legend

| Legend
### System-Level LEDs
LED | Description
SYSTEM | The SYST LED, referred to as the SYSTEM LED, shows the status of the switch (system). This LED is managed through the Cisco IOS software.
|  | Off (dark) | Switch is not powered on.
| Solid green | Switch is healthy.
| Blinking green | Switch is running power-on self-test (POST).
| Solid amber | Switch is faulty, is rebooting, or is in recovery.
STCK | The STCK LED, referred to as the STACK LED, shows whether the port LEDs are in Stack mode. To display the information of another switch in the stack, choose a stack member number from the Stack list.
|  | Off (dark) | Stack mode for the port LEDs is off.
| Solid green | Stack mode for the port LEDs is on.
MSTR | The MSTR LED, referred to as the MASTER LED, shows whether the switch is the stack master or is a standalone switch. To display the information of another switch in the stack, choose a stack member number from the Stack list.
|  | Off (dark) | The switch is not the stack master.
| Solid green | The switch is the stack master or is a standalone switch.
| Solid amber | An error occurred during stack master election or a stack error exists.
MMBR |
|  | Off (dark) | The MMBR LED, referred to as the MEMBER LED, remains "off" in the Front Panel view of the device manager. Either Select the Stack mode from the View list. See also the description of the Stack mode in Port States. See the hardware installation guide for information on the behavior of this LED on the physical switch.
UID | The UID (unit identification) LED is used to conveniently identify the switch. This LED is managed through the chassis server management software.
|  | Off (dark) | Switch is not identified by the administrator.
| Solid green | Switch is identified by the administrator.
| The LED, referred to as the HEALTH LED, shows the status of the switch. This LED is managed through the chassis server management software.
|  | Solid green | Switch is healthy.
| Solid amber | Switch is faulty.
Back to the top ### Port States
Ethernet Management Port LED | This LED shows the status of the Ethernet Management (FA0) port.
|  | Off (dark) | No link is present on the Ethernet Management (FA0) port.
| Solid green | Link is present between the Ethernet Management (FA0) port and the management station.
By default, the port LEDs show port status. To display the port duplex, the port speed, and switch stack information from the port LEDs, you must use the View list from the device manager or the Mode button on the physical switch.
LED Mode | Description
Status | In this mode, the port LEDs show port status.
|  | Off (dark) | No link.
| Solid green | Link is up, but there is no activity on the link.
| Blinking green | Link has activity.
| Solid brown | Port is administratively disabled.
| Yellow | Port is error disabled.
| Blinking green and amber | Link is faulty.
| Solid amber | Port is faulty, is disabled due to an error condition, or is in an STP-blocked state.
Duplex | In this mode, the port LEDs show the duplex mode (full duplex or half duplex) of the ports. Note: The 10/100/1000 ports operate only in full-duplex mode.
|  | Off (dark) | No link.
| Solid light blue | Port is in half-duplex mode.
| Solid green | Port is in full-duplex mode.
Speed | In this mode, the port LEDs show the operating speed (10, 100, or 1000 Mb/s, or 10 Gb/s) of the ports.
|  | Off (dark) | No link.
| Solid light blue | 10 Mb/s.
| Solid green | 100 Mb/s.
| Blinking green | 1000 Mb/s (1 Gb/s).
| Fast blinking green | 10 Gb/s.
Stack | In this mode, the port LEDs show the switch stack status.
|  | The STACK LED is off (dark) | Stack mode is off.
| Blinking green | Port number means stack member number.
| Solid green | Stack cable is connected.
| Solid amber | Stack cable is not connected.
Back to the top ### Port Types
| RJ-45 port
| Internal port
| Stack port
| Small form-factor pluggable (SFP) module slot (empty)
| Cisco Dual SFP X2 converter module (empty)
| Fiber-optic SFP module ports
| 1000BASE-T SFP module port
| 10-Gigabit X2 module slot (empty)
| X2 transceiver module ports (for 10GBASE-ER, -LR, -SR, or -LX4)
| X2 transceiver module port (for 10GBase-CX4)
Back to the top ### Color-Wavelength Representation in CWDM Module Ports Note: The circles in the icon for a coarse wave length-division multiplexer (CWDM) module port can be any of eight colors, each denoting a different wave length in nanometers (nm). This table shows the wave length that is denoted by each color. To see the wave length of a CWDM module port, point to its icon.
Color | Wave Length
| Gray | 1470 nm
| Violet | 1490 nm
| Blue | 1510 nm
| Green | 1530 nm
| Yellow | 1550 nm
| Orange | 1570 nm
| Red | 1590 nm
| Brown | 1610 nm
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