Brocade BigIron RX Series Configuration Guide - Manual (Page 154)

76 BigIron RX Series Configuration Guide
53-1002484-04
Configuring TACACS and TACACS+ security
3
TACACS and TACACS+ authentication, authorization,
and accounting
When you configure a device to use a TACACS and TACACS+ server for authentication, the device
prompts users who are trying to access the CLI for a user name and password, then verifies the
password with the TACACS and TACACS+ server.
If you are using TACACS+, Brocade recommends that you also configure authorization, in which the
device consults a TACACS+ server to determine which management privilege level (and which
associated set of commands) an authenticated user is allowed to use. You can also optionally
configure accounting, which causes the device to log information on the TACACS+ server when
specified events occur on the device.
NOTE
By default, a user logging into the device through Telnet or SSH would first enter the User EXEC level.
The user can enter the enable command to get to the Privileged EXEC level.
A user that is successfully authenticated can be automatically placed at the Privileged EXEC level
after login. Refer to
“Entering privileged EXEC mode after a Telnet or SSH login” on page 84.
TACACS authentication
NOTE
Also, multiple challenges are supported for TACACS+ login authentication.
When TACACS authentication takes place, the following events occur.
1. A user attempts to gain access to the device by doing one of the following:
• Logging into the device using Telnet, SSH, or the Web management interface
• Entering the Privileged EXEC level or CONFIG level of the CLI
2. The user is prompted for a username and password.
3. The user enters a username and password.
4. The device sends a request containing the username and password to the TACACS server.
5. The username and password are validated in the TACACS server’s database.
6. If the password is valid, the user is authenticated.
TACACS+ authentication
When TACACS+ authentication takes place, the following events occur.
1. A user attempts to gain access to the device by doing one of the following:
• Logging into the device using Telnet, SSH, or the Web management interface
• Entering the Privileged EXEC level or CONFIG level of the CLI
2. The user is prompted for a username.
3. The user enters a username.
4. The device obtains a password prompt from a TACACS+ server.