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JUNOSe 11.1.x Service Availability Configuration Guide
Unified ISSU Upgrade Phase Overview
During the upgrade phase, the CLI supports only a reduced set of administrative
commands. You cannot interrupt the upgrade phase. The upgrade phase cannot
commence if any CLI commands outside of this set are executing when you issue
the issu start command.
NOTE: Although you can use any CLI session to issue the issu start command, we
recommend that you issue the command from a session to the management console
port. When the standby SRP module switchover takes place, all management network
connections through the Ethernet management port are dropped, and you can access
the router only through a console port until the service restoration phase is completed.
When you issue the issu start command, unified ISSU performs the following
operations:
1.
2.
3.
4.
5.
6.
You can view the status of the router and the progress of the upgrade at any time
by issuing the show issu command from another terminal session to the router.
66
Unified ISSU Upgrade Phase Overview
Verifies that the unified ISSU requirements on the router are still met.
Verifies that the active and standby SRP modules are synchronized. If they are
not synchronized, forces a synchronization to ensure that all configuration and
file system changes are propagated to the standby SRP module before proceeding
with the upgrade.
Copies the NVS configuration from a backup memory area to the flash card on
the standby SRP module. During the initialization phase, this configuration data
was mirrored from NVS on the active SRP module and upgraded as required by
the armed release.
Upgrades the control plane on each line module at the same time.
Switches control from the primary SRP module (running the current release) to
the standby SRP module (running the armed upgrade release).
Upgrades the forwarding plane on each line module at the same time. The fabric
is switched and upgraded.
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