5-24
TACACS+ Authentication
How Authentication Operates
How Authentication Operates
General Authentication Process Using a TACACS+
Server
Authentication through a TACACS+ server operates generally as described
below. For specific operating details, refer to the documentation you received
with your TACACS+ server application.
Figure 5-10. Using a TACACS+ Server for Authentication
Using figure 5-10, above, after either switch detects an operator’s logon
request from a remote or directly connected terminal, the following events
occur:
1. The switch queries the first-choice TACACS+ server for authentication
of the request.
• If the switch does not receive a response from the first-choice
TACACS+ server, it attempts to query a secondary server. If the
switch does not receive a response from any TACACS+ server,
then it uses its own local username/password pairs to authenti-
cate the logon request. (See “Local Authentication Process” on
page 5-25.)
• If a TACACS+ server recognizes the switch, it forwards a user-
name prompt to the requesting terminal via the switch.
2. When the requesting terminal responds to the prompt with a username,
the switch forwards it to the TACACS+ server.
HP Switch Configured
for TACACS+ Operation
First-Choice
TACACS+ Server
B
HP Switch
Configured for
TACACS+ Operation
Terminal “A” Directly Accessing This
Switch Via Switch’s Console Port
Terminal “B” Remotely
Accessing This Switch Via Telnet
A
Second-Choice
TACACS+ Server
(Optional)
Third-Choice
TACACS+ Server
(Optional)
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