For more information about cooling-related alarms, see “Hardware and Interface Alarm
Messages” on page 200.
To troubleshoot the fans:
• If the red alarm LED on the craft interface lights, use the show chassis alarms command
to determine the source of the problem. The display reports the number of alarm
conditions and the source of each alarm. For a list of messages, see “Hardware and
Interface Alarm Messages” on page 200.
• Issue the show chassis alarms command for more information about the source of an
alarm condition.
• If both power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down. See “Troubleshooting the M7i Power
System When the LEDs on All M7i Power Supplies Are Blinking or Off” on page 206.
• If the fan tray has failed, it must be replaced for the router to operate normally. For
replacement instructions, see “Replacing the M7i Fan Tray” on page 137. For instructions
about returning a faulty component to Juniper Networks, see “Contacting Customer
Support” on page 211.
Related
Documentation
M7i Power System Description on page 59•
• M7i Router Power Requirements on page 79
• Maintaining the M7i Power Supplies on page 194
• Powering On the M7i Router on page 125
Troubleshooting the M7i FIC or PICs
Problem Description: The FIC or PICs are not functioning normally.
Solution To troubleshoot the FIC or PICs:
• To check the status of each port on a FIC or PIC, look at the LED located on the
faceplate. For information about the meaning of LED states on different PICs, see the
M7i Multiservice Edge Router Interface Module Reference.
• To check the status of an interface, issue the show chassis fpc pic-status command.
The following example specifies an FPC slot number (0), which is optional.
user@host> show chassis fpc pic-status 0
Slot 0 Online PIC 0 2x OC-3 ATM, MM PIC 1 2x CT3-NxDS0 PIC 2 2x
OC-3 ATM, MM
For further description of the output from the command, see the CLI Explorer.
205Copyright © 2019, Juniper Networks, Inc.
Chapter 29: Troubleshooting Components
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