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Periodic CatOS convert_post_SAC_CiscoMIB: syslog messages are generated on the switch
Different versions of Catalyst OS (CatOS) contain variables that are stored in NVRAM. When the switch initially boots to a newer or older version of CatOS, it will convert the previous configuration to a version usable by the current boot image. During this process a particular memory block that is not needed or usable in the current form will be de-allocated rather than converted. This internal function generates the error message.
The following is an example of the console output you will see when this message occurs:
These console messages can also occur when loading a switch configuration generated by another switch, or using a switch configuration from another version of code. A failover to the standby Supervisor Engine can also generate these messages.
The generation of this message is generally informational only. It is a good practice to compare the previous configuration with the current configuration to verify all configuration information was properly converted.