--- title: "OcNOS on Tomahawk 6: a 102.4T white box promises lossless RoCE. Who proves it?" description: "IP Infusion plans OcNOS-DC on Broadcom Tomahawk 6: 102.4 Tbps, 64x1.6TbE, PFC and ECN for RoCE. No GA date, no numbers. What to test before buying." image: https://test4net.com/hubfs/blog-covers/ocnos-tomahawk-6-whitebox-lossless-test-checklist.png --- [Skip to content](https://test4net.com/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist#main-content) [![TEST4NET](https://test4net.com/hubfs/test4net-logo-fixed-2.svg)](https://test4net.com/?hsLang=en) - Services - Products - Resources - Company - [English](https://test4net.com/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) - [Русский](https://test4net.com/ru/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) - [Հայերեն](https://test4net.com/hy/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) - [English](https://test4net.com/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) - [Русский](https://test4net.com/ru/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) - [Հայերեն](https://test4net.com/hy/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) What we test By technology Industries [Load & Performance Testing Throughput, sessions and latency up to and past the rated limit](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing Features against the spec, RFC compliance with evidence](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing Multi-vendor behaviour, before it reaches production](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing NGFW, IPS and VPN efficacy and performance with threats on the wire](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design What to test, how, and what counts as a pass](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD Regression suites wired into your release pipeline](https://test4net.com/services/test-automation?hsLang=en) [Training Programs Hands-on courses for your test engineers](https://test4net.com/services/training-programs?hsLang=en) [Equipment Repair Repair and verification of test equipment](https://test4net.com/services/equipment-repair?hsLang=en) [All services](https://test4net.com/services?hsLang=en) [Routing & Switching RFC 2544 and RFC 2889 on real ports, 1G to 100G](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW RFC 9411 throughput with inspection switched on](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [SD-WAN & WAN Path selection and QoS under emulated WAN conditions](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV Virtual appliances and cloud services under load](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core Transport and core functions under subscriber traffic](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi Wi-Fi 6 clients and access points, Wi-Fi 7 in progress](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure Storage networks and servers under realistic I/O](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2) Lossless Ethernet for GPU clusters: PFC, ECN, fabric load](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) [Telecom Operators Pre-deployment acceptance and vendor comparison](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors Independent validation of your product claims](https://test4net.com/solutions/industries#vendors) [System Integrators Proof for the customer before the rollout](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks Upgrades and new platforms checked before production](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) Not sure where to start? 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Who proves it? ![](https://test4net.com/hubfs/IMG_0070.jpg) [Alexander Zemskov](https://test4net.com/blog/author/az) October 29, 2026 5 min read [English](https://test4net.com/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) [Русский](https://test4net.com/ru/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) [Հայերեն](https://test4net.com/hy/blog/ocnos-tomahawk-6-whitebox-lossless-test-checklist) ![OcNOS on Tomahawk 6: a 102.4T white box promises lossless RoCE. Who proves it?](https://test4net.com/hs-fs/hubfs/blog-covers/ocnos-tomahawk-6-whitebox-lossless-test-checklist.png?width=1600&height=900&name=ocnos-tomahawk-6-whitebox-lossless-test-checklist.png) In this article On October 14, 2026, IP Infusion announced plans to bring its OcNOS-DC network OS to switches built on Broadcom Tomahawk 6: 102.4 Tbps on one chip, 512 ports of 200G or up to 64 ports of 1.6TbE depending on the platform. The release promises PFC and ECN for RoCE traffic and lossless operation at full line rate. There is no GA date, no list of qualified hardware, no latency or TCO numbers. A preview was shown at NANOG 98 in Miami on October 19–21. For an AI cluster this is good news: a white box with an open OS costs less than a branded switch. The catch is the word "lossless". In the release it is a promise. On your testbed it becomes a measurement, and that measurement is on you. ## What was announced - OcNOS-DC on Tomahawk 6 is planned for the OcNOS 7.2 release, with no date. Supported platforms will be named with the release. Today OcNOS-DC ships on Tomahawk 5 at 800G and Tomahawk 4 at 400G. - **Tomahawk 6:** a 3 nm chip with 64 native ports. Since March 12, 2026, Broadcom has 2 variants for pluggable optics in volume production: BCM78910 with 1,024 lanes of 100G PAM4 and BCM78914 with 512 lanes of 200G PAM4. - **Scale from the release:** up to 512 accelerators in one hop, up to 128,000 XPUs in a two-tier leaf-spine without a super-spine. This is Broadcom's radix arithmetic, with no test results behind it. - **Congestion management in OcNOS-DC today:** PFC, ECN, PFC deadlock detection and recovery, dynamic load balancing, streaming telemetry. Packet trimming, latency-based ECN, link-level retry and credit-based flow scheduling are listed as roadmap. - **The hardware is moving in parallel.