• Stack of four silver arista dcs-7280sr3-40yc6-flx-r network switches with multiple ports and ventilation grilles
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Arista

Arista DCS-7280SR3-40YC6-FLX-R | 7280R3 40-Port 25G Switch, 6x 100G QSFP28, FLX

DCS-7280SR3-40YC6-FLX-R

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Description

The Arista DCS-7280SR3-40YC6-FLX-R is a high-performance 1RU data center switch router delivering 800 Gbps non-blocking throughput with 40x 25GbE SFP ports and 6x 100GbE QSFP28 uplinks. Built on a next-generation VOQ ASIC with 2GB HBM2 packet buffer and 3.8µs latency, it provides comprehensive Layer 2/3 capabilities including BGP, MPLS, Segment Routing, EVPN, and VXLAN with 512-way ECMP. The FLX license tier enables up to 256K routes, EVPN, VXLAN, and base MPLS LSR functionality, while rear-to-front airflow ensures optimal cooling in data center hot-aisle/cold-aisle deployments.

Features

Arista EOS operating system with modular architecture and in-service software upgrades
- Full Layer 3 routing: BGP, OSPF, IS-IS, static routing with 512-way ECMP
- MPLS Label Switching: LDP, RSVP-TE, BGP-LU, and Segment Routing (SR-TE)
- VXLAN overlay with hardware VTEP, EVPN control plane, and IRB (Integrated Routing and Bridging)
- Advanced QoS: 8 hardware queues per port, strict priority and DWRR scheduling, WRED, ECN
- Layer 2 switching: VLANs, STP/RSTP/MSTP, link aggregation (LACP), MLAG multi-chassis LAG
- Network virtualization: VRF-Lite, VRF-aware VXLAN, multi-tenancy support
- Security: 802.1X, dynamic ARP inspection, DHCP snooping, IP source guard, control-plane policing
- Precision timing: IEEE 1588v2 PTP hardware timestamping, Boundary Clock and Transparent Clock modes
- Advanced telemetry: LANZ (buffer monitoring), sFlow, IPFIX, INT (In-band Network Telemetry)
- DANZ monitoring fabric: port mirroring, SPAN/TAP aggregation, packet filtering and slicing
- CloudVision integration for centralized automation, telemetry streaming, and compliance monitoring
- Zero-Touch Provisioning (ZTP) for automated deployment and configuration
- Hot-swappable power supplies and fan modules for 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

40x 25GbE SFP ports (supporting 25G/10G/1G speeds)
- 6x 100GbE QSFP28 uplinks (breakout to 4x25G or 4x10G per port)
- 800 Gbps full-duplex switching capacity (1.6 Tbps aggregate)
- 1.0 Bpps (billion packets per second) forwarding rate
- 2GB HBM2 packet buffer memory with VOQ architecture
- 3.8µs store-and-forward latency
- Up to 2M IPv4 LPM routes, 1.4M IPv6 LPM routes, 384K MAC addresses
- Quad-core x86 CPU with 8GB system DRAM, 8GB flash storage
- Rear-to-front airflow (fan side to port side cooling)
- Dual hot-swappable AC power supplies (2x 1900W, 1+1 redundant)
- Typical power consumption: 300W
- 1RU form factor, rack-mountable
- Management: CLI, web GUI, SNMP, NETCONF, CloudVision, ZTP

FAQs

Q: What does the FLX license tier include?
A: The FLX license provides full routing capabilities with up to 256K routes, EVPN, VXLAN, Segment Routing, and base MPLS LSR functionality without traffic engineering. This is ideal for modern data center leaf-spine architectures requiring overlay networking and comprehensive routing protocols.

Q: What does the -R suffix indicate?
A: The -R suffix denotes rear-to-front airflow, where cool air enters from the fan side and exhausts through the port side. This airflow direction is designed for cold-aisle/hot-aisle data center deployments where the port side faces the hot aisle.

Q: Can the 100G QSFP28 ports be broken out to lower speeds?
A: Yes, each 100G QSFP28 uplink port supports breakout to 4x25G or 4x10G, providing up to 24 additional 25G or 10G ports for flexible network designs. This allows a maximum configuration of 40x25G + 24x25G (64 total 25G ports).

Q: What is the benefit of the VOQ architecture and 2GB buffer?
A: The Virtual Output Queue architecture eliminates head-of-line blocking by maintaining separate queues for each input-output port pair. Combined with the 2GB HBM2 deep buffer, this delivers superior burst absorption and consistent low latency even under congestion, making it ideal for high-performance computing and storage networks.

Q: Is this switch compatible with multi-vendor data center fabrics?
A: Yes, the 7280SR3-40YC6-FLX-R supports industry-standard protocols including BGP, OSPF, IS-IS, VXLAN, EVPN, and MPLS, enabling seamless integration into multi-vendor leaf-spine topologies and interoperability with third-party spine switches, routers, and network controllers.

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