Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Network Operation Manual page 596

JUNOS Internet Software Network Operations Guide: Hardware
Monitor Redundant Control Board Tasks
Switching Control Board Mastership on page 565
Checking the Control Board Alarms on page 565
Replacing a Control Board on page 566
Returning the Control Board on page 566
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560
Command or Action
Press the Control Board offline button on the component
faceplate.
See "Checking the Control Board Alarms" on page 308. For
conditions that trigger Control Board alarms, see "Display the
Current Router Alarms" on page 61.
1. Determine whether the host subsystem is functioning as
master or as backup by using the
command.
routing-engine
2. Take the host subsystem offline if the Control Board is
master by using the
request chassis routing-engine master
command.
switch
3. Replace the Control Board with a known working one.
4. Check the Control Board status by examining the LEDs on
the Control Board faceplate, or by using the
command.
hardware
Locate the Control Board serial number ID label. See "Return
the Failed Component" on page 86 or the appropriate
hardware guide.
show chassis
show chassis