Overview and Technical Specifications

The ​​C9300X-NM-8Y-M​​ is a high-density network module designed for Cisco Catalyst 9300X Series switches. It adds ​​8x 25G SFP28 ports​​ to compatible chassis, enabling flexible uplink scaling for bandwidth-intensive applications like data center interconnects, high-performance computing (HPC), or 5G backhaul. This module operates at Layer 3 and supports ​​Cisco’s Flexible NetFlow​​ for granular traffic analysis, along with ​​MACsec encryption​​ to secure high-speed data transmission.

​​Key attributes​​:

  • ​​Port density​​: Adds 200G of uplink capacity per module (8x 25G).
  • ​​Hot-swappable design​​: Allows installation without disrupting switch operations.
  • ​​Forwarding rate​​: Supports line-rate throughput at 25G speeds with <1.5μs latency.

Addressing Critical User Questions

Q: Which Catalyst switches support the C9300X-NM-8Y-M?

A: The module is compatible with ​​Catalyst 9300X models​​ like the C9300X-48HX and C9300X-48HXN-A. It occupies one modular slot and requires ​​Cisco IOS XE 17.6.1 or later​​ for full functionality.

Q: Can the 25G ports be used for breakout configurations?

A: No. Unlike 40/100G QSFP ports, the ​​25G SFP28 interfaces​​ on this module do not support breakout cables. They are ideal for direct 25G server links or spine-leaf topologies.

Q: How does it handle power consumption?

A: The module draws ​​up to 60W​​ under full load but integrates with the switch’s power redundancy system. For environments using dual power supplies, it ensures uninterrupted operation.


C9300X-NM-8Y-M vs. Alternative Modules: Strategic Advantages

Compared to the ​​C9300-NM-8Q​​ (8x 10G ports), the C9300X-NM-8Y-M offers ​​2.5x higher per-port throughput​​ and lower latency, making it better suited for modern AI/ML workloads or NVMe-oF storage networks.

​​Feature​​ ​​C9300X-NM-8Y-M​​ ​​C9300-NM-8Q​​
Port Speed 25G 10G
Max Uplink Capacity 200G 80G
Encryption Support MACsec (256-bit) IPsec only
Ideal Use Case HPC, AI clusters Legacy data center links

For enterprises modernizing infrastructure, the 25G module future-proofs networks while reducing port sprawl.


Purchasing and Integration Recommendations

The “C9300X-NM-8Y-M” is available for order via itmall.sale, which offers genuine Cisco modules with full warranty coverage.

​​Observations from deployment experience​​: The C9300X-NM-8Y-M shines in environments where low-latency, high-throughput east-west traffic is critical. Its inability to break out 25G ports may limit flexibility in some scenarios, but for hyperscale applications—such as GPU-driven AI training or real-time analytics—it delivers unmatched ROI. Pairing it with Catalyst 9300X switches creates a cohesive ecosystem that balances scalability, security, and operational simplicity. While not a one-size-fits-all solution, it’s a strategic upgrade for organizations transitioning to 25G/100G architectures.

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