1. Verify that you are running Junos OS Release 7.3 or later.
2. Include the fabric upgrade-mode statement in the configuration at the [edit chassis]
hierarchy level.
user@host# set chassis fabric upgrade-mode
3. Commit the configuration on both the master and the backup Routing Engines.
user@host# commit synchronize
4. Display the status of the T640 router SIBs by issuing the show chassis sibs command:
user@host> show chassis sibs
Slot State Uptime
0 Spare 255 days, 31 minutes, 12 seconds
1 Online 255 days, 31 minutes, 12 seconds
2 Online 255 days, 31 minutes, 12 seconds
3 Online 255 days, 31 minutes, 12 seconds
4 Online 255 days, 31 minutes, 12 seconds
Verify that four SIBs are in the Online state. If five SIBs are installed, verify that one
SIB is in the Spare state. To bring a SIB online, issue the request chassis sib online
operational mode command.
Replacing T640 Standard SIBs with Standard SIB Version B
To replace the T640 standard SIBs with Standard SIB Version B, perform the following
procedures:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Select one of the SIBs to replace, and take it offline by using one of the following
methods:
•
Press and hold the ONLINE/OFFLINE button on the SIB faceplate for about five
seconds until the OK LED is not lit.
•
Issue the request chassis sib offline command. For example:
user@host> request chassis sib offline slot 0
NOTE: When you bring an active SIB offline, the spare SIB becomes active
and transitions to the Online state.
Copyright © 2017, Juniper Networks, Inc.428
T640 Core Router Hardware Guide
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