Cisco Catalyst 4500 Series Command Reference Manual page 428

issu runversion
Command
issu loadversion
show issu state
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
2-370
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Description
Starts the ISSU process.
Displays the ISSU state and current booted image name
during the ISSU process.
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