The systems support the following interfaces:
- 10/100/1000Mb Ethernet management interface (RJ45)
- USB port (uUSB connector)
- RS232 Console port (RJ45)
- RJ45 management interface(s)
- Reset button
- Status and Port LEDs
In order to review the full configuration options matrix, refer to Management Interfaces, PSUs and Fans.
Data Interfaces
The data interfaces use QSFP28/56 connectors. The full list of interfaces per system is provided in Speed and Switching Capabilities.
As detailed in the following table, for additional data interfaces, each QSFP28/56 port can be connected with a QSFP28/56 cable or connector through NVIDIA QSFP to SFP (Dynamix QSA™) adapters, hybrid or split cables*.
| Model Family | Ports | Maximum Speed |
|---|---|---|
| SN3420 | 12 | 100GbE |
| 24 | 50GbE | |
| 12 | 40GbE | |
| 48+48 | 25GbE | |
| 10GbE | ||
| 1GbE | ||
| SN3700C | 32 | 100GbE |
| 40GbE | ||
| 64 | 50GbE | |
| 128 | 25GbE | |
| 10GbE | ||
1GbE | ||
| SN3700 | 32 | 200GbE |
| 40GbE | ||
| 64 | 100GbE | |
| 128 | 50GbE | |
| 25GbE | ||
| 10Gbe | ||
| 1GbE | ||
| SN3750-SX | 32 | 200GbE |
| 40GbE | ||
| 64 | 100GbE | |
| 128 | 50GbE | |
| 25GbE | ||
| 10GbE | ||
| 1GbE |
*In the SN3700 systems, when interconnecting Switch to Switch and Switch to NIC in 50GbE, 100GbE and 200GbE based PAM4 speeds, the supported length of PAM4 passive copper and breakout cables is up to 2.5m.
The systems offer several high-power ports for optical transceivers that require such support. The following table specifies each system's ports max power capabilities:
High Power Transceivers Support
| Model Family | Ports | Maximum High Power Support |
|---|---|---|
| SN3420 | 1-6 | 2.5W |
| 7-48 | 1.5W | |
| 49-52, 54, 56, 58, 60 | 3.5W | |
| 53, 55, 57, 59 | 5W | |
| SN3700C | 1, 2, 31, 32 | Power class 7 (5W) |
| 3-30 | Power class 4 (3.5W) | |
| SN3700 | 1-32 | Power class 7 (5W) |
| 1, 2, 21, 22 | Power class 8 (6.5W) | |
| SN3750-SX | TBD | TBD |
Speed
Ethernet speed must be set manually. The system’s ports can be manually configured to run at speeds ranging from 1GbE/10GbE to 100GbE/200GbE/400GbE (for more details, see Specifications). To change the port speed configuration, use the command “speed” under interface configuration mode. Refer to the NVIDIA Onyx (MLNX-OS) User Manual for instructions on port speed re-configuration.
RS232 (Console)
The RS232 serial “Console” port is labeled 
.
The “Console” port is an RS232 serial port on the front side of the chassis that is used for initial configuration and debugging. Upon first installation of the system, you need to connect a PC to this interface and configure network parameters for remote connections. Refer to Configuring Network Attributes Using NVIDIA Onyx (MLNX-OS) to view the full procedure.
Management
The RJ45 Ethernet “MGT” port is labeled 
.
The RJ45 Ethernet “MGT” port provides access for remote management. It is configured with auto-negotiation capabilities by default (100MbE to 1000GbE). Its network attributes (such as IP address) must be pre-configured via the RS232 serial console port or by DHCP before use. Refer to Configuring Network Attributes Using NVIDIA Onyx (MLNX-OS) to view the full procedure.
USB
The SN3700/SN3750-SX systems' USB interface is USB 2.0 compliant, and the SN3420 systems' USB interface is USB 3.0 compliant. This interface can be used by NVIDIA Onyx software to connect to an external disk for software upgrade or file management. The connector comes in a standard micro USB shape.
To view the full matrix of the USB configuration options, refer to Management Interfaces, PSUs and Fans.
Reset Button
The reset button is located on the front side of the system. This reset button requires a tool to be pressed.
When using an NVIDIA Onyx (MLNX-OS) based system, keeping the reset button pressed for more than 15 seconds will reset the system and the “admin” password, this should allow you to login without a password and set a new password for the “admin” user.
For Cumulus Linux password reset instructions, please refer to the Single User Mode - Boot Recovery section in the Cumulus Linux User Guide.
Status and Port LEDs
See LED Notifications.
