Arista 7280R3MK 32-Port 100GbE QSFP with 4x 400GbE QSFP-DD Layer 3 Managed Switch (Front-to-Back) — DCS-7280CR3MK-32D4S-F

The Arista DCS-7280CR3MK-32D4S-F is a 7280R3MK series 32-port 100GbE QSFP Layer 3 managed switch with 4x 400GbE QSFP-DD uplinks and front-to-back (F) airflow. Running Arista EOS with deep buffer and MACsec encryption, it delivers high-performance, secure data center spine switching with next-generation 400GbE uplink capability.

Key Features

• 32x 100GbE QSFP ports for high-density 100GbE spine/aggregation connectivity
• 4x 400GbE QSFP-DD uplinks for next-generation fabric connectivity
• Front-to-back (F) airflow — cold aisle/hot aisle data center compatible
• MACsec hardware encryption on all ports
• Deep buffer architecture for bursty and storage workloads
• Arista EOS — programmable, automation-ready network OS

Product Specifications

• Part Number: DCS-7280CR3MK-32D4S-F
• Manufacturer: Arista
• OEM Status: Retail
• Model: 7280R3MK
• QSFP Ports: 32x 100GbE
• Uplink Ports: 4x 400GbE QSFP-DD
• Airflow: Front-to-Back (F)
• MACsec: Yes (hardware, all ports)
• Switching Layer: Layer 3
• OS: Arista EOS
• Form Factor: 1U Rack-mountable

Switch & Port Specifications

• Switching Capacity: Up to 12.8 Tbps
• Buffer: Deep buffer
• MACsec: 256-bit AES hardware encryption, all ports

Network & Protocol Specifications

• Routing: BGP, OSPF, IS-IS, MPLS, Segment Routing
• VLANs: 802.1Q, up to 4,094
• VXLAN: Supported
• EVPN: Supported
• Telemetry: Arista DANZ streaming telemetry

Use Cases

• Secure data center spine switching with MACsec hardware encryption
• Government, financial, and regulated industry data center fabrics requiring link encryption
• Deep buffer spine for bursty and storage-heavy workloads
• Next-generation 400GbE fabric migration with 100GbE access compatibility

Compatibility

• QSFP28/QSFP100 100GbE optical transceivers and DAC cables
• QSFP-DD 400GbE optical transceivers and DAC cables for uplinks
• Arista EOS management and CloudVision automation ecosystem

Frequently Asked Questions

What does the MK suffix indicate?

The MK suffix indicates MACsec (Media Access Control Security) hardware encryption capability on all ports — providing line-rate 256-bit AES encryption for secure data center interconnects without performance penalty.

What is the difference between DCS-7280CR3MK-32D4S-F and DCS-7280CR3MK-32D4S-R?

Both are identical in hardware and performance — the only difference is airflow direction. The -F is front-to-back and the -R is rear-to-front. Select based on your rack's airflow containment configuration.

The Arista DCS-7280CR3MK-32D4S-F delivers 32-port 100GbE QSFP Layer 3 switching with 4x 400GbE QSFP-DD uplinks, hardware MACsec encryption, deep buffer, and front-to-back airflow — a high-performance, secure data center spine switch for regulated and security-sensitive environments.