Telnet Failed

dellpedellpe Member Posts: 16 ■□□□□□□□□□
Recently received two new switches, model S5700-28C-SI (V200R001C00), I've tried configure the authentication-mode password user the user-interface vty.
However , the telnet fail but telnet will be successful if the authentication mode is aaa.
Below are the config:
user-interface con 0
user-interface vty 0 4
authentication-mode password
user privilege level 1
user-interface vty 16 20


While debugging vty negotiate, the error "EXEC do not support null authentication-mode".
Is there any issue with this switch or my configuration have problem?


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