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Unified ISSU Initialization Phase Overview

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 that the rate of logins might be affected). 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 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 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.

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