• Gray metal arista dcs-7280dr3a-36-dc-f 36-port 400g network switch with indicator lights and 16gb buffer shown from front
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Arista

Arista DCS-7280DR3AK-36S-F | 7280R3A 36-Port 400G Switch, 14.4 Tbps, TunnelSec

DCS-7280DR3AK-36S-F

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Description

The Arista DCS-7280DR3AK-36S-F is a high-performance data center switch router featuring 36 ports of 400GbE QSFP-DD connectivity with 14.4 Tbps switching capacity. Built on the 7280R3A platform, it delivers large-scale routing with over 5 million IP routes via FlexRoute technology, line-rate TunnelSec encryption, and 16GB deep packet buffers with VOQ architecture for lossless forwarding. Ideal for hyperscale data centers, internet peering, cloud spine deployments, and AI/ML fabric infrastructure requiring wire-speed Layer 2/Layer 3 performance.

Features

Layer 2 switching with VLAN, STP, RSTP, MSTP, MLAG, and LACP support
- Layer 3 routing with BGP, OSPF, IS-IS, EIGRP, static routing, and VRF support
- EVPN-VXLAN overlay networking for data center fabric architectures
- MPLS and Segment Routing for service provider and carrier applications
- Virtual Output Queue (VOQ) architecture eliminates head-of-line blocking
- Dynamic deep packet buffering (16GB) for lossless forwarding under congestion
- Line-rate TunnelSec encryption: MACsec, IPsec, VXLANsec with AES-256-GCM
- FlexRoute engine with over 5 million route capacity for internet peering
- Algorithmic ACLs for scalable access control and policy-based forwarding
- Accelerated sFlow and IPFIX for granular network telemetry and monitoring
- LANZ (Latency Analyzer) for microsecond-level congestion detection
- DANZ (Data Analyzer) for advanced traffic mirroring and packet capture
- Precision Time Protocol (IEEE 1588 PTPv2) with OCXO and nanosecond accuracy
- Synchronous Ethernet (SyncE) for frequency synchronization
- CloudVision integration for network-wide automation and telemetry
- Zero Touch Provisioning (ZTP) for automated deployment
- Hot-swappable redundant PSUs and fan modules for high availability
- Arista EOS with REST API, Python scripting, and open programmability
- Supports 400G-ZR coherent optics for long-haul DWDM connectivity
- Comprehensive QoS with hierarchical scheduling, traffic shaping, and policing

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

36x 400GbE QSFP-DD ports (supports breakout to 144x 100G or 232x 25G)
- Switching capacity: 14.4 Tbps full-duplex (28.8 Tbps aggregate)
- Forwarding rate: 5.4 billion packets per second
- Packet buffer: 16GB deep buffer with Virtual Output Queue (VOQ) architecture
- Routing scale: Over 5 million IP routes with FlexRoute engine (7280R3AK variant)
- Encryption: Line-rate TunnelSec with AES-256-GCM, IEEE 802.1AE MACsec on all ports
- Latency: From 3.8 microseconds
- CPU: Eight-core x86 processor
- System memory: 64GB RAM
- Front-to-rear airflow, 2x AC power supplies (2400W)
- Form factor: 2RU rack-mount
- Management: Arista EOS with CLI, REST API, CloudVision integration
- Precision timing: IEEE 1588 PTPv2, Synchronous Ethernet with OCXO
- Hot-swappable redundant power supplies and fan modules

FAQs

Q: What port configurations does the DCS-7280DR3AK-36S-F support?
A: The switch supports flexible port configurations including 36x 400G, up to 144x 100G, 232x 50G, or 232x 25/10G through breakout cables. Each QSFP-DD port can operate at 400G, 2x 200G, 4x 100G, 8x 50G, or 8x 25G depending on optics and cables used.

Q: What is TunnelSec and how does it differ from standard MACsec?
A: TunnelSec is Arista's advanced encryption technology that provides line-rate AES-256-GCM encryption for Layer 2 and Layer 3 traffic, including tunneled protocols like VXLAN and IPsec. Unlike standard MACsec which only encrypts Ethernet frames, TunnelSec encrypts overlay traffic at wire speed across all port speeds from 10G to 400G without performance penalty.

Q: How does the FlexRoute engine benefit large-scale routing deployments?
A: The FlexRoute engine uses a patented algorithmic approach to support internet-scale routing tables with over 5 million IPv4 and IPv6 routes in hardware on the 7280R3AK models. This makes the switch ideal for internet peering, carrier edge, and service provider applications requiring full BGP routing table support with fast convergence.

Q: Is the DCS-7280DR3AK-36S-F suitable for AI/ML cluster networking?
A: Yes, with 14.4 Tbps non-blocking performance, 16GB deep buffers, VOQ architecture for lossless forwarding, and sub-4 microsecond latency, this switch is well-suited for AI/ML spine and leaf deployments. It supports RDMA over Converged Ethernet (RoCE), advanced traffic management, and accelerated sFlow for network telemetry in high-performance computing environments.

Q: What optics and cables are compatible with this switch?
A: The switch supports a wide range of 400G QSFP-DD optics including SR8, DR4, FR4, LR4, and 400G-ZR coherent modules for DWDM applications. It also supports breakout cables and AOC/DAC options. All ports are backward compatible with 100G QSFP28 and 25G SFP optics when used in breakout mode.

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