Juniper MX480 - Upgrading an MX480 SCB; Preparing for the Upgrade

• Operating and Positioning the MX480 SCB Ejectors
• Effect of Taking the MX480 Host Subsystem Offline
• Taking an MX480 Host Subsystem Offline
Upgrading an MX480 SCB
1.
Preparing for the Upgrade on page 385
2.
Upgrading the SCB in the Backup Routing Engine on page 387
3.
Upgrading the SCB in the Master Routing Engine on page 389
4.
Completing the SCB Upgrade on page 391
Preparing for the Upgrade
NOTE: Do not make other changes to the CLI during the entire upgrade
process. You can ensure that you will not make such changes by opening a
telnet session to the masterRE CLI operationalmode and issuing the configure
exclusive command. This command locks the configuration procedure.
TIP: To prevent traffic loss during the upgrade process, we recommend that
you operate the line cards at 50% line rate. This 50% limit must be
maintained per PFE on each line card.
To prepare the MX480 router for the Enhanced MX Switch Control Board (MX SCBE)
upgrade:
1. Verify that the system runs Junos OS Release 11.4 or later by issuing the show version
command on the master router.
user@host> show version
Model: mx480
Junos Base OS Software Suite [11.4-20110530];
NOTE: The MX SCBE is supported only in Junos OS Release 11.4 or later.
The latest software ensures a healthy system—that is, Routing Engines, control boards,
and FPCs—before the upgrade.
2. Verify that MX SCB boards are installed by issuing the show chassis hardware
command.
user@host> show chassis hardware
Item Version Part Number Serial Number Description
385Copyright © 2017, Juniper Networks, Inc.
Chapter 27: Replacing Switch Fabric Components