Arista Networks7124FX Application Switch

Data Sheet - Overview

Product Highlights

Forwarding Performance
  • 24 1/10GbE ports in 1RU
  • 480 Gbps/360Mpps
  • Wire speed L2/3/4 forwarding
  • Sub-500 nanosecond latency
  • Low latency and jitter for all packets sizes and traffic types
  • Dynamic buffer allocation
Data Center Optimized Design
  • 1+1 redundant & hot-swappable power
  • N+1 redundant & hot-swappable fans
  • Front-to-rear or rear-to-front fans
  • Typical power consumption 6W/port
Robust CPU Subsystem
  • Dual-core x86 CPU
  • 4GB DRAM
  • 2GB Flash
  • Full Kernel VM Support
  • Precise clock option
Embedded Application Switch Subsystem
  • FPGA subsystem for custom embedded applications
  • Dedicated memory and PCIe connectivity
  • Natively integrated with EOS instrumentation and operations
  • Create your own, or install 3rd party apps
Built-in Solid State Storage
  • 50GB Solid State Drive
  • Store additional applications and virtual machines
  • Store logs and data captures
  • Leverage linux tools with no limitations
Advanced Provisioning & Monitoring
  • Zero Touch Provisioning (ZTP)
  • Latency Analyzer (LANZ)
  • VMTracer
  • sFlow
Arista Extensible Operating System
  • Single binary image for all products
  • Fine-grained truly modular network OS
  • Stateful Fault Containment (SFC)
  • Stateful Fault Repair (SFR)
  • Access to Linux tools
  • Extensible Platform


The Arista 7124FX Application Switch is a high performance, ultra-low latency embedded application switch. Based on the award winning Arista 7124SX, the 7124FX adds an inline programmable subsystem that is directly integrated with the forwarding plane. The 7124FX offers 24 1/10GbE wirespeed ports in a compact and power efficient 1RU chassis. The 16 standard front panel ports accommodate the full range of 10GbE SFP+ and GbE SFP options, allowing for maximum flexibility and deployment options. The 8 FX ports are directly connected to the user programmable subsystem, providing a flexible and open platform for custom and 3rd party embedded applications.

The integrated subsystem provides a unique capability to run latency sensitive and mission critical applications directly in the switch improving performance and determinism, while reducing overall latency and costs. A built in SSD is included for advanced logging, data captures and supporting embedded applications.

Arista 7124FX: 24-port Application Switch

Application Switch Programmability

The Application Switch subsystem includes an advanced FPGA with 160Gbps of wire speed performance and 6.2Million Gates. It’s purpose built for inline programmability and customized forwarding. Potential applications include data stream processing, integrated compute and networking functions for high performance applications, content based forwarding, IDS, and many others. Customers may choose to develop their own logic based on the Arista development kit, offering the ultimate in flexibility and customization. For customers that prefer off-the-shelf applications, Arista partners will provide system integration support and “appliance” images for the Application Switch subsystem.

Features Benefits
High Speed Sub microsecond delivery of application processing handled entirely within the inline FX solution reducing total latency
Deterministic Latency The proven ultra low latency solution provides deterministic latency even under load for processing critical traffic
Data Distribution 8 10GbE FX and 16 standard wirespeed interfaces allows for multiple sources and destinations per FX switch
Reduced Costs A single FX switch can run multiple applications concurrently. Integration with an ultra low latency switch lowers power and footprint compared to server solutions
Scalability 24 10GbE interfaces allows connectivity to multiple inputs and outputs. Cascading ultra low latency switches provides additional scalability.
Ease of Integration Scalability, performance and cost savings are realized through native integration with EOS and existing tools.


Arista Networks7124FX Application Switch

Data Sheet - Highlights

Deterministic, Ultra-Low Latency

The Arista 7124FX is optimized to deliver industry-leading ultra-low latency, cut-through forwarding at sub-500 nanoseconds for both unicast and multicast traffic, on the standard interfaces, for all packet sizes. The latency does not change even when additional features such as L3 forwarding, L4 inspection, ACL, QoS, Multicast or Port Mirroring functionality are enabled. The 7124FX also forwards packets in cut-through mode at 1GbE speeds at low latency for legacy connections.

7124fx Front viewArista 7124FX Front View: 16 Standard and 8 FX SFP+ Ports 7124fx Rear viewArista 7124FX Rear View: Front-to-rear airflow model 7124fx Rear viewArista 7124FX Rear View: Rear-to-front airflow model

High Availability

The Arista 7124FX switch was designed for high availability from both a software and hardware perspective. Key high availability features include:

  • 1+1 hot-swappable power supplies
  • Four N+1 hot-swappable fans
  • Live patching
  • Self healing software with Stateful Fault Repair (SFR)
  • Up to 16 10GbE ports per link aggregation group (LAG)
  • Multi-chassis LAG for active/active L2 multipathing
  • 16-way ECMP routing for load balancing and redundancy

Arista EOS

The Arista 7124FX switches run the same Arista EOS software as all Arista products, simplifying network administration. Arista EOS is a modular switch operating system with a unique state sharing architecture that cleanly separates switch state from protocol processing and application logic. Built on top of a standard Linux kernel, all EOS processes run in their own protected memory space and exchange state through an in-memory database. This multi-process state sharing architecture provides the foundation for in-service-software updates and self-healing resiliency.

