The Mellanox SN3420 is a data centre leaf switch built for enterprise environments that need a cleaner path from 10GbE to faster 25GbE fabrics. It combines uplink headroom with stronger visibility, helping racks avoid congestion as workloads grow.
Guide price: Price range: £11,995.00 through £16,995.00 Ex. VAT
As virtualisation, storage traffic and east-west flows increase, rack networks need more uplink headroom and clearer visibility without adding avoidable oversubscription.
The Mellanox SN3420 is a top-of-rack switch for production data centres and private cloud environments that are standardising on 25GbE servers. Its 48×SFP28 + 12×QSFP28 port layout suits dense leaf deployments where server connectivity must stay simple while uplinks keep pace with demand.
With 100G uplinks and 2400 Gbps switching capacity, the platform gives racks the bandwidth required for storage, analytics and busy application clusters. Support for Onyx and Cumulus Linux also fits environments that need operational control and familiar automation paths.
For infrastructure teams, that translates into a 25GbE leaf that leaves more room for growth, better supports changing traffic patterns and helps maintain a steadier path to scale. It is a practical fit when you want to extend server estates without redesigning the fabric around them.
Our team can help you assess whether the Mellanox SN3420 is the right fit for your rack design, operating model and growth plans.
The Mellanox SN3420 is a networking switch for modern data center environments, delivering a high-density platform for scalable rack and leaf-spine deployments with flexible operating-system choice.
Flexible Mixed-Speed Port Design
The platform combines 48×SFP28 and 12×QSFP28 ports to support access and uplink connectivity within a single switch design.
Aggregate Switching Throughput
A 2400 Gbps switching capacity provides the bandwidth foundation needed for east-west traffic in dense data center fabrics.
Leaf-Spine Deployment Fit
Its port mix and throughput profile align with rack-scale switching roles in leaf-spine network architectures.
Platform Consolidation
The switch design supports multiple connectivity tiers in one system, reducing the need for separate access and aggregation devices.
Choice of Network Operating System
The switch supports Onyx and Cumulus Linux, allowing deployment to align with different operational models and automation approaches.
Standards-Based Management Model
OS flexibility enables integration into environments that prefer vendor-managed or Linux-based network operations.
Infrastructure Consistency
A single hardware platform can be managed under different software stacks to match existing data center practices.
If you are designing a compact high-density fabric or standardising switch operations across mixed environments, our team can help align the SN3420 with your network architecture.
The Nvidia Mellanox SN3420 is a 25GbE leaf switch for dense rack environments where host connections stay at 25GbE but uplink pressure, visibility and scaling headroom have become operational concerns.
In multi-rack data centres, the SN3420 fits leaf roles where virtualisation and storage traffic are pushing more data northbound. It gives teams extra uplink breathing room and clearer visibility than simpler first-generation 25GbE leaves.
Professional services teams running private-cloud platforms often keep a 25GbE server standard for cost control. The SN3420 supports that model while improving oversubscription management and telemetry as shared services and user estates expand.
Healthcare environments with imaging, analytics and lab systems need rack exits that cope with heavier data bursts. The SN3420 helps these workloads leave the rack more cleanly, reducing congestion without forcing a redesign of host connectivity.
Finance teams operating dense virtualisation and data-service clusters often reach the limits of older leaf designs before host bandwidth changes. The SN3420 adds uplink resilience and visibility so pressure can be spotted earlier and scaled more confidently.
Logistics sites increasingly combine automation, planning and analytics in densely packed 25GbE racks. The SN3420 offers stronger uplink scale for that traffic mix, helping operators avoid congestion as site platforms grow.
Planning an SN3420 deployment? Our team can help design and deploy the switch for 25GbE rack estates, validate uplink sizing and visibility, and support rollout across data centre, professional services, healthcare, finance and logistics environments.
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Below you’ll find alternative models, suitable software and services that pair with this solution – helping you to avoid compatibility issues, reduce support overhead and deploy with confidence.
Not all deployments fit standard configurations. If you’re weighing up options or want a second opinion on your setup, our team is here to help with honest, straightforward advice backed by decades of vendor knowledge.
Not sure which model is right for your environment? Our specialists can help you select the right platform for your infrastructure requirements.
