7. Verify that the control board is offline by issuing the show chassis environment cb 1
command:
user@host> show chassis environment cb 1
CB 1 status:
State Offline
Power 1 Disabled
Power 2 Disabled
8. Attach an electrostatic discharge (ESD)grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
9. Remove and replace SCB1 on the router with the SCBE.Use the replacement procedure
described in“Removing an MX240 SCB” on page 356.
10. Verify that the installation is successful and the SCB is online by issuing the show
chassis environment cb 1 command:
user@host> show chassis environment cb 1
CB 1 status
State Online
Temperature 30 degrees C / 86 degrees F
Other details, such as power, are also displayed, along with the state.
11. Verify that the fabric planes come online correctly by issuing the show chassis fabric
summary command:
user@host> show chassis fabric summary
Plane State Uptime
4 Online 2 minutes, 25 seconds
5 Online 2 minutes, 15 seconds
6 Online 2 minutes, 3 seconds
7 Online 1 minute, 49 seconds
12. Verify that the backup Routing Engine is back online by issuing the show chassis
routing-engine 0 command:
user@host> show chassis routing-engine 0
Routing Engine Status:
Slot 0:
Current State Backup
13. Verify the alarms by issuing the show chassis alarms command:
user@host> show chassis alarms
Alarm Time Class Description
2011-06-01 13:26:56 EDT Major CB fabrics are of mixed types
Because only one SCB has been upgraded, the alarm indicates that the SCBs are of
mixed type. This alarm is cleared after all the control boards are upgraded.
Copyright © 2017, Juniper Networks, Inc.350
MX240 3D Universal Edge Router Hardware Guide
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