The Cisco N9K-C93180YC-FX3H and N9K-C93180YC-FX3 are often compared for data center leaf, top-of-rack, and server aggregation deployments. The key purchasing question is not whether the FX3H has only 24 physical ports. It has 48 physical SFP28 downlink ports, but the initial license activates any 24 of them. If all 48 downlink ports are required, a supported 24-port upgrade license must be installed.
- Review downlink ports, uplinks, and active port capacity.
- Understand the difference between physical ports and licensed ports.
- Review the upgrade license and deployment checks.
- Choose between phased expansion and immediate 48-port capacity.
- Confirm licensing, optics, software, power, and airflow requirements.
- Find answers to common FX3H port license and upgrade questions.
- Summarize the best use case for FX3H and FX3.
Are FX3H and FX3 the Same Hardware?
The N9K-C93180YC-FX3H and N9K-C93180YC-FX3 belong to the same general Cisco Nexus 93180YC-FX3 platform family. Both use a 1RU fixed-port design with SFP28 downlink ports and QSFP28 uplinks.
The practical purchasing difference is the number of downlink ports activated by the initial license. The FX3H is a 24-port licensed configuration, while the FX3 is the full 48-port configuration.
| Item | N9K-C93180YC-FX3H | N9K-C93180YC-FX3 |
|---|---|---|
| Physical downlinks | 48 × 1/10/25G SFP28 | 48 × 1/10/25G SFP28 |
| Default active downlinks | Any 24 of 48 | 48 |
| Uplinks | 6 × 40/100G QSFP28 | 6 × 40/100G QSFP28 |
| Form factor | 1RU fixed-port switch | 1RU fixed-port switch |
| Expansion path | Supported 24-port upgrade license | No additional downlink activation required |
You can compare the N9K-C93180YC-FX3H product details with the N9K-C93180YC-FX3 product details before preparing a bill of materials.
Send your current and future port requirements.
N9K-C93180YC-FX3H vs FX3 Port Configuration
Both models are designed for high-density data center connectivity. Their downlink ports support 1G, 10G, and 25G Ethernet through SFP28 interfaces, while the six QSFP28 uplinks support 40G and 100G connectivity.
N9K-C93180YC-FX3H
The FX3H provides 48 physical SFP28 downlink ports, but the default license allows any 24 of those ports to be used. This makes the platform suitable for deployments that currently need 24 active ports but may expand later.
- 48 physical 1/10/25G SFP28 downlink ports
- Any 24 downlink ports active under the initial license
- Six 40/100G QSFP28 uplinks
- 24-port to 48-port expansion through a supported license
N9K-C93180YC-FX3
The FX3 is the full 48-port configuration of the platform. It is a more direct fit when the project requires high-density 25G server or storage connectivity from the initial deployment.
- 48 active 1/10/25G SFP28 downlink ports
- Six 40/100G QSFP28 uplinks
- Suitable for full-density leaf or top-of-rack deployments
- No later downlink port activation required
The physical port pattern should be evaluated together with the intended server, storage, optic, DAC, and breakout-cable requirements. The active port count is a licensing decision, while the interface speed is a hardware and transceiver compatibility decision.
For official port descriptions and licensing notes, review the Cisco N9300-EX, FX, and FX3 Data Sheet.
How the FX3H 24-Port License Works
The FX3H port license controls how many of the physical downlink ports can be used. It does not mean that the chassis contains only 24 physical interfaces.
The initial port arrangement can be summarized as follows:
- 48 physical SFP28 downlink ports
- Any 24 downlink ports active by default
- Six QSFP28 uplink ports
- 1/10/25G Ethernet support on the downlinks
- 40/100G Ethernet support on the uplinks
Any 24 Ports Can Be Selected
The FX3H license is not limited to ports 1 through 24. Any 24 downlink ports can be selected according to the rack layout, cabling plan, and deployment design.
