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.

Featured Video: Introducing The Arista R3 Series

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

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

Arista Algorithmic ACLs enable 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.

7800R Architecture Advantages:

  • Investment protection - proven R Series with line card forward compatibility
  • Consistent 7800R3 Series architecture ensures seamless migration
  • 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 traffic counters with up to 16 classifications for real-time network monitoring and troubleshooting
  • QOS Fabric fairness - no hot-spots with mirroring enhancements

High Performance Universal Spine

  • Non-blocking 460Tbps of system capacity
  • High density 10/25/40/50/100/400G Ethernet
  • Scalable to 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 head of line blocking

Arista EOS

  • Single binary image
  • Fine-grained truly modular network OS
  • 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

Cloud Grade Routing

  • Comprehensive routing:OSPF/ OSPFv3, MP-BGP, IS-IS, PIM, MSDP and MLD
  • Transport Signaling : LDP, RSVP-TE, SR-TE, BGP-LU, BGP-LS
  • Services: IPv4 VPNs (RFC 4364), 6PE/6VPE, L2/L3 EVPN , EVPN-VPWS, EVPN-DCI*, EVPN-Multicast, VPLS*, Pseudowires
  • Tunneling: LDP, RSVP, SR, LDP over RSVP, GRE, MPLS over GRE
  • QoS: Classification, Flexible rewrite, Ingress Policing, VoQ, Hierarchical-QoS, Shaping
  • Security: MACSEC, uRPF, ACLs, CoPP, AAA

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 2.7M routes
  • Large scale IPv4 / IPv6, ACLs, and QoS with flexible profiles
  • Up to 96Bpps 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, eight or sixteen 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 7800R3 Series Architecture

The Arista 7800R3 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 a compact system design, as a choice of 16, 8 and 4 slots, the Arista 7800R3 Series enables a range of wirespeed ports from 10G to 400G. It lowers 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.

System Performance


7808R3 Specifications


7808R3 Specifications



7804R3 Specifications


Description Delivers the highest capacity, non-blocking Ethernet switching system. Delivers high density, low power non-blocking Ethernet switching system. Optimum form-factor for many medium to large deployments.
Switching Capacity 460Tbps 230Tbps 115Tbps
Linecard Capacity 14.4Tbps 14.4Tbps 14.4Tbps
40G Interfaces 768 384 192
50G Interfaces 1152 768 384
100G Interfaces 768 384 192
400G Interfaces 576 288 144
Forwarding Rate 96 Bpps 48 Bpps 24 Bpps
Total Buffer 384 GB 192GB 96GB
Rack Units 31 16 10
Airflow Front to Rear 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 36 400G QSFP-DD 48 100G QSFP 48 100G QSFP 72 25G SFP
Max 400G 36 36 - -
Max 100G 144 144 48 48 -
Max 50G 288 288 96 96 32
Max 25G 288 288 96 96 72
Port Buffer 24GB 24GB 8GB 8GB 4GB
Switching Capacity 14.4Tbps 14.4Tbps 4.8Tbps 4.8Tbps 2.6Tbps
Forwarding Rate 6 Bpps 6 Bpps 2 Bpps 2 Bpps 1 Bpps
Algorithmic ACLs Yes Yes  Yes Yes Yes
Accelerated sFlow Yes Yes  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.

Resources1 7800R3 Series 7800R3K Series
Profile L3 L3-XL L3-XXL
MAC Addresses 224K 256K 197K
IPv4 Host Routes 1.3M 2.1M 2.7M
IPv6 Unicast Host Routes 440K 700K 890K 
IPv4 Unicast LPM Routes 1.3M 2.1M 2.7M
IPv6 Unicast LPM Routes 440K 700K 890K
Multicast Routes 128K 128K 128K 
ACL Entries 24K 24K  24K 
Maximum ECMP 512-Way 512-Way 512-Way

1 Maximum values dependent on shared resources in some cases

400 and 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 to a 7800R3 Series 48 port 100G and 36 port 400G line cards 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 with a choice of pluggable 100G and 400G 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.


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:

  • 36 port 400G line card provides 14.4Tb of bandwidth
  • 48 port 100G line card delivers full 9.6Tb of full duplex bandwidth
  • Delivers up to 6 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 and 400G encryption on all ports
  • Flexible support for 4x100G and other link speeds with MACsec
  • Pluggable 100G QSFP and 400G QSFP-DD optics for pay as you grow expansion
  • Up to 24GB of deep buffer packet memory and Virtual Output Queue architecture to eliminate head of line blocking and packet drops due to congestion