I am looking for help on what happens with the below example if the TACACS server fails and you try to console into the device. I am assuming that the next order would be "aaa authentication login line-only line" but I'm not understanding what the "line-only" means. I can't find that reference in any of the docs.
aaa authentication login default group tacacs+ enable
aaa authentication login line-only line
aaa authentication enable default group tacacs+ enable
aaa authorization exec default group tacacs+ if-authenticated
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+