#570: 100 Terabit Smart Switches: What You Need to Know
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The future of data center networking is accelerating at breakneck speed, with 100 terabit-per-second switches like Cisco's G300 and NVIDIA's Spectrum 6 now entering production—delivering unprecedented performance for AI workloads. Will, a senior Cisco executive, reveals that the industry is no longer debating InfiniBand vs. Ethernet; Ethernet has won, especially as customers scale to hundreds of thousands of GPUs. But the real shift isn't just speed—it's programmability: switches now support dynamic policy enforcement at 100 terabits, enabling features like intelligent congestion control that were previously impossible. The rise of co-packaged optics (CPO) promises massive power savings but raises concerns about vendor lock-in, sparking early industry debates on standardization. Meanwhile, AI is transforming software development itself: what was once called 'vibe coding' is evolving into 'harness-based development,' where AI agents refactor legacy C code into modern Golang with 4x code reduction and improved testability—proving that AI isn't just automating tasks but redefining engineering quality. Cisco is betting big on this shift, integrating AI into its network OS (Sonic), DPU services, and even security enforcement directly on NICs. The result? A new paradigm where policy enforcement is distributed across switches, servers, and DPUs—making traditional firewalls obsolete in the data center core.
100 terabit switches like Cisco's G300 and NVIDIA's Spectrum 6 are now shipping, enabling AI clusters to scale beyond 30,000 GPUs.
Ethernet has overtaken InfiniBand in data centers due to multi-vendor choice, scalability, and the ability to support hundreds of thousands of GPUs.
Programmable switches at 100 terabits now support dynamic congestion control, reducing bandwidth loss by intelligently truncating packets.
Co-packaged optics (CPO) offer 30-50% lower power but risk vendor lock-in, prompting early industry calls for standardization.
AI is transforming software development: legacy C code was refactored into Golang with 4x code reduction and improved testing using AI agents.
…and 3 more takeaways available in PodZeus
The 100 Terabit Switch Era Begins
“And that's the 100 terabits per second, 64 times 1.6 terabits per second interfaces on the switch. And then we announced we've been in development on the Spectrum 6, which is the 100 terabit switch from NVIDIA, and that that is going to be orderable soon.”
Ethernet vs. InfiniBand: The Winner Is Clear
InfiniBand is no longer the default for large-scale AI clusters. Ethernet now dominates due to scalability, multi-vendor support, and the ability to handle hundreds of thousands of GPUs.
The Rise of Programmable Switches at 100 Tbps
“In some of these cases, we truncate the packet, send what's left, but include a bit that says, hey, this is something where we are seeing congestion. And so it reduces the overall bandwidth.”
Co-Packaged Optics: Power Gains, Vendor Risks
Co-packaged optics (CPO) offer major power savings but raise concerns about single-vendor dependency and reduced flexibility compared to pluggable optics.
AI Is Rewriting Software Development
“The biggest one was the Claude was talking about making, Anthropoc was talking about making a C compiler that could compile the Linux kernel, which for me was a big wake up.”
“The biggest one was the Claude was talking about making, Anthropoc was talking about making a C compiler that could compile the Linux kernel, which for me was a big wake up.”
“that's the 100 terabits per second, 64 times 1 .6 terabits per second interfaces on the switch. And then we announced we've been in development on the Spectrum 6, which is the 100 terabit switch from NVIDIA, and that that is going to be orderable soon.”
“Your traditional firewall no longer is all you have. Now you're putting the firewall everywhere, basically.”
Host
Guest
Cisco
organization
NVIDIA
organization
G300
product
DPUs
other
Sonic
product
Spectrum 6
product
Segment Routing
other
Hyperfabric
product
eBPF
other
ShareNAI
organization
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