard data center protocols including VXLAN, BGP EVPN, and vPC, ensuring compatibility with multi-vendor leaf-spine architectures and Cisco ACI environments.

Q: What optical transceivers are supported?
A: The 3408-S supports the full range of QSFP28 and QSFP-DD optical modules including Active Optical Cables (AOC), Direct Attach Cables (DAC), and fiber transceivers for 10G, 25G, 40G, 50G, 100G, 200G, and 400G connectivity. Consult the Cisco Transceiver Module Group Compatibility Matrix for specific module requirements and minimum NX-OS release versions.

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