Network Router User Manual

For information about using the CLI to display details about alarms generated by
interfaces and hardware components, see “Hardware and Interface Alarm
Messages” on page 80.
For information about using the CLI to troubleshoot the JUNOS Internet software,
see the appropriate JUNOS Internet software configuration guide.
LEDs
The LEDs described in the following sections indicate the basic status of hardware
components.
LEDs on the HCM
The HCM provides status and troubleshooting information at a glance. It is located
on the front of the chassis below the FPC card cage, as shown in Figure 1. The LEDs
on the HCM include two alarm LEDs. The circular red alarm LED at the upper right
of the craft interface indicates a critical condition that can result in a system shutdown.
The triangular yellow alarm below it indicates a less severe condition that requires
monitoring or maintenance. Both alarms can occur simultaneously. For more
information about the alarm LEDs, see “Alarm LEDs” on page 18. For more
information about the causes of alarms, see “Hardware and Interface Alarm
Messages” on page 80.
LEDs on Hardware Components
LEDs on the faceplates of the following hardware components report their status:
■
PIC—Most PICs have an LED labeled STATUS on their faceplate. Some PICs have
additional LEDs, often one per port. The meaning of the LED states differs for
various PICs. For more information, see the M10i Internet Router PIC Guide.
■
Power supply—A green LED labeled OUTPUT OK reports the status of the power
supply. For more information, see “Power Supply LED” on page 22.
Hardware and Interface Alarm Messages
When the Routing Engine detects an alarm condition, it lights the red or yellow alarm
LED on the craft interface as appropriate. To view a more detailed description of the
alarm cause, issue the show chassis alarms CLI command:
user@host> show chassis alarms
There are two classes of alarm messages:
■ Chassis alarms—Indicate a problem with a chassis component such as the cooling
system or power supplies, as described in Table 16 on page 81.
■ Interface alarms—Indicate a problem with a specific network interface, as
described in Table 17 on page 82.
80 ■ Overview of Troubleshooting Resources
M10i Internet Router Hardware Guide