Troubleshooting The Mx480 Dpcs - Juniper MX480 Hardware Manual

MX480 Universal Routing Platform Hardware Guide
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Troubleshooting the MX480 DPCs

Problem
Solution
356
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.
If a fan tray is removed, a yellow alarm and a red alarm occur.
The following conditions automatically cause the fans to run at full speed and also
trigger the indicated alarm:
A fan fails (red alarm).
The router temperature exceeds the "temperature warm" threshold (yellow alarm).
The temperature of the router exceeds the maximum ("temperature hot") threshold
(red alarm and automatic shutdown of the power supplies).
Alarm LEDs and Alarm Cutoff/Lamp Test Button on the MX480 Craft Interface on
page 37
Replacing the MX480 Fan Tray on page 238
Maintaining the MX480 Air Filter on page 233
Maintaining the MX480 Fan Tray on page 236
Description: The DPCs are not functioning normally.
Monitor the green LED labeled
DPC is seated in an operating router.
The Routing Engine downloads the DPC software to it under two conditions: the DPC
is present when the Routing Engine boots Junos OS, and the DPC is installed and
requested online through the CLI or push button on the front panel. The DPC then runs
diagnostics, during which the
normally, the LED lights green steadily.
OK
Make sure the DPC is properly seated in the midplane. Check that each ejector handle
has been turned clockwise and is tight.
Check the OK/FAIL LED on the DPC and
When the DPC is online and functioning normally, the
Issue the show chassis fpc
in the sample output, the value
DPC is functioning normally:
user@host> show chassis fpc
Temp CPU Utilization (%)
Slot State
0 Online
1 Online
2 Online
OK above the DPC on the craft interface as soon as a
OK LED blinks. When the DPC is online and functioning
OK and FAIL
command to check the status of installed DPCs. As shown
in the column labeled
Online
Memory
(C) Total Interrupt
41 9 0
43 5 0
43 11 0
DPC LEDs on the craft interface.
LED lights green steadily.
OK
indicates that the
State
Utilization (%)
DRAM (MB) Heap Buffer
1024 15
1024 16
1024 16
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