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
Monitoring the PCG Status
Monitor the PCG Environmental Status	show chassis environment show chassis environment pcg
Display the PCG LED States at the Command Line	show chassis craft-interface
Look at the PCG LEDs on the Faceplate	Remove the rear component cover and look on the PCG faceplate at the back of the M40e or M140 router chassis.
Determining PCG Mastership
Display the PCG Master in the Craft Interface Output	show chassis craft-interface
Look at the PCG LEDs on the Faceplate	Remove the rear component cover and look on the PCG faceplate at the rear of the M40e or M160 router chassis.
Display the Packet Forwarding Engine Current Clock Source	show chassis clocks
Displaying PCG Alarms
Display Current PCG Alarms	show chassis alarms
Display PCG Error Messages in the System Log File	show log messages
Display PCG Error Messages in the Chassis Daemon Log File	show log chassisd
Verifying PCG Failure
Check the PCG Connection	Check the thumbscrew on the right side of the PCG.
Check the PCG Fuses	The M40e and M160 router fuses are located in a fuse box at the rear of the midplane, behind the lower rear impeller assembly.
Perform a PCG Swap Test	Take the PCG offline. Replace the PCG with one that you know works. Bring the PCG online. Check the PCG status.
Getting PCG Hardware Information
Display the PCG Hardware Information	show chassis hardware
Locate the PCG Serial Number ID Label	Look on the top of the PCG, close to the midplane connector.
Replacing the PCG	See Return the Failed Component, or follow the procedure in the M40e or M160 router hardware guide.