Arista 32-Ports 100GbE QSFP 4x400GbE QSFP-DD Uplinks L3 Managed Rear-to-Front High Performance Network Switch – DCS-7280CR3MK-32D4S-R

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

The Arista DCS-7280CR3MK-32D4S-R is a 7280R3MK series 32-port 100GbE QSFP Layer 3 managed switch with 4x 400GbE QSFP-DD uplinks and rear-to-front (R) 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
• Rear-to-front (R) airflow — hot aisle/cold 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-R
• Manufacturer: Arista
• OEM Status: Retail
• Model: 7280R3MK
• QSFP Ports: 32x 100GbE
• Uplink Ports: 4x 400GbE QSFP-DD
• Airflow: Rear-to-Front (R)
• 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 7280CR3MK and 7280CR3?

The 7280CR3MK adds hardware MACsec encryption on all ports compared to the standard 7280CR3. All other hardware specifications are identical.

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