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N3K-C3408-S
Cisco N3K-C3408-S Nexus 3408-S 8-Slot Chassis Switch
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N3K-C3408-S is an eight-slot modular data center switch chassis housed in a 4RU enclosure. The Nexus 3408-S provides Layer 2 switching in its license-free configuration, with advanced routing available through additional software entitlements. High-speed connections come from NXM-X16C or NXM-X4D line-card expansion modules rather than a fixed bank of populated chassis ports. The hardware configuration therefore determines the connection count and native interface speeds supplied with an order. This is an aggregation chassis for fiber-connected switching infrastructure, not an RJ-45 endpoint access switch. Buyers replacing an existing unit should match the installed module inventory and software entitlement separately rather than treating the chassis part number as a complete configuration.
N3K-C3408-S price for new stock is $26,315.10, a 44.7% saving from the Cisco list price of $47,622.00. N3K-C3408-S refurb price is $9,444.75. N3K-C3408-S is in stock and available for free next-day delivery. (terms applied)
Request bulk order quote for N3K-C3408-S for additional pricing. Browse the full Cisco Nexus 3400 Switches series or explore all Cisco products.
25600 Gbps switching capacity establishes the chassis bandwidth ceiling for the installed interface configuration. 7200 Mpps ingress and 10000 Mpps egress forwarding limits distinguish packet-processing capability by direction; the wire-rate qualification applies to packets greater than 200 bytes. N3K-C3408-S carries 32 GB of DRAM for control-plane operation. Within the Cisco Nexus 3000 family, management includes CLI access, SNMP, XML interfaces and Cisco DCNM integration. LACP, STP/RSTP/MSTP, UDLD and configurable CoPP belong to the default feature set, while SPAN and ERSPAN support traffic observation. BGP is not included in the license-free configuration. Essential licensing adds OSPFv2, EIGRP, BGP, IS-IS and VRF-Lite, so a routed deployment needs an entitlement that covers its intended protocols rather than confirmation that the hardware merely supports Layer 3 operation.
Order N3K-C3408-S in new sealed or certified refurbished condition, specifying the complete hardware configuration on the purchase order. Certified refurbished units are inspected and bench-tested for power-on and POST, rated-speed port links, clean boot, optics bay and module bay recognition, PSU status and fan status; firmware is verified and configurations are wiped to factory default. ORM warranties are up to 3-year extended for new and up to 1 year for certified refurbished, with 30-day returns on every condition, terms apply; Cisco's separate 1-year limited hardware warranty cannot extend beyond April 30, 2028. PO accepted, Net-30 for government and RMA with advance replacement support enterprise and volume orders across UK, EU, US and MEA regional stock and RMA operations.
| Key Specs | Key Spec Values |
|---|---|
Operating System | NX-OS |
Port Configuration | 8 expansion slots for 100G or 400G modules |
Cooling | 3 NXA-FAN-300CFM-PI fan modules |
Lifecycle Status | End of sale April 25, 2023 |
Replacement PID | N9K-C9408 |
In a cloud provider’s hyperscale data center, the N3K-C3408-S Nexus 3408-S switch with 32 ports of QSFP-DD delivers 12.8Tbps of spine capacity to support east-west traffic for thousands of VMs and containers. Benefit: Reduces oversubscription ratios by 50% and lowers latency to sub-600ns, enabling 3× higher application throughput.
For AI/ML training clusters housing 100+ GPU servers, the Nexus 3408-S switch aggregates 400Gbps links via 32 QSFP-DD ports to sustain parallel data flows at microsecond latency. Benefit: Accelerates model convergence by 20% and cuts inter-node data transfer times by 30%, speeding time-to-insights.
In telecom 5G core and edge environments, the N3K-C3408-S Nexus 3408-S switch aggregates high-density 400Gb connections from distributed units, offering in-service upgrades and carrier-grade resiliency. Benefit: Ensures sub-10ms deterministic latency at scale to 20 million subscribers and simplifies operational overhead.
When consolidating high-speed connections into a modular chassis, the configuration ceiling is 128 native 100G ports or 32 native 400G ports. Choose the required connection density before specifying the expansion-module population, then match the optical interfaces and cabling to the equipment at the other end of each link.
When commissioning a replacement before a maintenance window, the single RS-232 console connection provides a local setup path independent of production links. Prepare the console connection, management addressing and configuration-validation procedure in staging, then include the required management connections in the equipment checklist before releasing the purchase order.
Cisco support beyond April 2028
Cisco support for this discontinued chassis ends April 30, 2028. For a new deployment requiring a longer support horizon, evaluate the current replacement, N9K-C9408.
Port-side exhaust airflow
N3K-C3408-S supports port-side intake airflow. An installation requiring air to enter through the fan side and exhaust through the interface side needs different hardware.