With Arista EOS, advanced monitoring and automation capabilities such as Zero Touch Provisioning, VMTracer and other Linux based tools can be run natively on the switch, with the powerful dual-core x86 CPU subsystem.

Provisioning Tools and Built-in Storage

The 7124FX switches offer advanced capabilities for network provisioning. The integrated 50GB SSD provides storage for application and system logging that allows for a whole new family of applications that can be run from the network itself. This includes having the switch be a PXE boot server, store syslogs for audit and compliance right on the switch, logging latency trends per queue, capturing and saving data packets via tcpdump and running Linux based services such as DHCP and Precision Time Protocol (PTP).

Latency Analyzer (LANZ)

The 7124FX offers advanced capabilities for latency and application analysis. Congestion points can be identified and tracked over time with granular precision, allowing a network operator to peer “inside” a burst event. LANZ streaming provides an open standards based mechanism for streaming queue depth metrics off the switch to an external collecting station, providing a valuable data point for operational and application insight.

Precision Time Options

The Arista 7124FX provides industry leading time synchronization and precision clock features. The FX subsystem includes an external connector for direct external synchronization to PPS or IRIG time sources. Additionally an integrated high-accuracy clock is available on the CPU subsystem to provide an accurate pulse for CPU based applications and logging LANZ data. Both systems can work in conjunction to provide nanosecond levels of accuracy for the most sensitive and precise timing applications.


Arista Networks7124FX Application Switch

Data Sheet - Features

Layer 2 Features

  • 16K L2 Forwarding Entries
  • 802.1w Rapid Spanning Tree
  • 802.1s Multiple Spanning Tree Protocol
  • Rapid Per VLAN Spanning Tree (RPVST+)
  • 802.3ad Link Aggregation/LACP
    • 16 ports/channel / 256 groups per system
  • Multi-Chassis Link Aggregation (MLAG)
    • Uses IEEE 802.3ad LACP
    • 32 ports per MLAG
  • 802.1Q VLANs/Trunking
    • 4096 VLANs
  • Q-in-Q
  • 802.1AB Link Layer Discovery Protocol
  • Port Mirroring
  • 802.3x Flow Control
  • Jumbo Frames (9216 Bytes)
  • IGMP v1/v2/v3 snooping
  • Storm Control

Layer 3 Features

  • 16K IPv4 Routes, 4K IPv6 Routes*
  • Static Routes
  • OSPF and BGP
  • 16-way Equal Cost Multipath Routing (ECMP)
  • Route Maps
  • PIM-SM
  • Anycast RP (RFC 4610)
  • VRRP
  • Virtual ARP (VARP)

Embedded FX Subsystem

  • Altera Stratix V FPGA
    • 6.2M Gates
    • 50Mb onboard SRAM
    • 216Mb QDRII SRAM
  • PCIe Gen2 Interface to CPU
  • External JTAG connection via top panel
  • PPS Precision time input via MCX connector

Monitoring and Provisioning

  • Latency Analyzer (LANZ)
  • Zero Touch Provisioning (ZTP)
  • SSD for logging and data capture
  • Restore from USB
  • Blue Beacon LED for system identification

Security Features

  • L2, L3, L4 ACL's
  • Control Plane Protection (CPP)
  • MAC Security
  • TACACS+ / Radius / AAA
  • Private VLAN

VM Tracer Feature Set

  • VMware vSphere support
  • VM Auto Discovery
  • VM Adaptive Segmentation
  • VM Host View

Quality of Service (QoS) Features

  • Up to 8 queues per port
  • 802.1p based classification
  • Per-Priority Flow Control (PFC)
  • Data Center Bridging Extensions (DCBX)
  • DSCP based classification and remarking*
  • Egress queueing and shaping
  • Policers*
  • Rate limiting

Network Management

  • 10/100/1000 Management and Serial Console port
  • USB Port
  • SNMP v2, v3
  • Management over IPv6
  • Telnet and SSHv2
  • Syslog
  • Industry Standard CLI

Standards Compliance

  • 802.1D Bridging and Spanning Tree
  • 802.1p QOS/COS
  • 802.1Q VLAN Tagging
  • 802.1w Rapid Spanning Tree
  • 802.1s Multiple Spanning Tree Protocol
  • 802.1AB Link Layer Discovery Protocol
  • 802.3ad Link Aggregation with LACP
  • 802.3ab 1000BASE-T
  • 802.3z Gigabit Ethernet
  • 802.3ae 10 Gigabit Ethernet


  • RFC 3635 EtherLike-MIB
  • RFC 3418 SNMPv2-MIB
  • RFC 2863 IF-MIB
  • RFC 2013 UDP-MIB
  • RFC 2012 TCP-MIB
  • RFC 2011 IP-MIB