The Uplinks Are Separate
The six 40/100G QSFP28 uplinks are separate from the 24-port downlink license. The downlink license does not add or remove uplink interfaces.
| Capacity Item | FX3H Default Configuration | FX3 Configuration |
|---|---|---|
| Physical downlinks | 48 | 48 |
| Licensed downlinks | Any 24 | 48 |
| Uplink ports | 6 × 40/100G QSFP28 | 6 × 40/100G QSFP28 |
How to Upgrade FX3H to 48 Active Ports
To use all 48 physical downlink ports on the FX3H, the switch requires a supported 24-port upgrade license. The upgrade activates existing physical interfaces; it does not add a new line card or require chassis replacement.
Cisco’s current data sheet lists upgrade license options including N9K-FX3-24P-UPG=, N9K-FX-24P-UPG=, and N9K-EX-24P-UPG=. The exact supported PID should be confirmed against the current Cisco licensing guide, software release, operating mode, and quotation before ordering.
Recommended Upgrade Checks
- Confirm the exact hardware PID.
- Check the currently active port license.
- Confirm whether the switch runs in NX-OS mode or ACI mode.
- Verify the installed software release.
- Confirm the supported 24-port upgrade license PID.
- Register or install the license according to the applicable Cisco procedure.
- Verify the additional downlink ports after activation.
- Check optics, FEC settings, interface status, and end-to-end connectivity.
If the project has a strict installation schedule, the port upgrade should be planned before the rack is fully populated. Licensing account setup, upgrade PID confirmation, and software compatibility can affect the deployment timeline.
FX3H or FX3: Which One Should You Buy?
The buying decision depends on current port demand, expected growth, and whether the project wants to manage a future port activation.
| Requirement | Recommended Option | Reason |
|---|---|---|
| 24 active ports are sufficient today | FX3H | Provides a 24-port starting configuration with future expansion potential |
| 48 active ports are required immediately | FX3 | Provides full port capacity from the beginning |
| Future expansion is likely | FX3H with upgrade planning | Existing physical ports can be activated later with a supported license |
| The project wants a simple 48-port BOM | FX3 | A later port activation step is not required |
Choose FX3H When
- The current deployment needs 24 active downlink ports or fewer.
- The project may expand to 48 active ports later.
- The organization wants to phase port activation.
- The future upgrade license can be included in the expansion plan.
Choose FX3 When
- The deployment requires more than 24 active ports immediately.
- The switch will be fully populated during the initial installation.
- The project wants to avoid a later port activation transaction.
- The network requires high-density 25G connectivity from day one.
Do not compare only the initial switch price. Review the complete deployment cost, including the future upgrade license, support requirements, optics, power supplies, airflow, and project schedule.
Buying and Compatibility Checklist
Before ordering an FX3H or FX3, confirm the following technical and procurement details.
- Exact hardware PID
- Required number of active downlink ports
- Current and future port requirements
- Need for a 24-port to 48-port upgrade
- Required 1G, 10G, or 25G downlink speeds
- Required 40G or 100G uplink speeds
- Optic, DAC, or breakout-cable models
- NX-OS or ACI operating mode
- Required software release
- FEC requirements
- Airflow direction
- Power-supply configuration
- Required feature licenses
- Smart Licensing or account requirements
- Quantity, deployment region, and project schedule
If you are planning to use 24 active ports initially and expand to 48 later, include that plan in the quote request. This allows the hardware, upgrade license, optics, and licensing requirements to be reviewed together.
You can send your Nexus port requirements for review before finalizing the bill of materials.
People Also Ask (FAQ)
Final Takeaway
The N9K-C93180YC-FX3H and N9K-C93180YC-FX3 use the same general 93180YC-FX3 port architecture: 48 physical 1/10/25G SFP28 downlinks and six 40/100G QSFP28 uplinks.
The FX3H is licensed for any 24 downlink ports by default and can be expanded to 48 active ports with a supported upgrade license. The FX3 provides the full 48-port configuration from the beginning.
Choose the FX3H for phased deployment and future expansion. Choose the FX3 when full port capacity is required immediately. Before ordering, confirm the exact PID, active port count, upgrade license, operating mode, software release, optics, and deployment requirements.