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7800R3 Series

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7800R3 Series - Arista Networks



Arista 7800R3 Series Universal Spine and Cloud Networks

Designed for the next generation of large-scale virtualized and cloud networks the Arista 7800R3 Series modular switches are the 3rd generation of the R-Series universal spine switches. They combine 400G and 100G density with internet scale table sizes and comprehensive L2 and L3 features. Advanced EOS features for network monitoring, precision timing, VXLAN network virtualization, and EVPN are combined with extensive hardware resources with a wide choice of systems and line cards to support lasting investment protection.


7800R3 Series - Arista Networks 


The 7800R3 Series enables highly scalable network designs with Segment Routing, MLAG, ECMP, EVPN, and VXLAN technologies.


The Arista 7800R3 Series FlexRoute™ engine and EOS NetDB provide the scalability to support the Internet IP routing scale with the low power consumption and fast convergence while scaling to millions of routes.

Arista Algorithmic ACLs enables flexible high scale access controls with expanded pattern matching, combined with sFlow sampling of all interfaces at the full forwarding capacity while providing additional capabilities for filtering.



7800R3 Architecture Advantages:


  • Investment protection - backward and forward line card compatibility
  • Consistent 7800R3 Series architecture ensures seamless migrations
  • Distributed packet processor scales forwarding capacity linearly
  • FlexRoute™ for Internet route table scale with low power draw
  • Flexible pipeline for programmable features including Algorithmic ACLs and Inband Network Telemetry
  • System-wide health monitoring
  • High bandwidth intelligent and dynamic deep buffers for the most demanding traffic scenarios
  • Virtual Output Queues avoid head of line blocking
  • Cell-based fabric with redundancy for 100% efficiency and consistent low latency and jitter
  • Optimized multicast forwarding
  • Comprehensive counters with up to 16 classifications per flow for real-time monitoring and troubleshooting
  • QoS Fabric fairness - no hot-spots with fabric mirroring enhancements


High-Performance Universal Spine


  • Non-blocking 460Tbps of system capacity
  • High-density 10/25/40/50/100/400G Ethernet
  • 576 wire-speed 400G ports
  • Ultra-deep buffers up to 24GB per line card
  • Class-leading latency of 3.5usec
  • 14.4Tbps of fabric capacity per line card
  • Virtual Output Queues per port and CoS to eliminate the head of line blocking


Arista EOS


  • Single binary image
  • Fine-grained truly modular network OS
  • The scalable control plane for internet peering
  • Extensible platform - bash, python, C++, GO, OpenConfig
  • Resilient self-healing software
  • Rich Streaming Telemetry solutions
  • Over 10 Years of EOS innovations and experience with the R-Series Architecture


Scalable Cloud and Service Provider Designs


  • Comprehensive switching and routing feature set with rapid convergence
  • Segment Routing and EVPN Services for IX Providers and Cloud WAN
  • IPv4 and IPv6 Overlay and Underlay support
  • Internet-scale IPv4 and IPv6 forwarding tables up to 2.5M routes
  • Large scale IPv4 / IPv6, ACLs, and QoS with flexible profiles
  • Up to 48Bpps of wire-speed forwarding
  • CloudVision® provisioning and automation
  • VXLAN and 256-way multi-pathing for next-generation DC
  • LANZ for microburst detection
  • Accelerated sFlow for high capacity network security and application monitoring
  • Inband Network Telemetry for flow and packet forensics at scale
  • CloudVision for Workflow Automation and Orchestration



Arista 7800R3 Series Specifications

The Arista 7800R3 Series of modular switches deliver the industry’s highest performance with 460Tbps of system throughput to meet the needs of the largest scale data centers. With a choice of systems, the 7800R Series provides four or eight-line card modules, two supervisor modules, and six fabric modules. Designed for continuous operations and with system-wide monitoring of hardware and software components, simple serviceability, and provisioning to prevent single points of failure the hardware architecture supports high-availability with hot-swap of all components.


Arista 7500R3 Series Architecture

The Arista 7500R3 Series leverages a deep buffer virtual output queue (VOQ) architecture that is 100% efficient, eliminates head-of-line (HOL) blocking, and virtually eliminates packet drops even in the most congested network scenarios. An advanced traffic scheduler fairly allocates bandwidth between all virtual output queues while accurately following queue disciplines including weighted fair queuing, fixed priority, or hybrid schemes. As a result, the Arista 7800R3 Series can handle the most demanding data center requirements with ease, including mixed traffic loads of real-time, multicast, and storage traffic while still delivering low latency.


