4-13
TACACS+ Authentication
Configuring TACACS+ on the Switch
Table 4-1. AAA Authentication Parameters
As shown in the next table, login and enable access is always available locally
through a direct terminal connection to the switch’s console port. However,
for Telnet access, you can configure TACACS+ to deny access if a TACACS+
server goes down or otherwise becomes unavailable to the switch.
Name Default Range Function
console, Telnet,
SSH, web ,
port-access,
mac-based*,
web-based*
n/a n/a Specifies the access method used when authenticating. TACACS+
authentication only uses the console, Telnet or SSH access methods.
* 2510-48 only
enable
- or -
login
n/a n/a Specifies the privilege level to be configured.
enable: Specifies the "enable" (Manager/read-write) privilege level for the
access method being configured.
login: Specifies the "login" (Operator/read-only) privilege level for the
access method being configured.
local
- or -
tacacs
- or -
radius
local n/a Specifies the primary method of authentication for the access method being
configured.
local: Use the username/password pair configured locally in the switch for
the privilege level being configured
tacacs: Use a TACACS+ server.
radius: Use a RADIUS server.
local
- or -
none
- or -
authorized
none n/a Specifies the secondary (backup) method for the access method being config-
ured.
local: The username/password pair configured locally in the switch for the
privilege level being configured. Cannot be used if the primary
authentication is local.
none: No secondary type of authentication for the specified
method/privilege path. (Available only if the primary method of
authentication for the access being configured is local.)
authorized: Allow access without authentication.
Note: If you do not specify this parameter in the command line, the switch
automatically assigns the secondary method as follows:
• If the primary method is
tacacs, the secondary method is local.
• If the primary method is local, the secondary method is none.
login privilege-
mode
privilege-
mode
disabled
n/a Specifies that the switch will respect the authentication server’s privilege level.
The
login privilege-mode option enables TACACS+ for a single login. The
authorized privilege level (Operator or Manager) is returned to the switch by
the TACACS+ server.
num-attempts 3 1 - 10 In a given session, specifies how many tries at entering the correct username/
password pair are allowed before access is denied and the session terminated.
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