Specifications

• Model: Arista DCS-7280CR3K-36S-F
• Series: Arista 7280R3 Series
• Type: Fixed-configuration, high-performance data center switch
• Form Factor: 2 RU (Rack Unit)
• Airflow: Front-to-back airflow (denoted by the -F in the model number).
• 2. Interfaces and Ports
• 36 x 400GbE QSFP-DD ports:
• Each QSFP-DD port can operate at 400GbE or be broken down into smaller bandwidths using breakout cables:
• 4x100GbE (using 4x100GbE breakout cables)
• 8x50GbE (using 8x50GbE breakout cables)
• 4x25GbE or 10GbE (using 4x25GbE or 4x10GbE breakout cables).
• Provides flexible port configurations for high-density, high-speed connectivity.
• Management Ports:
• 1 x 10/100/1000 management RJ45 Ethernet port.
• 1 x USB 2.0 Type-A port.
• 1 x RJ45 console port.
• 3. Performance
• Switching Capacity: 28.8 Tbps (terabits per second).
• Forwarding Rate: 11.2 Bpps (billion packets per second).
• Latency: Ultra-low latency, typically sub-microsecond, optimized for high-performance and latency-sensitive applications such as high-frequency trading.
• Packet Buffer: 64 MB of packet buffer shared across all ports to handle traffic bursts.
• MAC Address Table: Supports up to 288,000 MAC addresses.
• 4. Layer 2 and Layer 3 Features
• Layer 2 Features:
• VLAN Support: Up to 4,000 VLANs with IEEE 802.1Q VLAN tagging.
• Spanning Tree Protocols: STP, RSTP, and MSTP support for loop prevention and redundancy.
• Link Aggregation: Supports IEEE 802.3ad LACP for bundling multiple physical links into one logical link.
• Jumbo Frames: Supports jumbo frames with an MTU of up to 9,216 bytes for larger data packets.
• Layer 3 Features:
• Full support for IPv4 and IPv6 routing.
• Dynamic Routing Protocols: Supports OSPF, BGP, IS-IS, and RIP.
• Multicast Routing: PIM-SM, PIM-DM, PIM-SSM, and IGMP snooping for multicast traffic management.
• Equal-Cost Multi-Path (ECMP): Supports up to 128-way ECMP routing for load balancing and redundancy.
• Virtual Routing and Forwarding (VRF-lite): Provides network segmentation for creating multiple virtual routing instances.
• VXLAN: Supports Virtual Extensible LAN for network virtualization, allowing Layer 2 extensions over Layer 3 infrastructure.
• 5. Quality of Service (QoS)
• Traffic Prioritization: Supports 8 hardware queues per port for prioritizing critical traffic.
• Traffic Shaping and Policing: Provides advanced traffic management features to ensure efficient use of bandwidth.
• Congestion Management: Supports congestion avoidance features such as Weighted Random Early Detection (WRED) and Explicit Congestion Notification (ECN).
• Data Center TCP (DCTCP): Optimized for low-latency environments and helps to reduce network congestion.
• 6. Security Features
• Access Control Lists (ACLs): Provides Layer 2, Layer 3, and Layer 4 ACLs for controlling traffic based on source/destination, protocol, and other parameters.
• Dynamic ARP Inspection (DAI): Protects against ARP spoofing attacks by validating ARP requests and responses.
• DHCP Snooping: Prevents rogue DHCP servers from assigning incorrect IP addresses.
• IP Source Guard: Prevents IP address spoofing by ensuring that only authorized IP addresses can access the network.
• AAA Support: Provides integration with RADIUS and TACACS+ for secure user authentication and authorization.
• 7. Network Management and Monitoring
• Command Line Interface (CLI): Provides a full-featured CLI for configuration, troubleshooting, and management.
• Zero Touch Provisioning (ZTP): Automates the initial setup of the switch, simplifying deployment in large-scale environments.
• SNMP: Supports SNMP v1, v2, and v3 for remote network management and monitoring.
• sFlow: Provides real-time traffic monitoring and flow analysis for performance visibility.
• Telemetry: Offers streaming telemetry for real-time network performance and monitoring.
• Arista EOS: Runs on Arista's Extensible Operating System (EOS), which is fully programmable and provides APIs for automation.
• 8. Stacking and Redundancy
• Multi-Chassis Link Aggregation (MLAG): Provides redundancy without the need for physical stacking cables, allowing for link aggregation across multiple switches.
• Redundant Power Supplies: Supports dual hot-swappable, redundant power supplies to ensure high availability.
• Hot-Swappable Fans: Hot-swappable, redundant fan trays ensure continued cooling even in case of fan failure.
• 9. Power and Cooling
• Power Supply:
• Dual hot-swappable, redundant power supplies for uninterrupted operations.
• Power Options: Available in both AC and DC power supplies.
• Typical power consumption: Approximately 900W, depending on the configuration and traffic load.
• Cooling:
• Front-to-back airflow ensures optimal cooling for data center deployments with hot aisle/cold aisle configurations.
• Hot-swappable, redundant fan trays provide efficient cooling and maintain system reliability.
• 10. Environmental Specifications
• Operating Temperature: 0°C to 40°C (32°F to 104°F).
• Storage Temperature: -40°C to 70°C (-40°F to 158°F).
• Operating Humidity: 5% to 95% non-condensing.
• Acoustic Noise: Typically less than 70 dBA under full load conditions.
• 11. Compliance and Certifications
• RoHS Compliance: Fully compliant with the Restriction of Hazardous Substances (RoHS) directive.
• Safety Certifications: UL, CSA, CE, IEC/EN, and other global certifications.
• EMI/EMC Compliance: Meets international standards for electromagnetic emissions and susceptibility, including FCC, CE, and EN certifications.
• 12. Use Cases
• Data Center Spine and Leaf: Ideal for use in spine or leaf roles in modern data centers that require high-speed, low-latency, and high-density 400GbE connectivity.
• Cloud and Service Provider Networks: Optimized for large-scale cloud networks and service providers needing flexible, scalable network infrastructure.
• Content Delivery Networks (CDN): Well-suited for environments that demand high bandwidth and low-latency networking to deliver rich content across the globe.
• High-Frequency Trading: Provides ultra-low latency and high performance, making it suitable for financial markets and high-frequency trading applications.