Dell SmartFabric OS10 User Guide Release 10.5.3

Startup configuration during upgrade or downgrade

This section is only applicable for Release 10.5.1.0 or later.

Each version of OS10 has a copy of startup configuration, which acts as a backup while falling back to that version.

• During upgrade, the startup configuration is copied from a lower version to a higher version whether or not a configuration file is available in the image corresponding to the higher version.
• During downgrade, the backed-up startup configuration of the target version is used, provided it is not erased with the image install command. Configuration changes done while in the higher version are lost.
• When a lower version is installed using the image install command, the startup configuration is not backed up for that version and therefore the switch starts with the default configuration.
  • Maintenance releases based on the same main release (for example, 10.5.1.0 and 10.5.1.1) are considered as different versions. Therefore, downgrade to a lower version follows the above behavior of starting with the default configuration.
  • Patch releases based on the same base release (for example, 10.5.1.1P1 and 10.5.1.1P2) are considered as same version and configuration is carried forward even when upgrading or downgrading using the image install command.
• Even if the startup configuration is deleted in the newer version, the older version still uses its own saved configuration.