• Silver arista dcs-dl-7700r4c-38pe-b-f distributed leaf switch with 38 ports and orange indicator lights on front panel
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Arista

Arista DCS-DL-7700R4C-38PE-B-F | 7700R4 38-Port 800GbE Distributed Leaf Switch, 18 Host + 20 Fabric

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

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Description

The Arista DCS-DL-7700R4C-38PE-B-F is a purpose-built distributed leaf switch delivering 38 x 800GbE OSFP ports for ultra-large-scale AI, ML, and HPC accelerated computing clusters. With 18 host-facing and 20 fabric-facing ports, it operates as part of the 7700R4 Distributed Etherlink Switch architecture, functioning as a single logical switch that scales to over 27,000 ports. Powered by Broadcom Jericho3-AI 5nm silicon, it delivers 100% lossless, non-blocking fabric performance with Virtual Output Queues, distributed credit scheduling, and deep buffering for demanding AI workloads.

Features

Ultra-scalable Distributed Etherlink Switch (DES) architecture operates entire fabric as single logical switch
- 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 with no noisy-neighbour contention
- Deep buffering handles incast, traffic bursts, and speed mismatches without packet loss
- Full DCQCN, PFC, ECN and Cluster Load Balancing (CLB) support for RDMA workloads
- Supports 800G, 400G, 200G, 100G, 50G, and 25G breakout configurations
- 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 advanced automation, telemetry, and programmability
- CloudVision integration for unified network-wide management and visibility
- Supports passive copper cables and LPO for reduced power consumption
- Low latency, deterministic performance for AI/ML collective operations
- Logical single-hop architecture eliminates complex routing and overlays
- 5nm Broadcom Jericho3-AI silicon for maximum power efficiency
- Secure Boot enabled for enhanced security posture
- Hot-swappable components for continuous operation and high availability

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

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

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Technical Specifications

FAQs

Technical Specifications

38 x 800GbE OSFP ports (18 host-facing, 20 fabric-facing)
- Broadcom Jericho3-AI 5nm silicon
- Supervisor Module: 7001-SUP-EL with 8-Core x86 CPU
- System Memory: 64GB RAM
- Storage: 512GB NVMe SSD
- Architecture: Cell-based traffic spraying, Virtual Output Queues (VOQ), distributed credit scheduling
- 100% internally lossless, non-blocking fabric
- Deep buffering for incast and burst traffic handling
- Airflow: Front-to-rear (B-side)
- Power Supply: 2 x AC power supplies with 2 x SAF-D power cords included
- Management: Arista EOS with CloudVision integration
- Secure Boot: Enabled by default
- Hot-swappable power supplies and fan modules
- Support for passive copper cables up to 4m and Linear-drive Pluggable Optics (LPO)
- 19-inch rack mountable (2RU)
- DCQCN, PFC, ECN congestion management
- Ultra Ethernet Consortium (UEC) forward compatible

FAQs

Q: What is the Arista 7700R4 Distributed Etherlink Switch architecture?
A: The 7700R4 DES is a distributed leaf-spine fabric that operates as a single logical switch. Leaf nodes 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 demanding incast traffic patterns typical of GPU cluster workloads.

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 for pay-as-you-grow scaling.

Q: What does the 'B' and 'F' in the SKU indicate?
A: The 'B' designates front-to-rear airflow, where air enters from the front (port side) and exhausts out the rear in standard hot-aisle/cold-aisle data centre configuration. The 'F' suffix denotes the included SAF-D power cord type. The unit ships fully configured with 2 x AC power supplies.

Q: Does the 7700R4 support standard Ethernet protocols?
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.

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