3Com 4210 9-Port Configuration Manual page 328

1) A user sends a login request to the switch acting as a TACACS client, which then sends an
authentication start request to the TACACS server.
2) The TACACS server returns an authentication response, asking for the username. Upon receiving
the response, the TACACS client requests the user for the username.
3) After receiving the username from the user, the TACACS client sends an authentication
continuance message carrying the username.
4) The TACACS server returns an authentication response, asking for the password. Upon receiving
the response, the TACACS client requests the user for the login password.
5) After receiving the password, the TACACS client sends an authentication continuance message
carrying the password to the TACACS server.
6) The TACACS server returns an authentication response, indicating that the user has passed the
authentication.
7) The TACACS client sends a user authorization request to the TACACS server.
8) The TACACS server returns an authorization response, indicating that the user has passed the
authorization.
9) After receiving the response indicating an authorization success, the TACACS client pushes the
configuration interface of the switch to the user.
10) The TACACS client sends an accounting start request to the TACACS server.
11) The TACACS server returns an accounting response, indicating that it has received the accounting
start request.
12) The user logs out; the TACACS client sends an accounting stop request to the TACACS server.
13) The TACACS server returns an accounting response, indicating that it has received the accounting
stop request.
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