LED Notifications

The system’s LEDs are an important tool for hardware event notification and troubleshooting.

LED Symbols

Symbol	Name	Description	Normal Conditions
	System Status LED	Shows the health of the system.	Green/Flashing green when booting
	Fan Status LED	Shows the health of the fans.	Green
	Power Supply Units LEDs	Shows the health of the power supply units.	Green
	Unit Identifier LED	Lights up on command through the CLI.	Off or blue when identifying a port

The LED in the red oval shows the system’s status.

System Status LED Assignments

Fan Status LED - Front and Rear Sides

	Both of these LEDs in the red ovals show the fans’ status.

Fan Status Front LED Assignments

Fan Status Rear LED Assignments (One LED per Fan)

The LED in the red oval shows the power supply status.

Rear Side Panel

There are two power supply inlets in the system (for redundancy). The system can operate with only one power supply connected. Each power supply unit has two single color LEDs on the right side of the unit, that indicate the status of the unit.

The primary power supply (PS) unit is located on the left side, and the secondary unit is located on the right side.

Power Supply Unit Status Front LED Assignments

Power Supply Unit Status Rear LED Assignments

The UID LED is a debug feature, that the user can use to find a particular system within a cluster by turning on the UID blue LED.

To activate the UID LED on a switch system, run:

            

            
switch (config) # led MGMT uid on
        

To verify the LED status, run:

            

            
switch (config) # show leds
Module LED Status
--------------------------------------------------------------------------
MGMT UID Blues
        

To deactivate the UID LED on a switch system, run:

            

            
switch (config) # led MGMT uid off
        

SN3700/SN3700C/SN3750-SX Port LEDs

Each QSFP module can be used as one 4X port/two 2X ports/four 1X ports. Each QSFP has one dedicated bi-color LED. In order to provide link information for more than one port by using one LED, LED splitting control button is available. You may use the button to select between 5 indication states. By pressing on the button, the next indication state will be selected in a cyclic manner. The current state can be identified by the LED splitting state indication LEDs. The states and their indications are detailed in the below table.

SN3700/SN3700C/SN3750-SX LED Splitting Options

State	State Indication LEDs [/1 /2 /3 /4]	QSFP Module LED Indication	Comments
0		Indication for all link types, as described in Port LEDs Indications (State 0)	See details in Port LEDs Indications (State 0)
1		LED indication for the following link types: 4X/2XA/1XA	See details in Port LEDs Indications (States 1-4). Only one of the link types can be up at a given time.
2		LED indication for the following link types: 4X/2XB/1XB
3		LED indication for the following link types: 4X/1XC
4		LED indication for the following link types: 4X/1XD

The port LED behavior indicates the port state, as follows:

SN3700/SN3700C/SN3750-SX Port LEDs Indications

SN3420 Port LEDs

SN3420:

SN3420 LED Splitting Options

In the SN3420 systems, the state of the splittable ports (49-60) is indicated by the port LEDs in the following manner:

State	State Indication LEDs	QSFP Module LED Indication
1		LED indication for 4X QSFP link
2		LED indication for 2X QSFP link
3		LED indication for 1X QSFP link

SN3420 Port LED Indications