Cisco Nexus 9400 8p 400G QSFP-DD LEM

Power your data center with the Cisco Nexus 9400 8p 400G QSFP-DD LEM, a high-performance line extension module designed for scalable, ultra-dense networking. This 8-port 400G QSFP-DD LEM is engineered to maximize throughput while minimizing footprint, making it ideal for modern cloud, enterprise, and service provider environments. Built to integrate seamlessly with the Cisco Nexus 9400 family, the module delivers reliable 400 Gigabit Ethernet connectivity through a compact, modular design that supports flexible deployment strategies and future-ready bandwidth growth.

• The Cisco Nexus 9400 8p 400G QSFP-DD LEM provides 8x 400G QSFP-DD ports, delivering exceptional raw throughput and headroom for dense interconnects. This high-density configuration is tailored for data centers requiring ultra-fast east-west and spine-leaf communications, enabling large-scale aggregation and seamless bandwidth expansion as traffic patterns evolve. With 400G per port, you can scale link aggregation, host connectivity, and storage networking without compromise.
• Designed for 400GBase-X optical connectivity, the LEM supports standard, high-performance optical modules that maximize reach and compatibility across diverse fiber architectures. This flexibility is critical for building resilient networks that span short intra-data center links to longer fiber runs between data centers, while maintaining low latency and predictable performance.
• Specifically engineered for the Cisco Nexus 9400 series, the LEM integrates into the modular chassis with minimal disruption. Its compact footprint and plug-in architecture simplify deployments, hot-swapping, and field upgrades, allowing you to scale capacity incrementally and align network growth with IT demand. The result is a forward-looking solution that complements Cisco’s software-defined networking capabilities and operational tooling.
• With an emphasis on reliability and efficiency, the 8p 400G QSFP-DD LEM is optimized for dense deployments in data centers, campuses, and large enterprise networks. The design supports robust power management and thermal handling in high-density environments, helping to maintain stable performance even under sustained traffic surges. Operators appreciate the balance of performance, density, and energy efficiency that this module brings to a Cisco-based fabric.
• Versatility and future-readiness define this LEM, which aligns with modern data center architecture trends such as leaf-spine fabrics, multi-tenant overlays, and scalable network segmentation. The 8-port 400G module enables streamlined cabling strategies and simplified upgrade paths, reducing downtime and accelerating time-to-value as bandwidth requirements escalate.

Technical Details of Cisco Nexus 9400 8p 400G QSFP-DD LEM

• Product type: Line Extension Module (LEM) for Cisco Nexus 9400 series switches
• Ports: 8 x 400G QSFP-DD (per module)
• Interface standard: 400GBase-X optical connectivity
• Form factor: LEM (Line Extension Module) designed for Nexus 9400 chassis
• Aggregate potential: Up to 3.2 Tbps of total lane bandwidth per module (8 ports × 400 Gbps)
• Deployment use case: High-density data center interconnects, spine-leaf fabrics, cloud-scale workloads
• Compatibility: Optimized for Cisco Nexus 9400 series switching environments and NX-OS-based management workflows
• Reliability and serviceability: Designed for enterprise-grade reliability with straightforward field replacement in supported chassis

How to install Cisco Nexus 9400 8p 400G QSFP-DD LEM

• Before installation, verify that the Nexus 9400 chassis and supervisor modules are compatible with the 8-port 400G QSFP-DD LEM and that required fan and power configurations meet your data center’s environmental standards.
• Power down or place the target chassis into a maintenance window according to your operational policies to ensure safe insertion of the LEM without disrupting other modules.
• Identify the appropriate slot on the Nexus 9400 line card or supervisor module designed to accept a Line Extension Module. Remove any blanking plates or covers as instructed by Cisco’s deployment guidelines.
• Carefully align the LEM with the slot and insert it firmly until it seats and the locking mechanism engages. Confirm that the module is recognized by the system through the NX-OS management plane or the console interface.
• Install the 400G QSFP-DD optical transceivers and connect the fiber optic cables to the corresponding ports, ensuring correct fiber type, polarity, and routing to preserve signal integrity and reach.
• Power up the chassis (if powered down) and monitor the module LEDs for a healthy operational state. Use the Cisco management tools to verify port status, link negotiation, and transceiver compatibility across all 8 ports.
• Update or verify firmware and device drivers if required, aligning with your network’s maintenance cycle. Run basic connectivity tests and validate end-to-end paths to ensure stable throughput and expected latency.

Frequently asked questions

• Q: What is the Cisco Nexus 9400 8p 400G QSFP-DD LEM used for?

  A: It is a Line Extension Module designed to add eight 400G QSFP-DD ports to a Cisco Nexus 9400 series switch, enabling high-density, scalable 400 Gigabit Ethernet connectivity for data centers and cloud networks.

• Q: What does 400GBase-X mean for this module?

  A: 400GBase-X refers to the optical interface standard the module supports, providing ultra-high-speed data transfer over fiber links with flexible optical transceivers designed for 400 Gigabit Ethernet deployments.

• Q: Is this LEM compatible with all Nexus 9400 chassis?

  A: Compatibility is intended for specific Nexus 9400 configurations that support Line Extension Modules. Always verify exact model, slot requirements, and firmware compatibility with Cisco’s official documentation or your Cisco account representative before purchasing or installing.

• Q: How does this module affect data center scalability?

  A: By adding eight 400G ports in a single module, the LEM substantially increases usable bandwidth and port density, enabling more scalable spine-leaf fabrics, better traffic segmentation, and the ability to support growing workloads without a major hardware refresh.

• Q: What maintenance or support comes with the LEM?

  A: Support typically includes Cisco hardware warranty and access to Cisco's software and firmware updates. For detailed terms, refer to your purchasing agreement or Cisco support resources, as coverage may vary by region and contract.