7800R3 System Comparisons:

Available in compact system design, as a choice of 12, 8, and 4 slots, the Arista 7800R3 Series enables a full range of wire-speed ports from 10G to 400G. It lowers the total cost of ownership as it is designed to be efficient with power per port as low as 25W per 400G port which combined with front to rear cooling to optimize the data center environment produces the most reliable, dense, and power-efficient modular switch.



Arista 7800R3 Series


System Performance


7808R3 Specifications


7804R3 Specifications

Description Delivers high density, low power non-blocking Ethernet switching system. Optimum form-factor for medium to large deployments.
Switching Capacity 230Tbps 115Tbps
Linecard Capacity 14.4Tbps 14.4Tbps
40G Interfaces 384 192
50G Interfaces 768 384
100G Interfaces 384 192
400G Interfaces 288 144
Forwarding Rate 48 Bpps 24 Bpps
Total Buffer 192GB 96GB
Rack Units 16 10
Airflow Front to Rear Front to Rear



7800R3 Line Cards Comparison:

The 7800R3 Series offer a broad choice of line cards with a choice of speed and density options up to 48 ports of wire-speed 100G and 40G, or 36 ports of 400G. Every 400G interface supports a choice of speeds including 25G and 50G providing unparalleled flexibility and the ability to seamlessly transition data centers to the next generation of Ethernet performance.


Ports 36 400G OSFP 48 100G QSFP 48 100G QSFP
Max 400G 36 -
Max 100G 144 48 48
Max 50G 288 96 96
Port Buffer 24GB 8GB 8GB
Switching Capacity 14.4Tbps 4.8Tbps 4.8Tbps
Forwarding Rate 6 Bpps 2 Bpps 2 Bpps
Algorithmic ACLs Yes Yes Yes
Accelerated sFlow Yes Yes Yes
Combined with the highly modular, robust Extensible Operating System (EOS), a dynamic smart deep buffer architecture with virtual output queuing for lossless forwarding, low latency, and wire-speed performance, the Arista 7800R3 line cards enable scalable and high-performance data center solutions.



Each 7800R3 Series line card delivers a consistent set of features supporting layer 2 and layer 3 data center designs with predictable and linear scaling. Arista's FlexRoute Engine enables full Internet routing coupled with support for a variety of IP/MPLS/VXLAN protocols.



7800R3 Series

7800R3K Series
ProfileBalanced L3 BalancedL3 L2 
MAC Addresses 448K 128K 736K 160K 1.4M
IPv4 Host Routes 896K 256K  1.4M  320K  2.8M 
IPv6 Unicast Host Routes 224K 64K 368K  80K  736K 
IPv4 Unicast LPM Routes 704K 1.3M 1.2M 2.5M 128K
IPv6 Unicast LPM Routes 235K 440K 411K 821K 42K
Multicast Routes 448K 128K 7368K  160K  1.4M 
ACL Entries 24K 24K  24K  24K  24K 
Maximum ECMP 256-Way 256-Way  256-Way  256-Way  256-Way



100G MACsec

Bulk data encryption at scale, high performance, and cost-effectively is a major challenge for cloud data centers. The Arista MACsec solution is integrated into a 7800R3 Series 48 port 100G line card offering high port density and secure performance at an efficient cost point.

The 7800R3 MACsec solution is fully compatible with all other 7800R3 Series line cards and utilizes proven encryption technology to protect traffic for simple and scalable data center interconnect. In addition to a choice of pluggable 100G optics, it can be used to secure links between tiers in leaf and spine data center designs. Standards-based IEEE 802.1AE (MAC Security standard, referred to as MACsec) capabilities provide line-rate frame encryption and authentication. This ensures confidentiality as well as providing anti-replay protection and therefore confidence in the integrity of encrypted traffic.



7800R3 48CQ LC - Arista Networks



Key Benefits:


  • High-density MACsec solution for Cloud Data Centers integrated with 7800R3 for highest density and performance in a modular platform
  • Cost and performance optimized for Data Center Interconnect (DCI) and Leaf-Spine connections to securely transport massive volumes of traffic
  • Secure transport of data over distance with MACsec encryption eliminating additional intermediate devices


Key Features:


  • 48 port 100G line card delivers full 9.6Tb of full-duplex bandwidth
  • Delivers up to 2 Billion packets per second of wire speed L2 and L3 IP forwarding
  • Internet-scale IPv4 and IPv6 forwarding tables
  • Compatible with all 100G and 400G line cards for 7800R3 Series
  • IEEE 802.1AE MACsec 100G encryption on all ports
  • Pluggable 100G QSFP optics for pay as you grow expansion
  • 8GB of deep buffer packet memory and Virtual Output Queue architecture to eliminate the head of line blocking and packet drops due to congestion 



Have more questions about Arista Networks Cloud Switching and Routing products and solutions? Call us at 410-583-1701 or email us at questions@pulsesupply.com.