12.8 Tbps · 900ns Latency · 32× 400G in 1RU — The Enterprise & Cloud Data Centre Leaf/Spine Standard
The Arista 7050X4 Series delivers 400G switching performance in compact 1RU and 2RU form factors — up to 32× 400G ports, 12.8 Tbps throughput, sub-microsecond latency, and full VXLAN/EVPN support. Running Arista EOS with CloudVision integration, Dynamic Load Balancing, and 128-way ECMP, the 7050X4 is the go-to leaf and spine platform for enterprise data centres, cloud providers, and service providers deploying modern spine-leaf architectures.
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The 7050X4 Series achieves from 900ns latency through hardware-optimised cut-through switching on the Broadcom Tomahawk 4 ASIC. Wire-speed L2 and L3 forwarding across all port combinations — 10G, 25G, 40G, 50G, 100G, 200G, and 400G — ensures uniform performance regardless of traffic pattern or mix.
Native VXLAN with BGP EVPN provides both L2 and L3 overlay services for multi-tenant data centre architectures without additional gateway appliances. Single Pass VXLAN Routing enables VXLAN routing within the switch itself — eliminating the need for dedicated L2/L3 gateway nodes and reducing east-west traffic tromboning.
Arista's Dynamic Load Balancing (DLB) continuously monitors link congestion and redistributes flows across ECMP paths in real time — unlike static hash-based load balancing that can cause hot spots on specific links. Combined with 128-way ECMP, DLB delivers consistently high utilisation across all spine uplinks without manual tuning.
Every Arista switch runs a single binary EOS image — the same OS across fixed and modular platforms, the same CLI, the same API behaviour. EOS's multi-process architecture with Stateful Fault Containment (SFC) and Stateful Fault Repair (SFR) isolates failures to individual processes without impacting forwarding. Full Linux shell access, Python and Go scripting, OpenConfig, and eAPI are available on every switch.
Arista CloudVision provides centralised provisioning, change management, and real-time streaming telemetry for every EOS switch in the network. Zero Touch Provisioning (ZTP) brings new 7050X4 switches online automatically from configuration templates. CloudVision's network-wide state database enables instant root cause analysis — correlating streaming telemetry from hundreds of switches without manual log correlation.
Selected 7050X4 models (including the 7050DX4M-32S) support MACsec (802.1AE) hardware encryption on up to 16 ports — providing line-rate Layer 2 encryption for sensitive traffic crossing data centre interconnects. MACsec operates transparently to upper-layer protocols and adds no measurable latency overhead at hardware implementation.
The Arista 7050X4 Series is a family of high-performance fixed-configuration data centre switches built on the Broadcom Tomahawk 4 ASIC, delivering up to 12.8 Tbps of switching throughput in a 1RU form factor. The series supports flexible port speeds from 10G through to 400G, with models ranging from 32× 400G leaf/spine configurations to hybrid 48× 25G + 4× 400G top-of-rack designs.
All 7050X4 models run Arista EOS — the industry's most operationally consistent network OS. A single binary image runs identically across all Arista platforms, ensuring that skills and automation developed on a small test environment translate directly to production. The EOS multi-process architecture ensures hardware forwarding continues uninterrupted during software upgrades, process restarts, and live patches.
VXLAN with BGP EVPN is supported natively, enabling both L2 and L3 overlay services for multi-tenant data centre architectures. Single Pass VXLAN Routing combines ingress and egress VXLAN operations in a single hardware pass — enabling VXLAN routing without dedicated gateway appliances and eliminating the N+1 gateway bottleneck common in first-generation VXLAN deployments.
CloudVision integration provides streaming telemetry from every switch, enabling Arista's network-wide observability approach where individual switch state is always visible alongside the global network view. This enables rapid troubleshooting without SSH to individual switches — microburst events, congestion drops, and routing changes are all surfaced automatically through CloudVision's event correlation engine.
The 7050X4 is the dominant Arista leaf and spine switch for enterprise data centres deploying BGP EVPN VXLAN spine-leaf architectures. 32× 400G spine connectivity enables non-blocking oversubscription-free fabrics at enterprise scale; 128× 10/25G leaf connectivity supports high-density compute and storage servers with upgrade headroom to 100G.
AI training clusters require non-blocking fabric with consistent latency across all GPU-to-GPU paths. The 7050X4's hardware Dynamic Load Balancing and 128MB buffer handle the bursty all-to-all communication patterns of distributed training (AllReduce, AllGather) better than statically-hashed ECMP — avoiding link hot spots that create GPU idle time.
Arista's heritage is hyperscale cloud — the 7050X4 is deployed at cloud providers including major public cloud operators. Its energy efficiency (<10W per 400G port), high port density, and automation-first EOS architecture make it the reference implementation for cloud-scale spine-leaf networks where operational repeatability and zero-touch provisioning are essential.
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