1. Verify that the system runs Junos OS Release 11.4 or later by issuing the show version command on
the master router. Here’s an example for the MX960:
user@host> show version
Model: mx960
Junos Base OS Software Suite [11.4-20110530];
NOTE: The SCBE-MX 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 SCB-MX boards are installed:
user@host> show chassis hardware
Item Version Part Number Serial Number Description
CB0 REV 07 710-021523 ABBC8281 MX SCB
CB1 REV 07 710-021523 ABBC8323 MX SCB
CB2 REV 07 710-021523 ABBD1410 MX SCB
SCB-MX details are displayed as above, along with other hardware components.
3. Establish console connections to both Routing Engines. You can use a telnet session to connect to the
router console by issuing the <router name>-con command. For example, if the router name is juniper,
you can connect to RE0 and RE1 consoles by issuing the telnet juniper-con and telnet juniper1-con
commands.
4. Ensure that graceful switchover (GRES), commit synchronize (required for nonstop routing), and nonstop
routing (NSR) are enabled or configured by running the set chassis redundancy graceful-switchover,
set system commit synchronize, set routing-options nonstop-routing commands.
NOTE: These commands are mandatory for this upgrade and may be removed, if desired,
after the upgrade.
5. Set the upgrade flag on and start the SCB-MX upgrade by issuing the set chassis state cb-upgrade on
command.
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