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Exceptions During the Upgrade Phase

Table 48 describes the behavior of the router during the upgrade phase when certain exceptional events take place outside the context of the in-service software upgrade.

Table 48: Router Response to Undesirable Events During the Upgrade Phase

Event

Router Action

The router reloads.
  • The unified ISSU operation halts.
  • The router undergoes a cold restart.
  • The router boots with the armed upgrade release.
  • The line modules reboot.

The primary SRP module switches over to the standby SRP module.
  • The unified ISSU operation halts.
  • The router undergoes a cold restart.
  • The router boots with the armed upgrade release.
  • The line modules reboot.

The standby SRP module reloads.
  • The unified ISSU operation halts.
  • The router undergoes a cold restart.
  • The router boots with the armed upgrade release.
  • The line modules reboot.

A line module reloads.
  • The line module is held down and prevented from rebooting until the service restoration phase is completed. The line module then undergoes a cold reboot to the running (pre-upgrade) release.

An IOA is hotswapped.
  • Hot swapping is disabled during the upgrade phase. The line module undergoes a cold reboot and hot swapping is reenabled when the service restoration phase is completed,

An application that does not support unified ISSU is configured.
  • This event can take place only before the issu start command is issued, because that command disables CLI configuration commands. When you issue the issu start command, after configuring such an application, the command exits and generates an error message.
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