* Supported in a future software release

Technical Specifications

Arista Networks7124FX Application Switch

Data Sheet - Technical Specifications

Table Sizes

MAC Addresses 16,000
STP Instances 64 (MST)/4,000 (PVST)
IGMP Groups 3,000
ACLs 2,000
IPv4 Hosts 16,000
IPv4 Routes - Unicast 16,000
IPv4 Routes – Multicast 4,500
IPv6 Routes – Unicast 4,000
IPv6 Routes – Multicast 1,125
ECMP 16-way

Environmental Characteristics

Operating Temperature 0 to 40C
Storage Temperature -40C to 70C
Relative Humidity 5 to 95%
Operating Altitude 0 to 10,000 ft

Power Specifications

Input Voltage 100-240AC
Input Current (Max) 2.2-5.3A
Input Frequency 50-60Hz
Input Connector IEC 320-C13

Standards Compliance

EMI FCC Part 15 Class A
ICES-003 Class A
VCCI Class A
Safety IEC/UL/CSA/EN 60950
CE, UL, TUV Mark
Other ROHS-6 Compliant

Physical Characteristics

Size (WxHxD) 19” x 1.75” x 16”
(44.5 x 4.4 x 40.64 cm)
Weight 18 lbs (8.16 kg)


Ports 24 10GbE : (16 Standard / 8 FX)
Interface Type SFP/SFP+
Throughput 480 Gigabits per second
Packets/Second 360 Million pps
Latency 500 nanoseconds
CPU Dual-Core x86
System Memory 4 Gigabytes
Flash Storage Memory 2 Gigabytes
SSD Storage 50 Gigabytes
10/100/1000 Mgmt Port 1
Serial Console Port  1 (RJ-45, RS-232)
USB Ports 1
Hot-swappable Power Supplies 2 (1+1 redundant)
Hot-swappable Fans 4 (N+1 redundant)
Reversible Airflow Yes
Typical Power Draw 150W*
Maximum Power Draw 210W

Supported Optics and Cables

Interface Type Standard Ports FX Ports
10GBASE-CR 0.5m to 7m -
10GBASE-SRL 50 μm MMF 100m 50 μm MMF 100m
10GBASE-SR 50 μm MMF 300m 50 μm MMF 300m
10GBASE-LRM 62.5 μm MMF 220m -
10GBASE-LR 9 μm SMF 10km 9 μm SMF 10km
10GBASE-ER 9 μm SMF 40km 9 μm SMF 40km
10G-DWDM 9 μm SMF 40km 9 μm SMF 40km
1000BASE-SX 50 μm MMF 550m 50 μm MMF 550m
1000BASE-LX 9 μm SMF 10km 9 μm SMF 10km
100/1000BASE-T Category 5 Copper 100m Category 5 Copper 100m

* Typical power consumption measured at 25C ambient with 50% load

Ordering Information

Arista Networks7124FX Application Switch

Data Sheet - Ordering Information

Product Number Product Description
DCS-7124FX-F Arista 7124FX 24-port 10GbE switch (SFP+), FPGA and SSD, front-to-rear air, 2xAC, 2xC13-C14 cords
DCS-7124FX-R Arista 7124FX 24-port 10GbE switch (SFP+), FPGA and SSD, rear-to-front air, 2xAC, 2xC13-C14 cords
DCS-7124FX-CL-F Arista 7124FX 24-port 10GbE switch (SFP+), FPGA, SSD, precision clock, front-to-rear air, 2xAC, 2xC13-C14 cords
DCS-7124FX-CL-R Arista 7124FX 24-port 10GbE switch (SFP+), FPGA, SSD, precision clock, rear-to-front air, 2xAC, 2xC13-C14 cords
FAN-7000-F Spare fan module for Arista 7124FX (front-to-rear airflow)
FAN-7000-R Spare fan for Arista 7124FX (rear-to-front airflow)
PWR-460AC-F Spare 460W AC Power supply for Arista 7124FX switches (front-to-rear airflow)
PWR-460AC-R Spare 460W AC Power supply for Arista 7124FX switches (rear-to-front airflow)
PWR-460DC-F Spare 460W DC power supply for Arista 7124FX switches (front-to-rear airflow)
PWR-460DC-R Spare 460W DC power supply for Arista 7124FX switches (rear-to-front airflow)
LIC-VM-TRACER-1 VM Tracer License for 7048, 7120 and 7124 Switches
LIC-7124-E Enhanced License for Arista 7100 24-port Switches (OSPF, BGP, PIM)
LIC-7124-Z Network monitoring and provisioning feature set license for Arista 7100 24-port switches (ZTP, LANZ)
KIT-7000 Spare accessory kit for Arista 7124FX switches
DCS-7124FX-DEV1 Application Switch development and programming software, programming cable, 15hrs support


The Arista 7124FX switch comes with a one-year limited hardware warranty, which covers parts, repair, or replacement with a 10 business day turn-around after the unit is received.

Service and Support

Support services including next business day and 4-hour advance hardware replacement are available. For service depot locations, please see: http://www.aristanetworks.com/en/service


5470 Great America Parkway
Santa Clara, California 95054


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