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As AI training and inference scale, the network must function as an extension of the compute fabric. This session explores the architectural requirements for high-performance AI data centers. We will examine the shift toward deterministic networking to mitigate tail latency and fabric congestion, alongside critical hardware innovations — including advanced cooling and next-generation optics, designed to maximize performance and power efficiency. Attendees will gain technical insights into building a unified, programmable fabric that optimizes performance and scalability for high-density AI environments.
The presentation details Cisco’s strategic use of its Silicon One architecture, specifically the G-Series for AI scale-out and the P-Series for “scale-across” data center interconnects. The G-Series, highlighted by the G200 and G300 ASICs, provides high-radix connectivity with up to 512 ports of 200G and fully shared packet buffers to eliminate the performance bottlenecks found in traditional slice-based architectures. A core focus is the Cisco Intelligence Packet Flow (IPF), which enables advanced load balancing techniques such as packet spraying and flowlet switching. These features allow Ethernet to mimic the lossless properties of InfiniBand, ensuring high job completion times for RDMA-heavy AI workloads while maintaining a programmable pipeline that can adapt to evolving standards like Ultra Ethernet mid-cycle.
Hardware innovation is further demonstrated through new form factors and cooling solutions designed for high-density AI environments. Cisco introduced liquid-cooled chassis, such as the N9364F-SG3-L, which achieves 100% liquid cooling to handle the massive power requirements of 100-terabit ASICs without the need for fans. These systems support next-generation optics, including Linear Pluggable Optics (LPO) that reduce power consumption by half and coherent ZR/ZR+ optics for long-haul connectivity up to 1,000 km. Additionally, Cisco’s partnership with NVIDIA was underscored through the N9100 series, which integrates NVIDIA Spectrum-4 and Spectrum-6 silicon into the Cisco ecosystem. This gives customers the choice between a vertically integrated Cisco fabric or an end-to-end NVIDIA Spectrum-X solution, all managed through a consistent operating system and the Nexus Dashboard.
Personnel: Faraz Taifehesmatian
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