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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
 
Chapter 8      Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
% changeversion finished executing loadversion, waiting for standby to reload and reach 
SSO ...
Note Standby reloads with target image.
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*Feb 25 20:41:00.479: %INSTALLER-7-ISSU_OP_SUCC:  issu changeversion is now executing 
'issu runversion'
*Feb 25 20:41:03.639: %INSTALLER-7-ISSU_OP_SUCC:  issu changeversion successfully executed 
'issu runversion'
Note Switchover occurs.
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Look at the console of new active supervisor engine.
*Feb 25 20:47:39.859: %RF-5-RF_TERMINAL_STATE: Terminal state reached for (SSO) 
*Feb 25 20:47:39.971: %INSTALLER-7-ISSU_OP_SUCC:  issu changeversion is now executing 
'issu commitversion'
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Note The new standby supervisor engine reloads with target image; changeversion is successful upon 
SSO terminal state is reached.
*Feb 25 20:54:16.092: %HA_CONFIG_SYNC-6-BULK_CFGSYNC_SUCCEED: Bulk Sync succeeded
*Feb 25 20:54:16.094: %RF-5-RF_TERMINAL_STATE: Terminal state reached for (SSO) 
Switch#
Switch# show issu state detail
                               Slot = 6
                           RP State = Active
                         ISSU State = Init
                     Operating Mode = Stateful Switchover
                      Current Image = bootflash:y.bin
          Pre-ISSU (Original) Image = N/A
         Post-ISSU (Targeted) Image = N/A
                               Slot = 5
                           RP State = Standby
                         ISSU State = Init
                     Operating Mode = Stateful Switchover
                      Current Image = bootflash:y.bin
          Pre-ISSU (Original) Image = N/A
         Post-ISSU (Targeted) Image = N/A
Switch# show redundancy
Redundant System Information :
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       Available system uptime = 10 hours, 58 minutes
Switchovers system experienced = 1
              Standby failures = 1