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JUNOSe 11.1.x Service Availability Configuration Guide
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.
NOTE: We recommend that you issue the show issu command before beginning the
unified in-service software upgrade. The output of the command lists any necessary
conditions that are not currently met on the router. You can therefore correct these
failures before entering into the upgrade. You can issue the show issu command at
any time.
NOTE: On E120 and E320 routers, you can hot swap an IOA during the initialization
phase without affecting the in-service software upgrade. However, we strongly
recommend that you perform any necessary hot swaps before you issue the issu
initialize command.
If the standby SRP module reloads during the initialization phase, unified ISSU is
halted. You must begin again by issuing the issu initialize command.
Application Data Upgrade on the Standby SRP Module
Synchronized modules can become unsynchronized because you can change the
router configuration at any time until you issue the issu start command. When the
verification process is completed, unified ISSU starts up the stateful SRP switchover
process to maintain synchronization between the active SRP module and the standby
SRP module during the SRP module upgrade phase.
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Unified ISSU Initialization Phase Overview
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