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| N3K-C3408-S |  N3K-C3064TQ-32T |  N3K-C3132Q-40GX |  N3K-C3172TQ-10GT |  N3K-C31108TC-V | |
|---|---|---|---|---|---|
| Depth | 802.6 mm | 570 mm | 505 mm | 505 mm | 566 mm |
| Flash Memory | 128 GB | 2 GB | 4 GB | 2 GB | 64 GB |
| Form Factor | Chassis | Desktop | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U |
| Height | 177 mm | 44 mm | 44 mm | 44 mm | 44 mm |
| Manufacturer Part Number | N3K-C3408-S | N3K-C3064TQ-32T | N3K-C3132Q-40GX | N3K-C3172TQ-10GT | N3K-C31108TC-V |
| Switching Capacity | 25600 Gbps | 1280 Gbps | 2500 Gbps | 1400 Gbps | 2160 Gbps |
| Weight | 48.85 kg | 9.5 kg | 9.3 kg. | 10 kg. | 10 kg |
| Width | 439 mm | 439 mm | 439 mm | 439 mm | 439 mm |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 90 days, for dependable protection on every order. The exact term is confirmed on your quote, order confirmation and invoice.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Same-day dispatch from regional hubs, free next-day delivery*, fully tracked and insured.
Reviewed on the 24 December 2023
The QSFP-DD density is impressive. This switch supports our highest bandwidth requirements with ease.
Reviewed on the 17 November 2020
Built for next-generation networks. Performance, stability, and scalability have all been excellent.
Reviewed on the 18 June 2017
A powerful, well-designed switch that meets demanding enterprise networking needs without compromise.
Reviewed on the 20 October 2017
Handles extreme workloads reliably. It's a strong foundation for our high-speed data center fabric.
Reviewed on the 25 October 2022
We chose this switch for future growth. It delivers outstanding performance and efficiency.
N3K-C3408-S identifies the Cisco Nexus 3408-S eight-slot chassis, not an eight-port fixed switch or a software license. The 3408-S model uses expansion modules to determine its high-speed interfaces. N3K-C3408-S= is the spare ordering form; module population and software entitlements must be specified separately.
N3K-C3408-S supports local console CLI, remote CLI over SSHv2 or Telnet, in-band management, SNMP and Cisco DCNM. Programmable interfaces include NX-API and XML NETCONF, with Python scripting for automation. The chassis provides RJ-45 and SFP management connections, allowing management connectivity to be planned independently of its expansion-module interfaces.
N3K-C3408-S is discontinued, with end of sale on April 25, 2023 and the last date of Cisco support on April 30, 2028. Software maintenance ended April 24, 2024. Planned vulnerability support has an April 30, 2028 endpoint, subject to applicable service entitlement and coverage conditions.
ORM Systems offers N3K-C3408-S new sealed or certified refurbished. ORM warranty coverage is up to 3-year extended for new and up to 1 year for certified refurbished units, with 30-day returns on every condition; terms apply. Cisco's separate 1-year limited hardware warranty cannot extend beyond April 30, 2028.
N3K-C3408-S supports license-free Layer 2 operation and NX-OS Essentials subscriptions through N3K-ES-XM-3Y or N3K-ES-XM-5Y, with a three-year minimum. Legacy N3K-ES-XM perpetual and N3K-LAN2K9 feature licenses are discontinued. Subscription entitlement expires with its term, so confirm the required routing features, entitlement ownership and Smart Account assignment before ordering.
The Nexus 3408-S accepts NXM-X16C and NXM-X4D expansion modules in its eight slots. NXM-X16C supplies sixteen native 100G QSFP28 connections, while NXM-X4D supplies four native 400G QSFP-DD connections. Select the module population first, then match optics and breakout arrangements to supported interface modes and software requirements.
N3K-C3408-S accepts NXA-PAC-2KW-PI AC, NXA-PDC-2KW-PI DC or NXA-PHV-2KW-PI high-voltage power supplies. One supply is required for operation, while a second provides redundancy. Match the supply selection to the site feed and specify both supplies explicitly when redundant power is required on the purchase order.
The Nexus 3408-S includes VLAN trunking, LACP, UDLD, MSTP, RSTP and STP guard without an additional feature license. AAA, ACLs, storm control and CoPP are also included. These are default switching and protection functions; advanced routing protocols require an appropriate additional entitlement rather than the license-free feature set.
N3K-C3408-S provides 25600 Gbps switching capacity, with forwarding limits of 7200 Mpps at ingress and 10000 Mpps at egress. These are directional packet-processing figures, not one interchangeable rate. Assess the intended traffic profile against both limits and the installed interface configuration; wire-rate qualification applies above 200-byte packets.
N9K-C9408 supports 64 native 400G ports, while N3K-C3408-S supports 32 native 400G ports when fully populated. N3K-C3408-S serves replacement requirements within its existing connection ceiling; N9K-C9408 suits buyers planning a higher-density chassis configuration and migration to the current replacement rather than maintaining the discontinued model.
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