If a remote authentication method does not return a local user attribute string after a remote user is authenticated, the remote user will be mapped to a default local user account.
Prerequisites
Admin access
To specify the default local user account:
Any non-mapped users will default to the specified local user account.
Go to CLI configuration mode:
hostname > enable hostname # configure terminal
To specify the default local user account, use the following command:
aaa authorization map default-user <username>Save your changes:
hostname (config) # write memory