• White arista rack-mountable server chassis with green handles and black grille front panel for 7720r4 distributed spine switch
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Arista

Arista DCS-DS-7720R4-128PE-F | 7720R4 Distributed Spine Switch, 128x 800G OSFP, Sup-EL

Arista DCS-DS-7720R4-128PE-F | 7720R4 Distributed Spine Switch, 128x 800G OSFP, Sup-EL

DCS-DS-7720R4-128PE-F

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Description

The Arista 7720R4 Distributed Spine Switch delivers 128 x 800GbE OSFP fabric ports as the spine core of the 7700R4 Distributed Etherlink Switch (DES) system — an ultra-scalable AI/ML leaf-spine architecture engineered for hyperscale accelerated computing. Operating as a single logical switch across distributed hardware, it supports over 4,600 x 800GbE hosts in a two-tier configuration and scales to tens of thousands of 400GbE/800GbE ports with a super-spine layer, reaching petabits per second of aggregate capacity. This bundle includes the Sup-EL supervisor module, 4 x AC power supplies, and 4 x SAF-D power cords with front-to-rear airflow, ready for immediate deployment.

Built on advanced 5nm silicon, the 7720R4 delivers 100% internally lossless forwarding through cell-based traffic spraying that eliminates elephant and mice flow collisions, with deterministic, fair performance at every scale. Fully integrated with Arista EOS and CloudVision, it provides automated fabric configuration, real-time telemetry, RDMA-optimised load balancing, DCQCN/PFC/ECN support, and Ultra Ethernet forward compatibility — making it the definitive spine fabric for next-generation GPU cluster and AI/ML infrastructure. Need it fast? iptrading.com.au delivers across Australia — shop now.

Features

- Part of the 7700R4 Distributed Etherlink Switch (DES) system — behaves as a single logical switch across distributed physical hardware
- Massively parallel distributed end-to-end scheduling for 100% efficient path utilisation
- Cell-based traffic spraying fabric eliminates elephant and mice flow collisions
- 100% internally lossless and fair forwarding with deterministic, consistent performance
- Fully automated fabric configuration and operation — zero manual tuning required
- Single-hop logical forwarding regardless of cluster scale
- Support for DCQCN, PFC, ECN, and Cluster Load Balancing (CLB)
- Ultra Ethernet forward-compatible for next-generation networking readiness
- Supports passive copper cables up to 4m and Linear-drive Pluggable Optics for reduced power footprint
- Inherent over-provisioning ratio on leaf switches provides built-in redundancy for uplink/spine failure events
- Arista EOS with CloudVision integration — full automation, telemetry, and network visibility
- Arista Etherlink Smart Networking with workload visibility and RDMA-optimised load balancing
- Proven architecture based on seven generations of Arista 7500/7800 series systems

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- 128 x 800G OSFP Fabric Ports
- Supervisor: Sup-EL (7001 series, 8-core/16-thread, 2.3 GHz CPU, 64 GB RAM, 512 GB NVMe)
- Silicon: Advanced 5nm geometry
- Airflow: Front to Rear (-F)
- Power Supplies: 4 x AC (included)
- Power Cords: 4 x SAF-D (included)
- Fabric Role: Spine switch within DES leaf-spine topology
- 2-Tier Scale: Supports 4,600+ x 800GbE hosts
- Maximum System Scale: Tens of thousands of 400GbE/800GbE ports with super-spine layer
- Total System Capacity: 27,000+ 800GbE ports / Petabits per second aggregate
- Secure Boot supported
- Part Number: DCS-DS-7720R4-128PE-F

FAQs

Q: What is the role of the 7720R4 in the 7700R4 DES system?
A: The 7720R4 acts as the spine switch within the 7700R4 Distributed Etherlink Switch (DES) leaf-spine topology. Together with DES leaf switches, it forms a single logical switch that provides massively scalable, lossless fabric connectivity for hyperscale AI/ML and GPU cluster environments.

Q: How many hosts can the 7720R4-based fabric support?
A: In a two-tier leaf-spine configuration, the 7700R4 DES system supports over 4,600 x 800GbE hosts. With an additional super-spine layer, the architecture scales to tens of thousands of 400GbE/800GbE ports and over 27,000 800GbE ports at petabit-per-second aggregate capacity.

Q: What is included in this bundle (DCS-DS-7720R4-128PE-F)?
A: This bundle includes the 7720R4 spine switch chassis with 128 x 800G OSFP fabric ports, the Sup-EL supervisor module (8-core/16-thread 2.3 GHz CPU, 64 GB RAM, 512 GB NVMe), 4 x AC power supplies, and 4 x SAF-D power cords. Front-to-rear airflow is configured out of the box.

Q: Is the 7720R4 suitable for AI and GPU cluster fabrics?
A: Yes. The 7720R4 is purpose-built for hyperscale accelerated computing. It supports RDMA-optimised load balancing, DCQCN, PFC, ECN, and cell-based traffic spraying that eliminates the elephant and mice flow problem common in GPU-to-GPU all-to-all communication patterns. It is also Ultra Ethernet forward-compatible.

Q: What management and automation capabilities does the 7720R4 support?
A: The 7720R4 runs Arista EOS and integrates with Arista CloudVision for full network automation, real-time streaming telemetry, and centralised visibility. The DES system also features fully automated fabric configuration so operators can manage the entire distributed fabric as a single logical device.

Q: Can I purchase the Arista 7720R4 in Australia through IP Trading?
A: Yes. iptrading.com.au is an Australian B2B IT hardware reseller stocking Arista data centre switching solutions including the 7720R4 DES Series. Contact the team for pricing, lead times, and configuration advice — or order directly online for fast delivery across Australia.

Datasheet

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