System Status LEDs

System status LEDs are located on the panel front of the switch. The following table describes the colors and the states for the LEDs.

Table 1. 5720 Series Port LEDs
LED	Color/State	Port State
SYStem status LED Note: The system status LED is solid green to indicate normal operation when the switch is running Fabric Engine. (Legacy MGMT function)	Slow blinking green	POST Passed, normal operation, blinks on standalone switch, stack primary, and backup nodes in a stack; off for standby nodes in a stack
	Blinking green	POST in progress
	Blinking amber	POST failed or overheat
PSU status LEDs (P1/P2)	Solid green	Power On
	Off	Power off and no power attached
	Blinking amber	Power supply failures
Fan status LEDS (F1/F2/F3/F4)	Solid green	Normal operation
Fan status LEDS (F1/F2/F3/F4)	Blinking amber	Fan failure
Bluetooth Status LED (BT)	Blinking green	Bluetooth pairing in progress
Bluetooth Status LED (BT)	Solid green	Bluetooth connected
Locator LED (LOC)	Blinking blue	Locator function

Port LEDs can display in three different modes: SYS (the default mode), SPD (speed) and STK (stacking). The Mode button cycles through the three display modes. In the default SYS mode, SPD and STK are off. The port LEDs enter SPD display mode, indicated by the SPD LED, after pressing the Mode button one time. SPD mode helps to determine the operational speed of a port. The port LEDs enter the STK display mode, indicated by the STK LED, after pressing the Mode button a second time. STK mode is used to indicate slot presence and slot number through the first eight port LEDs. SPD and STK display modes expire after 30 seconds, and the display mode reverts back to the default SYS mode. A long press of the Mode button when in any mode other than STK mode initiates Bluetooth pairing. 5720 Series Mode and System Status LEDs shows the two alternate mode LEDs: SPD and STK.

The Mode button also supports the instant stacking feature. To instantly stack switches, first ensure that the SPD/STK LED is on STK by pressing the Mode button until the LED is green. Press and hold the Mode button for at least five seconds, then release the Mode button after five seconds. The front panel port LEDs on the primary node flash in an alternating pattern followed by a delayed reboot of all of the switches. The LEDs flash for approximately 15 seconds prior to the reboot. After the reboot completes, the switches are stacked.

Note

Front-panel PoE ports use Amber to indicate PoE states.

Port LEDs in Default (SYS) Mode

In the default SYS mode, SPD and STK are OFF. Port status displays behavior for link, traffic, and PoE as described in the following table:

Table 2. Port LEDs in SYS Mode (default)

Solid green	Link is OK; port is not PoE powered
Solid amber	Link is OK; port is PoE powered; no traffic
Blinking green	Link is OK and transmitting packets; port is not PoE powered
Blinking amber	Link is OK and transmitting packets; port is PoE powered
Slow blinking amber	No link, or disabled port; port is PoE powered
Alternating amber and green	Port has a power fault
Off	Port is not PoE powered, has no link, or is disabled

Port LEDs in SPD Mode

SPD mode helps to determine the operational speed of a port.

RJ45 and SFP ports have a single LED per port. QSFP ports have four LEDs because QSFP ports can be divided into four different channels, each of which can indicate link and activity independent of the other channels. When a QSFP port is divided, each LED indicates the rate of an individual channel. When a QSFP port is used as single port, all of the channel LEDs indicate the rate of the single port. Color and blink pattern indicate speeds, as referenced by the following table:

Table 3. Port LEDs in SPD Mode
Color/State	Speed
Fast blinking green	100Mbps
Solid green	1Gbps
Slow blinking amber	2.5Gbps
Fast blinking amber	5Gbps
Slow blinking green	10Gbps
Fast blinking green	25Gbps
Fast blinking green	40Gbps
Fast blinking green	50Gbps
Fast blinking green	100Gbps

Port LEDs in STK Mode

STK mode indicates slot presence and slot number through the first eight port LEDs, as referenced by the following table.

Table 4. Port LEDs in STK Mode
Port 1-8 Color/State	Speed
Solid green	Slot corresponding to the port number of the LED is present
Blinking green	Slot number corresponding to the port number of the blinking LED

Management Port LEDs

The management port uses two LEDs to indicate port activity and link status, as referenced by the following table

Table 5. Management Port LEDs
LED	State	Description
Link/Speed	Off	Operating at 10Mbps
	Solid amber	Operating at 100Mbps
	Solid green	Operating at 1Gbps
Act	Off	No link
	Solid green	Link is OK; no traffic
	Blinking green	Link is OK and transmitting packets

Locator LED

The blue LED labeled LOC on the front panel is the locator LED, which is controlled by using the CLI commands

[enable | disable] led locator.