Cisco Catalyst 4500 Series Software Configuration Manual page 297

Chapter 5 Configuring Virtual Switching Systems
This example shows how to cause a switchover to the former standby supervisor engine (slot 11), reset
the former active supervisor engine and reload it with the old IOS XE software image so it becomes the
standby supervisor engine:
Switch> enable
Switch# issu runversion 11 slavebootflash:new_image
%issu runversion initiated successfully
A switchover happens at this point. At the new active supervisor engine, do the following after old active
supervisor engine comes up as standby.
Switch# show issu state detail
The new active supervisor engine is now running the new version of software, and the standby supervisor
Note
engine is running the old version of software and is in the standby hot state.
Switch# show redundancy states
Redundancy Mode (Operational) = Stateful Switchover
Redundancy Mode (Configured) = Stateful Switchover
Communications = Up
client_notification_TMR = 240000 milliseconds
Once Runversion has completed, the new active supervisor engine will be running the new version of
software and the previously active supervisor engine will now become the standby supervisor engine.
The standby supervisor engine will be reset and reloaded, but it will remain on the previous version of
software and come back online in Standby hot status.
Use the show redundancy, show redundancy states, and show issu state [detailed] commands
described previously to verify that the standby supervisor engine is running the pre-upgrade version and
that the Active is running the post-upgrade version.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
RP State = Active
ISSU State = Run Version
Operating Mode = Stateful Switchover
Current Image = bootflash:new_image
Pre-ISSU (Original) Image = bootflash:old_image
Post-ISSU (Targeted) Image = bootflash:new_image
RP State = Standby
ISSU State = Run Version
Operating Mode = Stateful Switchover
Current Image = bootflash:old_image
Pre-ISSU (Original) Image = bootflash:old_image
Post-ISSU (Targeted) Image = bootflash:new_image
my state = 13 -ACTIVE
peer state = 8 -STANDBY HOT
Mode = Duplex
Unit = Primary
Unit ID = 11
Redundancy State = Stateful Switchover
Manual Swact = enabled
client count = 474
keep_alive TMR = 9000 milliseconds
keep_alive count = 0
keep_alive threshold = 18
RF debug mask = 0
Slot = 11
Slot = 1
In-Service Software Upgrade (ISSU) on a VSS
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