What Is the Cisco C9300LM-48UX-4Y-E? High-Density UPOE, 25G Uplinks, and Campus Deployment Insights



​Overview of the C9300LM-48UX-4Y-E​

The Cisco C9300LM-48UX-4Y-E is a ​​high-density, modular Layer 3 switch​​ designed for large campus and IoT environments requiring extreme Power over Ethernet (PoE) scalability and 25G uplink performance. Part of the Catalyst 9300L modular series, it supports hybrid work infrastructures, smart buildings, and data-heavy academic networks.


​Core Technical Specifications​

  • ​Port Configuration​​: 48 x Multi-Gigabit Ethernet ports (1/2.5/5/10G) with ​​UPOE+ (90W per port)​​ + 4 x 25G SFP28 uplinks.
  • ​Power Budget​​: ​​1,800W total PoE capacity​​, enabling simultaneous support for ​​high-wattage devices​​ like building automation controllers, 802.11ax APs, and industrial IoT gateways.
  • ​Performance​​: ​​480 Gbps switching capacity​​ with ​​Cisco DNA Essentials licensing​​ pre-installed for basic automation, threat detection, and QoS management.
  • ​Scalability​​: Modular design supports ​​StackWise®-480​​ for stacking up to 8 units with 480 Gbps stacking bandwidth.

​Key Use Cases and User Concerns​

​Q: When is the 25G uplink essential?​
The four 25G uplinks are critical for ​​aggregating traffic from multiple access switches​​ or connecting to a 40/100G core in large campuses, hospitals, or smart cities.

​Q: Can this switch handle legacy and future IoT devices?​
Yes. The Multi-Gig ports support older 1G devices while providing ​​10G readiness​​ for emerging IoT sensors and 4K/8K video systems.


​C9300LM-48UX-4Y-E vs. Fixed Catalyst 9300L Models​

Unlike fixed models like the C9300L-48UXG4X-1A, this modular switch offers ​​hot-swappable power supplies and fans​​, ensuring zero downtime during maintenance. The 25G uplinks also provide ​​3x the bandwidth​​ of standard 10G SFP+ ports, future-proofing backbone connectivity.


​Licensing and Procurement Guidance​

The “E” suffix confirms ​​Cisco DNA Essentials licensing​​, covering foundational security and network automation. Upgrading to DNA Advantage unlocks AI-driven insights and SD-Access for micro-segmentation.

For guaranteed authenticity and bulk pricing, visit the “C9300LM-48UX-4Y-E” at itmall.sale, a certified Cisco partner specializing in enterprise-grade hardware.


​Practical Insights from Large-Scale Deployments​

Having deployed similar switches in university campuses, the C9300LM-48UX-4Y-E’s ​​1,800W PoE budget​​ eliminates the need for midspan injectors in sprawling IoT setups. However, its modular design demands careful thermal planning—ensure rack airflow meets Cisco’s guidelines to prevent overheating. For organizations eyeing 25G/40G core upgrades, this switch bridges the gap between access and distribution layers seamlessly, though its premium cost warrants a clear ROI strategy for smaller deployments. Always verify IoT device power requirements; overestimating wattage per port can lead to underutilized capacity.

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