System information

Authentication Commands
4-63
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.
Example
Related Commands
username - for setting the local user names and passwords (4-24)
RADIUS Client
Remote Authentication Dial-in User Service (RADIUS) is a logon authentication
protocol that uses software running on a central server to control access to
RADIUS-aware devices on the network. An authentication server contains a
database of multiple user name/password pairs with associated privilege levels for
each user or group that require management access to a switch.
Console(config)#authentication login radius
Console(config)#
Command Function Mode Page
radius-server host Specifies the RADIUS server GC 4-64
radius-server port Sets the RADIUS server network port GC 4-64
radius-server key Sets the RADIUS encryption key GC 4-65
radius-server retransmit Sets the number of retries GC 4-65
radius-server timeout Sets the interval between sending authentication
requests
GC 4-66
show radius-server Shows the current RADIUS settings PE 4-66