CE series switches support multiple authentication methods.If multiple authentication modes are configured in an authentication scheme, these authentication modes are used according to the sequence in which they were configured. The device uses another authentication mode only when no response is received in the previous authentication. If an authentication fails, the device does not use another authentication mode.

For example, configure RADIUS authentication and local authentication for the authentication scheme named scheme0.

<HUAWEI> system-view
[HUAWEI] aaa
[HUAWEI-aaa] authentication-scheme scheme0
[*HUAWEI-aaa-authen-scheme0] authentication-mode radius local
[*HUAWEI-aaa-authen-scheme0] commit

You can also find the answer in Common AAA Operations.