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Data Center Networking Companies

Who connects data centers: switching and fabric vendors, network silicon and AI interconnect makers, optics and cabling suppliers, network software, and the standards bodies behind Ethernet and AI fabrics. Grouped by role, not ranked. Links go to each company's site.

30 companies•5 categories•Updated November 2026

Data Center Switching & Fabric Vendors

10 entries

Makers of the Ethernet and InfiniBand switches, routers and fabrics that connect servers, storage and GPUs inside and between data centers.

01NVIDIA NetworkingNetworking for AI workloads, with a focus on ultra-low latency and high efficiency for model training and inference, per its site. 02Arista NetworksData center and cloud networking vendor known for Ethernet switching. 03CiscoData center networking portfolio covering switching, fabrics and automation. 04HPE Networking (Juniper)HPE closed its roughly $14 billion acquisition of Juniper Networks in early July 2025, and Juniper's website now redirects to HPE. 05Dell TechnologiesData center networking switches and software sold alongside Dell servers and storage. 06NokiaData center networking solutions for AI and traditional application workloads, per its site. 07Extreme NetworksCloud networking vendor with data center switching products. 08CelesticaDesign and manufacturing company that builds networking hardware for data centers. 09Edgecore NetworksDevelops hardware and software platforms for open networking, per its site. 10SupermicroServer maker that also sells data center networking switches.

Network Silicon & AI Interconnect

5 entries

Switch chips, retimers, SerDes and interconnect fabrics used inside AI clusters.

11BroadcomEthernet switching silicon and software for data center, enterprise and service-provider networks, per its site. 12MarvellSemiconductor company with data center networking and electro-optics products. 13Astera LabsConnectivity chips and modules for AI and cloud infrastructure. 14CredoHigh-speed connectivity chips and active electrical cables for data centers. 15Cornelis NetworksDescribes itself as the only open fabric architecture that spans scale-up and scale-out, per its site.

Optics, Cabling & Data Center Interconnect

7 entries

Transceivers, lasers, fiber and cabling, and the optical gear that links data centers to each other.

16CoherentPhotonics and optical-networking maker with data center transceivers. 17LumentumOptical and photonic technologies for cloud networking, per its site. 18CorningOptical fiber and connectivity for data centers. 19CommScopeStructured cabling and connectivity infrastructure for data centers. 20AmphenolConnectors, cables and interconnect products used in servers and switches. 21FabrinetPrecision optical, electro-mechanical and electronic manufacturing for networking customers. 22CienaOptical networking systems for data center interconnect.

Network Software, Automation & Observability

4 entries

Open network operating systems, source-of-truth tools and traffic analytics for data center networks.

23SONiCOpen-source network operating system for switches, widely used in cloud data centers. 24NetBox LabsEnterprise version of the NetBox network source of truth, per its site. 25KentikNetwork intelligence platform for observability, performance and security, per its site. 26Aviz NetworksNetwork solutions, infrastructure services and consulting, including open networking.

Standards & Industry Bodies

4 entries

Where the specifications for Ethernet, AI fabrics and open hardware are developed.

27Ultra Ethernet ConsortiumWorking on an open, Ethernet-based full-stack architecture for AI and HPC at scale, per its site. 28UALink ConsortiumIndustry group for an open accelerator interconnect. 29IEEE 802.3 Ethernet Working GroupThe IEEE working group that maintains the Ethernet standard. 30Open Compute ProjectOpen hardware community with a networking project.

Related Pages

8 entries

Related directories on this site.

31Top Data Center Power CompaniesPower infrastructure, generation and utilities behind data centers. 32Data Center Networking CompaniesCooling switching, silicon, optics and software. 33Colocation Service ProvidersOperators that rent space, power and connectivity. 34Network Operating SystemsOperating systems for switches and routers. 35Cloud Networking VendorsVendors of cloud and virtual networking. 36IT Infrastructure Hardware CompaniesServers, storage and networking hardware vendors. 37AI Chip ProvidersAccelerator makers whose clusters drive network demand. 38Data Center Storage CompaniesStorage arrays, AI data platforms, object storage and drive makers.

Frequently Asked Questions

Why does networking matter more for AI data centers?

AI training links thousands of GPUs that must exchange data constantly, so the network can limit how fast a cluster works. Operators therefore add a high-speed back-end fabric, built on Ethernet or InfiniBand, alongside the front-end network that connects users, storage and the internet.

What kinds of companies are listed?

Five groups: switching and fabric vendors (NVIDIA, Arista, Cisco, HPE Networking, Nokia), network silicon and AI interconnect makers (Broadcom, Marvell, Astera Labs, Credo), optics, cabling and interconnect suppliers (Coherent, Lumentum, Corning, Ciena), network software and observability tools (SONiC, NetBox Labs, Kentik), and standards bodies.

What is the difference between Ethernet and InfiniBand for AI clusters?

InfiniBand is a high-performance fabric with a long history in supercomputing, and NVIDIA supplies it. Ethernet is the dominant data center standard, and the Ultra Ethernet Consortium is defining an open Ethernet-based architecture for AI and HPC. Vendor sites present both as options, so test with your own workloads.

What happened to Juniper Networks?

HPE closed its roughly $14 billion acquisition of Juniper Networks in early July 2025, and Juniper's website now redirects to HPE, where the networking business operates as HPE Networking.

What is SONiC?

SONiC is an open-source network operating system that runs on switches from several hardware vendors. It is linked in the software group and is maintained as an open project.

Does this page cover power, cooling and colocation?

No. See Top Data Center Power Companies, Data Center Networking Companies and Colocation Service Providers on this site.

How current is this page?

Links were checked on 4 November 2026. Arista returned 406, and Cisco, Dell, Supermicro, Astera Labs, Marvell, Credo, Corning, Amphenol, Ciena and the Open Compute Project returned 403 to automated checks, which looks like bot blocking. The HPE home page did not respond, so those links may need a manual click. Descriptions follow each company's own pages and are not independent rankings or benchmarks.