Arista 7800R4 Series

Arista 7800R4 Series Universal Spine

Designed for the next generation of accelerated computing, large scale virtualized and cloud networks, and service provider backbones, the Arista 7800R4 Series modular switches are the 4th generation of the R-Series universal spine platform. The 7800R4 series combines high density 800G and 400G density with comprehensive functionality for large scale networking as well as dedicated hardware choices for accelerating AI/ML workloads to maximize performance.

Advanced Extensible Operating System (EOS™) features include network monitoring, real-time telemetry, precision timing and EVPN-VXLAN network virtualization. Arista Etherlink® features include a suite of optimized load balancing and congestion control for RDMA workloads including DCQCN, PFC and ECN and are forwards compatible with Ultra Ethernet, optimizing performance for current and future AI/ML workloads. Together with extensive hardware resources and a wide choice of systems, the 7800 Series provides lasting investment protection.

Arista AI Etherlink Portfolio

The 7800R4 Series enables highly scalable and secure network designs with MPLS, Segment Routing, MLAG, ECMP, and EVPN-VXLAN technologies in addition to Arista’s TunnelSec strong encryption for layer 2 and layer 3.

7800R4 Series line cards build on the capability of the 7280R and 7500R Series with support for FlexRoute, Accelerated sFlow and large scale ACLs. FlexRoute provides scalability to support deployment as a routing platform with Internet scale routing. Algorithmic ACLs provide flexible pattern matching for access control, policy based forwarding and network telemetry. 7800R4M Series line cards add wire-speed TunnelSec encryption capability while 7800R4K Series offer both encryption and expanded FlexRoute support to over 5M routes. Accelerated sFlow at high density 100G, 400G and 800G provides visibility and programmatic control of traffic steering with no impact on packet forwarding. ^*
(* availability 1H 2025)

7800R4C line cards are optimized for cluster computing, implementing a simplified, lower latency and energy conserving pipeline while maintaining the core non-blocking, lossless forwarding architecture that enables intensive applications to perform to their maximum.

7800R Architecture Advantages:

Consistent 7800R4 Series architecture ensures seamless migration and investment protection
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

Arista EOS

Single 64 bit 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 15 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 with over 5M IPv4 routes
Large scale IPv4 / IPv6, ACLs, and QoS with flexible profiles
Up to 173Bpps of wire speed forwarding
CloudVision® provisioning and automation
VXLAN and 512-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

High Performance Universal Spine

Non-blocking 460Tbps (920Tbps FDX) of system capacity
High density 25/50/100/400G/800G Ethernet
Wirespeed TunnelSec encryption at 25G-800G

MACsec, IPSsec and VXLANsec

Scalable to 576 wire speed 800G ports
Ultra deep buffers up to 32GB per line card
Class leading latency of 3.5usec
28.8Tbps of fabric capacity per line card
Virtual Output Queues per port and CoS to eliminate head of line blocking

Arista Etherlink for AI

AI Analyzer powered by AVA
Advanced RDMA load balancing
Optimized DCQCN, ECN, PFC congestion management
AI workflow integration
Designed for future UEC deployments

Cloud Grade Routing

Comprehensive routing: OSPF/ OSPFv3, MP-BGP, IS-IS, PIM, MSDP and MLD
Transport Signaling : LDP, RSVP-TE, SR/ SR-TE, BGP-LU, BGP-LS
Services: IPv4 VPNs (RFC 4364), 6PE/6VPE, L2/L3 EVPN , EVPN-VPWS, EVPN (MPLS), EVPN-MPLS Gateway, EVPN-DCI, EVPN-Multicast, VPLS, mLDP, Pseudowires, PTP, E-OAM
Tunneling: LDP, RSVP, SR, LDP over RSVP, GRE, MPLS over GRE
Resiliency: ECMP/ UCMP, PIC, RSVP-TE FRR, SRLG, TI-LFA
QoS: Classification, Flexible rewrite, Ingress Policing, VoQ, Hierarchical-QoS, Shaping
Support for 400G-ZR, 800G-ZR and the Arista ZR line system for metro DWDM
Security: MACsec, IPSec, uRPF, ACLs, CoPP, AAA, Dot1X

