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Chapter 28
Monitoring the PCG
You monitor the Packet Forwarding Engine Clock Generator (PCG) to ensure that a
clocking signal is generated to synchronize the internal M40e and M160 router
Packet Forwarding Engine components. (See Table 89.)
Table 89: Checklist for Monitoring the PCG
Monitor PCG Tasks Command or Action
Understanding the PCG on page 370
Monitoring the PCG Status on page 371
1. Monitor the PCG Environmental Status on page 371 show chassis environment
show chassis environment pcg
2. Display the PCG LED States at the Command Line on
page 372
show chassis craft-interface
3. Look at the PCG LEDs on the Faceplate on page 373 Remove the rear component cover and look on the PCG
faceplate at the back of the M40e or M140 router chassis.
Determining PCG Mastership on page 373
1. Display the PCG Master in the Craft Interface Output on
page 373
show chassis craft-interface
2. Look at the PCG LEDs on the Faceplate on page 374 Remove the rear component cover and look on the PCG
faceplate at the rear of the M40e or M160 router chassis.
3. Display the Packet Forwarding Engine Current Clock Source
on page 374
show chassis clocks
Displaying PCG Alarms on page 375
1. Display Current PCG Alarms on page 375 show chassis alarms
2. Display PCG Error Messages in the System Log File on
page 375
show log messages
3. Display PCG Error Messages in the Chassis Daemon Log File
on page 375
show log chassisd
Verifying PCG Failure on page 376
1. Check the PCG Connection on page 376 Check the thumbscrew on the right side of the PCG.
2. Check the PCG Fuses on page 377 The M40e and M160 router fuses are located in a fuse box at
the rear of the midplane, behind the lower rear impeller
assembly.
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