• Silver-colored Arista DCS-DL-7700R4C-38PE-B-F 7700R4 38-port 800GbE distributed leaf switch with black network ports and orange lights
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Arista

Arista DCS-DL-7700R4C-38PE-B-F | 7700R4 38-Port 800GbE Distributed Leaf Switch, Sup-EL

Arista DCS-DL-7700R4C-38PE-B-F | 7700R4 38-Port 800GbE Distributed Leaf Switch, Sup-EL

DCS-DL-7700R4C-38PE-B-F

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Description

The Arista 7700R4 Distributed Etherlink Leaf Switch delivers 38 x 800GbE OSFP ports — 18 host-facing and 20 fabric-facing — purpose-built for ultra-large-scale AI, ML, and HPC accelerated computing clusters. Powered by Broadcom Jericho3-AI 5nm silicon, it operates as part of the 7700R4 Distributed Etherlink Switch (DES) system, functioning as a single logical switch that scales to over 27,000 x 800GbE ports. Its cell-based traffic spraying, Virtual Output Queues, and distributed credit scheduling deliver 100% lossless, non-blocking fabric performance with no noisy-neighbour interference.

This unit ships with the Sup-EL supervisor, front-to-rear (B-side) airflow, 2 x AC power supplies, and 2 x SAF-D power cords. It pairs with the Arista 7720R4 spine in 2-tier or 3-tier leaf-spine topologies, supports DCQCN, PFC, ECN, Cluster Load Balancing, and is Ultra Ethernet Consortium (UEC) forward compatible. Running Arista EOS with CloudVision integration, it delivers deep telemetry, RDMA-optimised load balancing, and pay-as-you-grow linear scaling. Available now at iptrading.com.au — competitive prices and local support.

Features

- Ultra-scalable Distributed Etherlink Switch (DES) architecture — entire fabric operates as a single logical switch
- 100% internally lossless, non-blocking fabric — eliminates packet loss for AI/ML and HPC workloads
- Cell-based traffic spraying ensures uniform 100% fabric utilisation efficiency
- Virtual Output Queues (VOQ) eliminate head-of-line blocking (HOLB) across all ports
- Distributed Credit Scheduling provides independent egress control — no noisy-neighbour contention
- Deep buffering handles incast, traffic bursts, and speed mismatches without drops
- Full DCQCN, PFC, ECN and Cluster Load Balancing (CLB) support for RDMA workloads
- Ultra Ethernet Consortium (UEC) forward compatible
- Supports passive copper cables up to 4m and Linear-drive Pluggable Optics (LPO)
- Pay-as-you-grow linear CapEx/OpEx scaling — add leaf and spine nodes incrementally
- Deployable in 2-tier or 3-tier (leaf-spine-super-spine) topologies
- Runs Arista EOS with CloudVision integration for unified telemetry and management
- Eliminates job-specific cabling — every accelerator logically connected to the same switch

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

- Total ports: 38 x 800GbE OSFP
- Host connectivity ports: 18 x 800GbE OSFP
- Fabric ports: 20 x 800GbE OSFP (connects to 7720R4 spine)
- Supervisor: Sup-EL
- ASIC: Broadcom Jericho3-AI (5nm silicon geometry)
- Airflow: Front to rear (B-side)
- Power supplies: 2 x AC (included)
- Power cords: 2 x SAF-D (included)
- Passive copper cable support: up to 4m
- Optics support: Linear-drive Pluggable Optics (LPO)
- System scale: up to 27,000+ x 800GbE ports in full DES configuration
- Management: Arista EOS, CloudVision

FAQs

Q: What is the Arista 7700R4 Distributed Etherlink Switch (DES) architecture?
A: The 7700R4 DES is a distributed leaf-spine fabric that operates as a single logical switch. Leaf nodes (like the 7700R4C-38PE) connect host servers via 800GbE OSFP ports and interconnect to 7720R4 spine switches via fabric ports, enabling massive scale — up to 27,000+ x 800GbE ports — without the complexity of traditional multi-switch networks.

Q: What workloads is the DCS-DL-7700R4C-38PE-B-F designed for?
A: This switch is purpose-built for ultra-large-scale AI and ML training clusters, high-performance computing (HPC), and RDMA-intensive workloads. Its lossless fabric, deep buffering, and Virtual Output Queues eliminate packet loss and head-of-line blocking under the demanding incast traffic patterns typical of GPU cluster workloads.

Q: What does the 'B' in the SKU indicate, and what airflow direction does this unit use?
A: The 'B' designates front-to-rear airflow, where air enters from the front (port side) and exhausts out the rear. This is the standard hot-aisle/cold-aisle data centre configuration. The 'F' suffix denotes the included power cord type (SAF-D).

Q: Which spine switch does the 7700R4C-38PE pair with?
A: The 7700R4C-38PE leaf switch pairs with the Arista 7720R4 spine switch. Its 20 x 800GbE OSFP fabric ports connect directly to the 7720R4 spine, forming a 2-tier or 3-tier leaf-spine-super-spine DES topology.

Q: Does the 7700R4 support standard Ethernet protocols and congestion management?
A: Yes. The 7700R4 supports DCQCN, PFC, and ECN for congestion management, as well as Cluster Load Balancing (CLB) and RDMA-optimised load balancing. It is also Ultra Ethernet Consortium (UEC) forward compatible, ensuring alignment with next-generation AI networking standards.

Q: Can I purchase the Arista DCS-DL-7700R4C-38PE-B-F in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller offering the Arista 7700R4C-38PE with competitive pricing and local support. Contact the team directly for volume pricing, lead times, and configuration assistance for your AI or HPC deployment.

Datasheet

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