Comparing Arista vs Cisco Networking Hardware

Last updated: September 2026. This guide was first published in 2019 and has been rewritten to reflect the current Arista and Cisco portfolios, operating systems, management platforms, optics, and licensing models, and to correct several statements in earlier versions that no longer apply.

Arista and Cisco are the two vendors most often shortlisted for data center switching, and increasingly for campus and routing as well. Both build reliable, standards-based hardware; the differences that matter in practice are the breadth of the portfolio, the operating system and automation model, the management platform, licensing and support, and how each vendor’s hardware holds value on the secondary market. This guide walks through each of those in turn.

Table of Contents

• Company Background
• Portfolio Breadth: Focused vs Comprehensive
• Operating Systems: EOS vs NX-OS, IOS XE, and IOS XR
• Management and Automation
• Data Center Switching: Arista 7000 Series vs Cisco Nexus 9000
• Routing Platforms
• Campus Switching
• Optics and Transceiver Compatibility
• Licensing, Support, and Lifecycle
• Arista vs Cisco on the Secondary Market
• Which Should You Choose?
• Arista and Cisco Hardware from BrightStar Systems

Company Background

Cisco Systems was founded in 1984 and is headquartered in San Jose, California. It is the largest networking vendor in the world by revenue, with a portfolio that spans switching, routing, wireless, security, collaboration, observability, and services, and the largest installed base and partner ecosystem in the industry.

Arista Networks was founded in 2004 and is headquartered in Santa Clara, California. Arista built its business on high-performance Ethernet switching for cloud providers, financial trading, and large enterprise data centers, and has since expanded into routing, campus switching and wireless, and network observability. Industry analysts generally rank Arista second to Cisco in data center Ethernet switching revenue. Arista’s customer base is concentrated in the largest cloud and enterprise operators, and its product line remains narrower and more focused than Cisco’s.

Portfolio Breadth: Focused vs Comprehensive

The most visible difference is scope. Cisco sells something for nearly every layer and location in a network: Catalyst switches and wireless for campus and branch, Nexus switches for the data center, Catalyst 8000 and ISR routers for the WAN edge, ASR 9000, NCS, and Cisco 8000 routers for service provider and core, Meraki for cloud-managed sites, plus firewalls, collaboration, and a large software and services business.

Arista’s portfolio is built around a single operating system running on a smaller set of platforms: the 7000 series data center and cloud switches and routers (7050X, 7060X, 7280R, 7300X, 7500R, and 7800R families, among others), the 720XP, 720D, and 750 campus switches, Arista wireless, and the CloudVision management platform. Arista does not sell firewalls, collaboration products, or a branch-office product line comparable to Cisco’s.

Which approach is better depends on the buyer. Organizations that want one vendor and one support contract across campus, WAN, data center, and security will find Cisco covers more ground. Organizations building or refreshing a data center fabric, where switching and routing are the whole requirement, often prefer Arista’s narrower, deeper focus.

Operating Systems: EOS vs NX-OS, IOS XE, and IOS XR

Arista runs one operating system, EOS, across its entire hardware line, and ships it as a single software image regardless of platform. EOS is built on an unmodified Linux kernel with a publish-subscribe state database (Sysdb) at its core, which lets individual processes be restarted or upgraded independently and gives operators direct access to Linux tools on the switch. The command-line interface is deliberately close to the industry-standard syntax most network engineers already know, so the learning curve from Cisco is short. Every EOS platform exposes eAPI, a JSON-RPC interface for automation, plus streaming telemetry and standard model-driven interfaces.

Cisco runs different operating systems on different product families. NX-OS runs on Nexus data center switches; IOS XE runs on Catalyst campus switches, Catalyst 8000 and ISR routers, and ASR 1000 routers; IOS XR runs on ASR 9000, NCS, and Cisco 8000 service provider and core routers. The three share a similar configuration style but differ in features, syntax details, upgrade procedures, and automation interfaces, and a team running Nexus in the data center, Catalyst on the campus, and ASR 9000 at the core is maintaining three operating systems. Cisco has invested heavily in programmability across all three (NX-API on Nexus, NETCONF/RESTCONF and YANG models on IOS XE and IOS XR, and model-driven telemetry), so the automation gap that once separated the two vendors has narrowed, but the single-image model remains an Arista differentiator for operators who value consistency.

