N9K-C9348GC-FX3 – 48x 10M/100M/1G BASE-T – 4x 25G SFP28 + 2x 100G QSFP28 Uplinks – Nexus Switch
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N9K-C9348GC-FX3 Description
The N9K-C9348GC-FX3 is the Cisco Nexus 9348GC-FX3 Switch, the copper-access member of the N9300-FX3 Series and the one model in that series built around low-speed server and management connectivity rather than 10G or 25G downlinks. Forty-eight downlink ports run at 10M/100M/1 Gbps BASE-T, and the uplink block is split rather than uniform: 4 ports at 1/10/25 Gbps SFP28 sit alongside 2 ports at 40/100 Gbps QSFP28, a layout that within this series appears only on this switch and the 9348GC-FX3PH while the 93180YC-FX3, 93108TC-FX3 and 93108TC-FX3P all present six QSFP28 uplinks instead. Inside are a 4 core CPU, 32 GB of system memory that is both the default and the expandable ceiling, a 128 GB SSD and a 40 MB system buffer, with management through 2 ports comprising 1 RJ-45 and 1 SFP plus a single USB port. Table scale follows the series and reaches 1,792,000 IPv4 longest prefix match routes, 512,000 MAC address entries and 128,000 multicast routes. Power is the lightest in the series at 226W typical and 242W maximum, drawn from 350W AC, 440W DC or 350W HVAC/HVDC supplies ordered as NXA-PAC-350W, NXA-PDC-440W or NXA-PHV-350W parts, with cooling from NXA-SFAN-30CFM fans in either airflow direction.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
N9K-C9348GC-FX3 |
|
Downlink ports |
48 ports at 10M/100M/1 Gbps BASE-T |
|
Uplink ports |
4 ports at 1/10/25 Gbps SFP28 and 2 ports at 40/100 Gbps QSFP28 |
|
System memory |
32 GB default and 32 GB expandable |
|
Storage and buffer |
128 GB SSD drive and 40 MB system buffer |
|
Management ports |
2 ports, 1 RJ-45 and 1 SFP, plus 1 USB port |
|
Route and MAC scale |
Up to 1,792,000 IPv4 LPM routes, 1,792,000 IPv4 host entries and 512,000 MAC address entries |
|
Power supply configuration |
350W AC as NXA-PAC-350W-PI or NXA-PAC-350W-PE, with 440W DC and 350W HVAC/HVDC alternatives |
|
Power draw |
226W typical and 242W maximum |
|
Input voltage |
100 to 240V AC, 200 to 277V HVAC, -48 to -60V DC, -240 to -380V HVDC |
|
Compatible fans |
NXA-SFAN-30CFM-PI and NXA-SFAN-30CFM-PE |
Product Performance
Key Features
The downlink block runs 10M/100M/1 Gbps BASE-T rather than the 10G or 25G speeds the rest of the series carries, which suits management networks, out-of-band console aggregation and legacy server ports that would waste a faster port.
Four SFP28 ports at up to 25 Gbps and two QSFP28 ports at up to 100 Gbps give two distinct uplink tiers on one switch, so a rack can carry both a mid-speed link to a distribution layer and a high-speed link to a spine without adding a second device.
Support for 1,792,000 IPv4 longest prefix match routes and 512,000 MAC address entries is series-wide, so the routing and switching tables of this copper access switch match those of the 25G models rather than being cut down alongside the port speeds.
At 226W typical and 242W maximum the switch sits well below the other N9300-FX3 models and pairs with 350W supplies rather than the 1100W or 1900W classes, which keeps rack power planning and PDU sizing modest for a 48-port device.
Cooling comes from NXA-SFAN-30CFM fans available as port-side intake or port-side exhaust, so the airflow direction is fixed by which fan part number is on the order rather than by a switch setting.
System memory is listed as 32 GB default and 32 GB expandable, meaning the switch ships at its memory ceiling and no later expansion is available; a control-plane sizing exercise has to fit inside that figure from day one.
Application Scenarios
Installed to aggregate console servers, IPMI ports and management interfaces across a row, where 1 Gbps copper is the required speed and the port count matters more than throughput.
Deployed in racks holding older servers whose network interfaces terminate at 1 Gbps copper, while the uplink block still reaches a modern 25G or 100G aggregation layer.
