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A new image takes time to load in Catalyst 6000/6500 Series Switches after a software upgrade
The time to boot up depends on the modules you have, your configuration, your diagnostic level previously set, problems with Flash memory, and the new features included in every version. A normal boot-up time can be around 5 minutes.
If you have the diagnostic level in the complete mode, then this level runs all possible POST tests every time you boot up the switch. This can take several seconds. If you have a fully populated chassis (which you have), this can cause the boot process to take several minutes. In Catalyst OS (CatOS), use the set test diaglevel command to change the diagnostic level to minimum. Alternatively, you can bypass diagnostics for testing purposes. The default is minimal diagnostics.