Cisco C9300-24T-A vs C9300LM-24U-4Y-E: A Detailed Comparison from Basics to Scalability

Jul 18 , 2025 5

Cisco C9300-24T-A vs C9300LM-24U-4Y-E: A Detailed Comparison from Basics to Scalability

In enterprise network access layer selection, the "fixed configuration" vs "modular scalability" of switches often becomes a key decision point. As members of Cisco’s Catalyst 9300 series, the C9300-24T-A (24-port Gigabit non-PoE fixed access switch) and C9300LM-24U-4Y-E (24-port Gigabit PoE+ modular access switch) share the same family DNA but diverge significantly in design, functionality, and use cases. This article breaks down their core differences from hardware specs, features, design, user experience, to cost-effectiveness.

1. Basic Performance: Hardware Architecture – Shared Foundations and Scalable Differences

A key advantage of the Catalyst 9300 series is its unified Cisco Silicon One Q200 chipset, which delivers high performance for both models:

• Processing Speed: Both leverage the Q200 chip, offering a switching capacity of ~2.56Tbps and packet forwarding rate of 1.92Mpps, easily handling enterprise-level high-throughput demands (e.g., simultaneous 4K video, voice, and data transmission).

• RAM: Both come with 4GB DDR4 RAM, expandable to 8GB (via optional memory modules), supporting complex protocols like IPv6 routing and OSPF.

• Storage: Both include 4GB eMMC flash for system images and configs, with support for USB 3.0 external storage (up to 2TB).

The key difference lies in modular scalability:
C9300LM-24U-4Y-E is positioned as a "lightweight modular" switch, featuring reserved modular slots (typically 1-2) for expanding SFP+ optical modules, PoE+ power modules, or additional interface modules (e.g., dual-wide 10G modules). In contrast, C9300-24T-A is a fixed-configuration device with only 24 Gigabit Ethernet ports (RJ45), offering no expansion capabilities. This design makes the LM series more adaptable to future network upgrades.

2. Feature Set: PoE+ and Modularization as Dual Differentiators

The core differences extend beyond "PoE capability" to "future-proofing":

3. Design and Aesthetics: Modular Nuances in Detail

Both models follow Cisco’s "industrial reliability" design philosophy but differ in subtle details:

• Dimensions & Weight: C9300-24T-A is more compact (440mm×44.5mm×350mm, ~7.5kg); C9300LM-24U-4Y-E is slightly deeper (~400mm) and heavier (~8.5kg) due to modular slots.

• Port Layout: C9300-24T-A features 24 fixed ports on the front panel; C9300LM-24U-4Y-E has 24 ports + 1-2 modular slots (labeled "MOD") for expansion, typically on the top/bottom.

• Labeling: C9300LM-24U-4Y-E marks PoE+ ports with a yellow "PoE+" icon and includes "LM" (Lightweight Modular) on the rear to emphasize its modular identity.

4. User Experience: Flexibility in Deployment and O&M

For IT admins, the user experience hinges on initial deployment costs and long-term scalability ease:

• C9300-24T-A: Ideal for "set-it-and-forget-it" small scenarios. For example, a 20-person office needing only computers and printers (self-powered) benefits from its fixed configuration—no extra PoE modules, simpler cabling (just Ethernet), and easier troubleshooting (no module compatibility issues).

• C9300LM-24U-4Y-E: Better for "future-focused" medium businesses. A regional branch office deploying 30 IP phones (PoE+), 10 wireless APs (PoE+), and planning fiber expansion for video conferencing in 2 years avoids future equipment replacement costs by leveraging its PoE+ support and modular slots.

5. Cost-Effectiveness: Matching Needs to Avoid Waste

C9300LM-24U-4Y-E typically costs 25%-35% more than C9300-24T-A, primarily due to modular design (extra circuitry, slots) and PoE+ components. The key is aligning with 3-year needs:

• If current needs are purely data-based (no PoE devices) and no expansion is planned, C9300-24T-A’s "fixed + low-cost" is optimal.

• If PoE devices (IP phones, APs, cameras) are needed now or fiber expansion is planned, C9300LM-24U-4Y-E’s "PoE+ + modular scalability" prevents redundant investments, offering better long-term value.

6. System Upgrades: Common Issues and Solutions

Both support IOS XE upgrades (e.g., 17.3.x to 17.6.x) via Cisco DNA Center or CLI, with ISSU (in-service upgrade) minimizing downtime. However, LM’s modular design requires extra compatibility checks:

7. Product Series Use Cases: Highlighting Advantages

C9300 series targets "all-scenario enterprise access," but their unique traits define distinct use cases:

• C9300-24T-A:

• Small offices/retail stores: Employee computers, printers, surveillance cameras (self-powered); fixed config simplifies deployment.

• School computer labs: Student PCs, interactive whiteboards (no PoE needs); fixed config reduces initial costs.

• Branch edge nodes: Local device connectivity with fiber uplinks; fixed config streamlines edge operations.

• C9300LM-24U-4Y-E:

• Medium enterprise headquarters: IP phones, wireless APs, video conferencing terminals (PoE+); modular slots support future room/branch expansion.

• Industrial parks: PLC controllers (self-powered), industrial cameras (PoE+), ruggedized gateways (fiber via modules); modules adapt to harsh environments.

• University buildings: Classroom IP phones, APs, digital boards (PoE+); 370W PoE budget covers entire floors without stacking.

Conclusion: Choosing Between "Now" and "Future"

The core divide between C9300-24T-A and C9300LM-24U-4Y-E lies in "fixed configuration" vs "modular scalability." The former is an "economical practical" choice for small businesses with clear, unchanging needs; the latter is a "flexible growth" solution for medium enterprises requiring PoE+ and future expansion. When purchasing, ask: "Do we need PoE now?" and "Will we add fiber/high-power devices in 3 years?" The answer will guide you to the model that best aligns with your network’s evolution—because "fit" often matters more than "specs" in long-term usability.