Troubleshooting Dpcs - Juniper MX240 Hardware Manual

If the fans are not functioning normally, follow these guidelines to troubleshoot the
fans:

Troubleshooting DPCs

NOTE: The show chassis fpc command, shows status of the DPCs.
To verify that the DPCs are operating normally:
See "Maintaining Cooling System Components" on page 68.
If the red alarm LED on the craft interface lights, use the CLI to get information
about the source of an alarm condition:
information about alarms, see "Alarm LEDs and Alarm Cutoff/Lamp Test
Button" on page 18.
If the CLI output lists only one fan failure, and the other fans are functioning
normally, the fan is most likely faulty and you must replace the fan tray, as
described in "Replacing the Fan Tray" on page 92.
Place your hand near the exhaust vents at the side of the chassis to determine
whether the fans are pushing air out of the chassis.
Check the LED on the DPC and
OK/FAIL
interface. When the DPC is online and functioning normally, the
green steadily.
Issue the show chassis fpc
shown in the sample output, the value
that the DPC is functioning normally:
user@host> show chassis fpc
Temp CPU Utilization (%)
Slot State
0 Online
57
1 Online
57
2 Online
57
For more detailed output, add the
specify a slot number, which is optional:
user@host> show chassis fpc detail
Slot 1 information:
State
Temperature
Total CPU DRAM
Chapter 12: Troubleshooting Hardware Components
user@host> show chassis alarms
and
OK FAIL
command to check the status of installed DPCs. As
in the column labeled
Online
Memory
(C) Total Interrupt
33 9 0
33 5 0
33 11 0
option. The following example does not
detail
Online
33 degrees C / 91 degrees F
1024 MB
. For
DPC LEDs on the craft
OK LED lights
indicates
State
Utilization (%)
DRAM (MB) Heap Buffer
1024 15
1024 16
1024 16
83
Troubleshooting DPCs