CISCO 

N3K-C3408-S= Cisco Nexus 3408-S - Switch - L3 - managed - 32 x 400 Gigabit QSFP-DD - rack-mountable

Mfg Part Number:  N3K-C3408-S=  
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Last Updated: Oct 19, 2025
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Cisco Nexus 3400-S overview

The Cisco Nexus® 3400-S is the first 400G capable switch in the Nexus 3000 portfolio with 50 Gbps PAM4 Serial-Deserializers (SerDes), designed for data centers with industry-leading performance-per-watt power efficiency at low latency, offering leading analytics.

Main benefits of the Cisco Nexus 3400-S switches:

  • With the 12.8-Tbps ASIC, the Cisco Nexus 3408-S series provides 128 ports of 100G or 32 ports of 400G, allowing customers to grow at scale with fewer numbers of switches in their fabric, simplifying management and reducing cost and number of hops.
  • At 400G, the Cisco Nexus 3400-S offers the lowest latency in the industry at high power efficiency.
  • The Cisco Nexus 3400-S offers a programmable pipeline translated to flexible profiles, whether Longest-Prefix-Matching (LPM)-optimized or layer 3 host-optimized. Customers can choose the profile to match their deployment needs.
  • Cisco Nexus 3400-S switches enable deep network analytics, offering per flow monitoring, queue forensics, and drop-packet forensics to help monitor customer networks.


The Cisco Nexus 3408-S (Figure 1) is a 4-Rack-Unit (RU), 8-slot chassis with the flexibility of 100G or 400G Line-Card Expansion Modules (LEMs) offering 128 ports of 100G or 32 ports of 400G. The Cisco Nexus 3408-S is the industry's highest port radix in a compact and energy-efficient form factor. The Cisco Nexus 3408-S supports HVAC/DC power inputs with forward airflow direction.

Main Specification
General Information
Manufacturer Cisco Systems, Inc
Manufacturer Part Number N3KC3408S
Manufacturer Website Address http://www.cisco.com
Brand Name Cisco
Product Line Nexus
Product Name Nexus 3400-S Ethernet Switch
Product Type Layer 3 Switch
Interfaces/Ports
Modular Yes
Port/Expansion Slot Details 32 x 400Gbit LAN QSFP-DD Expansion Slot
Port/Expansion Slot Details 1 x Management SFP Expansion Slot
Port/Expansion Slot Details 1 x Management RJ-45 Network Port
Port/Expansion Slot Details 2 x 1000Base-X SFP Expansion Slot
Port/Expansion Slot Details 1 x USB Port
Port/Expansion Slot Details 1 x (RS-232) Serial Port
Media & Performance
Media Type Supported Optical Fiber
Ethernet Technology 400 Gigabit Ethernet
Maximum Data Transfer Rate 50 GB/s
I/O Expansions
Total Number of Expansion Slots 34
Expansion Slot Type QSFP-DD
Network & Communication
Layer Supported 3
Networking Standards IEEE 802.1p
Networking Standards IEEE 802.3ba
Networking Standards IEEE 802.3ad
Networking Standards IEEE 802.3ae
Networking Standards IEEE 802.1AX
Networking Standards IEEE 802.3z
Networking Standards IEEE 802.1ab
Networking Standards IEEE 802.1D
Networking Standards IEEE 802.1w
Networking Standards IEEE 802.1s
Networking Standards IEEE 802.1Q
Management & Protocols
Manageable Yes
Power Description
Input Voltage 230 V AC
Input Voltage 120 V AC
Frequency 60 Hz
Frequency 50 Hz
Power Source Power Supply
Number of Power Supplies Supported 2
Power Consumption 500 W
Physical Characteristics
Color Family Gray
Product Color Gray
Compatible Rack Unit 4U
Form Factor Rack-mountable
Height 7"
Width 17.3"
Depth 13.6"
Weight (Approximate) 68 lb
Miscellaneous
Application/Usage Data Center
Warranty
Limited Warranty 1 Year
WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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