• Gray metal arista dcs-7280cr3k-36a-flx-r network switch back side with multiple 100g qsfp ports and ventilation slots
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Arista

Arista DCS-7280CR3K-36A-FLX-R | 7280R3 Switch, 36x 100G QSFP + 2x 400G, FLX License

DCS-7280CR3K-36A-FLX-R

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Description

The Arista DCS-7280CR3K-36A-FLX-R is a high-performance 1RU data center switch router designed for spine, aggregation, and border routing deployments. Featuring 36 100GbE QSFP ports and 2 400GbE QSFP-DD uplinks with 28.8 Tbps switching capacity, it delivers deep packet buffering and advanced Layer 3 routing. The FLX license enables routing scale up to 2M routes with MPLS, EVPN, VXLAN, and Segment Routing capabilities. Ideal for cloud-scale data centers, service providers, and high-frequency trading environments requiring deterministic low-latency performance and robust automation.

Features

Multi-speed ports supporting 1/10/25/40/50/100/200/400GbE with breakout capability
- Layer 2/3 switching with hardware-accelerated VXLAN encapsulation/decapsulation
- EVPN control plane for multi-tenant overlay networks and DCI
- Virtual Routing and Forwarding (VRF-lite) for network segmentation
- Multi-Chassis Link Aggregation (MLAG) for redundancy without stacking cables
- Advanced QoS with 8 hardware queues per port, traffic shaping, and congestion management
- Data Center TCP (DCTCP) and Explicit Congestion Notification (ECN)
- Hardware-based ACLs at Layer 2/3/4 for granular traffic filtering
- MPLS Label Distribution Protocol (LDP), RSVP-TE, and Segment Routing (SR-TE)
- 512-way Equal-Cost Multi-Path (ECMP) for load balancing
- Precision timing with IEEE 1588 PTPv2 and SyncE support
- Arista EOS modular operating system with in-service software upgrades
- Comprehensive telemetry: sFlow, LANZ, DANZ, IPFIX for traffic analytics
- Hot-swappable redundant power supplies and fan trays for high availability
- Zero-Touch Provisioning (ZTP) for automated deployment at scale

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

36 x 100GbE QSFP28 ports (multi-rate: 1/10/25/40/50/100G)
- 6 x 200GbE capable QSFP ports
- 2 x 400GbE QSFP-DD uplinks (400G/200G/100G)
- Switching capacity: 28.8 Tbps (bidirectional)
- Deep packet buffer: 4GB for burst absorption
- Form factor: 1RU fixed-configuration switch router
- Layer 3 routing: supports BGP, OSPF, IS-IS, MPLS, Segment Routing
- FLX license: up to 2M IPv4/IPv6 routes, >24K ACL entries, advanced MPLS-LER/LSR
- Airflow: rear-to-front (reverse airflow for hot aisle containment)
- Power: Dual hot-swappable 2 x AC power supplies, redundant
- Typical power consumption: ~900W depending on configuration
- Management: Arista EOS, CLI, REST API, NETCONF, CloudVision integration
- Memory: 64GB DRAM, 120GB SSD
- Latency: Sub-5 microsecond store-and-forward
- Certifications: RoHS compliant, energy-efficient design

FAQs

Q: What is the difference between the 36A and 36S variants?
A: The 36A variant provides enhanced port flexibility with 28 x 100GbE QSFP + 6 x 200GbE QSFP + 2 x 400GbE QSFP-DD uplinks, while the 36S offers standard 36 x 100GbE QSFP ports with 2 x 400GbE uplinks. Both support large routing tables with the K-variant architecture.

Q: What does the FLX license include?
A: The FLX license enables full routing capabilities with up to 2 million IPv4/IPv6 routes, >24K ACL entries, EVPN, VXLAN, Segment Routing, and advanced MPLS-LER/LSR features. This is essential for spine, border leaf, and internet peering applications requiring large-scale routing.

Q: What is the rear-to-front airflow configuration used for?
A: The -R suffix indicates rear-to-front (reverse) airflow, where cool air is drawn in from the fan/PSU side and exhausted through the port side. This is designed for hot aisle containment deployments where equipment exhausts toward the rear hot aisle.

Q: Can this switch be used in leaf-spine architectures?
A: Yes, the DCS-7280CR3K-36A is ideally suited for spine, super-spine, and border leaf roles in modern leaf-spine fabrics. Its deep buffers, high port density, and large routing table support make it excellent for aggregation layers and data center interconnect.

Q: Is CloudVision management included?
A: CloudVision integration is supported through Arista EOS, but CloudVision licenses are purchased separately. The switch supports Zero-Touch Provisioning, real-time telemetry, and programmable APIs for automation and network-wide visibility.

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