QTECH QSW-2800 Инструкция по настройке - Manual (Page 327)

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Switch(Config-if-vlan1)#ip address 10.1.1.2 255.255.255.0
Switch(Config-if-vlan1)#exit
Switch(config)#tacacs-server authentication host 10.1.1.3
Switch(config)#tacacs-server key test
Switch(config)#authentication line vty login tacacs
42.4 TACACS+ Troubleshooting
In configuring and using TACACS+, the TACACS+ may fail to authentication due to reasons
such as physical connection failure or wrong configurations. The user should ensure the
following:
First good condition of the TACACS+ server physical connection.
Second all interface and link protocols are in the UP state (use “show interface” command).
Then ensure the TACACS+ key configured on the switch is in accordance with the one
configured on TACACS+ server.
Finally ensure to connect to the correct TACACS+ server.