Understanding ISSU guidelines
During an ISSU, use the following guidelines:
In a multiuser environment, make sure no other administrators access the device while you are performing the ISSU.
Do not perform any of the following tasks during an ISSU:
Reboot, add, or remove member devices.
Execute commands that are not related to the ISSU.
Modify, delete, or rename image files.
You cannot use both install and issu commands for an ISSU. However, you can use display issu commands with both command sets.
After an ISSU, you must log in to the device again before you can configure the device.