Racked where the access switch has to hold large routing and MAC tables despite terminating low-speed ports, using the 1,792,000 route and 512,000 MAC entry capacity the series provides.
Product Comparison
|
Parameter |
N9K-C9348GC-FX3 | ||
|---|---|---|---|
|
Downlink ports |
48 at 10M/100M/1 Gbps BASE-T |
48 at 100M/1/10 Gbps BASE-T |
48 at 1/10/25 Gbps SFP28 |
|
Downlink media |
Copper |
Copper |
Fiber |
|
Uplink ports |
4 at 1/10/25 Gbps SFP28 and 2 at 40/100 Gbps QSFP28 |
6 at 40/100 Gbps QSFP28 |
6 at 40/100 Gbps QSFP28 |
|
System memory |
32 GB default and expandable |
32 GB default and expandable |
16 GB default and expandable |
|
Management ports |
2 ports, 1 RJ-45 and 1 SFP |
2 ports, 1 RJ-45 and 1 SFP |
1 port, 1 RJ-45 |
|
GPS 1PPS and 10MHz timing |
Not applicable |
Not applicable |
GPS 1PPS and 10MHz input or output |
|
Cisco Nexus 2000 Fabric Extender support |
Not listed |
Not listed |
Up to 16 per switch |
|
Supply wattage classes |
350W AC, 440W DC, 350W HVAC/HVDC |
500W class AC supplies per the compatibility table |
650W AC, 930W DC, 1200W dual-input |
|
Typical and maximum power |
226W and 242W |
420W and 464W |
325W and 600W |
- Downlink speed is the first fork and it is not a small one: N9K-C9348GC-FX3 tops out at 1 Gbps on copper, N9K-C93108TC-FX3 reaches 10 Gbps on the same connector type, and N9K-C93180YC-FX3 moves to fiber at 25 Gbps, so the cable plant and the server generation decide this before any other figure.
- The uplink block separates N9K-C9348GC-FX3 from both alternatives. It is the only one of the three offering two uplink speed tiers at once through 4 SFP28 plus 2 QSFP28 ports, while the other two present a uniform block of 6 QSFP28 ports.
- Timing and fabric extension come only with the fiber model. N9K-C93180YC-FX3 carries GPS 1PPS and 10MHz input or output and supports up to 16 Cisco Nexus 2000 Series Fabric Extenders, neither of which is listed for N9K-C9348GC-FX3 or N9K-C93108TC-FX3, so a design needing precision timing or FEX aggregation is limited to that model.
- For deciding which SKU to order, fix the downlink speed and media against the installed servers first, then check whether GPS timing or fabric extenders are in scope since those eliminate two of the three, and read power last because at 226W typical N9K-C9348GC-FX3 is already the lightest option.
Selection Guide
1. One Gigabit Copper Is A Deliberate Ceiling
This switch caps its 48 downlinks at 1 Gbps, so it earns its place only where the attached devices genuinely stay at or below that speed; a rack holding servers with 10G copper interfaces is already outside its range and belongs on N9K-C93108TC-FX3 at the same connector type.
2. Two Uplink Speeds Without A Second Switch
The 4 SFP28 and 2 QSFP28 uplinks let one switch reach a 25G distribution layer and a 100G spine simultaneously, a split neither N9K-C93108TC-FX3 nor N9K-C93180YC-FX3 offers since both present six ports at a single speed class.
3. Precision Timing Rules This Model Out
GPS 1PPS and 10MHz input or output are listed as not applicable here and available only on N9K-C93180YC-FX3; a deployment that has to distribute precision time from the access switch cannot be built on this model regardless of how the port count matches.
4. Fabric Extender Aggregation Is Not On The List
Support for up to 16 Cisco Nexus 2000 Series Fabric Extenders is documented only for the 93180YC-FX3 and 93108TC-FX3P; a design that plans to fan out through FEX units from this switch has no supported path and needs a different model in the series.
