user@host# commit
6. Determine the order to replace the existing SCBs with upgraded ones. SCB0 is
associated with RE0 and SCB1 is associated with RE1.
NOTE: Do not add or remove any router hardware during the upgrade
procedure.
Upgrading the SCB in the Backup Routing Engine
TIP: MX240 has two slots for SCB—that is, SCB0 and SCB1—and these
correspond to RE0 and RE1, respectively, where SCB1 is the first SCB.
To upgrade the SCB in the backup Routing Engine:
1. Power down the backup Routing Engine from the master Routing Engine by issuing
the request system power-off other-routing-engine command.
2. Verify that the Routing Engine is powered down by issuing the show chassis
routing-engine 1 command. The slot of the Routing Engine may be 0 or 1, and is shown
as 1 in this example:
user@host> show chassis routing-engine 1
Routing Engine Status:
Slot 1:
Current State Present
Verify that the Current State is Present, which indicates that the Routing Engine is
offline.
3. Take the fabric plane offline by issuing the request chassis fabric plane 4 offline
command. SCB1 has four fabric planes numbered, 4, 5, 6, and 7.
4. Verify that the fabric plane is offline by issuing the show chassis fabric summary
command.
user@host> show chassis fabric summary
Plane State Uptime
4 Offline
5 Online 1 hour, 15 minutes, 35 seconds
Verify that the 'State’ of Plane 4 is Offline.
5. Take the remaining fabric planes offline by issuing the request chassis fabric plane
5/6/7 offline command—that is, by changing the fabric plane number each time. Verify
that the fabric planes are offline by issuing the command given in Step 2.
361Copyright © 2017, Juniper Networks, Inc.
Chapter 27: Replacing Switch Fabric Components
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