Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 120

JUNOSe 11.1.x Service Availability Configuration Guide
NOTE: If the results indicate that some requirements are not met, you must correct
this situation before proceeding.
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Related Topics
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Upgrading Router Software with Unified ISSU
Ensure that stateful SRP switchover is configured on the router.
host1#show redundancy srp
If it is not already configured, do so now.
host1(config)#redundancy
host1(config-redundancy)#mode high-availability
For each configured protocol on the router and its neighbors, ensure that graceful
restart is configured. See the relevant protocol configuration chapters in the
JUNOSe document set for information about configuring graceful restart.
Begin the initialization phase of the unified in-service software upgrade.
host1#issu initialize
The CLI displays the status of the initialization as it proceeds.
(Optional) From a different CLI session, display the progress of the initialization.
host1#show issu
Unified ISSU must be in the Initialized state before you proceed to the next step.
The time required for initialization varies with the system load and the complexity
of the router configuration.
Start the upgrade phase.
host1#issu start
The router switches to the redundant SRP module running the upgrade release,
R2.rel. Significant upgrade milestones are displayed as they occur.
When the console indicates that the upgrade is completed, you can verify that
the router is back in the idle state and running the upgrade release, R2.rel.
host1#show issu
You can also verify the status of the SRP modules and line modules, as well as
the running and armed releases.
host1#show version
issu initialize
issu start
issu stop
license issu