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Action To display the current PCG alarms, use the following command:

user@host> show chassis alarms

Sample Output

user@host> show chassis alarms

2 alarms currently active

Alarm time Class Description

2002-06-11 20:30:29 PDT Minor PCG 0 Not Online

2002-06-11 20:30:32 PDT Minor No PCGs Online

Meaning The command output displays the alarm date, time, severity level, and description.

Documentation

Checklist for Monitoring Redundant PCGs on page 703•

Replace a PCG

The PCGs are hot-pluggable. You can remove and replace them without powering down

the router; however, the routing functions of the system are interrupted when the PCG

is removed.

If both PCGs are installed and functioning normally, PCG0 is the master PCG and PCG1

is the backup by default.

Removing the backup PCG does not affect the functioning of the router. Taking the master

PCG offline causes the Flexible PIC Concentrators (FPCs) and Switching and Forwarding

Modules (SFMs) to power down and restart, with the other PCG selected as master. The

forwarding and routing functions are interrupted during this process.

To remove and replace a PCG:

1. Lay an electrostatic bag or antistatic mat on a flat, stable surface to receive the PCG.

2. Attach an electrostatic discharge (ESD) strap to your bare wrist, and connect the

strap to one of the ESD points on the chassis.

3. Remove the rear component cover by loosening the screws at the corners of the cover

and pulling it straight off of the chassis.

4. Press and hold the offline button on the PCG faceplate until the yellow LED labeled

FAIL lights, which takes about 3 seconds.

If you are removing the master PCG, forwarding halts while the Packet Forwarding

Engine resets so that the components start using the clock signal from the other PCG,

which becomes the master.

5. Loosen the mounting screw on the right edge of the PCG faceplate, using a Phillips

screwdriver if necessary.

6. Grasp the screw and slide the PCG about halfway out of the chassis.

M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series User Manual

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