Arista 7800R4 Series Specifications

The Arista 7800R4 Series of modular switches deliver the industry’s highest performance with 460Tbps (920Tbps FDX) of system throughput to meet the needs of the largest scale accelerated compute clusters, data centers and provider backbones. With a choice of systems the 7800R4 Series provides four, eight, twelve or sixteen line card modules with redundant fabric and supervisor modules, and a range of grid redundant power supplies for AC, -48V DC and HVDC infrastructure.

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 7800R4 Series Architecture

The Arista 7800R4 Series are purpose built multi-chip systems with fully distributed end to end scheduling and coordination - even in the largest 16-slot, 576x 800GbE variant, the platform operates like a single extremely large switching chip that is 100% internally lossless and fair. Four advanced technologies converge to this highly desirable architecture:

Cell-based fabric - mitigates elephant and mice flows with uniform cells sprayed across all fabric links for 100% efficiency
Virtual Output Queues (VOQ) - invokes ingress virtual queues to every egress port, eliminating head of line blocking (HOLB)
Distributed Credit Scheduling - ensures all egress ports are independent eliminating HOLB and noisy neighbor issues
Deep Buffering - easily handles incast, bursts and speed mismatches without packet loss, keeping TCP running efficiently

This advanced architecture enables the Arista 7800R4 to handle the most demanding workloads with ease. Accelerated compute clusters, data centers and Service Provider networks all benefit from the 7800R family’s ability to handle high bandwidth low entropy traffic, mixed traffic loads, real-time, multicast, and storage traffic while still delivering low latency and non-blocking performance.

7800R4 System Comparisons

The 7800R4 Series offers extremely high density at four levels of capacity, with 16, 12, 8 and 4 slot chassis options available. Supporting a broad range of wirespeed interfaces from 25G to 800G, the 7800R4 series lowers total cost of ownership through efficient design principles. With power consumption as low as 5W per 100Gbps, discrete cooling zones and advanced environmental monitoring to optimize power consumption, the 7800R4 Series delivers maximum reliability, density, and power efficiency.

The 7800R4 Series offers choice of line cards with 36 x 800G interfaces, supporting wire speed breakout to 25G, 50G, 100G, 200G and 400G including support for ZR and ZR+ coherent DWDM transceivers, providing unparalleled flexibility and the ability to seamlessly transition data centers, accelerated compute clusters and provider backbones to the next generation of Ethernet performance.

System Performance
	7816LR4	7812R4	7808R4	7804R4
Description	Delivers the highest capacity, non-blocking Ethernet switching system.	Scalable non-blocking capacity for large scale deployments	Delivers high density, low power non-blocking Ethernet switching system.	Optimum form-factor for many medium to large deployments.
Switching Capacity	460 Tbps (920 Tbps FDX)	345 Tbps (690 Tbps FDX)	230 Tbps (460 Tbps FDX)	115 Tbps (230 Tbps FDX)
Linecard Capacity	28.8 Tbps	28.8 Tbps	28.8 Tbps	28.8 Tbps
800G Interfaces	576	432	288	144
400G Interfaces	1152	864	576	288
Forwarding Rate	173 Bpps	130 Bpps	86 Bpps	43 Bpps
Total Buffer	512 GB	384 GB	256 GB	128 GB
Rack Units	32	23	16	10
Airflow	Front to Rear	Front to Rear	Front to Rear	Front to Rear

7800R4 800G Linecards:

	7800R4C-36PE
Ports	36 800G OSFP
Max 800G	36
Max 400G	72
Max 100G	288
Port Buffer	32 GB
Switching Capacity	28.8 Tbps
Forwarding Rate	10.8 Bpps
Cluster Computing Optimized	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 7800R4 line cards enable high performance, high scalable solutions for accelerated computing clusters.

Datasheet

.7800R4 AI Spine Datasheet