S4100–ON Series S4128F-ON, S4148F-ON, and S4148FE Installation Guide November 2017

LED behavior

The following S4100–ON Series switch LED behavior displays during open networking installation environment (ONIE) operations:

Figure 1. S4128F-ON I/O-side LEDs Illustration of S4128F-ON I/O-side LEDs

Figure 2. S4148F-ON and S4148FE-ON I/O-side LEDs Illustration of the S4148F-ON and S4148FE-ON I/O-side LEDs.

Figure 3. S4100-ON Series PSU-side LEDs Illustration of the S4100-ON Series PSU-side LEDs.

Table 1. S4100–ON Series LED behavior . Table listing the S4100-ON LED behavior.
LED	Description
System Status/Health LED	Solid green—Normal operation Blinking green—Booting Solid yellow (amber)—Critical system error Blinking yellow—Noncritical system error, fan failure, or power supply failure
Power LED	Off—No power Solid green—Normal operation Solid yellow—POST is in process Blinking yellow—Power Supply failure
Master LED	Off—Switch is in Stacking Slave mode Solid green—Switch is in Stacking Master or Standalone mode
FAN LED	Off—No power Solid green—Normal operation; fan powered and running at the expected RPM Solid yellow—Fan failed—including incompatible airflow direction when you insert the PSU or fan trays with differing airflows
PSU LED	Off—No power Solid green—Normal operation Solid yellow—Power supply critical event causing a shutdown. Blinking yellow—PSU warning event; power continues to operate Blinking green, 1.0Hz—Standby mode Blinking green, 0.5Hz—Ac power cord unplugged
Locator LED/System Beacon	Off—Locator function is disabled Blinking blue—Locator function is enabled
7-Segment LED for stacking	Off—No power Solid green—Hex digit representing the stack unit ID
RJ-45 Ethernet LED	Off—no link and no activity detected On—Activity on the port Solid yellow—10MHz activity Solid green—100MHz activiity Blinking green—1GHz activity

Table 2. System management Ethernet port LEDs. Table listing the system management port LED behavior.
LED	Description
Link LED	Off—No link Solid green—Link operating at a maximum speed—autonegotiated/forced or 1G port Solid yellow—Link operating at a lower speed—autonegotiated/forced or 10/100M port
Activity LED	Off—No link Flashing green—Port activity

Table 3. SFP+ and unified SFP+ port LEDs. Table listing the SFP+ and unified SFP+ port LED behavior.
LED	Description
Link LED	Off—No link Solid green—Link operating at maximum speed—10G port Solid yellow—Link operating at a lower speed—1G port Flashing yellow, 1 second on/off—Port beacon
Activity LED	Off—No link Flashing green—Port activity

NOTE: There are four LEDs for each QSFP+, QSFP28, and unified QSFP28 port. For each port, 100GbE or 40GbE uses only one LED, 2x50GbE uses two LEDs, and 4x25GbE or 4x10GbE uses all four LEDs.

Table 4. QSFP28 and unified QSFP28 port LEDs . Table listing the QSFP28 and unified QSFP28 port LED behavior.
LED	Description
Link/Activity LED	Off—No link Solid green—Link operating at maximum speed—100G for QSFP28 port Flashing green—Link activity operating at maximum speed—100G port Solid yellow—Link operating at a lower speed—40G or 10G port Flashing yellow—Port activity at a lower speed—40G or 10G port Flashing yellow, 1 second on/off—Port beacon

Table 5. QSFP28 and unified QSFP28 port LEDs: 4x25G or 4x10G mode . Table listing the QSFP28 and unified QSFP28 port LED 2x25GbE or 4x10GbE behavior.
LED	Description
Link/Activity LED	Off—No link Solid green—Link operating at maximum speed—4x25G port Flashing green—Link activity operating at maximum speed—4x25G port Solid yellow—Link operating at a lower speed—4x10G port Flashing yellow—Port activity at a lower speed—4x10G port Flashing yellow, 1 second on/off—Port beacon

Table 6. QSFP28 and unified QSFP28 port LEDs: 2x50G mode . Table listing the QSFP28 and unified QSFP28 port LED: 2x50GbE mode behavior.
LED	Description
Link/Activity LED	Off—No link Solid yellow—Link operating at a lower speed—2x50G port Flashing yellow—Link activity at a lower speed—2x50G port Flashing yellow, 1 second on/off—Port beacon

Table 7. QSFP+ port LEDs. Table listing the QSFP+ port LED behavior.
LED	Description
Link/Activity LED	Off—No link Solid green—Link operating at maximum speed—40G port Flashing green—Link activity operating at maximum speed—40G port Solid yellow—Link operating at a lower speed—40G port Flashing yellow—Link activity at a lower speed—40G port Flashing yellow, 1 second on/off—Port beacon

Table 8. QSFP+ port LEDs: 4x10G/1G mode. Table listing the QSFP+ port LED 4x10GbE/1GbE mode behavior.
LED	Description
Link/Activity LED—4x10G mode	Off—No link Solid green—Link operating at maximum speed—10G port Flashing green—Link activity operating at maximum speed—10G port Solid yellow—Link operating at a lower speed—1G port Flashing yellow—Link activity at a lower speed—1G port Flashing yellow, 1 second on/off—Port beacon