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Software Configuration Guide—Release 15(02)SG
OL-23818-01
Chapter 5 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU Process
A switchover occurs at this point. At the new active supervisor engine, after old active supervisor engine comes up as the standby engine, do the following:
Switch# show issu state detail
Slot = 2
RP State = Active
ISSU State = Run Version
Boot Variable = bootflash:new_image,12;bootflash:old_image,12
Operating Mode = Stateful Switchover
Primary Version = bootflash:new_image
Secondary Version = bootflash:old_image
Current Version = bootflash:new_image
Slot = 1
RP State = Standby
ISSU State = Run Version
Boot Variable = bootflash:old_image,12
Operating Mode = Stateful Switchover
Primary Version = bootflash:new_image
Secondary Version = bootflash:old_image
Current Version = bootflash:old_image

Note The new active supervisor engine is now running the new version of software, and the standby supervisor

engine is running the old version of software and is in the standby hot state.
Switch# show redundancy states
my state = 13 -ACTIVE
peer state = 8 -STANDBY HOT
Mode = Duplex
Unit = Secondary
Unit ID = 2
Redundancy Mode (Operational) = Stateful Switchover
Redundancy Mode (Configured) = Stateful Switchover
Redundancy State = Stateful Switchover
Maintenance Mode = Disabled
Manual Swact = enabled
Communications = Up
client count = 39
client_notification_TMR = 240000 milliseconds
keep_alive TMR = 9000 milliseconds
keep_alive count = 1
keep_alive threshold = 18
RF debug mask = 0x0
Once runversion command completes, the new active supervisor engine is running the new version of software and the previously active supervisor engine now becomes the standby supervisor engine. The standby is reset and reloaded, but remains on the previous version of software and come back online in standbyhot status. The following example shows how to verify these conditions:
Switch# show redundancy
Redundant System Information :
------------------------------
Available system uptime = 23 minutes
Switchovers system experienced = 1
Standby failures = 0
Last switchover reason = user forced