A
UTHENTICATION
C
OMMANDS
4-93Authentication Sequence

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
Command Function Mode Page
authentication login Defines logon authentication method and
precedence
GC 3-93