Arista DCS-7280SR3K-48YC8A-F | 48x25G + 8x100G Switch Router

Arista DCS-7280SR3K-48YC8A-F — High-Density 25G Access Layer with Expanded Routing Scale and Enhanced CPU

Platform Overview

Port Configuration

• 48 × 25G SFP: Configurable in groups of 4 for either 25G or 10G/1G operation, supporting dense access-layer connectivity with port rate flexibility for mixed-speed deployments. Delivers 1.2 Tbps of aggregate access-layer throughput.
• 8 × 100G QSFP: High-speed uplink ports for spine connectivity, inter-data-center links, or core aggregation. Provides 0.8 Tbps of uplink capacity.

Performance Characteristics

• Wire Speed Throughput: 2 Tbps across all ports simultaneously (1.2 Tbps access + 0.8 Tbps uplinks).
• Packet Buffer: 4 GB of packet memory for burst absorption and traffic prioritization.
• Latency: From 3.8 microseconds, enabling low-latency application and financial services workloads.
• 1U Form Factor: Compact single-rack-unit design for space-efficient deployment in standard 19-inch racks.

K Variant: Expanded Scale

A Variant: Eight-Core x86 CPU

Layer 2 Switching

• Spanning Tree: 802.1w (RSTP), 802.1s (MSTP), RPVST+.
• VLAN Support: Up to 4,096 VLAN IDs with Q-in-Q (802.1ad) encapsulation for service provider deployments.
• Link Aggregation: LACP (IEEE 802.3ad) with up to 256 ports per channel and 2,048 aggregation groups; MLAG (Multi-Chassis LAG) support for up to 512 ports per MLAG group.
• Jumbo Frames: Support for MTU up to 9,214 bytes.
• Multicast: IGMP snooping and host-side IGMP support.

Layer 3 Routing

• Core Protocols: OSPF, OSPFv3, BGP, MP-BGP, IS-IS, and BFD for rapid fault detection.
• Virtual Routing: VRF (Virtual Routing and Forwarding), VARP (Virtual ARP), VRRP and VRRPv3 for gateway redundancy.
• Path Control: 512-way ECMP (Equal-Cost Multi-Path), uRPF (Unicast Reverse Path Forwarding), and PBR (Policy-Based Routing).
• Advanced Routing: BGP FlowSpec for dynamic traffic filtering, BGP-RPKI for route origin validation, BMP (BGP Monitoring Protocol), and BGP Linkstate.
• Convergence: PIC (Prefix-Independent Convergence) and Micro BFD for sub-50-ms recovery in large networks.

MPLS and Segment Routing

• MPLS Core: LDP (Label Distribution Protocol), RSVP-TE with automatic Fast Reroute (FRR), and BGP-LU (BGP-based Label Unicast).
• Segment Routing: SR-TE (Segment Routing Traffic Engineering) and TI-LFA (Topology-Independent LFA) for simplified MPLS operations and sub-50-ms failure recovery without per-LSP backup paths.

VPN Services

• MPLS-Based VPN: IP-VPN (RFC 4364) and VPLS (Virtual Private LAN Service).
• VXLAN and EVPN: EVPN-VXLAN for overlay networking, EVPN-MPLS for provider backbone architectures, and EVPN IRB (Integrated Routing and Bridging) for seamless Layer 2/Layer 3 convergence.

Precision Timing

• Clock Synchronization: IEEE 1588v2 (PTP) and Synchronous Ethernet (SyncE) for precision timing in telecom and financial networks.
• Telecom Standards: ITU-T G.8275.1 and G.8275.2 for PTP profile compliance, G.8261 and G.8264 for SyncE quality specifications.

Telemetry and Monitoring

• Traffic Analytics: LANZ (Latency Analyzer and Notification Zone) for real-time latency visibility and packet loss detection.
• Flow Export: Accelerated sFlow for hardware-accelerated flow sampling, IPFIX (IP Flow Information Export) for standardized flow records.
• Programmable Telemetry: Inband Network Telemetry (INT) for detailed packet path information, DANZ for advanced mirroring, SPAN/TAP aggregation, and L2/3/4 filtering, and Advanced Event Management (AEM) for programmable event-driven automation within EOS.
• Management Interfaces: gNMI (gRPC Network Management Interface) for streaming telemetry and model-driven monitoring aligned with YANG data models.

Network Automation

• Zero-Touch Provisioning: ZTP (Zero-Touch Provisioning) for automatic configuration discovery and bootstrapping.
• Configuration Management: CloudVision for centralized provisioning, compliance validation, and multi-device orchestration.
• APIs and Scripting: eAPI for HTTP-based automation, NETCONF and RESTCONF for standards-based configuration, and gNMI for streaming telemetry and model-driven operations; Python and Bash support for custom scripting.
• Data Models: OpenConfig YANG models for interoperable multi-vendor network design.

Security

• Control Plane Protection: CPP (Control Plane Policing) to rate-limit and filter traffic destined for the management CPU.
• Access Control: Hardware ACL engine with up to 100,000 algorithmic ACLs; User-Defined Fields (UDF) for custom packet header matching.
• Authentication: RADIUS and TACACS+ for centralized user credential management.
• Secure Boot: Firmware validation to prevent unauthorized software execution during system startup.

Quality of Service

• Queuing: 8 independent queues per port with strict priority and weighted round-robin scheduling.
• Marking and Shaping: DSCP (Differentiated Services Code Point) rewriting, ECN (Explicit Congestion Notification) support, and egress traffic shaping per queue.
• Flow Control: PFC (Priority Flow Control, IEEE 802.1Qbb) and DCBX (DCB eXchange, IEEE 802.1Qaz) for lossless Ethernet in storage and high-performance cluster networks.
• Hierarchical QoS: H-QoS for policy-driven per-subscriber or per-service-chain quality management.

