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JunosE 11.3.x Service Availability Configuration Guide
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Unified ISSU Initialization Phase Overview
108
up to 40 minutes depending on the number of software releases across which the
router is being upgraded.
Upgrade Phase—When you issue the issu start command, unified ISSU again verifies
2.
whether all prerequisites for the upgrade have been met. During this phase the line
module control plane and forwarding plane are upgraded and all three hardware
components are resynchronized.
Service Restoration Phase—This phase automatically begins without user intervention
3.
when the upgrade phase has completed. During this final phase, the router is returned
to a normal, runtime state.
Unified ISSU Initialization Phase Overview on page 108
Unified ISSU Upgrade Phase Overview on page 110
Unified ISSU Service Restoration Phase Overview on page 115
Halting Unified ISSU During Initialization Phase on page 142
Halting Unified ISSU During Upgrade Phase on page 143
When you issue the issu initialize command, unified ISSU first verifies whether all
requirements for the upgrade are met. The verification process examines the running
release, the SRP modules, the line modules, line module redundancy, and the router
configuration.
The issu initialize command does not interrupt or disrupt any of the runtime operations
of the router. The command has no effect on changes of authorization, forwarding, or
subscribers (except perhaps, rate of logins). You cannot manually change the file system
redundancy mode from high availability to file synchronization until the unified in-service
software upgrade is completed.
NOTE: We recommend that you make no configuration changes after you
have issued the issu initialization command. As a best practice, ensure that
your configuration is complete before you start the software upgrade.
During the initialization phase, you can halt the unified in-service software upgrade at
any time and revert either to a normal SRP module switchover or to the previous state
of the router. To stop the unified ISSU process, you must issue the issu stop command.
If instead you simply exit the CLI session, the unified ISSU initialization phase continues.
The action taken when a requirement is not met depends on the requirement. For some
failed verifications, the CLI warns you of the issue and prompts you to proceed or quit
the upgrade process. More serious failures cause the CLI to exit the command and provide
a message describing the issue.
Copyright © 2010, Juniper Networks, Inc.
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