Product Overview # The Cisco Nexus 9400 Series centralized modular switches deliver high-density 400G switching with a modular 4RU chassis. Designed for next-generation applications such as AI/ML and cloud-scale workloads, the switches support:
Up to 25.6 Tbps switching capacity8 expansion slots for:64 × 400G
128 × 200G
176 × 10/25/50G ports
MACsec on all portsPrecision Time Protocol (PTP) Class C accuracyOperational modes: Cisco ACI or NX-OS Hardware Overview # Line Card Expansion Modules (LEMs) # Model Description MACsec N9K-X9400-8D 8 × 400G QSFP-DD All ports N9K-X9400-16W 16 × 200G QSFP56 All ports N9K-X9400-22L 22 × 10/25/50G SFP56 All ports
Features and Benefits # Architectural Flexibility # VXLAN EVPN, ACI, IP Fabric for Media, Layer-2/3 IPv4/IPv6 fabrics
Modular NX-OS with fault-isolating process model
Segment Routing (SR, SRv6), three-tier BGP architectures
Extensive protocol support (BGP, OSPF, EIGRP, PIM, MSDP)
Nexus Dashboard Data Broker for observability Extensive Programmability # Zero-touch provisioning via POAP
Support for Ansible, YANG, RESTCONF/NETCONF/gNMI
Model-driven telemetry
Application hosting via Application Framework Scalability, Flexibility, and Security # Flexible tables up to 2M entries
MACsec for encrypted physical-layer connections AI/ML Networking Support # Lossless Ethernet (RoCE, PFC, ECN)
Intelligent congestion management:
Enhanced Transmission Selection (ETS)
Data Center Bridging Exchange (DCBX)
Weighted Random Early Detection (WRED)
Approximate Fair Dropping (AFD) with ETRAP
Dynamic Packet Prioritization (DPP) High Availability # Virtual Port Channel (vPC) eliminates STP
64-way ECMP and ISSU support
N+2 PSU and N+1 fan redundancy
Software Maintenance Upgrades (SMUs) Nexus Dashboard Integration # Fabric Controller (NDFC), Orchestrator (NDO), Insights (NDI), and Data Broker (NDDB)
License tiers:
Essentials for NDFC
Advantage for NDO
Premier or Day-2 Ops for NDI Product Specifications # Chassis Specifications # Feature Value Model Cisco Nexus 9408 LEM Slots 8 Supervisor Slots 1 PSU 4 (2+2 redundancy) Fans 5 (4+1 redundancy) Height 4RU Dimensions (HxWxD) 6.97 × 17.30 × 23.62 in Weight 121.25 lb (55 kg) Airflow Port-side intake
Module Dimensions and Weight # Model Dimensions (in) Weight (lb) N9K-C9400-SUP-A 6.73 × 1.16 × 9.45 2.65 N9K-X9400-8D 6.73 × 1.88 × 9.45 3.75 N9K-X9400-16W 6.73 × 1.88 × 9.45 4.12 N9K-X9400-22L 6.73 × 1.88 × 9.45 3.63 N9K-C9400-SW-GX2A 4.88 × 17.27 × 15.39 35.49 N9K-C9400-FAN-PI 3.97 × 3.09 × 5.27 1.67
System Specifications # Component Value Processor Intel Broadwell-DE-NS D-1633N, 6-core @ 2.5GHz DRAM 32GB DDR4 SSD 128GB Console Ports 1 × RJ45, 1 × RS232 Management Ports 1 × 10/100/1000BASE-T, 1 × 1/10G SFP USB 1 × USB 3.0
Power Specifications # Module Typical Power (W) Max Power (W) N9K-C9400-SUP-A 50 75 N9K-X9400-8D 120 140 N9K-X9400-16W 100 145 N9K-X9400-22L 52 110 N9K-C9400-SW-GX2A 760 990
PSU Options # Type PID Output Input Voltage Efficiency AC NXA-PAC-2KW-PI 2000W 90–264V AC 80PLUS DC NXA-PDC-2KW-PI 2000W -40 to -72V DC 80PLUS HV NXA-PHV-2KW-PI 2000W 90–305V AC / 192–400V DC 80PLUS
Performance and Scalability # Specification Value IPv4 LPM Routes 1M IPv6 LPM Routes 500K IPv4/IPv6 Host Entries 1M each MAC Address Entries 500K Multicast Routes 256K IGMP Groups 32K ACL Entries 48K ingress / 24K egress VLANs 4096 (127 reserved) VRFs 16,000 ECMP Paths 64 Port Channels 512 Links per Port Channel 32 SPAN Sessions 32 (4 active) RPVST VLANs 4096 HSRP Groups 1000 MST Instances 64 Flow Table Size 128K/slice NAT Entries 2000 Output Queues 8
Supported Pluggable Optics # Refer to the official documentation for a list of supported transceiver modules and software version compatibility.
Software Licensing # The default system software includes Layer-2, security, and management capabilities. Additional licenses are required to enable:
Layer-3 unicast and multicast
Nexus Dashboard Data Broker
Tiered licensing: Essentials, Advantage, Premier Refer to the latest software and licensing guide for complete details.
Ordering Information # Part # Description N9K-C9408 9400 chassis, 8 LEM slots N9K-C9400-SUP-A Supervisor with PTP, SyncE N9K-X9400-8D 8 × 400G QSFP-DD LEM N9K-X9400-16W 16 × 100/200G QSFP56 LEM N9K-X9400-22L 22 × 10/25/50G SFP56 LEM N9K-C9400-SW-GX2A Switch card N9K-C9400-ACK Accessory kit N9K-C9400-RMK Rack-mount kit N9K-C9400-FAN-PI Port-side intake fan NXA-PAC-2KW-PI 2KW AC Power Supply NXA-PDC-2KW-PI 2KW DC Power Supply NXA-PHV-2KW-PI 2KW High-Voltage AC/DC Power Supply
Warranty Information # 1-year limited hardware warranty Includes hardware replacement with a 10-day turnaround from RMA receipt 