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Management and Automation

Arista’s management platform is CloudVision, available as an on-premises appliance or as a service, which provides configuration management, change control, streaming telemetry, and network-wide visibility for EOS devices, and integrates with common automation tooling. Cisco’s data center management runs through Nexus Dashboard and, for organizations that adopt it, the ACI policy-based fabric model; campus management runs through Catalyst Center (formerly DNA Center) or the Meraki cloud dashboard. Cisco’s tools are more numerous and cover more product lines; Arista’s is a single platform for a single operating system. Both vendors support open standards such as OpenConfig, gNMI, and NETCONF, and both are commonly automated with Ansible, Terraform, and Python.

Data Center Switching: Arista 7000 Series vs Cisco Nexus 9000

This is where the two vendors compete most directly. Both build leaf, spine, and modular chassis switches from 10G access through 100G, 400G, and 800G, using merchant silicon from Broadcom (both vendors) and, in Cisco’s case, its own Cloud Scale and Silicon One ASICs on some platforms.

Arista organizes its data center line by silicon family and role. The 7050X family (Broadcom Trident) covers 10G, 25G, and 100G leaf switching with balanced feature sets; the 7060X family (Broadcom Tomahawk) covers high-radix 100G and 400G spine and leaf with very high throughput; the 7280R family (Broadcom Jericho) provides deep packet buffers, large routing tables, and rich routing features for leaf, spine, edge, and DCI roles; and the 7300X, 7500R, and 7800R families are modular chassis for spine and core. All run the same EOS image. Our guides to the 7050 vs 7060 vs 7280 series, the 7060 series, and the 7280R series cover the model-level detail.

Cisco‘s data center line is the Nexus 9000 series, which runs in either standalone NX-OS mode or ACI mode. The Nexus 9300 fixed switches span 1G/10G/25G access models through 100G and, in the GX and GX2 generations, 400G leaf and spine; the Nexus 9500 modular chassis serve as spine and core with 4, 8, and 16 line-card slots; and the Nexus 9200 line covered compact fixed models. Cisco also sells the Nexus 3000 series, closer in positioning to merchant-silicon switches, and the older Nexus 5000, 7000, and 7700 families remain widely deployed and available on the secondary market. See our Cisco Nexus 9000 comparison and Nexus 9000 inventory.

In practice the hardware capabilities are close at any given generation. The decisions that usually drive the choice are the fabric model (EVPN-VXLAN on either vendor versus Cisco ACI), the operating system and automation approach, existing staff skills, licensing cost, and the price of the hardware itself.

Routing Platforms

Earlier versions of this guide stated that Arista did not sell routing hardware. That has not been true for some years. Arista’s R-series platforms, the 7280R, 7500R, and 7800R families built on Broadcom Jericho silicon, carry full internet routing tables and deep buffers and are deployed as data center edge, peering, DCI, and cloud routers; Arista also offers CloudEOS as a virtual router for cloud and WAN use. What Arista does not offer is a branch-office or enterprise WAN router line comparable to Cisco’s.

Cisco’s routing portfolio is the broadest in the industry. The Catalyst 8000 series and the ISR line it replaces cover branch and WAN edge with SD-WAN; the ASR 1000 series covers enterprise and service provider edge; and the ASR 9000, NCS 5500, and Cisco 8000 series cover aggregation, core, and peering at service provider scale. Our ASR vs ISR guide and Cisco ASR inventory cover the Cisco side; for a comparison of Cisco routing with Juniper’s MX series, see Cisco vs Juniper routers.

Campus Switching

Cisco’s Catalyst 9000 family is the dominant enterprise campus platform, from the 9200 and 9300 access switches through the 9400 and 9600 modular chassis, and it is where most of Cisco’s installed base lives. Arista entered the campus market later with the 720XP and 720D access switches, the 750 modular chassis, and Arista wireless, all running the same EOS image and managed through CloudVision as the data center. Arista’s campus line is smaller and newer, but it appeals to organizations that already run EOS in the data center and want one operating system and one management platform end to end. See our Arista 720XP guide.

