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The simulator is notoriously unstable after a while. This is experience from multiple installations in multiple environments.While we didn't encounter that vmware rebooted it, we can see that overtime it can be nonresponsive or unusuable (I am guessi...
The reason why you should try to upgrade them as soon as possible after is if you are pushing new configuration (or features) which the old software wouldn't understand. For minor releases this is not generally an issue, had several customers that ha...
Yes - every time you reboot the emulator it will reset.So you need to make a remote destination and an export policy (backup of config) to save your settings so you can import it for next time.
Did you check the upgrade paths?Also, the waiting for plymouth, did you do the KVM mounted console? Try to mount the ISO from CIMC and use SOL as explained in Cisco APIC Installation and ACI Upgrade and Downgrade Guide - Installing or Recovering Cisc...