Arista DCS-7020TR-48-R Ethernet Switch

The Arista DCS-7020TR-48-R is a high-performance 7020R Series data center Ethernet switch designed for enterprise and cloud network environments. It provides 48 × 10/100/1000 RJ45 ports for server connectivity and 6 × SFP+ 1/10GbE uplink ports, enabling high-speed aggregation and network scalability.

This model features rear-to-front (R-F) airflow, meaning air flows from the power supply and fan side toward the data ports, making it ideal for cold aisle data center deployments. The switch is also known for its deep buffer architecture, allowing it to handle bursty workloads and high-density traffic environments commonly found in modern data centers.

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Core Performance Specifications

• Model: Arista DCS-7020TR-48-R

• Series: Arista 7020R Series

• Switch Type: Layer 2 / Layer 3 Data Center Ethernet Switch

• Ports:

  • 48 × 10/100/1000BASE-T RJ45 ports

  • 6 × SFP+ 1/10GbE uplink ports

• Switching Capacity: Up to 216 Gbps

• Forwarding Rate: Up to 162 Mpps (million packets per second)

• Latency: Starting at 3.8 microseconds (RJ45 to uplink)

• Packet Buffer: 3GB deep buffer with Virtual Output Queues (VoQ)

• MAC Address Table: Up to 256,000 entries

The large packet buffer allows the switch to handle microbursts and congestion scenarios without packet loss.

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Hardware Architecture

• CPU: Multi-core x86 processor

• System Memory: 8GB DRAM

• Flash Storage: 4GB

• Chassis Form Factor: 1RU rackmount

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Management Interfaces

The switch includes several dedicated management and service ports:

• 1 × 10/100/1000 Ethernet management port

• 1 × RS-232 RJ45 serial console port

• 2 × USB Type-A ports

These interfaces provide console access, firmware updates, and automation integration.

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Power and Cooling

The “R” variant indicates rear-to-front airflow, optimized for racks where the ports face the cold aisle.

• Power Supplies:

  • 1+1 redundant 500W hot-swappable AC power supplies (PWR-500AC-R)

  • Optional DC variants available

• Fan Modules:

  • 4 × hot-swappable fan modules (FAN-7000-R)

  • N+1 redundancy for continuous cooling

• Typical Power Consumption: ~105W

• Maximum Power Draw: ~115W (up to ~150W peak)

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Physical Specifications

• Form Factor: 1RU rackmount

• Dimensions: 17.3 × 1.71 × 15.8 inches
  (43.9 × 4.34 × 40.1 cm)

• Weight: Approximately 17 lbs (7.71 kg)

• Operating Temperature: 0°C to 40°C

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Operating System and Software Features

The switch runs Arista EOS (Extensible Operating System), a programmable Linux-based network operating system designed for automation and reliability.

Key capabilities include:

• Layer 2 & Layer 3 wire-speed forwarding

• Routing protocols: BGP, OSPF, and VXLAN

• Advanced automation and telemetry support

• ECMP support: up to 128-way ECMP

• Route scale: up to 200K IPv4/IPv6 routes

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Deployment Use Cases

The Arista 7020TR-48-R is commonly deployed for:

• Top-of-Rack (ToR) switching in enterprise data centers

• High-density server connectivity

• Virtualized and cloud infrastructures

• Network aggregation layers

• Workloads with bursty traffic requiring deep buffering