5. The Fan Part Number Fixes The Airflow
NXA-SFAN-30CFM-PI and NXA-SFAN-30CFM-PE differ only in airflow direction, and the same split applies to the NXA-PAC-350W and NXA-PDC-440W supplies; a rack whose hot aisle sits behind the ports needs the intake variants throughout, and mixing directions inside one chassis is not a supported build.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Downlink speed of attached devices |
Confirm every device on the 48 copper ports operates at 1 Gbps or below. |
The downlinks are fixed at 10M/100M/1 Gbps and a faster interface will negotiate down rather than run at its rated speed. |
|
Uplink optic mix |
Confirm which of the 4 SFP28 and 2 QSFP28 uplink ports the design uses and that matching optics are on the order. |
The two uplink groups take different optic form factors, so a single optic type cannot populate both. |
|
Power supply part numbers |
Confirm NXA-PAC-350W-PE, NXA-PAC-350W-PI, NXA-PDC-440W-PE, NXA-PDC-440W-PI or NXA-PHV-350W-PE against the facility feed. |
These are the compatible supply part numbers for this switch and the input type has to match the rack. |
|
Fan part numbers and airflow |
Confirm NXA-SFAN-30CFM-PI or NXA-SFAN-30CFM-PE matches the rack airflow direction, and that supplies use the same direction. |
Airflow direction is set by the part number, and a mismatch recirculates hot air through the chassis. |
|
Timing requirement |
Confirm no precision timing distribution is expected from this switch. |
GPS 1PPS and 10MHz are listed as not applicable for this model. |
|
Fabric extender plan |
Confirm no Cisco Nexus 2000 Series Fabric Extenders are planned behind this switch. |
FEX support is documented for other models in the series but not this one. |
|
Control-plane memory sizing |
Confirm the deployment fits inside 32 GB of system memory. |
The switch ships at 32 GB with 32 GB listed as the expandable figure, so no later memory growth is available. |
Optional Add-ons
|
Model |
Description |
|---|---|
|
NXA-PAC-350W-PI |
350W AC power supply, port-side intake |
|
NXA-PAC-350W-PE |
350W AC power supply, port-side exhaust |
|
NXA-PDC-440W-PI |
440W DC power supply, port-side intake |
|
NXA-PDC-440W-PE |
440W DC power supply, port-side exhaust |
|
NXA-PHV-350W-PE |
350W high-voltage AC and DC power supply, port-side exhaust |
|
NXA-SFAN-30CFM-PI |
Nexus single fan, 30CFM, port-side intake airflow |
|
NXA-SFAN-30CFM-PE |
Nexus single fan, 30CFM, port-side exhaust airflow |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | N9K-C9348GC-FX3 | Cisco model name | Cisco Nexus 9348GC-FX3 Switch, N9300-FX3 Series |
| Downlink ports | 48 ports at 10M/100M/1 Gbps BASE-T | Uplink ports | 4 ports at 1/10/25 Gbps SFP28 and 2 ports at 40/100 Gbps QSFP28 |
| Uplink layout within the series | Only this model and the Nexus 9348GC-FX3PH carry a mixed SFP28 and QSFP28 uplink block; the other three models present 6 QSFP28 uplinks | CPU | 4 cores |
| System memory | 32 GB default and 32 GB expandable | SSD drive | 128 GB |
| System buffer | 40 MB | Management ports | 2 ports, 1 RJ-45 and 1 SFP |
| USB ports | 1 | GPS timing | 1PPS and 10MHz input or output are listed as not applicable for this model |
| Maximum IPv4 LPM routes | 1,792,000 | Maximum IPv4 host entries | 1,792,000 |
| Maximum IPv6 LPM routes | 896,000 | Maximum IPv6 host entries | 1,792,000 |
| Maximum MAC address entries | 512,000 | Maximum multicast routes | 128,000 |
| IGMP snooping groups | 32,000 | Fabric extender support | Up to 16 Cisco Nexus 2000 Series Fabric Extenders is listed for the 93180YC-FX3 and 93108TC-FX3P only, not for this model |
| Power supply configuration | 350W AC in port-side intake and port-side exhaust, 440W DC in port-side intake and port-side exhaust, and 350W HVAC/HVDC dual direction | Compatible power supply part numbers | NXA-PAC-350W-PE, NXA-PAC-350W-PI, NXA-PDC-440W-PE, NXA-PDC-440W-PI and NXA-PHV-350W-PE |
| Typical power | 226W | Maximum power | 242W |
| Input voltage (AC) | 100 to 240V | Input voltage (high-voltage AC) | 200 to 277V |
| Input voltage (DC) | -48 to -60V | Input voltage (high-voltage DC) | -240 to -380V |
| Compatible fan part numbers | NXA-SFAN-30CFM-PI and NXA-SFAN-30CFM-PE |
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