** Micas Networks showed three 102.4T platforms at OCP 2026: a 4RU air-cooled unit with 128 ports of 800G (production Q4 2026, the only one running on the stand), a 2RU liquid-cooled unit with 64 ports of 1.6T (Q4 2026) and a 1RU CPO unit (Q1 2027). All three run SONiC. ## What this means for the business A white box on Tomahawk 6 with OcNOS or SONiC: the cheapest road to 1.6T in an AI fabric. For the price difference against a branded switch you pay with one thing. The chip maker, the box maker and the OS maker are 3 different companies, and none of them has signed off on how the whole combination behaves under your training job. "Lossless RoCE" in a press release means PFC and ECN are configurable. Whether they survive incast from 512 GPUs is a separate question. Part of the money saved on the box is worth spending on acceptance tests. Otherwise the saving turns into a stopped training run and a month of finger-pointing between 3 vendors. ## What this means for engineers A checklist for a 102.4T white box before production, in order of pain: - RFC 2544 and RFC 2889 on every port type you will use: 200G, 800G, 1.6T. Throughput, latency, loss, frame sizes from 64 bytes to jumbo. Line rate on 64 ports at once, not on the 2 ports from the demo. - **PFC under RoCEv2 load:** incast 8:1 and above, microbursts, pause frame storms, PFC deadlock scenarios. Count how many pause frames the switch sends, how long they last and whether loss appears despite them. - **ECN:** marking threshold, the share of marked packets under load and the congestion control reaction on the NIC side. A wrong ECN profile does not drop packets; it quietly kills Job Completion Time. - **ECMP load balancing:** flow entropy, hash polarization on a two-tier topology, skew between uplinks under AllReduce and AllToAll patterns. - **Failure behaviour:** a link flap on the spine, reconvergence time, traffic loss in milliseconds rather than in the word "fast". - **Telemetry:** do the counters you will rely on in production agree with what the traffic generator saw. All of this is measured on an emulated fabric before the first GPU arrives. The IETF BMWG draft on AI fabric benchmarks gives a ready list of metrics: JCT, tail latency, PFC pauses, ECN marking rate. ## What to do Is a Tomahawk 6 white box in your plan for 2027? Write the acceptance program now, while the OS is in preview. Put the thresholds into the contract. Then run the program on a testbed, on the same OS build you will deploy. Contact TEST4NET: we will help you turn this checklist into a test program for your fabric. ## Sources - [IP Infusion: OcNOS Goes 102.4T, support for Broadcom Tomahawk 6 platforms](https://www.ipinfusion.com/news/ocnos-goes-102-4t-ip-infusion-announces-support-for-broadcom-tomahawk-6-platforms/) - [IP Infusion: Broadcom Tomahawk 6 technology page](https://www.ipinfusion.com/technology/tomahawk-6/) - [Converge Digest: IP Infusion brings Broadcom Tomahawk 6 support](https://convergedigest.com/ip-infusion-broadcom-tomahawk-6-102tbps-ai-networking/) - [StorageReview: Micas Networks puts Tomahawk 6 in three 102.4T switches](https://www.storagereview.com/news/micas-networks-tomahawk-6-102t-switches-davisson-cpo) - [StorageReview: Broadcom ships Tomahawk 6 switch series](https://www.storagereview.com/news/broadcom-ships-tomahawk-6-switch-series-unleashing-102-4-tbps-switching-capacity) Share Pass it on to someone who runs a network Independent lab data is most useful in the hands of the people who make the call. Send this piece to a colleague. 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With 19+ years in performance and load testing on IXIA, Spirent, Keysight, Xena and Xinertel platforms, he runs NGFW, WAF, IPS, DLP and SASE evaluations for telecom operators, banks and system integrators. [LinkedIn](https://www.linkedin.com/in/azemskov/) [Website](https://test4net.com/?hsLang=en) [Previous article An IETF draft on benchmarking AI fabrics: Job Completion Time instead of the Gbps from the datasheet](https://test4net.com/blog/ietf-bmwg-ai-fabric-benchmark-draft-jct?hsLang=en) In this article On the bench ### Have a device to put through this? Send us the shortlist and the KPIs that decide it. We will come back with a scoped test plan, a timeline and a fixed price. [Talk to a test engineer](https://test4net.com/contacts?hsLang=en) Industry News ## Keep reading [![An IETF draft on benchmarking AI fabrics: Job Completion Time instead of the Gbps from the datasheet](https://test4net.com/hs-fs/hubfs/blog-covers/ietf-bmwg-ai-fabric-benchmark-draft-jct.png?width=880&height=550&name=ietf-bmwg-ai-fabric-benchmark-draft-jct.png)](https://test4net.com/blog/ietf-bmwg-ai-fabric-benchmark-draft-jct?hsLang=en) [News](https://test4net.com/news?hsLang=en) [Industry](https://test4net.com/news#industry) ### [An IETF draft on benchmarking AI fabrics: Job Completion Time instead of the Gbps from the datasheet](https://test4net.com/blog/ietf-bmwg-ai-fabric-benchmark-draft-jct?hsLang=en) On October 8, 2026, revision 05 of draft-calabria-bmwg-ai-fabric-training-bench appeared in the IETF datatracker: a benchmarking methodology for the Ethernet fabric of AI… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 29, 2026 · 4 min read [![How we test Wi-Fi 6, 6E and 7: 200 clients, roaming and the TR-398 sheet](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-wi-fi-6-6e-7.png?width=880&height=550&name=how-we-test-wi-fi-6-6e-7.png)](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Protocols](https://test4net.com/blog/tag/protocols) ### [How we test Wi-Fi 6, 6E and 7: 200 clients, roaming and the TR-398 sheet](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) Every access point datasheet carries a PHY rate: 5.4 Gbit/s, 11 Gbit/s, 46 Gbit/s for Wi-Fi 7. The number is the modulation table. What a client gets in a meeting room wi… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 28, 2026 · 4 min read [![How we test TLS and HTTPS: handshakes per second with inspection switched on](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-tls-and-https.png?width=880&height=550&name=how-we-test-tls-and-https.png)](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Protocols](https://test4net.com/blog/tag/protocols) ### [How we test TLS and HTTPS: handshakes per second with inspection switched on](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) The datasheet of a firewall or a load balancer states "TLS throughput". 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