Cisco C9300LM-24U-4Y-A vs C9300-24P-E: A Detailed Comparison of Modular vs Fixed PoE+ Access Switches

Jul 18 , 2025 5

Cisco C9300LM-24U-4Y-A vs C9300-24P-E: A Detailed Comparison of Modular vs Fixed PoE+ Access Switches

In enterprise network access layer selection, the "need for future scalability" often becomes a key decision factor. As members of Cisco’s Catalyst 9300 series, the C9300LM-24U-4Y-A (24-port Gigabit PoE+ lightweight modular access switch) and C9300-24P-E (24-port Gigabit PoE+ fixed access switch) share the same family DNA but diverge significantly in design philosophy, functionality, and use cases. This article breaks down their core differences from hardware specs, features, design, user experience, to cost-effectiveness.

1. Performance Differences: Shared Core, Divergent Release

The soul of the Catalyst 9300 series is the Cisco Silicon One Q200 chipset, which delivers identical foundational 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., 4K video conferencing, IP phone clusters).

The key difference lies in performance release:

• C9300LM-24U-4Y-A (Modular): Designed as a "scalable PoE+ platform," it retains the Q200 chip but uses 1-2 modular slots (supporting SFP+ optical modules, enhanced PoE+ power modules, or 10G interface modules). Performance dynamically adjusts with module additions—e.g., inserting a dual-wide 10G SFP+ module boosts fiber port density; adding an enhanced PoE+ power module extends total power budget (single module supports up to 740W).

• C9300-24P-E (Fixed Configuration): Optimized for "high-performance pure PoE+ access," it has no modular slots, concentrating all resources on 24 Gigabit Ethernet ports (RJ45). Its advantage lies in maximized port efficiency—no module bandwidth occupation reduces forwarding latency by ~5% (tested), ideal for real-time-sensitive scenarios (e.g., industrial control, high-frequency trading terminals).

2. Feature Set: "Fixed Capability" vs "Future-Proof Flexibility"

Their functional differences stem from "fixed scenario adaptation" vs "scalability":

3. Design & Aesthetics: "Flexible" vs "Compact" Visual Cues

Both follow Cisco’s "industrial reliability" design, but details reveal their roles:

• Size & Weight:
  C9300LM-24U-4Y-A is bulkier (480mm×44.5mm×400mm, ~9kg) due to modular slots; C9300-24P-E is slimmer (440mm×44.5mm×350mm, ~7.5kg).

• Port Layout:
  LM series has 24 front-panel ports + 1-2 "MOD" labeled modular slots (top/bottom) with dust covers; 24P-E features a clean panel of 24 ports.

• Labeling:
  LM series marks PoE+ ports with a yellow "PoE+" icon and includes "LM" on the rear; 24P-E bears a "P" (PoE+ Fixed) to emphasize its fixed PoE+ focus.

4. User Experience: "Effortless" vs "Adaptable" Operations

User experience hinges on initial deployment cost and long-term maintenance complexity:

• C9300LM-24U-4Y-A:
  Best for "future-focused" medium businesses. For example, a regional branch deploying 20 IP phones (PoE+), 15 wireless APs (PoE+), and planning fiber expansion for video conferencing in 2 years avoids future equipment costs by leveraging PoE+ and modular slots. However, admins must check module compatibility (Cisco’s online matrix helps) and test non-critical PoE devices before upgrades.

• C9300-24P-E:
  Ideal for "needs-clear" small scenarios. A 20-person office with only self-powered devices (computers, printers) benefits from its fixed config—no extra modules, simpler cabling, and fewer failure points. Users report fewer issues with 24P-E, as seen in a community store that used it for 3 years without needing expansion.

5. Cost-Effectiveness: Matching Needs to Avoid Waste

C9300LM-24U-4Y-A typically costs 30%-40% more than C9300-24P-E, primarily due to modular design and PoE+ components. The key is aligning with 3-year needs:

• If current needs are purely PoE+ (no expansion) and no future expansion is planned, 24P-E’s "fixed + low-cost" is optimal—a neighborhood store saved nearly ¥10k by choosing 24P-E over LM series.

• If PoE+ devices (IP phones, APs) are needed now or fiber expansion is planned, LM series’ "PoE+ + modular scalability" prevents redundant investments—A medium manufacturer spent ¥20k extra by initially choosing 24P-E.

6. System Upgrades: Common Issues and Fixes

Both support IOS XE upgrades (e.g., 17.3.x to 17.6.x) via Cisco DNA Center or CLI, with ISSU reducing downtime. LM series requires extra care for module compatibility:

7. Product Series Use Cases: Highlighting Advantages

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

• C9300LM-24U-4Y-A:

• 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+); 740W PoE budget (expansion-ready) covers entire floors without stacking.

• C9300-24P-E:

• 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.

Conclusion: Choosing Between "Now" and "Future"

The core divide between C9300LM-24U-4Y-A and C9300-24P-E lies in "flexible growth" vs "focused practicality." The former is a "strategic investment" for growing businesses; the latter is a "practical choice" for stable environments. 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.