EX4100 and EX4100-F Chassis
Chassis Status LEDs on EX4100 and EX4100-F Switches
EX4100 and EX4100-F switches have four chassis status LEDs (labeled SYS, ALM, MST, and CLD) on the rightside of the front panel .

1 —
Chassis status LEDs
|
Table 1 describes the chassis status LEDs labeled
SYS, ALM, and
MST on an EX4100 and EX4100-F switch. The table also
describes their colors and states and the status each LED indicates. You can view
the colors of the LEDs remotely through the CLI by issuing the show chassis
led
operational mode command. All LEDs can be lit simultaneously.
LED Label |
Color |
State and Description |
---|---|---|
SYS |
Green |
|
Unlit |
The switch is powered off or is halted. |
|
ALM |
Red |
A major hardware fault—such as a temperature alarm or a power failure alarm—occurred, and the switch is halted. A major alarm indicates a critical error condition that requires immediate attention (see Chassis Component Alarm Conditions on EX4100 and EX4100-F Switches). |
Amber |
A minor alarm—such as a software or a hardware error—occurred. Power off the switch and then power it back on. Monitor the switch to see whether it is working properly. A minor alarm indicates a non-critical condition that requires monitoring or maintenance. A minor alarm that is left unchecked might cause interruption in service or performance degradation. |
|
Unlit |
No alarm is in effect, or the switch is halted. |
|
MST |
Green |
In a standalone switch:
|
In a Virtual Chassis configuration:
|
Table 2 describes the cloud LED (labeled CLD) on an EX4100 and EX4100-F switch. The table also describes the colors on the switch and the status that the colors indicate. Cloud LED blinking patterns identify the cloud connection status of the switch. There is a distinct pause between blinking patterns to distinguish them. For example, a green color blink of the cloud LED followed immediately by a yellow color blink, followed by a distinct pause, and then the pattern repeating, signifies that the switch is connecting to the cloud.
Colors |
Status |
---|---|
|
The switch is connecting to the cloud. |
|
The DHCP server has not allotted an IP address to the switch, or no IP address is configured on the switch. |
|
The DHCP server has not allotted a gateway IP address to the switch, or no gateway IP address is configured on the switch. |
|
The gateway IP address is not reachable. |
|
The switch cannot find a DNS server. |
|
The DNS server does not respond. |
|
The response from the DNS server is blank. |
|
The connection to the phone-home server (PHS) or the network management server is not active or timed out. |
|
The PHS is active, but it does not respond. |
|
The switch is unable to connect to the cloud because it is unable to authenticate the certificate from the cloud. |
|
The switch is unable to connect to the cloud because the cloud authentication certificate is invalid. |
|
The switch information is not added to the PHS. |
|
The switch is unable to fetch the configuration file from the cloud. |
|
The switch is unable to apply the configuration file fetched from the cloud. |
|
The switch is unable to save the boot configuration file. |
|
Junos OS is being upgraded on the switch. |
|
Junos OS is upgraded successfully on the switch. |
|
Upgrade of Junos OS on the switch failed. |
For Virtual Chassis deployments managed from the cloud, the CLD LED on individual Virtual Chassis members will reflect the state of the Master, except when a software download is in progress. When a software download is in progress, the CLD LED on a Virtual Chassis member will display the Junos OS upgrading LED pattern and color.
LEDs on the Management Port on EX4100 and EX4100-F Switches
The management port, labeled MGMT, on the rear panel of EX4100 and EX4100-F switches has two LEDs that indicate link activity and port status (see Figure 2).

1 —
Link activity LED
| 2 —
Status LED
|

1 —
Link activity LED
| 2 —
Status LED
|
Table 3 describes the LEDs.
LED |
Color |
State and Description |
---|---|---|
Link activity |
Green |
|
Status |
Green |
Indicates the speed:
|
LEDs on the RJ-45 Network Ports, Virtual Chassis Ports, and Uplink Ports on EX4100 and EX4100-F Switches
The RJ-45 network ports, SFP+ uplink ports, and SFP+/SFP28 Virtual Chassis Ports on EX4100 and EX4100-F switches have LEDs that show the link activity and port status.
LEDs on the Network Ports
The figures in this section show and describe the LEDs on the following ports:
-
Figure 4 shows the LEDs on the RJ-45 network ports on EX4100 and EX4100-F switches.
-
Figure 5 and Figure 6 show the LEDs on the SFP+ uplink ports and LEDs on the multigigabit BASE-T RJ-45 uplink ports on the EX4100-F-12P and EX4100-F-12T Switches.
-
Figure 7 and Figure 8 shows the LEDs on the SFP+/SFP28 Virtual Chassis Ports and LEDs on the SFP+ Virtual Chassis ports on EX4100-F-12P and EX4100-F-12T Switches.
-
Table 4 describes the link activity LED state and description on the RJ-45 ports, SFP+ uplink ports/multigigabit BASE-T RJ-45 uplink ports, and SFP+/SFP28 Virtual Chassis Ports.

1 —
Link activity LED
| 2 —
Status LED
|

1 —
Link activity LED
| 2 —
Status LED
|

1 —
Link activity LED
| 2 —
Status LED
|

1 —
Link activity LED
| 2 —
Status LED
|

1 —
Link activity LED
| 2 —
Status LED
|
Link Activity LED Color |
Link Status LED State and Description |
---|---|
Green |
|
EX4100 and EX4100-F switches have network port mode LEDs (labeled SPD, DX, EN, and POE) on the right side of the front panel (see Figure 9). These LEDs indicate the status of the network ports. Use the mode button on the right side of the front panel to toggle the status LEDs. You toggle the status LEDs to show the different port parameters for the network ports. The LED that is lit indicates the port parameter. Table 5 describes the status LEDs.
The LED labeled PoE is not available on switch models with network ports that do not provide PoE.

1 —
Port Mode LEDs
|
LED |
Color |
State and Description |
---|---|---|
SPD |
Green |
Indicates the speed. The speed indicators are as follows:
|
Amber |
|
|
Blue |
|
|
DX |
Green |
Indicates the duplex mode. The status indicators are as follows:
|
EN |
Green |
Indicates the administrative status. The status indicators are as follows:
|
POE |
Green |
Indicates the PoE mode. The status indicators are as follows:
|