• Stack of four silver arista dcs-7280sr3e-40yc6-m-r 40-port 25g network switches with ventilation grilles and multiple ports
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Arista

Arista DCS-7280SR3E-40YC6-M-R | 7280R3 40-Port 25G Switch, 6x 100G QSFP28, SyncE

DCS-7280SR3E-40YC6-M-R

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Description

The Arista DCS-7280SR3E-40YC6-M-R is a high-performance 1RU data center switch router delivering 800 Gbps of non-blocking throughput with 40×25GbE SFP ports and 6×100GbE QSFP28 uplinks. Built on a Virtual Output Queue architecture with 2GB packet buffer and 32GB system memory, it provides comprehensive Layer 2/3 routing capabilities including BGP, MPLS, Segment Routing, EVPN, and VXLAN with 512-way ECMP. Featuring Synchronous Ethernet and rear-to-front airflow, this switch router is ideal for high-density leaf, spine, and data center interconnect deployments requiring precision timing and advanced routing scale.

Features

Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- 2 GB HBM2 packet buffer for burst absorption and lossless forwarding
- Synchronous Ethernet (SyncE) with ITU-T G.8261/G.8264 compliance
- IEEE 1588v2 Precision Time Protocol with Boundary and Transparent Clock modes
- Full BGP routing with support for Internet-scale routing tables (2M+ IPv4 prefixes)
- MPLS and Segment Routing for service provider and DCI use cases
- EVPN-VXLAN for Layer 2/3 network virtualization and multi-tenancy
- 512-way ECMP for optimal traffic distribution and resilience
- Advanced telemetry with LANZ, DANZ, sFlow, gNMI streaming, and IPFIX
- CloudVision integration for centralized management and automation
- Zero-Touch Provisioning (ZTP) for automated deployment
- Advanced Event Management (AEM) for programmable event-driven automation
- Native Python and Bash scripting on Arista EOS
- Comprehensive QoS with 8 hardware queues and hierarchical scheduling
- Hot-swappable dual redundant power supplies and N+1 fan trays
- In-service software updates with stateful process restart
- Extensive ACL support with 24K TCAM entries per ASIC

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

Port Configuration: 40×25GbE SFP (1G/10G/25G configurable) + 6×100GbE QSFP28 ports
- Switching Capacity: 800 Gbps full-duplex (1.6 Tbps aggregate)
- Forwarding Rate: 600 Mpps (million packets per second)
- Packet Buffer: 2 GB HBM2 with Virtual Output Queue architecture
- System Memory: 32 GB DRAM (expanded memory)
- Latency: 3.8 microseconds store-and-forward
- Routing Scale: Up to 2.85M IPv4 routes, 950K IPv6 routes, 256K MAC addresses
- ECMP Support: 512-way Equal-Cost Multi-Path
- Processor: Quad-core x86 CPU
- Flash Storage: 8 GB
- Management: 1×100/1000 Mbps Ethernet port, 1×RS-232 console (RJ-45)
- Power Supply: Dual redundant hot-swappable AC PSU (1+1)
- Airflow: Rear-to-front (port side to fan side)
- Dimensions: 48.3×4.4×46.9 cm (19×1.75×18.5 inches), 1RU
- Weight: 9.6 kg (21.0 lbs)
- Operating Temperature: 0°C to 40°C (32°F to 104°F)
- Timing Features: IEEE 1588v2 PTP, Synchronous Ethernet (SyncE), ITU-T G.8261/G.8275.1/G.8275.2
- Operating System: Arista EOS

FAQs

Q: What is the difference between the SR3E and standard SR3 models?
A: The SR3E models feature Synchronous Ethernet (SyncE) support on all front panel interfaces for precision timing distribution, plus expanded system memory (32GB vs 8GB). The M suffix indicates expanded memory specifically. These models are designed for service provider and 5G applications requiring telecom-grade timing synchronization.

Q: What does the -M-R suffix indicate?
A: The M indicates expanded memory configuration (32GB system RAM vs standard 8GB), and the R designates rear-to-front airflow where cool air enters from the port side and exhausts from the fan side. This airflow direction is also called reverse or cold-aisle airflow.

Q: Can the QSFP28 ports be broken out into lower-speed interfaces?
A: Yes, each 100GbE QSFP28 port supports breakout configurations to 4×25GbE or 4×10GbE, allowing up to 24 additional 25G or 10G ports. The system supports a maximum of 52 logical interfaces across all ports.

Q: What routing protocols and advanced features are supported?
A: The switch supports comprehensive Layer 3 routing including BGP, OSPF, IS-IS, MPLS (LDP, RSVP-TE, BGP-LU), Segment Routing, EVPN, VXLAN, and 512-way ECMP. It delivers full Internet routing table support with over 2M IPv4 routes and advanced services including EVPN-VXLAN, MPLS VPN, L2/L3 VPN, and Data Center Interconnect capabilities.

Q: Is this switch suitable for data center spine or leaf deployments?
A: Yes, the DCS-7280SR3E-40YC6-M-R is well-suited for both leaf and spine roles in modern data center fabrics. Its deep buffer architecture, high routing table capacity, and support for EVPN-VXLAN make it ideal for universal leaf/spine deployments, DCI gateways, Internet peering, and high-performance storage networks requiring low latency and lossless forwarding.

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