Cisco Catalyst 4500 Series Command Reference Manual page 420

issu abortversion
Command
issu runversion
show issu state
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Description
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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