Chapter 7
| Authentication Commands
Authentication Sequence
– 168 –
Authentication Sequence
Three authentication methods can be specified to authenticate users logging into
the system for management access. The commands in this section can be used to
define the authentication method and sequence.
authentication enable This command defines the authentication method and precedence to use when
changing from Exec command mode to Privileged Exec command mode with the
enable command. Use the no form to restore the default.
Syntax
authentication enable {[local] [radius] [tacacs]}
no authentication enable
local - Use local password only.
radius - Use RADIUS server password only.
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
enable radius tacacs local,” the user name and password on the RADIUS
server is verified first. If the RADIUS server is not available, then authentication
Table 34: Authentication Sequence Commands
Command Function Mode
authentication enable Defines the authentication method and precedence for
command mode change
GC
authentication login Defines logon authentication method and precedence GC
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