![]() ![]() Another advantage of removing the midplane is significantly improved mean-time-to-repair. The Cisco Nexus 9800 Series alleviates the need for midplane installation or upgrade. ![]() This introduces complexity and more service disruption to the hardware upgrade process. In some cases where new components, such as new line cards or new fabric modules, are introduced, an upgrade to the midplane is required. The midplane-free chassis design simplifies the switch platform deployment and hardware upgrade. It also allows a compact chassis design without the need for large cooling fans. Without a midplane blocking the airflow path, the chassis design delivers maximized cooling efficiency. Line cards and fabric modules have orthogonal orientations in the chassis so that each fabric module is connected to all line cards and vice versa. With a precise alignment mechanism, Nexus 9800 Series Switch line cards and fabric modules directly attach to each other with connecting pins. Hence, additional methods need to be applied to facilitate an airflow path (for example, cut-outs on the midplane or airflow redirection), which result in reduced cooling efficiency. Being an extra piece of hardware inside the switch chassis, it obstructs the cooling airflow. A midplane is commonly used in modular platforms to provide connectivity between line cards and fabric modules. The chassis of the Cisco Nexus 9800 Series Switches has an innovative midplane-free design (Figure 2). ![]() These design principles allow the doubling of total system capacity with next-generation line cards and fabric modules that support higher speed ports, such as 800G, at the same port density per slot as that of current-generation line cards. The design of the Cisco Nexus 9800 Series chassis is a significant improvement on previous-generation modular chassis design with better power distribution, connectors, fans, and thermal design that allow the chassis to scale up to higher Ethernet speed line cards and fabric modules in the future. Max forwarding throughput per system (Tbps) The ASIC provides these capabilities without compromising on features and power efficiency, which enables the Cisco Nexus 9800 Series Switches to be optimized for supporting high-bandwidth applications across data centers of varying sizes and scale.įurthermore, the chassis architecture supports control plane redundancy with dual supervisors, data plane redundancy with up to eight fabric modules, fan tray redundancy with four fan trays, and power supply redundancy. The Cisco Nexus 9800 Series Switch line cards and fabric modules are built with a power-efficient, high-performance, and high-capacity ASIC that supports fully shared on-die packet buffering. Each line card slot in the chassis can support line cards that offer 400GE or 100GE or 10/25/50GE ports. The 8-slot Cisco Nexus 9808 Switch (Figure 1) is the first available platform in the family that will be followed by the 4-slot platforms. The Cisco Nexus 9800 Series Switches are highly scalable, deep-buffered, on-chip High Bandwidth Memory (HBM), 400G-optimized data-center switches that range from 57 Tbps to 115.2 Tbps. The Q200 ASIC delivers high-scale routing and deep buffering, both of which typically require off-chip memories. The Cisco Nexus 9800 Series Switches utilize the second-generation Q200 Silicon One ASIC with increased performance to 12.8 Tbps in 7-nm process technology. ![]() This white paper focuses on the common hardware architecture of Cisco Nexus 9800 Series Switches and the packet-forwarding implementation in the classic NX-OS mode. The Cisco Nexus 9800 Series modular switches expand the Cisco Nexus 9000 Series portfolio with a new chassis that supports extremely high port density 400 Gigabit Ethernet line cards. When they operate in ACI mode, Nexus 9800 series switches function as the fabric spine nodes to form the foundation of the transformational ACI architecture for a fully integrated and automated network fabric solution driven by an application network profile. The Cisco Nexus 9800 Series Switches combine the Cisco ® revolutionary Silicon One ™ Application-Specific Integrated Circuits (ASICs), Cisco NX-OS (Nexus Operating System), or Cisco Application Centric Infrastructure (Cisco ACI ®) software, and a new platform design to deliver a breakthrough in high-performance data-center switches. ![]()
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