Chapter 8
| Authentication Commands
Authentication Sequence
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is attempted on the TACACS+ server. If the TACACS+ server is not available, the
local user name and password is checked.
Example
Console(config)#authentication enable radius
Console(config)#
Related Commands
enable password - sets the password for changing command modes (244)
authentication login This command defines the login authentication method and precedence. Use the
no form to restore the default.
Syntax
authentication login {[local] [radius] [tacacs]}
no authentication login
local - Use local password.
radius - Use RADIUS server password.
tacacs - Use TACACS server password.
Default Setting
Local
Command Mode
Global Configuration
Command Usage
◆ RADIUS uses UDP while TACACS+ uses TCP. UDP only offers best effort delivery,
while TCP offers a connection-oriented transport. Also, note that RADIUS
encrypts only the password in the access-request packet from the client to the
server, while TACACS+ encrypts the entire body of the packet.
◆ RADIUS and TACACS+ logon authentication assigns a specific privilege level for
each user name and password pair. The user name, password, and privilege
level must be configured on the authentication server.
◆ You can specify three authentication methods in a single command to indicate
the authentication sequence. For example, if you enter “authentication login
radius tacacs local,” the user name and password on the RADIUS server is
verified first. If the RADIUS server is not available, then authentication is
attempted on the TACACS+ server. If the TACACS+ server is not available, the
local user name and password is checked.
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