Image Upgrade
If you upgrade from any 15.xx version to version 16.xx, the following minimal set of configuration is validated to enable or disable the ZTP process:
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If the switch has any other VLAN apart from the default VLAN, ZTP gets disabled.
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In default VLAN, if the IPv4 address is not set as DHCP (default option is DHCP), ZTP gets disabled.
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In default VLAN, if IPv6 is enabled or configured, ZTP gets disabled.
If you have any other configuration during the upgrade, ZTP will continue to be in the enabled state.