Cisco Catalyst 4500 Series Command Reference Manual page 444

issu loadversion
Command
issu commitversion
issu runversion
show issu state
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Description
Loads the new Cisco IOS software image into the new
standby supervisor engine.
Forces a change from the active supervisor engine to the
standby supervisor engine and causes the newly active
supervisor engine to run the new image specified.
Displays the ISSU state and current booted image name
during the ISSU process.
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