Optics and Transceiver Compatibility

Both vendors’ current switches and routers use the same industry-standard pluggable form factors: SFP and SFP+ for 1G and 10G, SFP28 for 25G, QSFP+ for 40G, QSFP28 for 100G, and QSFP-DD and OSFP for 400G and 800G. Optics are therefore physically interchangeable between the two vendors’ platforms at the same speed and reach.

The differences are in support policy. Cisco has historically used a proprietary 100G form factor called CPAK on certain ASR 9000, NCS, and Nexus 7700 line cards; CPAK optics work only in those Cisco slots and are not interchangeable with QSFP28. CPAK is a legacy form factor and does not appear on current-generation Cisco platforms. Beyond that, both vendors qualify and sell their own branded optics and provide full TAC support for them. Third-party and other-vendor optics are widely used on both Arista and Cisco hardware, but each vendor’s support for them is limited, and on some Cisco platforms a configuration command is required before an unqualified transceiver will be brought up. If you plan to reuse optics across vendors, confirm the policy for the specific platform and software release.

Licensing, Support, and Lifecycle

Cisco licenses most current platforms on a tiered subscription model: Essentials, Advantage, and Premier tiers on Nexus (NX-OS) and the Cisco networking subscription tiers on Catalyst, layered on top of the hardware price, with support sold separately through SMARTnet or Solution Support. Arista’s licensing is simpler: a small number of per-switch feature licenses on top of a base EOS image, with support sold as a per-device A-Care contract. Buyers comparing the two should compare total cost including licenses and support over the planned life of the equipment, not just hardware list price, because the licensing structures differ substantially.

Both vendors publish end-of-sale and end-of-support milestones. Cisco’s standard hardware policy provides support for five years after end of sale; Arista’s current policy also provides five years of support after end of sale, with software bug fixes for the first three. Our end of life vs end of service guide explains the milestones, and our Arista end of life list tracks dates by part number.

Arista vs Cisco on the Secondary Market

Cisco’s installed base means there is more used Cisco equipment available, more independent engineers who know it, and more third-party maintenance options; it also means individual Cisco platforms are plentiful and prices reflect that. Arista’s platforms are newer to the secondary market and tend to hold value well, particularly the 7050X, 7060X, and 7280R families that cloud and enterprise operators standardized on, because operators refreshing to the next generation want additional units and spares of the platform they already run.

For buyers, this makes refurbished Arista an economical way into a current-generation EOS fabric, and refurbished Cisco Nexus and Catalyst an economical way to extend or spare an existing Cisco environment. For sellers, both brands are readily marketable; see sell Arista equipment and sell Cisco equipment.

Which Should You Choose?

Arista tends to be the better fit when: the project is a data center fabric or cloud/edge routing; the team values one operating system, a Linux-based platform, and API-driven automation; licensing simplicity matters; or the organization already runs EOS and wants to extend it to campus.

Cisco tends to be the better fit when: the organization wants one vendor across campus, WAN, data center, and security; there is an existing Cisco installed base, skill set, or ACI deployment; branch and SD-WAN routing are part of the requirement; or the buyer needs the breadth of Cisco’s partner and support ecosystem.

In a pure data center switching comparison, both are strong choices and the decision is more often about operating model and cost than about hardware capability.

Arista and Cisco Hardware from BrightStar Systems

BrightStar Systems sells refurbished Arista and Cisco switches, routers, and optics, and as a Cisco Partner also offers new Cisco equipment. Refurbished units are available at up to 95% off manufacturer list price. Every refurbished unit we sell goes through our 9-Point Quality Control and Testing Process and ships with our 1-year in-house warranty for end users.

Arista series we carry include the 7010, 7020R, 7050, 7050X, 7060X, 7150, 7160, 7170, 7250X, 7260X, 7280, 7500, and 7800 series; see all used Arista products. On the Cisco side, see our Cisco switches and full Cisco inventory.

We keep prices down by buying in volume from enterprises, service providers, and data center liquidations. If you are selling, we provide a written offer within one business day, pay the freight, and pay by ACH or wire within five business days of testing completion; see how to sell used network equipment.

Contact us with the platforms, port counts, and speeds you are comparing and our sales team will quote current-generation and prior-generation options from both vendors.

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