Generative AI workloads are fundamentally reshaping data-center Ethernet switching architecture, driving demand for higher radix and all-to-all fabric designs.
The GenAI boom is driving record growth in the Ethernet switch and router markets. In Q2 2026, the latest quarter with compiled IDC data, switch revenues rose 43.4 percent to $18.91 billion, representing 23.1 percent sequential growth from Q1. The router market, under pressure for over a decade as routing functions migrate to Ethernet switch ASICs, still grew 22.8 percent to $4.51 billion, up 20.1 percent sequentially—driven by service providers, telcos, and cloud operators that cannot build custom routing software, unlike hyperscalers. Router vendors including Cisco Systems, Juniper Networks, Huawei Technology, Nokia, and Ericsson remain important for enterprise connectivity between datacenters and external networks.
Current Ethernet switch revenues reflect record levels, fueled not only by GenAI systems in datacenters but also by necessary upgrades to edge and campus networks feeding those systems. IDC's public dataset extends back only to Q3 2013, limiting long-term historical perspective, but the current trend mirrors the visible effects of the 2020-2022 pandemic period and now the GenAI wave.
Cisco's overall Ethernet revenues grew 36.2 percent to $5.43 billion in Q2 2026, but Nvidia led the growth surge, expanding 2.8X through its dominant GenAI systems business and high attachment rates for Spectrum-X switches scaling DGX server nodes and NVL72 rackscale systems. Nvidia's $3.86 billion in Ethernet switch revenues dwarfed rival Arista Networks, which grew 37.6 percent to $2.53 billion. Hewlett Packard Enterprise, bolstered by the Juniper Networks acquisition, saw its Ethernet business grow only 6.1 percent to $1.15 billion, though this was substantially wireless-focused under the Aruba brand. Huawei Technology edged out HPE with $1.55 billion in revenues, up 28.6 percent. Original design manufacturers collectively are estimated to have generated $3.56 billion in revenues, up 2.43X year-on-year, though IDC ceased publishing collective ODM figures.
Datacenter Ethernet switching comprises the core market segment. In Q2, datacenter Ethernet switch revenues totaled $12.3 billion, up 64.5 percent year-on-year and 23 percent sequentially, representing 65.1 percent of total Ethernet switch revenues. An estimated 129.5 million ports were sold into datacenter markets, predominantly for scale-out deployments, comprising 42.8 percent of all ports shipped despite generating 65 percent of revenue.
High-speed switch ports dominate datacenter deployments. Sales of 800 Gb/sec switches grew 6.1X year-on-year to $5.07 billion with a 41.5 percent sequential increase—exclusively datacenter-focused and showing explosive GenAI adoption. IDC data indicate 800 Gb/sec port share in datacenter deployments grew from 35.9 percent in Q1 2026 to 41.2 percent in Q2, with estimated shipments rising from 35.3 million to 54.3 million ports. Despite component shortages, cost per port is declining as hyperscalers negotiate aggressively, with vendors recouping revenue through volume. Switches with 200 Gb/sec or 400 Gb/sec ports, largely datacenter-exclusive, grew 71.6 percent to $6.35 billion, with an estimated 35.8 million ports sold. Port counts per machine continue rising as ASICs with 51.2 Tb/sec and 102.4 Tb/sec capabilities reach market, driving higher radix and bandwidth demands. 1.6 Tb/sec switches are approaching volume production for high-end GenAI systems, with emerging low-latency alternatives including UALink and ESUN protocols challenging Nvidia's NVLink/NVSwitch dominance.
In datacenter-specific competition, Nvidia nearly tripled Ethernet switch sales and substantially outpaced ODM growth. HPE achieved 2.1X growth but reached only $345 million—less than one-tenth of Nvidia's datacenter Ethernet revenue. Cisco expanded datacenter Ethernet sales 77.3 percent to $2.24 billion, excluding revenue from Silicon One ASIC sales to hyperscalers building proprietary switches through ODMs. Arista Networks remained marginally larger than Cisco with 37.9 percent growth to $2.3 billion.
The rapidly expanding server market, driven by GenAI and expensive GPU-laden nodes plus rackscale systems with integrated scale-up networks (not included in IDC Ethernet switch data), is only now beginning to lift the broader switch market meaningfully. A 2.8X ratio of server cores to high-speed switch ports in Q2 2026 suggests companies are systematically under-investing in networking relative to compute, a longstanding pattern often correlating with suboptimal server utilization.