Juniper Networks 8 manual LED Identification, Redundant

Troubleshooting

familiarize yourself with LED activity so that you can easily detect and correct a module-related problem with minimal or no system downtime.

LED Identification

The system’s modules have two sets of status LEDs. The top set indicates overall router and module status. The bottom set indicates module-specific status, such as port status (line modules) or fan status (SRP module).

The number next to the port status LED on a line module corresponds to the number of the port on the I/O module. Some line modules have more port status LEDs than the number of ports on the I/O module. In these cases, only the LEDs for the corresponding ports on the I/O modules are active.

For example, an OCx/STMx line module can pair with either an OC3-4 or an OC12/STM4 I/O module. Consequently, the line module has four port status LEDs for OC3/STM1 operation. However, only the top set of port status LEDs is active during OC12/STM4 operation.

Table 11 presents the functions of the module LEDs and port status LEDs.

Table 11: LED Identification and Activity Descriptions

LED Location	LED Label	LED Indicator	LED Color	OFF to ON	ON to OFF
All modules	OK	Module status	Green	Self-test passed	Failure detected
	FAIL	Module status	Red	Failure detected	Diagnostic test
					running
	ONLINE	Module status	Green	Module online	Module offline
All modules	REDUNDANT	Redundancy	Green	See “Redundancy Status” on page 113.
		NOTE: The REDUNDANT LED on the cOCx/STMx, FE-8, GE/FE, HSSI, OCx/STMx,
		and X.21/V.35 line modules is nonfunctional.
SRP module	POWER A OK	Power	Green	Power online on	Power off
				source A
	POWER B OK	Power	Green	Power online on	Power off
				source B
	FAN OK	Fan	Green	Fan online	Critical fan failure
	FAN FAIL	Fan	Red	Critical fan failure	Fan online
		NOTE: When the LED alternates between OK and FAIL at 10-second intervals, a
		noncritical fan failure exists.
	LINK	Ethernet	Green	Ethernet link up	Ethernet link
					down
	ACTIVITY	Ethernet	Green	Blinks when	No Ethernet traffic
				Ethernet traffic	on link
				on link

Understanding Status LEDs to Troubleshoot 105