5420 Series Installation Guide

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. System Status LEDs
LED	Color/State	Port State
SYStem status LED (Legacy MGMT function) Note: The system status LED is solid green to indicate normal operation when the switch is running Fabric Engine.	Slow flashing 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	Green	Power On
	Off	Power off and no power attached
	Blinking amber	Power supply failures
Speed status (SPD), Stacking status (STK)	SPD solid green	Speed mode
	STK solid green	Stacking mode
	All off	Normal mode
Fan status for 5420F	Green	Normal operation
Fan status for 5420F	Blinking amber	Fan failure
Fan module status for 5420M	Green	Normal operation
	Blinking amber	Fan module failure
	Off	Fan module not present
Bluetooth Status LED (BT)	Blinking green	Bluetooth pairing in progress
	Green	Bluetooth connected
	Off	Bluetooth not 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. 5420 Series Mode and System Status LEDs shows the two alternate mode LEDs: SPD and STK.

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)
Color/State	Meaning
Green	Link is OK; port is not powered
Amber	Link is OK; port is powered; no traffic
Blinking green	Link is OK and transmitting packets; port is not powered
Blinking amber	Link is OK and transmitting packets; port is powered
Slow blinking amber	Indicates PoE is providing power. The link is either down or administratively disabled.
Alternating amber and green	Port has a power fault
Off	Indicates PoE is not providing power. The link is either down or administratively disabled.

Port LEDs in SPD Mode

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

There are two LEDs per SFP-DD port on 5420 models. When an SFP-DD port is used for Ethernet and stacking is disabled, each SFP-DD port can be used as either a single SFP+ port or two SFP+ ports if an SFP-DD transceiver is used on 5420M models. When the SFP-DD port is used for as a single SFP+ port, the first LED represents link and traffic, while the second LED is not operational. When the SFP-dd port is used as two SFP+ ports, the first LED represents link and traffic for the first port, and the second LED represents link and traffic for the second port. 5420F models are limited to one 10Gbps port per SFP-DD port in Ethernet mode with stacking disabled. The second SFP+ port is not available and the second LED is not operational.

In stack mode, each SFP-DD port can be used as one 20Gbps SFP+ port, or one 10Gbps SFP+ port, depending on the stack speed and optic used. The first LED represents the link state and traffic of the stack port with solid or blinking green. The second SFP+ port is not available and the second LED is not operational.

Color and blink pattern indicate speeds, as referenced by the following table:

Table 3. Port LEDs in SPD Mode
Color/State	Speed
Green	10Mbps
Blinking green	100Mbps
Amber	1000Mbps
Slow blinking amber	2.5Gbps
Slow blinking green	10Gbps
Fast blinking green	25Gbps
Fast blinking green	40/50Gbps

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
Color/State	Speed
Green	The slot corresponding to the port number of the LED is present.
Blinking green	This slot has a 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
Right side LED		State
Link	Green	Link up
Link	Off	No link up or port disabled
Left side LED		State
Act	Blinking green	Packet transmitting or receiving
Act	Off	No packet transmitting or receiving

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.