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NOTE: While a unified ISSU operation is in progress, do not remove the SRP modules
or attempt to reset them. Removing the SRP modules anytime during unified ISSU
has an adverse impact.
After the unified ISSU operation is completed, issue the show version command.
The output from a successful upgrade indicates the following:
You can then remove an SRP module after issuing the halt command.
Exceptions During the Upgrade Phase
Table 13 on page 67 describes the behavior of the router during the upgrade phase
when certain exceptional events take place outside the context of the unified in-service
software upgrade.
Table 13: Router Response to Undesirable Events During the Upgrade Phase
The formerly active SRP module has rebooted and come up as the new standby
SRP module.
The newly active SRP module indicates that the formerly active SRP has rebooted
and has come up as standby SRP module
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
The unified ISSU operation halts.
module switches
The router undergoes a cold restart.
over to the standby
The router boots with the armed upgrade release.
SRP module.
The line modules reboot.
The standby SRP
The unified ISSU operation halts.
module reloads.
The router undergoes a cold restart.
The router boots with the armed upgrade release.
The line modules reboot.
A line module
The line module is held down and prevented from rebooting until the
reloads.
service restoration phase is completed. The line module then
undergoes a cold reboot to the running (post-upgrade) release.
An IOA is
Hot swapping is disabled during the upgrade phase. The line module
hotswapped.
undergoes a cold reboot and hot swapping is reenabled when the
service restoration phase is completed,
Chapter 4: Configuring a Unified In-Service Software Upgrade
Unified ISSU Upgrade Phase Overview
67
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