Physical Specifications

• Chassis: 1U form factor, 19-inch rack mount.
• CPU: Eight-core x86 processor (A variant).
• System Memory: 64 GB DRAM (K variant).
• Storage: 120 GB SSD (K variant).
• Power Consumption: Dependent on configuration and airflow direction; consult detailed power specifications in the technical documentation.
• Cooling: Front-to-rear and rear-to-front airflow options.

System Scaling and Capacity

• MAC Address Table: Up to 384,000 entries
• IPv4 Routes: Over 5 million (FlexRoute, K variant)
• IPv6 Routes: FlexRoute 5M+
• Algorithmic ACLs: 100,000+
• ECMP Paths: 512-way

Operating System

End-of-Life and Support

Similar Arista Models to Consider

• DCS-7280SR3-40YC6-F: 40 × 25G SFP and 6 × 100G QSFP configuration with 800 Gbps throughput and 2 GB buffer; suited for smaller access-layer deployments.
• DCS-7280SRA-48C6-F: First-generation 7280R with 48 × SFP+ and 6 × QSFP28 ports; features AlgoMatch for policy-based forwarding and packet manipulation at wire speed.
• DCS-7280CR3K-32P4-F: High-density 100G/400G spine platform with 32 × QSFP28 and 4 × OSFP ports; optimized for core and multi-layer leaf-spine fabric designs.

Related 7280R3 Series Resources

Summary

Arista DCS-7280SR3K-48YC8A-F Technical Specifications

General Specifications

• Model Number: DCS-7280SR3K-48YC8A-F
• Switch Type: Layer 2/3 fixed-configuration switch
• Form Factor: 1RU
• Chassis Dimensions: 1.75” (H) × 17.4” (W) × 20.7” (D)
• Weight: Approximately 22–26 lbs (10–12 kg), depending on PSU and fan configuration
• System Memory (RAM): Enhanced control-plane memory (platform-class SR3K configuration)
• Flash Storage: Platform-class flash storage for EOS and system logs
• CPU: x86-based control-plane processor (SR3K platform)
• Field Replaceable Units (FRUs): Hot-swappable power supplies and fan modules
• ECC Memory Support: Yes – control-plane memory is ECC-protected
• Fans: N+1 redundant hot-swappable fans

Port Configuration

• SFP28 Ports: 48 × 1G / 10G / 25G SFP28
• QSFP28 Ports: 8 × 40G / 100G QSFP28
• Breakout Support: QSFP28 ports support breakout to 4 × 10G or 4 × 25G
• Maximum Total Ports: Up to 80 logical ports using breakout configurations
• Optics Compatibility: Compatible with Arista-qualified and industry-standard transceivers and DACs
• Digital Optical Monitoring (DOM): Supported on all optical interfaces

Throughput and Performance

• Switching Capacity: 6.4 Tbps
• Forwarding Rate: Up to ~2.4 billion packets per second (Bpps)
• Latency: Sub-microsecond latency, depending on configuration and packet size
• Buffer Memory: Large dynamic packet buffer (platform-class)
• MAC Address Table Size: Up to ~288K entries
• Routing Table Size: Large-scale IPv4 and IPv6 routing tables (SR3K class)

MTU Support

• Maximum MTU: 9,216 bytes
• Default MTU: 1,518 bytes

Environmental and Power

• Power Supply Options: Dual redundant hot-swappable AC or DC power supplies
• AC Input Voltage Range: 100–240V AC
• DC Input Voltage Range: –40V to –72V DC
• Typical Power Consumption: Platform-dependent, varies by optics and configuration
• Airflow: Front-to-rear (F) airflow
• 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

Software Compatibility

• Operating System: Arista EOS
• Licensing: EOS feature licensing (Base, Advanced L3, Premier)
• Zero Touch Provisioning (ZTP): Supported
• Smart System Upgrade (SSU): Supported
• Automation Interfaces: CLI, eAPI, REST APIs, Ansible, Python
• CloudVision: Fully supported

Lossless Features and Telemetry

• Streaming Telemetry: High-resolution real-time telemetry
• Buffer Monitoring: Dynamic buffer utilization monitoring
• sFlow: Supported
• QoS: Per-port and per-queue QoS with shaping and marking
• PTP: IEEE 1588v2 supported
• LLDP: Supported

Network and Overlay Technologies

• VXLAN: Supported with hardware acceleration
• EVPN: Supported
• MLAG: Supported
• ECMP: High-scale ECMP routing
• MPLS: Supported with appropriate EOS licensing
• IPv4 / IPv6: Dual-stack support
• Multicast: IGMP and PIM supported

Security Features

• MACsec: IEEE 802.1AE supported on compatible interfaces
• ACLs: Ingress and egress ACL support
• RBAC: Role-based access control via EOS
• Control Plane Protection: CoPP supported
• Secure Boot: Supported
• Management Security: SSHv2, SNMPv3, RADIUS, TACACS+

Reliability

• Redundancy: Dual hot-swappable PSUs and redundant fans
• High Availability: Designed for mission-critical data center deployments

• High Port Density: 48 ports of 25GbE SFP28 and 8 ports of 100GbE QSFP28.
• Advanced Layer 2/3 Support: Includes OSPF, BGP, and VXLAN.
• Network Virtualization: Facilitates efficient network segmentation and management.
• High Switching Capacity: Ensures seamless and efficient data transfer.
• Modular Design: Hot-swappable power supplies and fans for uninterrupted operation.

• 1-Year BrightStar warranty for end user customers
• 90-Day BrightStar Warranty for resellers

• Free FedEx Ground shipping within the United States
• FedEx Overnight shipping available as well
• FedEx International Shipping available for customers outside of the United States