NVIDIA Spectrum SN3420
Brand: NVIDIA | Category: Network Switches
SKU: SN3420-4S | Part #: SN3420-4S | MPN: SN3420-4S
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About the NVIDIA Spectrum SN3420
The NVIDIA Spectrum SN3420 (part number SN3420-4S) delivers cut-through switching architecture with sub-microsecond latency, enabling wire-speed performance across 48 x 25GbE ports and 12 x 100GbE uplinks. Built on the NVIDIA Spectrum-2 ASIC, this 1U rack-mount switch achieves 1.2 Tbps switching capacity and 900 Mpps forwarding throughput—essential for high-performance computing clusters, AI infrastructure teams, and data center operators demanding deterministic, low-latency packet processing.
Network engineers and infrastructure architects rely on the SN3420-4S for its advanced Layer 2 and Layer 3 protocol support, including VLAN, MLAG, BGP, OSPF, and VXLAN, alongside full RoCEv2 RDMA capabilities with ECN and PFC for lossless Ethernet. The 100GbE QSFP28 ports support 4x25GbE breakout, delivering flexibility for mixed-speed deployments. Management is simplified via redundant hot-swappable power supplies, dual airflow options (PSE/PSI), out-of-band RJ-45 access, and native NVIDIA Cumulus Linux or Onyx OS integration. With 128K MAC address capacity and 80K IPv4 routing entries, this switch scales efficiently across enterprise and hyperscale environments operating between 0°C and 40°C. Contact Omnixon Global for an RFQ today.
Key Specifications
- ASIC & Architecture: NVIDIA Spectrum-2 with cut-through forwarding
- Switching Capacity: 1.2 Tbps; Forwarding Rate: 900 Mpps
- Port Configuration: 48 x 25GbE SFP28 + 12 x 100GbE QSFP28 with 4x25GbE breakout support
- Protocol Support: BGP, OSPF, VXLAN, BGP-EVPN, RoCEv2 with DCQCN
- Management: Redundant hot-swappable PSUs, out-of-band RJ-45, USB, NVIDIA Cumulus Linux or Onyx OS
- Routing Capacity: 80K IPv4 + 48K IPv6 routes; 128K MAC table
Technical Specifications
| Brand | NVIDIA |
| Category | Network Switches |
| SKU | SN3420-4S |
| Part Number | SN3420-4S |
| Condition | New |
| Interface | 25GbE |
| Speed | 200/400GbE |
| Manufacturer Part Number | SN3420-4S |
| ASIC | NVIDIA Spectrum-2 |
| Form Factor | 1U rack-mount |
| Total Switching Capacity | 1.2 Tbps |
| Forwarding Rate | 900 Mpps |
| 25GbE SFP28 Ports | 48 |
| 100GbE QSFP28 Uplink Ports | 12 |
| Port Breakout Support | 100GbE QSFP28 ports support 4x25GbE breakout |
| Supported Network OS | NVIDIA Cumulus Linux, NVIDIA Onyx |
| Layer 2 Protocols | VLAN, MSTP, MLAG, LACP |
| Layer 3 Protocols | BGP, OSPF, VXLAN, BGP-EVPN |
| RDMA Support | RoCEv2 with ECN, PFC, DCQCN |
| Management Interfaces | 1 x RJ-45 out-of-band management, 1 x USB |
| Power Supplies | Redundant hot-swappable PSUs |
| Airflow Options | Port-side exhaust (PSE) / Port-side intake (PSI) |
| MAC Address Table Size | 128K entries |
| IPv4 Route Table Size | 80K entries |
| IPv6 Route Table Size | 48K entries |
| Operating Temperature | 0°C to 40°C |
| Rack Units | 1U |
Frequently Asked Questions about NVIDIA Spectrum SN3420
What does the NVIDIA Spectrum SN3420 do?
The NVIDIA Spectrum SN3420 is enterprise networking hardware for data-center, campus, and branch deployments. Common roles include core/distribution switching, server uplinks, top-of-rack fabric, and edge connectivity in mixed Cisco/Juniper/Arista environments.
What are the headline specs of the NVIDIA Spectrum SN3420?
Key specifications for the NVIDIA Spectrum SN3420: new condition; network type Ethernet Switch; network port config 32x 200GbE + 2x 400GbE; network speed 200/400GbE; network switching capacity 6.4 Tbps; network forwarding rate 4.76 Bpps; network power consumption 280W. Manufacturer part number SN3420-4S. For the full datasheet with electrical, environmental, and compliance details, contact our pre-sales engineering team.
Is the NVIDIA Spectrum SN3420 compatible with my infrastructure?
The NVIDIA Spectrum SN3420 interoperates with standard switching protocols (LACP, MLAG/VPC, 802.1Q, OSPF/BGP). For specific cross-vendor scenarios — Cisco-to-Arista MLAG peering, fabric integration with Cumulus/SONiC, or migration from legacy Catalyst — our network engineers map a compatibility plan as part of the RFQ.